AKARI 1.0.39
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1 | +Notes for AKARI project | |
2 | + | |
3 | +AKARI is Access Keeping And Regulating Instrument for Linux 2.6 and later | |
4 | +kernels. | |
5 | + | |
6 | +You can use AKARI for analyzing your system's behavior (i.e. reports which | |
7 | +application accesses which resources like strace command does) and optionally | |
8 | +restricting your system's behavior (i.e. controls which application can | |
9 | +access which resources like TOMOYO/AppArmor does). | |
10 | + | |
11 | +AKARI is forked from TOMOYO 1.8 and made as a LKM (loadable kernel module) | |
12 | +so that you don't need to replace your kernels installed in your system. | |
13 | + | |
14 | +This patch is released under the GPLv2. | |
15 | + | |
16 | +Project URL: https://akari.osdn.jp/ | |
17 | + | |
18 | +ChangeLog: | |
19 | + | |
20 | +Version 1.0 2010/10/10 First release. | |
21 | + | |
22 | +Version 1.0.1 2010/10/18 Minor update release. | |
23 | + | |
24 | + Synchronize with TOMOYO revision 4069. | |
25 | + | |
26 | + Fix off-by-two in ccs_check_unix_address(). | |
27 | + | |
28 | + Implement post accept() LSM hook. | |
29 | + | |
30 | +Version 1.0.2 2010/10/25 Minor update release. | |
31 | + | |
32 | + Synchronize with TOMOYO revision 4090. | |
33 | + | |
34 | + Add getattr() and readdir() checks. | |
35 | + | |
36 | + Use "YYYY/MM/DD hh:mm:ss" format for /proc/ccs/ interface. | |
37 | + | |
38 | + Do not automatically add / for umount(). | |
39 | + | |
40 | +Version 1.0.3 2010/11/01 Minor update release. | |
41 | + | |
42 | + Synchronize with TOMOYO revision 4104. | |
43 | + | |
44 | + Fix pathname handling in ccs_unix_entry(). | |
45 | + | |
46 | +Version 1.0.4 2010/11/11 Minor update release. | |
47 | + | |
48 | + Synchronize with TOMOYO 1.8.0 release. | |
49 | + | |
50 | + Add sysctl() check for 2.6.21 to 2.6.32 kernels. | |
51 | + | |
52 | + Fix double new_decode_dev() bug for mknod(). | |
53 | + | |
54 | + Fix keyword typo. | |
55 | + | |
56 | + Fix build failure on some kernels. | |
57 | + | |
58 | + Changed pathname prefix priority. | |
59 | + | |
60 | + Use hash table for faster scan. | |
61 | + | |
62 | + Updated function comments. | |
63 | + | |
64 | +Version 1.0.5 2010/11/22 Minor update release. | |
65 | + | |
66 | + Make ccs_domain_info/ccs_flags inheritable for 2.6.29 and later kernels. | |
67 | + | |
68 | +Version 1.0.6 2010/12/31 Minor update release. | |
69 | + | |
70 | + Synchronize with TOMOYO revision 4280. | |
71 | + | |
72 | + Use same interface for audit logs. | |
73 | + | |
74 | + Split ccs_null_security into ccs_default_security and ccs_oom_security. | |
75 | + | |
76 | +Version 1.0.7 2011/01/21 Minor update release. | |
77 | + | |
78 | + Synchronize with TOMOYO revision 4400. | |
79 | + | |
80 | + Use filesystem name for unnamed devices when vfsmount is missing. | |
81 | + | |
82 | +Version 1.0.8 2011/02/07 Minor update release. | |
83 | + | |
84 | + Synchronize with TOMOYO revision 4545. | |
85 | + | |
86 | + Fix infinite loop bug when reading /proc/ccs/audit or /proc/ccs/query . | |
87 | + | |
88 | +Version 1.0.9 2011/02/14 Minor update release. | |
89 | + | |
90 | + Fix missing permission check for interpreters in 2.6.30 and later kernels. | |
91 | + | |
92 | +Version 1.0.10 2011/02/15 Minor update release. | |
93 | + | |
94 | + Fix missing permission check for interpreters in 2.6.23 and earlier kernels. | |
95 | + | |
96 | + Fix wrong execute permission check and domain transition in 2.6.28 and earlier kernels. | |
97 | + | |
98 | +Version 1.0.11 2010/04/01 Minor update release. | |
99 | + | |
100 | + Synchronize with TOMOYO 1.8.1 release. | |
101 | + | |
102 | + Run garbage collector without waiting for /proc/ccs/ users. | |
103 | + | |
104 | + Support built-in policy configuration. | |
105 | + | |
106 | + Remove /proc/ccs/meminfo interface. | |
107 | + | |
108 | + Pack policy when printing via /proc/ccs/ interface. | |
109 | + | |
110 | + Fix conditional policy parsing. | |
111 | + | |
112 | + Serialize updating profile's comment line. | |
113 | + | |
114 | +Version 1.0.12 2011/04/11 Minor update release. | |
115 | + | |
116 | + Synchronize with TOMOYO revision 4874. | |
117 | + | |
118 | + Fix fcntl(F_SETFL, O_APPEND) handling. | |
119 | + | |
120 | +Version 1.0.13 2011/05/05 Minor update release. | |
121 | + | |
122 | + Synchronize with TOMOYO revision 4963. | |
123 | + | |
124 | + Fix wrong profile number in audit logs for "misc env" permission. | |
125 | + | |
126 | +Version 1.0.14 2011/05/11 Minor update release. | |
127 | + | |
128 | + Synchronize with TOMOYO revision 4978. | |
129 | + | |
130 | + Fix wrong domainname validation. | |
131 | + | |
132 | +Version 1.0.15 2011/06/20 Minor update release. | |
133 | + | |
134 | + Synchronize with TOMOYO 1.8.2 release. | |
135 | + | |
136 | + Add policy namespace support. | |
137 | + | |
138 | +Version 1.0.16 2011/07/07 Minor update release. | |
139 | + | |
140 | + Synchronize with TOMOYO revision 5235. | |
141 | + | |
142 | + Remove /proc/ccs/.domain_status interface. | |
143 | + | |
144 | +Version 1.0.17 2011/07/13 Minor update release. | |
145 | + | |
146 | + Synchronize with TOMOYO revision 5266. | |
147 | + | |
148 | + Fix /proc/ccs/stat parser. | |
149 | + | |
150 | + Accept "::" notation for IPv6 address. | |
151 | + | |
152 | +Version 1.0.18 2011/09/03 Minor update release. | |
153 | + | |
154 | + Synchronize with TOMOYO revision 5401. | |
155 | + | |
156 | + Avoid race when retrying "file execute" permission check. | |
157 | + | |
158 | + Remove unneeded daemonize(). | |
159 | + | |
160 | + Fix load failure with !CONFIG_SMP && !CONFIG_DEBUG_SPINLOCK kernels. | |
161 | + | |
162 | +Version 1.0.19 2011/09/15 Minor update release. | |
163 | + | |
164 | + Use akari/config.h for choosing build options. | |
165 | + | |
166 | + Fix build error on CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER=y case. | |
167 | + | |
168 | + Use lookup_mnt() rather than __put_namespace(). (2.6.0 to 2.6.2 kernels) | |
169 | + | |
170 | + Fix unbalanced spin_lock()/spin_unlock() pair in lsm_pin(). | |
171 | + (2.6.15 to 2.6.35 kernels) | |
172 | + | |
173 | + Fix "struct task_struct" leaks of tasks created before loading akari.ko . | |
174 | + (2.6.28 and earlier kernels) | |
175 | + | |
176 | + Use "struct task_struct"->pids[PIDTYPE_PID].pid instead of | |
177 | + "struct task_struct" for associating with per "struct task_struct" variables | |
178 | + (i.e. "struct ccs_security") in order to reduce amount of dead memory | |
179 | + waiting for garbage collection. (2.6.29 and later kernels) | |
180 | + | |
181 | + Add akari_test.ko for checking whether akari.ko seems to work or not. | |
182 | + | |
183 | + Add SH and ARM architectures support. (Needs more testing.) | |
184 | + | |
185 | +Version 1.0.20 2011/09/29 Minor update release. | |
186 | + | |
187 | + Synchronize with TOMOYO 1.8.3 release. | |
188 | + | |
189 | + Allow specifying domain transition preference. | |
190 | + | |
191 | + Simplify garbage collector. | |
192 | + | |
193 | +Version 1.0.21 2011/10/25 Minor update release. | |
194 | + | |
195 | + Synchronize with TOMOYO revision 5569. | |
196 | + | |
197 | + Fix incomplete read after seek. | |
198 | + | |
199 | + Use query id for reaching target process's domain policy. | |
200 | + | |
201 | + Fix quota counting. | |
202 | + | |
203 | +Version 1.0.22 2011/11/11 Minor update release. | |
204 | + | |
205 | + Synchronize with TOMOYO revision 5625. | |
206 | + | |
207 | + Optimize for object's size. | |
208 | + | |
209 | +Version 1.0.23 2011/11/18 Minor update release. | |
210 | + | |
211 | + Synchronize with TOMOYO revision 5646. | |
212 | + | |
213 | + Fix kernel config mapping error. | |
214 | + | |
215 | +Version 1.0.24 2011/12/13 Minor update release. | |
216 | + | |
217 | + Synchronize with TOMOYO revision 5711. | |
218 | + | |
219 | + Follow __d_path() behavior change. (Only 2.6.36 and later) | |
220 | + | |
221 | +Version 1.0.25 2012/02/29 Minor update release. | |
222 | + | |
223 | + Synchronize with TOMOYO revision 5893. | |
224 | + | |
225 | + Follow UMH_WAIT_PROC constant renumbering. | |
226 | + | |
227 | + Fix mount flags checking order. | |
228 | + | |
229 | +Version 1.0.26 2012/04/01 Minor update release. | |
230 | + | |
231 | + Synchronize with TOMOYO revision 5973. | |
232 | + | |
233 | + Return appropriate value to poll(). | |
234 | + | |
235 | +Version 1.0.27 2012/05/05 Minor update release. | |
236 | + | |
237 | + Synchronize with TOMOYO revision 6035. | |
238 | + | |
239 | + Readd RHEL_MINOR/AX_MINOR checks. | |
240 | + | |
241 | + Accept manager programs which do not start with / . | |
242 | + | |
243 | +Version 1.0.28 2012/10/20 Security update release. | |
244 | + | |
245 | + Fix kernel panic caused by double kfree() bug when "struct ccs_execve" | |
246 | + pointer was by error duplicated at __ccs_alloc_task_security(). | |
247 | + This bug affects only 2.6.28 and earlier kernels. | |
248 | + | |
249 | +Version 1.0.29 2012/11/04 Minor update release. | |
250 | + | |
251 | + Use dummy pointer as needed in order to make sure that security_bprm_free() | |
252 | + (which is used for making the caller of do_execve() return to previous | |
253 | + domain when do_execve() failed after domain transition) is always called. | |
254 | + Without this fix, domain transition history on 2.6.28 and earlier kernels | |
255 | + becomes inaccurate. | |
256 | + | |
257 | +Version 1.0.30 2013/02/14 Minor update release. | |
258 | + | |
259 | + Commit a2a8474c "exec: do not sleep in TASK_TRACED under ->cred_guard_mutex" | |
260 | + moved "current->in_execve = 1;" from before prepare_bprm_creds() to after | |
261 | + prepare_bprm_creds(). It turned out that, as an unexpected bonus, we can use | |
262 | + security_prepare_creds() as a hook for emulating security_bprm_free() hook. | |
263 | + | |
264 | + I updated the logic for security_bprm_free() emulation, and now AKARI should | |
265 | + be able to coexist with other AKARI-like LKM-based LSM implementations (e.g. | |
266 | + CaitSith) on all kernel versions other than 2.6.29 and 2.6.30. | |
267 | + | |
268 | +Version 1.0.31 2015/01/12 Minor update release. | |
269 | + | |
270 | + Synchronize with TOMOYO revision 6373. | |
271 | + | |
272 | + Fix missing chmod(-1) check in Linux 3.1 and later kernels. | |
273 | + | |
274 | + Fix potentially using bogus attributes when stat() fails. | |
275 | + | |
276 | +Version 1.0.32 2015/04/08 Minor update release. | |
277 | + | |
278 | + Synchronize with TOMOYO revision 6388. | |
279 | + | |
280 | + Fix incorrect readdir() permission check. | |
281 | + | |
282 | +Version 1.0.33 2015/04/21 Minor update release. | |
283 | + | |
284 | + Synchronize with TOMOYO revision 6407. | |
285 | + | |
286 | + Fix incorrect retry request check. | |
287 | + | |
288 | +Version 1.0.34 2015/05/05 Minor update release. | |
289 | + | |
290 | + Synchronize with TOMOYO 1.8.4 release. | |
291 | + | |
292 | + Support multiple use_group entries. | |
293 | + | |
294 | +Version 1.0.35 2015/11/11 Minor update release. | |
295 | + | |
296 | + Synchronize with TOMOYO 1.8.5 release. | |
297 | + | |
298 | + Use memory allocation flags used by TOMOYO 2.x. | |
299 | + | |
300 | + Limit wildcard recursion depth. | |
301 | + | |
302 | +Version 1.0.36 2017/02/20 Minor update release. | |
303 | + | |
304 | + Synchronize with TOMOYO revision 6553. | |
305 | + | |
306 | + The bug fixed in TOMOYO's GC does not affect AKARI because | |
307 | + AKARI always uses CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY. | |
308 | + | |
309 | +Version 1.0.37 2017/09/17 Minor update release. | |
310 | + | |
311 | + Use smp_rmb() when waiting for hook readiness. | |
312 | + | |
313 | +Version 1.0.38 2018/04/01 Minor update release. | |
314 | + | |
315 | + Synchronize with TOMOYO revision 6638. | |
316 | + | |
317 | + Due to incorrect probe_kernel_write() usage, previously registered LSM | |
318 | + hook (if any) was by error overwritten by this hook. This bug affects | |
319 | + only 4.12 and later kernels. | |
320 | + | |
321 | +Version 1.0.39 2019/08/20 Minor update release. | |
322 | + | |
323 | + Synchronize with TOMOYO 1.8.6 release. | |
324 | + | |
325 | + Change pathname calculation for read-only filesystems. | |
326 | + | |
327 | + Reject move_mount() system call for now. | |
328 | + | |
329 | + Don't check open/getattr permission on sockets. |
@@ -0,0 +1,943 @@ | ||
1 | +/* | |
2 | + * include/linux/ccsecurity.h | |
3 | + * | |
4 | + * Copyright (C) 2005-2012 NTT DATA CORPORATION | |
5 | + * | |
6 | + * Version: 1.8.6 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#ifndef _LINUX_CCSECURITY_H | |
10 | +#define _LINUX_CCSECURITY_H | |
11 | + | |
12 | +#include <linux/version.h> | |
13 | + | |
14 | +#ifndef __user | |
15 | +#define __user | |
16 | +#endif | |
17 | + | |
18 | +struct nameidata; | |
19 | +struct path; | |
20 | +struct dentry; | |
21 | +struct vfsmount; | |
22 | +struct linux_binprm; | |
23 | +struct pt_regs; | |
24 | +struct file; | |
25 | +struct ctl_table; | |
26 | +struct socket; | |
27 | +struct sockaddr; | |
28 | +struct sock; | |
29 | +struct sk_buff; | |
30 | +struct msghdr; | |
31 | +struct pid_namespace; | |
32 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0) | |
33 | +int search_binary_handler(struct linux_binprm *bprm); | |
34 | +#else | |
35 | +int search_binary_handler(struct linux_binprm *bprm, struct pt_regs *regs); | |
36 | +#endif | |
37 | + | |
38 | +#ifdef CONFIG_CCSECURITY | |
39 | + | |
40 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) && LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0) | |
41 | +/* Obtain prototype of __d_path(). */ | |
42 | +#include <linux/dcache.h> | |
43 | +#endif | |
44 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
45 | +/* Obtain definition of kuid_t and kgid_t. */ | |
46 | +#include <linux/uidgid.h> | |
47 | +#endif | |
48 | + | |
49 | +/* For exporting variables and functions. */ | |
50 | +struct ccsecurity_exports { | |
51 | + void (*load_policy) (const char *filename); | |
52 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0) | |
53 | + char * (*d_absolute_path) (const struct path *, char *, int); | |
54 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) | |
55 | + typeof(__d_path) (*__d_path); | |
56 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) | |
57 | + spinlock_t *vfsmount_lock; | |
58 | +#endif | |
59 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
60 | + struct task_struct * (*find_task_by_vpid) (pid_t nr); | |
61 | + struct task_struct * (*find_task_by_pid_ns) (pid_t nr, | |
62 | + struct pid_namespace *ns); | |
63 | +#endif | |
64 | +}; | |
65 | + | |
66 | +/* For doing access control. */ | |
67 | +struct ccsecurity_operations { | |
68 | + void (*check_profile) (void); | |
69 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) | |
70 | + int (*chroot_permission) (const struct path *path); | |
71 | + int (*pivot_root_permission) (const struct path *old_path, | |
72 | + const struct path *new_path); | |
73 | + int (*mount_permission) (const char *dev_name, const struct path *path, | |
74 | + const char *type, unsigned long flags, | |
75 | + void *data_page); | |
76 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0) | |
77 | + int (*move_mount_permission) (const struct path *from_path, | |
78 | + const struct path *to_path); | |
79 | +#endif | |
80 | +#else | |
81 | + int (*chroot_permission) (struct nameidata *nd); | |
82 | + int (*pivot_root_permission) (struct nameidata *old_nd, | |
83 | + struct nameidata *new_nd); | |
84 | + int (*mount_permission) (const char *dev_name, struct nameidata *nd, | |
85 | + const char *type, unsigned long flags, | |
86 | + void *data_page); | |
87 | +#endif | |
88 | + int (*umount_permission) (struct vfsmount *mnt, int flags); | |
89 | + _Bool (*lport_reserved) (const u16 port); | |
90 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 32) | |
91 | + void (*save_open_mode) (int mode); | |
92 | + void (*clear_open_mode) (void); | |
93 | + int (*open_permission) (struct dentry *dentry, struct vfsmount *mnt, | |
94 | + const int flag); | |
95 | +#else | |
96 | + int (*open_permission) (struct file *file); | |
97 | +#endif | |
98 | + int (*ptrace_permission) (long request, long pid); | |
99 | + int (*ioctl_permission) (struct file *filp, unsigned int cmd, | |
100 | + unsigned long arg); | |
101 | + int (*parse_table) (int __user *name, int nlen, void __user *oldval, | |
102 | + void __user *newval, struct ctl_table *table); | |
103 | + _Bool (*capable) (const u8 operation); | |
104 | + int (*mknod_permission) (struct dentry *dentry, struct vfsmount *mnt, | |
105 | + unsigned int mode, unsigned int dev); | |
106 | + int (*mkdir_permission) (struct dentry *dentry, struct vfsmount *mnt, | |
107 | + unsigned int mode); | |
108 | + int (*rmdir_permission) (struct dentry *dentry, struct vfsmount *mnt); | |
109 | + int (*unlink_permission) (struct dentry *dentry, struct vfsmount *mnt); | |
110 | + int (*symlink_permission) (struct dentry *dentry, struct vfsmount *mnt, | |
111 | + const char *from); | |
112 | + int (*truncate_permission) (struct dentry *dentry, | |
113 | + struct vfsmount *mnt); | |
114 | + int (*rename_permission) (struct dentry *old_dentry, | |
115 | + struct dentry *new_dentry, | |
116 | + struct vfsmount *mnt); | |
117 | + int (*link_permission) (struct dentry *old_dentry, | |
118 | + struct dentry *new_dentry, | |
119 | + struct vfsmount *mnt); | |
120 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30) | |
121 | + int (*open_exec_permission) (struct dentry *dentry, | |
122 | + struct vfsmount *mnt); | |
123 | + int (*uselib_permission) (struct dentry *dentry, struct vfsmount *mnt); | |
124 | +#endif | |
125 | + int (*fcntl_permission) (struct file *file, unsigned int cmd, | |
126 | + unsigned long arg); | |
127 | + int (*kill_permission) (pid_t pid, int sig); | |
128 | + int (*tgkill_permission) (pid_t tgid, pid_t pid, int sig); | |
129 | + int (*tkill_permission) (pid_t pid, int sig); | |
130 | + int (*socket_create_permission) (int family, int type, int protocol); | |
131 | + int (*socket_listen_permission) (struct socket *sock); | |
132 | + int (*socket_connect_permission) (struct socket *sock, | |
133 | + struct sockaddr *addr, int addr_len); | |
134 | + int (*socket_bind_permission) (struct socket *sock, | |
135 | + struct sockaddr *addr, int addr_len); | |
136 | + int (*socket_post_accept_permission) (struct socket *sock, | |
137 | + struct socket *newsock); | |
138 | + int (*socket_sendmsg_permission) (struct socket *sock, | |
139 | + struct msghdr *msg, int size); | |
140 | + int (*socket_post_recvmsg_permission) (struct sock *sk, | |
141 | + struct sk_buff *skb, int flags); | |
142 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
143 | + int (*chown_permission) (struct dentry *dentry, struct vfsmount *mnt, | |
144 | + kuid_t user, kgid_t group); | |
145 | +#else | |
146 | + int (*chown_permission) (struct dentry *dentry, struct vfsmount *mnt, | |
147 | + uid_t user, gid_t group); | |
148 | +#endif | |
149 | + int (*chmod_permission) (struct dentry *dentry, struct vfsmount *mnt, | |
150 | + mode_t mode); | |
151 | + int (*getattr_permission) (struct vfsmount *mnt, | |
152 | + struct dentry *dentry); | |
153 | + int (*sigqueue_permission) (pid_t pid, int sig); | |
154 | + int (*tgsigqueue_permission) (pid_t tgid, pid_t pid, int sig); | |
155 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0) | |
156 | + int (*search_binary_handler) (struct linux_binprm *bprm); | |
157 | +#else | |
158 | + int (*search_binary_handler) (struct linux_binprm *bprm, | |
159 | + struct pt_regs *regs); | |
160 | +#endif | |
161 | +#ifdef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
162 | + int (*alloc_task_security) (const struct task_struct *task); | |
163 | + void (*free_task_security) (const struct task_struct *task); | |
164 | +#endif | |
165 | + _Bool disabled; | |
166 | +}; | |
167 | + | |
168 | +extern struct ccsecurity_operations ccsecurity_ops; | |
169 | + | |
170 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) | |
171 | + | |
172 | +static inline int ccs_chroot_permission(const struct path *path) | |
173 | +{ | |
174 | + int (*func) (const struct path *) = ccsecurity_ops.chroot_permission; | |
175 | + return func ? func(path) : 0; | |
176 | +} | |
177 | + | |
178 | +static inline int ccs_pivot_root_permission(const struct path *old_path, | |
179 | + const struct path *new_path) | |
180 | +{ | |
181 | + int (*func) (const struct path *, const struct path *) | |
182 | + = ccsecurity_ops.pivot_root_permission; | |
183 | + return func ? func(old_path, new_path) : 0; | |
184 | +} | |
185 | + | |
186 | +static inline int ccs_mount_permission(const char *dev_name, | |
187 | + const struct path *path, | |
188 | + const char *type, unsigned long flags, | |
189 | + void *data_page) | |
190 | +{ | |
191 | + int (*func) (const char *, const struct path *, const char *, | |
192 | + unsigned long, void *) = ccsecurity_ops.mount_permission; | |
193 | + return func ? func(dev_name, path, type, flags, data_page) : 0; | |
194 | +} | |
195 | + | |
196 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0) | |
197 | +static inline int ccs_move_mount_permission(const struct path *from_path, | |
198 | + const struct path *to_path) | |
199 | +{ | |
200 | + int (*func) (const struct path *, const struct path *) = | |
201 | + ccsecurity_ops.move_mount_permission; | |
202 | + return func ? func(from_path, to_path) : 0; | |
203 | +} | |
204 | +#endif | |
205 | + | |
206 | +#else | |
207 | + | |
208 | +static inline int ccs_chroot_permission(struct nameidata *nd) | |
209 | +{ | |
210 | + int (*func) (struct nameidata *) = ccsecurity_ops.chroot_permission; | |
211 | + return func ? func(nd) : 0; | |
212 | +} | |
213 | + | |
214 | +static inline int ccs_pivot_root_permission(struct nameidata *old_nd, | |
215 | + struct nameidata *new_nd) | |
216 | +{ | |
217 | + int (*func) (struct nameidata *, struct nameidata *) | |
218 | + = ccsecurity_ops.pivot_root_permission; | |
219 | + return func ? func(old_nd, new_nd) : 0; | |
220 | +} | |
221 | + | |
222 | +static inline int ccs_mount_permission(const char *dev_name, | |
223 | + struct nameidata *nd, const char *type, | |
224 | + unsigned long flags, void *data_page) | |
225 | +{ | |
226 | + int (*func) (const char *, struct nameidata *, const char *, | |
227 | + unsigned long, void *) = ccsecurity_ops.mount_permission; | |
228 | + return func ? func(dev_name, nd, type, flags, data_page) : 0; | |
229 | +} | |
230 | + | |
231 | +#endif | |
232 | + | |
233 | +static inline int ccs_umount_permission(struct vfsmount *mnt, int flags) | |
234 | +{ | |
235 | + int (*func) (struct vfsmount *, int) | |
236 | + = ccsecurity_ops.umount_permission; | |
237 | + return func ? func(mnt, flags) : 0; | |
238 | +} | |
239 | + | |
240 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 32) | |
241 | + | |
242 | +static inline void ccs_save_open_mode(int mode) | |
243 | +{ | |
244 | + void (*func) (int) = ccsecurity_ops.save_open_mode; | |
245 | + if (func) | |
246 | + func(mode); | |
247 | +} | |
248 | + | |
249 | +static inline void ccs_clear_open_mode(void) | |
250 | +{ | |
251 | + void (*func) (void) = ccsecurity_ops.clear_open_mode; | |
252 | + if (func) | |
253 | + func(); | |
254 | +} | |
255 | + | |
256 | +static inline int ccs_open_permission(struct dentry *dentry, | |
257 | + struct vfsmount *mnt, const int flag) | |
258 | +{ | |
259 | + int (*func) (struct dentry *, struct vfsmount *, const int) | |
260 | + = ccsecurity_ops.open_permission; | |
261 | + return func ? func(dentry, mnt, flag) : 0; | |
262 | +} | |
263 | + | |
264 | +#else | |
265 | + | |
266 | +static inline int ccs_open_permission(struct file *filp) | |
267 | +{ | |
268 | + int (*func) (struct file *) = ccsecurity_ops.open_permission; | |
269 | + return func ? func(filp) : 0; | |
270 | +} | |
271 | + | |
272 | +#endif | |
273 | + | |
274 | +static inline int ccs_fcntl_permission(struct file *file, unsigned int cmd, | |
275 | + unsigned long arg) | |
276 | +{ | |
277 | + int (*func) (struct file *, unsigned int, unsigned long) | |
278 | + = ccsecurity_ops.fcntl_permission; | |
279 | + return func ? func(file, cmd, arg) : 0; | |
280 | +} | |
281 | + | |
282 | +static inline int ccs_ioctl_permission(struct file *filp, unsigned int cmd, | |
283 | + unsigned long arg) | |
284 | +{ | |
285 | + int (*func) (struct file *, unsigned int, unsigned long) | |
286 | + = ccsecurity_ops.ioctl_permission; | |
287 | + return func ? func(filp, cmd, arg) : 0; | |
288 | +} | |
289 | + | |
290 | +static inline int ccs_parse_table(int __user *name, int nlen, | |
291 | + void __user *oldval, void __user *newval, | |
292 | + struct ctl_table *table) | |
293 | +{ | |
294 | + int (*func) (int __user *, int, void __user *, void __user *, | |
295 | + struct ctl_table *) = ccsecurity_ops.parse_table; | |
296 | + return func ? func(name, nlen, oldval, newval, table) : 0; | |
297 | +} | |
298 | + | |
299 | +static inline int ccs_mknod_permission(struct dentry *dentry, | |
300 | + struct vfsmount *mnt, unsigned int mode, | |
301 | + unsigned int dev) | |
302 | +{ | |
303 | + int (*func) (struct dentry *, struct vfsmount *, unsigned int, | |
304 | + unsigned int) = ccsecurity_ops.mknod_permission; | |
305 | + return func ? func(dentry, mnt, mode, dev) : 0; | |
306 | +} | |
307 | + | |
308 | +static inline int ccs_mkdir_permission(struct dentry *dentry, | |
309 | + struct vfsmount *mnt, unsigned int mode) | |
310 | +{ | |
311 | + int (*func) (struct dentry *, struct vfsmount *, unsigned int) | |
312 | + = ccsecurity_ops.mkdir_permission; | |
313 | + return func ? func(dentry, mnt, mode) : 0; | |
314 | +} | |
315 | + | |
316 | +static inline int ccs_rmdir_permission(struct dentry *dentry, | |
317 | + struct vfsmount *mnt) | |
318 | +{ | |
319 | + int (*func) (struct dentry *, struct vfsmount *) | |
320 | + = ccsecurity_ops.rmdir_permission; | |
321 | + return func ? func(dentry, mnt) : 0; | |
322 | +} | |
323 | + | |
324 | +static inline int ccs_unlink_permission(struct dentry *dentry, | |
325 | + struct vfsmount *mnt) | |
326 | +{ | |
327 | + int (*func) (struct dentry *, struct vfsmount *) | |
328 | + = ccsecurity_ops.unlink_permission; | |
329 | + return func ? func(dentry, mnt) : 0; | |
330 | +} | |
331 | + | |
332 | +static inline int ccs_symlink_permission(struct dentry *dentry, | |
333 | + struct vfsmount *mnt, | |
334 | + const char *from) | |
335 | +{ | |
336 | + int (*func) (struct dentry *, struct vfsmount *, const char *) | |
337 | + = ccsecurity_ops.symlink_permission; | |
338 | + return func ? func(dentry, mnt, from) : 0; | |
339 | +} | |
340 | + | |
341 | +static inline int ccs_truncate_permission(struct dentry *dentry, | |
342 | + struct vfsmount *mnt) | |
343 | +{ | |
344 | + int (*func) (struct dentry *, struct vfsmount *) | |
345 | + = ccsecurity_ops.truncate_permission; | |
346 | + return func ? func(dentry, mnt) : 0; | |
347 | +} | |
348 | + | |
349 | +static inline int ccs_rename_permission(struct dentry *old_dentry, | |
350 | + struct dentry *new_dentry, | |
351 | + struct vfsmount *mnt) | |
352 | +{ | |
353 | + int (*func) (struct dentry *, struct dentry *, struct vfsmount *) | |
354 | + = ccsecurity_ops.rename_permission; | |
355 | + return func ? func(old_dentry, new_dentry, mnt) : 0; | |
356 | +} | |
357 | + | |
358 | +static inline int ccs_link_permission(struct dentry *old_dentry, | |
359 | + struct dentry *new_dentry, | |
360 | + struct vfsmount *mnt) | |
361 | +{ | |
362 | + int (*func) (struct dentry *, struct dentry *, struct vfsmount *) | |
363 | + = ccsecurity_ops.link_permission; | |
364 | + return func ? func(old_dentry, new_dentry, mnt) : 0; | |
365 | +} | |
366 | + | |
367 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30) | |
368 | + | |
369 | +static inline int ccs_open_exec_permission(struct dentry *dentry, | |
370 | + struct vfsmount *mnt) | |
371 | +{ | |
372 | + int (*func) (struct dentry *, struct vfsmount *) | |
373 | + = ccsecurity_ops.open_exec_permission; | |
374 | + return func ? func(dentry, mnt) : 0; | |
375 | +} | |
376 | + | |
377 | +static inline int ccs_uselib_permission(struct dentry *dentry, | |
378 | + struct vfsmount *mnt) | |
379 | +{ | |
380 | + int (*func) (struct dentry *, struct vfsmount *) | |
381 | + = ccsecurity_ops.uselib_permission; | |
382 | + return func ? func(dentry, mnt) : 0; | |
383 | +} | |
384 | + | |
385 | +#endif | |
386 | + | |
387 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
388 | + | |
389 | +static inline int ccs_chown_permission(struct dentry *dentry, | |
390 | + struct vfsmount *mnt, kuid_t user, | |
391 | + kgid_t group) | |
392 | +{ | |
393 | + int (*func) (struct dentry *, struct vfsmount *, kuid_t, kgid_t) | |
394 | + = ccsecurity_ops.chown_permission; | |
395 | + return func ? func(dentry, mnt, user, group) : 0; | |
396 | +} | |
397 | + | |
398 | +#else | |
399 | + | |
400 | +static inline int ccs_chown_permission(struct dentry *dentry, | |
401 | + struct vfsmount *mnt, uid_t user, | |
402 | + gid_t group) | |
403 | +{ | |
404 | + int (*func) (struct dentry *, struct vfsmount *, uid_t, gid_t) | |
405 | + = ccsecurity_ops.chown_permission; | |
406 | + return func ? func(dentry, mnt, user, group) : 0; | |
407 | +} | |
408 | + | |
409 | +#endif | |
410 | + | |
411 | +static inline int ccs_chmod_permission(struct dentry *dentry, | |
412 | + struct vfsmount *mnt, mode_t mode) | |
413 | +{ | |
414 | + int (*func) (struct dentry *, struct vfsmount *, mode_t) | |
415 | + = ccsecurity_ops.chmod_permission; | |
416 | + return func ? func(dentry, mnt, mode) : 0; | |
417 | +} | |
418 | + | |
419 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0) | |
420 | + | |
421 | +static inline int ccs_search_binary_handler(struct linux_binprm *bprm) | |
422 | +{ | |
423 | + return ccsecurity_ops.search_binary_handler(bprm); | |
424 | +} | |
425 | + | |
426 | +#else | |
427 | + | |
428 | +static inline int ccs_search_binary_handler(struct linux_binprm *bprm, | |
429 | + struct pt_regs *regs) | |
430 | +{ | |
431 | + return ccsecurity_ops.search_binary_handler(bprm, regs); | |
432 | +} | |
433 | + | |
434 | +#endif | |
435 | + | |
436 | +#else | |
437 | + | |
438 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) | |
439 | + | |
440 | +static inline int ccs_chroot_permission(const struct path *path) | |
441 | +{ | |
442 | + return 0; | |
443 | +} | |
444 | + | |
445 | +static inline int ccs_pivot_root_permission(const struct path *old_path, | |
446 | + const struct path *new_path) | |
447 | +{ | |
448 | + return 0; | |
449 | +} | |
450 | + | |
451 | +static inline int ccs_mount_permission(const char *dev_name, | |
452 | + const struct path *path, | |
453 | + const char *type, unsigned long flags, | |
454 | + void *data_page) | |
455 | +{ | |
456 | + return 0; | |
457 | +} | |
458 | + | |
459 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0) | |
460 | +static inline int ccs_move_mount_permission(const struct path *from_path, | |
461 | + const struct path *to_path) | |
462 | +{ | |
463 | + return 0; | |
464 | +} | |
465 | +#endif | |
466 | + | |
467 | +#else | |
468 | + | |
469 | +static inline int ccs_chroot_permission(struct nameidata *nd) | |
470 | +{ | |
471 | + return 0; | |
472 | +} | |
473 | + | |
474 | +static inline int ccs_pivot_root_permission(struct nameidata *old_nd, | |
475 | + struct nameidata *new_nd) | |
476 | +{ | |
477 | + return 0; | |
478 | +} | |
479 | + | |
480 | +static inline int ccs_mount_permission(const char *dev_name, | |
481 | + struct nameidata *nd, const char *type, | |
482 | + unsigned long flags, void *data_page) | |
483 | +{ | |
484 | + return 0; | |
485 | +} | |
486 | + | |
487 | +#endif | |
488 | + | |
489 | +static inline int ccs_umount_permission(struct vfsmount *mnt, int flags) | |
490 | +{ | |
491 | + return 0; | |
492 | +} | |
493 | + | |
494 | +static inline void ccs_save_open_mode(int mode) | |
495 | +{ | |
496 | +} | |
497 | + | |
498 | +static inline void ccs_clear_open_mode(void) | |
499 | +{ | |
500 | +} | |
501 | + | |
502 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 32) | |
503 | + | |
504 | +static inline int ccs_open_permission(struct dentry *dentry, | |
505 | + struct vfsmount *mnt, const int flag) | |
506 | +{ | |
507 | + return 0; | |
508 | +} | |
509 | + | |
510 | +#else | |
511 | + | |
512 | +static inline int ccs_open_permission(struct file *filp) | |
513 | +{ | |
514 | + return 0; | |
515 | +} | |
516 | + | |
517 | +#endif | |
518 | + | |
519 | +static inline int ccs_ioctl_permission(struct file *filp, unsigned int cmd, | |
520 | + unsigned long arg) | |
521 | +{ | |
522 | + return 0; | |
523 | +} | |
524 | + | |
525 | +static inline int ccs_parse_table(int __user *name, int nlen, | |
526 | + void __user *oldval, void __user *newval, | |
527 | + struct ctl_table *table) | |
528 | +{ | |
529 | + return 0; | |
530 | +} | |
531 | + | |
532 | +static inline int ccs_mknod_permission(struct dentry *dentry, | |
533 | + struct vfsmount *mnt, unsigned int mode, | |
534 | + unsigned int dev) | |
535 | +{ | |
536 | + return 0; | |
537 | +} | |
538 | + | |
539 | +static inline int ccs_mkdir_permission(struct dentry *dentry, | |
540 | + struct vfsmount *mnt, unsigned int mode) | |
541 | +{ | |
542 | + return 0; | |
543 | +} | |
544 | + | |
545 | +static inline int ccs_rmdir_permission(struct dentry *dentry, | |
546 | + struct vfsmount *mnt) | |
547 | +{ | |
548 | + return 0; | |
549 | +} | |
550 | + | |
551 | +static inline int ccs_unlink_permission(struct dentry *dentry, | |
552 | + struct vfsmount *mnt) | |
553 | +{ | |
554 | + return 0; | |
555 | +} | |
556 | + | |
557 | +static inline int ccs_symlink_permission(struct dentry *dentry, | |
558 | + struct vfsmount *mnt, | |
559 | + const char *from) | |
560 | +{ | |
561 | + return 0; | |
562 | +} | |
563 | + | |
564 | +static inline int ccs_truncate_permission(struct dentry *dentry, | |
565 | + struct vfsmount *mnt) | |
566 | +{ | |
567 | + return 0; | |
568 | +} | |
569 | + | |
570 | +static inline int ccs_rename_permission(struct dentry *old_dentry, | |
571 | + struct dentry *new_dentry, | |
572 | + struct vfsmount *mnt) | |
573 | +{ | |
574 | + return 0; | |
575 | +} | |
576 | + | |
577 | +static inline int ccs_link_permission(struct dentry *old_dentry, | |
578 | + struct dentry *new_dentry, | |
579 | + struct vfsmount *mnt) | |
580 | +{ | |
581 | + return 0; | |
582 | +} | |
583 | + | |
584 | +static inline int ccs_open_exec_permission(struct dentry *dentry, | |
585 | + struct vfsmount *mnt) | |
586 | +{ | |
587 | + return 0; | |
588 | +} | |
589 | + | |
590 | +static inline int ccs_uselib_permission(struct dentry *dentry, | |
591 | + struct vfsmount *mnt) | |
592 | +{ | |
593 | + return 0; | |
594 | +} | |
595 | + | |
596 | +static inline int ccs_fcntl_permission(struct file *file, unsigned int cmd, | |
597 | + unsigned long arg) | |
598 | +{ | |
599 | + return 0; | |
600 | +} | |
601 | + | |
602 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
603 | + | |
604 | +static inline int ccs_chown_permission(struct dentry *dentry, | |
605 | + struct vfsmount *mnt, kuid_t user, | |
606 | + kgid_t group) | |
607 | +{ | |
608 | + return 0; | |
609 | +} | |
610 | + | |
611 | +#else | |
612 | + | |
613 | +static inline int ccs_chown_permission(struct dentry *dentry, | |
614 | + struct vfsmount *mnt, uid_t user, | |
615 | + gid_t group) | |
616 | +{ | |
617 | + return 0; | |
618 | +} | |
619 | + | |
620 | +#endif | |
621 | + | |
622 | +static inline int ccs_chmod_permission(struct dentry *dentry, | |
623 | + struct vfsmount *mnt, mode_t mode) | |
624 | +{ | |
625 | + return 0; | |
626 | +} | |
627 | + | |
628 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0) | |
629 | + | |
630 | +static inline int ccs_search_binary_handler(struct linux_binprm *bprm) | |
631 | +{ | |
632 | + return search_binary_handler(bprm); | |
633 | +} | |
634 | + | |
635 | +#else | |
636 | + | |
637 | +static inline int ccs_search_binary_handler(struct linux_binprm *bprm, | |
638 | + struct pt_regs *regs) | |
639 | +{ | |
640 | + return search_binary_handler(bprm, regs); | |
641 | +} | |
642 | + | |
643 | +#endif | |
644 | + | |
645 | +#endif | |
646 | + | |
647 | +#ifdef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
648 | + | |
649 | +static inline int ccs_alloc_task_security(const struct task_struct *task) | |
650 | +{ | |
651 | + int (*func) (const struct task_struct *) | |
652 | + = ccsecurity_ops.alloc_task_security; | |
653 | + return func ? func(task) : 0; | |
654 | +} | |
655 | + | |
656 | +static inline void ccs_free_task_security(const struct task_struct *task) | |
657 | +{ | |
658 | + void (*func) (const struct task_struct *) | |
659 | + = ccsecurity_ops.free_task_security; | |
660 | + if (func) | |
661 | + func(task); | |
662 | +} | |
663 | + | |
664 | +#else | |
665 | + | |
666 | +static inline int ccs_alloc_task_security(const struct task_struct *task) | |
667 | +{ | |
668 | + return 0; | |
669 | +} | |
670 | + | |
671 | +static inline void ccs_free_task_security(const struct task_struct *task) | |
672 | +{ | |
673 | +} | |
674 | + | |
675 | +#endif | |
676 | + | |
677 | +#ifdef CONFIG_CCSECURITY_FILE_GETATTR | |
678 | + | |
679 | +static inline int ccs_getattr_permission(struct vfsmount *mnt, | |
680 | + struct dentry *dentry) | |
681 | +{ | |
682 | + int (*func) (struct vfsmount *, struct dentry *) | |
683 | + = ccsecurity_ops.getattr_permission; | |
684 | + return func ? func(mnt, dentry) : 0; | |
685 | +} | |
686 | + | |
687 | +#else | |
688 | + | |
689 | +static inline int ccs_getattr_permission(struct vfsmount *mnt, | |
690 | + struct dentry *dentry) | |
691 | +{ | |
692 | + return 0; | |
693 | +} | |
694 | + | |
695 | +#endif | |
696 | + | |
697 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
698 | + | |
699 | +static inline int ccs_socket_listen_permission(struct socket *sock) | |
700 | +{ | |
701 | + int (*func) (struct socket *) | |
702 | + = ccsecurity_ops.socket_listen_permission; | |
703 | + return func ? func(sock) : 0; | |
704 | +} | |
705 | + | |
706 | +static inline int ccs_socket_connect_permission(struct socket *sock, | |
707 | + struct sockaddr *addr, | |
708 | + int addr_len) | |
709 | +{ | |
710 | + int (*func) (struct socket *, struct sockaddr *, int) | |
711 | + = ccsecurity_ops.socket_connect_permission; | |
712 | + return func ? func(sock, addr, addr_len) : 0; | |
713 | +} | |
714 | + | |
715 | +static inline int ccs_socket_bind_permission(struct socket *sock, | |
716 | + struct sockaddr *addr, | |
717 | + int addr_len) | |
718 | +{ | |
719 | + int (*func) (struct socket *, struct sockaddr *, int) | |
720 | + = ccsecurity_ops.socket_bind_permission; | |
721 | + return func ? func(sock, addr, addr_len) : 0; | |
722 | +} | |
723 | + | |
724 | +static inline int ccs_socket_post_accept_permission(struct socket *sock, | |
725 | + struct socket *newsock) | |
726 | +{ | |
727 | + int (*func) (struct socket *, struct socket *) | |
728 | + = ccsecurity_ops.socket_post_accept_permission; | |
729 | + return func ? func(sock, newsock) : 0; | |
730 | +} | |
731 | + | |
732 | +static inline int ccs_socket_sendmsg_permission(struct socket *sock, | |
733 | + struct msghdr *msg, | |
734 | + int size) | |
735 | +{ | |
736 | + int (*func) (struct socket *, struct msghdr *, int) | |
737 | + = ccsecurity_ops.socket_sendmsg_permission; | |
738 | + return func ? func(sock, msg, size) : 0; | |
739 | +} | |
740 | + | |
741 | +#else | |
742 | + | |
743 | +static inline int ccs_socket_listen_permission(struct socket *sock) | |
744 | +{ | |
745 | + return 0; | |
746 | +} | |
747 | + | |
748 | +static inline int ccs_socket_connect_permission(struct socket *sock, | |
749 | + struct sockaddr *addr, | |
750 | + int addr_len) | |
751 | +{ | |
752 | + return 0; | |
753 | +} | |
754 | + | |
755 | +static inline int ccs_socket_bind_permission(struct socket *sock, | |
756 | + struct sockaddr *addr, | |
757 | + int addr_len) | |
758 | +{ | |
759 | + return 0; | |
760 | +} | |
761 | + | |
762 | +static inline int ccs_socket_post_accept_permission(struct socket *sock, | |
763 | + struct socket *newsock) | |
764 | +{ | |
765 | + return 0; | |
766 | +} | |
767 | + | |
768 | +static inline int ccs_socket_sendmsg_permission(struct socket *sock, | |
769 | + struct msghdr *msg, | |
770 | + int size) | |
771 | +{ | |
772 | + return 0; | |
773 | +} | |
774 | + | |
775 | +#endif | |
776 | + | |
777 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
778 | + | |
779 | +static inline int ccs_socket_post_recvmsg_permission(struct sock *sk, | |
780 | + struct sk_buff *skb, | |
781 | + int flags) | |
782 | +{ | |
783 | + int (*func) (struct sock *, struct sk_buff *, int) | |
784 | + = ccsecurity_ops.socket_post_recvmsg_permission; | |
785 | + return func ? func(sk, skb, flags) : 0; | |
786 | +} | |
787 | + | |
788 | +#else | |
789 | + | |
790 | +static inline int ccs_socket_post_recvmsg_permission(struct sock *sk, | |
791 | + struct sk_buff *skb, | |
792 | + int flags) | |
793 | +{ | |
794 | + return 0; | |
795 | +} | |
796 | + | |
797 | +#endif | |
798 | + | |
799 | +#ifdef CONFIG_CCSECURITY_PORTRESERVE | |
800 | + | |
801 | +static inline _Bool ccs_lport_reserved(const u16 port) | |
802 | +{ | |
803 | + _Bool (*func) (const u16) = ccsecurity_ops.lport_reserved; | |
804 | + return func ? func(port) : 0; | |
805 | +} | |
806 | + | |
807 | +#else | |
808 | + | |
809 | +static inline _Bool ccs_lport_reserved(const u16 port) | |
810 | +{ | |
811 | + return 0; | |
812 | +} | |
813 | + | |
814 | +#endif | |
815 | + | |
816 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
817 | + | |
818 | +static inline _Bool ccs_capable(const u8 operation) | |
819 | +{ | |
820 | + _Bool (*func) (const u8) = ccsecurity_ops.capable; | |
821 | + return func ? func(operation) : 1; | |
822 | +} | |
823 | + | |
824 | +static inline int ccs_socket_create_permission(int family, int type, | |
825 | + int protocol) | |
826 | +{ | |
827 | + int (*func) (int, int, int) = ccsecurity_ops.socket_create_permission; | |
828 | + return func ? func(family, type, protocol) : 0; | |
829 | +} | |
830 | + | |
831 | +static inline int ccs_ptrace_permission(long request, long pid) | |
832 | +{ | |
833 | + int (*func) (long, long) = ccsecurity_ops.ptrace_permission; | |
834 | + return func ? func(request, pid) : 0; | |
835 | +} | |
836 | + | |
837 | +#else | |
838 | + | |
839 | +static inline _Bool ccs_capable(const u8 operation) | |
840 | +{ | |
841 | + return 1; | |
842 | +} | |
843 | + | |
844 | +static inline int ccs_socket_create_permission(int family, int type, | |
845 | + int protocol) | |
846 | +{ | |
847 | + return 0; | |
848 | +} | |
849 | + | |
850 | +static inline int ccs_ptrace_permission(long request, long pid) | |
851 | +{ | |
852 | + return 0; | |
853 | +} | |
854 | + | |
855 | +#endif | |
856 | + | |
857 | +#ifdef CONFIG_CCSECURITY_IPC | |
858 | + | |
859 | +static inline int ccs_kill_permission(pid_t pid, int sig) | |
860 | +{ | |
861 | + int (*func) (pid_t, int) = ccsecurity_ops.kill_permission; | |
862 | + return func ? func(pid, sig) : 0; | |
863 | +} | |
864 | + | |
865 | +static inline int ccs_tgkill_permission(pid_t tgid, pid_t pid, int sig) | |
866 | +{ | |
867 | + int (*func) (pid_t, pid_t, int) = ccsecurity_ops.tgkill_permission; | |
868 | + return func ? func(tgid, pid, sig) : 0; | |
869 | +} | |
870 | + | |
871 | +static inline int ccs_tkill_permission(pid_t pid, int sig) | |
872 | +{ | |
873 | + int (*func) (pid_t, int) = ccsecurity_ops.tkill_permission; | |
874 | + return func ? func(pid, sig) : 0; | |
875 | +} | |
876 | + | |
877 | +static inline int ccs_sigqueue_permission(pid_t pid, int sig) | |
878 | +{ | |
879 | + int (*func) (pid_t, int) = ccsecurity_ops.sigqueue_permission; | |
880 | + return func ? func(pid, sig) : 0; | |
881 | +} | |
882 | + | |
883 | +static inline int ccs_tgsigqueue_permission(pid_t tgid, pid_t pid, int sig) | |
884 | +{ | |
885 | + int (*func) (pid_t, pid_t, int) = ccsecurity_ops.tgsigqueue_permission; | |
886 | + return func ? func(tgid, pid, sig) : 0; | |
887 | +} | |
888 | + | |
889 | +#else | |
890 | + | |
891 | +static inline int ccs_kill_permission(pid_t pid, int sig) | |
892 | +{ | |
893 | + return 0; | |
894 | +} | |
895 | + | |
896 | +static inline int ccs_tgkill_permission(pid_t tgid, pid_t pid, int sig) | |
897 | +{ | |
898 | + return 0; | |
899 | +} | |
900 | + | |
901 | +static inline int ccs_tkill_permission(pid_t pid, int sig) | |
902 | +{ | |
903 | + return 0; | |
904 | +} | |
905 | + | |
906 | +static inline int ccs_sigqueue_permission(pid_t pid, int sig) | |
907 | +{ | |
908 | + return 0; | |
909 | +} | |
910 | + | |
911 | +static inline int ccs_tgsigqueue_permission(pid_t tgid, pid_t pid, int sig) | |
912 | +{ | |
913 | + return 0; | |
914 | +} | |
915 | + | |
916 | +#endif | |
917 | + | |
918 | +/* Index numbers for Capability Controls. */ | |
919 | +enum ccs_capability_acl_index { | |
920 | + /* socket(PF_ROUTE, *, *) */ | |
921 | + CCS_USE_ROUTE_SOCKET, | |
922 | + /* socket(PF_PACKET, *, *) */ | |
923 | + CCS_USE_PACKET_SOCKET, | |
924 | + /* sys_reboot() */ | |
925 | + CCS_SYS_REBOOT, | |
926 | + /* sys_vhangup() */ | |
927 | + CCS_SYS_VHANGUP, | |
928 | + /* do_settimeofday(), sys_adjtimex() */ | |
929 | + CCS_SYS_SETTIME, | |
930 | + /* sys_nice(), sys_setpriority() */ | |
931 | + CCS_SYS_NICE, | |
932 | + /* sys_sethostname(), sys_setdomainname() */ | |
933 | + CCS_SYS_SETHOSTNAME, | |
934 | + /* sys_create_module(), sys_init_module(), sys_delete_module() */ | |
935 | + CCS_USE_KERNEL_MODULE, | |
936 | + /* sys_kexec_load() */ | |
937 | + CCS_SYS_KEXEC_LOAD, | |
938 | + /* sys_ptrace() */ | |
939 | + CCS_SYS_PTRACE, | |
940 | + CCS_MAX_CAPABILITY_INDEX | |
941 | +}; | |
942 | + | |
943 | +#endif |
@@ -0,0 +1,1054 @@ | ||
1 | +/* | |
2 | + * security/ccsecurity/gc.c | |
3 | + * | |
4 | + * Copyright (C) 2005-2012 NTT DATA CORPORATION | |
5 | + * | |
6 | + * Version: 1.8.6 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include "internal.h" | |
10 | + | |
11 | +/***** SECTION1: Constants definition *****/ | |
12 | + | |
13 | +/* For compatibility with older kernels. */ | |
14 | +#ifndef for_each_process | |
15 | +#define for_each_process for_each_task | |
16 | +#endif | |
17 | + | |
18 | +/* The list for "struct ccs_io_buffer". */ | |
19 | +static LIST_HEAD(ccs_io_buffer_list); | |
20 | +/* Lock for protecting ccs_io_buffer_list. */ | |
21 | +static DEFINE_SPINLOCK(ccs_io_buffer_list_lock); | |
22 | + | |
23 | +/***** SECTION2: Structure definition *****/ | |
24 | + | |
25 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19) | |
26 | + | |
27 | +/* | |
28 | + * Lock for syscall users. | |
29 | + * | |
30 | + * This lock is used for protecting single SRCU section for 2.6.18 and | |
31 | + * earlier kernels because they don't have SRCU support. | |
32 | + */ | |
33 | +struct ccs_lock_struct { | |
34 | + int counter_idx; /* Currently active index (0 or 1). */ | |
35 | + int counter[2]; /* Current users. Protected by ccs_counter_lock. */ | |
36 | +}; | |
37 | + | |
38 | +#endif | |
39 | + | |
40 | +/***** SECTION3: Prototype definition section *****/ | |
41 | + | |
42 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19) | |
43 | +int ccs_lock(void); | |
44 | +#endif | |
45 | +void ccs_del_acl(struct list_head *element); | |
46 | +void ccs_del_condition(struct list_head *element); | |
47 | +void ccs_notify_gc(struct ccs_io_buffer *head, const bool is_register); | |
48 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19) | |
49 | +void ccs_unlock(const int idx); | |
50 | +#endif | |
51 | + | |
52 | +static bool ccs_domain_used_by_task(struct ccs_domain_info *domain); | |
53 | +static bool ccs_name_used_by_io_buffer(const char *string, const size_t size); | |
54 | +static bool ccs_struct_used_by_io_buffer(const struct list_head *element); | |
55 | +static int ccs_gc_thread(void *unused); | |
56 | +static void ccs_collect_acl(struct list_head *list); | |
57 | +static void ccs_collect_entry(void); | |
58 | +static void ccs_collect_member(const enum ccs_policy_id id, | |
59 | + struct list_head *member_list); | |
60 | +static void ccs_memory_free(const void *ptr, const enum ccs_policy_id type); | |
61 | +static void ccs_put_name_union(struct ccs_name_union *ptr); | |
62 | +static void ccs_put_number_union(struct ccs_number_union *ptr); | |
63 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19) | |
64 | +static void ccs_synchronize_counter(void); | |
65 | +#endif | |
66 | +static void ccs_try_to_gc(const enum ccs_policy_id type, | |
67 | + struct list_head *element); | |
68 | + | |
69 | +/***** SECTION4: Standalone functions section *****/ | |
70 | + | |
71 | +/***** SECTION5: Variables definition section *****/ | |
72 | + | |
73 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19) | |
74 | + | |
75 | +/* | |
76 | + * Lock for syscall users. | |
77 | + * | |
78 | + * This lock is held for only protecting single SRCU section. | |
79 | + */ | |
80 | +struct srcu_struct ccs_ss; | |
81 | + | |
82 | +#else | |
83 | + | |
84 | +static struct ccs_lock_struct ccs_counter; | |
85 | +/* Lock for protecting ccs_counter. */ | |
86 | +static DEFINE_SPINLOCK(ccs_counter_lock); | |
87 | + | |
88 | +#endif | |
89 | + | |
90 | +/***** SECTION6: Dependent functions section *****/ | |
91 | + | |
92 | +/** | |
93 | + * ccs_memory_free - Free memory for elements. | |
94 | + * | |
95 | + * @ptr: Pointer to allocated memory. | |
96 | + * @type: One of values in "enum ccs_policy_id". | |
97 | + * | |
98 | + * Returns nothing. | |
99 | + * | |
100 | + * Caller holds ccs_policy_lock mutex. | |
101 | + */ | |
102 | +static void ccs_memory_free(const void *ptr, const enum ccs_policy_id type) | |
103 | +{ | |
104 | + /* Size of an element. */ | |
105 | + static const u8 e[CCS_MAX_POLICY] = { | |
106 | +#ifdef CONFIG_CCSECURITY_PORTRESERVE | |
107 | + [CCS_ID_RESERVEDPORT] = sizeof(struct ccs_reserved), | |
108 | +#endif | |
109 | + [CCS_ID_GROUP] = sizeof(struct ccs_group), | |
110 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
111 | + [CCS_ID_ADDRESS_GROUP] = sizeof(struct ccs_address_group), | |
112 | +#endif | |
113 | + [CCS_ID_PATH_GROUP] = sizeof(struct ccs_path_group), | |
114 | + [CCS_ID_NUMBER_GROUP] = sizeof(struct ccs_number_group), | |
115 | + [CCS_ID_AGGREGATOR] = sizeof(struct ccs_aggregator), | |
116 | + [CCS_ID_TRANSITION_CONTROL] | |
117 | + = sizeof(struct ccs_transition_control), | |
118 | + [CCS_ID_MANAGER] = sizeof(struct ccs_manager), | |
119 | + /* [CCS_ID_CONDITION] = "struct ccs_condition"->size, */ | |
120 | + /* [CCS_ID_NAME] = "struct ccs_name"->size, */ | |
121 | + /* [CCS_ID_ACL] = a["struct ccs_acl_info"->type], */ | |
122 | + [CCS_ID_DOMAIN] = sizeof(struct ccs_domain_info), | |
123 | + }; | |
124 | + /* Size of a domain ACL element. */ | |
125 | + static const u8 a[] = { | |
126 | + [CCS_TYPE_PATH_ACL] = sizeof(struct ccs_path_acl), | |
127 | + [CCS_TYPE_PATH2_ACL] = sizeof(struct ccs_path2_acl), | |
128 | + [CCS_TYPE_PATH_NUMBER_ACL] | |
129 | + = sizeof(struct ccs_path_number_acl), | |
130 | + [CCS_TYPE_MKDEV_ACL] = sizeof(struct ccs_mkdev_acl), | |
131 | + [CCS_TYPE_MOUNT_ACL] = sizeof(struct ccs_mount_acl), | |
132 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
133 | + [CCS_TYPE_INET_ACL] = sizeof(struct ccs_inet_acl), | |
134 | + [CCS_TYPE_UNIX_ACL] = sizeof(struct ccs_unix_acl), | |
135 | +#endif | |
136 | +#ifdef CONFIG_CCSECURITY_MISC | |
137 | + [CCS_TYPE_ENV_ACL] = sizeof(struct ccs_env_acl), | |
138 | +#endif | |
139 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
140 | + [CCS_TYPE_CAPABILITY_ACL] = sizeof(struct ccs_capability_acl), | |
141 | +#endif | |
142 | +#ifdef CONFIG_CCSECURITY_IPC | |
143 | + [CCS_TYPE_SIGNAL_ACL] = sizeof(struct ccs_signal_acl), | |
144 | +#endif | |
145 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
146 | + [CCS_TYPE_AUTO_EXECUTE_HANDLER] | |
147 | + = sizeof(struct ccs_handler_acl), | |
148 | + [CCS_TYPE_DENIED_EXECUTE_HANDLER] | |
149 | + = sizeof(struct ccs_handler_acl), | |
150 | +#endif | |
151 | +#ifdef CONFIG_CCSECURITY_TASK_DOMAIN_TRANSITION | |
152 | + [CCS_TYPE_AUTO_TASK_ACL] = sizeof(struct ccs_task_acl), | |
153 | + [CCS_TYPE_MANUAL_TASK_ACL] = sizeof(struct ccs_task_acl), | |
154 | +#endif | |
155 | + }; | |
156 | + size_t size; | |
157 | + if (type == CCS_ID_ACL) | |
158 | + size = a[container_of(ptr, typeof(struct ccs_acl_info), | |
159 | + list)->type]; | |
160 | + else if (type == CCS_ID_NAME) | |
161 | + size = container_of(ptr, typeof(struct ccs_name), | |
162 | + head.list)->size; | |
163 | + else if (type == CCS_ID_CONDITION) | |
164 | + size = container_of(ptr, typeof(struct ccs_condition), | |
165 | + head.list)->size; | |
166 | + else | |
167 | + size = e[type]; | |
168 | + ccs_memory_used[CCS_MEMORY_POLICY] -= ccs_round2(size); | |
169 | + kfree(ptr); | |
170 | +} | |
171 | + | |
172 | +/** | |
173 | + * ccs_put_name_union - Drop reference on "struct ccs_name_union". | |
174 | + * | |
175 | + * @ptr: Pointer to "struct ccs_name_union". | |
176 | + * | |
177 | + * Returns nothing. | |
178 | + */ | |
179 | +static void ccs_put_name_union(struct ccs_name_union *ptr) | |
180 | +{ | |
181 | + ccs_put_group(ptr->group); | |
182 | + ccs_put_name(ptr->filename); | |
183 | +} | |
184 | + | |
185 | +/** | |
186 | + * ccs_put_number_union - Drop reference on "struct ccs_number_union". | |
187 | + * | |
188 | + * @ptr: Pointer to "struct ccs_number_union". | |
189 | + * | |
190 | + * Returns nothing. | |
191 | + */ | |
192 | +static void ccs_put_number_union(struct ccs_number_union *ptr) | |
193 | +{ | |
194 | + ccs_put_group(ptr->group); | |
195 | +} | |
196 | + | |
197 | +/** | |
198 | + * ccs_struct_used_by_io_buffer - Check whether the list element is used by /proc/ccs/ users or not. | |
199 | + * | |
200 | + * @element: Pointer to "struct list_head". | |
201 | + * | |
202 | + * Returns true if @element is used by /proc/ccs/ users, false otherwise. | |
203 | + */ | |
204 | +static bool ccs_struct_used_by_io_buffer(const struct list_head *element) | |
205 | +{ | |
206 | + struct ccs_io_buffer *head; | |
207 | + bool in_use = false; | |
208 | + spin_lock(&ccs_io_buffer_list_lock); | |
209 | + list_for_each_entry(head, &ccs_io_buffer_list, list) { | |
210 | + head->users++; | |
211 | + spin_unlock(&ccs_io_buffer_list_lock); | |
212 | + mutex_lock(&head->io_sem); | |
213 | + if (head->r.domain == element || head->r.group == element || | |
214 | + head->r.acl == element || &head->w.domain->list == element) | |
215 | + in_use = true; | |
216 | + mutex_unlock(&head->io_sem); | |
217 | + spin_lock(&ccs_io_buffer_list_lock); | |
218 | + head->users--; | |
219 | + if (in_use) | |
220 | + break; | |
221 | + } | |
222 | + spin_unlock(&ccs_io_buffer_list_lock); | |
223 | + return in_use; | |
224 | +} | |
225 | + | |
226 | +/** | |
227 | + * ccs_name_used_by_io_buffer - Check whether the string is used by /proc/ccs/ users or not. | |
228 | + * | |
229 | + * @string: String to check. | |
230 | + * @size: Memory allocated for @string . | |
231 | + * | |
232 | + * Returns true if @string is used by /proc/ccs/ users, false otherwise. | |
233 | + */ | |
234 | +static bool ccs_name_used_by_io_buffer(const char *string, const size_t size) | |
235 | +{ | |
236 | + struct ccs_io_buffer *head; | |
237 | + bool in_use = false; | |
238 | + spin_lock(&ccs_io_buffer_list_lock); | |
239 | + list_for_each_entry(head, &ccs_io_buffer_list, list) { | |
240 | + int i; | |
241 | + head->users++; | |
242 | + spin_unlock(&ccs_io_buffer_list_lock); | |
243 | + mutex_lock(&head->io_sem); | |
244 | + for (i = 0; i < CCS_MAX_IO_READ_QUEUE; i++) { | |
245 | + const char *w = head->r.w[i]; | |
246 | + if (w < string || w > string + size) | |
247 | + continue; | |
248 | + in_use = true; | |
249 | + break; | |
250 | + } | |
251 | + mutex_unlock(&head->io_sem); | |
252 | + spin_lock(&ccs_io_buffer_list_lock); | |
253 | + head->users--; | |
254 | + if (in_use) | |
255 | + break; | |
256 | + } | |
257 | + spin_unlock(&ccs_io_buffer_list_lock); | |
258 | + return in_use; | |
259 | +} | |
260 | + | |
261 | +/** | |
262 | + * ccs_del_transition_control - Delete members in "struct ccs_transition_control". | |
263 | + * | |
264 | + * @element: Pointer to "struct list_head". | |
265 | + * | |
266 | + * Returns nothing. | |
267 | + */ | |
268 | +static inline void ccs_del_transition_control(struct list_head *element) | |
269 | +{ | |
270 | + struct ccs_transition_control *ptr = | |
271 | + container_of(element, typeof(*ptr), head.list); | |
272 | + ccs_put_name(ptr->domainname); | |
273 | + ccs_put_name(ptr->program); | |
274 | +} | |
275 | + | |
276 | +/** | |
277 | + * ccs_del_aggregator - Delete members in "struct ccs_aggregator". | |
278 | + * | |
279 | + * @element: Pointer to "struct list_head". | |
280 | + * | |
281 | + * Returns nothing. | |
282 | + */ | |
283 | +static inline void ccs_del_aggregator(struct list_head *element) | |
284 | +{ | |
285 | + struct ccs_aggregator *ptr = | |
286 | + container_of(element, typeof(*ptr), head.list); | |
287 | + ccs_put_name(ptr->original_name); | |
288 | + ccs_put_name(ptr->aggregated_name); | |
289 | +} | |
290 | + | |
291 | +/** | |
292 | + * ccs_del_manager - Delete members in "struct ccs_manager". | |
293 | + * | |
294 | + * @element: Pointer to "struct list_head". | |
295 | + * | |
296 | + * Returns nothing. | |
297 | + */ | |
298 | +static inline void ccs_del_manager(struct list_head *element) | |
299 | +{ | |
300 | + struct ccs_manager *ptr = | |
301 | + container_of(element, typeof(*ptr), head.list); | |
302 | + ccs_put_name(ptr->manager); | |
303 | +} | |
304 | + | |
305 | +/** | |
306 | + * ccs_domain_used_by_task - Check whether the given pointer is referenced by a task. | |
307 | + * | |
308 | + * @domain: Pointer to "struct ccs_domain_info". | |
309 | + * | |
310 | + * Returns true if @domain is in use, false otherwise. | |
311 | + */ | |
312 | +static bool ccs_domain_used_by_task(struct ccs_domain_info *domain) | |
313 | +{ | |
314 | + bool in_use = false; | |
315 | + /* | |
316 | + * Don't delete this domain if somebody is doing execve(). | |
317 | + * | |
318 | + * Since ccs_finish_execve() first reverts ccs_domain_info and then | |
319 | + * updates ccs_flags, we need smp_rmb() to make sure that GC first | |
320 | + * checks ccs_flags and then checks ccs_domain_info. | |
321 | + */ | |
322 | +#ifdef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
323 | + int idx; | |
324 | + rcu_read_lock(); | |
325 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) { | |
326 | + struct ccs_security *ptr; | |
327 | + struct list_head *list = &ccs_task_security_list[idx]; | |
328 | + list_for_each_entry_rcu(ptr, list, list) { | |
329 | + if (!(ptr->ccs_flags & CCS_TASK_IS_IN_EXECVE)) { | |
330 | + smp_rmb(); /* Avoid out of order execution. */ | |
331 | + if (ptr->ccs_domain_info != domain) | |
332 | + continue; | |
333 | + } | |
334 | + in_use = true; | |
335 | + goto out; | |
336 | + } | |
337 | + } | |
338 | + in_use = ccs_used_by_cred(domain); | |
339 | +out: | |
340 | + rcu_read_unlock(); | |
341 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0) || defined(for_each_process_thread) | |
342 | + struct task_struct *g; | |
343 | + struct task_struct *t; | |
344 | + rcu_read_lock(); | |
345 | + for_each_process_thread(g, t) { | |
346 | + if (!(t->ccs_flags & CCS_TASK_IS_IN_EXECVE)) { | |
347 | + smp_rmb(); /* Avoid out of order execution. */ | |
348 | + if (t->ccs_domain_info != domain) | |
349 | + continue; | |
350 | + } | |
351 | + in_use = true; | |
352 | + goto out; | |
353 | + } | |
354 | +out: | |
355 | + rcu_read_unlock(); | |
356 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) | |
357 | + struct task_struct *g; | |
358 | + struct task_struct *t; | |
359 | + rcu_read_lock(); | |
360 | + read_lock(&tasklist_lock); | |
361 | + do_each_thread(g, t) { | |
362 | + if (!(t->ccs_flags & CCS_TASK_IS_IN_EXECVE)) { | |
363 | + smp_rmb(); /* Avoid out of order execution. */ | |
364 | + if (t->ccs_domain_info != domain) | |
365 | + continue; | |
366 | + } | |
367 | + in_use = true; | |
368 | + goto out; | |
369 | + } while_each_thread(g, t); | |
370 | +out: | |
371 | + read_unlock(&tasklist_lock); | |
372 | + rcu_read_unlock(); | |
373 | +#else | |
374 | + struct task_struct *p; | |
375 | + read_lock(&tasklist_lock); | |
376 | + for_each_process(p) { | |
377 | + if (!(p->ccs_flags & CCS_TASK_IS_IN_EXECVE)) { | |
378 | + smp_rmb(); /* Avoid out of order execution. */ | |
379 | + if (p->ccs_domain_info != domain) | |
380 | + continue; | |
381 | + } | |
382 | + in_use = true; | |
383 | + break; | |
384 | + } | |
385 | + read_unlock(&tasklist_lock); | |
386 | +#endif | |
387 | + return in_use; | |
388 | +} | |
389 | + | |
390 | +/** | |
391 | + * ccs_del_acl - Delete members in "struct ccs_acl_info". | |
392 | + * | |
393 | + * @element: Pointer to "struct list_head". | |
394 | + * | |
395 | + * Returns nothing. | |
396 | + */ | |
397 | +void ccs_del_acl(struct list_head *element) | |
398 | +{ | |
399 | + struct ccs_acl_info *acl = container_of(element, typeof(*acl), list); | |
400 | + ccs_put_condition(acl->cond); | |
401 | + switch (acl->type) { | |
402 | + case CCS_TYPE_PATH_ACL: | |
403 | + { | |
404 | + struct ccs_path_acl *entry = | |
405 | + container_of(acl, typeof(*entry), head); | |
406 | + ccs_put_name_union(&entry->name); | |
407 | + } | |
408 | + break; | |
409 | + case CCS_TYPE_PATH2_ACL: | |
410 | + { | |
411 | + struct ccs_path2_acl *entry = | |
412 | + container_of(acl, typeof(*entry), head); | |
413 | + ccs_put_name_union(&entry->name1); | |
414 | + ccs_put_name_union(&entry->name2); | |
415 | + } | |
416 | + break; | |
417 | + case CCS_TYPE_PATH_NUMBER_ACL: | |
418 | + { | |
419 | + struct ccs_path_number_acl *entry = | |
420 | + container_of(acl, typeof(*entry), head); | |
421 | + ccs_put_name_union(&entry->name); | |
422 | + ccs_put_number_union(&entry->number); | |
423 | + } | |
424 | + break; | |
425 | + case CCS_TYPE_MKDEV_ACL: | |
426 | + { | |
427 | + struct ccs_mkdev_acl *entry = | |
428 | + container_of(acl, typeof(*entry), head); | |
429 | + ccs_put_name_union(&entry->name); | |
430 | + ccs_put_number_union(&entry->mode); | |
431 | + ccs_put_number_union(&entry->major); | |
432 | + ccs_put_number_union(&entry->minor); | |
433 | + } | |
434 | + break; | |
435 | + case CCS_TYPE_MOUNT_ACL: | |
436 | + { | |
437 | + struct ccs_mount_acl *entry = | |
438 | + container_of(acl, typeof(*entry), head); | |
439 | + ccs_put_name_union(&entry->dev_name); | |
440 | + ccs_put_name_union(&entry->dir_name); | |
441 | + ccs_put_name_union(&entry->fs_type); | |
442 | + ccs_put_number_union(&entry->flags); | |
443 | + } | |
444 | + break; | |
445 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
446 | + case CCS_TYPE_INET_ACL: | |
447 | + { | |
448 | + struct ccs_inet_acl *entry = | |
449 | + container_of(acl, typeof(*entry), head); | |
450 | + ccs_put_group(entry->address.group); | |
451 | + ccs_put_number_union(&entry->port); | |
452 | + } | |
453 | + break; | |
454 | + case CCS_TYPE_UNIX_ACL: | |
455 | + { | |
456 | + struct ccs_unix_acl *entry = | |
457 | + container_of(acl, typeof(*entry), head); | |
458 | + ccs_put_name_union(&entry->name); | |
459 | + } | |
460 | + break; | |
461 | +#endif | |
462 | +#ifdef CONFIG_CCSECURITY_MISC | |
463 | + case CCS_TYPE_ENV_ACL: | |
464 | + { | |
465 | + struct ccs_env_acl *entry = | |
466 | + container_of(acl, typeof(*entry), head); | |
467 | + ccs_put_name(entry->env); | |
468 | + } | |
469 | + break; | |
470 | +#endif | |
471 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
472 | + case CCS_TYPE_CAPABILITY_ACL: | |
473 | + { | |
474 | + /* Nothing to do. */ | |
475 | + } | |
476 | + break; | |
477 | +#endif | |
478 | +#ifdef CONFIG_CCSECURITY_IPC | |
479 | + case CCS_TYPE_SIGNAL_ACL: | |
480 | + { | |
481 | + struct ccs_signal_acl *entry = | |
482 | + container_of(acl, typeof(*entry), head); | |
483 | + ccs_put_number_union(&entry->sig); | |
484 | + ccs_put_name(entry->domainname); | |
485 | + } | |
486 | + break; | |
487 | +#endif | |
488 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
489 | + case CCS_TYPE_AUTO_EXECUTE_HANDLER: | |
490 | + case CCS_TYPE_DENIED_EXECUTE_HANDLER: | |
491 | + { | |
492 | + struct ccs_handler_acl *entry = | |
493 | + container_of(acl, typeof(*entry), head); | |
494 | + ccs_put_name(entry->handler); | |
495 | + } | |
496 | + break; | |
497 | +#endif | |
498 | +#ifdef CONFIG_CCSECURITY_TASK_DOMAIN_TRANSITION | |
499 | + case CCS_TYPE_AUTO_TASK_ACL: | |
500 | + case CCS_TYPE_MANUAL_TASK_ACL: | |
501 | + { | |
502 | + struct ccs_task_acl *entry = | |
503 | + container_of(acl, typeof(*entry), head); | |
504 | + ccs_put_name(entry->domainname); | |
505 | + } | |
506 | + break; | |
507 | +#endif | |
508 | + } | |
509 | +} | |
510 | + | |
511 | +/** | |
512 | + * ccs_del_domain - Delete members in "struct ccs_domain_info". | |
513 | + * | |
514 | + * @element: Pointer to "struct list_head". | |
515 | + * | |
516 | + * Returns nothing. | |
517 | + * | |
518 | + * Caller holds ccs_policy_lock mutex. | |
519 | + */ | |
520 | +static inline void ccs_del_domain(struct list_head *element) | |
521 | +{ | |
522 | + struct ccs_domain_info *domain = | |
523 | + container_of(element, typeof(*domain), list); | |
524 | + struct ccs_acl_info *acl; | |
525 | + struct ccs_acl_info *tmp; | |
526 | + /* | |
527 | + * Since this domain is referenced from neither "struct ccs_io_buffer" | |
528 | + * nor "struct task_struct", we can delete elements without checking | |
529 | + * for is_deleted flag. | |
530 | + */ | |
531 | + list_for_each_entry_safe(acl, tmp, &domain->acl_info_list, list) { | |
532 | + ccs_del_acl(&acl->list); | |
533 | + ccs_memory_free(acl, CCS_ID_ACL); | |
534 | + } | |
535 | + ccs_put_name(domain->domainname); | |
536 | +} | |
537 | + | |
538 | +/** | |
539 | + * ccs_del_path_group - Delete members in "struct ccs_path_group". | |
540 | + * | |
541 | + * @element: Pointer to "struct list_head". | |
542 | + * | |
543 | + * Returns nothing. | |
544 | + */ | |
545 | +static inline void ccs_del_path_group(struct list_head *element) | |
546 | +{ | |
547 | + struct ccs_path_group *member = | |
548 | + container_of(element, typeof(*member), head.list); | |
549 | + ccs_put_name(member->member_name); | |
550 | +} | |
551 | + | |
552 | +/** | |
553 | + * ccs_del_group - Delete "struct ccs_group". | |
554 | + * | |
555 | + * @element: Pointer to "struct list_head". | |
556 | + * | |
557 | + * Returns nothing. | |
558 | + */ | |
559 | +static inline void ccs_del_group(struct list_head *element) | |
560 | +{ | |
561 | + struct ccs_group *group = | |
562 | + container_of(element, typeof(*group), head.list); | |
563 | + ccs_put_name(group->group_name); | |
564 | +} | |
565 | + | |
566 | +/** | |
567 | + * ccs_del_address_group - Delete members in "struct ccs_address_group". | |
568 | + * | |
569 | + * @element: Pointer to "struct list_head". | |
570 | + * | |
571 | + * Returns nothing. | |
572 | + */ | |
573 | +static inline void ccs_del_address_group(struct list_head *element) | |
574 | +{ | |
575 | + /* Nothing to do. */ | |
576 | +} | |
577 | + | |
578 | +/** | |
579 | + * ccs_del_number_group - Delete members in "struct ccs_number_group". | |
580 | + * | |
581 | + * @element: Pointer to "struct list_head". | |
582 | + * | |
583 | + * Returns nothing. | |
584 | + */ | |
585 | +static inline void ccs_del_number_group(struct list_head *element) | |
586 | +{ | |
587 | + /* Nothing to do. */ | |
588 | +} | |
589 | + | |
590 | +/** | |
591 | + * ccs_del_reservedport - Delete members in "struct ccs_reserved". | |
592 | + * | |
593 | + * @element: Pointer to "struct list_head". | |
594 | + * | |
595 | + * Returns nothing. | |
596 | + */ | |
597 | +static inline void ccs_del_reservedport(struct list_head *element) | |
598 | +{ | |
599 | + /* Nothing to do. */ | |
600 | +} | |
601 | + | |
602 | +/** | |
603 | + * ccs_del_condition - Delete members in "struct ccs_condition". | |
604 | + * | |
605 | + * @element: Pointer to "struct list_head". | |
606 | + * | |
607 | + * Returns nothing. | |
608 | + */ | |
609 | +void ccs_del_condition(struct list_head *element) | |
610 | +{ | |
611 | + struct ccs_condition *cond = container_of(element, typeof(*cond), | |
612 | + head.list); | |
613 | + const u16 condc = cond->condc; | |
614 | + const u16 numbers_count = cond->numbers_count; | |
615 | + const u16 names_count = cond->names_count; | |
616 | + const u16 argc = cond->argc; | |
617 | + const u16 envc = cond->envc; | |
618 | + unsigned int i; | |
619 | + const struct ccs_condition_element *condp | |
620 | + = (const struct ccs_condition_element *) (cond + 1); | |
621 | + struct ccs_number_union *numbers_p | |
622 | + = (struct ccs_number_union *) (condp + condc); | |
623 | + struct ccs_name_union *names_p | |
624 | + = (struct ccs_name_union *) (numbers_p + numbers_count); | |
625 | + const struct ccs_argv *argv | |
626 | + = (const struct ccs_argv *) (names_p + names_count); | |
627 | + const struct ccs_envp *envp | |
628 | + = (const struct ccs_envp *) (argv + argc); | |
629 | + for (i = 0; i < numbers_count; i++) | |
630 | + ccs_put_number_union(numbers_p++); | |
631 | + for (i = 0; i < names_count; i++) | |
632 | + ccs_put_name_union(names_p++); | |
633 | + for (i = 0; i < argc; argv++, i++) | |
634 | + ccs_put_name(argv->value); | |
635 | + for (i = 0; i < envc; envp++, i++) { | |
636 | + ccs_put_name(envp->name); | |
637 | + ccs_put_name(envp->value); | |
638 | + } | |
639 | + ccs_put_name(cond->transit); | |
640 | +} | |
641 | + | |
642 | +/** | |
643 | + * ccs_del_name - Delete members in "struct ccs_name". | |
644 | + * | |
645 | + * @element: Pointer to "struct list_head". | |
646 | + * | |
647 | + * Returns nothing. | |
648 | + */ | |
649 | +static inline void ccs_del_name(struct list_head *element) | |
650 | +{ | |
651 | + /* Nothing to do. */ | |
652 | +} | |
653 | + | |
654 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19) | |
655 | + | |
656 | +/** | |
657 | + * ccs_lock - Alternative for srcu_read_lock(). | |
658 | + * | |
659 | + * Returns index number which has to be passed to ccs_unlock(). | |
660 | + */ | |
661 | +int ccs_lock(void) | |
662 | +{ | |
663 | + int idx; | |
664 | + spin_lock(&ccs_counter_lock); | |
665 | + idx = ccs_counter.counter_idx; | |
666 | + ccs_counter.counter[idx]++; | |
667 | + spin_unlock(&ccs_counter_lock); | |
668 | + return idx; | |
669 | +} | |
670 | + | |
671 | +/** | |
672 | + * ccs_unlock - Alternative for srcu_read_unlock(). | |
673 | + * | |
674 | + * @idx: Index number returned by ccs_lock(). | |
675 | + * | |
676 | + * Returns nothing. | |
677 | + */ | |
678 | +void ccs_unlock(const int idx) | |
679 | +{ | |
680 | + spin_lock(&ccs_counter_lock); | |
681 | + ccs_counter.counter[idx]--; | |
682 | + spin_unlock(&ccs_counter_lock); | |
683 | +} | |
684 | + | |
685 | +/** | |
686 | + * ccs_synchronize_counter - Alternative for synchronize_srcu(). | |
687 | + * | |
688 | + * Returns nothing. | |
689 | + */ | |
690 | +static void ccs_synchronize_counter(void) | |
691 | +{ | |
692 | + int idx; | |
693 | + int v; | |
694 | + /* | |
695 | + * Change currently active counter's index. Make it visible to other | |
696 | + * threads by doing it with ccs_counter_lock held. | |
697 | + * This function is called by garbage collector thread, and the garbage | |
698 | + * collector thread is exclusive. Therefore, it is guaranteed that | |
699 | + * SRCU grace period has expired when returning from this function. | |
700 | + */ | |
701 | + spin_lock(&ccs_counter_lock); | |
702 | + idx = ccs_counter.counter_idx; | |
703 | + ccs_counter.counter_idx ^= 1; | |
704 | + v = ccs_counter.counter[idx]; | |
705 | + spin_unlock(&ccs_counter_lock); | |
706 | + /* Wait for previously active counter to become 0. */ | |
707 | + while (v) { | |
708 | + ssleep(1); | |
709 | + spin_lock(&ccs_counter_lock); | |
710 | + v = ccs_counter.counter[idx]; | |
711 | + spin_unlock(&ccs_counter_lock); | |
712 | + } | |
713 | +} | |
714 | + | |
715 | +#endif | |
716 | + | |
717 | +/** | |
718 | + * ccs_try_to_gc - Try to kfree() an entry. | |
719 | + * | |
720 | + * @type: One of values in "enum ccs_policy_id". | |
721 | + * @element: Pointer to "struct list_head". | |
722 | + * | |
723 | + * Returns nothing. | |
724 | + * | |
725 | + * Caller holds ccs_policy_lock mutex. | |
726 | + */ | |
727 | +static void ccs_try_to_gc(const enum ccs_policy_id type, | |
728 | + struct list_head *element) | |
729 | +{ | |
730 | + /* | |
731 | + * __list_del_entry() guarantees that the list element became no longer | |
732 | + * reachable from the list which the element was originally on (e.g. | |
733 | + * ccs_domain_list). Also, synchronize_srcu() guarantees that the list | |
734 | + * element became no longer referenced by syscall users. | |
735 | + */ | |
736 | + __list_del_entry(element); | |
737 | + mutex_unlock(&ccs_policy_lock); | |
738 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19) | |
739 | + synchronize_srcu(&ccs_ss); | |
740 | +#else | |
741 | + ccs_synchronize_counter(); | |
742 | +#endif | |
743 | + /* | |
744 | + * However, there are two users which may still be using the list | |
745 | + * element. We need to defer until both users forget this element. | |
746 | + * | |
747 | + * Don't kfree() until "struct ccs_io_buffer"->r.{domain,group,acl} and | |
748 | + * "struct ccs_io_buffer"->w.domain forget this element. | |
749 | + */ | |
750 | + if (ccs_struct_used_by_io_buffer(element)) | |
751 | + goto reinject; | |
752 | + switch (type) { | |
753 | + case CCS_ID_TRANSITION_CONTROL: | |
754 | + ccs_del_transition_control(element); | |
755 | + break; | |
756 | + case CCS_ID_MANAGER: | |
757 | + ccs_del_manager(element); | |
758 | + break; | |
759 | + case CCS_ID_AGGREGATOR: | |
760 | + ccs_del_aggregator(element); | |
761 | + break; | |
762 | + case CCS_ID_GROUP: | |
763 | + ccs_del_group(element); | |
764 | + break; | |
765 | + case CCS_ID_PATH_GROUP: | |
766 | + ccs_del_path_group(element); | |
767 | + break; | |
768 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
769 | + case CCS_ID_ADDRESS_GROUP: | |
770 | + ccs_del_address_group(element); | |
771 | + break; | |
772 | +#endif | |
773 | + case CCS_ID_NUMBER_GROUP: | |
774 | + ccs_del_number_group(element); | |
775 | + break; | |
776 | +#ifdef CONFIG_CCSECURITY_PORTRESERVE | |
777 | + case CCS_ID_RESERVEDPORT: | |
778 | + ccs_del_reservedport(element); | |
779 | + break; | |
780 | +#endif | |
781 | + case CCS_ID_CONDITION: | |
782 | + ccs_del_condition(element); | |
783 | + break; | |
784 | + case CCS_ID_NAME: | |
785 | + /* | |
786 | + * Don't kfree() until all "struct ccs_io_buffer"->r.w[] forget | |
787 | + * this element. | |
788 | + */ | |
789 | + if (ccs_name_used_by_io_buffer | |
790 | + (container_of(element, typeof(struct ccs_name), | |
791 | + head.list)->entry.name, | |
792 | + container_of(element, typeof(struct ccs_name), | |
793 | + head.list)->size)) | |
794 | + goto reinject; | |
795 | + ccs_del_name(element); | |
796 | + break; | |
797 | + case CCS_ID_ACL: | |
798 | + ccs_del_acl(element); | |
799 | + break; | |
800 | + case CCS_ID_DOMAIN: | |
801 | + /* | |
802 | + * Don't kfree() until all "struct task_struct" forget this | |
803 | + * element. | |
804 | + */ | |
805 | + if (ccs_domain_used_by_task | |
806 | + (container_of(element, typeof(struct ccs_domain_info), | |
807 | + list))) | |
808 | + goto reinject; | |
809 | + break; | |
810 | + case CCS_MAX_POLICY: | |
811 | + break; | |
812 | + } | |
813 | + mutex_lock(&ccs_policy_lock); | |
814 | + if (type == CCS_ID_DOMAIN) | |
815 | + ccs_del_domain(element); | |
816 | + ccs_memory_free(element, type); | |
817 | + return; | |
818 | +reinject: | |
819 | + /* | |
820 | + * We can safely reinject this element here bacause | |
821 | + * (1) Appending list elements and removing list elements are protected | |
822 | + * by ccs_policy_lock mutex. | |
823 | + * (2) Only this function removes list elements and this function is | |
824 | + * exclusively executed by ccs_gc_mutex mutex. | |
825 | + * are true. | |
826 | + */ | |
827 | + mutex_lock(&ccs_policy_lock); | |
828 | + list_add_rcu(element, element->prev); | |
829 | +} | |
830 | + | |
831 | +/** | |
832 | + * ccs_collect_member - Delete elements with "struct ccs_acl_head". | |
833 | + * | |
834 | + * @id: One of values in "enum ccs_policy_id". | |
835 | + * @member_list: Pointer to "struct list_head". | |
836 | + * | |
837 | + * Returns nothing. | |
838 | + * | |
839 | + * Caller holds ccs_policy_lock mutex. | |
840 | + */ | |
841 | +static void ccs_collect_member(const enum ccs_policy_id id, | |
842 | + struct list_head *member_list) | |
843 | +{ | |
844 | + struct ccs_acl_head *member; | |
845 | + struct ccs_acl_head *tmp; | |
846 | + list_for_each_entry_safe(member, tmp, member_list, list) { | |
847 | + if (!member->is_deleted) | |
848 | + continue; | |
849 | + member->is_deleted = CCS_GC_IN_PROGRESS; | |
850 | + ccs_try_to_gc(id, &member->list); | |
851 | + } | |
852 | +} | |
853 | + | |
854 | +/** | |
855 | + * ccs_collect_acl - Delete elements in "struct ccs_domain_info". | |
856 | + * | |
857 | + * @list: Pointer to "struct list_head". | |
858 | + * | |
859 | + * Returns nothing. | |
860 | + * | |
861 | + * Caller holds ccs_policy_lock mutex. | |
862 | + */ | |
863 | +static void ccs_collect_acl(struct list_head *list) | |
864 | +{ | |
865 | + struct ccs_acl_info *acl; | |
866 | + struct ccs_acl_info *tmp; | |
867 | + list_for_each_entry_safe(acl, tmp, list, list) { | |
868 | + if (!acl->is_deleted) | |
869 | + continue; | |
870 | + acl->is_deleted = CCS_GC_IN_PROGRESS; | |
871 | + ccs_try_to_gc(CCS_ID_ACL, &acl->list); | |
872 | + } | |
873 | +} | |
874 | + | |
875 | +/** | |
876 | + * ccs_collect_entry - Try to kfree() deleted elements. | |
877 | + * | |
878 | + * Returns nothing. | |
879 | + */ | |
880 | +static void ccs_collect_entry(void) | |
881 | +{ | |
882 | + int i; | |
883 | + enum ccs_policy_id id; | |
884 | + struct ccs_policy_namespace *ns; | |
885 | + mutex_lock(&ccs_policy_lock); | |
886 | + { | |
887 | + struct ccs_domain_info *domain; | |
888 | + struct ccs_domain_info *tmp; | |
889 | + list_for_each_entry_safe(domain, tmp, &ccs_domain_list, list) { | |
890 | + ccs_collect_acl(&domain->acl_info_list); | |
891 | + if (!domain->is_deleted || | |
892 | + ccs_domain_used_by_task(domain)) | |
893 | + continue; | |
894 | + ccs_try_to_gc(CCS_ID_DOMAIN, &domain->list); | |
895 | + } | |
896 | + } | |
897 | + list_for_each_entry(ns, &ccs_namespace_list, namespace_list) { | |
898 | + for (id = 0; id < CCS_MAX_POLICY; id++) | |
899 | + ccs_collect_member(id, &ns->policy_list[id]); | |
900 | + for (i = 0; i < CCS_MAX_ACL_GROUPS; i++) | |
901 | + ccs_collect_acl(&ns->acl_group[i]); | |
902 | + } | |
903 | + { | |
904 | + struct ccs_shared_acl_head *ptr; | |
905 | + struct ccs_shared_acl_head *tmp; | |
906 | + list_for_each_entry_safe(ptr, tmp, &ccs_condition_list, list) { | |
907 | + if (atomic_read(&ptr->users) > 0) | |
908 | + continue; | |
909 | + atomic_set(&ptr->users, CCS_GC_IN_PROGRESS); | |
910 | + ccs_try_to_gc(CCS_ID_CONDITION, &ptr->list); | |
911 | + } | |
912 | + } | |
913 | + list_for_each_entry(ns, &ccs_namespace_list, namespace_list) { | |
914 | + for (i = 0; i < CCS_MAX_GROUP; i++) { | |
915 | + struct list_head *list = &ns->group_list[i]; | |
916 | + struct ccs_group *group; | |
917 | + struct ccs_group *tmp; | |
918 | + switch (i) { | |
919 | + case 0: | |
920 | + id = CCS_ID_PATH_GROUP; | |
921 | + break; | |
922 | + case 1: | |
923 | + id = CCS_ID_NUMBER_GROUP; | |
924 | + break; | |
925 | + default: | |
926 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
927 | + id = CCS_ID_ADDRESS_GROUP; | |
928 | +#else | |
929 | + continue; | |
930 | +#endif | |
931 | + break; | |
932 | + } | |
933 | + list_for_each_entry_safe(group, tmp, list, head.list) { | |
934 | + ccs_collect_member(id, &group->member_list); | |
935 | + if (!list_empty(&group->member_list) || | |
936 | + atomic_read(&group->head.users) > 0) | |
937 | + continue; | |
938 | + atomic_set(&group->head.users, | |
939 | + CCS_GC_IN_PROGRESS); | |
940 | + ccs_try_to_gc(CCS_ID_GROUP, &group->head.list); | |
941 | + } | |
942 | + } | |
943 | + } | |
944 | + for (i = 0; i < CCS_MAX_HASH; i++) { | |
945 | + struct list_head *list = &ccs_name_list[i]; | |
946 | + struct ccs_shared_acl_head *ptr; | |
947 | + struct ccs_shared_acl_head *tmp; | |
948 | + list_for_each_entry_safe(ptr, tmp, list, list) { | |
949 | + if (atomic_read(&ptr->users) > 0) | |
950 | + continue; | |
951 | + atomic_set(&ptr->users, CCS_GC_IN_PROGRESS); | |
952 | + ccs_try_to_gc(CCS_ID_NAME, &ptr->list); | |
953 | + } | |
954 | + } | |
955 | + mutex_unlock(&ccs_policy_lock); | |
956 | +} | |
957 | + | |
958 | +/** | |
959 | + * ccs_gc_thread - Garbage collector thread function. | |
960 | + * | |
961 | + * @unused: Unused. | |
962 | + * | |
963 | + * Returns 0. | |
964 | + */ | |
965 | +static int ccs_gc_thread(void *unused) | |
966 | +{ | |
967 | + /* Garbage collector thread is exclusive. */ | |
968 | + static DEFINE_MUTEX(ccs_gc_mutex); | |
969 | + if (!mutex_trylock(&ccs_gc_mutex)) | |
970 | + goto out; | |
971 | +#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 6) | |
972 | + /* daemonize() not needed. */ | |
973 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) | |
974 | + daemonize("GC for CCS"); | |
975 | +#else | |
976 | + daemonize(); | |
977 | + reparent_to_init(); | |
978 | +#if defined(TASK_DEAD) | |
979 | + { | |
980 | + struct task_struct *task = current; | |
981 | + spin_lock_irq(&task->sighand->siglock); | |
982 | + siginitsetinv(&task->blocked, 0); | |
983 | + recalc_sigpending(); | |
984 | + spin_unlock_irq(&task->sighand->siglock); | |
985 | + } | |
986 | +#else | |
987 | + { | |
988 | + struct task_struct *task = current; | |
989 | + spin_lock_irq(&task->sigmask_lock); | |
990 | + siginitsetinv(&task->blocked, 0); | |
991 | + recalc_sigpending(task); | |
992 | + spin_unlock_irq(&task->sigmask_lock); | |
993 | + } | |
994 | +#endif | |
995 | + snprintf(current->comm, sizeof(current->comm) - 1, "GC for CCS"); | |
996 | +#endif | |
997 | + ccs_collect_entry(); | |
998 | + { | |
999 | + struct ccs_io_buffer *head; | |
1000 | + struct ccs_io_buffer *tmp; | |
1001 | + spin_lock(&ccs_io_buffer_list_lock); | |
1002 | + list_for_each_entry_safe(head, tmp, &ccs_io_buffer_list, | |
1003 | + list) { | |
1004 | + if (head->users) | |
1005 | + continue; | |
1006 | + list_del(&head->list); | |
1007 | + kfree(head->read_buf); | |
1008 | + kfree(head->write_buf); | |
1009 | + kfree(head); | |
1010 | + } | |
1011 | + spin_unlock(&ccs_io_buffer_list_lock); | |
1012 | + } | |
1013 | + mutex_unlock(&ccs_gc_mutex); | |
1014 | +out: | |
1015 | + /* This acts as do_exit(0). */ | |
1016 | + return 0; | |
1017 | +} | |
1018 | + | |
1019 | +/** | |
1020 | + * ccs_notify_gc - Register/unregister /proc/ccs/ users. | |
1021 | + * | |
1022 | + * @head: Pointer to "struct ccs_io_buffer". | |
1023 | + * @is_register: True if register, false if unregister. | |
1024 | + * | |
1025 | + * Returns nothing. | |
1026 | + */ | |
1027 | +void ccs_notify_gc(struct ccs_io_buffer *head, const bool is_register) | |
1028 | +{ | |
1029 | + bool is_write = false; | |
1030 | + spin_lock(&ccs_io_buffer_list_lock); | |
1031 | + if (is_register) { | |
1032 | + head->users = 1; | |
1033 | + list_add(&head->list, &ccs_io_buffer_list); | |
1034 | + } else { | |
1035 | + is_write = head->write_buf != NULL; | |
1036 | + if (!--head->users) { | |
1037 | + list_del(&head->list); | |
1038 | + kfree(head->read_buf); | |
1039 | + kfree(head->write_buf); | |
1040 | + kfree(head); | |
1041 | + } | |
1042 | + } | |
1043 | + spin_unlock(&ccs_io_buffer_list_lock); | |
1044 | + if (is_write) { | |
1045 | +#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 6) | |
1046 | + struct task_struct *task = kthread_create(ccs_gc_thread, NULL, | |
1047 | + "GC for CCS"); | |
1048 | + if (!IS_ERR(task)) | |
1049 | + wake_up_process(task); | |
1050 | +#else | |
1051 | + kernel_thread(ccs_gc_thread, NULL, 0); | |
1052 | +#endif | |
1053 | + } | |
1054 | +} |
@@ -0,0 +1,2172 @@ | ||
1 | +/* | |
2 | + * security/ccsecurity/internal.h | |
3 | + * | |
4 | + * Copyright (C) 2005-2012 NTT DATA CORPORATION | |
5 | + * | |
6 | + * Version: 1.8.6 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#ifndef _SECURITY_CCSECURITY_INTERNAL_H | |
10 | +#define _SECURITY_CCSECURITY_INTERNAL_H | |
11 | + | |
12 | +#include <linux/version.h> | |
13 | +#include <linux/types.h> | |
14 | +#include <linux/kernel.h> | |
15 | +#include <linux/string.h> | |
16 | +#include <linux/mm.h> | |
17 | +#include <linux/utime.h> | |
18 | +#include <linux/file.h> | |
19 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 38) | |
20 | +#include <linux/smp_lock.h> | |
21 | +#endif | |
22 | +#include <linux/module.h> | |
23 | +#include <linux/init.h> | |
24 | +#include <linux/slab.h> | |
25 | +#include <linux/highmem.h> | |
26 | +#include <linux/poll.h> | |
27 | +#include <linux/binfmts.h> | |
28 | +#include <linux/delay.h> | |
29 | +#include <linux/sched.h> | |
30 | +#include <linux/dcache.h> | |
31 | +#include <linux/mount.h> | |
32 | +#include <linux/net.h> | |
33 | +#include <linux/inet.h> | |
34 | +#include <linux/in.h> | |
35 | +#include <linux/in6.h> | |
36 | +#include <linux/un.h> | |
37 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) | |
38 | +#include <linux/fs.h> | |
39 | +#endif | |
40 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) | |
41 | +#include <linux/namei.h> | |
42 | +#endif | |
43 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) | |
44 | +#include <linux/fs_struct.h> | |
45 | +#endif | |
46 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) | |
47 | +#include <linux/namespace.h> | |
48 | +#endif | |
49 | +#include <linux/proc_fs.h> | |
50 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) || defined(RHEL_MAJOR) | |
51 | +#include <linux/hash.h> | |
52 | +#endif | |
53 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) || (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33) && defined(CONFIG_SYSCTL_SYSCALL)) | |
54 | +#include <linux/sysctl.h> | |
55 | +#endif | |
56 | +#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 6) | |
57 | +#include <linux/kthread.h> | |
58 | +#endif | |
59 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0) | |
60 | +#include <linux/magic.h> | |
61 | +#endif | |
62 | +#include <stdarg.h> | |
63 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0) | |
64 | +#include <linux/uaccess.h> | |
65 | +#else | |
66 | +#include <asm/uaccess.h> | |
67 | +#endif | |
68 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0) | |
69 | +#include <linux/sched/signal.h> | |
70 | +#endif | |
71 | +#include <net/sock.h> | |
72 | +#include <net/af_unix.h> | |
73 | +#include <net/ip.h> | |
74 | +#include <net/ipv6.h> | |
75 | +#include <net/udp.h> | |
76 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0) | |
77 | +#include <uapi/linux/mount.h> | |
78 | +#endif | |
79 | + | |
80 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) | |
81 | +#define sk_family family | |
82 | +#define sk_protocol protocol | |
83 | +#define sk_type type | |
84 | +#endif | |
85 | + | |
86 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) | |
87 | + | |
88 | +/* Structure for holding "struct vfsmount *" and "struct dentry *". */ | |
89 | +struct path { | |
90 | + struct vfsmount *mnt; | |
91 | + struct dentry *dentry; | |
92 | +}; | |
93 | + | |
94 | +#endif | |
95 | + | |
96 | +#ifndef __printf | |
97 | +#define __printf(a,b) __attribute__((format(printf,a,b))) | |
98 | +#endif | |
99 | +#ifndef __packed | |
100 | +#define __packed __attribute__((__packed__)) | |
101 | +#endif | |
102 | +#ifndef bool | |
103 | +#define bool _Bool | |
104 | +#endif | |
105 | +#ifndef false | |
106 | +#define false 0 | |
107 | +#endif | |
108 | +#ifndef true | |
109 | +#define true 1 | |
110 | +#endif | |
111 | + | |
112 | +#ifndef __user | |
113 | +#define __user | |
114 | +#endif | |
115 | + | |
116 | +#ifndef current_uid | |
117 | +#define current_uid() (current->uid) | |
118 | +#endif | |
119 | +#ifndef current_gid | |
120 | +#define current_gid() (current->gid) | |
121 | +#endif | |
122 | +#ifndef current_euid | |
123 | +#define current_euid() (current->euid) | |
124 | +#endif | |
125 | +#ifndef current_egid | |
126 | +#define current_egid() (current->egid) | |
127 | +#endif | |
128 | +#ifndef current_suid | |
129 | +#define current_suid() (current->suid) | |
130 | +#endif | |
131 | +#ifndef current_sgid | |
132 | +#define current_sgid() (current->sgid) | |
133 | +#endif | |
134 | +#ifndef current_fsuid | |
135 | +#define current_fsuid() (current->fsuid) | |
136 | +#endif | |
137 | +#ifndef current_fsgid | |
138 | +#define current_fsgid() (current->fsgid) | |
139 | +#endif | |
140 | + | |
141 | +#ifndef DEFINE_SPINLOCK | |
142 | +#define DEFINE_SPINLOCK(x) spinlock_t x = SPIN_LOCK_UNLOCKED | |
143 | +#endif | |
144 | + | |
145 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16) | |
146 | +#define mutex semaphore | |
147 | +#define mutex_init(mutex) init_MUTEX(mutex) | |
148 | +#define mutex_unlock(mutex) up(mutex) | |
149 | +#define mutex_lock(mutex) down(mutex) | |
150 | +#define mutex_lock_interruptible(mutex) down_interruptible(mutex) | |
151 | +#define mutex_trylock(mutex) (!down_trylock(mutex)) | |
152 | +#define DEFINE_MUTEX(mutexname) DECLARE_MUTEX(mutexname) | |
153 | +#endif | |
154 | + | |
155 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 15) | |
156 | +#define MS_UNBINDABLE (1<<17) /* change to unbindable */ | |
157 | +#define MS_PRIVATE (1<<18) /* change to private */ | |
158 | +#define MS_SLAVE (1<<19) /* change to slave */ | |
159 | +#define MS_SHARED (1<<20) /* change to shared */ | |
160 | +#endif | |
161 | + | |
162 | +#ifndef container_of | |
163 | +#define container_of(ptr, type, member) ({ \ | |
164 | + const typeof(((type *)0)->member) *__mptr = (ptr); \ | |
165 | + (type *)((char *)__mptr - offsetof(type, member)); }) | |
166 | +#endif | |
167 | + | |
168 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) | |
169 | +#define smp_read_barrier_depends smp_rmb | |
170 | +#endif | |
171 | + | |
172 | +#ifndef ACCESS_ONCE | |
173 | +#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) | |
174 | +#endif | |
175 | + | |
176 | +#ifndef rcu_dereference | |
177 | +#define rcu_dereference(p) ({ \ | |
178 | + typeof(p) _________p1 = ACCESS_ONCE(p); \ | |
179 | + smp_read_barrier_depends(); /* see RCU */ \ | |
180 | + (_________p1); \ | |
181 | + }) | |
182 | +#endif | |
183 | + | |
184 | +#ifndef rcu_assign_pointer | |
185 | +#define rcu_assign_pointer(p, v) \ | |
186 | + ({ \ | |
187 | + if (!__builtin_constant_p(v) || \ | |
188 | + ((v) != NULL)) \ | |
189 | + smp_wmb(); /* see RCU */ \ | |
190 | + (p) = (v); \ | |
191 | + }) | |
192 | +#endif | |
193 | + | |
194 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0) | |
195 | +#define f_vfsmnt f_path.mnt | |
196 | +#endif | |
197 | + | |
198 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0) | |
199 | +#define d_inode(dentry) (dentry)->d_inode | |
200 | +#endif | |
201 | + | |
202 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 14) | |
203 | + | |
204 | +/** | |
205 | + * kzalloc() - Allocate memory. The memory is set to zero. | |
206 | + * | |
207 | + * @size: Size to allocate. | |
208 | + * @flags: GFP flags. | |
209 | + * | |
210 | + * Returns pointer to allocated memory on success, NULL otherwise. | |
211 | + * | |
212 | + * This is for compatibility with older kernels. | |
213 | + * | |
214 | + * Since several distributions backported kzalloc(), I define it as a macro | |
215 | + * rather than an inlined function in order to avoid multiple definition error. | |
216 | + */ | |
217 | +#define kzalloc(size, flags) ({ \ | |
218 | + void *ret = kmalloc((size), (flags)); \ | |
219 | + if (ret) \ | |
220 | + memset(ret, 0, (size)); \ | |
221 | + ret; }) | |
222 | + | |
223 | +#endif | |
224 | + | |
225 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25) | |
226 | + | |
227 | +/** | |
228 | + * path_put - Drop reference on "struct path". | |
229 | + * | |
230 | + * @path: Pointer to "struct path". | |
231 | + * | |
232 | + * Returns nothing. | |
233 | + * | |
234 | + * This is for compatibility with older kernels. | |
235 | + */ | |
236 | +static inline void path_put(struct path *path) | |
237 | +{ | |
238 | + dput(path->dentry); | |
239 | + mntput(path->mnt); | |
240 | +} | |
241 | + | |
242 | +#endif | |
243 | + | |
244 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) | |
245 | + | |
246 | +/** | |
247 | + * __list_add_rcu - Insert a new entry between two known consecutive entries. | |
248 | + * | |
249 | + * @new: Pointer to "struct list_head". | |
250 | + * @prev: Pointer to "struct list_head". | |
251 | + * @next: Pointer to "struct list_head". | |
252 | + * | |
253 | + * Returns nothing. | |
254 | + * | |
255 | + * This is for compatibility with older kernels. | |
256 | + */ | |
257 | +static inline void __list_add_rcu(struct list_head *new, | |
258 | + struct list_head *prev, | |
259 | + struct list_head *next) | |
260 | +{ | |
261 | + new->next = next; | |
262 | + new->prev = prev; | |
263 | + rcu_assign_pointer(prev->next, new); | |
264 | + next->prev = new; | |
265 | +} | |
266 | + | |
267 | +/** | |
268 | + * list_add_tail_rcu - Add a new entry to rcu-protected list. | |
269 | + * | |
270 | + * @new: Pointer to "struct list_head". | |
271 | + * @head: Pointer to "struct list_head". | |
272 | + * | |
273 | + * Returns nothing. | |
274 | + * | |
275 | + * This is for compatibility with older kernels. | |
276 | + */ | |
277 | +static inline void list_add_tail_rcu(struct list_head *new, | |
278 | + struct list_head *head) | |
279 | +{ | |
280 | + __list_add_rcu(new, head->prev, head); | |
281 | +} | |
282 | + | |
283 | +/** | |
284 | + * list_add_rcu - Add a new entry to rcu-protected list. | |
285 | + * | |
286 | + * @new: Pointer to "struct list_head". | |
287 | + * @head: Pointer to "struct list_head". | |
288 | + * | |
289 | + * Returns nothing. | |
290 | + * | |
291 | + * This is for compatibility with older kernels. | |
292 | + */ | |
293 | +static inline void list_add_rcu(struct list_head *new, struct list_head *head) | |
294 | +{ | |
295 | + __list_add_rcu(new, head, head->next); | |
296 | +} | |
297 | + | |
298 | +#endif | |
299 | + | |
300 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 38) | |
301 | + | |
302 | +/** | |
303 | + * __list_del_entry - Deletes entry from list without re-initialization. | |
304 | + * | |
305 | + * @entry: Pointer to "struct list_head". | |
306 | + * | |
307 | + * Returns nothing. | |
308 | + * | |
309 | + * This is for compatibility with older kernels. | |
310 | + */ | |
311 | +static inline void __list_del_entry(struct list_head *entry) | |
312 | +{ | |
313 | + __list_del(entry->prev, entry->next); | |
314 | +} | |
315 | + | |
316 | +#endif | |
317 | + | |
318 | +#ifndef list_for_each_entry_safe | |
319 | + | |
320 | +/** | |
321 | + * list_for_each_entry_safe - Iterate over list of given type safe against removal of list entry. | |
322 | + * | |
323 | + * @pos: The "type *" to use as a loop cursor. | |
324 | + * @n: Another "type *" to use as temporary storage. | |
325 | + * @head: Pointer to "struct list_head". | |
326 | + * @member: The name of the list_struct within the struct. | |
327 | + * | |
328 | + * This is for compatibility with older kernels. | |
329 | + */ | |
330 | +#define list_for_each_entry_safe(pos, n, head, member) \ | |
331 | + for (pos = list_entry((head)->next, typeof(*pos), member), \ | |
332 | + n = list_entry(pos->member.next, typeof(*pos), member); \ | |
333 | + &pos->member != (head); \ | |
334 | + pos = n, n = list_entry(n->member.next, typeof(*n), member)) | |
335 | + | |
336 | +#endif | |
337 | + | |
338 | +#ifndef srcu_dereference | |
339 | + | |
340 | +/** | |
341 | + * srcu_dereference - Fetch SRCU-protected pointer with checking. | |
342 | + * | |
343 | + * @p: The pointer to read, prior to dereferencing. | |
344 | + * @ss: Pointer to "struct srcu_struct". | |
345 | + * | |
346 | + * Returns @p. | |
347 | + * | |
348 | + * This is for compatibility with older kernels. | |
349 | + */ | |
350 | +#define srcu_dereference(p, ss) rcu_dereference(p) | |
351 | + | |
352 | +#endif | |
353 | + | |
354 | +#ifndef list_for_each_entry_srcu | |
355 | + | |
356 | +/** | |
357 | + * list_for_each_entry_srcu - Iterate over rcu list of given type. | |
358 | + * | |
359 | + * @pos: The type * to use as a loop cursor. | |
360 | + * @head: The head for your list. | |
361 | + * @member: The name of the list_struct within the struct. | |
362 | + * @ss: Pointer to "struct srcu_struct". | |
363 | + * | |
364 | + * As of 2.6.36, this macro is not provided because only TOMOYO wants it. | |
365 | + */ | |
366 | +#define list_for_each_entry_srcu(pos, head, member, ss) \ | |
367 | + for (pos = list_entry(srcu_dereference((head)->next, ss), \ | |
368 | + typeof(*pos), member); \ | |
369 | + prefetch(pos->member.next), &pos->member != (head); \ | |
370 | + pos = list_entry(srcu_dereference(pos->member.next, ss), \ | |
371 | + typeof(*pos), member)) | |
372 | + | |
373 | +#endif | |
374 | + | |
375 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 4, 30) || (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) && LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 9)) | |
376 | + | |
377 | +#if LINUX_VERSION_CODE == KERNEL_VERSION(2, 4, 21) | |
378 | +#undef ssleep | |
379 | +#endif | |
380 | + | |
381 | +#ifndef ssleep | |
382 | + | |
383 | +/** | |
384 | + * ssleep - Sleep for specified seconds. | |
385 | + * | |
386 | + * @secs: Seconds to sleep. | |
387 | + * | |
388 | + * Returns nothing. | |
389 | + * | |
390 | + * This is for compatibility with older kernels. | |
391 | + * | |
392 | + * Since several distributions backported ssleep(), I define it as a macro | |
393 | + * rather than an inlined function in order to avoid multiple definition error. | |
394 | + */ | |
395 | +#define ssleep(secs) { \ | |
396 | + set_current_state(TASK_UNINTERRUPTIBLE); \ | |
397 | + schedule_timeout((HZ * secs) + 1); \ | |
398 | + } | |
399 | + | |
400 | +#endif | |
401 | + | |
402 | +#endif | |
403 | + | |
404 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 5, 0) | |
405 | + | |
406 | +/** | |
407 | + * from_kuid - Convert kuid_t to uid_t. | |
408 | + * | |
409 | + * @ns: Unused. | |
410 | + * @uid: kuid_t value. | |
411 | + * | |
412 | + * Returns uid seen from init's user namespace. | |
413 | + */ | |
414 | +#define from_kuid(ns, uid) (uid) | |
415 | + | |
416 | +/** | |
417 | + * from_kgid - Convert kgid_t to gid_t. | |
418 | + * | |
419 | + * @ns: Unused. | |
420 | + * @gid: kgid_t value. | |
421 | + * | |
422 | + * Returns gid seen from init's user namespace. | |
423 | + */ | |
424 | +#define from_kgid(ns, gid) (gid) | |
425 | + | |
426 | +/** | |
427 | + * uid_eq - Check whether the uids are equals or not. | |
428 | + * | |
429 | + * @left: Uid seen from current user namespace. | |
430 | + * @right: Uid seen from current user namespace. | |
431 | + * | |
432 | + * Returns true if uid is root in init's user namespace, false otherwise. | |
433 | + */ | |
434 | +#define uid_eq(left, right) ((left) == (right)) | |
435 | +#define GLOBAL_ROOT_UID 0 | |
436 | + | |
437 | +#endif | |
438 | + | |
439 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0) | |
440 | +#define d_backing_inode(upper) (upper)->d_inode | |
441 | +#endif | |
442 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0) | |
443 | +#define d_is_dir(dentry) ({ struct inode *inode = d_backing_inode(dentry); \ | |
444 | + inode && S_ISDIR(inode->i_mode); }) | |
445 | +#endif | |
446 | + | |
447 | +/* | |
448 | + * TOMOYO specific part start. | |
449 | + */ | |
450 | + | |
451 | +/* Clear TOMOYO 1.8 config. */ | |
452 | +#undef CONFIG_CCSECURITY | |
453 | +#undef CONFIG_CCSECURITY_LKM | |
454 | +#undef CONFIG_CCSECURITY_DISABLE_BY_DEFAULT | |
455 | +#undef CONFIG_CCSECURITY_MAX_AUDIT_LOG | |
456 | +#undef CONFIG_CCSECURITY_MAX_ACCEPT_ENTRY | |
457 | +#undef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
458 | +#undef CONFIG_CCSECURITY_POLICY_LOADER | |
459 | +#undef CONFIG_CCSECURITY_ACTIVATION_TRIGGER | |
460 | +#undef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
461 | +#undef CONFIG_CCSECURITY_FILE_READDIR | |
462 | +#undef CONFIG_CCSECURITY_FILE_GETATTR | |
463 | +#undef CONFIG_CCSECURITY_NETWORK | |
464 | +#undef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
465 | +#undef CONFIG_CCSECURITY_CAPABILITY | |
466 | +#undef CONFIG_CCSECURITY_IPC | |
467 | +#undef CONFIG_CCSECURITY_MISC | |
468 | +#undef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
469 | +#undef CONFIG_CCSECURITY_TASK_DOMAIN_TRANSITION | |
470 | +#undef CONFIG_CCSECURITY_PORTRESERVE | |
471 | +/* Define AKARI 1.0 config. */ | |
472 | +#include "config.h" | |
473 | +#ifndef CONFIG_CCSECURITY | |
474 | +#define CONFIG_CCSECURITY | |
475 | +#endif | |
476 | +#ifndef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
477 | +#define CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
478 | +#endif | |
479 | +#ifndef CONFIG_CCSECURITY_MAX_AUDIT_LOG | |
480 | +#define CONFIG_CCSECURITY_MAX_AUDIT_LOG 1024 | |
481 | +#endif | |
482 | +#ifndef CONFIG_CCSECURITY_MAX_ACCEPT_ENTRY | |
483 | +#define CONFIG_CCSECURITY_MAX_ACCEPT_ENTRY 2048 | |
484 | +#endif | |
485 | +#ifndef CONFIG_CCSECURITY_POLICY_LOADER | |
486 | +#define CONFIG_CCSECURITY_POLICY_LOADER "/sbin/ccs-init" | |
487 | +#endif | |
488 | +#ifndef CONFIG_CCSECURITY_ACTIVATION_TRIGGER | |
489 | +#define CONFIG_CCSECURITY_ACTIVATION_TRIGGER "/sbin/init" | |
490 | +#endif | |
491 | +#include "ccsecurity.h" | |
492 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) | |
493 | +#error This module supports only 2.6.0 and later kernels. | |
494 | +#endif | |
495 | +#ifndef CONFIG_SECURITY | |
496 | +#error You must choose CONFIG_SECURITY=y for building this module. | |
497 | +#endif | |
498 | +#ifndef CONFIG_KALLSYMS | |
499 | +#error You must choose CONFIG_KALLSYMS=y for building this module. | |
500 | +#endif | |
501 | +#ifndef CONFIG_PROC_FS | |
502 | +#error You must choose CONFIG_PROC_FS=y for building this module. | |
503 | +#endif | |
504 | +#ifndef CONFIG_MODULES | |
505 | +#error You must choose CONFIG_MODULES=y for building this module. | |
506 | +#endif | |
507 | + | |
508 | +/* Enumeration definition for internal use. */ | |
509 | + | |
510 | +/* Index numbers for Access Controls. */ | |
511 | +enum ccs_acl_entry_type_index { | |
512 | + CCS_TYPE_PATH_ACL, | |
513 | + CCS_TYPE_PATH2_ACL, | |
514 | + CCS_TYPE_PATH_NUMBER_ACL, | |
515 | + CCS_TYPE_MKDEV_ACL, | |
516 | + CCS_TYPE_MOUNT_ACL, | |
517 | +#ifdef CONFIG_CCSECURITY_MISC | |
518 | + CCS_TYPE_ENV_ACL, | |
519 | +#endif | |
520 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
521 | + CCS_TYPE_CAPABILITY_ACL, | |
522 | +#endif | |
523 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
524 | + CCS_TYPE_INET_ACL, | |
525 | + CCS_TYPE_UNIX_ACL, | |
526 | +#endif | |
527 | +#ifdef CONFIG_CCSECURITY_IPC | |
528 | + CCS_TYPE_SIGNAL_ACL, | |
529 | +#endif | |
530 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
531 | + CCS_TYPE_AUTO_EXECUTE_HANDLER, | |
532 | + CCS_TYPE_DENIED_EXECUTE_HANDLER, | |
533 | +#endif | |
534 | +#ifdef CONFIG_CCSECURITY_TASK_DOMAIN_TRANSITION | |
535 | + CCS_TYPE_AUTO_TASK_ACL, | |
536 | + CCS_TYPE_MANUAL_TASK_ACL, | |
537 | +#endif | |
538 | +}; | |
539 | + | |
540 | +/* Index numbers for "struct ccs_condition". */ | |
541 | +enum ccs_conditions_index { | |
542 | + CCS_TASK_UID, /* current_uid() */ | |
543 | + CCS_TASK_EUID, /* current_euid() */ | |
544 | + CCS_TASK_SUID, /* current_suid() */ | |
545 | + CCS_TASK_FSUID, /* current_fsuid() */ | |
546 | + CCS_TASK_GID, /* current_gid() */ | |
547 | + CCS_TASK_EGID, /* current_egid() */ | |
548 | + CCS_TASK_SGID, /* current_sgid() */ | |
549 | + CCS_TASK_FSGID, /* current_fsgid() */ | |
550 | + CCS_TASK_PID, /* sys_getpid() */ | |
551 | + CCS_TASK_PPID, /* sys_getppid() */ | |
552 | + CCS_EXEC_ARGC, /* "struct linux_binprm *"->argc */ | |
553 | + CCS_EXEC_ENVC, /* "struct linux_binprm *"->envc */ | |
554 | + CCS_TYPE_IS_SOCKET, /* S_IFSOCK */ | |
555 | + CCS_TYPE_IS_SYMLINK, /* S_IFLNK */ | |
556 | + CCS_TYPE_IS_FILE, /* S_IFREG */ | |
557 | + CCS_TYPE_IS_BLOCK_DEV, /* S_IFBLK */ | |
558 | + CCS_TYPE_IS_DIRECTORY, /* S_IFDIR */ | |
559 | + CCS_TYPE_IS_CHAR_DEV, /* S_IFCHR */ | |
560 | + CCS_TYPE_IS_FIFO, /* S_IFIFO */ | |
561 | + CCS_MODE_SETUID, /* S_ISUID */ | |
562 | + CCS_MODE_SETGID, /* S_ISGID */ | |
563 | + CCS_MODE_STICKY, /* S_ISVTX */ | |
564 | + CCS_MODE_OWNER_READ, /* S_IRUSR */ | |
565 | + CCS_MODE_OWNER_WRITE, /* S_IWUSR */ | |
566 | + CCS_MODE_OWNER_EXECUTE, /* S_IXUSR */ | |
567 | + CCS_MODE_GROUP_READ, /* S_IRGRP */ | |
568 | + CCS_MODE_GROUP_WRITE, /* S_IWGRP */ | |
569 | + CCS_MODE_GROUP_EXECUTE, /* S_IXGRP */ | |
570 | + CCS_MODE_OTHERS_READ, /* S_IROTH */ | |
571 | + CCS_MODE_OTHERS_WRITE, /* S_IWOTH */ | |
572 | + CCS_MODE_OTHERS_EXECUTE, /* S_IXOTH */ | |
573 | + CCS_TASK_TYPE, /* ((u8) task->ccs_flags) & | |
574 | + CCS_TASK_IS_EXECUTE_HANDLER */ | |
575 | + CCS_TASK_EXECUTE_HANDLER, /* CCS_TASK_IS_EXECUTE_HANDLER */ | |
576 | + CCS_EXEC_REALPATH, | |
577 | + CCS_SYMLINK_TARGET, | |
578 | + CCS_PATH1_UID, | |
579 | + CCS_PATH1_GID, | |
580 | + CCS_PATH1_INO, | |
581 | + CCS_PATH1_MAJOR, | |
582 | + CCS_PATH1_MINOR, | |
583 | + CCS_PATH1_PERM, | |
584 | + CCS_PATH1_TYPE, | |
585 | + CCS_PATH1_DEV_MAJOR, | |
586 | + CCS_PATH1_DEV_MINOR, | |
587 | + CCS_PATH2_UID, | |
588 | + CCS_PATH2_GID, | |
589 | + CCS_PATH2_INO, | |
590 | + CCS_PATH2_MAJOR, | |
591 | + CCS_PATH2_MINOR, | |
592 | + CCS_PATH2_PERM, | |
593 | + CCS_PATH2_TYPE, | |
594 | + CCS_PATH2_DEV_MAJOR, | |
595 | + CCS_PATH2_DEV_MINOR, | |
596 | + CCS_PATH1_PARENT_UID, | |
597 | + CCS_PATH1_PARENT_GID, | |
598 | + CCS_PATH1_PARENT_INO, | |
599 | + CCS_PATH1_PARENT_PERM, | |
600 | + CCS_PATH2_PARENT_UID, | |
601 | + CCS_PATH2_PARENT_GID, | |
602 | + CCS_PATH2_PARENT_INO, | |
603 | + CCS_PATH2_PARENT_PERM, | |
604 | + CCS_MAX_CONDITION_KEYWORD, | |
605 | + CCS_NUMBER_UNION, | |
606 | + CCS_NAME_UNION, | |
607 | + CCS_ARGV_ENTRY, | |
608 | + CCS_ENVP_ENTRY, | |
609 | +}; | |
610 | + | |
611 | +/* Index numbers for domain's attributes. */ | |
612 | +enum ccs_domain_info_flags_index { | |
613 | + /* Quota warnning flag. */ | |
614 | + CCS_DIF_QUOTA_WARNED, | |
615 | + /* | |
616 | + * This domain was unable to create a new domain at | |
617 | + * ccs_find_next_domain() because the name of the domain to be created | |
618 | + * was too long or it could not allocate memory. | |
619 | + * More than one process continued execve() without domain transition. | |
620 | + */ | |
621 | + CCS_DIF_TRANSITION_FAILED, | |
622 | + CCS_MAX_DOMAIN_INFO_FLAGS | |
623 | +}; | |
624 | + | |
625 | +/* Index numbers for audit type. */ | |
626 | +enum ccs_grant_log { | |
627 | + /* Follow profile's configuration. */ | |
628 | + CCS_GRANTLOG_AUTO, | |
629 | + /* Do not generate grant log. */ | |
630 | + CCS_GRANTLOG_NO, | |
631 | + /* Generate grant_log. */ | |
632 | + CCS_GRANTLOG_YES, | |
633 | +}; | |
634 | + | |
635 | +/* Index numbers for group entries. */ | |
636 | +enum ccs_group_id { | |
637 | + CCS_PATH_GROUP, | |
638 | + CCS_NUMBER_GROUP, | |
639 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
640 | + CCS_ADDRESS_GROUP, | |
641 | +#endif | |
642 | + CCS_MAX_GROUP | |
643 | +}; | |
644 | + | |
645 | +/* Index numbers for category of functionality. */ | |
646 | +enum ccs_mac_category_index { | |
647 | + CCS_MAC_CATEGORY_FILE, | |
648 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
649 | + CCS_MAC_CATEGORY_NETWORK, | |
650 | +#endif | |
651 | +#ifdef CONFIG_CCSECURITY_MISC | |
652 | + CCS_MAC_CATEGORY_MISC, | |
653 | +#endif | |
654 | +#ifdef CONFIG_CCSECURITY_IPC | |
655 | + CCS_MAC_CATEGORY_IPC, | |
656 | +#endif | |
657 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
658 | + CCS_MAC_CATEGORY_CAPABILITY, | |
659 | +#endif | |
660 | + CCS_MAX_MAC_CATEGORY_INDEX | |
661 | +}; | |
662 | + | |
663 | +/* Index numbers for functionality. */ | |
664 | +enum ccs_mac_index { | |
665 | + CCS_MAC_FILE_EXECUTE, | |
666 | + CCS_MAC_FILE_OPEN, | |
667 | + CCS_MAC_FILE_CREATE, | |
668 | + CCS_MAC_FILE_UNLINK, | |
669 | +#ifdef CONFIG_CCSECURITY_FILE_GETATTR | |
670 | + CCS_MAC_FILE_GETATTR, | |
671 | +#endif | |
672 | + CCS_MAC_FILE_MKDIR, | |
673 | + CCS_MAC_FILE_RMDIR, | |
674 | + CCS_MAC_FILE_MKFIFO, | |
675 | + CCS_MAC_FILE_MKSOCK, | |
676 | + CCS_MAC_FILE_TRUNCATE, | |
677 | + CCS_MAC_FILE_SYMLINK, | |
678 | + CCS_MAC_FILE_MKBLOCK, | |
679 | + CCS_MAC_FILE_MKCHAR, | |
680 | + CCS_MAC_FILE_LINK, | |
681 | + CCS_MAC_FILE_RENAME, | |
682 | + CCS_MAC_FILE_CHMOD, | |
683 | + CCS_MAC_FILE_CHOWN, | |
684 | + CCS_MAC_FILE_CHGRP, | |
685 | + CCS_MAC_FILE_IOCTL, | |
686 | + CCS_MAC_FILE_CHROOT, | |
687 | + CCS_MAC_FILE_MOUNT, | |
688 | + CCS_MAC_FILE_UMOUNT, | |
689 | + CCS_MAC_FILE_PIVOT_ROOT, | |
690 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
691 | + CCS_MAC_NETWORK_INET_STREAM_BIND, | |
692 | + CCS_MAC_NETWORK_INET_STREAM_LISTEN, | |
693 | + CCS_MAC_NETWORK_INET_STREAM_CONNECT, | |
694 | + CCS_MAC_NETWORK_INET_STREAM_ACCEPT, | |
695 | + CCS_MAC_NETWORK_INET_DGRAM_BIND, | |
696 | + CCS_MAC_NETWORK_INET_DGRAM_SEND, | |
697 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
698 | + CCS_MAC_NETWORK_INET_DGRAM_RECV, | |
699 | +#endif | |
700 | + CCS_MAC_NETWORK_INET_RAW_BIND, | |
701 | + CCS_MAC_NETWORK_INET_RAW_SEND, | |
702 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
703 | + CCS_MAC_NETWORK_INET_RAW_RECV, | |
704 | +#endif | |
705 | + CCS_MAC_NETWORK_UNIX_STREAM_BIND, | |
706 | + CCS_MAC_NETWORK_UNIX_STREAM_LISTEN, | |
707 | + CCS_MAC_NETWORK_UNIX_STREAM_CONNECT, | |
708 | + CCS_MAC_NETWORK_UNIX_STREAM_ACCEPT, | |
709 | + CCS_MAC_NETWORK_UNIX_DGRAM_BIND, | |
710 | + CCS_MAC_NETWORK_UNIX_DGRAM_SEND, | |
711 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
712 | + CCS_MAC_NETWORK_UNIX_DGRAM_RECV, | |
713 | +#endif | |
714 | + CCS_MAC_NETWORK_UNIX_SEQPACKET_BIND, | |
715 | + CCS_MAC_NETWORK_UNIX_SEQPACKET_LISTEN, | |
716 | + CCS_MAC_NETWORK_UNIX_SEQPACKET_CONNECT, | |
717 | + CCS_MAC_NETWORK_UNIX_SEQPACKET_ACCEPT, | |
718 | +#endif | |
719 | +#ifdef CONFIG_CCSECURITY_MISC | |
720 | + CCS_MAC_ENVIRON, | |
721 | +#endif | |
722 | +#ifdef CONFIG_CCSECURITY_IPC | |
723 | + CCS_MAC_SIGNAL, | |
724 | +#endif | |
725 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
726 | + CCS_MAC_CAPABILITY_USE_ROUTE_SOCKET, | |
727 | + CCS_MAC_CAPABILITY_USE_PACKET_SOCKET, | |
728 | + CCS_MAC_CAPABILITY_SYS_REBOOT, | |
729 | + CCS_MAC_CAPABILITY_SYS_VHANGUP, | |
730 | + CCS_MAC_CAPABILITY_SYS_SETTIME, | |
731 | + CCS_MAC_CAPABILITY_SYS_NICE, | |
732 | + CCS_MAC_CAPABILITY_SYS_SETHOSTNAME, | |
733 | + CCS_MAC_CAPABILITY_USE_KERNEL_MODULE, | |
734 | + CCS_MAC_CAPABILITY_SYS_KEXEC_LOAD, | |
735 | + CCS_MAC_CAPABILITY_SYS_PTRACE, | |
736 | +#endif | |
737 | + CCS_MAX_MAC_INDEX | |
738 | +}; | |
739 | + | |
740 | +/* Index numbers for /proc/ccs/stat interface. */ | |
741 | +enum ccs_memory_stat_type { | |
742 | + CCS_MEMORY_POLICY, | |
743 | + CCS_MEMORY_AUDIT, | |
744 | + CCS_MEMORY_QUERY, | |
745 | + CCS_MAX_MEMORY_STAT | |
746 | +}; | |
747 | + | |
748 | +/* Index numbers for access controls with one pathname and three numbers. */ | |
749 | +enum ccs_mkdev_acl_index { | |
750 | + CCS_TYPE_MKBLOCK, | |
751 | + CCS_TYPE_MKCHAR, | |
752 | + CCS_MAX_MKDEV_OPERATION | |
753 | +}; | |
754 | + | |
755 | +/* Index numbers for operation mode. */ | |
756 | +enum ccs_mode_value { | |
757 | + CCS_CONFIG_DISABLED, | |
758 | + CCS_CONFIG_LEARNING, | |
759 | + CCS_CONFIG_PERMISSIVE, | |
760 | + CCS_CONFIG_ENFORCING, | |
761 | + CCS_CONFIG_MAX_MODE, | |
762 | + CCS_CONFIG_WANT_REJECT_LOG = 64, | |
763 | + CCS_CONFIG_WANT_GRANT_LOG = 128, | |
764 | + CCS_CONFIG_USE_DEFAULT = 255, | |
765 | +}; | |
766 | + | |
767 | +/* Index numbers for socket operations. */ | |
768 | +enum ccs_network_acl_index { | |
769 | + CCS_NETWORK_BIND, /* bind() operation. */ | |
770 | + CCS_NETWORK_LISTEN, /* listen() operation. */ | |
771 | + CCS_NETWORK_CONNECT, /* connect() operation. */ | |
772 | + CCS_NETWORK_ACCEPT, /* accept() operation. */ | |
773 | + CCS_NETWORK_SEND, /* send() operation. */ | |
774 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
775 | + CCS_NETWORK_RECV, /* recv() operation. */ | |
776 | +#endif | |
777 | + CCS_MAX_NETWORK_OPERATION | |
778 | +}; | |
779 | + | |
780 | +/* Index numbers for access controls with two pathnames. */ | |
781 | +enum ccs_path2_acl_index { | |
782 | + CCS_TYPE_LINK, | |
783 | + CCS_TYPE_RENAME, | |
784 | + CCS_TYPE_PIVOT_ROOT, | |
785 | + CCS_MAX_PATH2_OPERATION | |
786 | +}; | |
787 | + | |
788 | +/* Index numbers for access controls with one pathname. */ | |
789 | +enum ccs_path_acl_index { | |
790 | + CCS_TYPE_EXECUTE, | |
791 | + CCS_TYPE_READ, | |
792 | + CCS_TYPE_WRITE, | |
793 | + CCS_TYPE_APPEND, | |
794 | + CCS_TYPE_UNLINK, | |
795 | +#ifdef CONFIG_CCSECURITY_FILE_GETATTR | |
796 | + CCS_TYPE_GETATTR, | |
797 | +#endif | |
798 | + CCS_TYPE_RMDIR, | |
799 | + CCS_TYPE_TRUNCATE, | |
800 | + CCS_TYPE_SYMLINK, | |
801 | + CCS_TYPE_CHROOT, | |
802 | + CCS_TYPE_UMOUNT, | |
803 | + CCS_MAX_PATH_OPERATION | |
804 | +}; | |
805 | + | |
806 | +/* Index numbers for access controls with one pathname and one number. */ | |
807 | +enum ccs_path_number_acl_index { | |
808 | + CCS_TYPE_CREATE, | |
809 | + CCS_TYPE_MKDIR, | |
810 | + CCS_TYPE_MKFIFO, | |
811 | + CCS_TYPE_MKSOCK, | |
812 | + CCS_TYPE_IOCTL, | |
813 | + CCS_TYPE_CHMOD, | |
814 | + CCS_TYPE_CHOWN, | |
815 | + CCS_TYPE_CHGRP, | |
816 | + CCS_MAX_PATH_NUMBER_OPERATION | |
817 | +}; | |
818 | + | |
819 | +/* Index numbers for stat(). */ | |
820 | +enum ccs_path_stat_index { | |
821 | + /* Do not change this order. */ | |
822 | + CCS_PATH1, | |
823 | + CCS_PATH1_PARENT, | |
824 | + CCS_PATH2, | |
825 | + CCS_PATH2_PARENT, | |
826 | + CCS_MAX_PATH_STAT | |
827 | +}; | |
828 | + | |
829 | +/* Index numbers for entry type. */ | |
830 | +enum ccs_policy_id { | |
831 | +#ifdef CONFIG_CCSECURITY_PORTRESERVE | |
832 | + CCS_ID_RESERVEDPORT, | |
833 | +#endif | |
834 | + CCS_ID_GROUP, | |
835 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
836 | + CCS_ID_ADDRESS_GROUP, | |
837 | +#endif | |
838 | + CCS_ID_PATH_GROUP, | |
839 | + CCS_ID_NUMBER_GROUP, | |
840 | + CCS_ID_AGGREGATOR, | |
841 | + CCS_ID_TRANSITION_CONTROL, | |
842 | + CCS_ID_MANAGER, | |
843 | + CCS_ID_CONDITION, | |
844 | + CCS_ID_NAME, | |
845 | + CCS_ID_ACL, | |
846 | + CCS_ID_DOMAIN, | |
847 | + CCS_MAX_POLICY | |
848 | +}; | |
849 | + | |
850 | +/* Index numbers for /proc/ccs/stat interface. */ | |
851 | +enum ccs_policy_stat_type { | |
852 | + /* Do not change this order. */ | |
853 | + CCS_STAT_POLICY_UPDATES, | |
854 | + CCS_STAT_POLICY_LEARNING, /* == CCS_CONFIG_LEARNING */ | |
855 | + CCS_STAT_POLICY_PERMISSIVE, /* == CCS_CONFIG_PERMISSIVE */ | |
856 | + CCS_STAT_POLICY_ENFORCING, /* == CCS_CONFIG_ENFORCING */ | |
857 | + CCS_MAX_POLICY_STAT | |
858 | +}; | |
859 | + | |
860 | +/* Index numbers for profile's PREFERENCE values. */ | |
861 | +enum ccs_pref_index { | |
862 | + CCS_PREF_MAX_AUDIT_LOG, | |
863 | + CCS_PREF_MAX_LEARNING_ENTRY, | |
864 | + CCS_PREF_ENFORCING_PENALTY, | |
865 | + CCS_MAX_PREF | |
866 | +}; | |
867 | + | |
868 | +/* Index numbers for /proc/ccs/ interfaces. */ | |
869 | +enum ccs_proc_interface_index { | |
870 | + CCS_DOMAIN_POLICY, | |
871 | + CCS_EXCEPTION_POLICY, | |
872 | + CCS_PROCESS_STATUS, | |
873 | + CCS_STAT, | |
874 | + CCS_AUDIT, | |
875 | + CCS_VERSION, | |
876 | + CCS_PROFILE, | |
877 | + CCS_QUERY, | |
878 | + CCS_MANAGER, | |
879 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
880 | + CCS_EXECUTE_HANDLER, | |
881 | +#endif | |
882 | +}; | |
883 | + | |
884 | +/* Index numbers for special mount operations. */ | |
885 | +enum ccs_special_mount { | |
886 | + CCS_MOUNT_BIND, /* mount --bind /source /dest */ | |
887 | + CCS_MOUNT_MOVE, /* mount --move /old /new */ | |
888 | + CCS_MOUNT_REMOUNT, /* mount -o remount /dir */ | |
889 | + CCS_MOUNT_MAKE_UNBINDABLE, /* mount --make-unbindable /dir */ | |
890 | + CCS_MOUNT_MAKE_PRIVATE, /* mount --make-private /dir */ | |
891 | + CCS_MOUNT_MAKE_SLAVE, /* mount --make-slave /dir */ | |
892 | + CCS_MOUNT_MAKE_SHARED, /* mount --make-shared /dir */ | |
893 | + CCS_MAX_SPECIAL_MOUNT | |
894 | +}; | |
895 | + | |
896 | +/* Index numbers for domain transition control keywords. */ | |
897 | +enum ccs_transition_type { | |
898 | + /* Do not change this order, */ | |
899 | + CCS_TRANSITION_CONTROL_NO_RESET, | |
900 | + CCS_TRANSITION_CONTROL_RESET, | |
901 | + CCS_TRANSITION_CONTROL_NO_INITIALIZE, | |
902 | + CCS_TRANSITION_CONTROL_INITIALIZE, | |
903 | + CCS_TRANSITION_CONTROL_NO_KEEP, | |
904 | + CCS_TRANSITION_CONTROL_KEEP, | |
905 | + CCS_MAX_TRANSITION_TYPE | |
906 | +}; | |
907 | + | |
908 | +/* Index numbers for type of numeric values. */ | |
909 | +enum ccs_value_type { | |
910 | + CCS_VALUE_TYPE_INVALID, | |
911 | + CCS_VALUE_TYPE_DECIMAL, | |
912 | + CCS_VALUE_TYPE_OCTAL, | |
913 | + CCS_VALUE_TYPE_HEXADECIMAL, | |
914 | +}; | |
915 | + | |
916 | +/* Constants definition for internal use. */ | |
917 | + | |
918 | +/* | |
919 | + * TOMOYO uses this hash only when appending a string into the string table. | |
920 | + * Frequency of appending strings is very low. So we don't need large (e.g. | |
921 | + * 64k) hash size. 256 will be sufficient. | |
922 | + */ | |
923 | +#define CCS_HASH_BITS 8 | |
924 | +#define CCS_MAX_HASH (1u << CCS_HASH_BITS) | |
925 | + | |
926 | +/* | |
927 | + * TOMOYO checks only SOCK_STREAM, SOCK_DGRAM, SOCK_RAW, SOCK_SEQPACKET. | |
928 | + * Therefore, we don't need SOCK_MAX. | |
929 | + */ | |
930 | +#define CCS_SOCK_MAX 6 | |
931 | + | |
932 | +/* Size of temporary buffer for execve() operation. */ | |
933 | +#define CCS_EXEC_TMPSIZE 4096 | |
934 | + | |
935 | +/* Garbage collector is trying to kfree() this element. */ | |
936 | +#define CCS_GC_IN_PROGRESS -1 | |
937 | + | |
938 | +/* Profile number is an integer between 0 and 255. */ | |
939 | +#define CCS_MAX_PROFILES 256 | |
940 | + | |
941 | +/* Group number is an integer between 0 and 255. */ | |
942 | +#define CCS_MAX_ACL_GROUPS 256 | |
943 | + | |
944 | +/* Current thread is doing open(O_RDONLY | O_TRUNC) ? */ | |
945 | +#define CCS_OPEN_FOR_READ_TRUNCATE 1 | |
946 | +/* Current thread is doing open(3) ? */ | |
947 | +#define CCS_OPEN_FOR_IOCTL_ONLY 2 | |
948 | +/* Current thread is doing do_execve() ? */ | |
949 | +#define CCS_TASK_IS_IN_EXECVE 4 | |
950 | +/* Current thread is running as an execute handler program? */ | |
951 | +#define CCS_TASK_IS_EXECUTE_HANDLER 8 | |
952 | +/* Current thread is allowed to modify policy via /proc/ccs/ interface? */ | |
953 | +#define CCS_TASK_IS_MANAGER 16 | |
954 | + | |
955 | +/* | |
956 | + * Retry this request. Returned by ccs_supervisor() if policy violation has | |
957 | + * occurred in enforcing mode and the userspace daemon decided to retry. | |
958 | + * | |
959 | + * We must choose a positive value in order to distinguish "granted" (which is | |
960 | + * 0) and "rejected" (which is a negative value) and "retry". | |
961 | + */ | |
962 | +#define CCS_RETRY_REQUEST 1 | |
963 | + | |
964 | +/* The gfp flags used by TOMOYO. */ | |
965 | +#define CCS_GFP_FLAGS GFP_NOFS | |
966 | + | |
967 | +/* Size of read buffer for /proc/ccs/ interface. */ | |
968 | +#define CCS_MAX_IO_READ_QUEUE 64 | |
969 | + | |
970 | +/* Structure definition for internal use. */ | |
971 | + | |
972 | +/* Common header for holding ACL entries. */ | |
973 | +struct ccs_acl_head { | |
974 | + struct list_head list; | |
975 | + s8 is_deleted; /* true or false or CCS_GC_IN_PROGRESS */ | |
976 | +} __packed; | |
977 | + | |
978 | +/* Common header for shared entries. */ | |
979 | +struct ccs_shared_acl_head { | |
980 | + struct list_head list; | |
981 | + atomic_t users; | |
982 | +} __packed; | |
983 | + | |
984 | +/* Common header for individual entries. */ | |
985 | +struct ccs_acl_info { | |
986 | + struct list_head list; | |
987 | + struct ccs_condition *cond; /* Maybe NULL. */ | |
988 | + s8 is_deleted; /* true or false or CCS_GC_IN_PROGRESS */ | |
989 | + u8 type; /* One of values in "enum ccs_acl_entry_type_index". */ | |
990 | + u16 perm; | |
991 | +} __packed; | |
992 | + | |
993 | +/* Structure for holding a word. */ | |
994 | +struct ccs_name_union { | |
995 | + /* Either @filename or @group is NULL. */ | |
996 | + const struct ccs_path_info *filename; | |
997 | + struct ccs_group *group; | |
998 | +}; | |
999 | + | |
1000 | +/* Structure for holding a number. */ | |
1001 | +struct ccs_number_union { | |
1002 | + unsigned long values[2]; | |
1003 | + struct ccs_group *group; /* Maybe NULL. */ | |
1004 | + /* One of values in "enum ccs_value_type". */ | |
1005 | + u8 value_type[2]; | |
1006 | +}; | |
1007 | + | |
1008 | +/* Structure for holding an IP address. */ | |
1009 | +struct ccs_ipaddr_union { | |
1010 | + struct in6_addr ip[2]; /* Big endian. */ | |
1011 | + struct ccs_group *group; /* Pointer to address group. */ | |
1012 | + bool is_ipv6; /* Valid only if @group == NULL. */ | |
1013 | +}; | |
1014 | + | |
1015 | +/* Structure for "path_group"/"number_group"/"address_group" directive. */ | |
1016 | +struct ccs_group { | |
1017 | + struct ccs_shared_acl_head head; | |
1018 | + /* Name of group (without leading '@'). */ | |
1019 | + const struct ccs_path_info *group_name; | |
1020 | + /* | |
1021 | + * List of "struct ccs_path_group" or "struct ccs_number_group" or | |
1022 | + * "struct ccs_address_group". | |
1023 | + */ | |
1024 | + struct list_head member_list; | |
1025 | +}; | |
1026 | + | |
1027 | +/* Structure for "path_group" directive. */ | |
1028 | +struct ccs_path_group { | |
1029 | + struct ccs_acl_head head; | |
1030 | + const struct ccs_path_info *member_name; | |
1031 | +}; | |
1032 | + | |
1033 | +/* Structure for "number_group" directive. */ | |
1034 | +struct ccs_number_group { | |
1035 | + struct ccs_acl_head head; | |
1036 | + struct ccs_number_union number; | |
1037 | +}; | |
1038 | + | |
1039 | +/* Structure for "address_group" directive. */ | |
1040 | +struct ccs_address_group { | |
1041 | + struct ccs_acl_head head; | |
1042 | + /* Structure for holding an IP address. */ | |
1043 | + struct ccs_ipaddr_union address; | |
1044 | +}; | |
1045 | + | |
1046 | +/* Subset of "struct stat". Used by conditional ACL and audit logs. */ | |
1047 | +struct ccs_mini_stat { | |
1048 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
1049 | + kuid_t uid; | |
1050 | + kgid_t gid; | |
1051 | +#else | |
1052 | + uid_t uid; | |
1053 | + gid_t gid; | |
1054 | +#endif | |
1055 | + ino_t ino; | |
1056 | + umode_t mode; | |
1057 | + dev_t dev; | |
1058 | + dev_t rdev; | |
1059 | +}; | |
1060 | + | |
1061 | +/* Structure for dumping argv[] and envp[] of "struct linux_binprm". */ | |
1062 | +struct ccs_page_dump { | |
1063 | + struct page *page; /* Previously dumped page. */ | |
1064 | + char *data; /* Contents of "page". Size is PAGE_SIZE. */ | |
1065 | +}; | |
1066 | + | |
1067 | +/* Structure for attribute checks in addition to pathname checks. */ | |
1068 | +struct ccs_obj_info { | |
1069 | + /* True if ccs_get_attributes() was already called, false otherwise. */ | |
1070 | + bool validate_done; | |
1071 | + /* True if @stat[] is valid. */ | |
1072 | + bool stat_valid[CCS_MAX_PATH_STAT]; | |
1073 | + /* First pathname. Initialized with { NULL, NULL } if no path. */ | |
1074 | + struct path path1; | |
1075 | + /* Second pathname. Initialized with { NULL, NULL } if no path. */ | |
1076 | + struct path path2; | |
1077 | + /* | |
1078 | + * Information on @path1, @path1's parent directory, @path2, @path2's | |
1079 | + * parent directory. | |
1080 | + */ | |
1081 | + struct ccs_mini_stat stat[CCS_MAX_PATH_STAT]; | |
1082 | + /* | |
1083 | + * Content of symbolic link to be created. NULL for operations other | |
1084 | + * than symlink(). | |
1085 | + */ | |
1086 | + struct ccs_path_info *symlink_target; | |
1087 | +}; | |
1088 | + | |
1089 | +/* Structure for entries which follows "struct ccs_condition". */ | |
1090 | +struct ccs_condition_element { | |
1091 | + /* | |
1092 | + * Left hand operand. A "struct ccs_argv" for CCS_ARGV_ENTRY, a | |
1093 | + * "struct ccs_envp" for CCS_ENVP_ENTRY is attached to the tail | |
1094 | + * of the array of this struct. | |
1095 | + */ | |
1096 | + u8 left; | |
1097 | + /* | |
1098 | + * Right hand operand. A "struct ccs_number_union" for | |
1099 | + * CCS_NUMBER_UNION, a "struct ccs_name_union" for CCS_NAME_UNION is | |
1100 | + * attached to the tail of the array of this struct. | |
1101 | + */ | |
1102 | + u8 right; | |
1103 | + /* Equation operator. True if equals or overlaps, false otherwise. */ | |
1104 | + bool equals; | |
1105 | +}; | |
1106 | + | |
1107 | +/* Structure for optional arguments. */ | |
1108 | +struct ccs_condition { | |
1109 | + struct ccs_shared_acl_head head; | |
1110 | + u32 size; /* Memory size allocated for this entry. */ | |
1111 | + u16 condc; /* Number of conditions in this struct. */ | |
1112 | + u16 numbers_count; /* Number of "struct ccs_number_union values". */ | |
1113 | + u16 names_count; /* Number of "struct ccs_name_union names". */ | |
1114 | + u16 argc; /* Number of "struct ccs_argv". */ | |
1115 | + u16 envc; /* Number of "struct ccs_envp". */ | |
1116 | + u8 grant_log; /* One of values in "enum ccs_grant_log". */ | |
1117 | + bool exec_transit; /* True if transit is for "file execute". */ | |
1118 | + const struct ccs_path_info *transit; /* Maybe NULL. */ | |
1119 | + /* | |
1120 | + * struct ccs_condition_element condition[condc]; | |
1121 | + * struct ccs_number_union values[numbers_count]; | |
1122 | + * struct ccs_name_union names[names_count]; | |
1123 | + * struct ccs_argv argv[argc]; | |
1124 | + * struct ccs_envp envp[envc]; | |
1125 | + */ | |
1126 | +}; | |
1127 | + | |
1128 | +struct ccs_execve; | |
1129 | +struct ccs_policy_namespace; | |
1130 | + | |
1131 | +/* Structure for request info. */ | |
1132 | +struct ccs_request_info { | |
1133 | + /* | |
1134 | + * For holding parameters specific to operations which deal files. | |
1135 | + * NULL if not dealing files. | |
1136 | + */ | |
1137 | + struct ccs_obj_info *obj; | |
1138 | + /* | |
1139 | + * For holding parameters specific to execve() request. | |
1140 | + * NULL if not dealing do_execve(). | |
1141 | + */ | |
1142 | + struct ccs_execve *ee; | |
1143 | + /* | |
1144 | + * For holding parameters. | |
1145 | + * Pointers in this union are not NULL except path->matched_path. | |
1146 | + */ | |
1147 | + union { | |
1148 | + struct { | |
1149 | + const struct ccs_path_info *filename; | |
1150 | + /* | |
1151 | + * For using wildcards at ccs_find_next_domain(). | |
1152 | + * | |
1153 | + * The matched_acl cannot be used because it may refer | |
1154 | + * a "struct ccs_path_acl" with ->is_group == true. | |
1155 | + * We want to use exact "struct ccs_path_info" rather | |
1156 | + * than "struct ccs_path_acl". | |
1157 | + */ | |
1158 | + const struct ccs_path_info *matched_path; | |
1159 | + /* One of values in "enum ccs_path_acl_index". */ | |
1160 | + u8 operation; | |
1161 | + } path; | |
1162 | + struct { | |
1163 | + const struct ccs_path_info *filename1; | |
1164 | + const struct ccs_path_info *filename2; | |
1165 | + /* One of values in "enum ccs_path2_acl_index". */ | |
1166 | + u8 operation; | |
1167 | + } path2; | |
1168 | + struct { | |
1169 | + const struct ccs_path_info *filename; | |
1170 | + unsigned int mode; | |
1171 | + unsigned int major; | |
1172 | + unsigned int minor; | |
1173 | + /* One of values in "enum ccs_mkdev_acl_index". */ | |
1174 | + u8 operation; | |
1175 | + } mkdev; | |
1176 | + struct { | |
1177 | + const struct ccs_path_info *filename; | |
1178 | + unsigned long number; | |
1179 | + /* | |
1180 | + * One of values in "enum ccs_path_number_acl_index". | |
1181 | + */ | |
1182 | + u8 operation; | |
1183 | + } path_number; | |
1184 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
1185 | + struct { | |
1186 | + const u32 *address; /* Big endian. */ | |
1187 | + u16 port; /* Host endian. */ | |
1188 | + /* One of values smaller than CCS_SOCK_MAX. */ | |
1189 | + u8 protocol; | |
1190 | + /* One of values in "enum ccs_network_acl_index". */ | |
1191 | + u8 operation; | |
1192 | + bool is_ipv6; | |
1193 | + } inet_network; | |
1194 | + struct { | |
1195 | + const struct ccs_path_info *address; | |
1196 | + /* One of values smaller than CCS_SOCK_MAX. */ | |
1197 | + u8 protocol; | |
1198 | + /* One of values in "enum ccs_network_acl_index". */ | |
1199 | + u8 operation; | |
1200 | + } unix_network; | |
1201 | +#endif | |
1202 | +#ifdef CONFIG_CCSECURITY_MISC | |
1203 | + struct { | |
1204 | + const struct ccs_path_info *name; | |
1205 | + } environ; | |
1206 | +#endif | |
1207 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
1208 | + struct { | |
1209 | + /* One of values in "enum ccs_capability_acl_index". */ | |
1210 | + u8 operation; | |
1211 | + } capability; | |
1212 | +#endif | |
1213 | +#ifdef CONFIG_CCSECURITY_IPC | |
1214 | + struct { | |
1215 | + const char *dest_pattern; | |
1216 | + int sig; | |
1217 | + } signal; | |
1218 | +#endif | |
1219 | + struct { | |
1220 | + const struct ccs_path_info *type; | |
1221 | + const struct ccs_path_info *dir; | |
1222 | + const struct ccs_path_info *dev; | |
1223 | + unsigned long flags; | |
1224 | + int need_dev; | |
1225 | + } mount; | |
1226 | +#ifdef CONFIG_CCSECURITY_TASK_DOMAIN_TRANSITION | |
1227 | + struct { | |
1228 | + const struct ccs_path_info *domainname; | |
1229 | + } task; | |
1230 | +#endif | |
1231 | + } param; | |
1232 | + /* | |
1233 | + * For updating current->ccs_domain_info at ccs_update_task_domain(). | |
1234 | + * Initialized to NULL at ccs_init_request_info(). | |
1235 | + * Matching "struct ccs_acl_info" is copied if access request was | |
1236 | + * granted. Re-initialized to NULL at ccs_update_task_domain(). | |
1237 | + */ | |
1238 | + struct ccs_acl_info *matched_acl; | |
1239 | + u8 param_type; /* One of values in "enum ccs_acl_entry_type_index". */ | |
1240 | + bool granted; /* True if granted, false otherwise. */ | |
1241 | + /* True if current thread should not be carried sleep penalty. */ | |
1242 | + bool dont_sleep_on_enforce_error; | |
1243 | + /* | |
1244 | + * For counting number of retries made for this request. | |
1245 | + * This counter is incremented whenever ccs_supervisor() returned | |
1246 | + * CCS_RETRY_REQUEST. | |
1247 | + */ | |
1248 | + u8 retry; | |
1249 | + /* | |
1250 | + * For holding profile number used for this request. | |
1251 | + * One of values between 0 and CCS_MAX_PROFILES - 1. | |
1252 | + */ | |
1253 | + u8 profile; | |
1254 | + /* | |
1255 | + * For holding operation mode used for this request. | |
1256 | + * One of CCS_CONFIG_DISABLED, CCS_CONFIG_LEARNING, | |
1257 | + * CCS_CONFIG_PERMISSIVE, CCS_CONFIG_ENFORCING. | |
1258 | + */ | |
1259 | + u8 mode; | |
1260 | + /* | |
1261 | + * For holding operation index used for this request. | |
1262 | + * Used by ccs_init_request_info() / ccs_get_mode() / | |
1263 | + * ccs_write_log(). One of values in "enum ccs_mac_index". | |
1264 | + */ | |
1265 | + u8 type; | |
1266 | +}; | |
1267 | + | |
1268 | +/* Structure for holding a token. */ | |
1269 | +struct ccs_path_info { | |
1270 | + const char *name; | |
1271 | + u32 hash; /* = full_name_hash(name, strlen(name)) */ | |
1272 | + u16 total_len; /* = strlen(name) */ | |
1273 | + u16 const_len; /* = ccs_const_part_length(name) */ | |
1274 | + bool is_dir; /* = ccs_strendswith(name, "/") */ | |
1275 | + bool is_patterned; /* = const_len < total_len */ | |
1276 | +}; | |
1277 | + | |
1278 | +/* Structure for execve() operation. */ | |
1279 | +struct ccs_execve { | |
1280 | + struct ccs_request_info r; | |
1281 | + struct ccs_obj_info obj; | |
1282 | + struct linux_binprm *bprm; | |
1283 | + struct ccs_domain_info *previous_domain; | |
1284 | + const struct ccs_path_info *transition; | |
1285 | + /* For execute_handler */ | |
1286 | + const struct ccs_path_info *handler; | |
1287 | + char *handler_path; /* = kstrdup(handler->name, CCS_GFP_FLAGS) */ | |
1288 | + /* For dumping argv[] and envp[]. */ | |
1289 | + struct ccs_page_dump dump; | |
1290 | + /* For temporary use. */ | |
1291 | + char *tmp; /* Size is CCS_EXEC_TMPSIZE bytes */ | |
1292 | +}; | |
1293 | + | |
1294 | +/* Structure for domain information. */ | |
1295 | +struct ccs_domain_info { | |
1296 | + struct list_head list; | |
1297 | + struct list_head acl_info_list; | |
1298 | + /* Name of this domain. Never NULL. */ | |
1299 | + const struct ccs_path_info *domainname; | |
1300 | + /* Namespace for this domain. Never NULL. */ | |
1301 | + struct ccs_policy_namespace *ns; | |
1302 | + /* Group numbers to use. */ | |
1303 | + unsigned long group[CCS_MAX_ACL_GROUPS / BITS_PER_LONG]; | |
1304 | + u8 profile; /* Profile number to use. */ | |
1305 | + bool is_deleted; /* Delete flag. */ | |
1306 | + bool flags[CCS_MAX_DOMAIN_INFO_FLAGS]; | |
1307 | +}; | |
1308 | + | |
1309 | +/* | |
1310 | + * Structure for "reset_domain"/"no_reset_domain"/"initialize_domain"/ | |
1311 | + * "no_initialize_domain"/"keep_domain"/"no_keep_domain" keyword. | |
1312 | + */ | |
1313 | +struct ccs_transition_control { | |
1314 | + struct ccs_acl_head head; | |
1315 | + u8 type; /* One of values in "enum ccs_transition_type" */ | |
1316 | + bool is_last_name; /* True if the domainname is ccs_last_word(). */ | |
1317 | + const struct ccs_path_info *domainname; /* Maybe NULL */ | |
1318 | + const struct ccs_path_info *program; /* Maybe NULL */ | |
1319 | +}; | |
1320 | + | |
1321 | +/* Structure for "aggregator" keyword. */ | |
1322 | +struct ccs_aggregator { | |
1323 | + struct ccs_acl_head head; | |
1324 | + const struct ccs_path_info *original_name; | |
1325 | + const struct ccs_path_info *aggregated_name; | |
1326 | +}; | |
1327 | + | |
1328 | +/* Structure for "deny_autobind" keyword. */ | |
1329 | +struct ccs_reserved { | |
1330 | + struct ccs_acl_head head; | |
1331 | + struct ccs_number_union port; | |
1332 | +}; | |
1333 | + | |
1334 | +/* Structure for policy manager. */ | |
1335 | +struct ccs_manager { | |
1336 | + struct ccs_acl_head head; | |
1337 | + /* A path to program or a domainname. */ | |
1338 | + const struct ccs_path_info *manager; | |
1339 | +}; | |
1340 | + | |
1341 | +/* Structure for argv[]. */ | |
1342 | +struct ccs_argv { | |
1343 | + unsigned long index; | |
1344 | + const struct ccs_path_info *value; | |
1345 | + bool is_not; | |
1346 | +}; | |
1347 | + | |
1348 | +/* Structure for envp[]. */ | |
1349 | +struct ccs_envp { | |
1350 | + const struct ccs_path_info *name; | |
1351 | + const struct ccs_path_info *value; | |
1352 | + bool is_not; | |
1353 | +}; | |
1354 | + | |
1355 | +/* | |
1356 | + * Structure for "task auto_execute_handler" and "task denied_execute_handler" | |
1357 | + * directive. | |
1358 | + * | |
1359 | + * If "task auto_execute_handler" directive exists and the current process is | |
1360 | + * not an execute handler, all execve() requests are replaced by execve() | |
1361 | + * requests of a program specified by "task auto_execute_handler" directive. | |
1362 | + * If the current process is an execute handler, "task auto_execute_handler" | |
1363 | + * and "task denied_execute_handler" directives are ignored. | |
1364 | + * The program specified by "task execute_handler" validates execve() | |
1365 | + * parameters and executes the original execve() requests if appropriate. | |
1366 | + * | |
1367 | + * "task denied_execute_handler" directive is used only when execve() request | |
1368 | + * was rejected in enforcing mode (i.e. CONFIG::file::execute={ mode=enforcing | |
1369 | + * }). The program specified by "task denied_execute_handler" does whatever it | |
1370 | + * wants to do (e.g. silently terminate, change firewall settings, redirect the | |
1371 | + * user to honey pot etc.). | |
1372 | + */ | |
1373 | +struct ccs_handler_acl { | |
1374 | + struct ccs_acl_info head; /* type = CCS_TYPE_*_EXECUTE_HANDLER */ | |
1375 | + const struct ccs_path_info *handler; /* Pointer to single pathname. */ | |
1376 | +}; | |
1377 | + | |
1378 | +/* | |
1379 | + * Structure for "task auto_domain_transition" and | |
1380 | + * "task manual_domain_transition" directive. | |
1381 | + */ | |
1382 | +struct ccs_task_acl { | |
1383 | + struct ccs_acl_info head; /* type = CCS_TYPE_*_TASK_ACL */ | |
1384 | + /* Pointer to domainname. */ | |
1385 | + const struct ccs_path_info *domainname; | |
1386 | +}; | |
1387 | + | |
1388 | +/* | |
1389 | + * Structure for "file execute", "file read", "file write", "file append", | |
1390 | + * "file unlink", "file getattr", "file rmdir", "file truncate", | |
1391 | + * "file symlink", "file chroot" and "file unmount" directive. | |
1392 | + */ | |
1393 | +struct ccs_path_acl { | |
1394 | + struct ccs_acl_info head; /* type = CCS_TYPE_PATH_ACL */ | |
1395 | + struct ccs_name_union name; | |
1396 | +}; | |
1397 | + | |
1398 | +/* | |
1399 | + * Structure for "file rename", "file link" and "file pivot_root" directive. | |
1400 | + */ | |
1401 | +struct ccs_path2_acl { | |
1402 | + struct ccs_acl_info head; /* type = CCS_TYPE_PATH2_ACL */ | |
1403 | + struct ccs_name_union name1; | |
1404 | + struct ccs_name_union name2; | |
1405 | +}; | |
1406 | + | |
1407 | +/* | |
1408 | + * Structure for "file create", "file mkdir", "file mkfifo", "file mksock", | |
1409 | + * "file ioctl", "file chmod", "file chown" and "file chgrp" directive. | |
1410 | + */ | |
1411 | +struct ccs_path_number_acl { | |
1412 | + struct ccs_acl_info head; /* type = CCS_TYPE_PATH_NUMBER_ACL */ | |
1413 | + struct ccs_name_union name; | |
1414 | + struct ccs_number_union number; | |
1415 | +}; | |
1416 | + | |
1417 | +/* Structure for "file mkblock" and "file mkchar" directive. */ | |
1418 | +struct ccs_mkdev_acl { | |
1419 | + struct ccs_acl_info head; /* type = CCS_TYPE_MKDEV_ACL */ | |
1420 | + struct ccs_name_union name; | |
1421 | + struct ccs_number_union mode; | |
1422 | + struct ccs_number_union major; | |
1423 | + struct ccs_number_union minor; | |
1424 | +}; | |
1425 | + | |
1426 | +/* Structure for "file mount" directive. */ | |
1427 | +struct ccs_mount_acl { | |
1428 | + struct ccs_acl_info head; /* type = CCS_TYPE_MOUNT_ACL */ | |
1429 | + struct ccs_name_union dev_name; | |
1430 | + struct ccs_name_union dir_name; | |
1431 | + struct ccs_name_union fs_type; | |
1432 | + struct ccs_number_union flags; | |
1433 | +}; | |
1434 | + | |
1435 | +/* Structure for "misc env" directive in domain policy. */ | |
1436 | +struct ccs_env_acl { | |
1437 | + struct ccs_acl_info head; /* type = CCS_TYPE_ENV_ACL */ | |
1438 | + const struct ccs_path_info *env; /* environment variable */ | |
1439 | +}; | |
1440 | + | |
1441 | +/* Structure for "capability" directive. */ | |
1442 | +struct ccs_capability_acl { | |
1443 | + struct ccs_acl_info head; /* type = CCS_TYPE_CAPABILITY_ACL */ | |
1444 | + u8 operation; /* One of values in "enum ccs_capability_acl_index". */ | |
1445 | +}; | |
1446 | + | |
1447 | +/* Structure for "ipc signal" directive. */ | |
1448 | +struct ccs_signal_acl { | |
1449 | + struct ccs_acl_info head; /* type = CCS_TYPE_SIGNAL_ACL */ | |
1450 | + struct ccs_number_union sig; | |
1451 | + /* Pointer to destination pattern. */ | |
1452 | + const struct ccs_path_info *domainname; | |
1453 | +}; | |
1454 | + | |
1455 | +/* Structure for "network inet" directive. */ | |
1456 | +struct ccs_inet_acl { | |
1457 | + struct ccs_acl_info head; /* type = CCS_TYPE_INET_ACL */ | |
1458 | + u8 protocol; | |
1459 | + struct ccs_ipaddr_union address; | |
1460 | + struct ccs_number_union port; | |
1461 | +}; | |
1462 | + | |
1463 | +/* Structure for "network unix" directive. */ | |
1464 | +struct ccs_unix_acl { | |
1465 | + struct ccs_acl_info head; /* type = CCS_TYPE_UNIX_ACL */ | |
1466 | + u8 protocol; | |
1467 | + struct ccs_name_union name; | |
1468 | +}; | |
1469 | + | |
1470 | +/* Structure for holding string data. */ | |
1471 | +struct ccs_name { | |
1472 | + struct ccs_shared_acl_head head; | |
1473 | + int size; /* Memory size allocated for this entry. */ | |
1474 | + struct ccs_path_info entry; | |
1475 | +}; | |
1476 | + | |
1477 | +/* Structure for holding a line from /proc/ccs/ interface. */ | |
1478 | +struct ccs_acl_param { | |
1479 | + char *data; /* Unprocessed data. */ | |
1480 | + struct list_head *list; /* List to add or remove. */ | |
1481 | + struct ccs_policy_namespace *ns; /* Namespace to use. */ | |
1482 | + bool is_delete; /* True if it is a delete request. */ | |
1483 | + union ccs_acl_union { | |
1484 | + struct ccs_acl_info acl_info; | |
1485 | + struct ccs_handler_acl handler_acl; | |
1486 | + struct ccs_task_acl task_acl; | |
1487 | + struct ccs_path_acl path_acl; | |
1488 | + struct ccs_path2_acl path2_acl; | |
1489 | + struct ccs_path_number_acl path_number_acl; | |
1490 | + struct ccs_mkdev_acl mkdev_acl; | |
1491 | + struct ccs_mount_acl mount_acl; | |
1492 | + struct ccs_env_acl env_acl; | |
1493 | + struct ccs_capability_acl capability_acl; | |
1494 | + struct ccs_signal_acl signal_acl; | |
1495 | + struct ccs_inet_acl inet_acl; | |
1496 | + struct ccs_unix_acl unix_acl; | |
1497 | + /**/ | |
1498 | + struct ccs_acl_head acl_head; | |
1499 | + struct ccs_transition_control transition_control; | |
1500 | + struct ccs_aggregator aggregator; | |
1501 | + struct ccs_reserved reserved; | |
1502 | + struct ccs_manager manager; | |
1503 | + struct ccs_path_group path_group; | |
1504 | + struct ccs_number_group number_group; | |
1505 | + struct ccs_address_group address_group; | |
1506 | + } e; | |
1507 | +}; | |
1508 | + | |
1509 | +/* Structure for reading/writing policy via /proc/ccs/ interfaces. */ | |
1510 | +struct ccs_io_buffer { | |
1511 | + /* Exclusive lock for this structure. */ | |
1512 | + struct mutex io_sem; | |
1513 | + char __user *read_user_buf; | |
1514 | + size_t read_user_buf_avail; | |
1515 | + struct { | |
1516 | + struct list_head *ns; | |
1517 | + struct list_head *domain; | |
1518 | + struct list_head *group; | |
1519 | + struct list_head *acl; | |
1520 | + size_t avail; | |
1521 | + unsigned int step; | |
1522 | + unsigned int query_index; | |
1523 | + u16 index; | |
1524 | + u16 cond_index; | |
1525 | + u8 acl_group_index; | |
1526 | + u8 cond_step; | |
1527 | + u8 bit; | |
1528 | + u8 w_pos; | |
1529 | + bool eof; | |
1530 | + bool print_this_domain_only; | |
1531 | + bool print_transition_related_only; | |
1532 | + bool print_cond_part; | |
1533 | + const char *w[CCS_MAX_IO_READ_QUEUE]; | |
1534 | + } r; | |
1535 | + struct { | |
1536 | + struct ccs_policy_namespace *ns; | |
1537 | + struct ccs_domain_info *domain; | |
1538 | + size_t avail; | |
1539 | + bool is_delete; | |
1540 | + } w; | |
1541 | + /* Buffer for reading. */ | |
1542 | + char *read_buf; | |
1543 | + /* Size of read buffer. */ | |
1544 | + size_t readbuf_size; | |
1545 | + /* Buffer for writing. */ | |
1546 | + char *write_buf; | |
1547 | + /* Size of write buffer. */ | |
1548 | + size_t writebuf_size; | |
1549 | + /* Type of interface. */ | |
1550 | + enum ccs_proc_interface_index type; | |
1551 | + /* Users counter protected by ccs_io_buffer_list_lock. */ | |
1552 | + u8 users; | |
1553 | + /* List for telling GC not to kfree() elements. */ | |
1554 | + struct list_head list; | |
1555 | +}; | |
1556 | + | |
1557 | +/* Structure for /proc/ccs/profile interface. */ | |
1558 | +struct ccs_profile { | |
1559 | + const struct ccs_path_info *comment; | |
1560 | + u8 default_config; | |
1561 | + u8 config[CCS_MAX_MAC_INDEX + CCS_MAX_MAC_CATEGORY_INDEX]; | |
1562 | + unsigned int pref[CCS_MAX_PREF]; | |
1563 | +}; | |
1564 | + | |
1565 | +/* Structure for representing YYYY/MM/DD hh/mm/ss. */ | |
1566 | +struct ccs_time { | |
1567 | + u16 year; | |
1568 | + u8 month; | |
1569 | + u8 day; | |
1570 | + u8 hour; | |
1571 | + u8 min; | |
1572 | + u8 sec; | |
1573 | +}; | |
1574 | + | |
1575 | +/* Structure for policy namespace. */ | |
1576 | +struct ccs_policy_namespace { | |
1577 | + /* Profile table. Memory is allocated as needed. */ | |
1578 | + struct ccs_profile *profile_ptr[CCS_MAX_PROFILES]; | |
1579 | + /* List of "struct ccs_group". */ | |
1580 | + struct list_head group_list[CCS_MAX_GROUP]; | |
1581 | + /* List of policy. */ | |
1582 | + struct list_head policy_list[CCS_MAX_POLICY]; | |
1583 | + /* The global ACL referred by "use_group" keyword. */ | |
1584 | + struct list_head acl_group[CCS_MAX_ACL_GROUPS]; | |
1585 | + /* List for connecting to ccs_namespace_list list. */ | |
1586 | + struct list_head namespace_list; | |
1587 | + /* Profile version. Currently only 20150505 is supported. */ | |
1588 | + unsigned int profile_version; | |
1589 | + /* Name of this namespace (e.g. "<kernel>", "</usr/sbin/httpd>" ). */ | |
1590 | + const char *name; | |
1591 | +}; | |
1592 | + | |
1593 | +/* Prototype definition for "struct ccsecurity_operations". */ | |
1594 | + | |
1595 | +void __init ccs_permission_init(void); | |
1596 | +void __init ccs_mm_init(void); | |
1597 | + | |
1598 | +/* Prototype definition for internal use. */ | |
1599 | + | |
1600 | +bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, | |
1601 | + struct ccs_page_dump *dump); | |
1602 | +bool ccs_memory_ok(const void *ptr, const unsigned int size); | |
1603 | +char *ccs_encode(const char *str); | |
1604 | +char *ccs_encode2(const char *str, int str_len); | |
1605 | +char *ccs_realpath(const struct path *path); | |
1606 | +const char *ccs_get_exe(void); | |
1607 | +const struct ccs_path_info *ccs_get_name(const char *name); | |
1608 | +int ccs_audit_log(struct ccs_request_info *r); | |
1609 | +int ccs_check_acl(struct ccs_request_info *r); | |
1610 | +int ccs_init_request_info(struct ccs_request_info *r, const u8 index); | |
1611 | +struct ccs_domain_info *ccs_assign_domain(const char *domainname, | |
1612 | + const bool transit); | |
1613 | +u8 ccs_get_config(const u8 profile, const u8 index); | |
1614 | +void *ccs_commit_ok(void *data, const unsigned int size); | |
1615 | +void ccs_del_acl(struct list_head *element); | |
1616 | +void ccs_del_condition(struct list_head *element); | |
1617 | +void ccs_fill_path_info(struct ccs_path_info *ptr); | |
1618 | +void ccs_get_attributes(struct ccs_obj_info *obj); | |
1619 | +void ccs_notify_gc(struct ccs_io_buffer *head, const bool is_register); | |
1620 | +void ccs_transition_failed(const char *domainname); | |
1621 | +void ccs_warn_oom(const char *function); | |
1622 | +void ccs_write_log(struct ccs_request_info *r, const char *fmt, ...) | |
1623 | + __printf(2, 3); | |
1624 | + | |
1625 | +/* Variable definition for internal use. */ | |
1626 | + | |
1627 | +extern bool ccs_policy_loaded; | |
1628 | +extern const char * const ccs_dif[CCS_MAX_DOMAIN_INFO_FLAGS]; | |
1629 | +extern const u8 ccs_c2mac[CCS_MAX_CAPABILITY_INDEX]; | |
1630 | +extern const u8 ccs_pn2mac[CCS_MAX_PATH_NUMBER_OPERATION]; | |
1631 | +extern const u8 ccs_pnnn2mac[CCS_MAX_MKDEV_OPERATION]; | |
1632 | +extern const u8 ccs_pp2mac[CCS_MAX_PATH2_OPERATION]; | |
1633 | +extern struct ccs_domain_info ccs_kernel_domain; | |
1634 | +extern struct list_head ccs_condition_list; | |
1635 | +extern struct list_head ccs_domain_list; | |
1636 | +extern struct list_head ccs_name_list[CCS_MAX_HASH]; | |
1637 | +extern struct list_head ccs_namespace_list; | |
1638 | +extern struct mutex ccs_policy_lock; | |
1639 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19) | |
1640 | +extern struct srcu_struct ccs_ss; | |
1641 | +#endif | |
1642 | +extern unsigned int ccs_memory_quota[CCS_MAX_MEMORY_STAT]; | |
1643 | +extern unsigned int ccs_memory_used[CCS_MAX_MEMORY_STAT]; | |
1644 | + | |
1645 | +/* Inlined functions for internal use. */ | |
1646 | + | |
1647 | +/** | |
1648 | + * ccs_pathcmp - strcmp() for "struct ccs_path_info" structure. | |
1649 | + * | |
1650 | + * @a: Pointer to "struct ccs_path_info". | |
1651 | + * @b: Pointer to "struct ccs_path_info". | |
1652 | + * | |
1653 | + * Returns true if @a != @b, false otherwise. | |
1654 | + */ | |
1655 | +static inline bool ccs_pathcmp(const struct ccs_path_info *a, | |
1656 | + const struct ccs_path_info *b) | |
1657 | +{ | |
1658 | + return a->hash != b->hash || strcmp(a->name, b->name); | |
1659 | +} | |
1660 | + | |
1661 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19) | |
1662 | + | |
1663 | +/** | |
1664 | + * ccs_read_lock - Take lock for protecting policy. | |
1665 | + * | |
1666 | + * Returns index number for ccs_read_unlock(). | |
1667 | + */ | |
1668 | +static inline int ccs_read_lock(void) | |
1669 | +{ | |
1670 | + return srcu_read_lock(&ccs_ss); | |
1671 | +} | |
1672 | + | |
1673 | +/** | |
1674 | + * ccs_read_unlock - Release lock for protecting policy. | |
1675 | + * | |
1676 | + * @idx: Index number returned by ccs_read_lock(). | |
1677 | + * | |
1678 | + * Returns nothing. | |
1679 | + */ | |
1680 | +static inline void ccs_read_unlock(const int idx) | |
1681 | +{ | |
1682 | + srcu_read_unlock(&ccs_ss, idx); | |
1683 | +} | |
1684 | + | |
1685 | +#else | |
1686 | + | |
1687 | +int ccs_lock(void); | |
1688 | +void ccs_unlock(const int idx); | |
1689 | + | |
1690 | +/** | |
1691 | + * ccs_read_lock - Take lock for protecting policy. | |
1692 | + * | |
1693 | + * Returns index number for ccs_read_unlock(). | |
1694 | + */ | |
1695 | +static inline int ccs_read_lock(void) | |
1696 | +{ | |
1697 | + return ccs_lock(); | |
1698 | +} | |
1699 | + | |
1700 | +/** | |
1701 | + * ccs_read_unlock - Release lock for protecting policy. | |
1702 | + * | |
1703 | + * @idx: Index number returned by ccs_read_lock(). | |
1704 | + * | |
1705 | + * Returns nothing. | |
1706 | + */ | |
1707 | +static inline void ccs_read_unlock(const int idx) | |
1708 | +{ | |
1709 | + ccs_unlock(idx); | |
1710 | +} | |
1711 | + | |
1712 | +#endif | |
1713 | + | |
1714 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18) | |
1715 | + | |
1716 | +/** | |
1717 | + * ccs_tasklist_lock - Take lock for reading list of "struct task_struct". | |
1718 | + * | |
1719 | + * Returns nothing. | |
1720 | + */ | |
1721 | +static inline void ccs_tasklist_lock(void) | |
1722 | +{ | |
1723 | + rcu_read_lock(); | |
1724 | +} | |
1725 | + | |
1726 | +/** | |
1727 | + * ccs_tasklist_unlock - Release lock for reading list of "struct task_struct". | |
1728 | + * | |
1729 | + * Returns nothing. | |
1730 | + */ | |
1731 | +static inline void ccs_tasklist_unlock(void) | |
1732 | +{ | |
1733 | + rcu_read_unlock(); | |
1734 | +} | |
1735 | + | |
1736 | +#else | |
1737 | + | |
1738 | +/** | |
1739 | + * ccs_tasklist_lock - Take lock for reading list of "struct task_struct". | |
1740 | + * | |
1741 | + * Returns nothing. | |
1742 | + */ | |
1743 | +static inline void ccs_tasklist_lock(void) | |
1744 | +{ | |
1745 | + read_lock(&tasklist_lock); | |
1746 | +} | |
1747 | + | |
1748 | +/** | |
1749 | + * ccs_tasklist_unlock - Release lock for reading list of "struct task_struct". | |
1750 | + * | |
1751 | + * Returns nothing. | |
1752 | + */ | |
1753 | +static inline void ccs_tasklist_unlock(void) | |
1754 | +{ | |
1755 | + read_unlock(&tasklist_lock); | |
1756 | +} | |
1757 | + | |
1758 | +#endif | |
1759 | + | |
1760 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
1761 | + | |
1762 | +/** | |
1763 | + * ccs_sys_getppid - Copy of getppid(). | |
1764 | + * | |
1765 | + * Returns parent process's PID. | |
1766 | + * | |
1767 | + * Alpha does not have getppid() defined. To be able to build this module on | |
1768 | + * Alpha, I have to copy getppid() from kernel/timer.c. | |
1769 | + */ | |
1770 | +static inline pid_t ccs_sys_getppid(void) | |
1771 | +{ | |
1772 | + pid_t pid; | |
1773 | + rcu_read_lock(); | |
1774 | + pid = task_tgid_vnr(rcu_dereference(current->real_parent)); | |
1775 | + rcu_read_unlock(); | |
1776 | + return pid; | |
1777 | +} | |
1778 | + | |
1779 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) | |
1780 | + | |
1781 | +/** | |
1782 | + * ccs_sys_getppid - Copy of getppid(). | |
1783 | + * | |
1784 | + * Returns parent process's PID. | |
1785 | + * | |
1786 | + * This function was rewritten to use RCU in 2.6.16.34. However, distributors | |
1787 | + * which use earlier kernels (e.g. 2.6.8/2.6.9) did not backport the bugfix. | |
1788 | + * Therefore, I'm using code for 2.6.16.34 for earlier kernels. | |
1789 | + */ | |
1790 | +static inline pid_t ccs_sys_getppid(void) | |
1791 | +{ | |
1792 | + pid_t pid; | |
1793 | + rcu_read_lock(); | |
1794 | +#if (defined(RHEL_MAJOR) && RHEL_MAJOR == 5) || (defined(AX_MAJOR) && AX_MAJOR == 3) | |
1795 | + pid = rcu_dereference(current->parent)->tgid; | |
1796 | +#elif defined(CONFIG_UTRACE) | |
1797 | + /* | |
1798 | + * RHEL 5.0 kernel does not have RHEL_MAJOR/RHEL_MINOR defined. | |
1799 | + * Assume RHEL 5.0 if CONFIG_UTRACE is defined. | |
1800 | + */ | |
1801 | + pid = rcu_dereference(current->parent)->tgid; | |
1802 | +#else | |
1803 | + pid = rcu_dereference(current->real_parent)->tgid; | |
1804 | +#endif | |
1805 | + rcu_read_unlock(); | |
1806 | + return pid; | |
1807 | +} | |
1808 | + | |
1809 | +#else | |
1810 | + | |
1811 | +/** | |
1812 | + * ccs_sys_getppid - Copy of getppid(). | |
1813 | + * | |
1814 | + * Returns parent process's PID. | |
1815 | + * | |
1816 | + * I can't use code for 2.6.16.34 for 2.4 kernels because 2.4 kernels does not | |
1817 | + * have RCU. Therefore, I'm using pessimistic lock (i.e. tasklist_lock | |
1818 | + * spinlock). | |
1819 | + */ | |
1820 | +static inline pid_t ccs_sys_getppid(void) | |
1821 | +{ | |
1822 | + pid_t pid; | |
1823 | + read_lock(&tasklist_lock); | |
1824 | +#ifdef TASK_DEAD | |
1825 | + pid = current->group_leader->real_parent->tgid; | |
1826 | +#else | |
1827 | + pid = current->p_opptr->pid; | |
1828 | +#endif | |
1829 | + read_unlock(&tasklist_lock); | |
1830 | + return pid; | |
1831 | +} | |
1832 | + | |
1833 | +#endif | |
1834 | + | |
1835 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
1836 | + | |
1837 | +/** | |
1838 | + * ccs_sys_getpid - Copy of getpid(). | |
1839 | + * | |
1840 | + * Returns current thread's PID. | |
1841 | + * | |
1842 | + * Alpha does not have getpid() defined. To be able to build this module on | |
1843 | + * Alpha, I have to copy getpid() from kernel/timer.c. | |
1844 | + */ | |
1845 | +static inline pid_t ccs_sys_getpid(void) | |
1846 | +{ | |
1847 | + return task_tgid_vnr(current); | |
1848 | +} | |
1849 | + | |
1850 | +#else | |
1851 | + | |
1852 | +/** | |
1853 | + * ccs_sys_getpid - Copy of getpid(). | |
1854 | + * | |
1855 | + * Returns current thread's PID. | |
1856 | + */ | |
1857 | +static inline pid_t ccs_sys_getpid(void) | |
1858 | +{ | |
1859 | + return current->tgid; | |
1860 | +} | |
1861 | + | |
1862 | +#endif | |
1863 | + | |
1864 | +/** | |
1865 | + * ccs_get_mode - Get mode for specified functionality. | |
1866 | + * | |
1867 | + * @profile: Profile number. | |
1868 | + * @index: Functionality number. | |
1869 | + * | |
1870 | + * Returns mode. | |
1871 | + */ | |
1872 | +static inline u8 ccs_get_mode(const u8 profile, const u8 index) | |
1873 | +{ | |
1874 | + return ccs_get_config(profile, index) & (CCS_CONFIG_MAX_MODE - 1); | |
1875 | +} | |
1876 | + | |
1877 | +#if defined(CONFIG_SLOB) | |
1878 | + | |
1879 | +/** | |
1880 | + * ccs_round2 - Round up to power of 2 for calculating memory usage. | |
1881 | + * | |
1882 | + * @size: Size to be rounded up. | |
1883 | + * | |
1884 | + * Returns @size. | |
1885 | + * | |
1886 | + * Since SLOB does not round up, this function simply returns @size. | |
1887 | + */ | |
1888 | +static inline int ccs_round2(size_t size) | |
1889 | +{ | |
1890 | + return size; | |
1891 | +} | |
1892 | + | |
1893 | +#else | |
1894 | + | |
1895 | +/** | |
1896 | + * ccs_round2 - Round up to power of 2 for calculating memory usage. | |
1897 | + * | |
1898 | + * @size: Size to be rounded up. | |
1899 | + * | |
1900 | + * Returns rounded size. | |
1901 | + * | |
1902 | + * Strictly speaking, SLAB may be able to allocate (e.g.) 96 bytes instead of | |
1903 | + * (e.g.) 128 bytes. | |
1904 | + */ | |
1905 | +static inline int ccs_round2(size_t size) | |
1906 | +{ | |
1907 | +#if PAGE_SIZE == 4096 | |
1908 | + size_t bsize = 32; | |
1909 | +#else | |
1910 | + size_t bsize = 64; | |
1911 | +#endif | |
1912 | + if (!size) | |
1913 | + return 0; | |
1914 | + while (size > bsize) | |
1915 | + bsize <<= 1; | |
1916 | + return bsize; | |
1917 | +} | |
1918 | + | |
1919 | +#endif | |
1920 | + | |
1921 | +/** | |
1922 | + * ccs_put_condition - Drop reference on "struct ccs_condition". | |
1923 | + * | |
1924 | + * @cond: Pointer to "struct ccs_condition". Maybe NULL. | |
1925 | + * | |
1926 | + * Returns nothing. | |
1927 | + */ | |
1928 | +static inline void ccs_put_condition(struct ccs_condition *cond) | |
1929 | +{ | |
1930 | + if (cond) | |
1931 | + atomic_dec(&cond->head.users); | |
1932 | +} | |
1933 | + | |
1934 | +/** | |
1935 | + * ccs_put_group - Drop reference on "struct ccs_group". | |
1936 | + * | |
1937 | + * @group: Pointer to "struct ccs_group". Maybe NULL. | |
1938 | + * | |
1939 | + * Returns nothing. | |
1940 | + */ | |
1941 | +static inline void ccs_put_group(struct ccs_group *group) | |
1942 | +{ | |
1943 | + if (group) | |
1944 | + atomic_dec(&group->head.users); | |
1945 | +} | |
1946 | + | |
1947 | +/** | |
1948 | + * ccs_put_name - Drop reference on "struct ccs_name". | |
1949 | + * | |
1950 | + * @name: Pointer to "struct ccs_path_info". Maybe NULL. | |
1951 | + * | |
1952 | + * Returns nothing. | |
1953 | + */ | |
1954 | +static inline void ccs_put_name(const struct ccs_path_info *name) | |
1955 | +{ | |
1956 | + if (name) | |
1957 | + atomic_dec(&container_of(name, struct ccs_name, entry)-> | |
1958 | + head.users); | |
1959 | +} | |
1960 | + | |
1961 | +/* For importing variables and functions. */ | |
1962 | +extern struct ccsecurity_exports ccsecurity_exports; | |
1963 | + | |
1964 | +#ifdef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
1965 | + | |
1966 | +/* | |
1967 | + * Structure for holding "struct ccs_domain_info *" and "struct ccs_execve *" | |
1968 | + * and "u32 ccs_flags" for each "struct task_struct". | |
1969 | + * | |
1970 | + * "struct ccs_domain_info *" and "u32 ccs_flags" for each "struct task_struct" | |
1971 | + * are maintained outside that "struct task_struct". Therefore, ccs_security | |
1972 | + * != task_struct . This keeps KABI for distributor's prebuilt kernels but | |
1973 | + * entails slow access. | |
1974 | + * | |
1975 | + * Memory for this structure is allocated when current thread tries to access | |
1976 | + * it. Therefore, if memory allocation failed, current thread will be killed by | |
1977 | + * SIGKILL. Note that if current->pid == 1, sending SIGKILL won't work. | |
1978 | + */ | |
1979 | +struct ccs_security { | |
1980 | + struct list_head list; | |
1981 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29) || LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0) | |
1982 | + const struct task_struct *task; | |
1983 | +#else | |
1984 | + struct pid *pid; /* Maybe NULL. */ | |
1985 | + const struct cred *cred; /* Maybe NULL. */ | |
1986 | +#endif | |
1987 | + struct ccs_domain_info *ccs_domain_info; | |
1988 | + u32 ccs_flags; | |
1989 | + struct ccs_execve *ee; /* Maybe NULL. */ | |
1990 | + struct rcu_head rcu; | |
1991 | +}; | |
1992 | + | |
1993 | +void __init ccs_main_init(void); | |
1994 | +bool ccs_used_by_cred(const struct ccs_domain_info *domain); | |
1995 | +int ccs_start_execve(struct linux_binprm *bprm, struct ccs_execve **eep); | |
1996 | +void ccs_finish_execve(int retval, struct ccs_execve *ee); | |
1997 | +void ccs_load_policy(const char *filename); | |
1998 | +#ifndef CONFIG_AKARI_TRACE_EXECVE_COUNT | |
1999 | +#define ccs_audit_alloc_execve(ee) do { } while (0) | |
2000 | +#define ccs_audit_free_execve(ee, is_current) do { } while (0) | |
2001 | +#else | |
2002 | +void ccs_audit_alloc_execve(const struct ccs_execve * const ee); | |
2003 | +void ccs_audit_free_execve(const struct ccs_execve * const ee, | |
2004 | + const bool is_current); | |
2005 | +#endif | |
2006 | + | |
2007 | +#define CCS_TASK_SECURITY_HASH_BITS 12 | |
2008 | +#define CCS_MAX_TASK_SECURITY_HASH (1u << CCS_TASK_SECURITY_HASH_BITS) | |
2009 | +extern struct list_head ccs_task_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
2010 | + | |
2011 | +struct ccs_security *ccs_find_task_security(const struct task_struct *task); | |
2012 | + | |
2013 | +/** | |
2014 | + * ccs_current_security - Get "struct ccs_security" for current thread. | |
2015 | + * | |
2016 | + * Returns pointer to "struct ccs_security" for current thread. | |
2017 | + */ | |
2018 | +static inline struct ccs_security *ccs_current_security(void) | |
2019 | +{ | |
2020 | + return ccs_find_task_security(current); | |
2021 | +} | |
2022 | + | |
2023 | +/** | |
2024 | + * ccs_task_domain - Get "struct ccs_domain_info" for specified thread. | |
2025 | + * | |
2026 | + * @task: Pointer to "struct task_struct". | |
2027 | + * | |
2028 | + * Returns pointer to "struct ccs_security" for specified thread. | |
2029 | + */ | |
2030 | +static inline struct ccs_domain_info *ccs_task_domain(struct task_struct *task) | |
2031 | +{ | |
2032 | + struct ccs_domain_info *domain; | |
2033 | + rcu_read_lock(); | |
2034 | + domain = ccs_find_task_security(task)->ccs_domain_info; | |
2035 | + rcu_read_unlock(); | |
2036 | + return domain; | |
2037 | +} | |
2038 | + | |
2039 | +/** | |
2040 | + * ccs_current_domain - Get "struct ccs_domain_info" for current thread. | |
2041 | + * | |
2042 | + * Returns pointer to "struct ccs_domain_info" for current thread. | |
2043 | + */ | |
2044 | +static inline struct ccs_domain_info *ccs_current_domain(void) | |
2045 | +{ | |
2046 | + return ccs_find_task_security(current)->ccs_domain_info; | |
2047 | +} | |
2048 | + | |
2049 | +/** | |
2050 | + * ccs_task_flags - Get flags for specified thread. | |
2051 | + * | |
2052 | + * @task: Pointer to "struct task_struct". | |
2053 | + * | |
2054 | + * Returns flags for specified thread. | |
2055 | + */ | |
2056 | +static inline u32 ccs_task_flags(struct task_struct *task) | |
2057 | +{ | |
2058 | + u32 ccs_flags; | |
2059 | + rcu_read_lock(); | |
2060 | + ccs_flags = ccs_find_task_security(task)->ccs_flags; | |
2061 | + rcu_read_unlock(); | |
2062 | + return ccs_flags; | |
2063 | +} | |
2064 | + | |
2065 | +/** | |
2066 | + * ccs_current_flags - Get flags for current thread. | |
2067 | + * | |
2068 | + * Returns flags for current thread. | |
2069 | + */ | |
2070 | +static inline u32 ccs_current_flags(void) | |
2071 | +{ | |
2072 | + return ccs_find_task_security(current)->ccs_flags; | |
2073 | +} | |
2074 | + | |
2075 | +#else | |
2076 | + | |
2077 | +/* | |
2078 | + * "struct ccs_domain_info *" and "u32 ccs_flags" for each "struct task_struct" | |
2079 | + * are maintained inside that "struct task_struct". Therefore, ccs_security == | |
2080 | + * task_struct . This allows fast access but breaks KABI checks for | |
2081 | + * distributor's prebuilt kernels due to changes in "struct task_struct". | |
2082 | + */ | |
2083 | +#define ccs_security task_struct | |
2084 | + | |
2085 | +/** | |
2086 | + * ccs_find_task_security - Find "struct ccs_security" for given task. | |
2087 | + * | |
2088 | + * @task: Pointer to "struct task_struct". | |
2089 | + * | |
2090 | + * Returns pointer to "struct ccs_security". | |
2091 | + */ | |
2092 | +static inline struct ccs_security *ccs_find_task_security(struct task_struct * | |
2093 | + task) | |
2094 | +{ | |
2095 | + return task; | |
2096 | +} | |
2097 | + | |
2098 | +/** | |
2099 | + * ccs_current_security - Get "struct ccs_security" for current thread. | |
2100 | + * | |
2101 | + * Returns pointer to "struct ccs_security" for current thread. | |
2102 | + */ | |
2103 | +static inline struct ccs_security *ccs_current_security(void) | |
2104 | +{ | |
2105 | + return ccs_find_task_security(current); | |
2106 | +} | |
2107 | + | |
2108 | +/** | |
2109 | + * ccs_task_domain - Get "struct ccs_domain_info" for specified thread. | |
2110 | + * | |
2111 | + * @task: Pointer to "struct task_struct". | |
2112 | + * | |
2113 | + * Returns pointer to "struct ccs_security" for specified thread. | |
2114 | + */ | |
2115 | +static inline struct ccs_domain_info *ccs_task_domain(struct task_struct *task) | |
2116 | +{ | |
2117 | + struct ccs_domain_info *domain = task->ccs_domain_info; | |
2118 | + return domain ? domain : &ccs_kernel_domain; | |
2119 | +} | |
2120 | + | |
2121 | +/** | |
2122 | + * ccs_current_domain - Get "struct ccs_domain_info" for current thread. | |
2123 | + * | |
2124 | + * Returns pointer to "struct ccs_domain_info" for current thread. | |
2125 | + * | |
2126 | + * If current thread does not belong to a domain (which is true for initial | |
2127 | + * init_task in order to hide ccs_kernel_domain from this module), | |
2128 | + * current thread enters into ccs_kernel_domain. | |
2129 | + */ | |
2130 | +static inline struct ccs_domain_info *ccs_current_domain(void) | |
2131 | +{ | |
2132 | + struct task_struct *task = current; | |
2133 | + if (!task->ccs_domain_info) | |
2134 | + task->ccs_domain_info = &ccs_kernel_domain; | |
2135 | + return task->ccs_domain_info; | |
2136 | +} | |
2137 | + | |
2138 | +/** | |
2139 | + * ccs_task_flags - Get flags for specified thread. | |
2140 | + * | |
2141 | + * @task: Pointer to "struct task_struct". | |
2142 | + * | |
2143 | + * Returns flags for specified thread. | |
2144 | + */ | |
2145 | +static inline u32 ccs_task_flags(struct task_struct *task) | |
2146 | +{ | |
2147 | + return ccs_find_task_security(task)->ccs_flags; | |
2148 | +} | |
2149 | + | |
2150 | +/** | |
2151 | + * ccs_current_flags - Get flags for current thread. | |
2152 | + * | |
2153 | + * Returns flags for current thread. | |
2154 | + */ | |
2155 | +static inline u32 ccs_current_flags(void) | |
2156 | +{ | |
2157 | + return ccs_find_task_security(current)->ccs_flags; | |
2158 | +} | |
2159 | + | |
2160 | +#endif | |
2161 | + | |
2162 | +/** | |
2163 | + * ccs_current_namespace - Get "struct ccs_policy_namespace" for current thread. | |
2164 | + * | |
2165 | + * Returns pointer to "struct ccs_policy_namespace" for current thread. | |
2166 | + */ | |
2167 | +static inline struct ccs_policy_namespace *ccs_current_namespace(void) | |
2168 | +{ | |
2169 | + return ccs_current_domain()->ns; | |
2170 | +} | |
2171 | + | |
2172 | +#endif |
@@ -0,0 +1,353 @@ | ||
1 | +/* | |
2 | + * security/ccsecurity/load_policy.c | |
3 | + * | |
4 | + * Copyright (C) 2005-2012 NTT DATA CORPORATION | |
5 | + * | |
6 | + * Version: 1.8.6 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include <linux/version.h> | |
10 | +#include <linux/module.h> | |
11 | +#include <linux/init.h> | |
12 | +#include <linux/binfmts.h> | |
13 | +#include <linux/sched.h> | |
14 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) | |
15 | +#include <linux/kmod.h> | |
16 | +/* | |
17 | + * Regarding 2.4 kernels, we need to define __KERNEL_SYSCALLS__ in order to use | |
18 | + * waitpid() because call_usermodehelper() does not support UMH_WAIT_PROC. | |
19 | + */ | |
20 | +#define __KERNEL_SYSCALLS__ | |
21 | +#include <linux/unistd.h> | |
22 | +#else | |
23 | +#include <linux/fs.h> | |
24 | +#include <linux/namei.h> | |
25 | +#endif | |
26 | +#ifndef LOOKUP_POSITIVE | |
27 | +#define LOOKUP_POSITIVE 0 | |
28 | +#endif | |
29 | + | |
30 | +/* | |
31 | + * TOMOYO specific part start. | |
32 | + */ | |
33 | + | |
34 | +#include "internal.h" | |
35 | + | |
36 | +#if 0 | |
37 | +/** | |
38 | + * ccs_setup - Set enable/disable upon boot. | |
39 | + * | |
40 | + * @str: "off" to disable, "on" to enable. | |
41 | + * | |
42 | + * Returns 0. | |
43 | + */ | |
44 | +static int __init ccs_setup(char *str) | |
45 | +{ | |
46 | + if (!strcmp(str, "off")) | |
47 | + ccsecurity_ops.disabled = 1; | |
48 | + else if (!strcmp(str, "on")) | |
49 | + ccsecurity_ops.disabled = 0; | |
50 | + return 0; | |
51 | +} | |
52 | + | |
53 | +__setup("ccsecurity=", ccs_setup); | |
54 | +#endif | |
55 | + | |
56 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
57 | + | |
58 | +/* Path to the policy loader. (default = CONFIG_CCSECURITY_POLICY_LOADER) */ | |
59 | +static const char *ccs_loader; | |
60 | + | |
61 | +#if 0 | |
62 | +/** | |
63 | + * ccs_loader_setup - Set policy loader. | |
64 | + * | |
65 | + * @str: Program to use as a policy loader (e.g. /sbin/ccs-init ). | |
66 | + * | |
67 | + * Returns 0. | |
68 | + */ | |
69 | +static int __init ccs_loader_setup(char *str) | |
70 | +{ | |
71 | + ccs_loader = str; | |
72 | + return 0; | |
73 | +} | |
74 | + | |
75 | +__setup("CCS_loader=", ccs_loader_setup); | |
76 | +#endif | |
77 | + | |
78 | +/** | |
79 | + * ccs_policy_loader_exists - Check whether /sbin/ccs-init exists. | |
80 | + * | |
81 | + * Returns true if /sbin/ccs-init exists, false otherwise. | |
82 | + */ | |
83 | +static _Bool ccs_policy_loader_exists(void) | |
84 | +{ | |
85 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28) | |
86 | + struct path path; | |
87 | + if (!ccs_loader) | |
88 | + ccs_loader = CONFIG_CCSECURITY_POLICY_LOADER; | |
89 | + if (kern_path(ccs_loader, LOOKUP_FOLLOW | LOOKUP_POSITIVE, | |
90 | + &path) == 0) { | |
91 | + path_put(&path); | |
92 | + return 1; | |
93 | + } | |
94 | +#else | |
95 | + struct nameidata nd; | |
96 | + if (!ccs_loader) | |
97 | + ccs_loader = CONFIG_CCSECURITY_POLICY_LOADER; | |
98 | + if (path_lookup(ccs_loader, LOOKUP_FOLLOW | LOOKUP_POSITIVE, | |
99 | + &nd) == 0) { | |
100 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) | |
101 | + path_put(&nd.path); | |
102 | +#else | |
103 | + path_release(&nd); | |
104 | +#endif | |
105 | + return 1; | |
106 | + } | |
107 | +#endif | |
108 | + printk(KERN_INFO "Not activating Mandatory Access Control " | |
109 | + "as %s does not exist.\n", ccs_loader); | |
110 | + return 0; | |
111 | +} | |
112 | + | |
113 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) | |
114 | + | |
115 | +/** | |
116 | + * ccs_run_loader - Start /sbin/ccs-init. | |
117 | + * | |
118 | + * @unused: Not used. | |
119 | + * | |
120 | + * Returns PID of /sbin/ccs-init on success, negative value otherwise. | |
121 | + */ | |
122 | +static int ccs_run_loader(void *unused) | |
123 | +{ | |
124 | + char *argv[2]; | |
125 | + char *envp[3]; | |
126 | + printk(KERN_INFO "Calling %s to load policy. Please wait.\n", | |
127 | + ccs_loader); | |
128 | + argv[0] = (char *) ccs_loader; | |
129 | + argv[1] = NULL; | |
130 | + envp[0] = "HOME=/"; | |
131 | + envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
132 | + envp[2] = NULL; | |
133 | + return exec_usermodehelper(argv[0], argv, envp); | |
134 | +} | |
135 | + | |
136 | +#endif | |
137 | + | |
138 | +/* Path to the trigger. (default = CONFIG_CCSECURITY_ACTIVATION_TRIGGER) */ | |
139 | +static const char *ccs_trigger; | |
140 | + | |
141 | +#if 0 | |
142 | +/** | |
143 | + * ccs_trigger_setup - Set trigger for activation. | |
144 | + * | |
145 | + * @str: Program to use as an activation trigger (e.g. /sbin/init ). | |
146 | + * | |
147 | + * Returns 0. | |
148 | + */ | |
149 | +static int __init ccs_trigger_setup(char *str) | |
150 | +{ | |
151 | + ccs_trigger = str; | |
152 | + return 0; | |
153 | +} | |
154 | + | |
155 | +__setup("CCS_trigger=", ccs_trigger_setup); | |
156 | +#endif | |
157 | + | |
158 | +/** | |
159 | + * ccs_load_policy - Run external policy loader to load policy. | |
160 | + * | |
161 | + * @filename: The program about to start. | |
162 | + * | |
163 | + * Returns nothing. | |
164 | + * | |
165 | + * This function checks whether @filename is /sbin/init, and if so | |
166 | + * invoke /sbin/ccs-init and wait for the termination of /sbin/ccs-init | |
167 | + * and then continues invocation of /sbin/init. | |
168 | + * /sbin/ccs-init reads policy files in /etc/ccs/ directory and | |
169 | + * writes to /proc/ccs/ interfaces. | |
170 | + */ | |
171 | +void ccs_load_policy(const char *filename) | |
172 | +{ | |
173 | + static _Bool done; | |
174 | + if (ccsecurity_ops.disabled || done) | |
175 | + return; | |
176 | + if (!ccs_trigger) | |
177 | + ccs_trigger = CONFIG_CCSECURITY_ACTIVATION_TRIGGER; | |
178 | + if (strcmp(filename, ccs_trigger)) | |
179 | + return; | |
180 | + if (!ccs_policy_loader_exists()) | |
181 | + return; | |
182 | + done = 1; | |
183 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) | |
184 | + { | |
185 | + char *argv[2]; | |
186 | + char *envp[3]; | |
187 | + printk(KERN_INFO "Calling %s to load policy. Please wait.\n", | |
188 | + ccs_loader); | |
189 | + argv[0] = (char *) ccs_loader; | |
190 | + argv[1] = NULL; | |
191 | + envp[0] = "HOME=/"; | |
192 | + envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
193 | + envp[2] = NULL; | |
194 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) || defined(UMH_WAIT_PROC) | |
195 | + call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
196 | +#else | |
197 | + call_usermodehelper(argv[0], argv, envp, 1); | |
198 | +#endif | |
199 | + } | |
200 | +#elif defined(TASK_DEAD) | |
201 | + { | |
202 | + /* Copied from kernel/kmod.c */ | |
203 | + struct task_struct *task = current; | |
204 | + pid_t pid = kernel_thread(ccs_run_loader, NULL, 0); | |
205 | + sigset_t tmpsig; | |
206 | + spin_lock_irq(&task->sighand->siglock); | |
207 | + tmpsig = task->blocked; | |
208 | + siginitsetinv(&task->blocked, | |
209 | + sigmask(SIGKILL) | sigmask(SIGSTOP)); | |
210 | + recalc_sigpending(); | |
211 | + spin_unlock_irq(&task->sighand->siglock); | |
212 | + if (pid >= 0) | |
213 | + waitpid(pid, NULL, __WCLONE); | |
214 | + spin_lock_irq(&task->sighand->siglock); | |
215 | + task->blocked = tmpsig; | |
216 | + recalc_sigpending(); | |
217 | + spin_unlock_irq(&task->sighand->siglock); | |
218 | + } | |
219 | +#else | |
220 | + { | |
221 | + /* Copied from kernel/kmod.c */ | |
222 | + struct task_struct *task = current; | |
223 | + pid_t pid = kernel_thread(ccs_run_loader, NULL, 0); | |
224 | + sigset_t tmpsig; | |
225 | + spin_lock_irq(&task->sigmask_lock); | |
226 | + tmpsig = task->blocked; | |
227 | + siginitsetinv(&task->blocked, | |
228 | + sigmask(SIGKILL) | sigmask(SIGSTOP)); | |
229 | + recalc_sigpending(task); | |
230 | + spin_unlock_irq(&task->sigmask_lock); | |
231 | + if (pid >= 0) | |
232 | + waitpid(pid, NULL, __WCLONE); | |
233 | + spin_lock_irq(&task->sigmask_lock); | |
234 | + task->blocked = tmpsig; | |
235 | + recalc_sigpending(task); | |
236 | + spin_unlock_irq(&task->sigmask_lock); | |
237 | + } | |
238 | +#endif | |
239 | + if (ccsecurity_ops.check_profile) | |
240 | + ccsecurity_ops.check_profile(); | |
241 | + else | |
242 | + panic("Failed to load policy."); | |
243 | +} | |
244 | + | |
245 | +#endif | |
246 | + | |
247 | +#if 0 | |
248 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0) | |
249 | + | |
250 | +/** | |
251 | + * __ccs_search_binary_handler - Load policy before calling search_binary_handler(). | |
252 | + * | |
253 | + * @bprm: Pointer to "struct linux_binprm". | |
254 | + * | |
255 | + * Returns 0 on success, negative value otherwise. | |
256 | + */ | |
257 | +static int __ccs_search_binary_handler(struct linux_binprm *bprm) | |
258 | +{ | |
259 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
260 | + ccs_load_policy(bprm->filename); | |
261 | +#endif | |
262 | + /* | |
263 | + * ccs_load_policy() executes /sbin/ccs-init if bprm->filename is | |
264 | + * /sbin/init. /sbin/ccs-init executes /etc/ccs/ccs-load-module to | |
265 | + * load loadable kernel module. The loadable kernel module modifies | |
266 | + * "struct ccsecurity_ops". Thus, we need to transfer control to | |
267 | + * __ccs_search_binary_handler() in security/ccsecurity/permission.c | |
268 | + * if "struct ccsecurity_ops" was modified. | |
269 | + */ | |
270 | + if (ccsecurity_ops.search_binary_handler | |
271 | + != __ccs_search_binary_handler) | |
272 | + return ccsecurity_ops.search_binary_handler(bprm); | |
273 | + return search_binary_handler(bprm); | |
274 | +} | |
275 | + | |
276 | +#else | |
277 | + | |
278 | +/** | |
279 | + * __ccs_search_binary_handler - Load policy before calling search_binary_handler(). | |
280 | + * | |
281 | + * @bprm: Pointer to "struct linux_binprm". | |
282 | + * @regs: Pointer to "struct pt_regs". | |
283 | + * | |
284 | + * Returns 0 on success, negative value otherwise. | |
285 | + */ | |
286 | +static int __ccs_search_binary_handler(struct linux_binprm *bprm, | |
287 | + struct pt_regs *regs) | |
288 | +{ | |
289 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
290 | + ccs_load_policy(bprm->filename); | |
291 | +#endif | |
292 | + /* | |
293 | + * ccs_load_policy() executes /sbin/ccs-init if bprm->filename is | |
294 | + * /sbin/init. /sbin/ccs-init executes /etc/ccs/ccs-load-module to | |
295 | + * load loadable kernel module. The loadable kernel module modifies | |
296 | + * "struct ccsecurity_ops". Thus, we need to transfer control to | |
297 | + * __ccs_search_binary_handler() in security/ccsecurity/permission.c | |
298 | + * if "struct ccsecurity_ops" was modified. | |
299 | + */ | |
300 | + if (ccsecurity_ops.search_binary_handler | |
301 | + != __ccs_search_binary_handler) | |
302 | + return ccsecurity_ops.search_binary_handler(bprm, regs); | |
303 | + return search_binary_handler(bprm, regs); | |
304 | +} | |
305 | + | |
306 | +#endif | |
307 | + | |
308 | +/* | |
309 | + * Some exports for loadable kernel module part. | |
310 | + * | |
311 | + * Although scripts/checkpatch.pl complains about use of "extern" in C file, | |
312 | + * we don't put these into security/ccsecurity/internal.h because we want to | |
313 | + * split built-in part and loadable kernel module part. | |
314 | + */ | |
315 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) && LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 35) | |
316 | +extern spinlock_t vfsmount_lock; | |
317 | +#endif | |
318 | + | |
319 | +/* For exporting variables and functions. */ | |
320 | +const struct ccsecurity_exports ccsecurity_exports = { | |
321 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
322 | + .load_policy = ccs_load_policy, | |
323 | +#endif | |
324 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0) | |
325 | + .d_absolute_path = d_absolute_path, | |
326 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) | |
327 | + .__d_path = __d_path, | |
328 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) | |
329 | + .vfsmount_lock = &vfsmount_lock, | |
330 | +#endif | |
331 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
332 | + .find_task_by_vpid = find_task_by_vpid, | |
333 | + .find_task_by_pid_ns = find_task_by_pid_ns, | |
334 | +#endif | |
335 | +}; | |
336 | +#ifdef CONFIG_CCSECURITY_LKM | |
337 | +/* Only ccsecurity module need to access this struct. */ | |
338 | +EXPORT_SYMBOL_GPL(ccsecurity_exports); | |
339 | +#endif | |
340 | + | |
341 | +/* Members are updated by loadable kernel module. */ | |
342 | +struct ccsecurity_operations ccsecurity_ops = { | |
343 | + .search_binary_handler = __ccs_search_binary_handler, | |
344 | +#ifdef CONFIG_CCSECURITY_DISABLE_BY_DEFAULT | |
345 | + .disabled = 1, | |
346 | +#endif | |
347 | +}; | |
348 | +/* | |
349 | + * Non-GPL modules might need to access this struct via inlined functions | |
350 | + * embedded into include/linux/security.h and include/net/ip.h | |
351 | + */ | |
352 | +EXPORT_SYMBOL(ccsecurity_ops); | |
353 | +#endif |
@@ -0,0 +1,1588 @@ | ||
1 | +/* | |
2 | + * lsm.c | |
3 | + * | |
4 | + * Copyright (C) 2010-2015 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | |
5 | + * | |
6 | + * Version: 1.0.39 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include "internal.h" | |
10 | +#include "probe.h" | |
11 | + | |
12 | +/* Prototype definition. */ | |
13 | + | |
14 | +static int __ccs_alloc_task_security(const struct task_struct *task); | |
15 | +static void __ccs_free_task_security(const struct task_struct *task); | |
16 | + | |
17 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
18 | +static struct ccs_security ccs_oom_security = { | |
19 | + .ccs_domain_info = &ccs_kernel_domain | |
20 | +}; | |
21 | + | |
22 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
23 | +static struct ccs_security ccs_default_security = { | |
24 | + .ccs_domain_info = &ccs_kernel_domain | |
25 | +}; | |
26 | + | |
27 | +/* List of "struct ccs_security". */ | |
28 | +struct list_head ccs_task_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
29 | +/* Lock for protecting ccs_task_security_list[]. */ | |
30 | +static DEFINE_SPINLOCK(ccs_task_security_list_lock); | |
31 | + | |
32 | +/* Dummy marker for calling security_bprm_free(). */ | |
33 | +static const unsigned long ccs_bprm_security; | |
34 | + | |
35 | +/* For exporting variables and functions. */ | |
36 | +struct ccsecurity_exports ccsecurity_exports; | |
37 | +/* Members are updated by loadable kernel module. */ | |
38 | +struct ccsecurity_operations ccsecurity_ops; | |
39 | + | |
40 | +/* Function pointers originally registered by register_security(). */ | |
41 | +static struct security_operations original_security_ops /* = *security_ops; */; | |
42 | + | |
43 | +#ifdef CONFIG_AKARI_TRACE_EXECVE_COUNT | |
44 | + | |
45 | +/** | |
46 | + * ccs_update_ee_counter - Update "struct ccs_execve" counter. | |
47 | + * | |
48 | + * @count: Count to increment or decrement. | |
49 | + * | |
50 | + * Returns updated counter. | |
51 | + */ | |
52 | +static unsigned int ccs_update_ee_counter(int count) | |
53 | +{ | |
54 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10) || defined(atomic_add_return) | |
55 | + /* Debug counter for detecting "struct ccs_execve" memory leak. */ | |
56 | + static atomic_t ccs_ee_counter = ATOMIC_INIT(0); | |
57 | + return atomic_add_return(count, &ccs_ee_counter); | |
58 | +#else | |
59 | + static DEFINE_SPINLOCK(ccs_ee_lock); | |
60 | + static unsigned int ccs_ee_counter; | |
61 | + unsigned long flags; | |
62 | + spin_lock_irqsave(&ccs_ee_lock, flags); | |
63 | + ccs_ee_counter += count; | |
64 | + count = ccs_ee_counter; | |
65 | + spin_unlock_irqrestore(&ccs_ee_lock, flags); | |
66 | + return count; | |
67 | +#endif | |
68 | +} | |
69 | + | |
70 | +/** | |
71 | + * ccs_audit_alloc_execve - Audit allocation of "struct ccs_execve". | |
72 | + * | |
73 | + * @ee: Pointer to "struct ccs_execve". | |
74 | + * | |
75 | + * Returns nothing. | |
76 | + */ | |
77 | +void ccs_audit_alloc_execve(const struct ccs_execve * const ee) | |
78 | +{ | |
79 | + printk(KERN_INFO "AKARI: Allocated %p by pid=%u (count=%u)\n", ee, | |
80 | + current->pid, ccs_update_ee_counter(1) - 1); | |
81 | +} | |
82 | + | |
83 | +/** | |
84 | + * ccs_audit_free_execve - Audit release of "struct ccs_execve". | |
85 | + * | |
86 | + * @ee: Pointer to "struct ccs_execve". | |
87 | + * @task: True if released by current task, false otherwise. | |
88 | + * | |
89 | + * Returns nothing. | |
90 | + */ | |
91 | +void ccs_audit_free_execve(const struct ccs_execve * const ee, | |
92 | + const bool is_current) | |
93 | +{ | |
94 | + const unsigned int tmp = ccs_update_ee_counter(-1); | |
95 | + if (is_current) | |
96 | + printk(KERN_INFO "AKARI: Releasing %p by pid=%u (count=%u)\n", | |
97 | + ee, current->pid, tmp); | |
98 | + else | |
99 | + printk(KERN_INFO "AKARI: Releasing %p by kernel (count=%u)\n", | |
100 | + ee, tmp); | |
101 | +} | |
102 | + | |
103 | +#endif | |
104 | + | |
105 | +#if !defined(CONFIG_AKARI_DEBUG) | |
106 | +#define ccs_debug_trace(pos) do { } while (0) | |
107 | +#else | |
108 | +#define ccs_debug_trace(pos) \ | |
109 | + do { \ | |
110 | + static bool done; \ | |
111 | + if (!done) { \ | |
112 | + printk(KERN_INFO \ | |
113 | + "AKARI: Debug trace: " pos " of 4\n"); \ | |
114 | + done = true; \ | |
115 | + } \ | |
116 | + } while (0) | |
117 | +#endif | |
118 | + | |
119 | +/** | |
120 | + * ccs_clear_execve - Release memory used by do_execve(). | |
121 | + * | |
122 | + * @ret: 0 if do_execve() succeeded, negative value otherwise. | |
123 | + * @security: Pointer to "struct ccs_security". | |
124 | + * | |
125 | + * Returns nothing. | |
126 | + */ | |
127 | +static void ccs_clear_execve(int ret, struct ccs_security *security) | |
128 | +{ | |
129 | + struct ccs_execve *ee; | |
130 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
131 | + return; | |
132 | + ee = security->ee; | |
133 | + security->ee = NULL; | |
134 | + if (!ee) | |
135 | + return; | |
136 | + ccs_finish_execve(ret, ee); | |
137 | +} | |
138 | + | |
139 | +/** | |
140 | + * ccs_task_alloc_security - Allocate memory for new tasks. | |
141 | + * | |
142 | + * @p: Pointer to "struct task_struct". | |
143 | + * | |
144 | + * Returns 0 on success, negative value otherwise. | |
145 | + */ | |
146 | +static int ccs_task_alloc_security(struct task_struct *p) | |
147 | +{ | |
148 | + int rc = __ccs_alloc_task_security(p); | |
149 | + if (rc) | |
150 | + return rc; | |
151 | + while (!original_security_ops.task_alloc_security) | |
152 | + smp_rmb(); | |
153 | + rc = original_security_ops.task_alloc_security(p); | |
154 | + if (rc) | |
155 | + __ccs_free_task_security(p); | |
156 | + return rc; | |
157 | +} | |
158 | + | |
159 | +/** | |
160 | + * ccs_task_free_security - Release memory for "struct task_struct". | |
161 | + * | |
162 | + * @p: Pointer to "struct task_struct". | |
163 | + * | |
164 | + * Returns nothing. | |
165 | + */ | |
166 | +static void ccs_task_free_security(struct task_struct *p) | |
167 | +{ | |
168 | + while (!original_security_ops.task_free_security) | |
169 | + smp_rmb(); | |
170 | + original_security_ops.task_free_security(p); | |
171 | + __ccs_free_task_security(p); | |
172 | +} | |
173 | + | |
174 | +/** | |
175 | + * ccs_bprm_alloc_security - Allocate memory for "struct linux_binprm". | |
176 | + * | |
177 | + * @bprm: Pointer to "struct linux_binprm". | |
178 | + * | |
179 | + * Returns 0 on success, negative value otherwise. | |
180 | + */ | |
181 | +static int ccs_bprm_alloc_security(struct linux_binprm *bprm) | |
182 | +{ | |
183 | + int rc; | |
184 | + while (!original_security_ops.bprm_alloc_security) | |
185 | + smp_rmb(); | |
186 | + rc = original_security_ops.bprm_alloc_security(bprm); | |
187 | + if (bprm->security || rc) | |
188 | + return rc; | |
189 | + /* | |
190 | + * Update bprm->security to &ccs_bprm_security so that | |
191 | + * security_bprm_free() is called even if do_execve() failed at | |
192 | + * search_binary_handler() without allocating memory at | |
193 | + * security_bprm_alloc(). This trick assumes that active LSM module | |
194 | + * does not access bprm->security if that module did not allocate | |
195 | + * memory at security_bprm_alloc(). | |
196 | + */ | |
197 | + bprm->security = (void *) &ccs_bprm_security; | |
198 | + return 0; | |
199 | +} | |
200 | + | |
201 | +/** | |
202 | + * ccs_bprm_free_security - Release memory for "struct linux_binprm". | |
203 | + * | |
204 | + * @bprm: Pointer to "struct linux_binprm". | |
205 | + * | |
206 | + * Returns nothing. | |
207 | + */ | |
208 | +static void ccs_bprm_free_security(struct linux_binprm *bprm) | |
209 | +{ | |
210 | + /* | |
211 | + * If do_execve() succeeded, bprm->security will be updated to NULL at | |
212 | + * security_bprm_compute_creds()/security_bprm_apply_creds() if | |
213 | + * bprm->security was set to &ccs_bprm_security at | |
214 | + * security_bprm_alloc(). | |
215 | + * | |
216 | + * If do_execve() failed, bprm->security remains at &ccs_bprm_security | |
217 | + * if bprm->security was set to &ccs_bprm_security at | |
218 | + * security_bprm_alloc(). | |
219 | + * | |
220 | + * And do_execve() does not call security_bprm_free() if do_execve() | |
221 | + * failed and bprm->security == NULL. Therefore, do not call | |
222 | + * original_security_ops.bprm_free_security() if bprm->security remains | |
223 | + * at &ccs_bprm_security . | |
224 | + */ | |
225 | + if (bprm->security != &ccs_bprm_security) { | |
226 | + while (!original_security_ops.bprm_free_security) | |
227 | + smp_rmb(); | |
228 | + original_security_ops.bprm_free_security(bprm); | |
229 | + } | |
230 | + /* | |
231 | + * If do_execve() succeeded, | |
232 | + * ccs_clear_execve(0, ccs_current_security()); | |
233 | + * is called before calling below one. | |
234 | + * Thus, below call becomes no-op if do_execve() succeeded. | |
235 | + */ | |
236 | + ccs_clear_execve(-1, ccs_current_security()); | |
237 | +} | |
238 | + | |
239 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 6) | |
240 | + | |
241 | +/** | |
242 | + * ccs_bprm_compute_creds - A hook which is called when do_execve() succeeded. | |
243 | + * | |
244 | + * @bprm: Pointer to "struct linux_binprm". | |
245 | + * | |
246 | + * Returns nothing. | |
247 | + */ | |
248 | +static void ccs_bprm_compute_creds(struct linux_binprm *bprm) | |
249 | +{ | |
250 | + if (bprm->security == &ccs_bprm_security) | |
251 | + bprm->security = NULL; | |
252 | + while (!original_security_ops.bprm_compute_creds) | |
253 | + smp_rmb(); | |
254 | + original_security_ops.bprm_compute_creds(bprm); | |
255 | + ccs_clear_execve(0, ccs_current_security()); | |
256 | +} | |
257 | + | |
258 | +#else | |
259 | + | |
260 | +/** | |
261 | + * ccs_bprm_apply_creds - A hook which is called when do_execve() succeeded. | |
262 | + * | |
263 | + * @bprm: Pointer to "struct linux_binprm". | |
264 | + * @unsafe: Unsafe flag. | |
265 | + * | |
266 | + * Returns nothing. | |
267 | + */ | |
268 | +static void ccs_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) | |
269 | +{ | |
270 | + if (bprm->security == &ccs_bprm_security) | |
271 | + bprm->security = NULL; | |
272 | + while (!original_security_ops.bprm_apply_creds) | |
273 | + smp_rmb(); | |
274 | + original_security_ops.bprm_apply_creds(bprm, unsafe); | |
275 | + ccs_clear_execve(0, ccs_current_security()); | |
276 | +} | |
277 | + | |
278 | +#endif | |
279 | + | |
280 | +/** | |
281 | + * ccs_bprm_check_security - Check permission for execve(). | |
282 | + * | |
283 | + * @bprm: Pointer to "struct linux_binprm". | |
284 | + * | |
285 | + * Returns 0 on success, negative value otherwise. | |
286 | + */ | |
287 | +static int ccs_bprm_check_security(struct linux_binprm *bprm) | |
288 | +{ | |
289 | + struct ccs_security *security = ccs_current_security(); | |
290 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
291 | + return -ENOMEM; | |
292 | + if (!security->ee) { | |
293 | + int rc; | |
294 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
295 | + if (!ccs_policy_loaded) | |
296 | + ccs_load_policy(bprm->filename); | |
297 | +#endif | |
298 | + rc = ccs_start_execve(bprm, &security->ee); | |
299 | + if (rc) | |
300 | + return rc; | |
301 | + } | |
302 | + while (!original_security_ops.bprm_check_security) | |
303 | + smp_rmb(); | |
304 | + return original_security_ops.bprm_check_security(bprm); | |
305 | +} | |
306 | + | |
307 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
308 | + | |
309 | +/** | |
310 | + * ccs_open - Check permission for open(). | |
311 | + * | |
312 | + * @f: Pointer to "struct file". | |
313 | + * | |
314 | + * Returns 0 on success, negative value otherwise. | |
315 | + */ | |
316 | +static int ccs_open(struct file *f) | |
317 | +{ | |
318 | + return ccs_open_permission(f->f_path.dentry, f->f_path.mnt, | |
319 | + f->f_flags + 1); | |
320 | +} | |
321 | + | |
322 | +#endif | |
323 | + | |
324 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
325 | + | |
326 | +/** | |
327 | + * ccs_dentry_open - Check permission for open(). | |
328 | + * | |
329 | + * @f: Pointer to "struct file". | |
330 | + * | |
331 | + * Returns 0 on success, negative value otherwise. | |
332 | + */ | |
333 | +static int ccs_dentry_open(struct file *f) | |
334 | +{ | |
335 | + int rc = ccs_open(f); | |
336 | + if (rc) | |
337 | + return rc; | |
338 | + while (!original_security_ops.dentry_open) | |
339 | + smp_rmb(); | |
340 | + return original_security_ops.dentry_open(f); | |
341 | +} | |
342 | + | |
343 | +#else | |
344 | + | |
345 | +/** | |
346 | + * ccs_open - Check permission for open(). | |
347 | + * | |
348 | + * @inode: Pointer to "struct inode". | |
349 | + * @mask: Open mode. | |
350 | + * @nd: Pointer to "struct nameidata". | |
351 | + * | |
352 | + * Returns 0 on success, negative value otherwise. | |
353 | + */ | |
354 | +static int ccs_open(struct inode *inode, int mask, struct nameidata *nd) | |
355 | +{ | |
356 | + int flags; | |
357 | + if (!nd || !nd->dentry) | |
358 | + return 0; | |
359 | + /* open_exec() passes MAY_EXEC . */ | |
360 | + if (mask == MAY_EXEC && inode && S_ISREG(inode->i_mode) && | |
361 | + (ccs_current_flags() & CCS_TASK_IS_IN_EXECVE)) | |
362 | + mask = MAY_READ; | |
363 | + /* | |
364 | + * This flags value is passed to ACC_MODE(). | |
365 | + * ccs_open_permission() for older versions uses old ACC_MODE(). | |
366 | + */ | |
367 | + switch (mask & (MAY_READ | MAY_WRITE)) { | |
368 | + case MAY_READ: | |
369 | + flags = 01; | |
370 | + break; | |
371 | + case MAY_WRITE: | |
372 | + flags = 02; | |
373 | + break; | |
374 | + case MAY_READ | MAY_WRITE: | |
375 | + flags = 03; | |
376 | + break; | |
377 | + default: | |
378 | + return 0; | |
379 | + } | |
380 | + return ccs_open_permission(nd->dentry, nd->mnt, flags); | |
381 | +} | |
382 | + | |
383 | +/** | |
384 | + * ccs_inode_permission - Check permission for open(). | |
385 | + * | |
386 | + * @inode: Pointer to "struct inode". | |
387 | + * @mask: Open mode. | |
388 | + * @nd: Pointer to "struct nameidata". | |
389 | + * | |
390 | + * Returns 0 on success, negative value otherwise. | |
391 | + * | |
392 | + * Note that this hook is called from permission(), and may not be called for | |
393 | + * open(). Maybe it is better to use security_file_permission(). | |
394 | + */ | |
395 | +static int ccs_inode_permission(struct inode *inode, int mask, | |
396 | + struct nameidata *nd) | |
397 | +{ | |
398 | + int rc = ccs_open(inode, mask, nd); | |
399 | + if (rc) | |
400 | + return rc; | |
401 | + while (!original_security_ops.inode_permission) | |
402 | + smp_rmb(); | |
403 | + return original_security_ops.inode_permission(inode, mask, nd); | |
404 | +} | |
405 | + | |
406 | +#endif | |
407 | + | |
408 | +/** | |
409 | + * ccs_inode_setattr - Check permission for chown()/chgrp()/chmod()/truncate(). | |
410 | + * | |
411 | + * @dentry: Pointer to "struct dentry". | |
412 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
413 | + * @attr: Pointer to "struct iattr". | |
414 | + * | |
415 | + * Returns 0 on success, negative value otherwise. | |
416 | + */ | |
417 | +static int ccs_inode_setattr(struct dentry *dentry, struct vfsmount *mnt, | |
418 | + struct iattr *attr) | |
419 | +{ | |
420 | + int rc = 0; | |
421 | + if (attr->ia_valid & ATTR_UID) | |
422 | + rc = ccs_chown_permission(dentry, mnt, attr->ia_uid, -1); | |
423 | + if (!rc && (attr->ia_valid & ATTR_GID)) | |
424 | + rc = ccs_chown_permission(dentry, mnt, -1, attr->ia_gid); | |
425 | + if (!rc && (attr->ia_valid & ATTR_MODE)) | |
426 | + rc = ccs_chmod_permission(dentry, mnt, attr->ia_mode); | |
427 | + if (!rc && (attr->ia_valid & ATTR_SIZE)) | |
428 | + rc = ccs_truncate_permission(dentry, mnt); | |
429 | + if (rc) | |
430 | + return rc; | |
431 | + while (!original_security_ops.inode_setattr) | |
432 | + smp_rmb(); | |
433 | + return original_security_ops.inode_setattr(dentry, mnt, attr); | |
434 | +} | |
435 | + | |
436 | +/** | |
437 | + * ccs_inode_getattr - Check permission for stat(). | |
438 | + * | |
439 | + * @mnt: Pointer to "struct vfsmount". | |
440 | + * @dentry: Pointer to "struct dentry". | |
441 | + * | |
442 | + * Returns 0 on success, negative value otherwise. | |
443 | + */ | |
444 | +static int ccs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
445 | +{ | |
446 | + int rc = ccs_getattr_permission(mnt, dentry); | |
447 | + if (rc) | |
448 | + return rc; | |
449 | + while (!original_security_ops.inode_getattr) | |
450 | + smp_rmb(); | |
451 | + return original_security_ops.inode_getattr(mnt, dentry); | |
452 | +} | |
453 | + | |
454 | +/** | |
455 | + * ccs_inode_mknod - Check permission for mknod(). | |
456 | + * | |
457 | + * @dir: Pointer to "struct inode". | |
458 | + * @dentry: Pointer to "struct dentry". | |
459 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
460 | + * @mode: Create mode. | |
461 | + * @dev: Device major/minor number. | |
462 | + * | |
463 | + * Returns 0 on success, negative value otherwise. | |
464 | + */ | |
465 | +static int ccs_inode_mknod(struct inode *dir, struct dentry *dentry, | |
466 | + struct vfsmount *mnt, int mode, dev_t dev) | |
467 | +{ | |
468 | + int rc = ccs_mknod_permission(dentry, mnt, mode, dev); | |
469 | + if (rc) | |
470 | + return rc; | |
471 | + while (!original_security_ops.inode_mknod) | |
472 | + smp_rmb(); | |
473 | + return original_security_ops.inode_mknod(dir, dentry, mnt, mode, dev); | |
474 | +} | |
475 | + | |
476 | +/** | |
477 | + * ccs_inode_mkdir - Check permission for mkdir(). | |
478 | + * | |
479 | + * @dir: Pointer to "struct inode". | |
480 | + * @dentry: Pointer to "struct dentry". | |
481 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
482 | + * @mode: Create mode. | |
483 | + * | |
484 | + * Returns 0 on success, negative value otherwise. | |
485 | + */ | |
486 | +static int ccs_inode_mkdir(struct inode *dir, struct dentry *dentry, | |
487 | + struct vfsmount *mnt, int mode) | |
488 | +{ | |
489 | + int rc = ccs_mkdir_permission(dentry, mnt, mode); | |
490 | + if (rc) | |
491 | + return rc; | |
492 | + while (!original_security_ops.inode_mkdir) | |
493 | + smp_rmb(); | |
494 | + return original_security_ops.inode_mkdir(dir, dentry, mnt, mode); | |
495 | +} | |
496 | + | |
497 | +/** | |
498 | + * ccs_inode_rmdir - Check permission for rmdir(). | |
499 | + * | |
500 | + * @dir: Pointer to "struct inode". | |
501 | + * @dentry: Pointer to "struct dentry". | |
502 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
503 | + * | |
504 | + * Returns 0 on success, negative value otherwise. | |
505 | + */ | |
506 | +static int ccs_inode_rmdir(struct inode *dir, struct dentry *dentry, | |
507 | + struct vfsmount *mnt) | |
508 | +{ | |
509 | + int rc = ccs_rmdir_permission(dentry, mnt); | |
510 | + if (rc) | |
511 | + return rc; | |
512 | + while (!original_security_ops.inode_rmdir) | |
513 | + smp_rmb(); | |
514 | + return original_security_ops.inode_rmdir(dir, dentry, mnt); | |
515 | +} | |
516 | + | |
517 | +/** | |
518 | + * ccs_inode_unlink - Check permission for unlink(). | |
519 | + * | |
520 | + * @dir: Pointer to "struct inode". | |
521 | + * @dentry: Pointer to "struct dentry". | |
522 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
523 | + * | |
524 | + * Returns 0 on success, negative value otherwise. | |
525 | + */ | |
526 | +static int ccs_inode_unlink(struct inode *dir, struct dentry *dentry, | |
527 | + struct vfsmount *mnt) | |
528 | +{ | |
529 | + int rc = ccs_unlink_permission(dentry, mnt); | |
530 | + if (rc) | |
531 | + return rc; | |
532 | + while (!original_security_ops.inode_unlink) | |
533 | + smp_rmb(); | |
534 | + return original_security_ops.inode_unlink(dir, dentry, mnt); | |
535 | +} | |
536 | + | |
537 | +/** | |
538 | + * ccs_inode_symlink - Check permission for symlink(). | |
539 | + * | |
540 | + * @dir: Pointer to "struct inode". | |
541 | + * @dentry: Pointer to "struct dentry". | |
542 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
543 | + * @old_name: Content of symbolic link. | |
544 | + * | |
545 | + * Returns 0 on success, negative value otherwise. | |
546 | + */ | |
547 | +static int ccs_inode_symlink(struct inode *dir, struct dentry *dentry, | |
548 | + struct vfsmount *mnt, const char *old_name) | |
549 | +{ | |
550 | + int rc = ccs_symlink_permission(dentry, mnt, old_name); | |
551 | + if (rc) | |
552 | + return rc; | |
553 | + while (!original_security_ops.inode_symlink) | |
554 | + smp_rmb(); | |
555 | + return original_security_ops.inode_symlink(dir, dentry, mnt, old_name); | |
556 | +} | |
557 | + | |
558 | +/** | |
559 | + * ccs_inode_rename - Check permission for rename(). | |
560 | + * | |
561 | + * @old_dir: Pointer to "struct inode". | |
562 | + * @old_dentry: Pointer to "struct dentry". | |
563 | + * @old_mnt: Pointer to "struct vfsmount". Maybe NULL. | |
564 | + * @new_dir: Pointer to "struct inode". | |
565 | + * @new_dentry: Pointer to "struct dentry". | |
566 | + * @new_mnt: Pointer to "struct vfsmount". Maybe NULL. | |
567 | + * | |
568 | + * Returns 0 on success, negative value otherwise. | |
569 | + */ | |
570 | +static int ccs_inode_rename(struct inode *old_dir, struct dentry *old_dentry, | |
571 | + struct vfsmount *old_mnt, struct inode *new_dir, | |
572 | + struct dentry *new_dentry, | |
573 | + struct vfsmount *new_mnt) | |
574 | +{ | |
575 | + int rc = ccs_rename_permission(old_dentry, new_dentry, new_mnt); | |
576 | + if (rc) | |
577 | + return rc; | |
578 | + while (!original_security_ops.inode_rename) | |
579 | + smp_rmb(); | |
580 | + return original_security_ops.inode_rename(old_dir, old_dentry, old_mnt, | |
581 | + new_dir, new_dentry, | |
582 | + new_mnt); | |
583 | +} | |
584 | + | |
585 | +/** | |
586 | + * ccs_inode_link - Check permission for link(). | |
587 | + * | |
588 | + * @old_dentry: Pointer to "struct dentry". | |
589 | + * @old_mnt: Pointer to "struct vfsmount". Maybe NULL. | |
590 | + * @dir: Pointer to "struct inode". | |
591 | + * @new_dentry: Pointer to "struct dentry". | |
592 | + * @new_mnt: Pointer to "struct vfsmount". Maybe NULL. | |
593 | + * | |
594 | + * Returns 0 on success, negative value otherwise. | |
595 | + */ | |
596 | +static int ccs_inode_link(struct dentry *old_dentry, struct vfsmount *old_mnt, | |
597 | + struct inode *dir, struct dentry *new_dentry, | |
598 | + struct vfsmount *new_mnt) | |
599 | +{ | |
600 | + int rc = ccs_link_permission(old_dentry, new_dentry, new_mnt); | |
601 | + if (rc) | |
602 | + return rc; | |
603 | + while (!original_security_ops.inode_link) | |
604 | + smp_rmb(); | |
605 | + return original_security_ops.inode_link(old_dentry, old_mnt, dir, | |
606 | + new_dentry, new_mnt); | |
607 | +} | |
608 | + | |
609 | +/** | |
610 | + * ccs_inode_create - Check permission for creat(). | |
611 | + * | |
612 | + * @dir: Pointer to "struct inode". | |
613 | + * @dentry: Pointer to "struct dentry". | |
614 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
615 | + * @mode: Create mode. | |
616 | + * | |
617 | + * Returns 0 on success, negative value otherwise. | |
618 | + */ | |
619 | +static int ccs_inode_create(struct inode *dir, struct dentry *dentry, | |
620 | + struct vfsmount *mnt, int mode) | |
621 | +{ | |
622 | + int rc = ccs_mknod_permission(dentry, mnt, mode, 0); | |
623 | + if (rc) | |
624 | + return rc; | |
625 | + while (!original_security_ops.inode_create) | |
626 | + smp_rmb(); | |
627 | + return original_security_ops.inode_create(dir, dentry, mnt, mode); | |
628 | +} | |
629 | + | |
630 | +#ifdef CONFIG_SECURITY_NETWORK | |
631 | + | |
632 | +#include <net/sock.h> | |
633 | + | |
634 | +/* Structure for remembering an accept()ed socket's status. */ | |
635 | +struct ccs_socket_tag { | |
636 | + struct list_head list; | |
637 | + struct inode *inode; | |
638 | + int status; | |
639 | + struct rcu_head rcu; | |
640 | +}; | |
641 | + | |
642 | +/* | |
643 | + * List for managing accept()ed sockets. | |
644 | + * Since we don't need to keep an accept()ed socket into this list after | |
645 | + * once the permission was granted, the number of entries in this list is | |
646 | + * likely small. Therefore, we don't use hash tables. | |
647 | + */ | |
648 | +static LIST_HEAD(ccs_accepted_socket_list); | |
649 | +/* Lock for protecting ccs_accepted_socket_list . */ | |
650 | +static DEFINE_SPINLOCK(ccs_accepted_socket_list_lock); | |
651 | + | |
652 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
653 | + | |
654 | +/** | |
655 | + * ccs_socket_rcu_free - RCU callback for releasing "struct ccs_socket_tag". | |
656 | + * | |
657 | + * @rcu: Pointer to "struct rcu_head". | |
658 | + * | |
659 | + * Returns nothing. | |
660 | + */ | |
661 | +static void ccs_socket_rcu_free(struct rcu_head *rcu) | |
662 | +{ | |
663 | + struct ccs_socket_tag *ptr = container_of(rcu, typeof(*ptr), rcu); | |
664 | + kfree(ptr); | |
665 | +} | |
666 | + | |
667 | +#else | |
668 | + | |
669 | +/** | |
670 | + * ccs_socket_rcu_free - RCU callback for releasing "struct ccs_socket_tag". | |
671 | + * | |
672 | + * @arg: Pointer to "void". | |
673 | + * | |
674 | + * Returns nothing. | |
675 | + */ | |
676 | +static void ccs_socket_rcu_free(void *arg) | |
677 | +{ | |
678 | + struct ccs_socket_tag *ptr = arg; | |
679 | + kfree(ptr); | |
680 | +} | |
681 | + | |
682 | +#endif | |
683 | + | |
684 | +/** | |
685 | + * ccs_update_socket_tag - Update tag associated with accept()ed sockets. | |
686 | + * | |
687 | + * @inode: Pointer to "struct inode". | |
688 | + * @status: New status. | |
689 | + * | |
690 | + * Returns nothing. | |
691 | + * | |
692 | + * If @status == 0, memory for that socket will be released after RCU grace | |
693 | + * period. | |
694 | + */ | |
695 | +static void ccs_update_socket_tag(struct inode *inode, int status) | |
696 | +{ | |
697 | + struct ccs_socket_tag *ptr; | |
698 | + /* | |
699 | + * Protect whole section because multiple threads may call this | |
700 | + * function with same "sock" via ccs_validate_socket(). | |
701 | + */ | |
702 | + spin_lock(&ccs_accepted_socket_list_lock); | |
703 | + rcu_read_lock(); | |
704 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
705 | + if (ptr->inode != inode) | |
706 | + continue; | |
707 | + ptr->status = status; | |
708 | + if (status) | |
709 | + break; | |
710 | + list_del_rcu(&ptr->list); | |
711 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
712 | + call_rcu(&ptr->rcu, ccs_socket_rcu_free); | |
713 | +#else | |
714 | + call_rcu(&ptr->rcu, ccs_socket_rcu_free, ptr); | |
715 | +#endif | |
716 | + break; | |
717 | + } | |
718 | + rcu_read_unlock(); | |
719 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
720 | +} | |
721 | + | |
722 | +/** | |
723 | + * ccs_validate_socket - Check post accept() permission if needed. | |
724 | + * | |
725 | + * @sock: Pointer to "struct socket". | |
726 | + * | |
727 | + * Returns 0 on success, negative value otherwise. | |
728 | + */ | |
729 | +static int ccs_validate_socket(struct socket *sock) | |
730 | +{ | |
731 | + struct inode *inode = SOCK_INODE(sock); | |
732 | + struct ccs_socket_tag *ptr; | |
733 | + int ret = 0; | |
734 | + rcu_read_lock(); | |
735 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
736 | + if (ptr->inode != inode) | |
737 | + continue; | |
738 | + ret = ptr->status; | |
739 | + break; | |
740 | + } | |
741 | + rcu_read_unlock(); | |
742 | + if (ret <= 0) | |
743 | + /* | |
744 | + * This socket is not an accept()ed socket or this socket is | |
745 | + * an accept()ed socket and post accept() permission is done. | |
746 | + */ | |
747 | + return ret; | |
748 | + /* | |
749 | + * Check post accept() permission now. | |
750 | + * | |
751 | + * Strictly speaking, we need to pass both listen()ing socket and | |
752 | + * accept()ed socket to __ccs_socket_post_accept_permission(). | |
753 | + * But since socket's family and type are same for both sockets, | |
754 | + * passing the accept()ed socket in place for the listen()ing socket | |
755 | + * will work. | |
756 | + */ | |
757 | + ret = ccs_socket_post_accept_permission(sock, sock); | |
758 | + /* | |
759 | + * If permission was granted, we forget that this is an accept()ed | |
760 | + * socket. Otherwise, we remember that this socket needs to return | |
761 | + * error for subsequent socketcalls. | |
762 | + */ | |
763 | + ccs_update_socket_tag(inode, ret); | |
764 | + return ret; | |
765 | +} | |
766 | + | |
767 | +/** | |
768 | + * ccs_socket_accept - Check permission for accept(). | |
769 | + * | |
770 | + * @sock: Pointer to "struct socket". | |
771 | + * @newsock: Pointer to "struct socket". | |
772 | + * | |
773 | + * Returns 0 on success, negative value otherwise. | |
774 | + * | |
775 | + * This hook is used for setting up environment for doing post accept() | |
776 | + * permission check. If dereferencing sock->ops->something() were ordered by | |
777 | + * rcu_dereference(), we could replace sock->ops with "a copy of original | |
778 | + * sock->ops with modified sock->ops->accept()" using rcu_assign_pointer() | |
779 | + * in order to do post accept() permission check before returning to userspace. | |
780 | + * If we make the copy in security_socket_post_create(), it would be possible | |
781 | + * to safely replace sock->ops here, but we don't do so because we don't want | |
782 | + * to allocate memory for sockets which do not call sock->ops->accept(). | |
783 | + * Therefore, we do post accept() permission check upon next socket syscalls | |
784 | + * rather than between sock->ops->accept() and returning to userspace. | |
785 | + * This means that if a socket was close()d before calling some socket | |
786 | + * syscalls, post accept() permission check will not be done. | |
787 | + */ | |
788 | +static int ccs_socket_accept(struct socket *sock, struct socket *newsock) | |
789 | +{ | |
790 | + struct ccs_socket_tag *ptr; | |
791 | + int rc = ccs_validate_socket(sock); | |
792 | + if (rc < 0) | |
793 | + return rc; | |
794 | + ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); | |
795 | + if (!ptr) | |
796 | + return -ENOMEM; | |
797 | + while (!original_security_ops.socket_accept) | |
798 | + smp_rmb(); | |
799 | + rc = original_security_ops.socket_accept(sock, newsock); | |
800 | + if (rc) { | |
801 | + kfree(ptr); | |
802 | + return rc; | |
803 | + } | |
804 | + /* | |
805 | + * Subsequent LSM hooks will receive "newsock". Therefore, I mark | |
806 | + * "newsock" as "an accept()ed socket but post accept() permission | |
807 | + * check is not done yet" by allocating memory using inode of the | |
808 | + * "newsock" as a search key. | |
809 | + */ | |
810 | + ptr->inode = SOCK_INODE(newsock); | |
811 | + ptr->status = 1; /* Check post accept() permission later. */ | |
812 | + spin_lock(&ccs_accepted_socket_list_lock); | |
813 | + list_add_tail_rcu(&ptr->list, &ccs_accepted_socket_list); | |
814 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
815 | + return 0; | |
816 | +} | |
817 | + | |
818 | +/** | |
819 | + * ccs_socket_listen - Check permission for listen(). | |
820 | + * | |
821 | + * @sock: Pointer to "struct socket". | |
822 | + * @backlog: Backlog parameter. | |
823 | + * | |
824 | + * Returns 0 on success, negative value otherwise. | |
825 | + */ | |
826 | +static int ccs_socket_listen(struct socket *sock, int backlog) | |
827 | +{ | |
828 | + int rc = ccs_validate_socket(sock); | |
829 | + if (rc < 0) | |
830 | + return rc; | |
831 | + rc = ccs_socket_listen_permission(sock); | |
832 | + if (rc) | |
833 | + return rc; | |
834 | + while (!original_security_ops.socket_listen) | |
835 | + smp_rmb(); | |
836 | + return original_security_ops.socket_listen(sock, backlog); | |
837 | +} | |
838 | + | |
839 | +/** | |
840 | + * ccs_socket_connect - Check permission for connect(). | |
841 | + * | |
842 | + * @sock: Pointer to "struct socket". | |
843 | + * @addr: Pointer to "struct sockaddr". | |
844 | + * @addr_len: Size of @addr. | |
845 | + * | |
846 | + * Returns 0 on success, negative value otherwise. | |
847 | + */ | |
848 | +static int ccs_socket_connect(struct socket *sock, struct sockaddr *addr, | |
849 | + int addr_len) | |
850 | +{ | |
851 | + int rc = ccs_validate_socket(sock); | |
852 | + if (rc < 0) | |
853 | + return rc; | |
854 | + rc = ccs_socket_connect_permission(sock, addr, addr_len); | |
855 | + if (rc) | |
856 | + return rc; | |
857 | + while (!original_security_ops.socket_connect) | |
858 | + smp_rmb(); | |
859 | + return original_security_ops.socket_connect(sock, addr, addr_len); | |
860 | +} | |
861 | + | |
862 | +/** | |
863 | + * ccs_socket_bind - Check permission for bind(). | |
864 | + * | |
865 | + * @sock: Pointer to "struct socket". | |
866 | + * @addr: Pointer to "struct sockaddr". | |
867 | + * @addr_len: Size of @addr. | |
868 | + * | |
869 | + * Returns 0 on success, negative value otherwise. | |
870 | + */ | |
871 | +static int ccs_socket_bind(struct socket *sock, struct sockaddr *addr, | |
872 | + int addr_len) | |
873 | +{ | |
874 | + int rc = ccs_validate_socket(sock); | |
875 | + if (rc < 0) | |
876 | + return rc; | |
877 | + rc = ccs_socket_bind_permission(sock, addr, addr_len); | |
878 | + if (rc) | |
879 | + return rc; | |
880 | + while (!original_security_ops.socket_bind) | |
881 | + smp_rmb(); | |
882 | + return original_security_ops.socket_bind(sock, addr, addr_len); | |
883 | +} | |
884 | + | |
885 | +/** | |
886 | + * ccs_socket_sendmsg - Check permission for sendmsg(). | |
887 | + * | |
888 | + * @sock: Pointer to "struct socket". | |
889 | + * @msg: Pointer to "struct msghdr". | |
890 | + * @size: Size of message. | |
891 | + * | |
892 | + * Returns 0 on success, negative value otherwise. | |
893 | + */ | |
894 | +static int ccs_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
895 | + int size) | |
896 | +{ | |
897 | + int rc = ccs_validate_socket(sock); | |
898 | + if (rc < 0) | |
899 | + return rc; | |
900 | + rc = ccs_socket_sendmsg_permission(sock, msg, size); | |
901 | + if (rc) | |
902 | + return rc; | |
903 | + while (!original_security_ops.socket_sendmsg) | |
904 | + smp_rmb(); | |
905 | + return original_security_ops.socket_sendmsg(sock, msg, size); | |
906 | +} | |
907 | + | |
908 | +/** | |
909 | + * ccs_socket_recvmsg - Check permission for recvmsg(). | |
910 | + * | |
911 | + * @sock: Pointer to "struct socket". | |
912 | + * @msg: Pointer to "struct msghdr". | |
913 | + * @size: Size of message. | |
914 | + * @flags: Flags. | |
915 | + * | |
916 | + * Returns 0 on success, negative value otherwise. | |
917 | + */ | |
918 | +static int ccs_socket_recvmsg(struct socket *sock, struct msghdr *msg, | |
919 | + int size, int flags) | |
920 | +{ | |
921 | + int rc = ccs_validate_socket(sock); | |
922 | + if (rc < 0) | |
923 | + return rc; | |
924 | + while (!original_security_ops.socket_recvmsg) | |
925 | + smp_rmb(); | |
926 | + return original_security_ops.socket_recvmsg(sock, msg, size, flags); | |
927 | +} | |
928 | + | |
929 | +/** | |
930 | + * ccs_socket_getsockname - Check permission for getsockname(). | |
931 | + * | |
932 | + * @sock: Pointer to "struct socket". | |
933 | + * | |
934 | + * Returns 0 on success, negative value otherwise. | |
935 | + */ | |
936 | +static int ccs_socket_getsockname(struct socket *sock) | |
937 | +{ | |
938 | + int rc = ccs_validate_socket(sock); | |
939 | + if (rc < 0) | |
940 | + return rc; | |
941 | + while (!original_security_ops.socket_getsockname) | |
942 | + smp_rmb(); | |
943 | + return original_security_ops.socket_getsockname(sock); | |
944 | +} | |
945 | + | |
946 | +/** | |
947 | + * ccs_socket_getpeername - Check permission for getpeername(). | |
948 | + * | |
949 | + * @sock: Pointer to "struct socket". | |
950 | + * | |
951 | + * Returns 0 on success, negative value otherwise. | |
952 | + */ | |
953 | +static int ccs_socket_getpeername(struct socket *sock) | |
954 | +{ | |
955 | + int rc = ccs_validate_socket(sock); | |
956 | + if (rc < 0) | |
957 | + return rc; | |
958 | + while (!original_security_ops.socket_getpeername) | |
959 | + smp_rmb(); | |
960 | + return original_security_ops.socket_getpeername(sock); | |
961 | +} | |
962 | + | |
963 | +/** | |
964 | + * ccs_socket_getsockopt - Check permission for getsockopt(). | |
965 | + * | |
966 | + * @sock: Pointer to "struct socket". | |
967 | + * @level: Level. | |
968 | + * @optname: Option's name, | |
969 | + * | |
970 | + * Returns 0 on success, negative value otherwise. | |
971 | + */ | |
972 | +static int ccs_socket_getsockopt(struct socket *sock, int level, int optname) | |
973 | +{ | |
974 | + int rc = ccs_validate_socket(sock); | |
975 | + if (rc < 0) | |
976 | + return rc; | |
977 | + while (!original_security_ops.socket_getsockopt) | |
978 | + smp_rmb(); | |
979 | + return original_security_ops.socket_getsockopt(sock, level, optname); | |
980 | +} | |
981 | + | |
982 | +/** | |
983 | + * ccs_socket_setsockopt - Check permission for setsockopt(). | |
984 | + * | |
985 | + * @sock: Pointer to "struct socket". | |
986 | + * @level: Level. | |
987 | + * @optname: Option's name, | |
988 | + * | |
989 | + * Returns 0 on success, negative value otherwise. | |
990 | + */ | |
991 | +static int ccs_socket_setsockopt(struct socket *sock, int level, int optname) | |
992 | +{ | |
993 | + int rc = ccs_validate_socket(sock); | |
994 | + if (rc < 0) | |
995 | + return rc; | |
996 | + while (!original_security_ops.socket_setsockopt) | |
997 | + smp_rmb(); | |
998 | + return original_security_ops.socket_setsockopt(sock, level, optname); | |
999 | +} | |
1000 | + | |
1001 | +/** | |
1002 | + * ccs_socket_shutdown - Check permission for shutdown(). | |
1003 | + * | |
1004 | + * @sock: Pointer to "struct socket". | |
1005 | + * @how: Shutdown mode. | |
1006 | + * | |
1007 | + * Returns 0 on success, negative value otherwise. | |
1008 | + */ | |
1009 | +static int ccs_socket_shutdown(struct socket *sock, int how) | |
1010 | +{ | |
1011 | + int rc = ccs_validate_socket(sock); | |
1012 | + if (rc < 0) | |
1013 | + return rc; | |
1014 | + while (!original_security_ops.socket_shutdown) | |
1015 | + smp_rmb(); | |
1016 | + return original_security_ops.socket_shutdown(sock, how); | |
1017 | +} | |
1018 | + | |
1019 | +#define SOCKFS_MAGIC 0x534F434B | |
1020 | + | |
1021 | +/** | |
1022 | + * ccs_inode_free_security - Release memory associated with an inode. | |
1023 | + * | |
1024 | + * @inode: Pointer to "struct inode". | |
1025 | + * | |
1026 | + * Returns nothing. | |
1027 | + * | |
1028 | + * We use this hook for releasing memory associated with an accept()ed socket. | |
1029 | + */ | |
1030 | +static void ccs_inode_free_security(struct inode *inode) | |
1031 | +{ | |
1032 | + while (!original_security_ops.inode_free_security) | |
1033 | + smp_rmb(); | |
1034 | + original_security_ops.inode_free_security(inode); | |
1035 | + if (inode->i_sb && inode->i_sb->s_magic == SOCKFS_MAGIC) | |
1036 | + ccs_update_socket_tag(inode, 0); | |
1037 | +} | |
1038 | + | |
1039 | +#endif | |
1040 | + | |
1041 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) | |
1042 | + | |
1043 | +/** | |
1044 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
1045 | + * | |
1046 | + * @old_nd: Pointer to "struct nameidata". | |
1047 | + * @new_nd: Pointer to "struct nameidata". | |
1048 | + * | |
1049 | + * Returns 0 on success, negative value otherwise. | |
1050 | + */ | |
1051 | +static int ccs_sb_pivotroot(struct nameidata *old_nd, struct nameidata *new_nd) | |
1052 | +{ | |
1053 | + int rc = ccs_pivot_root_permission(old_nd, new_nd); | |
1054 | + if (rc) | |
1055 | + return rc; | |
1056 | + while (!original_security_ops.sb_pivotroot) | |
1057 | + smp_rmb(); | |
1058 | + return original_security_ops.sb_pivotroot(old_nd, new_nd); | |
1059 | +} | |
1060 | + | |
1061 | +/** | |
1062 | + * ccs_sb_mount - Check permission for mount(). | |
1063 | + * | |
1064 | + * @dev_name: Name of device file. | |
1065 | + * @nd: Pointer to "struct nameidata". | |
1066 | + * @type: Name of filesystem type. Maybe NULL. | |
1067 | + * @flags: Mount options. | |
1068 | + * @data_page: Optional data. Maybe NULL. | |
1069 | + * | |
1070 | + * Returns 0 on success, negative value otherwise. | |
1071 | + */ | |
1072 | +static int ccs_sb_mount(char *dev_name, struct nameidata *nd, char *type, | |
1073 | + unsigned long flags, void *data_page) | |
1074 | +{ | |
1075 | + int rc = ccs_mount_permission(dev_name, nd, type, flags, data_page); | |
1076 | + if (rc) | |
1077 | + return rc; | |
1078 | + while (!original_security_ops.sb_mount) | |
1079 | + smp_rmb(); | |
1080 | + return original_security_ops.sb_mount(dev_name, nd, type, flags, | |
1081 | + data_page); | |
1082 | +} | |
1083 | + | |
1084 | +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26) | |
1085 | + | |
1086 | +/** | |
1087 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
1088 | + * | |
1089 | + * @old_nd: Pointer to "struct nameidata". | |
1090 | + * @new_nd: Pointer to "struct nameidata". | |
1091 | + * | |
1092 | + * Returns 0 on success, negative value otherwise. | |
1093 | + */ | |
1094 | +static int ccs_sb_pivotroot(struct nameidata *old_nd, struct nameidata *new_nd) | |
1095 | +{ | |
1096 | + int rc = ccs_pivot_root_permission(&old_nd->path, &new_nd->path); | |
1097 | + if (rc) | |
1098 | + return rc; | |
1099 | + while (!original_security_ops.sb_pivotroot) | |
1100 | + smp_rmb(); | |
1101 | + return original_security_ops.sb_pivotroot(old_nd, new_nd); | |
1102 | +} | |
1103 | + | |
1104 | +/** | |
1105 | + * ccs_sb_mount - Check permission for mount(). | |
1106 | + * | |
1107 | + * @dev_name: Name of device file. | |
1108 | + * @nd: Pointer to "struct nameidata". | |
1109 | + * @type: Name of filesystem type. Maybe NULL. | |
1110 | + * @flags: Mount options. | |
1111 | + * @data_page: Optional data. Maybe NULL. | |
1112 | + * | |
1113 | + * Returns 0 on success, negative value otherwise. | |
1114 | + */ | |
1115 | +static int ccs_sb_mount(char *dev_name, struct nameidata *nd, char *type, | |
1116 | + unsigned long flags, void *data_page) | |
1117 | +{ | |
1118 | + int rc = ccs_mount_permission(dev_name, &nd->path, type, flags, | |
1119 | + data_page); | |
1120 | + if (rc) | |
1121 | + return rc; | |
1122 | + while (!original_security_ops.sb_mount) | |
1123 | + smp_rmb(); | |
1124 | + return original_security_ops.sb_mount(dev_name, nd, type, flags, | |
1125 | + data_page); | |
1126 | +} | |
1127 | + | |
1128 | +#else | |
1129 | + | |
1130 | +/** | |
1131 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
1132 | + * | |
1133 | + * @old_path: Pointer to "struct path". | |
1134 | + * @new_path: Pointer to "struct path". | |
1135 | + * | |
1136 | + * Returns 0 on success, negative value otherwise. | |
1137 | + */ | |
1138 | +static int ccs_sb_pivotroot(struct path *old_path, struct path *new_path) | |
1139 | +{ | |
1140 | + int rc = ccs_pivot_root_permission(old_path, new_path); | |
1141 | + if (rc) | |
1142 | + return rc; | |
1143 | + while (!original_security_ops.sb_pivotroot) | |
1144 | + smp_rmb(); | |
1145 | + return original_security_ops.sb_pivotroot(old_path, new_path); | |
1146 | +} | |
1147 | + | |
1148 | +/** | |
1149 | + * ccs_sb_mount - Check permission for mount(). | |
1150 | + * | |
1151 | + * @dev_name: Name of device file. | |
1152 | + * @path: Pointer to "struct path". | |
1153 | + * @type: Name of filesystem type. Maybe NULL. | |
1154 | + * @flags: Mount options. | |
1155 | + * @data_page: Optional data. Maybe NULL. | |
1156 | + * | |
1157 | + * Returns 0 on success, negative value otherwise. | |
1158 | + */ | |
1159 | +static int ccs_sb_mount(char *dev_name, struct path *path, char *type, | |
1160 | + unsigned long flags, void *data_page) | |
1161 | +{ | |
1162 | + int rc = ccs_mount_permission(dev_name, path, type, flags, data_page); | |
1163 | + if (rc) | |
1164 | + return rc; | |
1165 | + while (!original_security_ops.sb_mount) | |
1166 | + smp_rmb(); | |
1167 | + return original_security_ops.sb_mount(dev_name, path, type, flags, | |
1168 | + data_page); | |
1169 | +} | |
1170 | + | |
1171 | +#endif | |
1172 | + | |
1173 | +/** | |
1174 | + * ccs_sb_umount - Check permission for umount(). | |
1175 | + * | |
1176 | + * @mnt: Pointer to "struct vfsmount". | |
1177 | + * @flags: Unmount flags. | |
1178 | + * | |
1179 | + * Returns 0 on success, negative value otherwise. | |
1180 | + */ | |
1181 | +static int ccs_sb_umount(struct vfsmount *mnt, int flags) | |
1182 | +{ | |
1183 | + int rc = ccs_umount_permission(mnt, flags); | |
1184 | + if (rc) | |
1185 | + return rc; | |
1186 | + while (!original_security_ops.sb_umount) | |
1187 | + smp_rmb(); | |
1188 | + return original_security_ops.sb_umount(mnt, flags); | |
1189 | +} | |
1190 | + | |
1191 | +/** | |
1192 | + * ccs_file_fcntl - Check permission for fcntl(). | |
1193 | + * | |
1194 | + * @file: Pointer to "struct file". | |
1195 | + * @cmd: Command number. | |
1196 | + * @arg: Value for @cmd. | |
1197 | + * | |
1198 | + * Returns 0 on success, negative value otherwise. | |
1199 | + */ | |
1200 | +static int ccs_file_fcntl(struct file *file, unsigned int cmd, | |
1201 | + unsigned long arg) | |
1202 | +{ | |
1203 | + int rc = ccs_fcntl_permission(file, cmd, arg); | |
1204 | + if (rc) | |
1205 | + return rc; | |
1206 | + while (!original_security_ops.file_fcntl) | |
1207 | + smp_rmb(); | |
1208 | + return original_security_ops.file_fcntl(file, cmd, arg); | |
1209 | +} | |
1210 | + | |
1211 | +/** | |
1212 | + * ccs_file_ioctl - Check permission for ioctl(). | |
1213 | + * | |
1214 | + * @filp: Pointer to "struct file". | |
1215 | + * @cmd: Command number. | |
1216 | + * @arg: Value for @cmd. | |
1217 | + * | |
1218 | + * Returns 0 on success, negative value otherwise. | |
1219 | + */ | |
1220 | +static int ccs_file_ioctl(struct file *filp, unsigned int cmd, | |
1221 | + unsigned long arg) | |
1222 | +{ | |
1223 | + int rc = ccs_ioctl_permission(filp, cmd, arg); | |
1224 | + if (rc) | |
1225 | + return rc; | |
1226 | + while (!original_security_ops.file_ioctl) | |
1227 | + smp_rmb(); | |
1228 | + return original_security_ops.file_ioctl(filp, cmd, arg); | |
1229 | +} | |
1230 | + | |
1231 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) && defined(CONFIG_SYSCTL_SYSCALL) | |
1232 | +int ccs_path_permission(struct ccs_request_info *r, u8 operation, | |
1233 | + const struct ccs_path_info *filename); | |
1234 | + | |
1235 | +/** | |
1236 | + * ccs_prepend - Copy of prepend() in fs/dcache.c. | |
1237 | + * | |
1238 | + * @buffer: Pointer to "struct char *". | |
1239 | + * @buflen: Pointer to int which holds size of @buffer. | |
1240 | + * @str: String to copy. | |
1241 | + * | |
1242 | + * Returns 0 on success, negative value otherwise. | |
1243 | + * | |
1244 | + * @buffer and @buflen are updated upon success. | |
1245 | + */ | |
1246 | +static int ccs_prepend(char **buffer, int *buflen, const char *str) | |
1247 | +{ | |
1248 | + int namelen = strlen(str); | |
1249 | + if (*buflen < namelen) | |
1250 | + return -ENOMEM; | |
1251 | + *buflen -= namelen; | |
1252 | + *buffer -= namelen; | |
1253 | + memcpy(*buffer, str, namelen); | |
1254 | + return 0; | |
1255 | +} | |
1256 | + | |
1257 | +/** | |
1258 | + * ccs_sysctl_permission - Check permission for sysctl(). | |
1259 | + * | |
1260 | + * @table: Pointer to "struct ctl_table". | |
1261 | + * @op: Operation. (MAY_READ and/or MAY_WRITE) | |
1262 | + * | |
1263 | + * Returns 0 on success, negative value otherwise. | |
1264 | + */ | |
1265 | +static int ccs_sysctl(struct ctl_table *table, int op) | |
1266 | +{ | |
1267 | + int error; | |
1268 | + struct ccs_path_info buf; | |
1269 | + struct ccs_request_info r; | |
1270 | + int buflen; | |
1271 | + char *buffer; | |
1272 | + int idx; | |
1273 | + while (!original_security_ops.sysctl) | |
1274 | + smp_rmb(); | |
1275 | + error = original_security_ops.sysctl(table, op); | |
1276 | + if (error) | |
1277 | + return error; | |
1278 | + op &= MAY_READ | MAY_WRITE; | |
1279 | + if (!op) | |
1280 | + return 0; | |
1281 | + buffer = NULL; | |
1282 | + buf.name = NULL; | |
1283 | + idx = ccs_read_lock(); | |
1284 | + if (ccs_init_request_info(&r, CCS_MAC_FILE_OPEN) | |
1285 | + == CCS_CONFIG_DISABLED) | |
1286 | + goto out; | |
1287 | + error = -ENOMEM; | |
1288 | + buflen = 4096; | |
1289 | + buffer = kmalloc(buflen, CCS_GFP_FLAGS); | |
1290 | + if (buffer) { | |
1291 | + char *end = buffer + buflen; | |
1292 | + *--end = '\0'; | |
1293 | + buflen--; | |
1294 | + while (table) { | |
1295 | + char num[32]; | |
1296 | + const char *sp = table->procname; | |
1297 | + if (!sp) { | |
1298 | + memset(num, 0, sizeof(num)); | |
1299 | + snprintf(num, sizeof(num) - 1, "=%d=", | |
1300 | + table->ctl_name); | |
1301 | + sp = num; | |
1302 | + } | |
1303 | + if (ccs_prepend(&end, &buflen, sp) || | |
1304 | + ccs_prepend(&end, &buflen, "/")) | |
1305 | + goto out; | |
1306 | + table = table->parent; | |
1307 | + } | |
1308 | + if (ccs_prepend(&end, &buflen, "proc:/sys")) | |
1309 | + goto out; | |
1310 | + buf.name = ccs_encode(end); | |
1311 | + } | |
1312 | + if (buf.name) { | |
1313 | + ccs_fill_path_info(&buf); | |
1314 | + if (op & MAY_READ) | |
1315 | + error = ccs_path_permission(&r, CCS_TYPE_READ, &buf); | |
1316 | + else | |
1317 | + error = 0; | |
1318 | + if (!error && (op & MAY_WRITE)) | |
1319 | + error = ccs_path_permission(&r, CCS_TYPE_WRITE, &buf); | |
1320 | + } | |
1321 | +out: | |
1322 | + ccs_read_unlock(idx); | |
1323 | + kfree(buf.name); | |
1324 | + kfree(buffer); | |
1325 | + return error; | |
1326 | +} | |
1327 | + | |
1328 | +#endif | |
1329 | + | |
1330 | +/* | |
1331 | + * Why not to copy all operations by "original_security_ops = *ops" ? | |
1332 | + * Because copying byte array is not atomic. Reader checks | |
1333 | + * original_security_ops.op != NULL before doing original_security_ops.op(). | |
1334 | + * Thus, modifying original_security_ops.op has to be atomic. | |
1335 | + */ | |
1336 | +#define swap_security_ops(op) \ | |
1337 | + original_security_ops.op = ops->op; smp_wmb(); ops->op = ccs_##op; | |
1338 | + | |
1339 | +/** | |
1340 | + * ccs_update_security_ops - Overwrite original "struct security_operations". | |
1341 | + * | |
1342 | + * @ops: Pointer to "struct security_operations". | |
1343 | + * | |
1344 | + * Returns nothing. | |
1345 | + */ | |
1346 | +static void __init ccs_update_security_ops(struct security_operations *ops) | |
1347 | +{ | |
1348 | + /* Security context allocator. */ | |
1349 | + swap_security_ops(task_alloc_security); | |
1350 | + swap_security_ops(task_free_security); | |
1351 | + swap_security_ops(bprm_alloc_security); | |
1352 | + swap_security_ops(bprm_free_security); | |
1353 | + /* Security context updater for successful execve(). */ | |
1354 | + swap_security_ops(bprm_check_security); | |
1355 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 6) | |
1356 | + swap_security_ops(bprm_compute_creds); | |
1357 | +#else | |
1358 | + swap_security_ops(bprm_apply_creds); | |
1359 | +#endif | |
1360 | + /* Various permission checker. */ | |
1361 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
1362 | + swap_security_ops(dentry_open); | |
1363 | +#else | |
1364 | + swap_security_ops(inode_permission); | |
1365 | +#endif | |
1366 | + swap_security_ops(file_fcntl); | |
1367 | + swap_security_ops(file_ioctl); | |
1368 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) && defined(CONFIG_SYSCTL_SYSCALL) | |
1369 | + swap_security_ops(sysctl); | |
1370 | +#endif | |
1371 | + swap_security_ops(sb_pivotroot); | |
1372 | + swap_security_ops(sb_mount); | |
1373 | + swap_security_ops(sb_umount); | |
1374 | + swap_security_ops(inode_mknod); | |
1375 | + swap_security_ops(inode_mkdir); | |
1376 | + swap_security_ops(inode_rmdir); | |
1377 | + swap_security_ops(inode_unlink); | |
1378 | + swap_security_ops(inode_symlink); | |
1379 | + swap_security_ops(inode_rename); | |
1380 | + swap_security_ops(inode_link); | |
1381 | + swap_security_ops(inode_create); | |
1382 | + swap_security_ops(inode_setattr); | |
1383 | + swap_security_ops(inode_getattr); | |
1384 | +#ifdef CONFIG_SECURITY_NETWORK | |
1385 | + swap_security_ops(socket_bind); | |
1386 | + swap_security_ops(socket_connect); | |
1387 | + swap_security_ops(socket_listen); | |
1388 | + swap_security_ops(socket_sendmsg); | |
1389 | + swap_security_ops(socket_recvmsg); | |
1390 | + swap_security_ops(socket_getsockname); | |
1391 | + swap_security_ops(socket_getpeername); | |
1392 | + swap_security_ops(socket_getsockopt); | |
1393 | + swap_security_ops(socket_setsockopt); | |
1394 | + swap_security_ops(socket_shutdown); | |
1395 | + swap_security_ops(socket_accept); | |
1396 | + swap_security_ops(inode_free_security); | |
1397 | +#endif | |
1398 | +} | |
1399 | + | |
1400 | +#undef swap_security_ops | |
1401 | + | |
1402 | +/** | |
1403 | + * ccs_init - Initialize this module. | |
1404 | + * | |
1405 | + * Returns 0 on success, negative value otherwise. | |
1406 | + */ | |
1407 | +static int __init ccs_init(void) | |
1408 | +{ | |
1409 | + struct security_operations *ops = probe_security_ops(); | |
1410 | + if (!ops) | |
1411 | + goto out; | |
1412 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
1413 | + ccsecurity_exports.find_task_by_vpid = probe_find_task_by_vpid(); | |
1414 | + if (!ccsecurity_exports.find_task_by_vpid) | |
1415 | + goto out; | |
1416 | + ccsecurity_exports.find_task_by_pid_ns = probe_find_task_by_pid_ns(); | |
1417 | + if (!ccsecurity_exports.find_task_by_pid_ns) | |
1418 | + goto out; | |
1419 | +#endif | |
1420 | + ccsecurity_exports.vfsmount_lock = probe_vfsmount_lock(); | |
1421 | + if (!ccsecurity_exports.vfsmount_lock) | |
1422 | + goto out; | |
1423 | + ccs_main_init(); | |
1424 | + ccs_update_security_ops(ops); | |
1425 | + printk(KERN_INFO "AKARI: 1.0.39 2019/08/20\n"); | |
1426 | + printk(KERN_INFO | |
1427 | + "Access Keeping And Regulating Instrument registered.\n"); | |
1428 | + return 0; | |
1429 | +out: | |
1430 | + return -EINVAL; | |
1431 | +} | |
1432 | + | |
1433 | +module_init(ccs_init); | |
1434 | +MODULE_LICENSE("GPL"); | |
1435 | + | |
1436 | +/** | |
1437 | + * ccs_used_by_cred - Check whether the given domain is in use or not. | |
1438 | + * | |
1439 | + * @domain: Pointer to "struct ccs_domain_info". | |
1440 | + * | |
1441 | + * Returns true if @domain is in use, false otherwise. | |
1442 | + * | |
1443 | + * Caller holds rcu_read_lock(). | |
1444 | + */ | |
1445 | +bool ccs_used_by_cred(const struct ccs_domain_info *domain) | |
1446 | +{ | |
1447 | + return false; | |
1448 | +} | |
1449 | + | |
1450 | +/** | |
1451 | + * ccs_add_task_security - Add "struct ccs_security" to list. | |
1452 | + * | |
1453 | + * @ptr: Pointer to "struct ccs_security". | |
1454 | + * @list: Pointer to "struct list_head". | |
1455 | + * | |
1456 | + * Returns nothing. | |
1457 | + */ | |
1458 | +static void ccs_add_task_security(struct ccs_security *ptr, | |
1459 | + struct list_head *list) | |
1460 | +{ | |
1461 | + unsigned long flags; | |
1462 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
1463 | + list_add_rcu(&ptr->list, list); | |
1464 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
1465 | +} | |
1466 | + | |
1467 | +/** | |
1468 | + * __ccs_alloc_task_security - Allocate memory for new tasks. | |
1469 | + * | |
1470 | + * @task: Pointer to "struct task_struct". | |
1471 | + * | |
1472 | + * Returns 0 on success, negative value otherwise. | |
1473 | + */ | |
1474 | +static int __ccs_alloc_task_security(const struct task_struct *task) | |
1475 | +{ | |
1476 | + struct ccs_security *old_security = ccs_current_security(); | |
1477 | + struct ccs_security *new_security = kzalloc(sizeof(*new_security), | |
1478 | + GFP_KERNEL); | |
1479 | + struct list_head *list = &ccs_task_security_list | |
1480 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
1481 | + if (!new_security) | |
1482 | + return -ENOMEM; | |
1483 | + new_security->task = task; | |
1484 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
1485 | + new_security->ccs_flags = old_security->ccs_flags; | |
1486 | + ccs_add_task_security(new_security, list); | |
1487 | + return 0; | |
1488 | +} | |
1489 | + | |
1490 | +/** | |
1491 | + * ccs_find_task_security - Find "struct ccs_security" for given task. | |
1492 | + * | |
1493 | + * @task: Pointer to "struct task_struct". | |
1494 | + * | |
1495 | + * Returns pointer to "struct ccs_security" on success, &ccs_oom_security on | |
1496 | + * out of memory, &ccs_default_security otherwise. | |
1497 | + * | |
1498 | + * If @task is current thread and "struct ccs_security" for current thread was | |
1499 | + * not found, I try to allocate it. But if allocation failed, current thread | |
1500 | + * will be killed by SIGKILL. Note that if current->pid == 1, sending SIGKILL | |
1501 | + * won't work. | |
1502 | + */ | |
1503 | +struct ccs_security *ccs_find_task_security(const struct task_struct *task) | |
1504 | +{ | |
1505 | + struct ccs_security *ptr; | |
1506 | + struct list_head *list = &ccs_task_security_list | |
1507 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
1508 | + /* Make sure INIT_LIST_HEAD() in ccs_mm_init() takes effect. */ | |
1509 | + while (!list->next) | |
1510 | + smp_rmb(); | |
1511 | + rcu_read_lock(); | |
1512 | + list_for_each_entry_rcu(ptr, list, list) { | |
1513 | + if (ptr->task != task) | |
1514 | + continue; | |
1515 | + rcu_read_unlock(); | |
1516 | + return ptr; | |
1517 | + } | |
1518 | + rcu_read_unlock(); | |
1519 | + if (task != current) | |
1520 | + return &ccs_default_security; | |
1521 | + /* Use GFP_ATOMIC because caller may have called rcu_read_lock(). */ | |
1522 | + ptr = kzalloc(sizeof(*ptr), GFP_ATOMIC); | |
1523 | + if (!ptr) { | |
1524 | + printk(KERN_WARNING "Unable to allocate memory for pid=%u\n", | |
1525 | + task->pid); | |
1526 | + send_sig(SIGKILL, current, 0); | |
1527 | + return &ccs_oom_security; | |
1528 | + } | |
1529 | + *ptr = ccs_default_security; | |
1530 | + ptr->task = task; | |
1531 | + ccs_add_task_security(ptr, list); | |
1532 | + return ptr; | |
1533 | +} | |
1534 | + | |
1535 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
1536 | + | |
1537 | +/** | |
1538 | + * ccs_rcu_free - RCU callback for releasing "struct ccs_security". | |
1539 | + * | |
1540 | + * @rcu: Pointer to "struct rcu_head". | |
1541 | + * | |
1542 | + * Returns nothing. | |
1543 | + */ | |
1544 | +static void ccs_rcu_free(struct rcu_head *rcu) | |
1545 | +{ | |
1546 | + struct ccs_security *ptr = container_of(rcu, typeof(*ptr), rcu); | |
1547 | + kfree(ptr); | |
1548 | +} | |
1549 | + | |
1550 | +#else | |
1551 | + | |
1552 | +/** | |
1553 | + * ccs_rcu_free - RCU callback for releasing "struct ccs_security". | |
1554 | + * | |
1555 | + * @arg: Pointer to "void". | |
1556 | + * | |
1557 | + * Returns nothing. | |
1558 | + */ | |
1559 | +static void ccs_rcu_free(void *arg) | |
1560 | +{ | |
1561 | + struct ccs_security *ptr = arg; | |
1562 | + kfree(ptr); | |
1563 | +} | |
1564 | + | |
1565 | +#endif | |
1566 | + | |
1567 | +/** | |
1568 | + * __ccs_free_task_security - Release memory associated with "struct task_struct". | |
1569 | + * | |
1570 | + * @task: Pointer to "struct task_struct". | |
1571 | + * | |
1572 | + * Returns nothing. | |
1573 | + */ | |
1574 | +static void __ccs_free_task_security(const struct task_struct *task) | |
1575 | +{ | |
1576 | + unsigned long flags; | |
1577 | + struct ccs_security *ptr = ccs_find_task_security(task); | |
1578 | + if (ptr == &ccs_default_security || ptr == &ccs_oom_security) | |
1579 | + return; | |
1580 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
1581 | + list_del_rcu(&ptr->list); | |
1582 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
1583 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
1584 | + call_rcu(&ptr->rcu, ccs_rcu_free); | |
1585 | +#else | |
1586 | + call_rcu(&ptr->rcu, ccs_rcu_free, ptr); | |
1587 | +#endif | |
1588 | +} |
@@ -0,0 +1,1568 @@ | ||
1 | +/* | |
2 | + * lsm.c | |
3 | + * | |
4 | + * Copyright (C) 2010-2015 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | |
5 | + * | |
6 | + * Version: 1.0.39 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include "internal.h" | |
10 | +#include "probe.h" | |
11 | + | |
12 | +/* Prototype definition. */ | |
13 | + | |
14 | +static int __ccs_alloc_task_security(const struct task_struct *task); | |
15 | +static void __ccs_free_task_security(const struct task_struct *task); | |
16 | + | |
17 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
18 | +static struct ccs_security ccs_oom_security = { | |
19 | + .ccs_domain_info = &ccs_kernel_domain | |
20 | +}; | |
21 | + | |
22 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
23 | +static struct ccs_security ccs_default_security = { | |
24 | + .ccs_domain_info = &ccs_kernel_domain | |
25 | +}; | |
26 | + | |
27 | +/* List of "struct ccs_security". */ | |
28 | +struct list_head ccs_task_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
29 | +/* Lock for protecting ccs_task_security_list[]. */ | |
30 | +static DEFINE_SPINLOCK(ccs_task_security_list_lock); | |
31 | + | |
32 | +/* Dummy marker for calling security_bprm_free(). */ | |
33 | +static const unsigned long ccs_bprm_security; | |
34 | + | |
35 | +/* For exporting variables and functions. */ | |
36 | +struct ccsecurity_exports ccsecurity_exports; | |
37 | +/* Members are updated by loadable kernel module. */ | |
38 | +struct ccsecurity_operations ccsecurity_ops; | |
39 | + | |
40 | +/* Function pointers originally registered by register_security(). */ | |
41 | +static struct security_operations original_security_ops /* = *security_ops; */; | |
42 | + | |
43 | +#ifdef CONFIG_AKARI_TRACE_EXECVE_COUNT | |
44 | + | |
45 | +/** | |
46 | + * ccs_update_ee_counter - Update "struct ccs_execve" counter. | |
47 | + * | |
48 | + * @count: Count to increment or decrement. | |
49 | + * | |
50 | + * Returns updated counter. | |
51 | + */ | |
52 | +static unsigned int ccs_update_ee_counter(int count) | |
53 | +{ | |
54 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10) || defined(atomic_add_return) | |
55 | + /* Debug counter for detecting "struct ccs_execve" memory leak. */ | |
56 | + static atomic_t ccs_ee_counter = ATOMIC_INIT(0); | |
57 | + return atomic_add_return(count, &ccs_ee_counter); | |
58 | +#else | |
59 | + static DEFINE_SPINLOCK(ccs_ee_lock); | |
60 | + static unsigned int ccs_ee_counter; | |
61 | + unsigned long flags; | |
62 | + spin_lock_irqsave(&ccs_ee_lock, flags); | |
63 | + ccs_ee_counter += count; | |
64 | + count = ccs_ee_counter; | |
65 | + spin_unlock_irqrestore(&ccs_ee_lock, flags); | |
66 | + return count; | |
67 | +#endif | |
68 | +} | |
69 | + | |
70 | +/** | |
71 | + * ccs_audit_alloc_execve - Audit allocation of "struct ccs_execve". | |
72 | + * | |
73 | + * @ee: Pointer to "struct ccs_execve". | |
74 | + * | |
75 | + * Returns nothing. | |
76 | + */ | |
77 | +void ccs_audit_alloc_execve(const struct ccs_execve * const ee) | |
78 | +{ | |
79 | + printk(KERN_INFO "AKARI: Allocated %p by pid=%u (count=%u)\n", ee, | |
80 | + current->pid, ccs_update_ee_counter(1) - 1); | |
81 | +} | |
82 | + | |
83 | +/** | |
84 | + * ccs_audit_free_execve - Audit release of "struct ccs_execve". | |
85 | + * | |
86 | + * @ee: Pointer to "struct ccs_execve". | |
87 | + * @task: True if released by current task, false otherwise. | |
88 | + * | |
89 | + * Returns nothing. | |
90 | + */ | |
91 | +void ccs_audit_free_execve(const struct ccs_execve * const ee, | |
92 | + const bool is_current) | |
93 | +{ | |
94 | + const unsigned int tmp = ccs_update_ee_counter(-1); | |
95 | + if (is_current) | |
96 | + printk(KERN_INFO "AKARI: Releasing %p by pid=%u (count=%u)\n", | |
97 | + ee, current->pid, tmp); | |
98 | + else | |
99 | + printk(KERN_INFO "AKARI: Releasing %p by kernel (count=%u)\n", | |
100 | + ee, tmp); | |
101 | +} | |
102 | + | |
103 | +#endif | |
104 | + | |
105 | +#if !defined(CONFIG_AKARI_DEBUG) | |
106 | +#define ccs_debug_trace(pos) do { } while (0) | |
107 | +#else | |
108 | +#define ccs_debug_trace(pos) \ | |
109 | + do { \ | |
110 | + static bool done; \ | |
111 | + if (!done) { \ | |
112 | + printk(KERN_INFO \ | |
113 | + "AKARI: Debug trace: " pos " of 4\n"); \ | |
114 | + done = true; \ | |
115 | + } \ | |
116 | + } while (0) | |
117 | +#endif | |
118 | + | |
119 | +/** | |
120 | + * ccs_clear_execve - Release memory used by do_execve(). | |
121 | + * | |
122 | + * @ret: 0 if do_execve() succeeded, negative value otherwise. | |
123 | + * @security: Pointer to "struct ccs_security". | |
124 | + * | |
125 | + * Returns nothing. | |
126 | + */ | |
127 | +static void ccs_clear_execve(int ret, struct ccs_security *security) | |
128 | +{ | |
129 | + struct ccs_execve *ee; | |
130 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
131 | + return; | |
132 | + ee = security->ee; | |
133 | + security->ee = NULL; | |
134 | + if (!ee) | |
135 | + return; | |
136 | + ccs_finish_execve(ret, ee); | |
137 | +} | |
138 | + | |
139 | +/** | |
140 | + * ccs_task_alloc_security - Allocate memory for new tasks. | |
141 | + * | |
142 | + * @p: Pointer to "struct task_struct". | |
143 | + * | |
144 | + * Returns 0 on success, negative value otherwise. | |
145 | + */ | |
146 | +static int ccs_task_alloc_security(struct task_struct *p) | |
147 | +{ | |
148 | + int rc = __ccs_alloc_task_security(p); | |
149 | + if (rc) | |
150 | + return rc; | |
151 | + while (!original_security_ops.task_alloc_security) | |
152 | + smp_rmb(); | |
153 | + rc = original_security_ops.task_alloc_security(p); | |
154 | + if (rc) | |
155 | + __ccs_free_task_security(p); | |
156 | + return rc; | |
157 | +} | |
158 | + | |
159 | +/** | |
160 | + * ccs_task_free_security - Release memory for "struct task_struct". | |
161 | + * | |
162 | + * @p: Pointer to "struct task_struct". | |
163 | + * | |
164 | + * Returns nothing. | |
165 | + */ | |
166 | +static void ccs_task_free_security(struct task_struct *p) | |
167 | +{ | |
168 | + while (!original_security_ops.task_free_security) | |
169 | + smp_rmb(); | |
170 | + original_security_ops.task_free_security(p); | |
171 | + __ccs_free_task_security(p); | |
172 | +} | |
173 | + | |
174 | +/** | |
175 | + * ccs_bprm_alloc_security - Allocate memory for "struct linux_binprm". | |
176 | + * | |
177 | + * @bprm: Pointer to "struct linux_binprm". | |
178 | + * | |
179 | + * Returns 0 on success, negative value otherwise. | |
180 | + */ | |
181 | +static int ccs_bprm_alloc_security(struct linux_binprm *bprm) | |
182 | +{ | |
183 | + int rc; | |
184 | + while (!original_security_ops.bprm_alloc_security) | |
185 | + smp_rmb(); | |
186 | + rc = original_security_ops.bprm_alloc_security(bprm); | |
187 | + if (bprm->security || rc) | |
188 | + return rc; | |
189 | + /* | |
190 | + * Update bprm->security to &ccs_bprm_security so that | |
191 | + * security_bprm_free() is called even if do_execve() failed at | |
192 | + * search_binary_handler() without allocating memory at | |
193 | + * security_bprm_alloc(). This trick assumes that active LSM module | |
194 | + * does not access bprm->security if that module did not allocate | |
195 | + * memory at security_bprm_alloc(). | |
196 | + */ | |
197 | + bprm->security = (void *) &ccs_bprm_security; | |
198 | + return 0; | |
199 | +} | |
200 | + | |
201 | +/** | |
202 | + * ccs_bprm_free_security - Release memory for "struct linux_binprm". | |
203 | + * | |
204 | + * @bprm: Pointer to "struct linux_binprm". | |
205 | + * | |
206 | + * Returns nothing. | |
207 | + */ | |
208 | +static void ccs_bprm_free_security(struct linux_binprm *bprm) | |
209 | +{ | |
210 | + /* | |
211 | + * If do_execve() succeeded, bprm->security will be updated to NULL at | |
212 | + * security_bprm_compute_creds()/security_bprm_apply_creds() if | |
213 | + * bprm->security was set to &ccs_bprm_security at | |
214 | + * security_bprm_alloc(). | |
215 | + * | |
216 | + * If do_execve() failed, bprm->security remains at &ccs_bprm_security | |
217 | + * if bprm->security was set to &ccs_bprm_security at | |
218 | + * security_bprm_alloc(). | |
219 | + * | |
220 | + * And do_execve() does not call security_bprm_free() if do_execve() | |
221 | + * failed and bprm->security == NULL. Therefore, do not call | |
222 | + * original_security_ops.bprm_free_security() if bprm->security remains | |
223 | + * at &ccs_bprm_security . | |
224 | + */ | |
225 | + if (bprm->security != &ccs_bprm_security) { | |
226 | + while (!original_security_ops.bprm_free_security) | |
227 | + smp_rmb(); | |
228 | + original_security_ops.bprm_free_security(bprm); | |
229 | + } | |
230 | + /* | |
231 | + * If do_execve() succeeded, | |
232 | + * ccs_clear_execve(0, ccs_current_security()); | |
233 | + * is called before calling below one. | |
234 | + * Thus, below call becomes no-op if do_execve() succeeded. | |
235 | + */ | |
236 | + ccs_clear_execve(-1, ccs_current_security()); | |
237 | +} | |
238 | + | |
239 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 6) | |
240 | + | |
241 | +/** | |
242 | + * ccs_bprm_compute_creds - A hook which is called when do_execve() succeeded. | |
243 | + * | |
244 | + * @bprm: Pointer to "struct linux_binprm". | |
245 | + * | |
246 | + * Returns nothing. | |
247 | + */ | |
248 | +static void ccs_bprm_compute_creds(struct linux_binprm *bprm) | |
249 | +{ | |
250 | + if (bprm->security == &ccs_bprm_security) | |
251 | + bprm->security = NULL; | |
252 | + while (!original_security_ops.bprm_compute_creds) | |
253 | + smp_rmb(); | |
254 | + original_security_ops.bprm_compute_creds(bprm); | |
255 | + ccs_clear_execve(0, ccs_current_security()); | |
256 | +} | |
257 | + | |
258 | +#else | |
259 | + | |
260 | +/** | |
261 | + * ccs_bprm_apply_creds - A hook which is called when do_execve() succeeded. | |
262 | + * | |
263 | + * @bprm: Pointer to "struct linux_binprm". | |
264 | + * @unsafe: Unsafe flag. | |
265 | + * | |
266 | + * Returns nothing. | |
267 | + */ | |
268 | +static void ccs_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) | |
269 | +{ | |
270 | + if (bprm->security == &ccs_bprm_security) | |
271 | + bprm->security = NULL; | |
272 | + while (!original_security_ops.bprm_apply_creds) | |
273 | + smp_rmb(); | |
274 | + original_security_ops.bprm_apply_creds(bprm, unsafe); | |
275 | + ccs_clear_execve(0, ccs_current_security()); | |
276 | +} | |
277 | + | |
278 | +#endif | |
279 | + | |
280 | +/** | |
281 | + * ccs_bprm_check_security - Check permission for execve(). | |
282 | + * | |
283 | + * @bprm: Pointer to "struct linux_binprm". | |
284 | + * | |
285 | + * Returns 0 on success, negative value otherwise. | |
286 | + */ | |
287 | +static int ccs_bprm_check_security(struct linux_binprm *bprm) | |
288 | +{ | |
289 | + struct ccs_security *security = ccs_current_security(); | |
290 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
291 | + return -ENOMEM; | |
292 | + if (!security->ee) { | |
293 | + int rc; | |
294 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
295 | + if (!ccs_policy_loaded) | |
296 | + ccs_load_policy(bprm->filename); | |
297 | +#endif | |
298 | + rc = ccs_start_execve(bprm, &security->ee); | |
299 | + if (rc) | |
300 | + return rc; | |
301 | + } | |
302 | + while (!original_security_ops.bprm_check_security) | |
303 | + smp_rmb(); | |
304 | + return original_security_ops.bprm_check_security(bprm); | |
305 | +} | |
306 | + | |
307 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
308 | + | |
309 | +/** | |
310 | + * ccs_open - Check permission for open(). | |
311 | + * | |
312 | + * @f: Pointer to "struct file". | |
313 | + * | |
314 | + * Returns 0 on success, negative value otherwise. | |
315 | + */ | |
316 | +static int ccs_open(struct file *f) | |
317 | +{ | |
318 | + return ccs_open_permission(f->f_path.dentry, f->f_path.mnt, | |
319 | + f->f_flags + 1); | |
320 | +} | |
321 | + | |
322 | +#endif | |
323 | + | |
324 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
325 | + | |
326 | +/** | |
327 | + * ccs_dentry_open - Check permission for open(). | |
328 | + * | |
329 | + * @f: Pointer to "struct file". | |
330 | + * | |
331 | + * Returns 0 on success, negative value otherwise. | |
332 | + */ | |
333 | +static int ccs_dentry_open(struct file *f) | |
334 | +{ | |
335 | + int rc = ccs_open(f); | |
336 | + if (rc) | |
337 | + return rc; | |
338 | + while (!original_security_ops.dentry_open) | |
339 | + smp_rmb(); | |
340 | + return original_security_ops.dentry_open(f); | |
341 | +} | |
342 | + | |
343 | +#else | |
344 | + | |
345 | +/** | |
346 | + * ccs_open - Check permission for open(). | |
347 | + * | |
348 | + * @inode: Pointer to "struct inode". | |
349 | + * @mask: Open mode. | |
350 | + * @nd: Pointer to "struct nameidata". | |
351 | + * | |
352 | + * Returns 0 on success, negative value otherwise. | |
353 | + */ | |
354 | +static int ccs_open(struct inode *inode, int mask, struct nameidata *nd) | |
355 | +{ | |
356 | + int flags; | |
357 | + if (!nd || !nd->dentry) | |
358 | + return 0; | |
359 | + /* open_exec() passes MAY_EXEC . */ | |
360 | + if (mask == MAY_EXEC && inode && S_ISREG(inode->i_mode) && | |
361 | + (ccs_current_flags() & CCS_TASK_IS_IN_EXECVE)) | |
362 | + mask = MAY_READ; | |
363 | + /* | |
364 | + * This flags value is passed to ACC_MODE(). | |
365 | + * ccs_open_permission() for older versions uses old ACC_MODE(). | |
366 | + */ | |
367 | + switch (mask & (MAY_READ | MAY_WRITE)) { | |
368 | + case MAY_READ: | |
369 | + flags = 01; | |
370 | + break; | |
371 | + case MAY_WRITE: | |
372 | + flags = 02; | |
373 | + break; | |
374 | + case MAY_READ | MAY_WRITE: | |
375 | + flags = 03; | |
376 | + break; | |
377 | + default: | |
378 | + return 0; | |
379 | + } | |
380 | + return ccs_open_permission(nd->dentry, nd->mnt, flags); | |
381 | +} | |
382 | + | |
383 | +/** | |
384 | + * ccs_inode_permission - Check permission for open(). | |
385 | + * | |
386 | + * @inode: Pointer to "struct inode". | |
387 | + * @mask: Open mode. | |
388 | + * @nd: Pointer to "struct nameidata". | |
389 | + * | |
390 | + * Returns 0 on success, negative value otherwise. | |
391 | + * | |
392 | + * Note that this hook is called from permission(), and may not be called for | |
393 | + * open(). Maybe it is better to use security_file_permission(). | |
394 | + */ | |
395 | +static int ccs_inode_permission(struct inode *inode, int mask, | |
396 | + struct nameidata *nd) | |
397 | +{ | |
398 | + int rc = ccs_open(inode, mask, nd); | |
399 | + if (rc) | |
400 | + return rc; | |
401 | + while (!original_security_ops.inode_permission) | |
402 | + smp_rmb(); | |
403 | + return original_security_ops.inode_permission(inode, mask, nd); | |
404 | +} | |
405 | + | |
406 | +#endif | |
407 | + | |
408 | +/** | |
409 | + * ccs_inode_setattr - Check permission for chown()/chgrp()/chmod()/truncate(). | |
410 | + * | |
411 | + * @dentry: Pointer to "struct dentry". | |
412 | + * @attr: Pointer to "struct iattr". | |
413 | + * | |
414 | + * Returns 0 on success, negative value otherwise. | |
415 | + */ | |
416 | +static int ccs_inode_setattr(struct dentry *dentry, struct iattr *attr) | |
417 | +{ | |
418 | + int rc = 0; | |
419 | + if (attr->ia_valid & ATTR_UID) | |
420 | + rc = ccs_chown_permission(dentry, NULL, attr->ia_uid, -1); | |
421 | + if (!rc && (attr->ia_valid & ATTR_GID)) | |
422 | + rc = ccs_chown_permission(dentry, NULL, -1, attr->ia_gid); | |
423 | + if (!rc && (attr->ia_valid & ATTR_MODE)) | |
424 | + rc = ccs_chmod_permission(dentry, NULL, attr->ia_mode); | |
425 | + if (!rc && (attr->ia_valid & ATTR_SIZE)) | |
426 | + rc = ccs_truncate_permission(dentry, NULL); | |
427 | + if (rc) | |
428 | + return rc; | |
429 | + while (!original_security_ops.inode_setattr) | |
430 | + smp_rmb(); | |
431 | + return original_security_ops.inode_setattr(dentry, attr); | |
432 | +} | |
433 | + | |
434 | +/** | |
435 | + * ccs_inode_getattr - Check permission for stat(). | |
436 | + * | |
437 | + * @mnt: Pointer to "struct vfsmount". | |
438 | + * @dentry: Pointer to "struct dentry". | |
439 | + * | |
440 | + * Returns 0 on success, negative value otherwise. | |
441 | + */ | |
442 | +static int ccs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
443 | +{ | |
444 | + int rc = ccs_getattr_permission(mnt, dentry); | |
445 | + if (rc) | |
446 | + return rc; | |
447 | + while (!original_security_ops.inode_getattr) | |
448 | + smp_rmb(); | |
449 | + return original_security_ops.inode_getattr(mnt, dentry); | |
450 | +} | |
451 | + | |
452 | +/** | |
453 | + * ccs_inode_mknod - Check permission for mknod(). | |
454 | + * | |
455 | + * @dir: Pointer to "struct inode". | |
456 | + * @dentry: Pointer to "struct dentry". | |
457 | + * @mode: Create mode. | |
458 | + * @dev: Device major/minor number. | |
459 | + * | |
460 | + * Returns 0 on success, negative value otherwise. | |
461 | + */ | |
462 | +static int ccs_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, | |
463 | + dev_t dev) | |
464 | +{ | |
465 | + int rc = ccs_mknod_permission(dentry, NULL, mode, dev); | |
466 | + if (rc) | |
467 | + return rc; | |
468 | + while (!original_security_ops.inode_mknod) | |
469 | + smp_rmb(); | |
470 | + return original_security_ops.inode_mknod(dir, dentry, mode, dev); | |
471 | +} | |
472 | + | |
473 | +/** | |
474 | + * ccs_inode_mkdir - Check permission for mkdir(). | |
475 | + * | |
476 | + * @dir: Pointer to "struct inode". | |
477 | + * @dentry: Pointer to "struct dentry". | |
478 | + * @mode: Create mode. | |
479 | + * | |
480 | + * Returns 0 on success, negative value otherwise. | |
481 | + */ | |
482 | +static int ccs_inode_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
483 | +{ | |
484 | + int rc = ccs_mkdir_permission(dentry, NULL, mode); | |
485 | + if (rc) | |
486 | + return rc; | |
487 | + while (!original_security_ops.inode_mkdir) | |
488 | + smp_rmb(); | |
489 | + return original_security_ops.inode_mkdir(dir, dentry, mode); | |
490 | +} | |
491 | + | |
492 | +/** | |
493 | + * ccs_inode_rmdir - Check permission for rmdir(). | |
494 | + * | |
495 | + * @dir: Pointer to "struct inode". | |
496 | + * @dentry: Pointer to "struct dentry". | |
497 | + * | |
498 | + * Returns 0 on success, negative value otherwise. | |
499 | + */ | |
500 | +static int ccs_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
501 | +{ | |
502 | + int rc = ccs_rmdir_permission(dentry, NULL); | |
503 | + if (rc) | |
504 | + return rc; | |
505 | + while (!original_security_ops.inode_rmdir) | |
506 | + smp_rmb(); | |
507 | + return original_security_ops.inode_rmdir(dir, dentry); | |
508 | +} | |
509 | + | |
510 | +/** | |
511 | + * ccs_inode_unlink - Check permission for unlink(). | |
512 | + * | |
513 | + * @dir: Pointer to "struct inode". | |
514 | + * @dentry: Pointer to "struct dentry". | |
515 | + * | |
516 | + * Returns 0 on success, negative value otherwise. | |
517 | + */ | |
518 | +static int ccs_inode_unlink(struct inode *dir, struct dentry *dentry) | |
519 | +{ | |
520 | + int rc = ccs_unlink_permission(dentry, NULL); | |
521 | + if (rc) | |
522 | + return rc; | |
523 | + while (!original_security_ops.inode_unlink) | |
524 | + smp_rmb(); | |
525 | + return original_security_ops.inode_unlink(dir, dentry); | |
526 | +} | |
527 | + | |
528 | +/** | |
529 | + * ccs_inode_symlink - Check permission for symlink(). | |
530 | + * | |
531 | + * @dir: Pointer to "struct inode". | |
532 | + * @dentry: Pointer to "struct dentry". | |
533 | + * @old_name: Content of symbolic link. | |
534 | + * | |
535 | + * Returns 0 on success, negative value otherwise. | |
536 | + */ | |
537 | +static int ccs_inode_symlink(struct inode *dir, struct dentry *dentry, | |
538 | + const char *old_name) | |
539 | +{ | |
540 | + int rc = ccs_symlink_permission(dentry, NULL, old_name); | |
541 | + if (rc) | |
542 | + return rc; | |
543 | + while (!original_security_ops.inode_symlink) | |
544 | + smp_rmb(); | |
545 | + return original_security_ops.inode_symlink(dir, dentry, old_name); | |
546 | +} | |
547 | + | |
548 | +/** | |
549 | + * ccs_inode_rename - Check permission for rename(). | |
550 | + * | |
551 | + * @old_dir: Pointer to "struct inode". | |
552 | + * @old_dentry: Pointer to "struct dentry". | |
553 | + * @new_dir: Pointer to "struct inode". | |
554 | + * @new_dentry: Pointer to "struct dentry". | |
555 | + * | |
556 | + * Returns 0 on success, negative value otherwise. | |
557 | + */ | |
558 | +static int ccs_inode_rename(struct inode *old_dir, struct dentry *old_dentry, | |
559 | + struct inode *new_dir, struct dentry *new_dentry) | |
560 | +{ | |
561 | + int rc = ccs_rename_permission(old_dentry, new_dentry, NULL); | |
562 | + if (rc) | |
563 | + return rc; | |
564 | + while (!original_security_ops.inode_rename) | |
565 | + smp_rmb(); | |
566 | + return original_security_ops.inode_rename(old_dir, old_dentry, new_dir, | |
567 | + new_dentry); | |
568 | +} | |
569 | + | |
570 | +/** | |
571 | + * ccs_inode_link - Check permission for link(). | |
572 | + * | |
573 | + * @old_dentry: Pointer to "struct dentry". | |
574 | + * @dir: Pointer to "struct inode". | |
575 | + * @new_dentry: Pointer to "struct dentry". | |
576 | + * | |
577 | + * Returns 0 on success, negative value otherwise. | |
578 | + */ | |
579 | +static int ccs_inode_link(struct dentry *old_dentry, struct inode *dir, | |
580 | + struct dentry *new_dentry) | |
581 | +{ | |
582 | + int rc = ccs_link_permission(old_dentry, new_dentry, NULL); | |
583 | + if (rc) | |
584 | + return rc; | |
585 | + while (!original_security_ops.inode_link) | |
586 | + smp_rmb(); | |
587 | + return original_security_ops.inode_link(old_dentry, dir, new_dentry); | |
588 | +} | |
589 | + | |
590 | +/** | |
591 | + * ccs_inode_create - Check permission for creat(). | |
592 | + * | |
593 | + * @dir: Pointer to "struct inode". | |
594 | + * @dentry: Pointer to "struct dentry". | |
595 | + * @mode: Create mode. | |
596 | + * | |
597 | + * Returns 0 on success, negative value otherwise. | |
598 | + */ | |
599 | +static int ccs_inode_create(struct inode *dir, struct dentry *dentry, | |
600 | + int mode) | |
601 | +{ | |
602 | + int rc = ccs_mknod_permission(dentry, NULL, mode, 0); | |
603 | + if (rc) | |
604 | + return rc; | |
605 | + while (!original_security_ops.inode_create) | |
606 | + smp_rmb(); | |
607 | + return original_security_ops.inode_create(dir, dentry, mode); | |
608 | +} | |
609 | + | |
610 | +#ifdef CONFIG_SECURITY_NETWORK | |
611 | + | |
612 | +#include <net/sock.h> | |
613 | + | |
614 | +/* Structure for remembering an accept()ed socket's status. */ | |
615 | +struct ccs_socket_tag { | |
616 | + struct list_head list; | |
617 | + struct inode *inode; | |
618 | + int status; | |
619 | + struct rcu_head rcu; | |
620 | +}; | |
621 | + | |
622 | +/* | |
623 | + * List for managing accept()ed sockets. | |
624 | + * Since we don't need to keep an accept()ed socket into this list after | |
625 | + * once the permission was granted, the number of entries in this list is | |
626 | + * likely small. Therefore, we don't use hash tables. | |
627 | + */ | |
628 | +static LIST_HEAD(ccs_accepted_socket_list); | |
629 | +/* Lock for protecting ccs_accepted_socket_list . */ | |
630 | +static DEFINE_SPINLOCK(ccs_accepted_socket_list_lock); | |
631 | + | |
632 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
633 | + | |
634 | +/** | |
635 | + * ccs_socket_rcu_free - RCU callback for releasing "struct ccs_socket_tag". | |
636 | + * | |
637 | + * @rcu: Pointer to "struct rcu_head". | |
638 | + * | |
639 | + * Returns nothing. | |
640 | + */ | |
641 | +static void ccs_socket_rcu_free(struct rcu_head *rcu) | |
642 | +{ | |
643 | + struct ccs_socket_tag *ptr = container_of(rcu, typeof(*ptr), rcu); | |
644 | + kfree(ptr); | |
645 | +} | |
646 | + | |
647 | +#else | |
648 | + | |
649 | +/** | |
650 | + * ccs_socket_rcu_free - RCU callback for releasing "struct ccs_socket_tag". | |
651 | + * | |
652 | + * @arg: Pointer to "void". | |
653 | + * | |
654 | + * Returns nothing. | |
655 | + */ | |
656 | +static void ccs_socket_rcu_free(void *arg) | |
657 | +{ | |
658 | + struct ccs_socket_tag *ptr = arg; | |
659 | + kfree(ptr); | |
660 | +} | |
661 | + | |
662 | +#endif | |
663 | + | |
664 | +/** | |
665 | + * ccs_update_socket_tag - Update tag associated with accept()ed sockets. | |
666 | + * | |
667 | + * @inode: Pointer to "struct inode". | |
668 | + * @status: New status. | |
669 | + * | |
670 | + * Returns nothing. | |
671 | + * | |
672 | + * If @status == 0, memory for that socket will be released after RCU grace | |
673 | + * period. | |
674 | + */ | |
675 | +static void ccs_update_socket_tag(struct inode *inode, int status) | |
676 | +{ | |
677 | + struct ccs_socket_tag *ptr; | |
678 | + /* | |
679 | + * Protect whole section because multiple threads may call this | |
680 | + * function with same "sock" via ccs_validate_socket(). | |
681 | + */ | |
682 | + spin_lock(&ccs_accepted_socket_list_lock); | |
683 | + rcu_read_lock(); | |
684 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
685 | + if (ptr->inode != inode) | |
686 | + continue; | |
687 | + ptr->status = status; | |
688 | + if (status) | |
689 | + break; | |
690 | + list_del_rcu(&ptr->list); | |
691 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
692 | + call_rcu(&ptr->rcu, ccs_socket_rcu_free); | |
693 | +#else | |
694 | + call_rcu(&ptr->rcu, ccs_socket_rcu_free, ptr); | |
695 | +#endif | |
696 | + break; | |
697 | + } | |
698 | + rcu_read_unlock(); | |
699 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
700 | +} | |
701 | + | |
702 | +/** | |
703 | + * ccs_validate_socket - Check post accept() permission if needed. | |
704 | + * | |
705 | + * @sock: Pointer to "struct socket". | |
706 | + * | |
707 | + * Returns 0 on success, negative value otherwise. | |
708 | + */ | |
709 | +static int ccs_validate_socket(struct socket *sock) | |
710 | +{ | |
711 | + struct inode *inode = SOCK_INODE(sock); | |
712 | + struct ccs_socket_tag *ptr; | |
713 | + int ret = 0; | |
714 | + rcu_read_lock(); | |
715 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
716 | + if (ptr->inode != inode) | |
717 | + continue; | |
718 | + ret = ptr->status; | |
719 | + break; | |
720 | + } | |
721 | + rcu_read_unlock(); | |
722 | + if (ret <= 0) | |
723 | + /* | |
724 | + * This socket is not an accept()ed socket or this socket is | |
725 | + * an accept()ed socket and post accept() permission is done. | |
726 | + */ | |
727 | + return ret; | |
728 | + /* | |
729 | + * Check post accept() permission now. | |
730 | + * | |
731 | + * Strictly speaking, we need to pass both listen()ing socket and | |
732 | + * accept()ed socket to __ccs_socket_post_accept_permission(). | |
733 | + * But since socket's family and type are same for both sockets, | |
734 | + * passing the accept()ed socket in place for the listen()ing socket | |
735 | + * will work. | |
736 | + */ | |
737 | + ret = ccs_socket_post_accept_permission(sock, sock); | |
738 | + /* | |
739 | + * If permission was granted, we forget that this is an accept()ed | |
740 | + * socket. Otherwise, we remember that this socket needs to return | |
741 | + * error for subsequent socketcalls. | |
742 | + */ | |
743 | + ccs_update_socket_tag(inode, ret); | |
744 | + return ret; | |
745 | +} | |
746 | + | |
747 | +/** | |
748 | + * ccs_socket_accept - Check permission for accept(). | |
749 | + * | |
750 | + * @sock: Pointer to "struct socket". | |
751 | + * @newsock: Pointer to "struct socket". | |
752 | + * | |
753 | + * Returns 0 on success, negative value otherwise. | |
754 | + * | |
755 | + * This hook is used for setting up environment for doing post accept() | |
756 | + * permission check. If dereferencing sock->ops->something() were ordered by | |
757 | + * rcu_dereference(), we could replace sock->ops with "a copy of original | |
758 | + * sock->ops with modified sock->ops->accept()" using rcu_assign_pointer() | |
759 | + * in order to do post accept() permission check before returning to userspace. | |
760 | + * If we make the copy in security_socket_post_create(), it would be possible | |
761 | + * to safely replace sock->ops here, but we don't do so because we don't want | |
762 | + * to allocate memory for sockets which do not call sock->ops->accept(). | |
763 | + * Therefore, we do post accept() permission check upon next socket syscalls | |
764 | + * rather than between sock->ops->accept() and returning to userspace. | |
765 | + * This means that if a socket was close()d before calling some socket | |
766 | + * syscalls, post accept() permission check will not be done. | |
767 | + */ | |
768 | +static int ccs_socket_accept(struct socket *sock, struct socket *newsock) | |
769 | +{ | |
770 | + struct ccs_socket_tag *ptr; | |
771 | + int rc = ccs_validate_socket(sock); | |
772 | + if (rc < 0) | |
773 | + return rc; | |
774 | + ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); | |
775 | + if (!ptr) | |
776 | + return -ENOMEM; | |
777 | + while (!original_security_ops.socket_accept) | |
778 | + smp_rmb(); | |
779 | + rc = original_security_ops.socket_accept(sock, newsock); | |
780 | + if (rc) { | |
781 | + kfree(ptr); | |
782 | + return rc; | |
783 | + } | |
784 | + /* | |
785 | + * Subsequent LSM hooks will receive "newsock". Therefore, I mark | |
786 | + * "newsock" as "an accept()ed socket but post accept() permission | |
787 | + * check is not done yet" by allocating memory using inode of the | |
788 | + * "newsock" as a search key. | |
789 | + */ | |
790 | + ptr->inode = SOCK_INODE(newsock); | |
791 | + ptr->status = 1; /* Check post accept() permission later. */ | |
792 | + spin_lock(&ccs_accepted_socket_list_lock); | |
793 | + list_add_tail_rcu(&ptr->list, &ccs_accepted_socket_list); | |
794 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
795 | + return 0; | |
796 | +} | |
797 | + | |
798 | +/** | |
799 | + * ccs_socket_listen - Check permission for listen(). | |
800 | + * | |
801 | + * @sock: Pointer to "struct socket". | |
802 | + * @backlog: Backlog parameter. | |
803 | + * | |
804 | + * Returns 0 on success, negative value otherwise. | |
805 | + */ | |
806 | +static int ccs_socket_listen(struct socket *sock, int backlog) | |
807 | +{ | |
808 | + int rc = ccs_validate_socket(sock); | |
809 | + if (rc < 0) | |
810 | + return rc; | |
811 | + rc = ccs_socket_listen_permission(sock); | |
812 | + if (rc) | |
813 | + return rc; | |
814 | + while (!original_security_ops.socket_listen) | |
815 | + smp_rmb(); | |
816 | + return original_security_ops.socket_listen(sock, backlog); | |
817 | +} | |
818 | + | |
819 | +/** | |
820 | + * ccs_socket_connect - Check permission for connect(). | |
821 | + * | |
822 | + * @sock: Pointer to "struct socket". | |
823 | + * @addr: Pointer to "struct sockaddr". | |
824 | + * @addr_len: Size of @addr. | |
825 | + * | |
826 | + * Returns 0 on success, negative value otherwise. | |
827 | + */ | |
828 | +static int ccs_socket_connect(struct socket *sock, struct sockaddr *addr, | |
829 | + int addr_len) | |
830 | +{ | |
831 | + int rc = ccs_validate_socket(sock); | |
832 | + if (rc < 0) | |
833 | + return rc; | |
834 | + rc = ccs_socket_connect_permission(sock, addr, addr_len); | |
835 | + if (rc) | |
836 | + return rc; | |
837 | + while (!original_security_ops.socket_connect) | |
838 | + smp_rmb(); | |
839 | + return original_security_ops.socket_connect(sock, addr, addr_len); | |
840 | +} | |
841 | + | |
842 | +/** | |
843 | + * ccs_socket_bind - Check permission for bind(). | |
844 | + * | |
845 | + * @sock: Pointer to "struct socket". | |
846 | + * @addr: Pointer to "struct sockaddr". | |
847 | + * @addr_len: Size of @addr. | |
848 | + * | |
849 | + * Returns 0 on success, negative value otherwise. | |
850 | + */ | |
851 | +static int ccs_socket_bind(struct socket *sock, struct sockaddr *addr, | |
852 | + int addr_len) | |
853 | +{ | |
854 | + int rc = ccs_validate_socket(sock); | |
855 | + if (rc < 0) | |
856 | + return rc; | |
857 | + rc = ccs_socket_bind_permission(sock, addr, addr_len); | |
858 | + if (rc) | |
859 | + return rc; | |
860 | + while (!original_security_ops.socket_bind) | |
861 | + smp_rmb(); | |
862 | + return original_security_ops.socket_bind(sock, addr, addr_len); | |
863 | +} | |
864 | + | |
865 | +/** | |
866 | + * ccs_socket_sendmsg - Check permission for sendmsg(). | |
867 | + * | |
868 | + * @sock: Pointer to "struct socket". | |
869 | + * @msg: Pointer to "struct msghdr". | |
870 | + * @size: Size of message. | |
871 | + * | |
872 | + * Returns 0 on success, negative value otherwise. | |
873 | + */ | |
874 | +static int ccs_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
875 | + int size) | |
876 | +{ | |
877 | + int rc = ccs_validate_socket(sock); | |
878 | + if (rc < 0) | |
879 | + return rc; | |
880 | + rc = ccs_socket_sendmsg_permission(sock, msg, size); | |
881 | + if (rc) | |
882 | + return rc; | |
883 | + while (!original_security_ops.socket_sendmsg) | |
884 | + smp_rmb(); | |
885 | + return original_security_ops.socket_sendmsg(sock, msg, size); | |
886 | +} | |
887 | + | |
888 | +/** | |
889 | + * ccs_socket_recvmsg - Check permission for recvmsg(). | |
890 | + * | |
891 | + * @sock: Pointer to "struct socket". | |
892 | + * @msg: Pointer to "struct msghdr". | |
893 | + * @size: Size of message. | |
894 | + * @flags: Flags. | |
895 | + * | |
896 | + * Returns 0 on success, negative value otherwise. | |
897 | + */ | |
898 | +static int ccs_socket_recvmsg(struct socket *sock, struct msghdr *msg, | |
899 | + int size, int flags) | |
900 | +{ | |
901 | + int rc = ccs_validate_socket(sock); | |
902 | + if (rc < 0) | |
903 | + return rc; | |
904 | + while (!original_security_ops.socket_recvmsg) | |
905 | + smp_rmb(); | |
906 | + return original_security_ops.socket_recvmsg(sock, msg, size, flags); | |
907 | +} | |
908 | + | |
909 | +/** | |
910 | + * ccs_socket_getsockname - Check permission for getsockname(). | |
911 | + * | |
912 | + * @sock: Pointer to "struct socket". | |
913 | + * | |
914 | + * Returns 0 on success, negative value otherwise. | |
915 | + */ | |
916 | +static int ccs_socket_getsockname(struct socket *sock) | |
917 | +{ | |
918 | + int rc = ccs_validate_socket(sock); | |
919 | + if (rc < 0) | |
920 | + return rc; | |
921 | + while (!original_security_ops.socket_getsockname) | |
922 | + smp_rmb(); | |
923 | + return original_security_ops.socket_getsockname(sock); | |
924 | +} | |
925 | + | |
926 | +/** | |
927 | + * ccs_socket_getpeername - Check permission for getpeername(). | |
928 | + * | |
929 | + * @sock: Pointer to "struct socket". | |
930 | + * | |
931 | + * Returns 0 on success, negative value otherwise. | |
932 | + */ | |
933 | +static int ccs_socket_getpeername(struct socket *sock) | |
934 | +{ | |
935 | + int rc = ccs_validate_socket(sock); | |
936 | + if (rc < 0) | |
937 | + return rc; | |
938 | + while (!original_security_ops.socket_getpeername) | |
939 | + smp_rmb(); | |
940 | + return original_security_ops.socket_getpeername(sock); | |
941 | +} | |
942 | + | |
943 | +/** | |
944 | + * ccs_socket_getsockopt - Check permission for getsockopt(). | |
945 | + * | |
946 | + * @sock: Pointer to "struct socket". | |
947 | + * @level: Level. | |
948 | + * @optname: Option's name, | |
949 | + * | |
950 | + * Returns 0 on success, negative value otherwise. | |
951 | + */ | |
952 | +static int ccs_socket_getsockopt(struct socket *sock, int level, int optname) | |
953 | +{ | |
954 | + int rc = ccs_validate_socket(sock); | |
955 | + if (rc < 0) | |
956 | + return rc; | |
957 | + while (!original_security_ops.socket_getsockopt) | |
958 | + smp_rmb(); | |
959 | + return original_security_ops.socket_getsockopt(sock, level, optname); | |
960 | +} | |
961 | + | |
962 | +/** | |
963 | + * ccs_socket_setsockopt - Check permission for setsockopt(). | |
964 | + * | |
965 | + * @sock: Pointer to "struct socket". | |
966 | + * @level: Level. | |
967 | + * @optname: Option's name, | |
968 | + * | |
969 | + * Returns 0 on success, negative value otherwise. | |
970 | + */ | |
971 | +static int ccs_socket_setsockopt(struct socket *sock, int level, int optname) | |
972 | +{ | |
973 | + int rc = ccs_validate_socket(sock); | |
974 | + if (rc < 0) | |
975 | + return rc; | |
976 | + while (!original_security_ops.socket_setsockopt) | |
977 | + smp_rmb(); | |
978 | + return original_security_ops.socket_setsockopt(sock, level, optname); | |
979 | +} | |
980 | + | |
981 | +/** | |
982 | + * ccs_socket_shutdown - Check permission for shutdown(). | |
983 | + * | |
984 | + * @sock: Pointer to "struct socket". | |
985 | + * @how: Shutdown mode. | |
986 | + * | |
987 | + * Returns 0 on success, negative value otherwise. | |
988 | + */ | |
989 | +static int ccs_socket_shutdown(struct socket *sock, int how) | |
990 | +{ | |
991 | + int rc = ccs_validate_socket(sock); | |
992 | + if (rc < 0) | |
993 | + return rc; | |
994 | + while (!original_security_ops.socket_shutdown) | |
995 | + smp_rmb(); | |
996 | + return original_security_ops.socket_shutdown(sock, how); | |
997 | +} | |
998 | + | |
999 | +#define SOCKFS_MAGIC 0x534F434B | |
1000 | + | |
1001 | +/** | |
1002 | + * ccs_inode_free_security - Release memory associated with an inode. | |
1003 | + * | |
1004 | + * @inode: Pointer to "struct inode". | |
1005 | + * | |
1006 | + * Returns nothing. | |
1007 | + * | |
1008 | + * We use this hook for releasing memory associated with an accept()ed socket. | |
1009 | + */ | |
1010 | +static void ccs_inode_free_security(struct inode *inode) | |
1011 | +{ | |
1012 | + while (!original_security_ops.inode_free_security) | |
1013 | + smp_rmb(); | |
1014 | + original_security_ops.inode_free_security(inode); | |
1015 | + if (inode->i_sb && inode->i_sb->s_magic == SOCKFS_MAGIC) | |
1016 | + ccs_update_socket_tag(inode, 0); | |
1017 | +} | |
1018 | + | |
1019 | +#endif | |
1020 | + | |
1021 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) | |
1022 | + | |
1023 | +/** | |
1024 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
1025 | + * | |
1026 | + * @old_nd: Pointer to "struct nameidata". | |
1027 | + * @new_nd: Pointer to "struct nameidata". | |
1028 | + * | |
1029 | + * Returns 0 on success, negative value otherwise. | |
1030 | + */ | |
1031 | +static int ccs_sb_pivotroot(struct nameidata *old_nd, struct nameidata *new_nd) | |
1032 | +{ | |
1033 | + int rc = ccs_pivot_root_permission(old_nd, new_nd); | |
1034 | + if (rc) | |
1035 | + return rc; | |
1036 | + while (!original_security_ops.sb_pivotroot) | |
1037 | + smp_rmb(); | |
1038 | + return original_security_ops.sb_pivotroot(old_nd, new_nd); | |
1039 | +} | |
1040 | + | |
1041 | +/** | |
1042 | + * ccs_sb_mount - Check permission for mount(). | |
1043 | + * | |
1044 | + * @dev_name: Name of device file. | |
1045 | + * @nd: Pointer to "struct nameidata". | |
1046 | + * @type: Name of filesystem type. Maybe NULL. | |
1047 | + * @flags: Mount options. | |
1048 | + * @data_page: Optional data. Maybe NULL. | |
1049 | + * | |
1050 | + * Returns 0 on success, negative value otherwise. | |
1051 | + */ | |
1052 | +static int ccs_sb_mount(char *dev_name, struct nameidata *nd, char *type, | |
1053 | + unsigned long flags, void *data_page) | |
1054 | +{ | |
1055 | + int rc = ccs_mount_permission(dev_name, nd, type, flags, data_page); | |
1056 | + if (rc) | |
1057 | + return rc; | |
1058 | + while (!original_security_ops.sb_mount) | |
1059 | + smp_rmb(); | |
1060 | + return original_security_ops.sb_mount(dev_name, nd, type, flags, | |
1061 | + data_page); | |
1062 | +} | |
1063 | + | |
1064 | +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26) | |
1065 | + | |
1066 | +/** | |
1067 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
1068 | + * | |
1069 | + * @old_nd: Pointer to "struct nameidata". | |
1070 | + * @new_nd: Pointer to "struct nameidata". | |
1071 | + * | |
1072 | + * Returns 0 on success, negative value otherwise. | |
1073 | + */ | |
1074 | +static int ccs_sb_pivotroot(struct nameidata *old_nd, struct nameidata *new_nd) | |
1075 | +{ | |
1076 | + int rc = ccs_pivot_root_permission(&old_nd->path, &new_nd->path); | |
1077 | + if (rc) | |
1078 | + return rc; | |
1079 | + while (!original_security_ops.sb_pivotroot) | |
1080 | + smp_rmb(); | |
1081 | + return original_security_ops.sb_pivotroot(old_nd, new_nd); | |
1082 | +} | |
1083 | + | |
1084 | +/** | |
1085 | + * ccs_sb_mount - Check permission for mount(). | |
1086 | + * | |
1087 | + * @dev_name: Name of device file. | |
1088 | + * @nd: Pointer to "struct nameidata". | |
1089 | + * @type: Name of filesystem type. Maybe NULL. | |
1090 | + * @flags: Mount options. | |
1091 | + * @data_page: Optional data. Maybe NULL. | |
1092 | + * | |
1093 | + * Returns 0 on success, negative value otherwise. | |
1094 | + */ | |
1095 | +static int ccs_sb_mount(char *dev_name, struct nameidata *nd, char *type, | |
1096 | + unsigned long flags, void *data_page) | |
1097 | +{ | |
1098 | + int rc = ccs_mount_permission(dev_name, &nd->path, type, flags, | |
1099 | + data_page); | |
1100 | + if (rc) | |
1101 | + return rc; | |
1102 | + while (!original_security_ops.sb_mount) | |
1103 | + smp_rmb(); | |
1104 | + return original_security_ops.sb_mount(dev_name, nd, type, flags, | |
1105 | + data_page); | |
1106 | +} | |
1107 | + | |
1108 | +#else | |
1109 | + | |
1110 | +/** | |
1111 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
1112 | + * | |
1113 | + * @old_path: Pointer to "struct path". | |
1114 | + * @new_path: Pointer to "struct path". | |
1115 | + * | |
1116 | + * Returns 0 on success, negative value otherwise. | |
1117 | + */ | |
1118 | +static int ccs_sb_pivotroot(struct path *old_path, struct path *new_path) | |
1119 | +{ | |
1120 | + int rc = ccs_pivot_root_permission(old_path, new_path); | |
1121 | + if (rc) | |
1122 | + return rc; | |
1123 | + while (!original_security_ops.sb_pivotroot) | |
1124 | + smp_rmb(); | |
1125 | + return original_security_ops.sb_pivotroot(old_path, new_path); | |
1126 | +} | |
1127 | + | |
1128 | +/** | |
1129 | + * ccs_sb_mount - Check permission for mount(). | |
1130 | + * | |
1131 | + * @dev_name: Name of device file. | |
1132 | + * @path: Pointer to "struct path". | |
1133 | + * @type: Name of filesystem type. Maybe NULL. | |
1134 | + * @flags: Mount options. | |
1135 | + * @data_page: Optional data. Maybe NULL. | |
1136 | + * | |
1137 | + * Returns 0 on success, negative value otherwise. | |
1138 | + */ | |
1139 | +static int ccs_sb_mount(char *dev_name, struct path *path, char *type, | |
1140 | + unsigned long flags, void *data_page) | |
1141 | +{ | |
1142 | + int rc = ccs_mount_permission(dev_name, path, type, flags, data_page); | |
1143 | + if (rc) | |
1144 | + return rc; | |
1145 | + while (!original_security_ops.sb_mount) | |
1146 | + smp_rmb(); | |
1147 | + return original_security_ops.sb_mount(dev_name, path, type, flags, | |
1148 | + data_page); | |
1149 | +} | |
1150 | + | |
1151 | +#endif | |
1152 | + | |
1153 | +/** | |
1154 | + * ccs_sb_umount - Check permission for umount(). | |
1155 | + * | |
1156 | + * @mnt: Pointer to "struct vfsmount". | |
1157 | + * @flags: Unmount flags. | |
1158 | + * | |
1159 | + * Returns 0 on success, negative value otherwise. | |
1160 | + */ | |
1161 | +static int ccs_sb_umount(struct vfsmount *mnt, int flags) | |
1162 | +{ | |
1163 | + int rc = ccs_umount_permission(mnt, flags); | |
1164 | + if (rc) | |
1165 | + return rc; | |
1166 | + while (!original_security_ops.sb_umount) | |
1167 | + smp_rmb(); | |
1168 | + return original_security_ops.sb_umount(mnt, flags); | |
1169 | +} | |
1170 | + | |
1171 | +/** | |
1172 | + * ccs_file_fcntl - Check permission for fcntl(). | |
1173 | + * | |
1174 | + * @file: Pointer to "struct file". | |
1175 | + * @cmd: Command number. | |
1176 | + * @arg: Value for @cmd. | |
1177 | + * | |
1178 | + * Returns 0 on success, negative value otherwise. | |
1179 | + */ | |
1180 | +static int ccs_file_fcntl(struct file *file, unsigned int cmd, | |
1181 | + unsigned long arg) | |
1182 | +{ | |
1183 | + int rc = ccs_fcntl_permission(file, cmd, arg); | |
1184 | + if (rc) | |
1185 | + return rc; | |
1186 | + while (!original_security_ops.file_fcntl) | |
1187 | + smp_rmb(); | |
1188 | + return original_security_ops.file_fcntl(file, cmd, arg); | |
1189 | +} | |
1190 | + | |
1191 | +/** | |
1192 | + * ccs_file_ioctl - Check permission for ioctl(). | |
1193 | + * | |
1194 | + * @filp: Pointer to "struct file". | |
1195 | + * @cmd: Command number. | |
1196 | + * @arg: Value for @cmd. | |
1197 | + * | |
1198 | + * Returns 0 on success, negative value otherwise. | |
1199 | + */ | |
1200 | +static int ccs_file_ioctl(struct file *filp, unsigned int cmd, | |
1201 | + unsigned long arg) | |
1202 | +{ | |
1203 | + int rc = ccs_ioctl_permission(filp, cmd, arg); | |
1204 | + if (rc) | |
1205 | + return rc; | |
1206 | + while (!original_security_ops.file_ioctl) | |
1207 | + smp_rmb(); | |
1208 | + return original_security_ops.file_ioctl(filp, cmd, arg); | |
1209 | +} | |
1210 | + | |
1211 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) && defined(CONFIG_SYSCTL_SYSCALL) | |
1212 | +int ccs_path_permission(struct ccs_request_info *r, u8 operation, | |
1213 | + const struct ccs_path_info *filename); | |
1214 | + | |
1215 | +/** | |
1216 | + * ccs_prepend - Copy of prepend() in fs/dcache.c. | |
1217 | + * | |
1218 | + * @buffer: Pointer to "struct char *". | |
1219 | + * @buflen: Pointer to int which holds size of @buffer. | |
1220 | + * @str: String to copy. | |
1221 | + * | |
1222 | + * Returns 0 on success, negative value otherwise. | |
1223 | + * | |
1224 | + * @buffer and @buflen are updated upon success. | |
1225 | + */ | |
1226 | +static int ccs_prepend(char **buffer, int *buflen, const char *str) | |
1227 | +{ | |
1228 | + int namelen = strlen(str); | |
1229 | + if (*buflen < namelen) | |
1230 | + return -ENOMEM; | |
1231 | + *buflen -= namelen; | |
1232 | + *buffer -= namelen; | |
1233 | + memcpy(*buffer, str, namelen); | |
1234 | + return 0; | |
1235 | +} | |
1236 | + | |
1237 | +/** | |
1238 | + * ccs_sysctl_permission - Check permission for sysctl(). | |
1239 | + * | |
1240 | + * @table: Pointer to "struct ctl_table". | |
1241 | + * @op: Operation. (MAY_READ and/or MAY_WRITE) | |
1242 | + * | |
1243 | + * Returns 0 on success, negative value otherwise. | |
1244 | + */ | |
1245 | +static int ccs_sysctl(struct ctl_table *table, int op) | |
1246 | +{ | |
1247 | + int error; | |
1248 | + struct ccs_path_info buf; | |
1249 | + struct ccs_request_info r; | |
1250 | + int buflen; | |
1251 | + char *buffer; | |
1252 | + int idx; | |
1253 | + while (!original_security_ops.sysctl) | |
1254 | + smp_rmb(); | |
1255 | + error = original_security_ops.sysctl(table, op); | |
1256 | + if (error) | |
1257 | + return error; | |
1258 | + op &= MAY_READ | MAY_WRITE; | |
1259 | + if (!op) | |
1260 | + return 0; | |
1261 | + buffer = NULL; | |
1262 | + buf.name = NULL; | |
1263 | + idx = ccs_read_lock(); | |
1264 | + if (ccs_init_request_info(&r, CCS_MAC_FILE_OPEN) | |
1265 | + == CCS_CONFIG_DISABLED) | |
1266 | + goto out; | |
1267 | + error = -ENOMEM; | |
1268 | + buflen = 4096; | |
1269 | + buffer = kmalloc(buflen, CCS_GFP_FLAGS); | |
1270 | + if (buffer) { | |
1271 | + char *end = buffer + buflen; | |
1272 | + *--end = '\0'; | |
1273 | + buflen--; | |
1274 | + while (table) { | |
1275 | + char num[32]; | |
1276 | + const char *sp = table->procname; | |
1277 | + if (!sp) { | |
1278 | + memset(num, 0, sizeof(num)); | |
1279 | + snprintf(num, sizeof(num) - 1, "=%d=", | |
1280 | + table->ctl_name); | |
1281 | + sp = num; | |
1282 | + } | |
1283 | + if (ccs_prepend(&end, &buflen, sp) || | |
1284 | + ccs_prepend(&end, &buflen, "/")) | |
1285 | + goto out; | |
1286 | + table = table->parent; | |
1287 | + } | |
1288 | + if (ccs_prepend(&end, &buflen, "proc:/sys")) | |
1289 | + goto out; | |
1290 | + buf.name = ccs_encode(end); | |
1291 | + } | |
1292 | + if (buf.name) { | |
1293 | + ccs_fill_path_info(&buf); | |
1294 | + if (op & MAY_READ) | |
1295 | + error = ccs_path_permission(&r, CCS_TYPE_READ, &buf); | |
1296 | + else | |
1297 | + error = 0; | |
1298 | + if (!error && (op & MAY_WRITE)) | |
1299 | + error = ccs_path_permission(&r, CCS_TYPE_WRITE, &buf); | |
1300 | + } | |
1301 | +out: | |
1302 | + ccs_read_unlock(idx); | |
1303 | + kfree(buf.name); | |
1304 | + kfree(buffer); | |
1305 | + return error; | |
1306 | +} | |
1307 | + | |
1308 | +#endif | |
1309 | + | |
1310 | +/* | |
1311 | + * Why not to copy all operations by "original_security_ops = *ops" ? | |
1312 | + * Because copying byte array is not atomic. Reader checks | |
1313 | + * original_security_ops.op != NULL before doing original_security_ops.op(). | |
1314 | + * Thus, modifying original_security_ops.op has to be atomic. | |
1315 | + */ | |
1316 | +#define swap_security_ops(op) \ | |
1317 | + original_security_ops.op = ops->op; smp_wmb(); ops->op = ccs_##op; | |
1318 | + | |
1319 | +/** | |
1320 | + * ccs_update_security_ops - Overwrite original "struct security_operations". | |
1321 | + * | |
1322 | + * @ops: Pointer to "struct security_operations". | |
1323 | + * | |
1324 | + * Returns nothing. | |
1325 | + */ | |
1326 | +static void __init ccs_update_security_ops(struct security_operations *ops) | |
1327 | +{ | |
1328 | + /* Security context allocator. */ | |
1329 | + swap_security_ops(task_alloc_security); | |
1330 | + swap_security_ops(task_free_security); | |
1331 | + swap_security_ops(bprm_alloc_security); | |
1332 | + swap_security_ops(bprm_free_security); | |
1333 | + /* Security context updater for successful execve(). */ | |
1334 | + swap_security_ops(bprm_check_security); | |
1335 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 6) | |
1336 | + swap_security_ops(bprm_compute_creds); | |
1337 | +#else | |
1338 | + swap_security_ops(bprm_apply_creds); | |
1339 | +#endif | |
1340 | + /* Various permission checker. */ | |
1341 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
1342 | + swap_security_ops(dentry_open); | |
1343 | +#else | |
1344 | + swap_security_ops(inode_permission); | |
1345 | +#endif | |
1346 | + swap_security_ops(file_fcntl); | |
1347 | + swap_security_ops(file_ioctl); | |
1348 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) && defined(CONFIG_SYSCTL_SYSCALL) | |
1349 | + swap_security_ops(sysctl); | |
1350 | +#endif | |
1351 | + swap_security_ops(sb_pivotroot); | |
1352 | + swap_security_ops(sb_mount); | |
1353 | + swap_security_ops(sb_umount); | |
1354 | + swap_security_ops(inode_mknod); | |
1355 | + swap_security_ops(inode_mkdir); | |
1356 | + swap_security_ops(inode_rmdir); | |
1357 | + swap_security_ops(inode_unlink); | |
1358 | + swap_security_ops(inode_symlink); | |
1359 | + swap_security_ops(inode_rename); | |
1360 | + swap_security_ops(inode_link); | |
1361 | + swap_security_ops(inode_create); | |
1362 | + swap_security_ops(inode_setattr); | |
1363 | + swap_security_ops(inode_getattr); | |
1364 | +#ifdef CONFIG_SECURITY_NETWORK | |
1365 | + swap_security_ops(socket_bind); | |
1366 | + swap_security_ops(socket_connect); | |
1367 | + swap_security_ops(socket_listen); | |
1368 | + swap_security_ops(socket_sendmsg); | |
1369 | + swap_security_ops(socket_recvmsg); | |
1370 | + swap_security_ops(socket_getsockname); | |
1371 | + swap_security_ops(socket_getpeername); | |
1372 | + swap_security_ops(socket_getsockopt); | |
1373 | + swap_security_ops(socket_setsockopt); | |
1374 | + swap_security_ops(socket_shutdown); | |
1375 | + swap_security_ops(socket_accept); | |
1376 | + swap_security_ops(inode_free_security); | |
1377 | +#endif | |
1378 | +} | |
1379 | + | |
1380 | +#undef swap_security_ops | |
1381 | + | |
1382 | +/** | |
1383 | + * ccs_init - Initialize this module. | |
1384 | + * | |
1385 | + * Returns 0 on success, negative value otherwise. | |
1386 | + */ | |
1387 | +static int __init ccs_init(void) | |
1388 | +{ | |
1389 | + struct security_operations *ops = probe_security_ops(); | |
1390 | + if (!ops) | |
1391 | + goto out; | |
1392 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) | |
1393 | + ccsecurity_exports.find_task_by_vpid = probe_find_task_by_vpid(); | |
1394 | + if (!ccsecurity_exports.find_task_by_vpid) | |
1395 | + goto out; | |
1396 | + ccsecurity_exports.find_task_by_pid_ns = probe_find_task_by_pid_ns(); | |
1397 | + if (!ccsecurity_exports.find_task_by_pid_ns) | |
1398 | + goto out; | |
1399 | +#endif | |
1400 | + ccsecurity_exports.vfsmount_lock = probe_vfsmount_lock(); | |
1401 | + if (!ccsecurity_exports.vfsmount_lock) | |
1402 | + goto out; | |
1403 | + ccs_main_init(); | |
1404 | + ccs_update_security_ops(ops); | |
1405 | + printk(KERN_INFO "AKARI: 1.0.39 2019/08/20\n"); | |
1406 | + printk(KERN_INFO | |
1407 | + "Access Keeping And Regulating Instrument registered.\n"); | |
1408 | + return 0; | |
1409 | +out: | |
1410 | + return -EINVAL; | |
1411 | +} | |
1412 | + | |
1413 | +module_init(ccs_init); | |
1414 | +MODULE_LICENSE("GPL"); | |
1415 | + | |
1416 | +/** | |
1417 | + * ccs_used_by_cred - Check whether the given domain is in use or not. | |
1418 | + * | |
1419 | + * @domain: Pointer to "struct ccs_domain_info". | |
1420 | + * | |
1421 | + * Returns true if @domain is in use, false otherwise. | |
1422 | + * | |
1423 | + * Caller holds rcu_read_lock(). | |
1424 | + */ | |
1425 | +bool ccs_used_by_cred(const struct ccs_domain_info *domain) | |
1426 | +{ | |
1427 | + return false; | |
1428 | +} | |
1429 | + | |
1430 | +/** | |
1431 | + * ccs_add_task_security - Add "struct ccs_security" to list. | |
1432 | + * | |
1433 | + * @ptr: Pointer to "struct ccs_security". | |
1434 | + * @list: Pointer to "struct list_head". | |
1435 | + * | |
1436 | + * Returns nothing. | |
1437 | + */ | |
1438 | +static void ccs_add_task_security(struct ccs_security *ptr, | |
1439 | + struct list_head *list) | |
1440 | +{ | |
1441 | + unsigned long flags; | |
1442 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
1443 | + list_add_rcu(&ptr->list, list); | |
1444 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
1445 | +} | |
1446 | + | |
1447 | +/** | |
1448 | + * __ccs_alloc_task_security - Allocate memory for new tasks. | |
1449 | + * | |
1450 | + * @task: Pointer to "struct task_struct". | |
1451 | + * | |
1452 | + * Returns 0 on success, negative value otherwise. | |
1453 | + */ | |
1454 | +static int __ccs_alloc_task_security(const struct task_struct *task) | |
1455 | +{ | |
1456 | + struct ccs_security *old_security = ccs_current_security(); | |
1457 | + struct ccs_security *new_security = kzalloc(sizeof(*new_security), | |
1458 | + GFP_KERNEL); | |
1459 | + struct list_head *list = &ccs_task_security_list | |
1460 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
1461 | + if (!new_security) | |
1462 | + return -ENOMEM; | |
1463 | + new_security->task = task; | |
1464 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
1465 | + new_security->ccs_flags = old_security->ccs_flags; | |
1466 | + ccs_add_task_security(new_security, list); | |
1467 | + return 0; | |
1468 | +} | |
1469 | + | |
1470 | +/** | |
1471 | + * ccs_find_task_security - Find "struct ccs_security" for given task. | |
1472 | + * | |
1473 | + * @task: Pointer to "struct task_struct". | |
1474 | + * | |
1475 | + * Returns pointer to "struct ccs_security" on success, &ccs_oom_security on | |
1476 | + * out of memory, &ccs_default_security otherwise. | |
1477 | + * | |
1478 | + * If @task is current thread and "struct ccs_security" for current thread was | |
1479 | + * not found, I try to allocate it. But if allocation failed, current thread | |
1480 | + * will be killed by SIGKILL. Note that if current->pid == 1, sending SIGKILL | |
1481 | + * won't work. | |
1482 | + */ | |
1483 | +struct ccs_security *ccs_find_task_security(const struct task_struct *task) | |
1484 | +{ | |
1485 | + struct ccs_security *ptr; | |
1486 | + struct list_head *list = &ccs_task_security_list | |
1487 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
1488 | + /* Make sure INIT_LIST_HEAD() in ccs_mm_init() takes effect. */ | |
1489 | + while (!list->next) | |
1490 | + smp_rmb(); | |
1491 | + rcu_read_lock(); | |
1492 | + list_for_each_entry_rcu(ptr, list, list) { | |
1493 | + if (ptr->task != task) | |
1494 | + continue; | |
1495 | + rcu_read_unlock(); | |
1496 | + return ptr; | |
1497 | + } | |
1498 | + rcu_read_unlock(); | |
1499 | + if (task != current) | |
1500 | + return &ccs_default_security; | |
1501 | + /* Use GFP_ATOMIC because caller may have called rcu_read_lock(). */ | |
1502 | + ptr = kzalloc(sizeof(*ptr), GFP_ATOMIC); | |
1503 | + if (!ptr) { | |
1504 | + printk(KERN_WARNING "Unable to allocate memory for pid=%u\n", | |
1505 | + task->pid); | |
1506 | + send_sig(SIGKILL, current, 0); | |
1507 | + return &ccs_oom_security; | |
1508 | + } | |
1509 | + *ptr = ccs_default_security; | |
1510 | + ptr->task = task; | |
1511 | + ccs_add_task_security(ptr, list); | |
1512 | + return ptr; | |
1513 | +} | |
1514 | + | |
1515 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
1516 | + | |
1517 | +/** | |
1518 | + * ccs_rcu_free - RCU callback for releasing "struct ccs_security". | |
1519 | + * | |
1520 | + * @rcu: Pointer to "struct rcu_head". | |
1521 | + * | |
1522 | + * Returns nothing. | |
1523 | + */ | |
1524 | +static void ccs_rcu_free(struct rcu_head *rcu) | |
1525 | +{ | |
1526 | + struct ccs_security *ptr = container_of(rcu, typeof(*ptr), rcu); | |
1527 | + kfree(ptr); | |
1528 | +} | |
1529 | + | |
1530 | +#else | |
1531 | + | |
1532 | +/** | |
1533 | + * ccs_rcu_free - RCU callback for releasing "struct ccs_security". | |
1534 | + * | |
1535 | + * @arg: Pointer to "void". | |
1536 | + * | |
1537 | + * Returns nothing. | |
1538 | + */ | |
1539 | +static void ccs_rcu_free(void *arg) | |
1540 | +{ | |
1541 | + struct ccs_security *ptr = arg; | |
1542 | + kfree(ptr); | |
1543 | +} | |
1544 | + | |
1545 | +#endif | |
1546 | + | |
1547 | +/** | |
1548 | + * __ccs_free_task_security - Release memory associated with "struct task_struct". | |
1549 | + * | |
1550 | + * @task: Pointer to "struct task_struct". | |
1551 | + * | |
1552 | + * Returns nothing. | |
1553 | + */ | |
1554 | +static void __ccs_free_task_security(const struct task_struct *task) | |
1555 | +{ | |
1556 | + unsigned long flags; | |
1557 | + struct ccs_security *ptr = ccs_find_task_security(task); | |
1558 | + if (ptr == &ccs_default_security || ptr == &ccs_oom_security) | |
1559 | + return; | |
1560 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
1561 | + list_del_rcu(&ptr->list); | |
1562 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
1563 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
1564 | + call_rcu(&ptr->rcu, ccs_rcu_free); | |
1565 | +#else | |
1566 | + call_rcu(&ptr->rcu, ccs_rcu_free, ptr); | |
1567 | +#endif | |
1568 | +} |
@@ -0,0 +1,2246 @@ | ||
1 | +/* | |
2 | + * lsm.c | |
3 | + * | |
4 | + * Copyright (C) 2010-2015 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | |
5 | + * | |
6 | + * Version: 1.0.39 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include "internal.h" | |
10 | +#include "probe.h" | |
11 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0) | |
12 | +#define USE_UMODE_T | |
13 | +#else | |
14 | +#include "check_umode_t.h" | |
15 | +#endif | |
16 | + | |
17 | +/* Prototype definition. */ | |
18 | +static void ccs_task_security_gc(void); | |
19 | +static int ccs_copy_cred_security(const struct cred *new, | |
20 | + const struct cred *old, gfp_t gfp); | |
21 | +static struct ccs_security *ccs_find_cred_security(const struct cred *cred); | |
22 | +static DEFINE_SPINLOCK(ccs_task_security_list_lock); | |
23 | +static atomic_t ccs_in_execve_tasks = ATOMIC_INIT(0); | |
24 | +/* | |
25 | + * List of "struct ccs_security" for "struct pid". | |
26 | + * | |
27 | + * All instances on this list is guaranteed that "struct ccs_security"->pid != | |
28 | + * NULL. Also, instances on this list that are in execve() are guaranteed that | |
29 | + * "struct ccs_security"->cred remembers "struct linux_binprm"->cred with a | |
30 | + * refcount on "struct linux_binprm"->cred. | |
31 | + */ | |
32 | +struct list_head ccs_task_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
33 | +/* | |
34 | + * List of "struct ccs_security" for "struct cred". | |
35 | + * | |
36 | + * Since the number of "struct cred" is nearly equals to the number of | |
37 | + * "struct pid", we allocate hash tables like ccs_task_security_list. | |
38 | + * | |
39 | + * All instances on this list are guaranteed that "struct ccs_security"->pid == | |
40 | + * NULL and "struct ccs_security"->cred != NULL. | |
41 | + */ | |
42 | +static struct list_head ccs_cred_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
43 | + | |
44 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
45 | +static struct ccs_security ccs_oom_security = { | |
46 | + .ccs_domain_info = &ccs_kernel_domain | |
47 | +}; | |
48 | + | |
49 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
50 | +static struct ccs_security ccs_default_security = { | |
51 | + .ccs_domain_info = &ccs_kernel_domain | |
52 | +}; | |
53 | + | |
54 | +/* For exporting variables and functions. */ | |
55 | +struct ccsecurity_exports ccsecurity_exports; | |
56 | +/* Members are updated by loadable kernel module. */ | |
57 | +struct ccsecurity_operations ccsecurity_ops; | |
58 | + | |
59 | +/* Function pointers originally registered by register_security(). */ | |
60 | +static struct security_operations original_security_ops /* = *security_ops; */; | |
61 | + | |
62 | +#ifdef CONFIG_AKARI_TRACE_EXECVE_COUNT | |
63 | + | |
64 | +/** | |
65 | + * ccs_update_ee_counter - Update "struct ccs_execve" counter. | |
66 | + * | |
67 | + * @count: Count to increment or decrement. | |
68 | + * | |
69 | + * Returns updated counter. | |
70 | + */ | |
71 | +static unsigned int ccs_update_ee_counter(int count) | |
72 | +{ | |
73 | + /* Debug counter for detecting "struct ccs_execve" memory leak. */ | |
74 | + static atomic_t ccs_ee_counter = ATOMIC_INIT(0); | |
75 | + return atomic_add_return(count, &ccs_ee_counter); | |
76 | +} | |
77 | + | |
78 | +/** | |
79 | + * ccs_audit_alloc_execve - Audit allocation of "struct ccs_execve". | |
80 | + * | |
81 | + * @ee: Pointer to "struct ccs_execve". | |
82 | + * | |
83 | + * Returns nothing. | |
84 | + */ | |
85 | +void ccs_audit_alloc_execve(const struct ccs_execve * const ee) | |
86 | +{ | |
87 | + printk(KERN_INFO "AKARI: Allocated %p by pid=%u (count=%u)\n", ee, | |
88 | + current->pid, ccs_update_ee_counter(1) - 1); | |
89 | +} | |
90 | + | |
91 | +/** | |
92 | + * ccs_audit_free_execve - Audit release of "struct ccs_execve". | |
93 | + * | |
94 | + * @ee: Pointer to "struct ccs_execve". | |
95 | + * @task: True if released by current task, false otherwise. | |
96 | + * | |
97 | + * Returns nothing. | |
98 | + */ | |
99 | +void ccs_audit_free_execve(const struct ccs_execve * const ee, | |
100 | + const bool is_current) | |
101 | +{ | |
102 | + const unsigned int tmp = ccs_update_ee_counter(-1); | |
103 | + if (is_current) | |
104 | + printk(KERN_INFO "AKARI: Releasing %p by pid=%u (count=%u)\n", | |
105 | + ee, current->pid, tmp); | |
106 | + else | |
107 | + printk(KERN_INFO "AKARI: Releasing %p by kernel (count=%u)\n", | |
108 | + ee, tmp); | |
109 | +} | |
110 | + | |
111 | +#endif | |
112 | + | |
113 | +#if !defined(CONFIG_AKARI_DEBUG) | |
114 | +#define ccs_debug_trace(pos) do { } while (0) | |
115 | +#else | |
116 | +#define ccs_debug_trace(pos) \ | |
117 | + do { \ | |
118 | + static bool done; \ | |
119 | + if (!done) { \ | |
120 | + printk(KERN_INFO \ | |
121 | + "AKARI: Debug trace: " pos " of 4\n"); \ | |
122 | + done = true; \ | |
123 | + } \ | |
124 | + } while (0) | |
125 | +#endif | |
126 | + | |
127 | +/** | |
128 | + * ccs_clear_execve - Release memory used by do_execve(). | |
129 | + * | |
130 | + * @ret: 0 if do_execve() succeeded, negative value otherwise. | |
131 | + * @security: Pointer to "struct ccs_security". | |
132 | + * | |
133 | + * Returns nothing. | |
134 | + */ | |
135 | +static void ccs_clear_execve(int ret, struct ccs_security *security) | |
136 | +{ | |
137 | + struct ccs_execve *ee; | |
138 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
139 | + return; | |
140 | + ee = security->ee; | |
141 | + security->ee = NULL; | |
142 | + if (!ee) | |
143 | + return; | |
144 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31) | |
145 | + /* | |
146 | + * Drop refcount on "struct cred" in "struct linux_binprm" and forget | |
147 | + * it. | |
148 | + */ | |
149 | + put_cred(security->cred); | |
150 | + security->cred = NULL; | |
151 | +#endif | |
152 | + atomic_dec(&ccs_in_execve_tasks); | |
153 | + ccs_finish_execve(ret, ee); | |
154 | +} | |
155 | + | |
156 | +/** | |
157 | + * ccs_rcu_free - RCU callback for releasing "struct ccs_security". | |
158 | + * | |
159 | + * @rcu: Pointer to "struct rcu_head". | |
160 | + * | |
161 | + * Returns nothing. | |
162 | + */ | |
163 | +static void ccs_rcu_free(struct rcu_head *rcu) | |
164 | +{ | |
165 | + struct ccs_security *ptr = container_of(rcu, typeof(*ptr), rcu); | |
166 | + struct ccs_execve *ee = ptr->ee; | |
167 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31) | |
168 | + /* | |
169 | + * If this security context was associated with "struct pid" and | |
170 | + * ptr->ccs_flags has CCS_TASK_IS_IN_EXECVE set, it indicates that a | |
171 | + * "struct task_struct" associated with this security context exited | |
172 | + * immediately after do_execve() has failed. | |
173 | + */ | |
174 | + if (ptr->pid && (ptr->ccs_flags & CCS_TASK_IS_IN_EXECVE)) { | |
175 | + ccs_debug_trace("1"); | |
176 | + atomic_dec(&ccs_in_execve_tasks); | |
177 | + } | |
178 | +#else | |
179 | + /* | |
180 | + * If this security context was associated with "struct pid" and | |
181 | + * remembers "struct cred" in "struct linux_binprm", it indicates that | |
182 | + * a "struct task_struct" associated with this security context exited | |
183 | + * immediately after do_execve() has failed. | |
184 | + */ | |
185 | + if (ptr->pid && ptr->cred) { | |
186 | + ccs_debug_trace("1"); | |
187 | + put_cred(ptr->cred); | |
188 | + atomic_dec(&ccs_in_execve_tasks); | |
189 | + } | |
190 | +#endif | |
191 | + /* | |
192 | + * If this security context was associated with "struct pid", | |
193 | + * drop refcount obtained by get_pid() in ccs_find_task_security(). | |
194 | + */ | |
195 | + if (ptr->pid) { | |
196 | + ccs_debug_trace("2"); | |
197 | + put_pid(ptr->pid); | |
198 | + } | |
199 | + if (ee) { | |
200 | + ccs_debug_trace("3"); | |
201 | + ccs_audit_free_execve(ee, false); | |
202 | + kfree(ee->handler_path); | |
203 | + kfree(ee); | |
204 | + } | |
205 | + kfree(ptr); | |
206 | +} | |
207 | + | |
208 | +/** | |
209 | + * ccs_del_security - Release "struct ccs_security". | |
210 | + * | |
211 | + * @ptr: Pointer to "struct ccs_security". | |
212 | + * | |
213 | + * Returns nothing. | |
214 | + */ | |
215 | +static void ccs_del_security(struct ccs_security *ptr) | |
216 | +{ | |
217 | + unsigned long flags; | |
218 | + if (ptr == &ccs_default_security || ptr == &ccs_oom_security) | |
219 | + return; | |
220 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
221 | + list_del_rcu(&ptr->list); | |
222 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
223 | + call_rcu(&ptr->rcu, ccs_rcu_free); | |
224 | +} | |
225 | + | |
226 | +/** | |
227 | + * ccs_add_cred_security - Add "struct ccs_security" to list. | |
228 | + * | |
229 | + * @ptr: Pointer to "struct ccs_security". | |
230 | + * | |
231 | + * Returns nothing. | |
232 | + */ | |
233 | +static void ccs_add_cred_security(struct ccs_security *ptr) | |
234 | +{ | |
235 | + unsigned long flags; | |
236 | + struct list_head *list = &ccs_cred_security_list | |
237 | + [hash_ptr((void *) ptr->cred, CCS_TASK_SECURITY_HASH_BITS)]; | |
238 | +#ifdef CONFIG_AKARI_DEBUG | |
239 | + if (ptr->pid) | |
240 | + printk(KERN_INFO "AKARI: \"struct ccs_security\"->pid != NULL" | |
241 | + "\n"); | |
242 | +#endif | |
243 | + ptr->pid = NULL; | |
244 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
245 | + list_add_rcu(&ptr->list, list); | |
246 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
247 | +} | |
248 | + | |
249 | +/** | |
250 | + * ccs_task_create - Make snapshot of security context for new task. | |
251 | + * | |
252 | + * @clone_flags: Flags passed to clone(). | |
253 | + * | |
254 | + * Returns 0 on success, negative value otherwise. | |
255 | + */ | |
256 | +static int ccs_task_create(unsigned long clone_flags) | |
257 | +{ | |
258 | + int rc; | |
259 | + struct ccs_security *old_security; | |
260 | + struct ccs_security *new_security; | |
261 | + struct cred *cred = prepare_creds(); | |
262 | + if (!cred) | |
263 | + return -ENOMEM; | |
264 | + while (!original_security_ops.task_create) | |
265 | + smp_rmb(); | |
266 | + rc = original_security_ops.task_create(clone_flags); | |
267 | + if (rc) { | |
268 | + abort_creds(cred); | |
269 | + return rc; | |
270 | + } | |
271 | + old_security = ccs_find_task_security(current); | |
272 | + new_security = ccs_find_cred_security(cred); | |
273 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
274 | + new_security->ccs_flags = old_security->ccs_flags; | |
275 | + return commit_creds(cred); | |
276 | +} | |
277 | + | |
278 | +/** | |
279 | + * ccs_cred_prepare - Allocate memory for new credentials. | |
280 | + * | |
281 | + * @new: Pointer to "struct cred". | |
282 | + * @old: Pointer to "struct cred". | |
283 | + * @gfp: Memory allocation flags. | |
284 | + * | |
285 | + * Returns 0 on success, negative value otherwise. | |
286 | + */ | |
287 | +static int ccs_cred_prepare(struct cred *new, const struct cred *old, | |
288 | + gfp_t gfp) | |
289 | +{ | |
290 | + int rc; | |
291 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31) | |
292 | + /* | |
293 | + * For checking whether reverting domain transition is needed or not. | |
294 | + * | |
295 | + * See ccs_find_task_security() for reason. | |
296 | + */ | |
297 | + if (gfp == GFP_KERNEL) | |
298 | + ccs_find_task_security(current); | |
299 | +#endif | |
300 | + rc = ccs_copy_cred_security(new, old, gfp); | |
301 | + if (rc) | |
302 | + return rc; | |
303 | + if (gfp == GFP_KERNEL) | |
304 | + ccs_task_security_gc(); | |
305 | + while (!original_security_ops.cred_prepare) | |
306 | + smp_rmb(); | |
307 | + rc = original_security_ops.cred_prepare(new, old, gfp); | |
308 | + if (rc) | |
309 | + ccs_del_security(ccs_find_cred_security(new)); | |
310 | + return rc; | |
311 | +} | |
312 | + | |
313 | +/** | |
314 | + * ccs_cred_free - Release memory used by credentials. | |
315 | + * | |
316 | + * @cred: Pointer to "struct cred". | |
317 | + * | |
318 | + * Returns nothing. | |
319 | + */ | |
320 | +static void ccs_cred_free(struct cred *cred) | |
321 | +{ | |
322 | + while (!original_security_ops.cred_free) | |
323 | + smp_rmb(); | |
324 | + original_security_ops.cred_free(cred); | |
325 | + ccs_del_security(ccs_find_cred_security(cred)); | |
326 | +} | |
327 | + | |
328 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 32) | |
329 | + | |
330 | +/** | |
331 | + * ccs_alloc_cred_security - Allocate memory for new credentials. | |
332 | + * | |
333 | + * @cred: Pointer to "struct cred". | |
334 | + * @gfp: Memory allocation flags. | |
335 | + * | |
336 | + * Returns 0 on success, negative value otherwise. | |
337 | + */ | |
338 | +static int ccs_alloc_cred_security(const struct cred *cred, gfp_t gfp) | |
339 | +{ | |
340 | + struct ccs_security *new_security = kzalloc(sizeof(*new_security), | |
341 | + gfp); | |
342 | + if (!new_security) | |
343 | + return -ENOMEM; | |
344 | + new_security->cred = cred; | |
345 | + ccs_add_cred_security(new_security); | |
346 | + return 0; | |
347 | +} | |
348 | + | |
349 | +/** | |
350 | + * ccs_cred_alloc_blank - Allocate memory for new credentials. | |
351 | + * | |
352 | + * @new: Pointer to "struct cred". | |
353 | + * @gfp: Memory allocation flags. | |
354 | + * | |
355 | + * Returns 0 on success, negative value otherwise. | |
356 | + */ | |
357 | +static int ccs_cred_alloc_blank(struct cred *new, gfp_t gfp) | |
358 | +{ | |
359 | + int rc = ccs_alloc_cred_security(new, gfp); | |
360 | + if (rc) | |
361 | + return rc; | |
362 | + while (!original_security_ops.cred_alloc_blank) | |
363 | + smp_rmb(); | |
364 | + rc = original_security_ops.cred_alloc_blank(new, gfp); | |
365 | + if (rc) | |
366 | + ccs_del_security(ccs_find_cred_security(new)); | |
367 | + return rc; | |
368 | +} | |
369 | + | |
370 | +/** | |
371 | + * ccs_cred_transfer - Transfer "struct ccs_security" between credentials. | |
372 | + * | |
373 | + * @new: Pointer to "struct cred". | |
374 | + * @old: Pointer to "struct cred". | |
375 | + * | |
376 | + * Returns nothing. | |
377 | + */ | |
378 | +static void ccs_cred_transfer(struct cred *new, const struct cred *old) | |
379 | +{ | |
380 | + struct ccs_security *new_security; | |
381 | + struct ccs_security *old_security; | |
382 | + while (!original_security_ops.cred_transfer) | |
383 | + smp_rmb(); | |
384 | + original_security_ops.cred_transfer(new, old); | |
385 | + new_security = ccs_find_cred_security(new); | |
386 | + old_security = ccs_find_cred_security(old); | |
387 | + if (new_security == &ccs_default_security || | |
388 | + new_security == &ccs_oom_security || | |
389 | + old_security == &ccs_default_security || | |
390 | + old_security == &ccs_oom_security) | |
391 | + return; | |
392 | + new_security->ccs_flags = old_security->ccs_flags; | |
393 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
394 | +} | |
395 | + | |
396 | +#endif | |
397 | + | |
398 | +/** | |
399 | + * ccs_bprm_committing_creds - A hook which is called when do_execve() succeeded. | |
400 | + * | |
401 | + * @bprm: Pointer to "struct linux_binprm". | |
402 | + * | |
403 | + * Returns nothing. | |
404 | + */ | |
405 | +static void ccs_bprm_committing_creds(struct linux_binprm *bprm) | |
406 | +{ | |
407 | + struct ccs_security *old_security; | |
408 | + struct ccs_security *new_security; | |
409 | + while (!original_security_ops.bprm_committing_creds) | |
410 | + smp_rmb(); | |
411 | + original_security_ops.bprm_committing_creds(bprm); | |
412 | + old_security = ccs_current_security(); | |
413 | + if (old_security == &ccs_default_security || | |
414 | + old_security == &ccs_oom_security) | |
415 | + return; | |
416 | + ccs_clear_execve(0, old_security); | |
417 | + /* Update current task's cred's domain for future fork(). */ | |
418 | + new_security = ccs_find_cred_security(bprm->cred); | |
419 | + new_security->ccs_flags = old_security->ccs_flags; | |
420 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
421 | +} | |
422 | + | |
423 | +/** | |
424 | + * ccs_bprm_check_security - Check permission for execve(). | |
425 | + * | |
426 | + * @bprm: Pointer to "struct linux_binprm". | |
427 | + * | |
428 | + * Returns 0 on success, negative value otherwise. | |
429 | + */ | |
430 | +static int ccs_bprm_check_security(struct linux_binprm *bprm) | |
431 | +{ | |
432 | + struct ccs_security *security = ccs_current_security(); | |
433 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
434 | + return -ENOMEM; | |
435 | + if (!security->ee) { | |
436 | + int rc; | |
437 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
438 | + if (!ccs_policy_loaded) | |
439 | + ccs_load_policy(bprm->filename); | |
440 | +#endif | |
441 | + rc = ccs_start_execve(bprm, &security->ee); | |
442 | + if (security->ee) { | |
443 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31) | |
444 | + /* | |
445 | + * Get refcount on "struct cred" in | |
446 | + * "struct linux_binprm" and remember it. | |
447 | + */ | |
448 | + get_cred(bprm->cred); | |
449 | + security->cred = bprm->cred; | |
450 | +#endif | |
451 | + atomic_inc(&ccs_in_execve_tasks); | |
452 | + } | |
453 | + if (rc) | |
454 | + return rc; | |
455 | + } | |
456 | + while (!original_security_ops.bprm_check_security) | |
457 | + smp_rmb(); | |
458 | + return original_security_ops.bprm_check_security(bprm); | |
459 | +} | |
460 | + | |
461 | +/** | |
462 | + * ccs_open - Check permission for open(). | |
463 | + * | |
464 | + * @f: Pointer to "struct file". | |
465 | + * | |
466 | + * Returns 0 on success, negative value otherwise. | |
467 | + */ | |
468 | +static int ccs_open(struct file *f) | |
469 | +{ | |
470 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) | |
471 | + return ccs_open_permission(f); | |
472 | +#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 6 | |
473 | + return ccs_open_permission(f->f_path.dentry, f->f_path.mnt, | |
474 | + f->f_flags); | |
475 | +#else | |
476 | + return ccs_open_permission(f->f_path.dentry, f->f_path.mnt, | |
477 | + f->f_flags + 1); | |
478 | +#endif | |
479 | +} | |
480 | + | |
481 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
482 | + | |
483 | +/** | |
484 | + * ccs_file_open - Check permission for open(). | |
485 | + * | |
486 | + * @f: Pointer to "struct file". | |
487 | + * @cred: Pointer to "struct cred". | |
488 | + * | |
489 | + * Returns 0 on success, negative value otherwise. | |
490 | + */ | |
491 | +static int ccs_file_open(struct file *f, const struct cred *cred) | |
492 | +{ | |
493 | + int rc = ccs_open(f); | |
494 | + if (rc) | |
495 | + return rc; | |
496 | + while (!original_security_ops.file_open) | |
497 | + smp_rmb(); | |
498 | + return original_security_ops.file_open(f, cred); | |
499 | +} | |
500 | + | |
501 | +#else | |
502 | + | |
503 | +/** | |
504 | + * ccs_dentry_open - Check permission for open(). | |
505 | + * | |
506 | + * @f: Pointer to "struct file". | |
507 | + * @cred: Pointer to "struct cred". | |
508 | + * | |
509 | + * Returns 0 on success, negative value otherwise. | |
510 | + */ | |
511 | +static int ccs_dentry_open(struct file *f, const struct cred *cred) | |
512 | +{ | |
513 | + int rc = ccs_open(f); | |
514 | + if (rc) | |
515 | + return rc; | |
516 | + while (!original_security_ops.dentry_open) | |
517 | + smp_rmb(); | |
518 | + return original_security_ops.dentry_open(f, cred); | |
519 | +} | |
520 | + | |
521 | +#endif | |
522 | + | |
523 | +#if defined(CONFIG_SECURITY_PATH) | |
524 | + | |
525 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
526 | + | |
527 | +/** | |
528 | + * ccs_path_chown - Check permission for chown()/chgrp(). | |
529 | + * | |
530 | + * @path: Pointer to "struct path". | |
531 | + * @user: User ID. | |
532 | + * @group: Group ID. | |
533 | + * | |
534 | + * Returns 0 on success, negative value otherwise. | |
535 | + */ | |
536 | +static int ccs_path_chown(struct path *path, kuid_t user, kgid_t group) | |
537 | +{ | |
538 | + int rc = ccs_chown_permission(path->dentry, path->mnt, user, group); | |
539 | + if (rc) | |
540 | + return rc; | |
541 | + while (!original_security_ops.path_chown) | |
542 | + smp_rmb(); | |
543 | + return original_security_ops.path_chown(path, user, group); | |
544 | +} | |
545 | + | |
546 | +/** | |
547 | + * ccs_path_chmod - Check permission for chmod(). | |
548 | + * | |
549 | + * @path: Pointer to "struct path". | |
550 | + * @mode: Mode. | |
551 | + * | |
552 | + * Returns 0 on success, negative value otherwise. | |
553 | + */ | |
554 | +static int ccs_path_chmod(struct path *path, umode_t mode) | |
555 | +{ | |
556 | + int rc = ccs_chmod_permission(path->dentry, path->mnt, mode); | |
557 | + if (rc) | |
558 | + return rc; | |
559 | + while (!original_security_ops.path_chmod) | |
560 | + smp_rmb(); | |
561 | + return original_security_ops.path_chmod(path, mode); | |
562 | +} | |
563 | + | |
564 | +/** | |
565 | + * ccs_path_chroot - Check permission for chroot(). | |
566 | + * | |
567 | + * @path: Pointer to "struct path". | |
568 | + * | |
569 | + * Returns 0 on success, negative value otherwise. | |
570 | + */ | |
571 | +static int ccs_path_chroot(struct path *path) | |
572 | +{ | |
573 | + int rc = ccs_chroot_permission(path); | |
574 | + if (rc) | |
575 | + return rc; | |
576 | + while (!original_security_ops.path_chroot) | |
577 | + smp_rmb(); | |
578 | + return original_security_ops.path_chroot(path); | |
579 | +} | |
580 | + | |
581 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) | |
582 | + | |
583 | +/** | |
584 | + * ccs_path_chown - Check permission for chown()/chgrp(). | |
585 | + * | |
586 | + * @path: Pointer to "struct path". | |
587 | + * @user: User ID. | |
588 | + * @group: Group ID. | |
589 | + * | |
590 | + * Returns 0 on success, negative value otherwise. | |
591 | + */ | |
592 | +static int ccs_path_chown(struct path *path, uid_t user, gid_t group) | |
593 | +{ | |
594 | + int rc = ccs_chown_permission(path->dentry, path->mnt, user, group); | |
595 | + if (rc) | |
596 | + return rc; | |
597 | + while (!original_security_ops.path_chown) | |
598 | + smp_rmb(); | |
599 | + return original_security_ops.path_chown(path, user, group); | |
600 | +} | |
601 | + | |
602 | +#if defined(USE_UMODE_T) | |
603 | + | |
604 | +/** | |
605 | + * ccs_path_chmod - Check permission for chmod(). | |
606 | + * | |
607 | + * @path: Pointer to "struct path". | |
608 | + * @mode: Mode. | |
609 | + * | |
610 | + * Returns 0 on success, negative value otherwise. | |
611 | + */ | |
612 | +static int ccs_path_chmod(struct path *path, umode_t mode) | |
613 | +{ | |
614 | + int rc = ccs_chmod_permission(path->dentry, path->mnt, mode); | |
615 | + if (rc) | |
616 | + return rc; | |
617 | + while (!original_security_ops.path_chmod) | |
618 | + smp_rmb(); | |
619 | + return original_security_ops.path_chmod(path, mode); | |
620 | +} | |
621 | + | |
622 | +#else | |
623 | + | |
624 | +/** | |
625 | + * ccs_path_chmod - Check permission for chmod(). | |
626 | + * | |
627 | + * @dentry: Pointer to "struct dentry". | |
628 | + * @vfsmnt: Pointer to "struct vfsmount". | |
629 | + * @mode: Mode. | |
630 | + * | |
631 | + * Returns 0 on success, negative value otherwise. | |
632 | + */ | |
633 | +static int ccs_path_chmod(struct dentry *dentry, struct vfsmount *vfsmnt, | |
634 | + mode_t mode) | |
635 | +{ | |
636 | + int rc = ccs_chmod_permission(dentry, vfsmnt, mode); | |
637 | + if (rc) | |
638 | + return rc; | |
639 | + while (!original_security_ops.path_chmod) | |
640 | + smp_rmb(); | |
641 | + return original_security_ops.path_chmod(dentry, vfsmnt, mode); | |
642 | +} | |
643 | + | |
644 | +#endif | |
645 | + | |
646 | +/** | |
647 | + * ccs_path_chroot - Check permission for chroot(). | |
648 | + * | |
649 | + * @path: Pointer to "struct path". | |
650 | + * | |
651 | + * Returns 0 on success, negative value otherwise. | |
652 | + */ | |
653 | +static int ccs_path_chroot(struct path *path) | |
654 | +{ | |
655 | + int rc = ccs_chroot_permission(path); | |
656 | + if (rc) | |
657 | + return rc; | |
658 | + while (!original_security_ops.path_chroot) | |
659 | + smp_rmb(); | |
660 | + return original_security_ops.path_chroot(path); | |
661 | +} | |
662 | + | |
663 | +#endif | |
664 | + | |
665 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) | |
666 | + | |
667 | +/** | |
668 | + * ccs_path_truncate - Check permission for truncate(). | |
669 | + * | |
670 | + * @path: Pointer to "struct path". | |
671 | + * | |
672 | + * Returns 0 on success, negative value otherwise. | |
673 | + */ | |
674 | +static int ccs_path_truncate(struct path *path) | |
675 | +{ | |
676 | + int rc = ccs_truncate_permission(path->dentry, path->mnt); | |
677 | + if (rc) | |
678 | + return rc; | |
679 | + while (!original_security_ops.path_truncate) | |
680 | + smp_rmb(); | |
681 | + return original_security_ops.path_truncate(path); | |
682 | +} | |
683 | + | |
684 | +#else | |
685 | + | |
686 | +/** | |
687 | + * ccs_path_truncate - Check permission for truncate(). | |
688 | + * | |
689 | + * @path: Pointer to "struct path". | |
690 | + * @length: New length. | |
691 | + * @time_attrs: New time attributes. | |
692 | + * | |
693 | + * Returns 0 on success, negative value otherwise. | |
694 | + */ | |
695 | +static int ccs_path_truncate(struct path *path, loff_t length, | |
696 | + unsigned int time_attrs) | |
697 | +{ | |
698 | + int rc = ccs_truncate_permission(path->dentry, path->mnt); | |
699 | + if (rc) | |
700 | + return rc; | |
701 | + while (!original_security_ops.path_truncate) | |
702 | + smp_rmb(); | |
703 | + return original_security_ops.path_truncate(path, length, time_attrs); | |
704 | +} | |
705 | + | |
706 | +#endif | |
707 | + | |
708 | +#endif | |
709 | + | |
710 | +/** | |
711 | + * ccs_inode_setattr - Check permission for chown()/chgrp()/chmod()/truncate(). | |
712 | + * | |
713 | + * @dentry: Pointer to "struct dentry". | |
714 | + * @attr: Pointer to "struct iattr". | |
715 | + * | |
716 | + * Returns 0 on success, negative value otherwise. | |
717 | + */ | |
718 | +static int ccs_inode_setattr(struct dentry *dentry, struct iattr *attr) | |
719 | +{ | |
720 | + int rc = 0; | |
721 | +#if !defined(CONFIG_SECURITY_PATH) || LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33) | |
722 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
723 | + if (attr->ia_valid & ATTR_UID) | |
724 | + rc = ccs_chown_permission(dentry, NULL, attr->ia_uid, | |
725 | + INVALID_GID); | |
726 | + if (!rc && (attr->ia_valid & ATTR_GID)) | |
727 | + rc = ccs_chown_permission(dentry, NULL, INVALID_UID, | |
728 | + attr->ia_gid); | |
729 | +#else | |
730 | + if (attr->ia_valid & ATTR_UID) | |
731 | + rc = ccs_chown_permission(dentry, NULL, attr->ia_uid, -1); | |
732 | + if (!rc && (attr->ia_valid & ATTR_GID)) | |
733 | + rc = ccs_chown_permission(dentry, NULL, -1, attr->ia_gid); | |
734 | +#endif | |
735 | + if (!rc && (attr->ia_valid & ATTR_MODE)) | |
736 | + rc = ccs_chmod_permission(dentry, NULL, attr->ia_mode); | |
737 | +#endif | |
738 | +#if !defined(CONFIG_SECURITY_PATH) | |
739 | + if (!rc && (attr->ia_valid & ATTR_SIZE)) | |
740 | + rc = ccs_truncate_permission(dentry, NULL); | |
741 | +#endif | |
742 | + if (rc) | |
743 | + return rc; | |
744 | + while (!original_security_ops.inode_setattr) | |
745 | + smp_rmb(); | |
746 | + return original_security_ops.inode_setattr(dentry, attr); | |
747 | +} | |
748 | + | |
749 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 1, 0) | |
750 | + | |
751 | +/** | |
752 | + * ccs_inode_getattr - Check permission for stat(). | |
753 | + * | |
754 | + * @path: Pointer to "struct path". | |
755 | + * | |
756 | + * Returns 0 on success, negative value otherwise. | |
757 | + */ | |
758 | +static int ccs_inode_getattr(const struct path *path) | |
759 | +{ | |
760 | + int rc = ccs_getattr_permission(path->mnt, path->dentry); | |
761 | + if (rc) | |
762 | + return rc; | |
763 | + while (!original_security_ops.inode_getattr) | |
764 | + smp_rmb(); | |
765 | + return original_security_ops.inode_getattr(path); | |
766 | +} | |
767 | + | |
768 | +#else | |
769 | + | |
770 | +/** | |
771 | + * ccs_inode_getattr - Check permission for stat(). | |
772 | + * | |
773 | + * @mnt: Pointer to "struct vfsmount". | |
774 | + * @dentry: Pointer to "struct dentry". | |
775 | + * | |
776 | + * Returns 0 on success, negative value otherwise. | |
777 | + */ | |
778 | +static int ccs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
779 | +{ | |
780 | + int rc = ccs_getattr_permission(mnt, dentry); | |
781 | + if (rc) | |
782 | + return rc; | |
783 | + while (!original_security_ops.inode_getattr) | |
784 | + smp_rmb(); | |
785 | + return original_security_ops.inode_getattr(mnt, dentry); | |
786 | +} | |
787 | + | |
788 | +#endif | |
789 | + | |
790 | +#if defined(CONFIG_SECURITY_PATH) | |
791 | + | |
792 | +#if defined(USE_UMODE_T) | |
793 | + | |
794 | +/** | |
795 | + * ccs_path_mknod - Check permission for mknod(). | |
796 | + * | |
797 | + * @dir: Pointer to "struct path". | |
798 | + * @dentry: Pointer to "struct dentry". | |
799 | + * @mode: Create mode. | |
800 | + * @dev: Device major/minor number. | |
801 | + * | |
802 | + * Returns 0 on success, negative value otherwise. | |
803 | + */ | |
804 | +static int ccs_path_mknod(struct path *dir, struct dentry *dentry, | |
805 | + umode_t mode, unsigned int dev) | |
806 | +{ | |
807 | + int rc = ccs_mknod_permission(dentry, dir->mnt, mode, dev); | |
808 | + if (rc) | |
809 | + return rc; | |
810 | + while (!original_security_ops.path_mknod) | |
811 | + smp_rmb(); | |
812 | + return original_security_ops.path_mknod(dir, dentry, mode, dev); | |
813 | +} | |
814 | + | |
815 | +/** | |
816 | + * ccs_path_mkdir - Check permission for mkdir(). | |
817 | + * | |
818 | + * @dir: Pointer to "struct path". | |
819 | + * @dentry: Pointer to "struct dentry". | |
820 | + * @mode: Create mode. | |
821 | + * | |
822 | + * Returns 0 on success, negative value otherwise. | |
823 | + */ | |
824 | +static int ccs_path_mkdir(struct path *dir, struct dentry *dentry, | |
825 | + umode_t mode) | |
826 | +{ | |
827 | + int rc = ccs_mkdir_permission(dentry, dir->mnt, mode); | |
828 | + if (rc) | |
829 | + return rc; | |
830 | + while (!original_security_ops.path_mkdir) | |
831 | + smp_rmb(); | |
832 | + return original_security_ops.path_mkdir(dir, dentry, mode); | |
833 | +} | |
834 | + | |
835 | +#else | |
836 | + | |
837 | +/** | |
838 | + * ccs_path_mknod - Check permission for mknod(). | |
839 | + * | |
840 | + * @dir: Pointer to "struct path". | |
841 | + * @dentry: Pointer to "struct dentry". | |
842 | + * @mode: Create mode. | |
843 | + * @dev: Device major/minor number. | |
844 | + * | |
845 | + * Returns 0 on success, negative value otherwise. | |
846 | + */ | |
847 | +static int ccs_path_mknod(struct path *dir, struct dentry *dentry, int mode, | |
848 | + unsigned int dev) | |
849 | +{ | |
850 | + int rc = ccs_mknod_permission(dentry, dir->mnt, mode, dev); | |
851 | + if (rc) | |
852 | + return rc; | |
853 | + while (!original_security_ops.path_mknod) | |
854 | + smp_rmb(); | |
855 | + return original_security_ops.path_mknod(dir, dentry, mode, dev); | |
856 | +} | |
857 | + | |
858 | +/** | |
859 | + * ccs_path_mkdir - Check permission for mkdir(). | |
860 | + * | |
861 | + * @dir: Pointer to "struct path". | |
862 | + * @dentry: Pointer to "struct dentry". | |
863 | + * @mode: Create mode. | |
864 | + * | |
865 | + * Returns 0 on success, negative value otherwise. | |
866 | + */ | |
867 | +static int ccs_path_mkdir(struct path *dir, struct dentry *dentry, int mode) | |
868 | +{ | |
869 | + int rc = ccs_mkdir_permission(dentry, dir->mnt, mode); | |
870 | + if (rc) | |
871 | + return rc; | |
872 | + while (!original_security_ops.path_mkdir) | |
873 | + smp_rmb(); | |
874 | + return original_security_ops.path_mkdir(dir, dentry, mode); | |
875 | +} | |
876 | + | |
877 | +#endif | |
878 | + | |
879 | +/** | |
880 | + * ccs_path_rmdir - Check permission for rmdir(). | |
881 | + * | |
882 | + * @dir: Pointer to "struct path". | |
883 | + * @dentry: Pointer to "struct dentry". | |
884 | + * | |
885 | + * Returns 0 on success, negative value otherwise. | |
886 | + */ | |
887 | +static int ccs_path_rmdir(struct path *dir, struct dentry *dentry) | |
888 | +{ | |
889 | + int rc = ccs_rmdir_permission(dentry, dir->mnt); | |
890 | + if (rc) | |
891 | + return rc; | |
892 | + while (!original_security_ops.path_rmdir) | |
893 | + smp_rmb(); | |
894 | + return original_security_ops.path_rmdir(dir, dentry); | |
895 | +} | |
896 | + | |
897 | +/** | |
898 | + * ccs_path_unlink - Check permission for unlink(). | |
899 | + * | |
900 | + * @dir: Pointer to "struct path". | |
901 | + * @dentry: Pointer to "struct dentry". | |
902 | + * | |
903 | + * Returns 0 on success, negative value otherwise. | |
904 | + */ | |
905 | +static int ccs_path_unlink(struct path *dir, struct dentry *dentry) | |
906 | +{ | |
907 | + int rc = ccs_unlink_permission(dentry, dir->mnt); | |
908 | + if (rc) | |
909 | + return rc; | |
910 | + while (!original_security_ops.path_unlink) | |
911 | + smp_rmb(); | |
912 | + return original_security_ops.path_unlink(dir, dentry); | |
913 | +} | |
914 | + | |
915 | +/** | |
916 | + * ccs_path_symlink - Check permission for symlink(). | |
917 | + * | |
918 | + * @dir: Pointer to "struct path". | |
919 | + * @dentry: Pointer to "struct dentry". | |
920 | + * @old_name: Content of symbolic link. | |
921 | + * | |
922 | + * Returns 0 on success, negative value otherwise. | |
923 | + */ | |
924 | +static int ccs_path_symlink(struct path *dir, struct dentry *dentry, | |
925 | + const char *old_name) | |
926 | +{ | |
927 | + int rc = ccs_symlink_permission(dentry, dir->mnt, old_name); | |
928 | + if (rc) | |
929 | + return rc; | |
930 | + while (!original_security_ops.path_symlink) | |
931 | + smp_rmb(); | |
932 | + return original_security_ops.path_symlink(dir, dentry, old_name); | |
933 | +} | |
934 | + | |
935 | +/** | |
936 | + * ccs_path_rename - Check permission for rename(). | |
937 | + * | |
938 | + * @old_dir: Pointer to "struct path". | |
939 | + * @old_dentry: Pointer to "struct dentry". | |
940 | + * @new_dir: Pointer to "struct path". | |
941 | + * @new_dentry: Pointer to "struct dentry". | |
942 | + * | |
943 | + * Returns 0 on success, negative value otherwise. | |
944 | + */ | |
945 | +static int ccs_path_rename(struct path *old_dir, struct dentry *old_dentry, | |
946 | + struct path *new_dir, struct dentry *new_dentry) | |
947 | +{ | |
948 | + int rc = ccs_rename_permission(old_dentry, new_dentry, old_dir->mnt); | |
949 | + if (rc) | |
950 | + return rc; | |
951 | + while (!original_security_ops.path_rename) | |
952 | + smp_rmb(); | |
953 | + return original_security_ops.path_rename(old_dir, old_dentry, new_dir, | |
954 | + new_dentry); | |
955 | +} | |
956 | + | |
957 | +/** | |
958 | + * ccs_path_link - Check permission for link(). | |
959 | + * | |
960 | + * @old_dentry: Pointer to "struct dentry". | |
961 | + * @new_dir: Pointer to "struct path". | |
962 | + * @new_dentry: Pointer to "struct dentry". | |
963 | + * | |
964 | + * Returns 0 on success, negative value otherwise. | |
965 | + */ | |
966 | +static int ccs_path_link(struct dentry *old_dentry, struct path *new_dir, | |
967 | + struct dentry *new_dentry) | |
968 | +{ | |
969 | + int rc = ccs_link_permission(old_dentry, new_dentry, new_dir->mnt); | |
970 | + if (rc) | |
971 | + return rc; | |
972 | + while (!original_security_ops.path_link) | |
973 | + smp_rmb(); | |
974 | + return original_security_ops.path_link(old_dentry, new_dir, | |
975 | + new_dentry); | |
976 | +} | |
977 | + | |
978 | +#else | |
979 | + | |
980 | +#if defined(USE_UMODE_T) | |
981 | + | |
982 | +/** | |
983 | + * ccs_inode_mknod - Check permission for mknod(). | |
984 | + * | |
985 | + * @dir: Pointer to "struct inode". | |
986 | + * @dentry: Pointer to "struct dentry". | |
987 | + * @mode: Create mode. | |
988 | + * @dev: Device major/minor number. | |
989 | + * | |
990 | + * Returns 0 on success, negative value otherwise. | |
991 | + */ | |
992 | +static int ccs_inode_mknod(struct inode *dir, struct dentry *dentry, | |
993 | + umode_t mode, dev_t dev) | |
994 | +{ | |
995 | + int rc = ccs_mknod_permission(dentry, NULL, mode, dev); | |
996 | + if (rc) | |
997 | + return rc; | |
998 | + while (!original_security_ops.inode_mknod) | |
999 | + smp_rmb(); | |
1000 | + return original_security_ops.inode_mknod(dir, dentry, mode, dev); | |
1001 | +} | |
1002 | + | |
1003 | +/** | |
1004 | + * ccs_inode_mkdir - Check permission for mkdir(). | |
1005 | + * | |
1006 | + * @dir: Pointer to "struct inode". | |
1007 | + * @dentry: Pointer to "struct dentry". | |
1008 | + * @mode: Create mode. | |
1009 | + * | |
1010 | + * Returns 0 on success, negative value otherwise. | |
1011 | + */ | |
1012 | +static int ccs_inode_mkdir(struct inode *dir, struct dentry *dentry, | |
1013 | + umode_t mode) | |
1014 | +{ | |
1015 | + int rc = ccs_mkdir_permission(dentry, NULL, mode); | |
1016 | + if (rc) | |
1017 | + return rc; | |
1018 | + while (!original_security_ops.inode_mkdir) | |
1019 | + smp_rmb(); | |
1020 | + return original_security_ops.inode_mkdir(dir, dentry, mode); | |
1021 | +} | |
1022 | + | |
1023 | +#else | |
1024 | + | |
1025 | +/** | |
1026 | + * ccs_inode_mknod - Check permission for mknod(). | |
1027 | + * | |
1028 | + * @dir: Pointer to "struct inode". | |
1029 | + * @dentry: Pointer to "struct dentry". | |
1030 | + * @mode: Create mode. | |
1031 | + * @dev: Device major/minor number. | |
1032 | + * | |
1033 | + * Returns 0 on success, negative value otherwise. | |
1034 | + */ | |
1035 | +static int ccs_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, | |
1036 | + dev_t dev) | |
1037 | +{ | |
1038 | + int rc = ccs_mknod_permission(dentry, NULL, mode, dev); | |
1039 | + if (rc) | |
1040 | + return rc; | |
1041 | + while (!original_security_ops.inode_mknod) | |
1042 | + smp_rmb(); | |
1043 | + return original_security_ops.inode_mknod(dir, dentry, mode, dev); | |
1044 | +} | |
1045 | + | |
1046 | +/** | |
1047 | + * ccs_inode_mkdir - Check permission for mkdir(). | |
1048 | + * | |
1049 | + * @dir: Pointer to "struct inode". | |
1050 | + * @dentry: Pointer to "struct dentry". | |
1051 | + * @mode: Create mode. | |
1052 | + * | |
1053 | + * Returns 0 on success, negative value otherwise. | |
1054 | + */ | |
1055 | +static int ccs_inode_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1056 | +{ | |
1057 | + int rc = ccs_mkdir_permission(dentry, NULL, mode); | |
1058 | + if (rc) | |
1059 | + return rc; | |
1060 | + while (!original_security_ops.inode_mkdir) | |
1061 | + smp_rmb(); | |
1062 | + return original_security_ops.inode_mkdir(dir, dentry, mode); | |
1063 | +} | |
1064 | + | |
1065 | +#endif | |
1066 | + | |
1067 | +/** | |
1068 | + * ccs_inode_rmdir - Check permission for rmdir(). | |
1069 | + * | |
1070 | + * @dir: Pointer to "struct inode". | |
1071 | + * @dentry: Pointer to "struct dentry". | |
1072 | + * | |
1073 | + * Returns 0 on success, negative value otherwise. | |
1074 | + */ | |
1075 | +static int ccs_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
1076 | +{ | |
1077 | + int rc = ccs_rmdir_permission(dentry, NULL); | |
1078 | + if (rc) | |
1079 | + return rc; | |
1080 | + while (!original_security_ops.inode_rmdir) | |
1081 | + smp_rmb(); | |
1082 | + return original_security_ops.inode_rmdir(dir, dentry); | |
1083 | +} | |
1084 | + | |
1085 | +/** | |
1086 | + * ccs_inode_unlink - Check permission for unlink(). | |
1087 | + * | |
1088 | + * @dir: Pointer to "struct inode". | |
1089 | + * @dentry: Pointer to "struct dentry". | |
1090 | + * | |
1091 | + * Returns 0 on success, negative value otherwise. | |
1092 | + */ | |
1093 | +static int ccs_inode_unlink(struct inode *dir, struct dentry *dentry) | |
1094 | +{ | |
1095 | + int rc = ccs_unlink_permission(dentry, NULL); | |
1096 | + if (rc) | |
1097 | + return rc; | |
1098 | + while (!original_security_ops.inode_unlink) | |
1099 | + smp_rmb(); | |
1100 | + return original_security_ops.inode_unlink(dir, dentry); | |
1101 | +} | |
1102 | + | |
1103 | +/** | |
1104 | + * ccs_inode_symlink - Check permission for symlink(). | |
1105 | + * | |
1106 | + * @dir: Pointer to "struct inode". | |
1107 | + * @dentry: Pointer to "struct dentry". | |
1108 | + * @old_name: Content of symbolic link. | |
1109 | + * | |
1110 | + * Returns 0 on success, negative value otherwise. | |
1111 | + */ | |
1112 | +static int ccs_inode_symlink(struct inode *dir, struct dentry *dentry, | |
1113 | + const char *old_name) | |
1114 | +{ | |
1115 | + int rc = ccs_symlink_permission(dentry, NULL, old_name); | |
1116 | + if (rc) | |
1117 | + return rc; | |
1118 | + while (!original_security_ops.inode_symlink) | |
1119 | + smp_rmb(); | |
1120 | + return original_security_ops.inode_symlink(dir, dentry, old_name); | |
1121 | +} | |
1122 | + | |
1123 | +/** | |
1124 | + * ccs_inode_rename - Check permission for rename(). | |
1125 | + * | |
1126 | + * @old_dir: Pointer to "struct inode". | |
1127 | + * @old_dentry: Pointer to "struct dentry". | |
1128 | + * @new_dir: Pointer to "struct inode". | |
1129 | + * @new_dentry: Pointer to "struct dentry". | |
1130 | + * | |
1131 | + * Returns 0 on success, negative value otherwise. | |
1132 | + */ | |
1133 | +static int ccs_inode_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1134 | + struct inode *new_dir, struct dentry *new_dentry) | |
1135 | +{ | |
1136 | + int rc = ccs_rename_permission(old_dentry, new_dentry, NULL); | |
1137 | + if (rc) | |
1138 | + return rc; | |
1139 | + while (!original_security_ops.inode_rename) | |
1140 | + smp_rmb(); | |
1141 | + return original_security_ops.inode_rename(old_dir, old_dentry, new_dir, | |
1142 | + new_dentry); | |
1143 | +} | |
1144 | + | |
1145 | +/** | |
1146 | + * ccs_inode_link - Check permission for link(). | |
1147 | + * | |
1148 | + * @old_dentry: Pointer to "struct dentry". | |
1149 | + * @dir: Pointer to "struct inode". | |
1150 | + * @new_dentry: Pointer to "struct dentry". | |
1151 | + * | |
1152 | + * Returns 0 on success, negative value otherwise. | |
1153 | + */ | |
1154 | +static int ccs_inode_link(struct dentry *old_dentry, struct inode *dir, | |
1155 | + struct dentry *new_dentry) | |
1156 | +{ | |
1157 | + int rc = ccs_link_permission(old_dentry, new_dentry, NULL); | |
1158 | + if (rc) | |
1159 | + return rc; | |
1160 | + while (!original_security_ops.inode_link) | |
1161 | + smp_rmb(); | |
1162 | + return original_security_ops.inode_link(old_dentry, dir, new_dentry); | |
1163 | +} | |
1164 | + | |
1165 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 3, 0) | |
1166 | + | |
1167 | +/** | |
1168 | + * ccs_inode_create - Check permission for creat(). | |
1169 | + * | |
1170 | + * @dir: Pointer to "struct inode". | |
1171 | + * @dentry: Pointer to "struct dentry". | |
1172 | + * @mode: Create mode. | |
1173 | + * | |
1174 | + * Returns 0 on success, negative value otherwise. | |
1175 | + */ | |
1176 | +static int ccs_inode_create(struct inode *dir, struct dentry *dentry, | |
1177 | + umode_t mode) | |
1178 | +{ | |
1179 | + int rc = ccs_mknod_permission(dentry, NULL, mode, 0); | |
1180 | + if (rc) | |
1181 | + return rc; | |
1182 | + while (!original_security_ops.inode_create) | |
1183 | + smp_rmb(); | |
1184 | + return original_security_ops.inode_create(dir, dentry, mode); | |
1185 | +} | |
1186 | + | |
1187 | +#else | |
1188 | + | |
1189 | +/** | |
1190 | + * ccs_inode_create - Check permission for creat(). | |
1191 | + * | |
1192 | + * @dir: Pointer to "struct inode". | |
1193 | + * @dentry: Pointer to "struct dentry". | |
1194 | + * @mode: Create mode. | |
1195 | + * | |
1196 | + * Returns 0 on success, negative value otherwise. | |
1197 | + */ | |
1198 | +static int ccs_inode_create(struct inode *dir, struct dentry *dentry, | |
1199 | + int mode) | |
1200 | +{ | |
1201 | + int rc = ccs_mknod_permission(dentry, NULL, mode, 0); | |
1202 | + if (rc) | |
1203 | + return rc; | |
1204 | + while (!original_security_ops.inode_create) | |
1205 | + smp_rmb(); | |
1206 | + return original_security_ops.inode_create(dir, dentry, mode); | |
1207 | +} | |
1208 | + | |
1209 | +#endif | |
1210 | + | |
1211 | +#endif | |
1212 | + | |
1213 | +#ifdef CONFIG_SECURITY_NETWORK | |
1214 | + | |
1215 | +#include <net/sock.h> | |
1216 | + | |
1217 | +/* Structure for remembering an accept()ed socket's status. */ | |
1218 | +struct ccs_socket_tag { | |
1219 | + struct list_head list; | |
1220 | + struct inode *inode; | |
1221 | + int status; | |
1222 | + struct rcu_head rcu; | |
1223 | +}; | |
1224 | + | |
1225 | +/* | |
1226 | + * List for managing accept()ed sockets. | |
1227 | + * Since we don't need to keep an accept()ed socket into this list after | |
1228 | + * once the permission was granted, the number of entries in this list is | |
1229 | + * likely small. Therefore, we don't use hash tables. | |
1230 | + */ | |
1231 | +static LIST_HEAD(ccs_accepted_socket_list); | |
1232 | +/* Lock for protecting ccs_accepted_socket_list . */ | |
1233 | +static DEFINE_SPINLOCK(ccs_accepted_socket_list_lock); | |
1234 | + | |
1235 | +/** | |
1236 | + * ccs_socket_rcu_free - RCU callback for releasing "struct ccs_socket_tag". | |
1237 | + * | |
1238 | + * @rcu: Pointer to "struct rcu_head". | |
1239 | + * | |
1240 | + * Returns nothing. | |
1241 | + */ | |
1242 | +static void ccs_socket_rcu_free(struct rcu_head *rcu) | |
1243 | +{ | |
1244 | + struct ccs_socket_tag *ptr = container_of(rcu, typeof(*ptr), rcu); | |
1245 | + kfree(ptr); | |
1246 | +} | |
1247 | + | |
1248 | +/** | |
1249 | + * ccs_update_socket_tag - Update tag associated with accept()ed sockets. | |
1250 | + * | |
1251 | + * @inode: Pointer to "struct inode". | |
1252 | + * @status: New status. | |
1253 | + * | |
1254 | + * Returns nothing. | |
1255 | + * | |
1256 | + * If @status == 0, memory for that socket will be released after RCU grace | |
1257 | + * period. | |
1258 | + */ | |
1259 | +static void ccs_update_socket_tag(struct inode *inode, int status) | |
1260 | +{ | |
1261 | + struct ccs_socket_tag *ptr; | |
1262 | + /* | |
1263 | + * Protect whole section because multiple threads may call this | |
1264 | + * function with same "sock" via ccs_validate_socket(). | |
1265 | + */ | |
1266 | + spin_lock(&ccs_accepted_socket_list_lock); | |
1267 | + rcu_read_lock(); | |
1268 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
1269 | + if (ptr->inode != inode) | |
1270 | + continue; | |
1271 | + ptr->status = status; | |
1272 | + if (status) | |
1273 | + break; | |
1274 | + list_del_rcu(&ptr->list); | |
1275 | + call_rcu(&ptr->rcu, ccs_socket_rcu_free); | |
1276 | + break; | |
1277 | + } | |
1278 | + rcu_read_unlock(); | |
1279 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
1280 | +} | |
1281 | + | |
1282 | +/** | |
1283 | + * ccs_validate_socket - Check post accept() permission if needed. | |
1284 | + * | |
1285 | + * @sock: Pointer to "struct socket". | |
1286 | + * | |
1287 | + * Returns 0 on success, negative value otherwise. | |
1288 | + */ | |
1289 | +static int ccs_validate_socket(struct socket *sock) | |
1290 | +{ | |
1291 | + struct inode *inode = SOCK_INODE(sock); | |
1292 | + struct ccs_socket_tag *ptr; | |
1293 | + int ret = 0; | |
1294 | + rcu_read_lock(); | |
1295 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
1296 | + if (ptr->inode != inode) | |
1297 | + continue; | |
1298 | + ret = ptr->status; | |
1299 | + break; | |
1300 | + } | |
1301 | + rcu_read_unlock(); | |
1302 | + if (ret <= 0) | |
1303 | + /* | |
1304 | + * This socket is not an accept()ed socket or this socket is | |
1305 | + * an accept()ed socket and post accept() permission is done. | |
1306 | + */ | |
1307 | + return ret; | |
1308 | + /* | |
1309 | + * Check post accept() permission now. | |
1310 | + * | |
1311 | + * Strictly speaking, we need to pass both listen()ing socket and | |
1312 | + * accept()ed socket to __ccs_socket_post_accept_permission(). | |
1313 | + * But since socket's family and type are same for both sockets, | |
1314 | + * passing the accept()ed socket in place for the listen()ing socket | |
1315 | + * will work. | |
1316 | + */ | |
1317 | + ret = ccs_socket_post_accept_permission(sock, sock); | |
1318 | + /* | |
1319 | + * If permission was granted, we forget that this is an accept()ed | |
1320 | + * socket. Otherwise, we remember that this socket needs to return | |
1321 | + * error for subsequent socketcalls. | |
1322 | + */ | |
1323 | + ccs_update_socket_tag(inode, ret); | |
1324 | + return ret; | |
1325 | +} | |
1326 | + | |
1327 | +/** | |
1328 | + * ccs_socket_accept - Check permission for accept(). | |
1329 | + * | |
1330 | + * @sock: Pointer to "struct socket". | |
1331 | + * @newsock: Pointer to "struct socket". | |
1332 | + * | |
1333 | + * Returns 0 on success, negative value otherwise. | |
1334 | + * | |
1335 | + * This hook is used for setting up environment for doing post accept() | |
1336 | + * permission check. If dereferencing sock->ops->something() were ordered by | |
1337 | + * rcu_dereference(), we could replace sock->ops with "a copy of original | |
1338 | + * sock->ops with modified sock->ops->accept()" using rcu_assign_pointer() | |
1339 | + * in order to do post accept() permission check before returning to userspace. | |
1340 | + * If we make the copy in security_socket_post_create(), it would be possible | |
1341 | + * to safely replace sock->ops here, but we don't do so because we don't want | |
1342 | + * to allocate memory for sockets which do not call sock->ops->accept(). | |
1343 | + * Therefore, we do post accept() permission check upon next socket syscalls | |
1344 | + * rather than between sock->ops->accept() and returning to userspace. | |
1345 | + * This means that if a socket was close()d before calling some socket | |
1346 | + * syscalls, post accept() permission check will not be done. | |
1347 | + */ | |
1348 | +static int ccs_socket_accept(struct socket *sock, struct socket *newsock) | |
1349 | +{ | |
1350 | + struct ccs_socket_tag *ptr; | |
1351 | + int rc = ccs_validate_socket(sock); | |
1352 | + if (rc < 0) | |
1353 | + return rc; | |
1354 | + ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); | |
1355 | + if (!ptr) | |
1356 | + return -ENOMEM; | |
1357 | + while (!original_security_ops.socket_accept) | |
1358 | + smp_rmb(); | |
1359 | + rc = original_security_ops.socket_accept(sock, newsock); | |
1360 | + if (rc) { | |
1361 | + kfree(ptr); | |
1362 | + return rc; | |
1363 | + } | |
1364 | + /* | |
1365 | + * Subsequent LSM hooks will receive "newsock". Therefore, I mark | |
1366 | + * "newsock" as "an accept()ed socket but post accept() permission | |
1367 | + * check is not done yet" by allocating memory using inode of the | |
1368 | + * "newsock" as a search key. | |
1369 | + */ | |
1370 | + ptr->inode = SOCK_INODE(newsock); | |
1371 | + ptr->status = 1; /* Check post accept() permission later. */ | |
1372 | + spin_lock(&ccs_accepted_socket_list_lock); | |
1373 | + list_add_tail_rcu(&ptr->list, &ccs_accepted_socket_list); | |
1374 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
1375 | + return 0; | |
1376 | +} | |
1377 | + | |
1378 | +/** | |
1379 | + * ccs_socket_listen - Check permission for listen(). | |
1380 | + * | |
1381 | + * @sock: Pointer to "struct socket". | |
1382 | + * @backlog: Backlog parameter. | |
1383 | + * | |
1384 | + * Returns 0 on success, negative value otherwise. | |
1385 | + */ | |
1386 | +static int ccs_socket_listen(struct socket *sock, int backlog) | |
1387 | +{ | |
1388 | + int rc = ccs_validate_socket(sock); | |
1389 | + if (rc < 0) | |
1390 | + return rc; | |
1391 | + rc = ccs_socket_listen_permission(sock); | |
1392 | + if (rc) | |
1393 | + return rc; | |
1394 | + while (!original_security_ops.socket_listen) | |
1395 | + smp_rmb(); | |
1396 | + return original_security_ops.socket_listen(sock, backlog); | |
1397 | +} | |
1398 | + | |
1399 | +/** | |
1400 | + * ccs_socket_connect - Check permission for connect(). | |
1401 | + * | |
1402 | + * @sock: Pointer to "struct socket". | |
1403 | + * @addr: Pointer to "struct sockaddr". | |
1404 | + * @addr_len: Size of @addr. | |
1405 | + * | |
1406 | + * Returns 0 on success, negative value otherwise. | |
1407 | + */ | |
1408 | +static int ccs_socket_connect(struct socket *sock, struct sockaddr *addr, | |
1409 | + int addr_len) | |
1410 | +{ | |
1411 | + int rc = ccs_validate_socket(sock); | |
1412 | + if (rc < 0) | |
1413 | + return rc; | |
1414 | + rc = ccs_socket_connect_permission(sock, addr, addr_len); | |
1415 | + if (rc) | |
1416 | + return rc; | |
1417 | + while (!original_security_ops.socket_connect) | |
1418 | + smp_rmb(); | |
1419 | + return original_security_ops.socket_connect(sock, addr, addr_len); | |
1420 | +} | |
1421 | + | |
1422 | +/** | |
1423 | + * ccs_socket_bind - Check permission for bind(). | |
1424 | + * | |
1425 | + * @sock: Pointer to "struct socket". | |
1426 | + * @addr: Pointer to "struct sockaddr". | |
1427 | + * @addr_len: Size of @addr. | |
1428 | + * | |
1429 | + * Returns 0 on success, negative value otherwise. | |
1430 | + */ | |
1431 | +static int ccs_socket_bind(struct socket *sock, struct sockaddr *addr, | |
1432 | + int addr_len) | |
1433 | +{ | |
1434 | + int rc = ccs_validate_socket(sock); | |
1435 | + if (rc < 0) | |
1436 | + return rc; | |
1437 | + rc = ccs_socket_bind_permission(sock, addr, addr_len); | |
1438 | + if (rc) | |
1439 | + return rc; | |
1440 | + while (!original_security_ops.socket_bind) | |
1441 | + smp_rmb(); | |
1442 | + return original_security_ops.socket_bind(sock, addr, addr_len); | |
1443 | +} | |
1444 | + | |
1445 | +/** | |
1446 | + * ccs_socket_sendmsg - Check permission for sendmsg(). | |
1447 | + * | |
1448 | + * @sock: Pointer to "struct socket". | |
1449 | + * @msg: Pointer to "struct msghdr". | |
1450 | + * @size: Size of message. | |
1451 | + * | |
1452 | + * Returns 0 on success, negative value otherwise. | |
1453 | + */ | |
1454 | +static int ccs_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
1455 | + int size) | |
1456 | +{ | |
1457 | + int rc = ccs_validate_socket(sock); | |
1458 | + if (rc < 0) | |
1459 | + return rc; | |
1460 | + rc = ccs_socket_sendmsg_permission(sock, msg, size); | |
1461 | + if (rc) | |
1462 | + return rc; | |
1463 | + while (!original_security_ops.socket_sendmsg) | |
1464 | + smp_rmb(); | |
1465 | + return original_security_ops.socket_sendmsg(sock, msg, size); | |
1466 | +} | |
1467 | + | |
1468 | +/** | |
1469 | + * ccs_socket_recvmsg - Check permission for recvmsg(). | |
1470 | + * | |
1471 | + * @sock: Pointer to "struct socket". | |
1472 | + * @msg: Pointer to "struct msghdr". | |
1473 | + * @size: Size of message. | |
1474 | + * @flags: Flags. | |
1475 | + * | |
1476 | + * Returns 0 on success, negative value otherwise. | |
1477 | + */ | |
1478 | +static int ccs_socket_recvmsg(struct socket *sock, struct msghdr *msg, | |
1479 | + int size, int flags) | |
1480 | +{ | |
1481 | + int rc = ccs_validate_socket(sock); | |
1482 | + if (rc < 0) | |
1483 | + return rc; | |
1484 | + while (!original_security_ops.socket_recvmsg) | |
1485 | + smp_rmb(); | |
1486 | + return original_security_ops.socket_recvmsg(sock, msg, size, flags); | |
1487 | +} | |
1488 | + | |
1489 | +/** | |
1490 | + * ccs_socket_getsockname - Check permission for getsockname(). | |
1491 | + * | |
1492 | + * @sock: Pointer to "struct socket". | |
1493 | + * | |
1494 | + * Returns 0 on success, negative value otherwise. | |
1495 | + */ | |
1496 | +static int ccs_socket_getsockname(struct socket *sock) | |
1497 | +{ | |
1498 | + int rc = ccs_validate_socket(sock); | |
1499 | + if (rc < 0) | |
1500 | + return rc; | |
1501 | + while (!original_security_ops.socket_getsockname) | |
1502 | + smp_rmb(); | |
1503 | + return original_security_ops.socket_getsockname(sock); | |
1504 | +} | |
1505 | + | |
1506 | +/** | |
1507 | + * ccs_socket_getpeername - Check permission for getpeername(). | |
1508 | + * | |
1509 | + * @sock: Pointer to "struct socket". | |
1510 | + * | |
1511 | + * Returns 0 on success, negative value otherwise. | |
1512 | + */ | |
1513 | +static int ccs_socket_getpeername(struct socket *sock) | |
1514 | +{ | |
1515 | + int rc = ccs_validate_socket(sock); | |
1516 | + if (rc < 0) | |
1517 | + return rc; | |
1518 | + while (!original_security_ops.socket_getpeername) | |
1519 | + smp_rmb(); | |
1520 | + return original_security_ops.socket_getpeername(sock); | |
1521 | +} | |
1522 | + | |
1523 | +/** | |
1524 | + * ccs_socket_getsockopt - Check permission for getsockopt(). | |
1525 | + * | |
1526 | + * @sock: Pointer to "struct socket". | |
1527 | + * @level: Level. | |
1528 | + * @optname: Option's name, | |
1529 | + * | |
1530 | + * Returns 0 on success, negative value otherwise. | |
1531 | + */ | |
1532 | +static int ccs_socket_getsockopt(struct socket *sock, int level, int optname) | |
1533 | +{ | |
1534 | + int rc = ccs_validate_socket(sock); | |
1535 | + if (rc < 0) | |
1536 | + return rc; | |
1537 | + while (!original_security_ops.socket_getsockopt) | |
1538 | + smp_rmb(); | |
1539 | + return original_security_ops.socket_getsockopt(sock, level, optname); | |
1540 | +} | |
1541 | + | |
1542 | +/** | |
1543 | + * ccs_socket_setsockopt - Check permission for setsockopt(). | |
1544 | + * | |
1545 | + * @sock: Pointer to "struct socket". | |
1546 | + * @level: Level. | |
1547 | + * @optname: Option's name, | |
1548 | + * | |
1549 | + * Returns 0 on success, negative value otherwise. | |
1550 | + */ | |
1551 | +static int ccs_socket_setsockopt(struct socket *sock, int level, int optname) | |
1552 | +{ | |
1553 | + int rc = ccs_validate_socket(sock); | |
1554 | + if (rc < 0) | |
1555 | + return rc; | |
1556 | + while (!original_security_ops.socket_setsockopt) | |
1557 | + smp_rmb(); | |
1558 | + return original_security_ops.socket_setsockopt(sock, level, optname); | |
1559 | +} | |
1560 | + | |
1561 | +/** | |
1562 | + * ccs_socket_shutdown - Check permission for shutdown(). | |
1563 | + * | |
1564 | + * @sock: Pointer to "struct socket". | |
1565 | + * @how: Shutdown mode. | |
1566 | + * | |
1567 | + * Returns 0 on success, negative value otherwise. | |
1568 | + */ | |
1569 | +static int ccs_socket_shutdown(struct socket *sock, int how) | |
1570 | +{ | |
1571 | + int rc = ccs_validate_socket(sock); | |
1572 | + if (rc < 0) | |
1573 | + return rc; | |
1574 | + while (!original_security_ops.socket_shutdown) | |
1575 | + smp_rmb(); | |
1576 | + return original_security_ops.socket_shutdown(sock, how); | |
1577 | +} | |
1578 | + | |
1579 | +#define SOCKFS_MAGIC 0x534F434B | |
1580 | + | |
1581 | +/** | |
1582 | + * ccs_inode_free_security - Release memory associated with an inode. | |
1583 | + * | |
1584 | + * @inode: Pointer to "struct inode". | |
1585 | + * | |
1586 | + * Returns nothing. | |
1587 | + * | |
1588 | + * We use this hook for releasing memory associated with an accept()ed socket. | |
1589 | + */ | |
1590 | +static void ccs_inode_free_security(struct inode *inode) | |
1591 | +{ | |
1592 | + while (!original_security_ops.inode_free_security) | |
1593 | + smp_rmb(); | |
1594 | + original_security_ops.inode_free_security(inode); | |
1595 | + if (inode->i_sb && inode->i_sb->s_magic == SOCKFS_MAGIC) | |
1596 | + ccs_update_socket_tag(inode, 0); | |
1597 | +} | |
1598 | + | |
1599 | +#endif | |
1600 | + | |
1601 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 7, 0) | |
1602 | + | |
1603 | +/** | |
1604 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
1605 | + * | |
1606 | + * @old_path: Pointer to "struct path". | |
1607 | + * @new_path: Pointer to "struct path". | |
1608 | + * | |
1609 | + * Returns 0 on success, negative value otherwise. | |
1610 | + */ | |
1611 | +static int ccs_sb_pivotroot(struct path *old_path, struct path *new_path) | |
1612 | +{ | |
1613 | + int rc = ccs_pivot_root_permission(old_path, new_path); | |
1614 | + if (rc) | |
1615 | + return rc; | |
1616 | + while (!original_security_ops.sb_pivotroot) | |
1617 | + smp_rmb(); | |
1618 | + return original_security_ops.sb_pivotroot(old_path, new_path); | |
1619 | +} | |
1620 | + | |
1621 | +/** | |
1622 | + * ccs_sb_mount - Check permission for mount(). | |
1623 | + * | |
1624 | + * @dev_name: Name of device file. | |
1625 | + * @path: Pointer to "struct path". | |
1626 | + * @type: Name of filesystem type. Maybe NULL. | |
1627 | + * @flags: Mount options. | |
1628 | + * @data_page: Optional data. Maybe NULL. | |
1629 | + * | |
1630 | + * Returns 0 on success, negative value otherwise. | |
1631 | + */ | |
1632 | +static int ccs_sb_mount(char *dev_name, struct path *path, char *type, | |
1633 | + unsigned long flags, void *data_page) | |
1634 | +{ | |
1635 | + int rc = ccs_mount_permission(dev_name, path, type, flags, data_page); | |
1636 | + if (rc) | |
1637 | + return rc; | |
1638 | + while (!original_security_ops.sb_mount) | |
1639 | + smp_rmb(); | |
1640 | + return original_security_ops.sb_mount(dev_name, path, type, flags, | |
1641 | + data_page); | |
1642 | +} | |
1643 | + | |
1644 | +#else | |
1645 | + | |
1646 | +/** | |
1647 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
1648 | + * | |
1649 | + * @old_path: Pointer to "struct path". | |
1650 | + * @new_path: Pointer to "struct path". | |
1651 | + * | |
1652 | + * Returns 0 on success, negative value otherwise. | |
1653 | + */ | |
1654 | +static int ccs_sb_pivotroot(struct path *old_path, struct path *new_path) | |
1655 | +{ | |
1656 | + int rc = ccs_pivot_root_permission(old_path, new_path); | |
1657 | + if (rc) | |
1658 | + return rc; | |
1659 | + while (!original_security_ops.sb_pivotroot) | |
1660 | + smp_rmb(); | |
1661 | + return original_security_ops.sb_pivotroot(old_path, new_path); | |
1662 | +} | |
1663 | + | |
1664 | +/** | |
1665 | + * ccs_sb_mount - Check permission for mount(). | |
1666 | + * | |
1667 | + * @dev_name: Name of device file. | |
1668 | + * @path: Pointer to "struct path". | |
1669 | + * @type: Name of filesystem type. Maybe NULL. | |
1670 | + * @flags: Mount options. | |
1671 | + * @data_page: Optional data. Maybe NULL. | |
1672 | + * | |
1673 | + * Returns 0 on success, negative value otherwise. | |
1674 | + */ | |
1675 | +static int ccs_sb_mount(const char *dev_name, struct path *path, | |
1676 | + const char *type, unsigned long flags, void *data_page) | |
1677 | +{ | |
1678 | + int rc = ccs_mount_permission(dev_name, path, type, flags, data_page); | |
1679 | + if (rc) | |
1680 | + return rc; | |
1681 | + while (!original_security_ops.sb_mount) | |
1682 | + smp_rmb(); | |
1683 | + return original_security_ops.sb_mount(dev_name, path, type, flags, | |
1684 | + data_page); | |
1685 | +} | |
1686 | + | |
1687 | +#endif | |
1688 | + | |
1689 | +/** | |
1690 | + * ccs_sb_umount - Check permission for umount(). | |
1691 | + * | |
1692 | + * @mnt: Pointer to "struct vfsmount". | |
1693 | + * @flags: Unmount flags. | |
1694 | + * | |
1695 | + * Returns 0 on success, negative value otherwise. | |
1696 | + */ | |
1697 | +static int ccs_sb_umount(struct vfsmount *mnt, int flags) | |
1698 | +{ | |
1699 | + int rc = ccs_umount_permission(mnt, flags); | |
1700 | + if (rc) | |
1701 | + return rc; | |
1702 | + while (!original_security_ops.sb_umount) | |
1703 | + smp_rmb(); | |
1704 | + return original_security_ops.sb_umount(mnt, flags); | |
1705 | +} | |
1706 | + | |
1707 | +/** | |
1708 | + * ccs_file_fcntl - Check permission for fcntl(). | |
1709 | + * | |
1710 | + * @file: Pointer to "struct file". | |
1711 | + * @cmd: Command number. | |
1712 | + * @arg: Value for @cmd. | |
1713 | + * | |
1714 | + * Returns 0 on success, negative value otherwise. | |
1715 | + */ | |
1716 | +static int ccs_file_fcntl(struct file *file, unsigned int cmd, | |
1717 | + unsigned long arg) | |
1718 | +{ | |
1719 | + int rc = ccs_fcntl_permission(file, cmd, arg); | |
1720 | + if (rc) | |
1721 | + return rc; | |
1722 | + while (!original_security_ops.file_fcntl) | |
1723 | + smp_rmb(); | |
1724 | + return original_security_ops.file_fcntl(file, cmd, arg); | |
1725 | +} | |
1726 | + | |
1727 | +/** | |
1728 | + * ccs_file_ioctl - Check permission for ioctl(). | |
1729 | + * | |
1730 | + * @filp: Pointer to "struct file". | |
1731 | + * @cmd: Command number. | |
1732 | + * @arg: Value for @cmd. | |
1733 | + * | |
1734 | + * Returns 0 on success, negative value otherwise. | |
1735 | + */ | |
1736 | +static int ccs_file_ioctl(struct file *filp, unsigned int cmd, | |
1737 | + unsigned long arg) | |
1738 | +{ | |
1739 | + int rc = ccs_ioctl_permission(filp, cmd, arg); | |
1740 | + if (rc) | |
1741 | + return rc; | |
1742 | + while (!original_security_ops.file_ioctl) | |
1743 | + smp_rmb(); | |
1744 | + return original_security_ops.file_ioctl(filp, cmd, arg); | |
1745 | +} | |
1746 | + | |
1747 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33) && defined(CONFIG_SYSCTL_SYSCALL) | |
1748 | +int ccs_path_permission(struct ccs_request_info *r, u8 operation, | |
1749 | + const struct ccs_path_info *filename); | |
1750 | + | |
1751 | +/** | |
1752 | + * ccs_prepend - Copy of prepend() in fs/dcache.c. | |
1753 | + * | |
1754 | + * @buffer: Pointer to "struct char *". | |
1755 | + * @buflen: Pointer to int which holds size of @buffer. | |
1756 | + * @str: String to copy. | |
1757 | + * | |
1758 | + * Returns 0 on success, negative value otherwise. | |
1759 | + * | |
1760 | + * @buffer and @buflen are updated upon success. | |
1761 | + */ | |
1762 | +static int ccs_prepend(char **buffer, int *buflen, const char *str) | |
1763 | +{ | |
1764 | + int namelen = strlen(str); | |
1765 | + if (*buflen < namelen) | |
1766 | + return -ENOMEM; | |
1767 | + *buflen -= namelen; | |
1768 | + *buffer -= namelen; | |
1769 | + memcpy(*buffer, str, namelen); | |
1770 | + return 0; | |
1771 | +} | |
1772 | + | |
1773 | +/** | |
1774 | + * ccs_sysctl_permission - Check permission for sysctl(). | |
1775 | + * | |
1776 | + * @table: Pointer to "struct ctl_table". | |
1777 | + * @op: Operation. (MAY_READ and/or MAY_WRITE) | |
1778 | + * | |
1779 | + * Returns 0 on success, negative value otherwise. | |
1780 | + */ | |
1781 | +static int ccs_sysctl(struct ctl_table *table, int op) | |
1782 | +{ | |
1783 | + int error; | |
1784 | + struct ccs_path_info buf; | |
1785 | + struct ccs_request_info r; | |
1786 | + int buflen; | |
1787 | + char *buffer; | |
1788 | + int idx; | |
1789 | + while (!original_security_ops.sysctl) | |
1790 | + smp_rmb(); | |
1791 | + error = original_security_ops.sysctl(table, op); | |
1792 | + if (error) | |
1793 | + return error; | |
1794 | + op &= MAY_READ | MAY_WRITE; | |
1795 | + if (!op) | |
1796 | + return 0; | |
1797 | + buffer = NULL; | |
1798 | + buf.name = NULL; | |
1799 | + idx = ccs_read_lock(); | |
1800 | + if (ccs_init_request_info(&r, CCS_MAC_FILE_OPEN) | |
1801 | + == CCS_CONFIG_DISABLED) | |
1802 | + goto out; | |
1803 | + error = -ENOMEM; | |
1804 | + buflen = 4096; | |
1805 | + buffer = kmalloc(buflen, CCS_GFP_FLAGS); | |
1806 | + if (buffer) { | |
1807 | + char *end = buffer + buflen; | |
1808 | + *--end = '\0'; | |
1809 | + buflen--; | |
1810 | + while (table) { | |
1811 | + char num[32]; | |
1812 | + const char *sp = table->procname; | |
1813 | + if (!sp) { | |
1814 | + memset(num, 0, sizeof(num)); | |
1815 | + snprintf(num, sizeof(num) - 1, "=%d=", | |
1816 | + table->ctl_name); | |
1817 | + sp = num; | |
1818 | + } | |
1819 | + if (ccs_prepend(&end, &buflen, sp) || | |
1820 | + ccs_prepend(&end, &buflen, "/")) | |
1821 | + goto out; | |
1822 | + table = table->parent; | |
1823 | + } | |
1824 | + if (ccs_prepend(&end, &buflen, "proc:/sys")) | |
1825 | + goto out; | |
1826 | + buf.name = ccs_encode(end); | |
1827 | + } | |
1828 | + if (buf.name) { | |
1829 | + ccs_fill_path_info(&buf); | |
1830 | + if (op & MAY_READ) | |
1831 | + error = ccs_path_permission(&r, CCS_TYPE_READ, &buf); | |
1832 | + else | |
1833 | + error = 0; | |
1834 | + if (!error && (op & MAY_WRITE)) | |
1835 | + error = ccs_path_permission(&r, CCS_TYPE_WRITE, &buf); | |
1836 | + } | |
1837 | +out: | |
1838 | + ccs_read_unlock(idx); | |
1839 | + kfree(buf.name); | |
1840 | + kfree(buffer); | |
1841 | + return error; | |
1842 | +} | |
1843 | + | |
1844 | +#endif | |
1845 | + | |
1846 | +/* | |
1847 | + * Why not to copy all operations by "original_security_ops = *ops" ? | |
1848 | + * Because copying byte array is not atomic. Reader checks | |
1849 | + * original_security_ops.op != NULL before doing original_security_ops.op(). | |
1850 | + * Thus, modifying original_security_ops.op has to be atomic. | |
1851 | + */ | |
1852 | +#define swap_security_ops(op) \ | |
1853 | + original_security_ops.op = ops->op; smp_wmb(); ops->op = ccs_##op; | |
1854 | + | |
1855 | +/** | |
1856 | + * ccs_update_security_ops - Overwrite original "struct security_operations". | |
1857 | + * | |
1858 | + * @ops: Pointer to "struct security_operations". | |
1859 | + * | |
1860 | + * Returns nothing. | |
1861 | + */ | |
1862 | +static void __init ccs_update_security_ops(struct security_operations *ops) | |
1863 | +{ | |
1864 | + /* Security context allocator. */ | |
1865 | + swap_security_ops(task_create); | |
1866 | + swap_security_ops(cred_prepare); | |
1867 | + swap_security_ops(cred_free); | |
1868 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 32) | |
1869 | + swap_security_ops(cred_alloc_blank); | |
1870 | + swap_security_ops(cred_transfer); | |
1871 | +#endif | |
1872 | + /* Security context updater for successful execve(). */ | |
1873 | + swap_security_ops(bprm_check_security); | |
1874 | + swap_security_ops(bprm_committing_creds); | |
1875 | + /* Various permission checker. */ | |
1876 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
1877 | + swap_security_ops(file_open); | |
1878 | +#else | |
1879 | + swap_security_ops(dentry_open); | |
1880 | +#endif | |
1881 | + swap_security_ops(file_fcntl); | |
1882 | + swap_security_ops(file_ioctl); | |
1883 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33) && defined(CONFIG_SYSCTL_SYSCALL) | |
1884 | + swap_security_ops(sysctl); | |
1885 | +#endif | |
1886 | + swap_security_ops(sb_pivotroot); | |
1887 | + swap_security_ops(sb_mount); | |
1888 | + swap_security_ops(sb_umount); | |
1889 | +#if defined(CONFIG_SECURITY_PATH) | |
1890 | + swap_security_ops(path_mknod); | |
1891 | + swap_security_ops(path_mkdir); | |
1892 | + swap_security_ops(path_rmdir); | |
1893 | + swap_security_ops(path_unlink); | |
1894 | + swap_security_ops(path_symlink); | |
1895 | + swap_security_ops(path_rename); | |
1896 | + swap_security_ops(path_link); | |
1897 | + swap_security_ops(path_truncate); | |
1898 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) | |
1899 | + swap_security_ops(path_chmod); | |
1900 | + swap_security_ops(path_chown); | |
1901 | + swap_security_ops(path_chroot); | |
1902 | +#endif | |
1903 | +#else | |
1904 | + swap_security_ops(inode_mknod); | |
1905 | + swap_security_ops(inode_mkdir); | |
1906 | + swap_security_ops(inode_rmdir); | |
1907 | + swap_security_ops(inode_unlink); | |
1908 | + swap_security_ops(inode_symlink); | |
1909 | + swap_security_ops(inode_rename); | |
1910 | + swap_security_ops(inode_link); | |
1911 | + swap_security_ops(inode_create); | |
1912 | +#endif | |
1913 | + swap_security_ops(inode_setattr); | |
1914 | + swap_security_ops(inode_getattr); | |
1915 | +#ifdef CONFIG_SECURITY_NETWORK | |
1916 | + swap_security_ops(socket_bind); | |
1917 | + swap_security_ops(socket_connect); | |
1918 | + swap_security_ops(socket_listen); | |
1919 | + swap_security_ops(socket_sendmsg); | |
1920 | + swap_security_ops(socket_recvmsg); | |
1921 | + swap_security_ops(socket_getsockname); | |
1922 | + swap_security_ops(socket_getpeername); | |
1923 | + swap_security_ops(socket_getsockopt); | |
1924 | + swap_security_ops(socket_setsockopt); | |
1925 | + swap_security_ops(socket_shutdown); | |
1926 | + swap_security_ops(socket_accept); | |
1927 | + swap_security_ops(inode_free_security); | |
1928 | +#endif | |
1929 | +} | |
1930 | + | |
1931 | +#undef swap_security_ops | |
1932 | + | |
1933 | +/** | |
1934 | + * ccs_init - Initialize this module. | |
1935 | + * | |
1936 | + * Returns 0 on success, negative value otherwise. | |
1937 | + */ | |
1938 | +static int __init ccs_init(void) | |
1939 | +{ | |
1940 | + struct security_operations *ops = probe_security_ops(); | |
1941 | + if (!ops) | |
1942 | + goto out; | |
1943 | + ccsecurity_exports.find_task_by_vpid = probe_find_task_by_vpid(); | |
1944 | + if (!ccsecurity_exports.find_task_by_vpid) | |
1945 | + goto out; | |
1946 | + ccsecurity_exports.find_task_by_pid_ns = probe_find_task_by_pid_ns(); | |
1947 | + if (!ccsecurity_exports.find_task_by_pid_ns) | |
1948 | + goto out; | |
1949 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36) | |
1950 | + ccsecurity_exports.vfsmount_lock = probe_vfsmount_lock(); | |
1951 | + if (!ccsecurity_exports.vfsmount_lock) | |
1952 | + goto out; | |
1953 | +#elif LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0) | |
1954 | + ccsecurity_exports.__d_path = probe___d_path(); | |
1955 | + if (!ccsecurity_exports.__d_path) | |
1956 | + goto out; | |
1957 | +#else | |
1958 | + ccsecurity_exports.d_absolute_path = probe_d_absolute_path(); | |
1959 | + if (!ccsecurity_exports.d_absolute_path) | |
1960 | + goto out; | |
1961 | +#endif | |
1962 | + { | |
1963 | + int idx; | |
1964 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) { | |
1965 | + INIT_LIST_HEAD(&ccs_cred_security_list[idx]); | |
1966 | + INIT_LIST_HEAD(&ccs_task_security_list[idx]); | |
1967 | + } | |
1968 | + } | |
1969 | + ccs_main_init(); | |
1970 | + ccs_update_security_ops(ops); | |
1971 | + printk(KERN_INFO "AKARI: 1.0.39 2019/08/20\n"); | |
1972 | + printk(KERN_INFO | |
1973 | + "Access Keeping And Regulating Instrument registered.\n"); | |
1974 | + return 0; | |
1975 | +out: | |
1976 | + return -EINVAL; | |
1977 | +} | |
1978 | + | |
1979 | +module_init(ccs_init); | |
1980 | +MODULE_LICENSE("GPL"); | |
1981 | + | |
1982 | +/** | |
1983 | + * ccs_used_by_cred - Check whether the given domain is in use or not. | |
1984 | + * | |
1985 | + * @domain: Pointer to "struct ccs_domain_info". | |
1986 | + * | |
1987 | + * Returns true if @domain is in use, false otherwise. | |
1988 | + * | |
1989 | + * Caller holds rcu_read_lock(). | |
1990 | + */ | |
1991 | +bool ccs_used_by_cred(const struct ccs_domain_info *domain) | |
1992 | +{ | |
1993 | + int idx; | |
1994 | + struct ccs_security *ptr; | |
1995 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) { | |
1996 | + struct list_head *list = &ccs_cred_security_list[idx]; | |
1997 | + list_for_each_entry_rcu(ptr, list, list) { | |
1998 | + struct ccs_execve *ee = ptr->ee; | |
1999 | + if (ptr->ccs_domain_info == domain || | |
2000 | + (ee && ee->previous_domain == domain)) { | |
2001 | + return true; | |
2002 | + } | |
2003 | + } | |
2004 | + } | |
2005 | + return false; | |
2006 | +} | |
2007 | + | |
2008 | +/** | |
2009 | + * ccs_add_task_security - Add "struct ccs_security" to list. | |
2010 | + * | |
2011 | + * @ptr: Pointer to "struct ccs_security". | |
2012 | + * @list: Pointer to "struct list_head". | |
2013 | + * | |
2014 | + * Returns nothing. | |
2015 | + */ | |
2016 | +static void ccs_add_task_security(struct ccs_security *ptr, | |
2017 | + struct list_head *list) | |
2018 | +{ | |
2019 | + unsigned long flags; | |
2020 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
2021 | + list_add_rcu(&ptr->list, list); | |
2022 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
2023 | +} | |
2024 | + | |
2025 | +/** | |
2026 | + * ccs_find_task_security - Find "struct ccs_security" for given task. | |
2027 | + * | |
2028 | + * @task: Pointer to "struct task_struct". | |
2029 | + * | |
2030 | + * Returns pointer to "struct ccs_security" on success, &ccs_oom_security on | |
2031 | + * out of memory, &ccs_default_security otherwise. | |
2032 | + * | |
2033 | + * If @task is current thread and "struct ccs_security" for current thread was | |
2034 | + * not found, I try to allocate it. But if allocation failed, current thread | |
2035 | + * will be killed by SIGKILL. Note that if current->pid == 1, sending SIGKILL | |
2036 | + * won't work. | |
2037 | + */ | |
2038 | +struct ccs_security *ccs_find_task_security(const struct task_struct *task) | |
2039 | +{ | |
2040 | + struct ccs_security *ptr; | |
2041 | + struct list_head *list = &ccs_task_security_list | |
2042 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
2043 | + /* Make sure INIT_LIST_HEAD() in ccs_mm_init() takes effect. */ | |
2044 | + while (!list->next) | |
2045 | + smp_rmb(); | |
2046 | + rcu_read_lock(); | |
2047 | + list_for_each_entry_rcu(ptr, list, list) { | |
2048 | + if (ptr->pid != task->pids[PIDTYPE_PID].pid) | |
2049 | + continue; | |
2050 | + rcu_read_unlock(); | |
2051 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31) | |
2052 | + /* | |
2053 | + * Current thread needs to transit from old domain to new | |
2054 | + * domain before do_execve() succeeds in order to check | |
2055 | + * permission for interpreters and environment variables using | |
2056 | + * new domain's ACL rules. The domain transition has to be | |
2057 | + * visible from other CPU in order to allow interactive | |
2058 | + * enforcing mode. Also, the domain transition has to be | |
2059 | + * reverted if do_execve() failed. However, an LSM hook for | |
2060 | + * reverting domain transition is missing. | |
2061 | + * | |
2062 | + * security_prepare_creds() is called from prepare_creds() from | |
2063 | + * prepare_bprm_creds() from do_execve() before setting | |
2064 | + * current->in_execve flag, and current->in_execve flag is | |
2065 | + * cleared by the time next do_execve() request starts. | |
2066 | + * This means that we can emulate the missing LSM hook for | |
2067 | + * reverting domain transition, by calling this function from | |
2068 | + * security_prepare_creds(). | |
2069 | + * | |
2070 | + * If current->in_execve is not set but ptr->ccs_flags has | |
2071 | + * CCS_TASK_IS_IN_EXECVE set, it indicates that do_execve() | |
2072 | + * has failed and reverting domain transition is needed. | |
2073 | + */ | |
2074 | + if (task == current && | |
2075 | + (ptr->ccs_flags & CCS_TASK_IS_IN_EXECVE) && | |
2076 | + !current->in_execve) { | |
2077 | + ccs_debug_trace("4"); | |
2078 | + ccs_clear_execve(-1, ptr); | |
2079 | + } | |
2080 | +#else | |
2081 | + /* | |
2082 | + * Current thread needs to transit from old domain to new | |
2083 | + * domain before do_execve() succeeds in order to check | |
2084 | + * permission for interpreters and environment variables using | |
2085 | + * new domain's ACL rules. The domain transition has to be | |
2086 | + * visible from other CPU in order to allow interactive | |
2087 | + * enforcing mode. Also, the domain transition has to be | |
2088 | + * reverted if do_execve() failed. However, an LSM hook for | |
2089 | + * reverting domain transition is missing. | |
2090 | + * | |
2091 | + * When do_execve() failed, "struct cred" in | |
2092 | + * "struct linux_binprm" is scheduled for destruction. | |
2093 | + * But current thread returns to userspace without waiting for | |
2094 | + * destruction. The security_cred_free() LSM hook is called | |
2095 | + * after an RCU grace period has elapsed. Since some CPU may be | |
2096 | + * doing long long RCU read side critical section, there is | |
2097 | + * no guarantee that security_cred_free() is called before | |
2098 | + * current thread again calls do_execve(). | |
2099 | + * | |
2100 | + * To be able to revert domain transition before processing | |
2101 | + * next do_execve() request, current thread gets a refcount on | |
2102 | + * "struct cred" in "struct linux_binprm" and memorizes it. | |
2103 | + * Current thread drops the refcount and forgets it when | |
2104 | + * do_execve() succeeded. | |
2105 | + * | |
2106 | + * Therefore, if current thread hasn't forgotten it and | |
2107 | + * current thread is the last one using that "struct cred", | |
2108 | + * it indicates that do_execve() has failed and reverting | |
2109 | + * domain transition is needed. | |
2110 | + */ | |
2111 | + if (task == current && ptr->cred && | |
2112 | + atomic_read(&ptr->cred->usage) == 1) { | |
2113 | + ccs_debug_trace("4"); | |
2114 | + ccs_clear_execve(-1, ptr); | |
2115 | + } | |
2116 | +#endif | |
2117 | + return ptr; | |
2118 | + } | |
2119 | + rcu_read_unlock(); | |
2120 | + if (task != current) { | |
2121 | + /* | |
2122 | + * If a thread does nothing after fork(), caller will reach | |
2123 | + * here because "struct ccs_security" for that thread is not | |
2124 | + * yet allocated. But that thread is keeping a snapshot of | |
2125 | + * "struct ccs_security" taken as of ccs_task_create() | |
2126 | + * associated with that thread's "struct cred". | |
2127 | + * | |
2128 | + * Since that snapshot will be used as initial data when that | |
2129 | + * thread allocates "struct ccs_security" for that thread, we | |
2130 | + * can return that snapshot rather than &ccs_default_security. | |
2131 | + * | |
2132 | + * Since this function is called by only ccs_select_one() and | |
2133 | + * ccs_read_pid() (via ccs_task_domain() and ccs_task_flags()), | |
2134 | + * it is guaranteed that caller has called rcu_read_lock() | |
2135 | + * (via ccs_tasklist_lock()) before finding this thread and | |
2136 | + * this thread is valid. Therefore, we can do __task_cred(task) | |
2137 | + * like get_robust_list() does. | |
2138 | + */ | |
2139 | + return ccs_find_cred_security(__task_cred(task)); | |
2140 | + } | |
2141 | + /* Use GFP_ATOMIC because caller may have called rcu_read_lock(). */ | |
2142 | + ptr = kzalloc(sizeof(*ptr), GFP_ATOMIC); | |
2143 | + if (!ptr) { | |
2144 | + printk(KERN_WARNING "Unable to allocate memory for pid=%u\n", | |
2145 | + task->pid); | |
2146 | + send_sig(SIGKILL, current, 0); | |
2147 | + return &ccs_oom_security; | |
2148 | + } | |
2149 | + *ptr = *ccs_find_cred_security(task->cred); | |
2150 | + /* We can shortcut because task == current. */ | |
2151 | + ptr->pid = get_pid(((struct task_struct *) task)-> | |
2152 | + pids[PIDTYPE_PID].pid); | |
2153 | + ptr->cred = NULL; | |
2154 | + ccs_add_task_security(ptr, list); | |
2155 | + return ptr; | |
2156 | +} | |
2157 | + | |
2158 | +/** | |
2159 | + * ccs_copy_cred_security - Allocate memory for new credentials. | |
2160 | + * | |
2161 | + * @new: Pointer to "struct cred". | |
2162 | + * @old: Pointer to "struct cred". | |
2163 | + * @gfp: Memory allocation flags. | |
2164 | + * | |
2165 | + * Returns 0 on success, negative value otherwise. | |
2166 | + */ | |
2167 | +static int ccs_copy_cred_security(const struct cred *new, | |
2168 | + const struct cred *old, gfp_t gfp) | |
2169 | +{ | |
2170 | + struct ccs_security *old_security = ccs_find_cred_security(old); | |
2171 | + struct ccs_security *new_security = | |
2172 | + kzalloc(sizeof(*new_security), gfp); | |
2173 | + if (!new_security) | |
2174 | + return -ENOMEM; | |
2175 | + *new_security = *old_security; | |
2176 | + new_security->cred = new; | |
2177 | + ccs_add_cred_security(new_security); | |
2178 | + return 0; | |
2179 | +} | |
2180 | + | |
2181 | +/** | |
2182 | + * ccs_find_cred_security - Find "struct ccs_security" for given credential. | |
2183 | + * | |
2184 | + * @cred: Pointer to "struct cred". | |
2185 | + * | |
2186 | + * Returns pointer to "struct ccs_security" on success, &ccs_default_security | |
2187 | + * otherwise. | |
2188 | + */ | |
2189 | +static struct ccs_security *ccs_find_cred_security(const struct cred *cred) | |
2190 | +{ | |
2191 | + struct ccs_security *ptr; | |
2192 | + struct list_head *list = &ccs_cred_security_list | |
2193 | + [hash_ptr((void *) cred, CCS_TASK_SECURITY_HASH_BITS)]; | |
2194 | + rcu_read_lock(); | |
2195 | + list_for_each_entry_rcu(ptr, list, list) { | |
2196 | + if (ptr->cred != cred) | |
2197 | + continue; | |
2198 | + rcu_read_unlock(); | |
2199 | + return ptr; | |
2200 | + } | |
2201 | + rcu_read_unlock(); | |
2202 | + return &ccs_default_security; | |
2203 | +} | |
2204 | + | |
2205 | +/** | |
2206 | + * ccs_task_security_gc - Do garbage collection for "struct task_struct". | |
2207 | + * | |
2208 | + * Returns nothing. | |
2209 | + * | |
2210 | + * Since security_task_free() is missing, I can't release memory associated | |
2211 | + * with "struct task_struct" when a task dies. Therefore, I hold a reference on | |
2212 | + * "struct pid" and runs garbage collection when associated | |
2213 | + * "struct task_struct" has gone. | |
2214 | + */ | |
2215 | +static void ccs_task_security_gc(void) | |
2216 | +{ | |
2217 | + static DEFINE_SPINLOCK(lock); | |
2218 | + static atomic_t gc_counter = ATOMIC_INIT(0); | |
2219 | + unsigned int idx; | |
2220 | + /* | |
2221 | + * If some process is doing execve(), try to garbage collection now. | |
2222 | + * We should kfree() memory associated with "struct ccs_security"->ee | |
2223 | + * as soon as execve() has completed in order to compensate for lack of | |
2224 | + * security_bprm_free() and security_task_free() hooks. | |
2225 | + * | |
2226 | + * Otherwise, reduce frequency for performance reason. | |
2227 | + */ | |
2228 | + if (!atomic_read(&ccs_in_execve_tasks) && | |
2229 | + atomic_inc_return(&gc_counter) < 1024) | |
2230 | + return; | |
2231 | + if (!spin_trylock(&lock)) | |
2232 | + return; | |
2233 | + atomic_set(&gc_counter, 0); | |
2234 | + rcu_read_lock(); | |
2235 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) { | |
2236 | + struct ccs_security *ptr; | |
2237 | + struct list_head *list = &ccs_task_security_list[idx]; | |
2238 | + list_for_each_entry_rcu(ptr, list, list) { | |
2239 | + if (pid_task(ptr->pid, PIDTYPE_PID)) | |
2240 | + continue; | |
2241 | + ccs_del_security(ptr); | |
2242 | + } | |
2243 | + } | |
2244 | + rcu_read_unlock(); | |
2245 | + spin_unlock(&lock); | |
2246 | +} |
@@ -0,0 +1,1376 @@ | ||
1 | +/* | |
2 | + * lsm.c | |
3 | + * | |
4 | + * Copyright (C) 2010-2015 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | |
5 | + * | |
6 | + * Version: 1.0.39 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include "internal.h" | |
10 | +#include "probe.h" | |
11 | + | |
12 | +/* Prototype definition. */ | |
13 | +static int __ccs_alloc_task_security(const struct task_struct *task); | |
14 | +static void __ccs_free_task_security(const struct task_struct *task); | |
15 | + | |
16 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
17 | +static struct ccs_security ccs_oom_security = { | |
18 | + .ccs_domain_info = &ccs_kernel_domain | |
19 | +}; | |
20 | + | |
21 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
22 | +static struct ccs_security ccs_default_security = { | |
23 | + .ccs_domain_info = &ccs_kernel_domain | |
24 | +}; | |
25 | + | |
26 | +/* List of "struct ccs_security". */ | |
27 | +struct list_head ccs_task_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
28 | +/* Lock for protecting ccs_task_security_list[]. */ | |
29 | +static DEFINE_SPINLOCK(ccs_task_security_list_lock); | |
30 | + | |
31 | +/* For exporting variables and functions. */ | |
32 | +struct ccsecurity_exports ccsecurity_exports; | |
33 | +/* Members are updated by loadable kernel module. */ | |
34 | +struct ccsecurity_operations ccsecurity_ops; | |
35 | + | |
36 | +/* Original hooks. */ | |
37 | +static union security_list_options original_cred_prepare; | |
38 | +static union security_list_options original_task_alloc; | |
39 | +static union security_list_options original_task_free; | |
40 | + | |
41 | +#ifdef CONFIG_AKARI_TRACE_EXECVE_COUNT | |
42 | + | |
43 | +/** | |
44 | + * ccs_update_ee_counter - Update "struct ccs_execve" counter. | |
45 | + * | |
46 | + * @count: Count to increment or decrement. | |
47 | + * | |
48 | + * Returns updated counter. | |
49 | + */ | |
50 | +static unsigned int ccs_update_ee_counter(int count) | |
51 | +{ | |
52 | + /* Debug counter for detecting "struct ccs_execve" memory leak. */ | |
53 | + static atomic_t ccs_ee_counter = ATOMIC_INIT(0); | |
54 | + return atomic_add_return(count, &ccs_ee_counter); | |
55 | +} | |
56 | + | |
57 | +/** | |
58 | + * ccs_audit_alloc_execve - Audit allocation of "struct ccs_execve". | |
59 | + * | |
60 | + * @ee: Pointer to "struct ccs_execve". | |
61 | + * | |
62 | + * Returns nothing. | |
63 | + */ | |
64 | +void ccs_audit_alloc_execve(const struct ccs_execve * const ee) | |
65 | +{ | |
66 | + printk(KERN_INFO "AKARI: Allocated %p by pid=%u (count=%u)\n", ee, | |
67 | + current->pid, ccs_update_ee_counter(1) - 1); | |
68 | +} | |
69 | + | |
70 | +/** | |
71 | + * ccs_audit_free_execve - Audit release of "struct ccs_execve". | |
72 | + * | |
73 | + * @ee: Pointer to "struct ccs_execve". | |
74 | + * @task: True if released by current task, false otherwise. | |
75 | + * | |
76 | + * Returns nothing. | |
77 | + */ | |
78 | +void ccs_audit_free_execve(const struct ccs_execve * const ee, | |
79 | + const bool is_current) | |
80 | +{ | |
81 | + const unsigned int tmp = ccs_update_ee_counter(-1); | |
82 | + if (is_current) | |
83 | + printk(KERN_INFO "AKARI: Releasing %p by pid=%u (count=%u)\n", | |
84 | + ee, current->pid, tmp); | |
85 | + else | |
86 | + printk(KERN_INFO "AKARI: Releasing %p by kernel (count=%u)\n", | |
87 | + ee, tmp); | |
88 | +} | |
89 | + | |
90 | +#endif | |
91 | + | |
92 | +#if !defined(CONFIG_AKARI_DEBUG) | |
93 | +#define ccs_debug_trace(pos) do { } while (0) | |
94 | +#else | |
95 | +#define ccs_debug_trace(pos) \ | |
96 | + do { \ | |
97 | + static bool done; \ | |
98 | + if (!done) { \ | |
99 | + printk(KERN_INFO \ | |
100 | + "AKARI: Debug trace: " pos " of 2\n"); \ | |
101 | + done = true; \ | |
102 | + } \ | |
103 | + } while (0) | |
104 | +#endif | |
105 | + | |
106 | +/** | |
107 | + * ccs_clear_execve - Release memory used by do_execve(). | |
108 | + * | |
109 | + * @ret: 0 if do_execve() succeeded, negative value otherwise. | |
110 | + * @security: Pointer to "struct ccs_security". | |
111 | + * | |
112 | + * Returns nothing. | |
113 | + */ | |
114 | +static void ccs_clear_execve(int ret, struct ccs_security *security) | |
115 | +{ | |
116 | + struct ccs_execve *ee = security->ee; | |
117 | + if (security == &ccs_default_security || security == &ccs_oom_security | |
118 | + || !ee) | |
119 | + return; | |
120 | + security->ee = NULL; | |
121 | + ccs_finish_execve(ret, ee); | |
122 | +} | |
123 | + | |
124 | +/** | |
125 | + * ccs_task_alloc_security - Allocate memory for new tasks. | |
126 | + * | |
127 | + * @p: Pointer to "struct task_struct". | |
128 | + * @clone_flags: Flags passed to clone(). | |
129 | + * | |
130 | + * Returns 0 on success, negative value otherwise. | |
131 | + */ | |
132 | +static int ccs_task_alloc_security(struct task_struct *p, | |
133 | + unsigned long clone_flags) | |
134 | +{ | |
135 | + int rc = __ccs_alloc_task_security(p); | |
136 | + if (rc) | |
137 | + return rc; | |
138 | + if (original_task_alloc.task_alloc) { | |
139 | + rc = original_task_alloc.task_alloc(p, clone_flags); | |
140 | + if (rc) | |
141 | + __ccs_free_task_security(p); | |
142 | + } | |
143 | + return rc; | |
144 | +} | |
145 | + | |
146 | +/** | |
147 | + * ccs_task_free_security - Release memory for "struct task_struct". | |
148 | + * | |
149 | + * @p: Pointer to "struct task_struct". | |
150 | + * | |
151 | + * Returns nothing. | |
152 | + */ | |
153 | +static void ccs_task_free_security(struct task_struct *p) | |
154 | +{ | |
155 | + struct ccs_security *ptr = ccs_find_task_security(p); | |
156 | + struct ccs_execve *ee = ptr->ee; | |
157 | + if (original_task_free.task_free) | |
158 | + original_task_free.task_free(p); | |
159 | + /* | |
160 | + * Since an LSM hook for reverting domain transition is missing, | |
161 | + * ccs_finish_execve() is not called if exited immediately after | |
162 | + * execve() failed. | |
163 | + */ | |
164 | + if (ee) { | |
165 | + ccs_debug_trace("2"); | |
166 | + ccs_audit_free_execve(ee, false); | |
167 | + kfree(ee->handler_path); | |
168 | + kfree(ee); | |
169 | + ptr->ee = NULL; | |
170 | + } | |
171 | + __ccs_free_task_security(p); | |
172 | +} | |
173 | + | |
174 | +/** | |
175 | + * ccs_bprm_committing_creds - A hook which is called when do_execve() succeeded. | |
176 | + * | |
177 | + * @bprm: Pointer to "struct linux_binprm". | |
178 | + * | |
179 | + * Returns nothing. | |
180 | + */ | |
181 | +static void ccs_bprm_committing_creds(struct linux_binprm *bprm) | |
182 | +{ | |
183 | + ccs_clear_execve(0, ccs_current_security()); | |
184 | +} | |
185 | + | |
186 | +/** | |
187 | + * ccs_cred_prepare - Allocate memory for new credentials. | |
188 | + * | |
189 | + * @new: Pointer to "struct cred". | |
190 | + * @old: Pointer to "struct cred". | |
191 | + * @gfp: Memory allocation flags. | |
192 | + * | |
193 | + * Returns 0 on success, negative value otherwise. | |
194 | + */ | |
195 | +static int ccs_cred_prepare(struct cred *new, const struct cred *old, | |
196 | + gfp_t gfp) | |
197 | +{ | |
198 | + /* | |
199 | + * For checking whether reverting domain transition is needed or not. | |
200 | + * | |
201 | + * See ccs_find_task_security() for reason. | |
202 | + */ | |
203 | + if (gfp == GFP_KERNEL) | |
204 | + ccs_find_task_security(current); | |
205 | + if (original_cred_prepare.cred_prepare) | |
206 | + return original_cred_prepare.cred_prepare(new, old, gfp); | |
207 | + return 0; | |
208 | +} | |
209 | + | |
210 | +/** | |
211 | + * ccs_bprm_check_security - Check permission for execve(). | |
212 | + * | |
213 | + * @bprm: Pointer to "struct linux_binprm". | |
214 | + * | |
215 | + * Returns 0 on success, negative value otherwise. | |
216 | + */ | |
217 | +static int ccs_bprm_check_security(struct linux_binprm *bprm) | |
218 | +{ | |
219 | + struct ccs_security *security = ccs_current_security(); | |
220 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
221 | + return -ENOMEM; | |
222 | + if (security->ee) | |
223 | + return 0; | |
224 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
225 | + if (!ccs_policy_loaded) | |
226 | + ccs_load_policy(bprm->filename); | |
227 | +#endif | |
228 | + return ccs_start_execve(bprm, &security->ee); | |
229 | +} | |
230 | + | |
231 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 19, 0) | |
232 | +/** | |
233 | + * ccs_file_open - Check permission for open(). | |
234 | + * | |
235 | + * @f: Pointer to "struct file". | |
236 | + * | |
237 | + * Returns 0 on success, negative value otherwise. | |
238 | + */ | |
239 | +static int ccs_file_open(struct file *f) | |
240 | +{ | |
241 | + return ccs_open_permission(f); | |
242 | +} | |
243 | +#else | |
244 | +/** | |
245 | + * ccs_file_open - Check permission for open(). | |
246 | + * | |
247 | + * @f: Pointer to "struct file". | |
248 | + * @cred: Pointer to "struct cred". | |
249 | + * | |
250 | + * Returns 0 on success, negative value otherwise. | |
251 | + */ | |
252 | +static int ccs_file_open(struct file *f, const struct cred *cred) | |
253 | +{ | |
254 | + return ccs_open_permission(f); | |
255 | +} | |
256 | +#endif | |
257 | + | |
258 | +#ifdef CONFIG_SECURITY_PATH | |
259 | + | |
260 | +/** | |
261 | + * ccs_path_chown - Check permission for chown()/chgrp(). | |
262 | + * | |
263 | + * @path: Pointer to "struct path". | |
264 | + * @user: User ID. | |
265 | + * @group: Group ID. | |
266 | + * | |
267 | + * Returns 0 on success, negative value otherwise. | |
268 | + */ | |
269 | +static int ccs_path_chown(const struct path *path, kuid_t user, kgid_t group) | |
270 | +{ | |
271 | + return ccs_chown_permission(path->dentry, path->mnt, user, group); | |
272 | +} | |
273 | + | |
274 | +/** | |
275 | + * ccs_path_chmod - Check permission for chmod(). | |
276 | + * | |
277 | + * @path: Pointer to "struct path". | |
278 | + * @mode: Mode. | |
279 | + * | |
280 | + * Returns 0 on success, negative value otherwise. | |
281 | + */ | |
282 | +static int ccs_path_chmod(const struct path *path, umode_t mode) | |
283 | +{ | |
284 | + return ccs_chmod_permission(path->dentry, path->mnt, mode); | |
285 | +} | |
286 | + | |
287 | +/** | |
288 | + * ccs_path_chroot - Check permission for chroot(). | |
289 | + * | |
290 | + * @path: Pointer to "struct path". | |
291 | + * | |
292 | + * Returns 0 on success, negative value otherwise. | |
293 | + */ | |
294 | +static int ccs_path_chroot(const struct path *path) | |
295 | +{ | |
296 | + return ccs_chroot_permission(path); | |
297 | +} | |
298 | + | |
299 | +/** | |
300 | + * ccs_path_truncate - Check permission for truncate(). | |
301 | + * | |
302 | + * @path: Pointer to "struct path". | |
303 | + * | |
304 | + * Returns 0 on success, negative value otherwise. | |
305 | + */ | |
306 | +static int ccs_path_truncate(const struct path *path) | |
307 | +{ | |
308 | + return ccs_truncate_permission(path->dentry, path->mnt); | |
309 | +} | |
310 | + | |
311 | +#else | |
312 | + | |
313 | +/** | |
314 | + * ccs_inode_setattr - Check permission for chown()/chgrp()/chmod()/truncate(). | |
315 | + * | |
316 | + * @dentry: Pointer to "struct dentry". | |
317 | + * @attr: Pointer to "struct iattr". | |
318 | + * | |
319 | + * Returns 0 on success, negative value otherwise. | |
320 | + */ | |
321 | +static int ccs_inode_setattr(struct dentry *dentry, struct iattr *attr) | |
322 | +{ | |
323 | + const int rc1 = (attr->ia_valid & ATTR_UID) ? | |
324 | + ccs_chown_permission(dentry, NULL, attr->ia_uid, INVALID_GID) : | |
325 | + 0; | |
326 | + const int rc2 = (attr->ia_valid & ATTR_GID) ? | |
327 | + ccs_chown_permission(dentry, NULL, INVALID_UID, attr->ia_gid) : | |
328 | + 0; | |
329 | + const int rc3 = (attr->ia_valid & ATTR_MODE) ? | |
330 | + ccs_chmod_permission(dentry, NULL, attr->ia_mode) : 0; | |
331 | + const int rc4 = (attr->ia_valid & ATTR_SIZE) ? | |
332 | + ccs_truncate_permission(dentry, NULL) : 0; | |
333 | + if (rc4) | |
334 | + return rc4; | |
335 | + if (rc3) | |
336 | + return rc3; | |
337 | + if (rc2) | |
338 | + return rc2; | |
339 | + return rc1; | |
340 | +} | |
341 | + | |
342 | +#endif | |
343 | + | |
344 | +/** | |
345 | + * ccs_inode_getattr - Check permission for stat(). | |
346 | + * | |
347 | + * @path: Pointer to "struct path". | |
348 | + * | |
349 | + * Returns 0 on success, negative value otherwise. | |
350 | + */ | |
351 | +static int ccs_inode_getattr(const struct path *path) | |
352 | +{ | |
353 | + return ccs_getattr_permission(path->mnt, path->dentry); | |
354 | +} | |
355 | + | |
356 | +#ifdef CONFIG_SECURITY_PATH | |
357 | + | |
358 | +/** | |
359 | + * ccs_path_mknod - Check permission for mknod(). | |
360 | + * | |
361 | + * @dir: Pointer to "struct path". | |
362 | + * @dentry: Pointer to "struct dentry". | |
363 | + * @mode: Create mode. | |
364 | + * @dev: Device major/minor number. | |
365 | + * | |
366 | + * Returns 0 on success, negative value otherwise. | |
367 | + */ | |
368 | +static int ccs_path_mknod(const struct path *dir, struct dentry *dentry, | |
369 | + umode_t mode, unsigned int dev) | |
370 | +{ | |
371 | + return ccs_mknod_permission(dentry, dir->mnt, mode, dev); | |
372 | +} | |
373 | + | |
374 | +/** | |
375 | + * ccs_path_mkdir - Check permission for mkdir(). | |
376 | + * | |
377 | + * @dir: Pointer to "struct path". | |
378 | + * @dentry: Pointer to "struct dentry". | |
379 | + * @mode: Create mode. | |
380 | + * | |
381 | + * Returns 0 on success, negative value otherwise. | |
382 | + */ | |
383 | +static int ccs_path_mkdir(const struct path *dir, struct dentry *dentry, | |
384 | + umode_t mode) | |
385 | +{ | |
386 | + return ccs_mkdir_permission(dentry, dir->mnt, mode); | |
387 | +} | |
388 | + | |
389 | +/** | |
390 | + * ccs_path_rmdir - Check permission for rmdir(). | |
391 | + * | |
392 | + * @dir: Pointer to "struct path". | |
393 | + * @dentry: Pointer to "struct dentry". | |
394 | + * | |
395 | + * Returns 0 on success, negative value otherwise. | |
396 | + */ | |
397 | +static int ccs_path_rmdir(const struct path *dir, struct dentry *dentry) | |
398 | +{ | |
399 | + return ccs_rmdir_permission(dentry, dir->mnt); | |
400 | +} | |
401 | + | |
402 | +/** | |
403 | + * ccs_path_unlink - Check permission for unlink(). | |
404 | + * | |
405 | + * @dir: Pointer to "struct path". | |
406 | + * @dentry: Pointer to "struct dentry". | |
407 | + * | |
408 | + * Returns 0 on success, negative value otherwise. | |
409 | + */ | |
410 | +static int ccs_path_unlink(const struct path *dir, struct dentry *dentry) | |
411 | +{ | |
412 | + return ccs_unlink_permission(dentry, dir->mnt); | |
413 | +} | |
414 | + | |
415 | +/** | |
416 | + * ccs_path_symlink - Check permission for symlink(). | |
417 | + * | |
418 | + * @dir: Pointer to "struct path". | |
419 | + * @dentry: Pointer to "struct dentry". | |
420 | + * @old_name: Content of symbolic link. | |
421 | + * | |
422 | + * Returns 0 on success, negative value otherwise. | |
423 | + */ | |
424 | +static int ccs_path_symlink(const struct path *dir, struct dentry *dentry, | |
425 | + const char *old_name) | |
426 | +{ | |
427 | + return ccs_symlink_permission(dentry, dir->mnt, old_name); | |
428 | +} | |
429 | + | |
430 | +/** | |
431 | + * ccs_path_rename - Check permission for rename(). | |
432 | + * | |
433 | + * @old_dir: Pointer to "struct path". | |
434 | + * @old_dentry: Pointer to "struct dentry". | |
435 | + * @new_dir: Pointer to "struct path". | |
436 | + * @new_dentry: Pointer to "struct dentry". | |
437 | + * | |
438 | + * Returns 0 on success, negative value otherwise. | |
439 | + */ | |
440 | +static int ccs_path_rename(const struct path *old_dir, | |
441 | + struct dentry *old_dentry, | |
442 | + const struct path *new_dir, | |
443 | + struct dentry *new_dentry) | |
444 | +{ | |
445 | + return ccs_rename_permission(old_dentry, new_dentry, old_dir->mnt); | |
446 | +} | |
447 | + | |
448 | +/** | |
449 | + * ccs_path_link - Check permission for link(). | |
450 | + * | |
451 | + * @old_dentry: Pointer to "struct dentry". | |
452 | + * @new_dir: Pointer to "struct path". | |
453 | + * @new_dentry: Pointer to "struct dentry". | |
454 | + * | |
455 | + * Returns 0 on success, negative value otherwise. | |
456 | + */ | |
457 | +static int ccs_path_link(struct dentry *old_dentry, const struct path *new_dir, | |
458 | + struct dentry *new_dentry) | |
459 | +{ | |
460 | + return ccs_link_permission(old_dentry, new_dentry, new_dir->mnt); | |
461 | +} | |
462 | + | |
463 | +#else | |
464 | + | |
465 | +/** | |
466 | + * ccs_inode_mknod - Check permission for mknod(). | |
467 | + * | |
468 | + * @dir: Pointer to "struct inode". | |
469 | + * @dentry: Pointer to "struct dentry". | |
470 | + * @mode: Create mode. | |
471 | + * @dev: Device major/minor number. | |
472 | + * | |
473 | + * Returns 0 on success, negative value otherwise. | |
474 | + */ | |
475 | +static int ccs_inode_mknod(struct inode *dir, struct dentry *dentry, | |
476 | + umode_t mode, dev_t dev) | |
477 | +{ | |
478 | + return ccs_mknod_permission(dentry, NULL, mode, dev); | |
479 | +} | |
480 | + | |
481 | +/** | |
482 | + * ccs_inode_mkdir - Check permission for mkdir(). | |
483 | + * | |
484 | + * @dir: Pointer to "struct inode". | |
485 | + * @dentry: Pointer to "struct dentry". | |
486 | + * @mode: Create mode. | |
487 | + * | |
488 | + * Returns 0 on success, negative value otherwise. | |
489 | + */ | |
490 | +static int ccs_inode_mkdir(struct inode *dir, struct dentry *dentry, | |
491 | + umode_t mode) | |
492 | +{ | |
493 | + return ccs_mkdir_permission(dentry, NULL, mode); | |
494 | +} | |
495 | + | |
496 | +/** | |
497 | + * ccs_inode_rmdir - Check permission for rmdir(). | |
498 | + * | |
499 | + * @dir: Pointer to "struct inode". | |
500 | + * @dentry: Pointer to "struct dentry". | |
501 | + * | |
502 | + * Returns 0 on success, negative value otherwise. | |
503 | + */ | |
504 | +static int ccs_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
505 | +{ | |
506 | + return ccs_rmdir_permission(dentry, NULL); | |
507 | +} | |
508 | + | |
509 | +/** | |
510 | + * ccs_inode_unlink - Check permission for unlink(). | |
511 | + * | |
512 | + * @dir: Pointer to "struct inode". | |
513 | + * @dentry: Pointer to "struct dentry". | |
514 | + * | |
515 | + * Returns 0 on success, negative value otherwise. | |
516 | + */ | |
517 | +static int ccs_inode_unlink(struct inode *dir, struct dentry *dentry) | |
518 | +{ | |
519 | + return ccs_unlink_permission(dentry, NULL); | |
520 | +} | |
521 | + | |
522 | +/** | |
523 | + * ccs_inode_symlink - Check permission for symlink(). | |
524 | + * | |
525 | + * @dir: Pointer to "struct inode". | |
526 | + * @dentry: Pointer to "struct dentry". | |
527 | + * @old_name: Content of symbolic link. | |
528 | + * | |
529 | + * Returns 0 on success, negative value otherwise. | |
530 | + */ | |
531 | +static int ccs_inode_symlink(struct inode *dir, struct dentry *dentry, | |
532 | + const char *old_name) | |
533 | +{ | |
534 | + return ccs_symlink_permission(dentry, NULL, old_name); | |
535 | +} | |
536 | + | |
537 | +/** | |
538 | + * ccs_inode_rename - Check permission for rename(). | |
539 | + * | |
540 | + * @old_dir: Pointer to "struct inode". | |
541 | + * @old_dentry: Pointer to "struct dentry". | |
542 | + * @new_dir: Pointer to "struct inode". | |
543 | + * @new_dentry: Pointer to "struct dentry". | |
544 | + * | |
545 | + * Returns 0 on success, negative value otherwise. | |
546 | + */ | |
547 | +static int ccs_inode_rename(struct inode *old_dir, struct dentry *old_dentry, | |
548 | + struct inode *new_dir, struct dentry *new_dentry) | |
549 | +{ | |
550 | + return ccs_rename_permission(old_dentry, new_dentry, NULL); | |
551 | +} | |
552 | + | |
553 | +/** | |
554 | + * ccs_inode_link - Check permission for link(). | |
555 | + * | |
556 | + * @old_dentry: Pointer to "struct dentry". | |
557 | + * @dir: Pointer to "struct inode". | |
558 | + * @new_dentry: Pointer to "struct dentry". | |
559 | + * | |
560 | + * Returns 0 on success, negative value otherwise. | |
561 | + */ | |
562 | +static int ccs_inode_link(struct dentry *old_dentry, struct inode *dir, | |
563 | + struct dentry *new_dentry) | |
564 | +{ | |
565 | + return ccs_link_permission(old_dentry, new_dentry, NULL); | |
566 | +} | |
567 | + | |
568 | +/** | |
569 | + * ccs_inode_create - Check permission for creat(). | |
570 | + * | |
571 | + * @dir: Pointer to "struct inode". | |
572 | + * @dentry: Pointer to "struct dentry". | |
573 | + * @mode: Create mode. | |
574 | + * | |
575 | + * Returns 0 on success, negative value otherwise. | |
576 | + */ | |
577 | +static int ccs_inode_create(struct inode *dir, struct dentry *dentry, | |
578 | + umode_t mode) | |
579 | +{ | |
580 | + return ccs_mknod_permission(dentry, NULL, mode, 0); | |
581 | +} | |
582 | + | |
583 | +#endif | |
584 | + | |
585 | +#ifdef CONFIG_SECURITY_NETWORK | |
586 | + | |
587 | +#include <net/sock.h> | |
588 | + | |
589 | +/* Structure for remembering an accept()ed socket's status. */ | |
590 | +struct ccs_socket_tag { | |
591 | + struct list_head list; | |
592 | + struct inode *inode; | |
593 | + int status; | |
594 | + struct rcu_head rcu; | |
595 | +}; | |
596 | + | |
597 | +/* | |
598 | + * List for managing accept()ed sockets. | |
599 | + * Since we don't need to keep an accept()ed socket into this list after | |
600 | + * once the permission was granted, the number of entries in this list is | |
601 | + * likely small. Therefore, we don't use hash tables. | |
602 | + */ | |
603 | +static LIST_HEAD(ccs_accepted_socket_list); | |
604 | +/* Lock for protecting ccs_accepted_socket_list . */ | |
605 | +static DEFINE_SPINLOCK(ccs_accepted_socket_list_lock); | |
606 | + | |
607 | +/** | |
608 | + * ccs_update_socket_tag - Update tag associated with accept()ed sockets. | |
609 | + * | |
610 | + * @inode: Pointer to "struct inode". | |
611 | + * @status: New status. | |
612 | + * | |
613 | + * Returns nothing. | |
614 | + * | |
615 | + * If @status == 0, memory for that socket will be released after RCU grace | |
616 | + * period. | |
617 | + */ | |
618 | +static void ccs_update_socket_tag(struct inode *inode, int status) | |
619 | +{ | |
620 | + struct ccs_socket_tag *ptr; | |
621 | + /* | |
622 | + * Protect whole section because multiple threads may call this | |
623 | + * function with same "sock" via ccs_validate_socket(). | |
624 | + */ | |
625 | + spin_lock(&ccs_accepted_socket_list_lock); | |
626 | + rcu_read_lock(); | |
627 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
628 | + if (ptr->inode != inode) | |
629 | + continue; | |
630 | + ptr->status = status; | |
631 | + if (status) | |
632 | + break; | |
633 | + list_del_rcu(&ptr->list); | |
634 | + kfree_rcu(ptr, rcu); | |
635 | + break; | |
636 | + } | |
637 | + rcu_read_unlock(); | |
638 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
639 | +} | |
640 | + | |
641 | +/** | |
642 | + * ccs_validate_socket - Check post accept() permission if needed. | |
643 | + * | |
644 | + * @sock: Pointer to "struct socket". | |
645 | + * | |
646 | + * Returns 0 on success, negative value otherwise. | |
647 | + */ | |
648 | +static int ccs_validate_socket(struct socket *sock) | |
649 | +{ | |
650 | + struct inode *inode = SOCK_INODE(sock); | |
651 | + struct ccs_socket_tag *ptr; | |
652 | + int ret = 0; | |
653 | + rcu_read_lock(); | |
654 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
655 | + if (ptr->inode != inode) | |
656 | + continue; | |
657 | + ret = ptr->status; | |
658 | + break; | |
659 | + } | |
660 | + rcu_read_unlock(); | |
661 | + if (ret <= 0) | |
662 | + /* | |
663 | + * This socket is not an accept()ed socket or this socket is | |
664 | + * an accept()ed socket and post accept() permission is done. | |
665 | + */ | |
666 | + return ret; | |
667 | + /* | |
668 | + * Check post accept() permission now. | |
669 | + * | |
670 | + * Strictly speaking, we need to pass both listen()ing socket and | |
671 | + * accept()ed socket to __ccs_socket_post_accept_permission(). | |
672 | + * But since socket's family and type are same for both sockets, | |
673 | + * passing the accept()ed socket in place for the listen()ing socket | |
674 | + * will work. | |
675 | + */ | |
676 | + ret = ccs_socket_post_accept_permission(sock, sock); | |
677 | + /* | |
678 | + * If permission was granted, we forget that this is an accept()ed | |
679 | + * socket. Otherwise, we remember that this socket needs to return | |
680 | + * error for subsequent socketcalls. | |
681 | + */ | |
682 | + ccs_update_socket_tag(inode, ret); | |
683 | + return ret; | |
684 | +} | |
685 | + | |
686 | +/** | |
687 | + * ccs_socket_accept - Check permission for accept(). | |
688 | + * | |
689 | + * @sock: Pointer to "struct socket". | |
690 | + * @newsock: Pointer to "struct socket". | |
691 | + * | |
692 | + * Returns 0 on success, negative value otherwise. | |
693 | + * | |
694 | + * This hook is used for setting up environment for doing post accept() | |
695 | + * permission check. If dereferencing sock->ops->something() were ordered by | |
696 | + * rcu_dereference(), we could replace sock->ops with "a copy of original | |
697 | + * sock->ops with modified sock->ops->accept()" using rcu_assign_pointer() | |
698 | + * in order to do post accept() permission check before returning to userspace. | |
699 | + * If we make the copy in security_socket_post_create(), it would be possible | |
700 | + * to safely replace sock->ops here, but we don't do so because we don't want | |
701 | + * to allocate memory for sockets which do not call sock->ops->accept(). | |
702 | + * Therefore, we do post accept() permission check upon next socket syscalls | |
703 | + * rather than between sock->ops->accept() and returning to userspace. | |
704 | + * This means that if a socket was close()d before calling some socket | |
705 | + * syscalls, post accept() permission check will not be done. | |
706 | + */ | |
707 | +static int ccs_socket_accept(struct socket *sock, struct socket *newsock) | |
708 | +{ | |
709 | + struct ccs_socket_tag *ptr; | |
710 | + const int rc = ccs_validate_socket(sock); | |
711 | + if (rc < 0) | |
712 | + return rc; | |
713 | + ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); | |
714 | + if (!ptr) | |
715 | + return -ENOMEM; | |
716 | + /* | |
717 | + * Subsequent LSM hooks will receive "newsock". Therefore, I mark | |
718 | + * "newsock" as "an accept()ed socket but post accept() permission | |
719 | + * check is not done yet" by allocating memory using inode of the | |
720 | + * "newsock" as a search key. | |
721 | + */ | |
722 | + ptr->inode = SOCK_INODE(newsock); | |
723 | + ptr->status = 1; /* Check post accept() permission later. */ | |
724 | + spin_lock(&ccs_accepted_socket_list_lock); | |
725 | + list_add_tail_rcu(&ptr->list, &ccs_accepted_socket_list); | |
726 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
727 | + return 0; | |
728 | +} | |
729 | + | |
730 | +/** | |
731 | + * ccs_socket_listen - Check permission for listen(). | |
732 | + * | |
733 | + * @sock: Pointer to "struct socket". | |
734 | + * @backlog: Backlog parameter. | |
735 | + * | |
736 | + * Returns 0 on success, negative value otherwise. | |
737 | + */ | |
738 | +static int ccs_socket_listen(struct socket *sock, int backlog) | |
739 | +{ | |
740 | + const int rc = ccs_validate_socket(sock); | |
741 | + if (rc < 0) | |
742 | + return rc; | |
743 | + return ccs_socket_listen_permission(sock); | |
744 | +} | |
745 | + | |
746 | +/** | |
747 | + * ccs_socket_connect - Check permission for connect(). | |
748 | + * | |
749 | + * @sock: Pointer to "struct socket". | |
750 | + * @addr: Pointer to "struct sockaddr". | |
751 | + * @addr_len: Size of @addr. | |
752 | + * | |
753 | + * Returns 0 on success, negative value otherwise. | |
754 | + */ | |
755 | +static int ccs_socket_connect(struct socket *sock, struct sockaddr *addr, | |
756 | + int addr_len) | |
757 | +{ | |
758 | + const int rc = ccs_validate_socket(sock); | |
759 | + if (rc < 0) | |
760 | + return rc; | |
761 | + return ccs_socket_connect_permission(sock, addr, addr_len); | |
762 | +} | |
763 | + | |
764 | +/** | |
765 | + * ccs_socket_bind - Check permission for bind(). | |
766 | + * | |
767 | + * @sock: Pointer to "struct socket". | |
768 | + * @addr: Pointer to "struct sockaddr". | |
769 | + * @addr_len: Size of @addr. | |
770 | + * | |
771 | + * Returns 0 on success, negative value otherwise. | |
772 | + */ | |
773 | +static int ccs_socket_bind(struct socket *sock, struct sockaddr *addr, | |
774 | + int addr_len) | |
775 | +{ | |
776 | + const int rc = ccs_validate_socket(sock); | |
777 | + if (rc < 0) | |
778 | + return rc; | |
779 | + return ccs_socket_bind_permission(sock, addr, addr_len); | |
780 | +} | |
781 | + | |
782 | +/** | |
783 | + * ccs_socket_sendmsg - Check permission for sendmsg(). | |
784 | + * | |
785 | + * @sock: Pointer to "struct socket". | |
786 | + * @msg: Pointer to "struct msghdr". | |
787 | + * @size: Size of message. | |
788 | + * | |
789 | + * Returns 0 on success, negative value otherwise. | |
790 | + */ | |
791 | +static int ccs_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
792 | + int size) | |
793 | +{ | |
794 | + const int rc = ccs_validate_socket(sock); | |
795 | + if (rc < 0) | |
796 | + return rc; | |
797 | + return ccs_socket_sendmsg_permission(sock, msg, size); | |
798 | +} | |
799 | + | |
800 | +/** | |
801 | + * ccs_socket_recvmsg - Check permission for recvmsg(). | |
802 | + * | |
803 | + * @sock: Pointer to "struct socket". | |
804 | + * @msg: Pointer to "struct msghdr". | |
805 | + * @size: Size of message. | |
806 | + * @flags: Flags. | |
807 | + * | |
808 | + * Returns 0 on success, negative value otherwise. | |
809 | + */ | |
810 | +static int ccs_socket_recvmsg(struct socket *sock, struct msghdr *msg, | |
811 | + int size, int flags) | |
812 | +{ | |
813 | + return ccs_validate_socket(sock); | |
814 | +} | |
815 | + | |
816 | +/** | |
817 | + * ccs_socket_getsockname - Check permission for getsockname(). | |
818 | + * | |
819 | + * @sock: Pointer to "struct socket". | |
820 | + * | |
821 | + * Returns 0 on success, negative value otherwise. | |
822 | + */ | |
823 | +static int ccs_socket_getsockname(struct socket *sock) | |
824 | +{ | |
825 | + return ccs_validate_socket(sock); | |
826 | +} | |
827 | + | |
828 | +/** | |
829 | + * ccs_socket_getpeername - Check permission for getpeername(). | |
830 | + * | |
831 | + * @sock: Pointer to "struct socket". | |
832 | + * | |
833 | + * Returns 0 on success, negative value otherwise. | |
834 | + */ | |
835 | +static int ccs_socket_getpeername(struct socket *sock) | |
836 | +{ | |
837 | + return ccs_validate_socket(sock); | |
838 | +} | |
839 | + | |
840 | +/** | |
841 | + * ccs_socket_getsockopt - Check permission for getsockopt(). | |
842 | + * | |
843 | + * @sock: Pointer to "struct socket". | |
844 | + * @level: Level. | |
845 | + * @optname: Option's name, | |
846 | + * | |
847 | + * Returns 0 on success, negative value otherwise. | |
848 | + */ | |
849 | +static int ccs_socket_getsockopt(struct socket *sock, int level, int optname) | |
850 | +{ | |
851 | + return ccs_validate_socket(sock); | |
852 | +} | |
853 | + | |
854 | +/** | |
855 | + * ccs_socket_setsockopt - Check permission for setsockopt(). | |
856 | + * | |
857 | + * @sock: Pointer to "struct socket". | |
858 | + * @level: Level. | |
859 | + * @optname: Option's name, | |
860 | + * | |
861 | + * Returns 0 on success, negative value otherwise. | |
862 | + */ | |
863 | +static int ccs_socket_setsockopt(struct socket *sock, int level, int optname) | |
864 | +{ | |
865 | + return ccs_validate_socket(sock); | |
866 | +} | |
867 | + | |
868 | +/** | |
869 | + * ccs_socket_shutdown - Check permission for shutdown(). | |
870 | + * | |
871 | + * @sock: Pointer to "struct socket". | |
872 | + * @how: Shutdown mode. | |
873 | + * | |
874 | + * Returns 0 on success, negative value otherwise. | |
875 | + */ | |
876 | +static int ccs_socket_shutdown(struct socket *sock, int how) | |
877 | +{ | |
878 | + return ccs_validate_socket(sock); | |
879 | +} | |
880 | + | |
881 | +#define SOCKFS_MAGIC 0x534F434B | |
882 | + | |
883 | +/** | |
884 | + * ccs_inode_free_security - Release memory associated with an inode. | |
885 | + * | |
886 | + * @inode: Pointer to "struct inode". | |
887 | + * | |
888 | + * Returns nothing. | |
889 | + * | |
890 | + * We use this hook for releasing memory associated with an accept()ed socket. | |
891 | + */ | |
892 | +static void ccs_inode_free_security(struct inode *inode) | |
893 | +{ | |
894 | + if (inode->i_sb && inode->i_sb->s_magic == SOCKFS_MAGIC) | |
895 | + ccs_update_socket_tag(inode, 0); | |
896 | +} | |
897 | + | |
898 | +#endif | |
899 | + | |
900 | +/** | |
901 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
902 | + * | |
903 | + * @old_path: Pointer to "struct path". | |
904 | + * @new_path: Pointer to "struct path". | |
905 | + * | |
906 | + * Returns 0 on success, negative value otherwise. | |
907 | + */ | |
908 | +static int ccs_sb_pivotroot(const struct path *old_path, | |
909 | + const struct path *new_path) | |
910 | +{ | |
911 | + return ccs_pivot_root_permission(old_path, new_path); | |
912 | +} | |
913 | + | |
914 | +/** | |
915 | + * ccs_sb_mount - Check permission for mount(). | |
916 | + * | |
917 | + * @dev_name: Name of device file. | |
918 | + * @path: Pointer to "struct path". | |
919 | + * @type: Name of filesystem type. Maybe NULL. | |
920 | + * @flags: Mount options. | |
921 | + * @data_page: Optional data. Maybe NULL. | |
922 | + * | |
923 | + * Returns 0 on success, negative value otherwise. | |
924 | + */ | |
925 | +static int ccs_sb_mount(const char *dev_name, const struct path *path, | |
926 | + const char *type, unsigned long flags, void *data_page) | |
927 | +{ | |
928 | + return ccs_mount_permission(dev_name, path, type, flags, data_page); | |
929 | +} | |
930 | + | |
931 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0) | |
932 | +/** | |
933 | + * ccs_move_mount - Check permission for move_mount() operation. | |
934 | + * | |
935 | + * @from_path: Pointer to "struct path". | |
936 | + * @to_path: Pointer to "struct path". | |
937 | + * | |
938 | + * Returns 0 on success, negative value otherwise. | |
939 | + */ | |
940 | +static int ccs_move_mount(const struct path *from_path, const struct path *to_path) | |
941 | +{ | |
942 | + return ccs_move_mount_permission(from_path, to_path); | |
943 | +} | |
944 | +#endif | |
945 | + | |
946 | +/** | |
947 | + * ccs_sb_umount - Check permission for umount(). | |
948 | + * | |
949 | + * @mnt: Pointer to "struct vfsmount". | |
950 | + * @flags: Unmount flags. | |
951 | + * | |
952 | + * Returns 0 on success, negative value otherwise. | |
953 | + */ | |
954 | +static int ccs_sb_umount(struct vfsmount *mnt, int flags) | |
955 | +{ | |
956 | + return ccs_umount_permission(mnt, flags); | |
957 | +} | |
958 | + | |
959 | +/** | |
960 | + * ccs_file_fcntl - Check permission for fcntl(). | |
961 | + * | |
962 | + * @file: Pointer to "struct file". | |
963 | + * @cmd: Command number. | |
964 | + * @arg: Value for @cmd. | |
965 | + * | |
966 | + * Returns 0 on success, negative value otherwise. | |
967 | + */ | |
968 | +static int ccs_file_fcntl(struct file *file, unsigned int cmd, | |
969 | + unsigned long arg) | |
970 | +{ | |
971 | + return ccs_fcntl_permission(file, cmd, arg); | |
972 | +} | |
973 | + | |
974 | +/** | |
975 | + * ccs_file_ioctl - Check permission for ioctl(). | |
976 | + * | |
977 | + * @filp: Pointer to "struct file". | |
978 | + * @cmd: Command number. | |
979 | + * @arg: Value for @cmd. | |
980 | + * | |
981 | + * Returns 0 on success, negative value otherwise. | |
982 | + */ | |
983 | +static int ccs_file_ioctl(struct file *filp, unsigned int cmd, | |
984 | + unsigned long arg) | |
985 | +{ | |
986 | + return ccs_ioctl_permission(filp, cmd, arg); | |
987 | +} | |
988 | + | |
989 | +#define MY_HOOK_INIT(HEAD, HOOK) \ | |
990 | + { .head = &probe_dummy_security_hook_heads.HEAD, \ | |
991 | + .hook = { .HEAD = HOOK } } | |
992 | + | |
993 | +static struct security_hook_list akari_hooks[] = { | |
994 | + /* Security context allocator. */ | |
995 | + MY_HOOK_INIT(task_free, ccs_task_free_security), | |
996 | + MY_HOOK_INIT(cred_prepare, ccs_cred_prepare), | |
997 | + MY_HOOK_INIT(task_alloc, ccs_task_alloc_security), | |
998 | + /* Security context updater for successful execve(). */ | |
999 | + MY_HOOK_INIT(bprm_check_security, ccs_bprm_check_security), | |
1000 | + MY_HOOK_INIT(bprm_committing_creds, ccs_bprm_committing_creds), | |
1001 | + /* Various permission checker. */ | |
1002 | + MY_HOOK_INIT(file_open, ccs_file_open), | |
1003 | + MY_HOOK_INIT(file_fcntl, ccs_file_fcntl), | |
1004 | + MY_HOOK_INIT(file_ioctl, ccs_file_ioctl), | |
1005 | + MY_HOOK_INIT(sb_pivotroot, ccs_sb_pivotroot), | |
1006 | + MY_HOOK_INIT(sb_mount, ccs_sb_mount), | |
1007 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0) | |
1008 | + MY_HOOK_INIT(move_mount, ccs_move_mount), | |
1009 | +#endif | |
1010 | + MY_HOOK_INIT(sb_umount, ccs_sb_umount), | |
1011 | +#ifdef CONFIG_SECURITY_PATH | |
1012 | + MY_HOOK_INIT(path_mknod, ccs_path_mknod), | |
1013 | + MY_HOOK_INIT(path_mkdir, ccs_path_mkdir), | |
1014 | + MY_HOOK_INIT(path_rmdir, ccs_path_rmdir), | |
1015 | + MY_HOOK_INIT(path_unlink, ccs_path_unlink), | |
1016 | + MY_HOOK_INIT(path_symlink, ccs_path_symlink), | |
1017 | + MY_HOOK_INIT(path_rename, ccs_path_rename), | |
1018 | + MY_HOOK_INIT(path_link, ccs_path_link), | |
1019 | + MY_HOOK_INIT(path_truncate, ccs_path_truncate), | |
1020 | + MY_HOOK_INIT(path_chmod, ccs_path_chmod), | |
1021 | + MY_HOOK_INIT(path_chown, ccs_path_chown), | |
1022 | + MY_HOOK_INIT(path_chroot, ccs_path_chroot), | |
1023 | +#else | |
1024 | + MY_HOOK_INIT(inode_mknod, ccs_inode_mknod), | |
1025 | + MY_HOOK_INIT(inode_mkdir, ccs_inode_mkdir), | |
1026 | + MY_HOOK_INIT(inode_rmdir, ccs_inode_rmdir), | |
1027 | + MY_HOOK_INIT(inode_unlink, ccs_inode_unlink), | |
1028 | + MY_HOOK_INIT(inode_symlink, ccs_inode_symlink), | |
1029 | + MY_HOOK_INIT(inode_rename, ccs_inode_rename), | |
1030 | + MY_HOOK_INIT(inode_link, ccs_inode_link), | |
1031 | + MY_HOOK_INIT(inode_create, ccs_inode_create), | |
1032 | + MY_HOOK_INIT(inode_setattr, ccs_inode_setattr), | |
1033 | +#endif | |
1034 | + MY_HOOK_INIT(inode_getattr, ccs_inode_getattr), | |
1035 | +#ifdef CONFIG_SECURITY_NETWORK | |
1036 | + MY_HOOK_INIT(socket_bind, ccs_socket_bind), | |
1037 | + MY_HOOK_INIT(socket_connect, ccs_socket_connect), | |
1038 | + MY_HOOK_INIT(socket_listen, ccs_socket_listen), | |
1039 | + MY_HOOK_INIT(socket_sendmsg, ccs_socket_sendmsg), | |
1040 | + MY_HOOK_INIT(socket_recvmsg, ccs_socket_recvmsg), | |
1041 | + MY_HOOK_INIT(socket_getsockname, ccs_socket_getsockname), | |
1042 | + MY_HOOK_INIT(socket_getpeername, ccs_socket_getpeername), | |
1043 | + MY_HOOK_INIT(socket_getsockopt, ccs_socket_getsockopt), | |
1044 | + MY_HOOK_INIT(socket_setsockopt, ccs_socket_setsockopt), | |
1045 | + MY_HOOK_INIT(socket_shutdown, ccs_socket_shutdown), | |
1046 | + MY_HOOK_INIT(socket_accept, ccs_socket_accept), | |
1047 | + MY_HOOK_INIT(inode_free_security, ccs_inode_free_security), | |
1048 | +#endif | |
1049 | +}; | |
1050 | + | |
1051 | +static inline void add_hook(struct security_hook_list *hook) | |
1052 | +{ | |
1053 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0) | |
1054 | + hlist_add_tail_rcu(&hook->list, hook->head); | |
1055 | +#else | |
1056 | + list_add_tail_rcu(&hook->list, hook->head); | |
1057 | +#endif | |
1058 | +} | |
1059 | + | |
1060 | +static void __init swap_hook(struct security_hook_list *hook, | |
1061 | + union security_list_options *original) | |
1062 | +{ | |
1063 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0) | |
1064 | + struct hlist_head *list = hook->head; | |
1065 | + | |
1066 | + if (hlist_empty(list)) { | |
1067 | + add_hook(hook); | |
1068 | + } else { | |
1069 | + struct security_hook_list *shp = | |
1070 | + hlist_entry(list->first, typeof(*shp), list); | |
1071 | + | |
1072 | + while (shp->list.next) | |
1073 | + shp = hlist_entry(shp->list.next, typeof(*shp), list); | |
1074 | + *original = shp->hook; | |
1075 | + smp_wmb(); | |
1076 | + shp->hook = hook->hook; | |
1077 | + } | |
1078 | +#else | |
1079 | + struct list_head *list = hook->head; | |
1080 | + | |
1081 | + if (list_empty(list)) { | |
1082 | + add_hook(hook); | |
1083 | + } else { | |
1084 | + struct security_hook_list *shp = | |
1085 | + list_last_entry(list, struct security_hook_list, list); | |
1086 | + *original = shp->hook; | |
1087 | + smp_wmb(); | |
1088 | + shp->hook = hook->hook; | |
1089 | + } | |
1090 | +#endif | |
1091 | +} | |
1092 | + | |
1093 | +#if defined(CONFIG_STRICT_KERNEL_RWX) && !defined(CONFIG_SECURITY_WRITABLE_HOOKS) | |
1094 | +#include <linux/uaccess.h> /* probe_kernel_write() */ | |
1095 | +#define NEED_TO_CHECK_HOOKS_ARE_WRITABLE | |
1096 | + | |
1097 | +#if defined(CONFIG_X86) | |
1098 | +#define MAX_RO_PAGES 1024 | |
1099 | +static struct page *ro_pages[MAX_RO_PAGES] __initdata; | |
1100 | +static unsigned int ro_pages_len __initdata; | |
1101 | + | |
1102 | +static bool __init lsm_test_page_ro(void *addr) | |
1103 | +{ | |
1104 | + unsigned int i; | |
1105 | + int unused; | |
1106 | + struct page *page; | |
1107 | + | |
1108 | + page = (struct page *) lookup_address((unsigned long) addr, &unused); | |
1109 | + if (!page) | |
1110 | + return false; | |
1111 | + if (test_bit(_PAGE_BIT_RW, &(page->flags))) | |
1112 | + return true; | |
1113 | + for (i = 0; i < ro_pages_len; i++) | |
1114 | + if (page == ro_pages[i]) | |
1115 | + return true; | |
1116 | + if (ro_pages_len == MAX_RO_PAGES) | |
1117 | + return false; | |
1118 | + ro_pages[ro_pages_len++] = page; | |
1119 | + return true; | |
1120 | +} | |
1121 | + | |
1122 | +static bool __init check_ro_pages(struct security_hook_heads *hooks) | |
1123 | +{ | |
1124 | + int i; | |
1125 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0) | |
1126 | + struct hlist_head *list = &hooks->capable; | |
1127 | + | |
1128 | + if (!probe_kernel_write(list, list, sizeof(void *))) | |
1129 | + return true; | |
1130 | + for (i = 0; i < ARRAY_SIZE(akari_hooks); i++) { | |
1131 | + struct hlist_head *head = akari_hooks[i].head; | |
1132 | + struct security_hook_list *shp; | |
1133 | + | |
1134 | + if (!lsm_test_page_ro(&head->first)) | |
1135 | + return false; | |
1136 | + hlist_for_each_entry(shp, head, list) | |
1137 | + if (!lsm_test_page_ro(&shp->list.next) || | |
1138 | + !lsm_test_page_ro(&shp->list.pprev)) | |
1139 | + return false; | |
1140 | + } | |
1141 | +#else | |
1142 | + struct list_head *list = &hooks->capable; | |
1143 | + | |
1144 | + if (!probe_kernel_write(list, list, sizeof(void *))) | |
1145 | + return true; | |
1146 | + for (i = 0; i < ARRAY_SIZE(akari_hooks); i++) { | |
1147 | + struct list_head *head = akari_hooks[i].head; | |
1148 | + struct security_hook_list *shp; | |
1149 | + | |
1150 | + if (!lsm_test_page_ro(&head->next) || | |
1151 | + !lsm_test_page_ro(&head->prev)) | |
1152 | + return false; | |
1153 | + list_for_each_entry(shp, head, list) | |
1154 | + if (!lsm_test_page_ro(&shp->list.next) || | |
1155 | + !lsm_test_page_ro(&shp->list.prev)) | |
1156 | + return false; | |
1157 | + } | |
1158 | +#endif | |
1159 | + return true; | |
1160 | +} | |
1161 | +#else | |
1162 | +static bool __init check_ro_pages(struct security_hook_heads *hooks) | |
1163 | +{ | |
1164 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0) | |
1165 | + struct hlist_head *list = &hooks->capable; | |
1166 | +#else | |
1167 | + struct list_head *list = &hooks->capable; | |
1168 | +#endif | |
1169 | + | |
1170 | + return !probe_kernel_write(list, list, sizeof(void *)); | |
1171 | +} | |
1172 | +#endif | |
1173 | +#endif | |
1174 | + | |
1175 | +/** | |
1176 | + * ccs_init - Initialize this module. | |
1177 | + * | |
1178 | + * Returns 0 on success, negative value otherwise. | |
1179 | + */ | |
1180 | +static int __init ccs_init(void) | |
1181 | +{ | |
1182 | + int idx; | |
1183 | + struct security_hook_heads *hooks = probe_security_hook_heads(); | |
1184 | + if (!hooks) | |
1185 | + goto out; | |
1186 | + for (idx = 0; idx < ARRAY_SIZE(akari_hooks); idx++) | |
1187 | + akari_hooks[idx].head = ((void *) hooks) | |
1188 | + + ((unsigned long) akari_hooks[idx].head) | |
1189 | + - ((unsigned long) &probe_dummy_security_hook_heads); | |
1190 | +#if defined(NEED_TO_CHECK_HOOKS_ARE_WRITABLE) | |
1191 | + if (!check_ro_pages(hooks)) { | |
1192 | + printk(KERN_INFO "Can't update security_hook_heads due to write protected. Retry with rodata=0 kernel command line option added.\n"); | |
1193 | + return -EINVAL; | |
1194 | + } | |
1195 | +#endif | |
1196 | + ccsecurity_exports.find_task_by_vpid = probe_find_task_by_vpid(); | |
1197 | + if (!ccsecurity_exports.find_task_by_vpid) | |
1198 | + goto out; | |
1199 | + ccsecurity_exports.find_task_by_pid_ns = probe_find_task_by_pid_ns(); | |
1200 | + if (!ccsecurity_exports.find_task_by_pid_ns) | |
1201 | + goto out; | |
1202 | + ccsecurity_exports.d_absolute_path = probe_d_absolute_path(); | |
1203 | + if (!ccsecurity_exports.d_absolute_path) | |
1204 | + goto out; | |
1205 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) | |
1206 | + INIT_LIST_HEAD(&ccs_task_security_list[idx]); | |
1207 | + ccs_main_init(); | |
1208 | +#if defined(NEED_TO_CHECK_HOOKS_ARE_WRITABLE) && defined(CONFIG_X86) | |
1209 | + for (idx = 0; idx < ro_pages_len; idx++) | |
1210 | + set_bit(_PAGE_BIT_RW, &(ro_pages[idx]->flags)); | |
1211 | +#endif | |
1212 | + swap_hook(&akari_hooks[0], &original_task_free); | |
1213 | + swap_hook(&akari_hooks[1], &original_cred_prepare); | |
1214 | + swap_hook(&akari_hooks[2], &original_task_alloc); | |
1215 | + for (idx = 3; idx < ARRAY_SIZE(akari_hooks); idx++) | |
1216 | + add_hook(&akari_hooks[idx]); | |
1217 | +#if defined(NEED_TO_CHECK_HOOKS_ARE_WRITABLE) && defined(CONFIG_X86) | |
1218 | + for (idx = 0; idx < ro_pages_len; idx++) | |
1219 | + clear_bit(_PAGE_BIT_RW, &(ro_pages[idx]->flags)); | |
1220 | +#endif | |
1221 | + printk(KERN_INFO "AKARI: 1.0.39 2019/08/20\n"); | |
1222 | + printk(KERN_INFO | |
1223 | + "Access Keeping And Regulating Instrument registered.\n"); | |
1224 | + return 0; | |
1225 | +out: | |
1226 | + return -EINVAL; | |
1227 | +} | |
1228 | + | |
1229 | +module_init(ccs_init); | |
1230 | +MODULE_LICENSE("GPL"); | |
1231 | + | |
1232 | +/** | |
1233 | + * ccs_used_by_cred - Check whether the given domain is in use or not. | |
1234 | + * | |
1235 | + * @domain: Pointer to "struct ccs_domain_info". | |
1236 | + * | |
1237 | + * Returns true if @domain is in use, false otherwise. | |
1238 | + * | |
1239 | + * Caller holds rcu_read_lock(). | |
1240 | + */ | |
1241 | +bool ccs_used_by_cred(const struct ccs_domain_info *domain) | |
1242 | +{ | |
1243 | + return false; | |
1244 | +} | |
1245 | + | |
1246 | +/** | |
1247 | + * ccs_add_task_security - Add "struct ccs_security" to list. | |
1248 | + * | |
1249 | + * @ptr: Pointer to "struct ccs_security". | |
1250 | + * @list: Pointer to "struct list_head". | |
1251 | + * | |
1252 | + * Returns nothing. | |
1253 | + */ | |
1254 | +static void ccs_add_task_security(struct ccs_security *ptr, | |
1255 | + struct list_head *list) | |
1256 | +{ | |
1257 | + unsigned long flags; | |
1258 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
1259 | + list_add_rcu(&ptr->list, list); | |
1260 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
1261 | +} | |
1262 | + | |
1263 | +/** | |
1264 | + * __ccs_alloc_task_security - Allocate memory for new tasks. | |
1265 | + * | |
1266 | + * @task: Pointer to "struct task_struct". | |
1267 | + * | |
1268 | + * Returns 0 on success, negative value otherwise. | |
1269 | + */ | |
1270 | +static int __ccs_alloc_task_security(const struct task_struct *task) | |
1271 | +{ | |
1272 | + struct ccs_security *old_security = ccs_current_security(); | |
1273 | + struct ccs_security *new_security = kzalloc(sizeof(*new_security), | |
1274 | + GFP_KERNEL); | |
1275 | + struct list_head *list = &ccs_task_security_list | |
1276 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
1277 | + if (!new_security) | |
1278 | + return -ENOMEM; | |
1279 | + new_security->task = task; | |
1280 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
1281 | + new_security->ccs_flags = old_security->ccs_flags; | |
1282 | + ccs_add_task_security(new_security, list); | |
1283 | + return 0; | |
1284 | +} | |
1285 | + | |
1286 | +/** | |
1287 | + * ccs_find_task_security - Find "struct ccs_security" for given task. | |
1288 | + * | |
1289 | + * @task: Pointer to "struct task_struct". | |
1290 | + * | |
1291 | + * Returns pointer to "struct ccs_security" on success, &ccs_oom_security on | |
1292 | + * out of memory, &ccs_default_security otherwise. | |
1293 | + * | |
1294 | + * If @task is current thread and "struct ccs_security" for current thread was | |
1295 | + * not found, I try to allocate it. But if allocation failed, current thread | |
1296 | + * will be killed by SIGKILL. Note that if current->pid == 1, sending SIGKILL | |
1297 | + * won't work. | |
1298 | + */ | |
1299 | +struct ccs_security *ccs_find_task_security(const struct task_struct *task) | |
1300 | +{ | |
1301 | + struct ccs_security *ptr; | |
1302 | + struct list_head *list = &ccs_task_security_list | |
1303 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
1304 | + /* Make sure INIT_LIST_HEAD() in ccs_mm_init() takes effect. */ | |
1305 | + while (!list->next) | |
1306 | + smp_rmb(); | |
1307 | + rcu_read_lock(); | |
1308 | + list_for_each_entry_rcu(ptr, list, list) { | |
1309 | + if (ptr->task != task) | |
1310 | + continue; | |
1311 | + rcu_read_unlock(); | |
1312 | + /* | |
1313 | + * Current thread needs to transit from old domain to new | |
1314 | + * domain before do_execve() succeeds in order to check | |
1315 | + * permission for interpreters and environment variables using | |
1316 | + * new domain's ACL rules. The domain transition has to be | |
1317 | + * visible from other CPU in order to allow interactive | |
1318 | + * enforcing mode. Also, the domain transition has to be | |
1319 | + * reverted if do_execve() failed. However, an LSM hook for | |
1320 | + * reverting domain transition is missing. | |
1321 | + * | |
1322 | + * security_prepare_creds() is called from prepare_creds() from | |
1323 | + * prepare_bprm_creds() from do_execve() before setting | |
1324 | + * current->in_execve flag, and current->in_execve flag is | |
1325 | + * cleared by the time next do_execve() request starts. | |
1326 | + * This means that we can emulate the missing LSM hook for | |
1327 | + * reverting domain transition, by calling this function from | |
1328 | + * security_prepare_creds(). | |
1329 | + * | |
1330 | + * If current->in_execve is not set but ptr->ccs_flags has | |
1331 | + * CCS_TASK_IS_IN_EXECVE set, it indicates that do_execve() | |
1332 | + * has failed and reverting domain transition is needed. | |
1333 | + */ | |
1334 | + if (task == current && | |
1335 | + (ptr->ccs_flags & CCS_TASK_IS_IN_EXECVE) && | |
1336 | + !current->in_execve) { | |
1337 | + ccs_debug_trace("1"); | |
1338 | + ccs_clear_execve(-1, ptr); | |
1339 | + } | |
1340 | + return ptr; | |
1341 | + } | |
1342 | + rcu_read_unlock(); | |
1343 | + if (task != current) | |
1344 | + return &ccs_default_security; | |
1345 | + /* Use GFP_ATOMIC because caller may have called rcu_read_lock(). */ | |
1346 | + ptr = kzalloc(sizeof(*ptr), GFP_ATOMIC); | |
1347 | + if (!ptr) { | |
1348 | + printk(KERN_WARNING "Unable to allocate memory for pid=%u\n", | |
1349 | + task->pid); | |
1350 | + send_sig(SIGKILL, current, 0); | |
1351 | + return &ccs_oom_security; | |
1352 | + } | |
1353 | + *ptr = ccs_default_security; | |
1354 | + ptr->task = task; | |
1355 | + ccs_add_task_security(ptr, list); | |
1356 | + return ptr; | |
1357 | +} | |
1358 | + | |
1359 | +/** | |
1360 | + * __ccs_free_task_security - Release memory associated with "struct task_struct". | |
1361 | + * | |
1362 | + * @task: Pointer to "struct task_struct". | |
1363 | + * | |
1364 | + * Returns nothing. | |
1365 | + */ | |
1366 | +static void __ccs_free_task_security(const struct task_struct *task) | |
1367 | +{ | |
1368 | + unsigned long flags; | |
1369 | + struct ccs_security *ptr = ccs_find_task_security(task); | |
1370 | + if (ptr == &ccs_default_security || ptr == &ccs_oom_security) | |
1371 | + return; | |
1372 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
1373 | + list_del_rcu(&ptr->list); | |
1374 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
1375 | + kfree_rcu(ptr, rcu); | |
1376 | +} |
@@ -0,0 +1,1479 @@ | ||
1 | +/* | |
2 | + * lsm.c | |
3 | + * | |
4 | + * Copyright (C) 2010-2015 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | |
5 | + * | |
6 | + * Version: 1.0.39 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include "internal.h" | |
10 | +#include "probe.h" | |
11 | + | |
12 | +/* Prototype definition. */ | |
13 | +static void ccs_task_security_gc(void); | |
14 | +static int ccs_copy_cred_security(const struct cred *new, | |
15 | + const struct cred *old, gfp_t gfp); | |
16 | +static struct ccs_security *ccs_find_cred_security(const struct cred *cred); | |
17 | +static DEFINE_SPINLOCK(ccs_task_security_list_lock); | |
18 | +static atomic_t ccs_in_execve_tasks = ATOMIC_INIT(0); | |
19 | +/* | |
20 | + * List of "struct ccs_security" for "struct pid". | |
21 | + * | |
22 | + * All instances on this list is guaranteed that "struct ccs_security"->pid != | |
23 | + * NULL. Also, instances on this list that are in execve() are guaranteed that | |
24 | + * "struct ccs_security"->cred remembers "struct linux_binprm"->cred with a | |
25 | + * refcount on "struct linux_binprm"->cred. | |
26 | + */ | |
27 | +struct list_head ccs_task_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
28 | +/* | |
29 | + * List of "struct ccs_security" for "struct cred". | |
30 | + * | |
31 | + * Since the number of "struct cred" is nearly equals to the number of | |
32 | + * "struct pid", we allocate hash tables like ccs_task_security_list. | |
33 | + * | |
34 | + * All instances on this list are guaranteed that "struct ccs_security"->pid == | |
35 | + * NULL and "struct ccs_security"->cred != NULL. | |
36 | + */ | |
37 | +static struct list_head ccs_cred_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
38 | + | |
39 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
40 | +static struct ccs_security ccs_oom_security = { | |
41 | + .ccs_domain_info = &ccs_kernel_domain | |
42 | +}; | |
43 | + | |
44 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
45 | +static struct ccs_security ccs_default_security = { | |
46 | + .ccs_domain_info = &ccs_kernel_domain | |
47 | +}; | |
48 | + | |
49 | +/* For exporting variables and functions. */ | |
50 | +struct ccsecurity_exports ccsecurity_exports; | |
51 | +/* Members are updated by loadable kernel module. */ | |
52 | +struct ccsecurity_operations ccsecurity_ops; | |
53 | + | |
54 | +/* Original hooks. */ | |
55 | +static union security_list_options original_cred_prepare; | |
56 | +static union security_list_options original_cred_free; | |
57 | +static union security_list_options original_cred_alloc_blank; | |
58 | + | |
59 | +#ifdef CONFIG_AKARI_TRACE_EXECVE_COUNT | |
60 | + | |
61 | +/** | |
62 | + * ccs_update_ee_counter - Update "struct ccs_execve" counter. | |
63 | + * | |
64 | + * @count: Count to increment or decrement. | |
65 | + * | |
66 | + * Returns updated counter. | |
67 | + */ | |
68 | +static unsigned int ccs_update_ee_counter(int count) | |
69 | +{ | |
70 | + /* Debug counter for detecting "struct ccs_execve" memory leak. */ | |
71 | + static atomic_t ccs_ee_counter = ATOMIC_INIT(0); | |
72 | + return atomic_add_return(count, &ccs_ee_counter); | |
73 | +} | |
74 | + | |
75 | +/** | |
76 | + * ccs_audit_alloc_execve - Audit allocation of "struct ccs_execve". | |
77 | + * | |
78 | + * @ee: Pointer to "struct ccs_execve". | |
79 | + * | |
80 | + * Returns nothing. | |
81 | + */ | |
82 | +void ccs_audit_alloc_execve(const struct ccs_execve * const ee) | |
83 | +{ | |
84 | + printk(KERN_INFO "AKARI: Allocated %p by pid=%u (count=%u)\n", ee, | |
85 | + current->pid, ccs_update_ee_counter(1) - 1); | |
86 | +} | |
87 | + | |
88 | +/** | |
89 | + * ccs_audit_free_execve - Audit release of "struct ccs_execve". | |
90 | + * | |
91 | + * @ee: Pointer to "struct ccs_execve". | |
92 | + * @task: True if released by current task, false otherwise. | |
93 | + * | |
94 | + * Returns nothing. | |
95 | + */ | |
96 | +void ccs_audit_free_execve(const struct ccs_execve * const ee, | |
97 | + const bool is_current) | |
98 | +{ | |
99 | + const unsigned int tmp = ccs_update_ee_counter(-1); | |
100 | + if (is_current) | |
101 | + printk(KERN_INFO "AKARI: Releasing %p by pid=%u (count=%u)\n", | |
102 | + ee, current->pid, tmp); | |
103 | + else | |
104 | + printk(KERN_INFO "AKARI: Releasing %p by kernel (count=%u)\n", | |
105 | + ee, tmp); | |
106 | +} | |
107 | + | |
108 | +#endif | |
109 | + | |
110 | +#if !defined(CONFIG_AKARI_DEBUG) | |
111 | +#define ccs_debug_trace(pos) do { } while (0) | |
112 | +#else | |
113 | +#define ccs_debug_trace(pos) \ | |
114 | + do { \ | |
115 | + static bool done; \ | |
116 | + if (!done) { \ | |
117 | + printk(KERN_INFO \ | |
118 | + "AKARI: Debug trace: " pos " of 4\n"); \ | |
119 | + done = true; \ | |
120 | + } \ | |
121 | + } while (0) | |
122 | +#endif | |
123 | + | |
124 | +/** | |
125 | + * ccs_clear_execve - Release memory used by do_execve(). | |
126 | + * | |
127 | + * @ret: 0 if do_execve() succeeded, negative value otherwise. | |
128 | + * @security: Pointer to "struct ccs_security". | |
129 | + * | |
130 | + * Returns nothing. | |
131 | + */ | |
132 | +static void ccs_clear_execve(int ret, struct ccs_security *security) | |
133 | +{ | |
134 | + struct ccs_execve *ee; | |
135 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
136 | + return; | |
137 | + ee = security->ee; | |
138 | + security->ee = NULL; | |
139 | + if (!ee) | |
140 | + return; | |
141 | + atomic_dec(&ccs_in_execve_tasks); | |
142 | + ccs_finish_execve(ret, ee); | |
143 | +} | |
144 | + | |
145 | +/** | |
146 | + * ccs_rcu_free - RCU callback for releasing "struct ccs_security". | |
147 | + * | |
148 | + * @rcu: Pointer to "struct rcu_head". | |
149 | + * | |
150 | + * Returns nothing. | |
151 | + */ | |
152 | +static void ccs_rcu_free(struct rcu_head *rcu) | |
153 | +{ | |
154 | + struct ccs_security *ptr = container_of(rcu, typeof(*ptr), rcu); | |
155 | + struct ccs_execve *ee = ptr->ee; | |
156 | + /* | |
157 | + * If this security context was associated with "struct pid" and | |
158 | + * ptr->ccs_flags has CCS_TASK_IS_IN_EXECVE set, it indicates that a | |
159 | + * "struct task_struct" associated with this security context exited | |
160 | + * immediately after do_execve() has failed. | |
161 | + */ | |
162 | + if (ptr->pid && (ptr->ccs_flags & CCS_TASK_IS_IN_EXECVE)) { | |
163 | + ccs_debug_trace("1"); | |
164 | + atomic_dec(&ccs_in_execve_tasks); | |
165 | + } | |
166 | + /* | |
167 | + * If this security context was associated with "struct pid", | |
168 | + * drop refcount obtained by get_pid() in ccs_find_task_security(). | |
169 | + */ | |
170 | + if (ptr->pid) { | |
171 | + ccs_debug_trace("2"); | |
172 | + put_pid(ptr->pid); | |
173 | + } | |
174 | + if (ee) { | |
175 | + ccs_debug_trace("3"); | |
176 | + ccs_audit_free_execve(ee, false); | |
177 | + kfree(ee->handler_path); | |
178 | + kfree(ee); | |
179 | + } | |
180 | + kfree(ptr); | |
181 | +} | |
182 | + | |
183 | +/** | |
184 | + * ccs_del_security - Release "struct ccs_security". | |
185 | + * | |
186 | + * @ptr: Pointer to "struct ccs_security". | |
187 | + * | |
188 | + * Returns nothing. | |
189 | + */ | |
190 | +static void ccs_del_security(struct ccs_security *ptr) | |
191 | +{ | |
192 | + unsigned long flags; | |
193 | + if (ptr == &ccs_default_security || ptr == &ccs_oom_security) | |
194 | + return; | |
195 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
196 | + list_del_rcu(&ptr->list); | |
197 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
198 | + call_rcu(&ptr->rcu, ccs_rcu_free); | |
199 | +} | |
200 | + | |
201 | +/** | |
202 | + * ccs_add_cred_security - Add "struct ccs_security" to list. | |
203 | + * | |
204 | + * @ptr: Pointer to "struct ccs_security". | |
205 | + * | |
206 | + * Returns nothing. | |
207 | + */ | |
208 | +static void ccs_add_cred_security(struct ccs_security *ptr) | |
209 | +{ | |
210 | + unsigned long flags; | |
211 | + struct list_head *list = &ccs_cred_security_list | |
212 | + [hash_ptr((void *) ptr->cred, CCS_TASK_SECURITY_HASH_BITS)]; | |
213 | +#ifdef CONFIG_AKARI_DEBUG | |
214 | + if (ptr->pid) | |
215 | + printk(KERN_INFO "AKARI: \"struct ccs_security\"->pid != NULL" | |
216 | + "\n"); | |
217 | +#endif | |
218 | + ptr->pid = NULL; | |
219 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
220 | + list_add_rcu(&ptr->list, list); | |
221 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
222 | +} | |
223 | + | |
224 | +/** | |
225 | + * ccs_task_create - Make snapshot of security context for new task. | |
226 | + * | |
227 | + * @clone_flags: Flags passed to clone(). | |
228 | + * | |
229 | + * Returns 0 on success, negative value otherwise. | |
230 | + */ | |
231 | +static int ccs_task_create(unsigned long clone_flags) | |
232 | +{ | |
233 | + struct ccs_security *old_security; | |
234 | + struct ccs_security *new_security; | |
235 | + struct cred *cred = prepare_creds(); | |
236 | + if (!cred) | |
237 | + return -ENOMEM; | |
238 | + old_security = ccs_find_task_security(current); | |
239 | + new_security = ccs_find_cred_security(cred); | |
240 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
241 | + new_security->ccs_flags = old_security->ccs_flags; | |
242 | + return commit_creds(cred); | |
243 | +} | |
244 | + | |
245 | +/** | |
246 | + * ccs_cred_prepare - Allocate memory for new credentials. | |
247 | + * | |
248 | + * @new: Pointer to "struct cred". | |
249 | + * @old: Pointer to "struct cred". | |
250 | + * @gfp: Memory allocation flags. | |
251 | + * | |
252 | + * Returns 0 on success, negative value otherwise. | |
253 | + */ | |
254 | +static int ccs_cred_prepare(struct cred *new, const struct cred *old, | |
255 | + gfp_t gfp) | |
256 | +{ | |
257 | + int rc1; | |
258 | + /* | |
259 | + * For checking whether reverting domain transition is needed or not. | |
260 | + * | |
261 | + * See ccs_find_task_security() for reason. | |
262 | + */ | |
263 | + if (gfp == GFP_KERNEL) | |
264 | + ccs_find_task_security(current); | |
265 | + rc1 = ccs_copy_cred_security(new, old, gfp); | |
266 | + if (gfp == GFP_KERNEL) | |
267 | + ccs_task_security_gc(); | |
268 | + if (original_cred_prepare.cred_prepare) { | |
269 | + const int rc2 = original_cred_prepare.cred_prepare(new, old, | |
270 | + gfp); | |
271 | + if (rc2) { | |
272 | + ccs_del_security(ccs_find_cred_security(new)); | |
273 | + return rc2; | |
274 | + } | |
275 | + } | |
276 | + return rc1; | |
277 | +} | |
278 | + | |
279 | +/** | |
280 | + * ccs_cred_free - Release memory used by credentials. | |
281 | + * | |
282 | + * @cred: Pointer to "struct cred". | |
283 | + * | |
284 | + * Returns nothing. | |
285 | + */ | |
286 | +static void ccs_cred_free(struct cred *cred) | |
287 | +{ | |
288 | + if (original_cred_free.cred_free) | |
289 | + original_cred_free.cred_free(cred); | |
290 | + ccs_del_security(ccs_find_cred_security(cred)); | |
291 | +} | |
292 | + | |
293 | +/** | |
294 | + * ccs_alloc_cred_security - Allocate memory for new credentials. | |
295 | + * | |
296 | + * @cred: Pointer to "struct cred". | |
297 | + * @gfp: Memory allocation flags. | |
298 | + * | |
299 | + * Returns 0 on success, negative value otherwise. | |
300 | + */ | |
301 | +static int ccs_alloc_cred_security(const struct cred *cred, gfp_t gfp) | |
302 | +{ | |
303 | + struct ccs_security *new_security = kzalloc(sizeof(*new_security), | |
304 | + gfp); | |
305 | + if (!new_security) | |
306 | + return -ENOMEM; | |
307 | + new_security->cred = cred; | |
308 | + ccs_add_cred_security(new_security); | |
309 | + return 0; | |
310 | +} | |
311 | + | |
312 | +/** | |
313 | + * ccs_cred_alloc_blank - Allocate memory for new credentials. | |
314 | + * | |
315 | + * @new: Pointer to "struct cred". | |
316 | + * @gfp: Memory allocation flags. | |
317 | + * | |
318 | + * Returns 0 on success, negative value otherwise. | |
319 | + */ | |
320 | +static int ccs_cred_alloc_blank(struct cred *new, gfp_t gfp) | |
321 | +{ | |
322 | + const int rc1 = ccs_alloc_cred_security(new, gfp); | |
323 | + if (original_cred_alloc_blank.cred_alloc_blank) { | |
324 | + const int rc2 = original_cred_alloc_blank. | |
325 | + cred_alloc_blank(new, gfp); | |
326 | + if (rc2) { | |
327 | + ccs_del_security(ccs_find_cred_security(new)); | |
328 | + return rc2; | |
329 | + } | |
330 | + } | |
331 | + return rc1; | |
332 | +} | |
333 | + | |
334 | +/** | |
335 | + * ccs_cred_transfer - Transfer "struct ccs_security" between credentials. | |
336 | + * | |
337 | + * @new: Pointer to "struct cred". | |
338 | + * @old: Pointer to "struct cred". | |
339 | + * | |
340 | + * Returns nothing. | |
341 | + */ | |
342 | +static void ccs_cred_transfer(struct cred *new, const struct cred *old) | |
343 | +{ | |
344 | + struct ccs_security *new_security = ccs_find_cred_security(new); | |
345 | + struct ccs_security *old_security = ccs_find_cred_security(old); | |
346 | + if (new_security == &ccs_default_security || | |
347 | + new_security == &ccs_oom_security || | |
348 | + old_security == &ccs_default_security || | |
349 | + old_security == &ccs_oom_security) | |
350 | + return; | |
351 | + new_security->ccs_flags = old_security->ccs_flags; | |
352 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
353 | +} | |
354 | + | |
355 | +/** | |
356 | + * ccs_bprm_committing_creds - A hook which is called when do_execve() succeeded. | |
357 | + * | |
358 | + * @bprm: Pointer to "struct linux_binprm". | |
359 | + * | |
360 | + * Returns nothing. | |
361 | + */ | |
362 | +static void ccs_bprm_committing_creds(struct linux_binprm *bprm) | |
363 | +{ | |
364 | + struct ccs_security *old_security = ccs_current_security(); | |
365 | + struct ccs_security *new_security; | |
366 | + if (old_security == &ccs_default_security || | |
367 | + old_security == &ccs_oom_security) | |
368 | + return; | |
369 | + ccs_clear_execve(0, old_security); | |
370 | + /* Update current task's cred's domain for future fork(). */ | |
371 | + new_security = ccs_find_cred_security(bprm->cred); | |
372 | + new_security->ccs_flags = old_security->ccs_flags; | |
373 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
374 | +} | |
375 | + | |
376 | +/** | |
377 | + * ccs_bprm_check_security - Check permission for execve(). | |
378 | + * | |
379 | + * @bprm: Pointer to "struct linux_binprm". | |
380 | + * | |
381 | + * Returns 0 on success, negative value otherwise. | |
382 | + */ | |
383 | +static int ccs_bprm_check_security(struct linux_binprm *bprm) | |
384 | +{ | |
385 | + struct ccs_security *security = ccs_current_security(); | |
386 | + int rc; | |
387 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
388 | + return -ENOMEM; | |
389 | + if (security->ee) | |
390 | + return 0; | |
391 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
392 | + if (!ccs_policy_loaded) | |
393 | + ccs_load_policy(bprm->filename); | |
394 | +#endif | |
395 | + rc = ccs_start_execve(bprm, &security->ee); | |
396 | + if (security->ee) | |
397 | + atomic_inc(&ccs_in_execve_tasks); | |
398 | + return rc; | |
399 | +} | |
400 | + | |
401 | +/** | |
402 | + * ccs_file_open - Check permission for open(). | |
403 | + * | |
404 | + * @f: Pointer to "struct file". | |
405 | + * @cred: Pointer to "struct cred". | |
406 | + * | |
407 | + * Returns 0 on success, negative value otherwise. | |
408 | + */ | |
409 | +static int ccs_file_open(struct file *f, const struct cred *cred) | |
410 | +{ | |
411 | + return ccs_open_permission(f); | |
412 | +} | |
413 | + | |
414 | +#ifdef CONFIG_SECURITY_PATH | |
415 | + | |
416 | +/** | |
417 | + * ccs_path_chown - Check permission for chown()/chgrp(). | |
418 | + * | |
419 | + * @path: Pointer to "struct path". | |
420 | + * @user: User ID. | |
421 | + * @group: Group ID. | |
422 | + * | |
423 | + * Returns 0 on success, negative value otherwise. | |
424 | + */ | |
425 | +static int ccs_path_chown(struct path *path, kuid_t user, kgid_t group) | |
426 | +{ | |
427 | + return ccs_chown_permission(path->dentry, path->mnt, user, group); | |
428 | +} | |
429 | + | |
430 | +/** | |
431 | + * ccs_path_chmod - Check permission for chmod(). | |
432 | + * | |
433 | + * @path: Pointer to "struct path". | |
434 | + * @mode: Mode. | |
435 | + * | |
436 | + * Returns 0 on success, negative value otherwise. | |
437 | + */ | |
438 | +static int ccs_path_chmod(struct path *path, umode_t mode) | |
439 | +{ | |
440 | + return ccs_chmod_permission(path->dentry, path->mnt, mode); | |
441 | +} | |
442 | + | |
443 | +/** | |
444 | + * ccs_path_chroot - Check permission for chroot(). | |
445 | + * | |
446 | + * @path: Pointer to "struct path". | |
447 | + * | |
448 | + * Returns 0 on success, negative value otherwise. | |
449 | + */ | |
450 | +static int ccs_path_chroot(struct path *path) | |
451 | +{ | |
452 | + return ccs_chroot_permission(path); | |
453 | +} | |
454 | + | |
455 | +/** | |
456 | + * ccs_path_truncate - Check permission for truncate(). | |
457 | + * | |
458 | + * @path: Pointer to "struct path". | |
459 | + * | |
460 | + * Returns 0 on success, negative value otherwise. | |
461 | + */ | |
462 | +static int ccs_path_truncate(struct path *path) | |
463 | +{ | |
464 | + return ccs_truncate_permission(path->dentry, path->mnt); | |
465 | +} | |
466 | + | |
467 | +#else | |
468 | + | |
469 | +/** | |
470 | + * ccs_inode_setattr - Check permission for chown()/chgrp()/chmod()/truncate(). | |
471 | + * | |
472 | + * @dentry: Pointer to "struct dentry". | |
473 | + * @attr: Pointer to "struct iattr". | |
474 | + * | |
475 | + * Returns 0 on success, negative value otherwise. | |
476 | + */ | |
477 | +static int ccs_inode_setattr(struct dentry *dentry, struct iattr *attr) | |
478 | +{ | |
479 | + const int rc1 = (attr->ia_valid & ATTR_UID) ? | |
480 | + ccs_chown_permission(dentry, NULL, attr->ia_uid, INVALID_GID) : | |
481 | + 0; | |
482 | + const int rc2 = (attr->ia_valid & ATTR_GID) ? | |
483 | + ccs_chown_permission(dentry, NULL, INVALID_UID, attr->ia_gid) : | |
484 | + 0; | |
485 | + const int rc3 = (attr->ia_valid & ATTR_MODE) ? | |
486 | + ccs_chmod_permission(dentry, NULL, attr->ia_mode) : 0; | |
487 | + const int rc4 = (attr->ia_valid & ATTR_SIZE) ? | |
488 | + ccs_truncate_permission(dentry, NULL) : 0; | |
489 | + if (rc4) | |
490 | + return rc4; | |
491 | + if (rc3) | |
492 | + return rc3; | |
493 | + if (rc2) | |
494 | + return rc2; | |
495 | + return rc1; | |
496 | +} | |
497 | + | |
498 | +#endif | |
499 | + | |
500 | +/** | |
501 | + * ccs_inode_getattr - Check permission for stat(). | |
502 | + * | |
503 | + * @path: Pointer to "struct path". | |
504 | + * | |
505 | + * Returns 0 on success, negative value otherwise. | |
506 | + */ | |
507 | +static int ccs_inode_getattr(const struct path *path) | |
508 | +{ | |
509 | + return ccs_getattr_permission(path->mnt, path->dentry); | |
510 | +} | |
511 | + | |
512 | +#ifdef CONFIG_SECURITY_PATH | |
513 | + | |
514 | +/** | |
515 | + * ccs_path_mknod - Check permission for mknod(). | |
516 | + * | |
517 | + * @dir: Pointer to "struct path". | |
518 | + * @dentry: Pointer to "struct dentry". | |
519 | + * @mode: Create mode. | |
520 | + * @dev: Device major/minor number. | |
521 | + * | |
522 | + * Returns 0 on success, negative value otherwise. | |
523 | + */ | |
524 | +static int ccs_path_mknod(struct path *dir, struct dentry *dentry, | |
525 | + umode_t mode, unsigned int dev) | |
526 | +{ | |
527 | + return ccs_mknod_permission(dentry, dir->mnt, mode, dev); | |
528 | +} | |
529 | + | |
530 | +/** | |
531 | + * ccs_path_mkdir - Check permission for mkdir(). | |
532 | + * | |
533 | + * @dir: Pointer to "struct path". | |
534 | + * @dentry: Pointer to "struct dentry". | |
535 | + * @mode: Create mode. | |
536 | + * | |
537 | + * Returns 0 on success, negative value otherwise. | |
538 | + */ | |
539 | +static int ccs_path_mkdir(struct path *dir, struct dentry *dentry, | |
540 | + umode_t mode) | |
541 | +{ | |
542 | + return ccs_mkdir_permission(dentry, dir->mnt, mode); | |
543 | +} | |
544 | + | |
545 | +/** | |
546 | + * ccs_path_rmdir - Check permission for rmdir(). | |
547 | + * | |
548 | + * @dir: Pointer to "struct path". | |
549 | + * @dentry: Pointer to "struct dentry". | |
550 | + * | |
551 | + * Returns 0 on success, negative value otherwise. | |
552 | + */ | |
553 | +static int ccs_path_rmdir(struct path *dir, struct dentry *dentry) | |
554 | +{ | |
555 | + return ccs_rmdir_permission(dentry, dir->mnt); | |
556 | +} | |
557 | + | |
558 | +/** | |
559 | + * ccs_path_unlink - Check permission for unlink(). | |
560 | + * | |
561 | + * @dir: Pointer to "struct path". | |
562 | + * @dentry: Pointer to "struct dentry". | |
563 | + * | |
564 | + * Returns 0 on success, negative value otherwise. | |
565 | + */ | |
566 | +static int ccs_path_unlink(struct path *dir, struct dentry *dentry) | |
567 | +{ | |
568 | + return ccs_unlink_permission(dentry, dir->mnt); | |
569 | +} | |
570 | + | |
571 | +/** | |
572 | + * ccs_path_symlink - Check permission for symlink(). | |
573 | + * | |
574 | + * @dir: Pointer to "struct path". | |
575 | + * @dentry: Pointer to "struct dentry". | |
576 | + * @old_name: Content of symbolic link. | |
577 | + * | |
578 | + * Returns 0 on success, negative value otherwise. | |
579 | + */ | |
580 | +static int ccs_path_symlink(struct path *dir, struct dentry *dentry, | |
581 | + const char *old_name) | |
582 | +{ | |
583 | + return ccs_symlink_permission(dentry, dir->mnt, old_name); | |
584 | +} | |
585 | + | |
586 | +/** | |
587 | + * ccs_path_rename - Check permission for rename(). | |
588 | + * | |
589 | + * @old_dir: Pointer to "struct path". | |
590 | + * @old_dentry: Pointer to "struct dentry". | |
591 | + * @new_dir: Pointer to "struct path". | |
592 | + * @new_dentry: Pointer to "struct dentry". | |
593 | + * | |
594 | + * Returns 0 on success, negative value otherwise. | |
595 | + */ | |
596 | +static int ccs_path_rename(struct path *old_dir, struct dentry *old_dentry, | |
597 | + struct path *new_dir, struct dentry *new_dentry) | |
598 | +{ | |
599 | + return ccs_rename_permission(old_dentry, new_dentry, old_dir->mnt); | |
600 | +} | |
601 | + | |
602 | +/** | |
603 | + * ccs_path_link - Check permission for link(). | |
604 | + * | |
605 | + * @old_dentry: Pointer to "struct dentry". | |
606 | + * @new_dir: Pointer to "struct path". | |
607 | + * @new_dentry: Pointer to "struct dentry". | |
608 | + * | |
609 | + * Returns 0 on success, negative value otherwise. | |
610 | + */ | |
611 | +static int ccs_path_link(struct dentry *old_dentry, struct path *new_dir, | |
612 | + struct dentry *new_dentry) | |
613 | +{ | |
614 | + return ccs_link_permission(old_dentry, new_dentry, new_dir->mnt); | |
615 | +} | |
616 | + | |
617 | +#else | |
618 | + | |
619 | +/** | |
620 | + * ccs_inode_mknod - Check permission for mknod(). | |
621 | + * | |
622 | + * @dir: Pointer to "struct inode". | |
623 | + * @dentry: Pointer to "struct dentry". | |
624 | + * @mode: Create mode. | |
625 | + * @dev: Device major/minor number. | |
626 | + * | |
627 | + * Returns 0 on success, negative value otherwise. | |
628 | + */ | |
629 | +static int ccs_inode_mknod(struct inode *dir, struct dentry *dentry, | |
630 | + umode_t mode, dev_t dev) | |
631 | +{ | |
632 | + return ccs_mknod_permission(dentry, NULL, mode, dev); | |
633 | +} | |
634 | + | |
635 | +/** | |
636 | + * ccs_inode_mkdir - Check permission for mkdir(). | |
637 | + * | |
638 | + * @dir: Pointer to "struct inode". | |
639 | + * @dentry: Pointer to "struct dentry". | |
640 | + * @mode: Create mode. | |
641 | + * | |
642 | + * Returns 0 on success, negative value otherwise. | |
643 | + */ | |
644 | +static int ccs_inode_mkdir(struct inode *dir, struct dentry *dentry, | |
645 | + umode_t mode) | |
646 | +{ | |
647 | + return ccs_mkdir_permission(dentry, NULL, mode); | |
648 | +} | |
649 | + | |
650 | +/** | |
651 | + * ccs_inode_rmdir - Check permission for rmdir(). | |
652 | + * | |
653 | + * @dir: Pointer to "struct inode". | |
654 | + * @dentry: Pointer to "struct dentry". | |
655 | + * | |
656 | + * Returns 0 on success, negative value otherwise. | |
657 | + */ | |
658 | +static int ccs_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
659 | +{ | |
660 | + return ccs_rmdir_permission(dentry, NULL); | |
661 | +} | |
662 | + | |
663 | +/** | |
664 | + * ccs_inode_unlink - Check permission for unlink(). | |
665 | + * | |
666 | + * @dir: Pointer to "struct inode". | |
667 | + * @dentry: Pointer to "struct dentry". | |
668 | + * | |
669 | + * Returns 0 on success, negative value otherwise. | |
670 | + */ | |
671 | +static int ccs_inode_unlink(struct inode *dir, struct dentry *dentry) | |
672 | +{ | |
673 | + return ccs_unlink_permission(dentry, NULL); | |
674 | +} | |
675 | + | |
676 | +/** | |
677 | + * ccs_inode_symlink - Check permission for symlink(). | |
678 | + * | |
679 | + * @dir: Pointer to "struct inode". | |
680 | + * @dentry: Pointer to "struct dentry". | |
681 | + * @old_name: Content of symbolic link. | |
682 | + * | |
683 | + * Returns 0 on success, negative value otherwise. | |
684 | + */ | |
685 | +static int ccs_inode_symlink(struct inode *dir, struct dentry *dentry, | |
686 | + const char *old_name) | |
687 | +{ | |
688 | + return ccs_symlink_permission(dentry, NULL, old_name); | |
689 | +} | |
690 | + | |
691 | +/** | |
692 | + * ccs_inode_rename - Check permission for rename(). | |
693 | + * | |
694 | + * @old_dir: Pointer to "struct inode". | |
695 | + * @old_dentry: Pointer to "struct dentry". | |
696 | + * @new_dir: Pointer to "struct inode". | |
697 | + * @new_dentry: Pointer to "struct dentry". | |
698 | + * | |
699 | + * Returns 0 on success, negative value otherwise. | |
700 | + */ | |
701 | +static int ccs_inode_rename(struct inode *old_dir, struct dentry *old_dentry, | |
702 | + struct inode *new_dir, struct dentry *new_dentry) | |
703 | +{ | |
704 | + return ccs_rename_permission(old_dentry, new_dentry, NULL); | |
705 | +} | |
706 | + | |
707 | +/** | |
708 | + * ccs_inode_link - Check permission for link(). | |
709 | + * | |
710 | + * @old_dentry: Pointer to "struct dentry". | |
711 | + * @dir: Pointer to "struct inode". | |
712 | + * @new_dentry: Pointer to "struct dentry". | |
713 | + * | |
714 | + * Returns 0 on success, negative value otherwise. | |
715 | + */ | |
716 | +static int ccs_inode_link(struct dentry *old_dentry, struct inode *dir, | |
717 | + struct dentry *new_dentry) | |
718 | +{ | |
719 | + return ccs_link_permission(old_dentry, new_dentry, NULL); | |
720 | +} | |
721 | + | |
722 | +/** | |
723 | + * ccs_inode_create - Check permission for creat(). | |
724 | + * | |
725 | + * @dir: Pointer to "struct inode". | |
726 | + * @dentry: Pointer to "struct dentry". | |
727 | + * @mode: Create mode. | |
728 | + * | |
729 | + * Returns 0 on success, negative value otherwise. | |
730 | + */ | |
731 | +static int ccs_inode_create(struct inode *dir, struct dentry *dentry, | |
732 | + umode_t mode) | |
733 | +{ | |
734 | + return ccs_mknod_permission(dentry, NULL, mode, 0); | |
735 | +} | |
736 | + | |
737 | +#endif | |
738 | + | |
739 | +#ifdef CONFIG_SECURITY_NETWORK | |
740 | + | |
741 | +#include <net/sock.h> | |
742 | + | |
743 | +/* Structure for remembering an accept()ed socket's status. */ | |
744 | +struct ccs_socket_tag { | |
745 | + struct list_head list; | |
746 | + struct inode *inode; | |
747 | + int status; | |
748 | + struct rcu_head rcu; | |
749 | +}; | |
750 | + | |
751 | +/* | |
752 | + * List for managing accept()ed sockets. | |
753 | + * Since we don't need to keep an accept()ed socket into this list after | |
754 | + * once the permission was granted, the number of entries in this list is | |
755 | + * likely small. Therefore, we don't use hash tables. | |
756 | + */ | |
757 | +static LIST_HEAD(ccs_accepted_socket_list); | |
758 | +/* Lock for protecting ccs_accepted_socket_list . */ | |
759 | +static DEFINE_SPINLOCK(ccs_accepted_socket_list_lock); | |
760 | + | |
761 | +/** | |
762 | + * ccs_update_socket_tag - Update tag associated with accept()ed sockets. | |
763 | + * | |
764 | + * @inode: Pointer to "struct inode". | |
765 | + * @status: New status. | |
766 | + * | |
767 | + * Returns nothing. | |
768 | + * | |
769 | + * If @status == 0, memory for that socket will be released after RCU grace | |
770 | + * period. | |
771 | + */ | |
772 | +static void ccs_update_socket_tag(struct inode *inode, int status) | |
773 | +{ | |
774 | + struct ccs_socket_tag *ptr; | |
775 | + /* | |
776 | + * Protect whole section because multiple threads may call this | |
777 | + * function with same "sock" via ccs_validate_socket(). | |
778 | + */ | |
779 | + spin_lock(&ccs_accepted_socket_list_lock); | |
780 | + rcu_read_lock(); | |
781 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
782 | + if (ptr->inode != inode) | |
783 | + continue; | |
784 | + ptr->status = status; | |
785 | + if (status) | |
786 | + break; | |
787 | + list_del_rcu(&ptr->list); | |
788 | + kfree_rcu(ptr, rcu); | |
789 | + break; | |
790 | + } | |
791 | + rcu_read_unlock(); | |
792 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
793 | +} | |
794 | + | |
795 | +/** | |
796 | + * ccs_validate_socket - Check post accept() permission if needed. | |
797 | + * | |
798 | + * @sock: Pointer to "struct socket". | |
799 | + * | |
800 | + * Returns 0 on success, negative value otherwise. | |
801 | + */ | |
802 | +static int ccs_validate_socket(struct socket *sock) | |
803 | +{ | |
804 | + struct inode *inode = SOCK_INODE(sock); | |
805 | + struct ccs_socket_tag *ptr; | |
806 | + int ret = 0; | |
807 | + rcu_read_lock(); | |
808 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
809 | + if (ptr->inode != inode) | |
810 | + continue; | |
811 | + ret = ptr->status; | |
812 | + break; | |
813 | + } | |
814 | + rcu_read_unlock(); | |
815 | + if (ret <= 0) | |
816 | + /* | |
817 | + * This socket is not an accept()ed socket or this socket is | |
818 | + * an accept()ed socket and post accept() permission is done. | |
819 | + */ | |
820 | + return ret; | |
821 | + /* | |
822 | + * Check post accept() permission now. | |
823 | + * | |
824 | + * Strictly speaking, we need to pass both listen()ing socket and | |
825 | + * accept()ed socket to __ccs_socket_post_accept_permission(). | |
826 | + * But since socket's family and type are same for both sockets, | |
827 | + * passing the accept()ed socket in place for the listen()ing socket | |
828 | + * will work. | |
829 | + */ | |
830 | + ret = ccs_socket_post_accept_permission(sock, sock); | |
831 | + /* | |
832 | + * If permission was granted, we forget that this is an accept()ed | |
833 | + * socket. Otherwise, we remember that this socket needs to return | |
834 | + * error for subsequent socketcalls. | |
835 | + */ | |
836 | + ccs_update_socket_tag(inode, ret); | |
837 | + return ret; | |
838 | +} | |
839 | + | |
840 | +/** | |
841 | + * ccs_socket_accept - Check permission for accept(). | |
842 | + * | |
843 | + * @sock: Pointer to "struct socket". | |
844 | + * @newsock: Pointer to "struct socket". | |
845 | + * | |
846 | + * Returns 0 on success, negative value otherwise. | |
847 | + * | |
848 | + * This hook is used for setting up environment for doing post accept() | |
849 | + * permission check. If dereferencing sock->ops->something() were ordered by | |
850 | + * rcu_dereference(), we could replace sock->ops with "a copy of original | |
851 | + * sock->ops with modified sock->ops->accept()" using rcu_assign_pointer() | |
852 | + * in order to do post accept() permission check before returning to userspace. | |
853 | + * If we make the copy in security_socket_post_create(), it would be possible | |
854 | + * to safely replace sock->ops here, but we don't do so because we don't want | |
855 | + * to allocate memory for sockets which do not call sock->ops->accept(). | |
856 | + * Therefore, we do post accept() permission check upon next socket syscalls | |
857 | + * rather than between sock->ops->accept() and returning to userspace. | |
858 | + * This means that if a socket was close()d before calling some socket | |
859 | + * syscalls, post accept() permission check will not be done. | |
860 | + */ | |
861 | +static int ccs_socket_accept(struct socket *sock, struct socket *newsock) | |
862 | +{ | |
863 | + struct ccs_socket_tag *ptr; | |
864 | + const int rc = ccs_validate_socket(sock); | |
865 | + if (rc < 0) | |
866 | + return rc; | |
867 | + ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); | |
868 | + if (!ptr) | |
869 | + return -ENOMEM; | |
870 | + /* | |
871 | + * Subsequent LSM hooks will receive "newsock". Therefore, I mark | |
872 | + * "newsock" as "an accept()ed socket but post accept() permission | |
873 | + * check is not done yet" by allocating memory using inode of the | |
874 | + * "newsock" as a search key. | |
875 | + */ | |
876 | + ptr->inode = SOCK_INODE(newsock); | |
877 | + ptr->status = 1; /* Check post accept() permission later. */ | |
878 | + spin_lock(&ccs_accepted_socket_list_lock); | |
879 | + list_add_tail_rcu(&ptr->list, &ccs_accepted_socket_list); | |
880 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
881 | + return 0; | |
882 | +} | |
883 | + | |
884 | +/** | |
885 | + * ccs_socket_listen - Check permission for listen(). | |
886 | + * | |
887 | + * @sock: Pointer to "struct socket". | |
888 | + * @backlog: Backlog parameter. | |
889 | + * | |
890 | + * Returns 0 on success, negative value otherwise. | |
891 | + */ | |
892 | +static int ccs_socket_listen(struct socket *sock, int backlog) | |
893 | +{ | |
894 | + const int rc = ccs_validate_socket(sock); | |
895 | + if (rc < 0) | |
896 | + return rc; | |
897 | + return ccs_socket_listen_permission(sock); | |
898 | +} | |
899 | + | |
900 | +/** | |
901 | + * ccs_socket_connect - Check permission for connect(). | |
902 | + * | |
903 | + * @sock: Pointer to "struct socket". | |
904 | + * @addr: Pointer to "struct sockaddr". | |
905 | + * @addr_len: Size of @addr. | |
906 | + * | |
907 | + * Returns 0 on success, negative value otherwise. | |
908 | + */ | |
909 | +static int ccs_socket_connect(struct socket *sock, struct sockaddr *addr, | |
910 | + int addr_len) | |
911 | +{ | |
912 | + const int rc = ccs_validate_socket(sock); | |
913 | + if (rc < 0) | |
914 | + return rc; | |
915 | + return ccs_socket_connect_permission(sock, addr, addr_len); | |
916 | +} | |
917 | + | |
918 | +/** | |
919 | + * ccs_socket_bind - Check permission for bind(). | |
920 | + * | |
921 | + * @sock: Pointer to "struct socket". | |
922 | + * @addr: Pointer to "struct sockaddr". | |
923 | + * @addr_len: Size of @addr. | |
924 | + * | |
925 | + * Returns 0 on success, negative value otherwise. | |
926 | + */ | |
927 | +static int ccs_socket_bind(struct socket *sock, struct sockaddr *addr, | |
928 | + int addr_len) | |
929 | +{ | |
930 | + const int rc = ccs_validate_socket(sock); | |
931 | + if (rc < 0) | |
932 | + return rc; | |
933 | + return ccs_socket_bind_permission(sock, addr, addr_len); | |
934 | +} | |
935 | + | |
936 | +/** | |
937 | + * ccs_socket_sendmsg - Check permission for sendmsg(). | |
938 | + * | |
939 | + * @sock: Pointer to "struct socket". | |
940 | + * @msg: Pointer to "struct msghdr". | |
941 | + * @size: Size of message. | |
942 | + * | |
943 | + * Returns 0 on success, negative value otherwise. | |
944 | + */ | |
945 | +static int ccs_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
946 | + int size) | |
947 | +{ | |
948 | + const int rc = ccs_validate_socket(sock); | |
949 | + if (rc < 0) | |
950 | + return rc; | |
951 | + return ccs_socket_sendmsg_permission(sock, msg, size); | |
952 | +} | |
953 | + | |
954 | +/** | |
955 | + * ccs_socket_recvmsg - Check permission for recvmsg(). | |
956 | + * | |
957 | + * @sock: Pointer to "struct socket". | |
958 | + * @msg: Pointer to "struct msghdr". | |
959 | + * @size: Size of message. | |
960 | + * @flags: Flags. | |
961 | + * | |
962 | + * Returns 0 on success, negative value otherwise. | |
963 | + */ | |
964 | +static int ccs_socket_recvmsg(struct socket *sock, struct msghdr *msg, | |
965 | + int size, int flags) | |
966 | +{ | |
967 | + return ccs_validate_socket(sock); | |
968 | +} | |
969 | + | |
970 | +/** | |
971 | + * ccs_socket_getsockname - Check permission for getsockname(). | |
972 | + * | |
973 | + * @sock: Pointer to "struct socket". | |
974 | + * | |
975 | + * Returns 0 on success, negative value otherwise. | |
976 | + */ | |
977 | +static int ccs_socket_getsockname(struct socket *sock) | |
978 | +{ | |
979 | + return ccs_validate_socket(sock); | |
980 | +} | |
981 | + | |
982 | +/** | |
983 | + * ccs_socket_getpeername - Check permission for getpeername(). | |
984 | + * | |
985 | + * @sock: Pointer to "struct socket". | |
986 | + * | |
987 | + * Returns 0 on success, negative value otherwise. | |
988 | + */ | |
989 | +static int ccs_socket_getpeername(struct socket *sock) | |
990 | +{ | |
991 | + return ccs_validate_socket(sock); | |
992 | +} | |
993 | + | |
994 | +/** | |
995 | + * ccs_socket_getsockopt - Check permission for getsockopt(). | |
996 | + * | |
997 | + * @sock: Pointer to "struct socket". | |
998 | + * @level: Level. | |
999 | + * @optname: Option's name, | |
1000 | + * | |
1001 | + * Returns 0 on success, negative value otherwise. | |
1002 | + */ | |
1003 | +static int ccs_socket_getsockopt(struct socket *sock, int level, int optname) | |
1004 | +{ | |
1005 | + return ccs_validate_socket(sock); | |
1006 | +} | |
1007 | + | |
1008 | +/** | |
1009 | + * ccs_socket_setsockopt - Check permission for setsockopt(). | |
1010 | + * | |
1011 | + * @sock: Pointer to "struct socket". | |
1012 | + * @level: Level. | |
1013 | + * @optname: Option's name, | |
1014 | + * | |
1015 | + * Returns 0 on success, negative value otherwise. | |
1016 | + */ | |
1017 | +static int ccs_socket_setsockopt(struct socket *sock, int level, int optname) | |
1018 | +{ | |
1019 | + return ccs_validate_socket(sock); | |
1020 | +} | |
1021 | + | |
1022 | +/** | |
1023 | + * ccs_socket_shutdown - Check permission for shutdown(). | |
1024 | + * | |
1025 | + * @sock: Pointer to "struct socket". | |
1026 | + * @how: Shutdown mode. | |
1027 | + * | |
1028 | + * Returns 0 on success, negative value otherwise. | |
1029 | + */ | |
1030 | +static int ccs_socket_shutdown(struct socket *sock, int how) | |
1031 | +{ | |
1032 | + return ccs_validate_socket(sock); | |
1033 | +} | |
1034 | + | |
1035 | +#define SOCKFS_MAGIC 0x534F434B | |
1036 | + | |
1037 | +/** | |
1038 | + * ccs_inode_free_security - Release memory associated with an inode. | |
1039 | + * | |
1040 | + * @inode: Pointer to "struct inode". | |
1041 | + * | |
1042 | + * Returns nothing. | |
1043 | + * | |
1044 | + * We use this hook for releasing memory associated with an accept()ed socket. | |
1045 | + */ | |
1046 | +static void ccs_inode_free_security(struct inode *inode) | |
1047 | +{ | |
1048 | + if (inode->i_sb && inode->i_sb->s_magic == SOCKFS_MAGIC) | |
1049 | + ccs_update_socket_tag(inode, 0); | |
1050 | +} | |
1051 | + | |
1052 | +#endif | |
1053 | + | |
1054 | +/** | |
1055 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
1056 | + * | |
1057 | + * @old_path: Pointer to "struct path". | |
1058 | + * @new_path: Pointer to "struct path". | |
1059 | + * | |
1060 | + * Returns 0 on success, negative value otherwise. | |
1061 | + */ | |
1062 | +static int ccs_sb_pivotroot(struct path *old_path, struct path *new_path) | |
1063 | +{ | |
1064 | + return ccs_pivot_root_permission(old_path, new_path); | |
1065 | +} | |
1066 | + | |
1067 | +/** | |
1068 | + * ccs_sb_mount - Check permission for mount(). | |
1069 | + * | |
1070 | + * @dev_name: Name of device file. | |
1071 | + * @path: Pointer to "struct path". | |
1072 | + * @type: Name of filesystem type. Maybe NULL. | |
1073 | + * @flags: Mount options. | |
1074 | + * @data_page: Optional data. Maybe NULL. | |
1075 | + * | |
1076 | + * Returns 0 on success, negative value otherwise. | |
1077 | + */ | |
1078 | +static int ccs_sb_mount(const char *dev_name, struct path *path, | |
1079 | + const char *type, unsigned long flags, void *data_page) | |
1080 | +{ | |
1081 | + return ccs_mount_permission(dev_name, path, type, flags, data_page); | |
1082 | +} | |
1083 | + | |
1084 | +/** | |
1085 | + * ccs_sb_umount - Check permission for umount(). | |
1086 | + * | |
1087 | + * @mnt: Pointer to "struct vfsmount". | |
1088 | + * @flags: Unmount flags. | |
1089 | + * | |
1090 | + * Returns 0 on success, negative value otherwise. | |
1091 | + */ | |
1092 | +static int ccs_sb_umount(struct vfsmount *mnt, int flags) | |
1093 | +{ | |
1094 | + return ccs_umount_permission(mnt, flags); | |
1095 | +} | |
1096 | + | |
1097 | +/** | |
1098 | + * ccs_file_fcntl - Check permission for fcntl(). | |
1099 | + * | |
1100 | + * @file: Pointer to "struct file". | |
1101 | + * @cmd: Command number. | |
1102 | + * @arg: Value for @cmd. | |
1103 | + * | |
1104 | + * Returns 0 on success, negative value otherwise. | |
1105 | + */ | |
1106 | +static int ccs_file_fcntl(struct file *file, unsigned int cmd, | |
1107 | + unsigned long arg) | |
1108 | +{ | |
1109 | + return ccs_fcntl_permission(file, cmd, arg); | |
1110 | +} | |
1111 | + | |
1112 | +/** | |
1113 | + * ccs_file_ioctl - Check permission for ioctl(). | |
1114 | + * | |
1115 | + * @filp: Pointer to "struct file". | |
1116 | + * @cmd: Command number. | |
1117 | + * @arg: Value for @cmd. | |
1118 | + * | |
1119 | + * Returns 0 on success, negative value otherwise. | |
1120 | + */ | |
1121 | +static int ccs_file_ioctl(struct file *filp, unsigned int cmd, | |
1122 | + unsigned long arg) | |
1123 | +{ | |
1124 | + return ccs_ioctl_permission(filp, cmd, arg); | |
1125 | +} | |
1126 | + | |
1127 | +#define MY_HOOK_INIT(HEAD, HOOK) \ | |
1128 | + { .head = &probe_dummy_security_hook_heads.HEAD, \ | |
1129 | + .hook = { .HEAD = HOOK } } | |
1130 | + | |
1131 | +static struct security_hook_list akari_hooks[] = { | |
1132 | + /* Security context allocator. */ | |
1133 | + MY_HOOK_INIT(cred_free, ccs_cred_free), | |
1134 | + MY_HOOK_INIT(cred_prepare, ccs_cred_prepare), | |
1135 | + MY_HOOK_INIT(cred_alloc_blank, ccs_cred_alloc_blank), | |
1136 | + MY_HOOK_INIT(cred_transfer, ccs_cred_transfer), | |
1137 | + MY_HOOK_INIT(task_create, ccs_task_create), | |
1138 | + /* Security context updater for successful execve(). */ | |
1139 | + MY_HOOK_INIT(bprm_check_security, ccs_bprm_check_security), | |
1140 | + MY_HOOK_INIT(bprm_committing_creds, ccs_bprm_committing_creds), | |
1141 | + /* Various permission checker. */ | |
1142 | + MY_HOOK_INIT(file_open, ccs_file_open), | |
1143 | + MY_HOOK_INIT(file_fcntl, ccs_file_fcntl), | |
1144 | + MY_HOOK_INIT(file_ioctl, ccs_file_ioctl), | |
1145 | + MY_HOOK_INIT(sb_pivotroot, ccs_sb_pivotroot), | |
1146 | + MY_HOOK_INIT(sb_mount, ccs_sb_mount), | |
1147 | + MY_HOOK_INIT(sb_umount, ccs_sb_umount), | |
1148 | +#ifdef CONFIG_SECURITY_PATH | |
1149 | + MY_HOOK_INIT(path_mknod, ccs_path_mknod), | |
1150 | + MY_HOOK_INIT(path_mkdir, ccs_path_mkdir), | |
1151 | + MY_HOOK_INIT(path_rmdir, ccs_path_rmdir), | |
1152 | + MY_HOOK_INIT(path_unlink, ccs_path_unlink), | |
1153 | + MY_HOOK_INIT(path_symlink, ccs_path_symlink), | |
1154 | + MY_HOOK_INIT(path_rename, ccs_path_rename), | |
1155 | + MY_HOOK_INIT(path_link, ccs_path_link), | |
1156 | + MY_HOOK_INIT(path_truncate, ccs_path_truncate), | |
1157 | + MY_HOOK_INIT(path_chmod, ccs_path_chmod), | |
1158 | + MY_HOOK_INIT(path_chown, ccs_path_chown), | |
1159 | + MY_HOOK_INIT(path_chroot, ccs_path_chroot), | |
1160 | +#else | |
1161 | + MY_HOOK_INIT(inode_mknod, ccs_inode_mknod), | |
1162 | + MY_HOOK_INIT(inode_mkdir, ccs_inode_mkdir), | |
1163 | + MY_HOOK_INIT(inode_rmdir, ccs_inode_rmdir), | |
1164 | + MY_HOOK_INIT(inode_unlink, ccs_inode_unlink), | |
1165 | + MY_HOOK_INIT(inode_symlink, ccs_inode_symlink), | |
1166 | + MY_HOOK_INIT(inode_rename, ccs_inode_rename), | |
1167 | + MY_HOOK_INIT(inode_link, ccs_inode_link), | |
1168 | + MY_HOOK_INIT(inode_create, ccs_inode_create), | |
1169 | + MY_HOOK_INIT(inode_setattr, ccs_inode_setattr), | |
1170 | +#endif | |
1171 | + MY_HOOK_INIT(inode_getattr, ccs_inode_getattr), | |
1172 | +#ifdef CONFIG_SECURITY_NETWORK | |
1173 | + MY_HOOK_INIT(socket_bind, ccs_socket_bind), | |
1174 | + MY_HOOK_INIT(socket_connect, ccs_socket_connect), | |
1175 | + MY_HOOK_INIT(socket_listen, ccs_socket_listen), | |
1176 | + MY_HOOK_INIT(socket_sendmsg, ccs_socket_sendmsg), | |
1177 | + MY_HOOK_INIT(socket_recvmsg, ccs_socket_recvmsg), | |
1178 | + MY_HOOK_INIT(socket_getsockname, ccs_socket_getsockname), | |
1179 | + MY_HOOK_INIT(socket_getpeername, ccs_socket_getpeername), | |
1180 | + MY_HOOK_INIT(socket_getsockopt, ccs_socket_getsockopt), | |
1181 | + MY_HOOK_INIT(socket_setsockopt, ccs_socket_setsockopt), | |
1182 | + MY_HOOK_INIT(socket_shutdown, ccs_socket_shutdown), | |
1183 | + MY_HOOK_INIT(socket_accept, ccs_socket_accept), | |
1184 | + MY_HOOK_INIT(inode_free_security, ccs_inode_free_security), | |
1185 | +#endif | |
1186 | +}; | |
1187 | + | |
1188 | +static inline void add_hook(struct security_hook_list *hook) | |
1189 | +{ | |
1190 | + list_add_tail_rcu(&hook->list, hook->head); | |
1191 | +} | |
1192 | + | |
1193 | +static void __init swap_hook(struct security_hook_list *hook, | |
1194 | + union security_list_options *original) | |
1195 | +{ | |
1196 | + struct list_head *list = hook->head; | |
1197 | + if (list_empty(list)) { | |
1198 | + add_hook(hook); | |
1199 | + } else { | |
1200 | + struct security_hook_list *shp = | |
1201 | + list_last_entry(list, struct security_hook_list, list); | |
1202 | + *original = shp->hook; | |
1203 | + smp_wmb(); | |
1204 | + shp->hook = hook->hook; | |
1205 | + } | |
1206 | +} | |
1207 | + | |
1208 | +/** | |
1209 | + * ccs_init - Initialize this module. | |
1210 | + * | |
1211 | + * Returns 0 on success, negative value otherwise. | |
1212 | + */ | |
1213 | +static int __init ccs_init(void) | |
1214 | +{ | |
1215 | + int idx; | |
1216 | + struct security_hook_heads *hooks = probe_security_hook_heads(); | |
1217 | + if (!hooks) | |
1218 | + goto out; | |
1219 | + for (idx = 0; idx < ARRAY_SIZE(akari_hooks); idx++) | |
1220 | + akari_hooks[idx].head = ((void *) hooks) | |
1221 | + + ((unsigned long) akari_hooks[idx].head) | |
1222 | + - ((unsigned long) &probe_dummy_security_hook_heads); | |
1223 | + ccsecurity_exports.find_task_by_vpid = probe_find_task_by_vpid(); | |
1224 | + if (!ccsecurity_exports.find_task_by_vpid) | |
1225 | + goto out; | |
1226 | + ccsecurity_exports.find_task_by_pid_ns = probe_find_task_by_pid_ns(); | |
1227 | + if (!ccsecurity_exports.find_task_by_pid_ns) | |
1228 | + goto out; | |
1229 | + ccsecurity_exports.d_absolute_path = probe_d_absolute_path(); | |
1230 | + if (!ccsecurity_exports.d_absolute_path) | |
1231 | + goto out; | |
1232 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) { | |
1233 | + INIT_LIST_HEAD(&ccs_cred_security_list[idx]); | |
1234 | + INIT_LIST_HEAD(&ccs_task_security_list[idx]); | |
1235 | + } | |
1236 | + ccs_main_init(); | |
1237 | + swap_hook(&akari_hooks[0], &original_cred_free); | |
1238 | + swap_hook(&akari_hooks[1], &original_cred_prepare); | |
1239 | + swap_hook(&akari_hooks[2], &original_cred_alloc_blank); | |
1240 | + for (idx = 3; idx < ARRAY_SIZE(akari_hooks); idx++) | |
1241 | + add_hook(&akari_hooks[idx]); | |
1242 | + printk(KERN_INFO "AKARI: 1.0.39 2019/08/20\n"); | |
1243 | + printk(KERN_INFO | |
1244 | + "Access Keeping And Regulating Instrument registered.\n"); | |
1245 | + return 0; | |
1246 | +out: | |
1247 | + return -EINVAL; | |
1248 | +} | |
1249 | + | |
1250 | +module_init(ccs_init); | |
1251 | +MODULE_LICENSE("GPL"); | |
1252 | + | |
1253 | +/** | |
1254 | + * ccs_used_by_cred - Check whether the given domain is in use or not. | |
1255 | + * | |
1256 | + * @domain: Pointer to "struct ccs_domain_info". | |
1257 | + * | |
1258 | + * Returns true if @domain is in use, false otherwise. | |
1259 | + * | |
1260 | + * Caller holds rcu_read_lock(). | |
1261 | + */ | |
1262 | +bool ccs_used_by_cred(const struct ccs_domain_info *domain) | |
1263 | +{ | |
1264 | + int idx; | |
1265 | + struct ccs_security *ptr; | |
1266 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) { | |
1267 | + struct list_head *list = &ccs_cred_security_list[idx]; | |
1268 | + list_for_each_entry_rcu(ptr, list, list) { | |
1269 | + struct ccs_execve *ee = ptr->ee; | |
1270 | + if (ptr->ccs_domain_info == domain || | |
1271 | + (ee && ee->previous_domain == domain)) { | |
1272 | + return true; | |
1273 | + } | |
1274 | + } | |
1275 | + } | |
1276 | + return false; | |
1277 | +} | |
1278 | + | |
1279 | +/** | |
1280 | + * ccs_add_task_security - Add "struct ccs_security" to list. | |
1281 | + * | |
1282 | + * @ptr: Pointer to "struct ccs_security". | |
1283 | + * @list: Pointer to "struct list_head". | |
1284 | + * | |
1285 | + * Returns nothing. | |
1286 | + */ | |
1287 | +static void ccs_add_task_security(struct ccs_security *ptr, | |
1288 | + struct list_head *list) | |
1289 | +{ | |
1290 | + unsigned long flags; | |
1291 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
1292 | + list_add_rcu(&ptr->list, list); | |
1293 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
1294 | +} | |
1295 | + | |
1296 | +/** | |
1297 | + * ccs_find_task_security - Find "struct ccs_security" for given task. | |
1298 | + * | |
1299 | + * @task: Pointer to "struct task_struct". | |
1300 | + * | |
1301 | + * Returns pointer to "struct ccs_security" on success, &ccs_oom_security on | |
1302 | + * out of memory, &ccs_default_security otherwise. | |
1303 | + * | |
1304 | + * If @task is current thread and "struct ccs_security" for current thread was | |
1305 | + * not found, I try to allocate it. But if allocation failed, current thread | |
1306 | + * will be killed by SIGKILL. Note that if current->pid == 1, sending SIGKILL | |
1307 | + * won't work. | |
1308 | + */ | |
1309 | +struct ccs_security *ccs_find_task_security(const struct task_struct *task) | |
1310 | +{ | |
1311 | + struct ccs_security *ptr; | |
1312 | + struct list_head *list = &ccs_task_security_list | |
1313 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
1314 | + /* Make sure INIT_LIST_HEAD() in ccs_mm_init() takes effect. */ | |
1315 | + while (!list->next) | |
1316 | + smp_rmb(); | |
1317 | + rcu_read_lock(); | |
1318 | + list_for_each_entry_rcu(ptr, list, list) { | |
1319 | + if (ptr->pid != task->pids[PIDTYPE_PID].pid) | |
1320 | + continue; | |
1321 | + rcu_read_unlock(); | |
1322 | + /* | |
1323 | + * Current thread needs to transit from old domain to new | |
1324 | + * domain before do_execve() succeeds in order to check | |
1325 | + * permission for interpreters and environment variables using | |
1326 | + * new domain's ACL rules. The domain transition has to be | |
1327 | + * visible from other CPU in order to allow interactive | |
1328 | + * enforcing mode. Also, the domain transition has to be | |
1329 | + * reverted if do_execve() failed. However, an LSM hook for | |
1330 | + * reverting domain transition is missing. | |
1331 | + * | |
1332 | + * security_prepare_creds() is called from prepare_creds() from | |
1333 | + * prepare_bprm_creds() from do_execve() before setting | |
1334 | + * current->in_execve flag, and current->in_execve flag is | |
1335 | + * cleared by the time next do_execve() request starts. | |
1336 | + * This means that we can emulate the missing LSM hook for | |
1337 | + * reverting domain transition, by calling this function from | |
1338 | + * security_prepare_creds(). | |
1339 | + * | |
1340 | + * If current->in_execve is not set but ptr->ccs_flags has | |
1341 | + * CCS_TASK_IS_IN_EXECVE set, it indicates that do_execve() | |
1342 | + * has failed and reverting domain transition is needed. | |
1343 | + */ | |
1344 | + if (task == current && | |
1345 | + (ptr->ccs_flags & CCS_TASK_IS_IN_EXECVE) && | |
1346 | + !current->in_execve) { | |
1347 | + ccs_debug_trace("4"); | |
1348 | + ccs_clear_execve(-1, ptr); | |
1349 | + } | |
1350 | + return ptr; | |
1351 | + } | |
1352 | + rcu_read_unlock(); | |
1353 | + if (task != current) { | |
1354 | + /* | |
1355 | + * If a thread does nothing after fork(), caller will reach | |
1356 | + * here because "struct ccs_security" for that thread is not | |
1357 | + * yet allocated. But that thread is keeping a snapshot of | |
1358 | + * "struct ccs_security" taken as of ccs_task_create() | |
1359 | + * associated with that thread's "struct cred". | |
1360 | + * | |
1361 | + * Since that snapshot will be used as initial data when that | |
1362 | + * thread allocates "struct ccs_security" for that thread, we | |
1363 | + * can return that snapshot rather than &ccs_default_security. | |
1364 | + * | |
1365 | + * Since this function is called by only ccs_select_one() and | |
1366 | + * ccs_read_pid() (via ccs_task_domain() and ccs_task_flags()), | |
1367 | + * it is guaranteed that caller has called rcu_read_lock() | |
1368 | + * (via ccs_tasklist_lock()) before finding this thread and | |
1369 | + * this thread is valid. Therefore, we can do __task_cred(task) | |
1370 | + * like get_robust_list() does. | |
1371 | + */ | |
1372 | + return ccs_find_cred_security(__task_cred(task)); | |
1373 | + } | |
1374 | + /* Use GFP_ATOMIC because caller may have called rcu_read_lock(). */ | |
1375 | + ptr = kzalloc(sizeof(*ptr), GFP_ATOMIC); | |
1376 | + if (!ptr) { | |
1377 | + printk(KERN_WARNING "Unable to allocate memory for pid=%u\n", | |
1378 | + task->pid); | |
1379 | + send_sig(SIGKILL, current, 0); | |
1380 | + return &ccs_oom_security; | |
1381 | + } | |
1382 | + *ptr = *ccs_find_cred_security(task->cred); | |
1383 | + /* We can shortcut because task == current. */ | |
1384 | + ptr->pid = get_pid(((struct task_struct *) task)-> | |
1385 | + pids[PIDTYPE_PID].pid); | |
1386 | + ptr->cred = NULL; | |
1387 | + ccs_add_task_security(ptr, list); | |
1388 | + return ptr; | |
1389 | +} | |
1390 | + | |
1391 | +/** | |
1392 | + * ccs_copy_cred_security - Allocate memory for new credentials. | |
1393 | + * | |
1394 | + * @new: Pointer to "struct cred". | |
1395 | + * @old: Pointer to "struct cred". | |
1396 | + * @gfp: Memory allocation flags. | |
1397 | + * | |
1398 | + * Returns 0 on success, negative value otherwise. | |
1399 | + */ | |
1400 | +static int ccs_copy_cred_security(const struct cred *new, | |
1401 | + const struct cred *old, gfp_t gfp) | |
1402 | +{ | |
1403 | + struct ccs_security *old_security = ccs_find_cred_security(old); | |
1404 | + struct ccs_security *new_security = | |
1405 | + kzalloc(sizeof(*new_security), gfp); | |
1406 | + if (!new_security) | |
1407 | + return -ENOMEM; | |
1408 | + *new_security = *old_security; | |
1409 | + new_security->cred = new; | |
1410 | + ccs_add_cred_security(new_security); | |
1411 | + return 0; | |
1412 | +} | |
1413 | + | |
1414 | +/** | |
1415 | + * ccs_find_cred_security - Find "struct ccs_security" for given credential. | |
1416 | + * | |
1417 | + * @cred: Pointer to "struct cred". | |
1418 | + * | |
1419 | + * Returns pointer to "struct ccs_security" on success, &ccs_default_security | |
1420 | + * otherwise. | |
1421 | + */ | |
1422 | +static struct ccs_security *ccs_find_cred_security(const struct cred *cred) | |
1423 | +{ | |
1424 | + struct ccs_security *ptr; | |
1425 | + struct list_head *list = &ccs_cred_security_list | |
1426 | + [hash_ptr((void *) cred, CCS_TASK_SECURITY_HASH_BITS)]; | |
1427 | + rcu_read_lock(); | |
1428 | + list_for_each_entry_rcu(ptr, list, list) { | |
1429 | + if (ptr->cred != cred) | |
1430 | + continue; | |
1431 | + rcu_read_unlock(); | |
1432 | + return ptr; | |
1433 | + } | |
1434 | + rcu_read_unlock(); | |
1435 | + return &ccs_default_security; | |
1436 | +} | |
1437 | + | |
1438 | +/** | |
1439 | + * ccs_task_security_gc - Do garbage collection for "struct task_struct". | |
1440 | + * | |
1441 | + * Returns nothing. | |
1442 | + * | |
1443 | + * Since security_task_free() is missing, I can't release memory associated | |
1444 | + * with "struct task_struct" when a task dies. Therefore, I hold a reference on | |
1445 | + * "struct pid" and runs garbage collection when associated | |
1446 | + * "struct task_struct" has gone. | |
1447 | + */ | |
1448 | +static void ccs_task_security_gc(void) | |
1449 | +{ | |
1450 | + static DEFINE_SPINLOCK(lock); | |
1451 | + static atomic_t gc_counter = ATOMIC_INIT(0); | |
1452 | + unsigned int idx; | |
1453 | + /* | |
1454 | + * If some process is doing execve(), try to garbage collection now. | |
1455 | + * We should kfree() memory associated with "struct ccs_security"->ee | |
1456 | + * as soon as execve() has completed in order to compensate for lack of | |
1457 | + * security_bprm_free() and security_task_free() hooks. | |
1458 | + * | |
1459 | + * Otherwise, reduce frequency for performance reason. | |
1460 | + */ | |
1461 | + if (!atomic_read(&ccs_in_execve_tasks) && | |
1462 | + atomic_inc_return(&gc_counter) < 1024) | |
1463 | + return; | |
1464 | + if (!spin_trylock(&lock)) | |
1465 | + return; | |
1466 | + atomic_set(&gc_counter, 0); | |
1467 | + rcu_read_lock(); | |
1468 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) { | |
1469 | + struct ccs_security *ptr; | |
1470 | + struct list_head *list = &ccs_task_security_list[idx]; | |
1471 | + list_for_each_entry_rcu(ptr, list, list) { | |
1472 | + if (pid_task(ptr->pid, PIDTYPE_PID)) | |
1473 | + continue; | |
1474 | + ccs_del_security(ptr); | |
1475 | + } | |
1476 | + } | |
1477 | + rcu_read_unlock(); | |
1478 | + spin_unlock(&lock); | |
1479 | +} |
@@ -0,0 +1,1482 @@ | ||
1 | +/* | |
2 | + * lsm.c | |
3 | + * | |
4 | + * Copyright (C) 2010-2015 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | |
5 | + * | |
6 | + * Version: 1.0.39 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include "internal.h" | |
10 | +#include "probe.h" | |
11 | + | |
12 | +/* Prototype definition. */ | |
13 | +static void ccs_task_security_gc(void); | |
14 | +static int ccs_copy_cred_security(const struct cred *new, | |
15 | + const struct cred *old, gfp_t gfp); | |
16 | +static struct ccs_security *ccs_find_cred_security(const struct cred *cred); | |
17 | +static DEFINE_SPINLOCK(ccs_task_security_list_lock); | |
18 | +static atomic_t ccs_in_execve_tasks = ATOMIC_INIT(0); | |
19 | +/* | |
20 | + * List of "struct ccs_security" for "struct pid". | |
21 | + * | |
22 | + * All instances on this list is guaranteed that "struct ccs_security"->pid != | |
23 | + * NULL. Also, instances on this list that are in execve() are guaranteed that | |
24 | + * "struct ccs_security"->cred remembers "struct linux_binprm"->cred with a | |
25 | + * refcount on "struct linux_binprm"->cred. | |
26 | + */ | |
27 | +struct list_head ccs_task_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
28 | +/* | |
29 | + * List of "struct ccs_security" for "struct cred". | |
30 | + * | |
31 | + * Since the number of "struct cred" is nearly equals to the number of | |
32 | + * "struct pid", we allocate hash tables like ccs_task_security_list. | |
33 | + * | |
34 | + * All instances on this list are guaranteed that "struct ccs_security"->pid == | |
35 | + * NULL and "struct ccs_security"->cred != NULL. | |
36 | + */ | |
37 | +static struct list_head ccs_cred_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
38 | + | |
39 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
40 | +static struct ccs_security ccs_oom_security = { | |
41 | + .ccs_domain_info = &ccs_kernel_domain | |
42 | +}; | |
43 | + | |
44 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
45 | +static struct ccs_security ccs_default_security = { | |
46 | + .ccs_domain_info = &ccs_kernel_domain | |
47 | +}; | |
48 | + | |
49 | +/* For exporting variables and functions. */ | |
50 | +struct ccsecurity_exports ccsecurity_exports; | |
51 | +/* Members are updated by loadable kernel module. */ | |
52 | +struct ccsecurity_operations ccsecurity_ops; | |
53 | + | |
54 | +/* Original hooks. */ | |
55 | +static union security_list_options original_cred_prepare; | |
56 | +static union security_list_options original_cred_free; | |
57 | +static union security_list_options original_cred_alloc_blank; | |
58 | + | |
59 | +#ifdef CONFIG_AKARI_TRACE_EXECVE_COUNT | |
60 | + | |
61 | +/** | |
62 | + * ccs_update_ee_counter - Update "struct ccs_execve" counter. | |
63 | + * | |
64 | + * @count: Count to increment or decrement. | |
65 | + * | |
66 | + * Returns updated counter. | |
67 | + */ | |
68 | +static unsigned int ccs_update_ee_counter(int count) | |
69 | +{ | |
70 | + /* Debug counter for detecting "struct ccs_execve" memory leak. */ | |
71 | + static atomic_t ccs_ee_counter = ATOMIC_INIT(0); | |
72 | + return atomic_add_return(count, &ccs_ee_counter); | |
73 | +} | |
74 | + | |
75 | +/** | |
76 | + * ccs_audit_alloc_execve - Audit allocation of "struct ccs_execve". | |
77 | + * | |
78 | + * @ee: Pointer to "struct ccs_execve". | |
79 | + * | |
80 | + * Returns nothing. | |
81 | + */ | |
82 | +void ccs_audit_alloc_execve(const struct ccs_execve * const ee) | |
83 | +{ | |
84 | + printk(KERN_INFO "AKARI: Allocated %p by pid=%u (count=%u)\n", ee, | |
85 | + current->pid, ccs_update_ee_counter(1) - 1); | |
86 | +} | |
87 | + | |
88 | +/** | |
89 | + * ccs_audit_free_execve - Audit release of "struct ccs_execve". | |
90 | + * | |
91 | + * @ee: Pointer to "struct ccs_execve". | |
92 | + * @task: True if released by current task, false otherwise. | |
93 | + * | |
94 | + * Returns nothing. | |
95 | + */ | |
96 | +void ccs_audit_free_execve(const struct ccs_execve * const ee, | |
97 | + const bool is_current) | |
98 | +{ | |
99 | + const unsigned int tmp = ccs_update_ee_counter(-1); | |
100 | + if (is_current) | |
101 | + printk(KERN_INFO "AKARI: Releasing %p by pid=%u (count=%u)\n", | |
102 | + ee, current->pid, tmp); | |
103 | + else | |
104 | + printk(KERN_INFO "AKARI: Releasing %p by kernel (count=%u)\n", | |
105 | + ee, tmp); | |
106 | +} | |
107 | + | |
108 | +#endif | |
109 | + | |
110 | +#if !defined(CONFIG_AKARI_DEBUG) | |
111 | +#define ccs_debug_trace(pos) do { } while (0) | |
112 | +#else | |
113 | +#define ccs_debug_trace(pos) \ | |
114 | + do { \ | |
115 | + static bool done; \ | |
116 | + if (!done) { \ | |
117 | + printk(KERN_INFO \ | |
118 | + "AKARI: Debug trace: " pos " of 4\n"); \ | |
119 | + done = true; \ | |
120 | + } \ | |
121 | + } while (0) | |
122 | +#endif | |
123 | + | |
124 | +/** | |
125 | + * ccs_clear_execve - Release memory used by do_execve(). | |
126 | + * | |
127 | + * @ret: 0 if do_execve() succeeded, negative value otherwise. | |
128 | + * @security: Pointer to "struct ccs_security". | |
129 | + * | |
130 | + * Returns nothing. | |
131 | + */ | |
132 | +static void ccs_clear_execve(int ret, struct ccs_security *security) | |
133 | +{ | |
134 | + struct ccs_execve *ee; | |
135 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
136 | + return; | |
137 | + ee = security->ee; | |
138 | + security->ee = NULL; | |
139 | + if (!ee) | |
140 | + return; | |
141 | + atomic_dec(&ccs_in_execve_tasks); | |
142 | + ccs_finish_execve(ret, ee); | |
143 | +} | |
144 | + | |
145 | +/** | |
146 | + * ccs_rcu_free - RCU callback for releasing "struct ccs_security". | |
147 | + * | |
148 | + * @rcu: Pointer to "struct rcu_head". | |
149 | + * | |
150 | + * Returns nothing. | |
151 | + */ | |
152 | +static void ccs_rcu_free(struct rcu_head *rcu) | |
153 | +{ | |
154 | + struct ccs_security *ptr = container_of(rcu, typeof(*ptr), rcu); | |
155 | + struct ccs_execve *ee = ptr->ee; | |
156 | + /* | |
157 | + * If this security context was associated with "struct pid" and | |
158 | + * ptr->ccs_flags has CCS_TASK_IS_IN_EXECVE set, it indicates that a | |
159 | + * "struct task_struct" associated with this security context exited | |
160 | + * immediately after do_execve() has failed. | |
161 | + */ | |
162 | + if (ptr->pid && (ptr->ccs_flags & CCS_TASK_IS_IN_EXECVE)) { | |
163 | + ccs_debug_trace("1"); | |
164 | + atomic_dec(&ccs_in_execve_tasks); | |
165 | + } | |
166 | + /* | |
167 | + * If this security context was associated with "struct pid", | |
168 | + * drop refcount obtained by get_pid() in ccs_find_task_security(). | |
169 | + */ | |
170 | + if (ptr->pid) { | |
171 | + ccs_debug_trace("2"); | |
172 | + put_pid(ptr->pid); | |
173 | + } | |
174 | + if (ee) { | |
175 | + ccs_debug_trace("3"); | |
176 | + ccs_audit_free_execve(ee, false); | |
177 | + kfree(ee->handler_path); | |
178 | + kfree(ee); | |
179 | + } | |
180 | + kfree(ptr); | |
181 | +} | |
182 | + | |
183 | +/** | |
184 | + * ccs_del_security - Release "struct ccs_security". | |
185 | + * | |
186 | + * @ptr: Pointer to "struct ccs_security". | |
187 | + * | |
188 | + * Returns nothing. | |
189 | + */ | |
190 | +static void ccs_del_security(struct ccs_security *ptr) | |
191 | +{ | |
192 | + unsigned long flags; | |
193 | + if (ptr == &ccs_default_security || ptr == &ccs_oom_security) | |
194 | + return; | |
195 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
196 | + list_del_rcu(&ptr->list); | |
197 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
198 | + call_rcu(&ptr->rcu, ccs_rcu_free); | |
199 | +} | |
200 | + | |
201 | +/** | |
202 | + * ccs_add_cred_security - Add "struct ccs_security" to list. | |
203 | + * | |
204 | + * @ptr: Pointer to "struct ccs_security". | |
205 | + * | |
206 | + * Returns nothing. | |
207 | + */ | |
208 | +static void ccs_add_cred_security(struct ccs_security *ptr) | |
209 | +{ | |
210 | + unsigned long flags; | |
211 | + struct list_head *list = &ccs_cred_security_list | |
212 | + [hash_ptr((void *) ptr->cred, CCS_TASK_SECURITY_HASH_BITS)]; | |
213 | +#ifdef CONFIG_AKARI_DEBUG | |
214 | + if (ptr->pid) | |
215 | + printk(KERN_INFO "AKARI: \"struct ccs_security\"->pid != NULL" | |
216 | + "\n"); | |
217 | +#endif | |
218 | + ptr->pid = NULL; | |
219 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
220 | + list_add_rcu(&ptr->list, list); | |
221 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
222 | +} | |
223 | + | |
224 | +/** | |
225 | + * ccs_task_create - Make snapshot of security context for new task. | |
226 | + * | |
227 | + * @clone_flags: Flags passed to clone(). | |
228 | + * | |
229 | + * Returns 0 on success, negative value otherwise. | |
230 | + */ | |
231 | +static int ccs_task_create(unsigned long clone_flags) | |
232 | +{ | |
233 | + struct ccs_security *old_security; | |
234 | + struct ccs_security *new_security; | |
235 | + struct cred *cred = prepare_creds(); | |
236 | + if (!cred) | |
237 | + return -ENOMEM; | |
238 | + old_security = ccs_find_task_security(current); | |
239 | + new_security = ccs_find_cred_security(cred); | |
240 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
241 | + new_security->ccs_flags = old_security->ccs_flags; | |
242 | + return commit_creds(cred); | |
243 | +} | |
244 | + | |
245 | +/** | |
246 | + * ccs_cred_prepare - Allocate memory for new credentials. | |
247 | + * | |
248 | + * @new: Pointer to "struct cred". | |
249 | + * @old: Pointer to "struct cred". | |
250 | + * @gfp: Memory allocation flags. | |
251 | + * | |
252 | + * Returns 0 on success, negative value otherwise. | |
253 | + */ | |
254 | +static int ccs_cred_prepare(struct cred *new, const struct cred *old, | |
255 | + gfp_t gfp) | |
256 | +{ | |
257 | + int rc1; | |
258 | + /* | |
259 | + * For checking whether reverting domain transition is needed or not. | |
260 | + * | |
261 | + * See ccs_find_task_security() for reason. | |
262 | + */ | |
263 | + if (gfp == GFP_KERNEL) | |
264 | + ccs_find_task_security(current); | |
265 | + rc1 = ccs_copy_cred_security(new, old, gfp); | |
266 | + if (gfp == GFP_KERNEL) | |
267 | + ccs_task_security_gc(); | |
268 | + if (original_cred_prepare.cred_prepare) { | |
269 | + const int rc2 = original_cred_prepare.cred_prepare(new, old, | |
270 | + gfp); | |
271 | + if (rc2) { | |
272 | + ccs_del_security(ccs_find_cred_security(new)); | |
273 | + return rc2; | |
274 | + } | |
275 | + } | |
276 | + return rc1; | |
277 | +} | |
278 | + | |
279 | +/** | |
280 | + * ccs_cred_free - Release memory used by credentials. | |
281 | + * | |
282 | + * @cred: Pointer to "struct cred". | |
283 | + * | |
284 | + * Returns nothing. | |
285 | + */ | |
286 | +static void ccs_cred_free(struct cred *cred) | |
287 | +{ | |
288 | + if (original_cred_free.cred_free) | |
289 | + original_cred_free.cred_free(cred); | |
290 | + ccs_del_security(ccs_find_cred_security(cred)); | |
291 | +} | |
292 | + | |
293 | +/** | |
294 | + * ccs_alloc_cred_security - Allocate memory for new credentials. | |
295 | + * | |
296 | + * @cred: Pointer to "struct cred". | |
297 | + * @gfp: Memory allocation flags. | |
298 | + * | |
299 | + * Returns 0 on success, negative value otherwise. | |
300 | + */ | |
301 | +static int ccs_alloc_cred_security(const struct cred *cred, gfp_t gfp) | |
302 | +{ | |
303 | + struct ccs_security *new_security = kzalloc(sizeof(*new_security), | |
304 | + gfp); | |
305 | + if (!new_security) | |
306 | + return -ENOMEM; | |
307 | + new_security->cred = cred; | |
308 | + ccs_add_cred_security(new_security); | |
309 | + return 0; | |
310 | +} | |
311 | + | |
312 | +/** | |
313 | + * ccs_cred_alloc_blank - Allocate memory for new credentials. | |
314 | + * | |
315 | + * @new: Pointer to "struct cred". | |
316 | + * @gfp: Memory allocation flags. | |
317 | + * | |
318 | + * Returns 0 on success, negative value otherwise. | |
319 | + */ | |
320 | +static int ccs_cred_alloc_blank(struct cred *new, gfp_t gfp) | |
321 | +{ | |
322 | + const int rc1 = ccs_alloc_cred_security(new, gfp); | |
323 | + if (original_cred_alloc_blank.cred_alloc_blank) { | |
324 | + const int rc2 = original_cred_alloc_blank. | |
325 | + cred_alloc_blank(new, gfp); | |
326 | + if (rc2) { | |
327 | + ccs_del_security(ccs_find_cred_security(new)); | |
328 | + return rc2; | |
329 | + } | |
330 | + } | |
331 | + return rc1; | |
332 | +} | |
333 | + | |
334 | +/** | |
335 | + * ccs_cred_transfer - Transfer "struct ccs_security" between credentials. | |
336 | + * | |
337 | + * @new: Pointer to "struct cred". | |
338 | + * @old: Pointer to "struct cred". | |
339 | + * | |
340 | + * Returns nothing. | |
341 | + */ | |
342 | +static void ccs_cred_transfer(struct cred *new, const struct cred *old) | |
343 | +{ | |
344 | + struct ccs_security *new_security = ccs_find_cred_security(new); | |
345 | + struct ccs_security *old_security = ccs_find_cred_security(old); | |
346 | + if (new_security == &ccs_default_security || | |
347 | + new_security == &ccs_oom_security || | |
348 | + old_security == &ccs_default_security || | |
349 | + old_security == &ccs_oom_security) | |
350 | + return; | |
351 | + new_security->ccs_flags = old_security->ccs_flags; | |
352 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
353 | +} | |
354 | + | |
355 | +/** | |
356 | + * ccs_bprm_committing_creds - A hook which is called when do_execve() succeeded. | |
357 | + * | |
358 | + * @bprm: Pointer to "struct linux_binprm". | |
359 | + * | |
360 | + * Returns nothing. | |
361 | + */ | |
362 | +static void ccs_bprm_committing_creds(struct linux_binprm *bprm) | |
363 | +{ | |
364 | + struct ccs_security *old_security = ccs_current_security(); | |
365 | + struct ccs_security *new_security; | |
366 | + if (old_security == &ccs_default_security || | |
367 | + old_security == &ccs_oom_security) | |
368 | + return; | |
369 | + ccs_clear_execve(0, old_security); | |
370 | + /* Update current task's cred's domain for future fork(). */ | |
371 | + new_security = ccs_find_cred_security(bprm->cred); | |
372 | + new_security->ccs_flags = old_security->ccs_flags; | |
373 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
374 | +} | |
375 | + | |
376 | +/** | |
377 | + * ccs_bprm_check_security - Check permission for execve(). | |
378 | + * | |
379 | + * @bprm: Pointer to "struct linux_binprm". | |
380 | + * | |
381 | + * Returns 0 on success, negative value otherwise. | |
382 | + */ | |
383 | +static int ccs_bprm_check_security(struct linux_binprm *bprm) | |
384 | +{ | |
385 | + struct ccs_security *security = ccs_current_security(); | |
386 | + int rc; | |
387 | + if (security == &ccs_default_security || security == &ccs_oom_security) | |
388 | + return -ENOMEM; | |
389 | + if (security->ee) | |
390 | + return 0; | |
391 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
392 | + if (!ccs_policy_loaded) | |
393 | + ccs_load_policy(bprm->filename); | |
394 | +#endif | |
395 | + rc = ccs_start_execve(bprm, &security->ee); | |
396 | + if (security->ee) | |
397 | + atomic_inc(&ccs_in_execve_tasks); | |
398 | + return rc; | |
399 | +} | |
400 | + | |
401 | +/** | |
402 | + * ccs_file_open - Check permission for open(). | |
403 | + * | |
404 | + * @f: Pointer to "struct file". | |
405 | + * @cred: Pointer to "struct cred". | |
406 | + * | |
407 | + * Returns 0 on success, negative value otherwise. | |
408 | + */ | |
409 | +static int ccs_file_open(struct file *f, const struct cred *cred) | |
410 | +{ | |
411 | + return ccs_open_permission(f); | |
412 | +} | |
413 | + | |
414 | +#ifdef CONFIG_SECURITY_PATH | |
415 | + | |
416 | +/** | |
417 | + * ccs_path_chown - Check permission for chown()/chgrp(). | |
418 | + * | |
419 | + * @path: Pointer to "struct path". | |
420 | + * @user: User ID. | |
421 | + * @group: Group ID. | |
422 | + * | |
423 | + * Returns 0 on success, negative value otherwise. | |
424 | + */ | |
425 | +static int ccs_path_chown(const struct path *path, kuid_t user, kgid_t group) | |
426 | +{ | |
427 | + return ccs_chown_permission(path->dentry, path->mnt, user, group); | |
428 | +} | |
429 | + | |
430 | +/** | |
431 | + * ccs_path_chmod - Check permission for chmod(). | |
432 | + * | |
433 | + * @path: Pointer to "struct path". | |
434 | + * @mode: Mode. | |
435 | + * | |
436 | + * Returns 0 on success, negative value otherwise. | |
437 | + */ | |
438 | +static int ccs_path_chmod(const struct path *path, umode_t mode) | |
439 | +{ | |
440 | + return ccs_chmod_permission(path->dentry, path->mnt, mode); | |
441 | +} | |
442 | + | |
443 | +/** | |
444 | + * ccs_path_chroot - Check permission for chroot(). | |
445 | + * | |
446 | + * @path: Pointer to "struct path". | |
447 | + * | |
448 | + * Returns 0 on success, negative value otherwise. | |
449 | + */ | |
450 | +static int ccs_path_chroot(const struct path *path) | |
451 | +{ | |
452 | + return ccs_chroot_permission(path); | |
453 | +} | |
454 | + | |
455 | +/** | |
456 | + * ccs_path_truncate - Check permission for truncate(). | |
457 | + * | |
458 | + * @path: Pointer to "struct path". | |
459 | + * | |
460 | + * Returns 0 on success, negative value otherwise. | |
461 | + */ | |
462 | +static int ccs_path_truncate(const struct path *path) | |
463 | +{ | |
464 | + return ccs_truncate_permission(path->dentry, path->mnt); | |
465 | +} | |
466 | + | |
467 | +#else | |
468 | + | |
469 | +/** | |
470 | + * ccs_inode_setattr - Check permission for chown()/chgrp()/chmod()/truncate(). | |
471 | + * | |
472 | + * @dentry: Pointer to "struct dentry". | |
473 | + * @attr: Pointer to "struct iattr". | |
474 | + * | |
475 | + * Returns 0 on success, negative value otherwise. | |
476 | + */ | |
477 | +static int ccs_inode_setattr(struct dentry *dentry, struct iattr *attr) | |
478 | +{ | |
479 | + const int rc1 = (attr->ia_valid & ATTR_UID) ? | |
480 | + ccs_chown_permission(dentry, NULL, attr->ia_uid, INVALID_GID) : | |
481 | + 0; | |
482 | + const int rc2 = (attr->ia_valid & ATTR_GID) ? | |
483 | + ccs_chown_permission(dentry, NULL, INVALID_UID, attr->ia_gid) : | |
484 | + 0; | |
485 | + const int rc3 = (attr->ia_valid & ATTR_MODE) ? | |
486 | + ccs_chmod_permission(dentry, NULL, attr->ia_mode) : 0; | |
487 | + const int rc4 = (attr->ia_valid & ATTR_SIZE) ? | |
488 | + ccs_truncate_permission(dentry, NULL) : 0; | |
489 | + if (rc4) | |
490 | + return rc4; | |
491 | + if (rc3) | |
492 | + return rc3; | |
493 | + if (rc2) | |
494 | + return rc2; | |
495 | + return rc1; | |
496 | +} | |
497 | + | |
498 | +#endif | |
499 | + | |
500 | +/** | |
501 | + * ccs_inode_getattr - Check permission for stat(). | |
502 | + * | |
503 | + * @path: Pointer to "struct path". | |
504 | + * | |
505 | + * Returns 0 on success, negative value otherwise. | |
506 | + */ | |
507 | +static int ccs_inode_getattr(const struct path *path) | |
508 | +{ | |
509 | + return ccs_getattr_permission(path->mnt, path->dentry); | |
510 | +} | |
511 | + | |
512 | +#ifdef CONFIG_SECURITY_PATH | |
513 | + | |
514 | +/** | |
515 | + * ccs_path_mknod - Check permission for mknod(). | |
516 | + * | |
517 | + * @dir: Pointer to "struct path". | |
518 | + * @dentry: Pointer to "struct dentry". | |
519 | + * @mode: Create mode. | |
520 | + * @dev: Device major/minor number. | |
521 | + * | |
522 | + * Returns 0 on success, negative value otherwise. | |
523 | + */ | |
524 | +static int ccs_path_mknod(const struct path *dir, struct dentry *dentry, | |
525 | + umode_t mode, unsigned int dev) | |
526 | +{ | |
527 | + return ccs_mknod_permission(dentry, dir->mnt, mode, dev); | |
528 | +} | |
529 | + | |
530 | +/** | |
531 | + * ccs_path_mkdir - Check permission for mkdir(). | |
532 | + * | |
533 | + * @dir: Pointer to "struct path". | |
534 | + * @dentry: Pointer to "struct dentry". | |
535 | + * @mode: Create mode. | |
536 | + * | |
537 | + * Returns 0 on success, negative value otherwise. | |
538 | + */ | |
539 | +static int ccs_path_mkdir(const struct path *dir, struct dentry *dentry, | |
540 | + umode_t mode) | |
541 | +{ | |
542 | + return ccs_mkdir_permission(dentry, dir->mnt, mode); | |
543 | +} | |
544 | + | |
545 | +/** | |
546 | + * ccs_path_rmdir - Check permission for rmdir(). | |
547 | + * | |
548 | + * @dir: Pointer to "struct path". | |
549 | + * @dentry: Pointer to "struct dentry". | |
550 | + * | |
551 | + * Returns 0 on success, negative value otherwise. | |
552 | + */ | |
553 | +static int ccs_path_rmdir(const struct path *dir, struct dentry *dentry) | |
554 | +{ | |
555 | + return ccs_rmdir_permission(dentry, dir->mnt); | |
556 | +} | |
557 | + | |
558 | +/** | |
559 | + * ccs_path_unlink - Check permission for unlink(). | |
560 | + * | |
561 | + * @dir: Pointer to "struct path". | |
562 | + * @dentry: Pointer to "struct dentry". | |
563 | + * | |
564 | + * Returns 0 on success, negative value otherwise. | |
565 | + */ | |
566 | +static int ccs_path_unlink(const struct path *dir, struct dentry *dentry) | |
567 | +{ | |
568 | + return ccs_unlink_permission(dentry, dir->mnt); | |
569 | +} | |
570 | + | |
571 | +/** | |
572 | + * ccs_path_symlink - Check permission for symlink(). | |
573 | + * | |
574 | + * @dir: Pointer to "struct path". | |
575 | + * @dentry: Pointer to "struct dentry". | |
576 | + * @old_name: Content of symbolic link. | |
577 | + * | |
578 | + * Returns 0 on success, negative value otherwise. | |
579 | + */ | |
580 | +static int ccs_path_symlink(const struct path *dir, struct dentry *dentry, | |
581 | + const char *old_name) | |
582 | +{ | |
583 | + return ccs_symlink_permission(dentry, dir->mnt, old_name); | |
584 | +} | |
585 | + | |
586 | +/** | |
587 | + * ccs_path_rename - Check permission for rename(). | |
588 | + * | |
589 | + * @old_dir: Pointer to "struct path". | |
590 | + * @old_dentry: Pointer to "struct dentry". | |
591 | + * @new_dir: Pointer to "struct path". | |
592 | + * @new_dentry: Pointer to "struct dentry". | |
593 | + * | |
594 | + * Returns 0 on success, negative value otherwise. | |
595 | + */ | |
596 | +static int ccs_path_rename(const struct path *old_dir, | |
597 | + struct dentry *old_dentry, | |
598 | + const struct path *new_dir, | |
599 | + struct dentry *new_dentry) | |
600 | +{ | |
601 | + return ccs_rename_permission(old_dentry, new_dentry, old_dir->mnt); | |
602 | +} | |
603 | + | |
604 | +/** | |
605 | + * ccs_path_link - Check permission for link(). | |
606 | + * | |
607 | + * @old_dentry: Pointer to "struct dentry". | |
608 | + * @new_dir: Pointer to "struct path". | |
609 | + * @new_dentry: Pointer to "struct dentry". | |
610 | + * | |
611 | + * Returns 0 on success, negative value otherwise. | |
612 | + */ | |
613 | +static int ccs_path_link(struct dentry *old_dentry, const struct path *new_dir, | |
614 | + struct dentry *new_dentry) | |
615 | +{ | |
616 | + return ccs_link_permission(old_dentry, new_dentry, new_dir->mnt); | |
617 | +} | |
618 | + | |
619 | +#else | |
620 | + | |
621 | +/** | |
622 | + * ccs_inode_mknod - Check permission for mknod(). | |
623 | + * | |
624 | + * @dir: Pointer to "struct inode". | |
625 | + * @dentry: Pointer to "struct dentry". | |
626 | + * @mode: Create mode. | |
627 | + * @dev: Device major/minor number. | |
628 | + * | |
629 | + * Returns 0 on success, negative value otherwise. | |
630 | + */ | |
631 | +static int ccs_inode_mknod(struct inode *dir, struct dentry *dentry, | |
632 | + umode_t mode, dev_t dev) | |
633 | +{ | |
634 | + return ccs_mknod_permission(dentry, NULL, mode, dev); | |
635 | +} | |
636 | + | |
637 | +/** | |
638 | + * ccs_inode_mkdir - Check permission for mkdir(). | |
639 | + * | |
640 | + * @dir: Pointer to "struct inode". | |
641 | + * @dentry: Pointer to "struct dentry". | |
642 | + * @mode: Create mode. | |
643 | + * | |
644 | + * Returns 0 on success, negative value otherwise. | |
645 | + */ | |
646 | +static int ccs_inode_mkdir(struct inode *dir, struct dentry *dentry, | |
647 | + umode_t mode) | |
648 | +{ | |
649 | + return ccs_mkdir_permission(dentry, NULL, mode); | |
650 | +} | |
651 | + | |
652 | +/** | |
653 | + * ccs_inode_rmdir - Check permission for rmdir(). | |
654 | + * | |
655 | + * @dir: Pointer to "struct inode". | |
656 | + * @dentry: Pointer to "struct dentry". | |
657 | + * | |
658 | + * Returns 0 on success, negative value otherwise. | |
659 | + */ | |
660 | +static int ccs_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
661 | +{ | |
662 | + return ccs_rmdir_permission(dentry, NULL); | |
663 | +} | |
664 | + | |
665 | +/** | |
666 | + * ccs_inode_unlink - Check permission for unlink(). | |
667 | + * | |
668 | + * @dir: Pointer to "struct inode". | |
669 | + * @dentry: Pointer to "struct dentry". | |
670 | + * | |
671 | + * Returns 0 on success, negative value otherwise. | |
672 | + */ | |
673 | +static int ccs_inode_unlink(struct inode *dir, struct dentry *dentry) | |
674 | +{ | |
675 | + return ccs_unlink_permission(dentry, NULL); | |
676 | +} | |
677 | + | |
678 | +/** | |
679 | + * ccs_inode_symlink - Check permission for symlink(). | |
680 | + * | |
681 | + * @dir: Pointer to "struct inode". | |
682 | + * @dentry: Pointer to "struct dentry". | |
683 | + * @old_name: Content of symbolic link. | |
684 | + * | |
685 | + * Returns 0 on success, negative value otherwise. | |
686 | + */ | |
687 | +static int ccs_inode_symlink(struct inode *dir, struct dentry *dentry, | |
688 | + const char *old_name) | |
689 | +{ | |
690 | + return ccs_symlink_permission(dentry, NULL, old_name); | |
691 | +} | |
692 | + | |
693 | +/** | |
694 | + * ccs_inode_rename - Check permission for rename(). | |
695 | + * | |
696 | + * @old_dir: Pointer to "struct inode". | |
697 | + * @old_dentry: Pointer to "struct dentry". | |
698 | + * @new_dir: Pointer to "struct inode". | |
699 | + * @new_dentry: Pointer to "struct dentry". | |
700 | + * | |
701 | + * Returns 0 on success, negative value otherwise. | |
702 | + */ | |
703 | +static int ccs_inode_rename(struct inode *old_dir, struct dentry *old_dentry, | |
704 | + struct inode *new_dir, struct dentry *new_dentry) | |
705 | +{ | |
706 | + return ccs_rename_permission(old_dentry, new_dentry, NULL); | |
707 | +} | |
708 | + | |
709 | +/** | |
710 | + * ccs_inode_link - Check permission for link(). | |
711 | + * | |
712 | + * @old_dentry: Pointer to "struct dentry". | |
713 | + * @dir: Pointer to "struct inode". | |
714 | + * @new_dentry: Pointer to "struct dentry". | |
715 | + * | |
716 | + * Returns 0 on success, negative value otherwise. | |
717 | + */ | |
718 | +static int ccs_inode_link(struct dentry *old_dentry, struct inode *dir, | |
719 | + struct dentry *new_dentry) | |
720 | +{ | |
721 | + return ccs_link_permission(old_dentry, new_dentry, NULL); | |
722 | +} | |
723 | + | |
724 | +/** | |
725 | + * ccs_inode_create - Check permission for creat(). | |
726 | + * | |
727 | + * @dir: Pointer to "struct inode". | |
728 | + * @dentry: Pointer to "struct dentry". | |
729 | + * @mode: Create mode. | |
730 | + * | |
731 | + * Returns 0 on success, negative value otherwise. | |
732 | + */ | |
733 | +static int ccs_inode_create(struct inode *dir, struct dentry *dentry, | |
734 | + umode_t mode) | |
735 | +{ | |
736 | + return ccs_mknod_permission(dentry, NULL, mode, 0); | |
737 | +} | |
738 | + | |
739 | +#endif | |
740 | + | |
741 | +#ifdef CONFIG_SECURITY_NETWORK | |
742 | + | |
743 | +#include <net/sock.h> | |
744 | + | |
745 | +/* Structure for remembering an accept()ed socket's status. */ | |
746 | +struct ccs_socket_tag { | |
747 | + struct list_head list; | |
748 | + struct inode *inode; | |
749 | + int status; | |
750 | + struct rcu_head rcu; | |
751 | +}; | |
752 | + | |
753 | +/* | |
754 | + * List for managing accept()ed sockets. | |
755 | + * Since we don't need to keep an accept()ed socket into this list after | |
756 | + * once the permission was granted, the number of entries in this list is | |
757 | + * likely small. Therefore, we don't use hash tables. | |
758 | + */ | |
759 | +static LIST_HEAD(ccs_accepted_socket_list); | |
760 | +/* Lock for protecting ccs_accepted_socket_list . */ | |
761 | +static DEFINE_SPINLOCK(ccs_accepted_socket_list_lock); | |
762 | + | |
763 | +/** | |
764 | + * ccs_update_socket_tag - Update tag associated with accept()ed sockets. | |
765 | + * | |
766 | + * @inode: Pointer to "struct inode". | |
767 | + * @status: New status. | |
768 | + * | |
769 | + * Returns nothing. | |
770 | + * | |
771 | + * If @status == 0, memory for that socket will be released after RCU grace | |
772 | + * period. | |
773 | + */ | |
774 | +static void ccs_update_socket_tag(struct inode *inode, int status) | |
775 | +{ | |
776 | + struct ccs_socket_tag *ptr; | |
777 | + /* | |
778 | + * Protect whole section because multiple threads may call this | |
779 | + * function with same "sock" via ccs_validate_socket(). | |
780 | + */ | |
781 | + spin_lock(&ccs_accepted_socket_list_lock); | |
782 | + rcu_read_lock(); | |
783 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
784 | + if (ptr->inode != inode) | |
785 | + continue; | |
786 | + ptr->status = status; | |
787 | + if (status) | |
788 | + break; | |
789 | + list_del_rcu(&ptr->list); | |
790 | + kfree_rcu(ptr, rcu); | |
791 | + break; | |
792 | + } | |
793 | + rcu_read_unlock(); | |
794 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
795 | +} | |
796 | + | |
797 | +/** | |
798 | + * ccs_validate_socket - Check post accept() permission if needed. | |
799 | + * | |
800 | + * @sock: Pointer to "struct socket". | |
801 | + * | |
802 | + * Returns 0 on success, negative value otherwise. | |
803 | + */ | |
804 | +static int ccs_validate_socket(struct socket *sock) | |
805 | +{ | |
806 | + struct inode *inode = SOCK_INODE(sock); | |
807 | + struct ccs_socket_tag *ptr; | |
808 | + int ret = 0; | |
809 | + rcu_read_lock(); | |
810 | + list_for_each_entry_rcu(ptr, &ccs_accepted_socket_list, list) { | |
811 | + if (ptr->inode != inode) | |
812 | + continue; | |
813 | + ret = ptr->status; | |
814 | + break; | |
815 | + } | |
816 | + rcu_read_unlock(); | |
817 | + if (ret <= 0) | |
818 | + /* | |
819 | + * This socket is not an accept()ed socket or this socket is | |
820 | + * an accept()ed socket and post accept() permission is done. | |
821 | + */ | |
822 | + return ret; | |
823 | + /* | |
824 | + * Check post accept() permission now. | |
825 | + * | |
826 | + * Strictly speaking, we need to pass both listen()ing socket and | |
827 | + * accept()ed socket to __ccs_socket_post_accept_permission(). | |
828 | + * But since socket's family and type are same for both sockets, | |
829 | + * passing the accept()ed socket in place for the listen()ing socket | |
830 | + * will work. | |
831 | + */ | |
832 | + ret = ccs_socket_post_accept_permission(sock, sock); | |
833 | + /* | |
834 | + * If permission was granted, we forget that this is an accept()ed | |
835 | + * socket. Otherwise, we remember that this socket needs to return | |
836 | + * error for subsequent socketcalls. | |
837 | + */ | |
838 | + ccs_update_socket_tag(inode, ret); | |
839 | + return ret; | |
840 | +} | |
841 | + | |
842 | +/** | |
843 | + * ccs_socket_accept - Check permission for accept(). | |
844 | + * | |
845 | + * @sock: Pointer to "struct socket". | |
846 | + * @newsock: Pointer to "struct socket". | |
847 | + * | |
848 | + * Returns 0 on success, negative value otherwise. | |
849 | + * | |
850 | + * This hook is used for setting up environment for doing post accept() | |
851 | + * permission check. If dereferencing sock->ops->something() were ordered by | |
852 | + * rcu_dereference(), we could replace sock->ops with "a copy of original | |
853 | + * sock->ops with modified sock->ops->accept()" using rcu_assign_pointer() | |
854 | + * in order to do post accept() permission check before returning to userspace. | |
855 | + * If we make the copy in security_socket_post_create(), it would be possible | |
856 | + * to safely replace sock->ops here, but we don't do so because we don't want | |
857 | + * to allocate memory for sockets which do not call sock->ops->accept(). | |
858 | + * Therefore, we do post accept() permission check upon next socket syscalls | |
859 | + * rather than between sock->ops->accept() and returning to userspace. | |
860 | + * This means that if a socket was close()d before calling some socket | |
861 | + * syscalls, post accept() permission check will not be done. | |
862 | + */ | |
863 | +static int ccs_socket_accept(struct socket *sock, struct socket *newsock) | |
864 | +{ | |
865 | + struct ccs_socket_tag *ptr; | |
866 | + const int rc = ccs_validate_socket(sock); | |
867 | + if (rc < 0) | |
868 | + return rc; | |
869 | + ptr = kzalloc(sizeof(*ptr), GFP_KERNEL); | |
870 | + if (!ptr) | |
871 | + return -ENOMEM; | |
872 | + /* | |
873 | + * Subsequent LSM hooks will receive "newsock". Therefore, I mark | |
874 | + * "newsock" as "an accept()ed socket but post accept() permission | |
875 | + * check is not done yet" by allocating memory using inode of the | |
876 | + * "newsock" as a search key. | |
877 | + */ | |
878 | + ptr->inode = SOCK_INODE(newsock); | |
879 | + ptr->status = 1; /* Check post accept() permission later. */ | |
880 | + spin_lock(&ccs_accepted_socket_list_lock); | |
881 | + list_add_tail_rcu(&ptr->list, &ccs_accepted_socket_list); | |
882 | + spin_unlock(&ccs_accepted_socket_list_lock); | |
883 | + return 0; | |
884 | +} | |
885 | + | |
886 | +/** | |
887 | + * ccs_socket_listen - Check permission for listen(). | |
888 | + * | |
889 | + * @sock: Pointer to "struct socket". | |
890 | + * @backlog: Backlog parameter. | |
891 | + * | |
892 | + * Returns 0 on success, negative value otherwise. | |
893 | + */ | |
894 | +static int ccs_socket_listen(struct socket *sock, int backlog) | |
895 | +{ | |
896 | + const int rc = ccs_validate_socket(sock); | |
897 | + if (rc < 0) | |
898 | + return rc; | |
899 | + return ccs_socket_listen_permission(sock); | |
900 | +} | |
901 | + | |
902 | +/** | |
903 | + * ccs_socket_connect - Check permission for connect(). | |
904 | + * | |
905 | + * @sock: Pointer to "struct socket". | |
906 | + * @addr: Pointer to "struct sockaddr". | |
907 | + * @addr_len: Size of @addr. | |
908 | + * | |
909 | + * Returns 0 on success, negative value otherwise. | |
910 | + */ | |
911 | +static int ccs_socket_connect(struct socket *sock, struct sockaddr *addr, | |
912 | + int addr_len) | |
913 | +{ | |
914 | + const int rc = ccs_validate_socket(sock); | |
915 | + if (rc < 0) | |
916 | + return rc; | |
917 | + return ccs_socket_connect_permission(sock, addr, addr_len); | |
918 | +} | |
919 | + | |
920 | +/** | |
921 | + * ccs_socket_bind - Check permission for bind(). | |
922 | + * | |
923 | + * @sock: Pointer to "struct socket". | |
924 | + * @addr: Pointer to "struct sockaddr". | |
925 | + * @addr_len: Size of @addr. | |
926 | + * | |
927 | + * Returns 0 on success, negative value otherwise. | |
928 | + */ | |
929 | +static int ccs_socket_bind(struct socket *sock, struct sockaddr *addr, | |
930 | + int addr_len) | |
931 | +{ | |
932 | + const int rc = ccs_validate_socket(sock); | |
933 | + if (rc < 0) | |
934 | + return rc; | |
935 | + return ccs_socket_bind_permission(sock, addr, addr_len); | |
936 | +} | |
937 | + | |
938 | +/** | |
939 | + * ccs_socket_sendmsg - Check permission for sendmsg(). | |
940 | + * | |
941 | + * @sock: Pointer to "struct socket". | |
942 | + * @msg: Pointer to "struct msghdr". | |
943 | + * @size: Size of message. | |
944 | + * | |
945 | + * Returns 0 on success, negative value otherwise. | |
946 | + */ | |
947 | +static int ccs_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
948 | + int size) | |
949 | +{ | |
950 | + const int rc = ccs_validate_socket(sock); | |
951 | + if (rc < 0) | |
952 | + return rc; | |
953 | + return ccs_socket_sendmsg_permission(sock, msg, size); | |
954 | +} | |
955 | + | |
956 | +/** | |
957 | + * ccs_socket_recvmsg - Check permission for recvmsg(). | |
958 | + * | |
959 | + * @sock: Pointer to "struct socket". | |
960 | + * @msg: Pointer to "struct msghdr". | |
961 | + * @size: Size of message. | |
962 | + * @flags: Flags. | |
963 | + * | |
964 | + * Returns 0 on success, negative value otherwise. | |
965 | + */ | |
966 | +static int ccs_socket_recvmsg(struct socket *sock, struct msghdr *msg, | |
967 | + int size, int flags) | |
968 | +{ | |
969 | + return ccs_validate_socket(sock); | |
970 | +} | |
971 | + | |
972 | +/** | |
973 | + * ccs_socket_getsockname - Check permission for getsockname(). | |
974 | + * | |
975 | + * @sock: Pointer to "struct socket". | |
976 | + * | |
977 | + * Returns 0 on success, negative value otherwise. | |
978 | + */ | |
979 | +static int ccs_socket_getsockname(struct socket *sock) | |
980 | +{ | |
981 | + return ccs_validate_socket(sock); | |
982 | +} | |
983 | + | |
984 | +/** | |
985 | + * ccs_socket_getpeername - Check permission for getpeername(). | |
986 | + * | |
987 | + * @sock: Pointer to "struct socket". | |
988 | + * | |
989 | + * Returns 0 on success, negative value otherwise. | |
990 | + */ | |
991 | +static int ccs_socket_getpeername(struct socket *sock) | |
992 | +{ | |
993 | + return ccs_validate_socket(sock); | |
994 | +} | |
995 | + | |
996 | +/** | |
997 | + * ccs_socket_getsockopt - Check permission for getsockopt(). | |
998 | + * | |
999 | + * @sock: Pointer to "struct socket". | |
1000 | + * @level: Level. | |
1001 | + * @optname: Option's name, | |
1002 | + * | |
1003 | + * Returns 0 on success, negative value otherwise. | |
1004 | + */ | |
1005 | +static int ccs_socket_getsockopt(struct socket *sock, int level, int optname) | |
1006 | +{ | |
1007 | + return ccs_validate_socket(sock); | |
1008 | +} | |
1009 | + | |
1010 | +/** | |
1011 | + * ccs_socket_setsockopt - Check permission for setsockopt(). | |
1012 | + * | |
1013 | + * @sock: Pointer to "struct socket". | |
1014 | + * @level: Level. | |
1015 | + * @optname: Option's name, | |
1016 | + * | |
1017 | + * Returns 0 on success, negative value otherwise. | |
1018 | + */ | |
1019 | +static int ccs_socket_setsockopt(struct socket *sock, int level, int optname) | |
1020 | +{ | |
1021 | + return ccs_validate_socket(sock); | |
1022 | +} | |
1023 | + | |
1024 | +/** | |
1025 | + * ccs_socket_shutdown - Check permission for shutdown(). | |
1026 | + * | |
1027 | + * @sock: Pointer to "struct socket". | |
1028 | + * @how: Shutdown mode. | |
1029 | + * | |
1030 | + * Returns 0 on success, negative value otherwise. | |
1031 | + */ | |
1032 | +static int ccs_socket_shutdown(struct socket *sock, int how) | |
1033 | +{ | |
1034 | + return ccs_validate_socket(sock); | |
1035 | +} | |
1036 | + | |
1037 | +#define SOCKFS_MAGIC 0x534F434B | |
1038 | + | |
1039 | +/** | |
1040 | + * ccs_inode_free_security - Release memory associated with an inode. | |
1041 | + * | |
1042 | + * @inode: Pointer to "struct inode". | |
1043 | + * | |
1044 | + * Returns nothing. | |
1045 | + * | |
1046 | + * We use this hook for releasing memory associated with an accept()ed socket. | |
1047 | + */ | |
1048 | +static void ccs_inode_free_security(struct inode *inode) | |
1049 | +{ | |
1050 | + if (inode->i_sb && inode->i_sb->s_magic == SOCKFS_MAGIC) | |
1051 | + ccs_update_socket_tag(inode, 0); | |
1052 | +} | |
1053 | + | |
1054 | +#endif | |
1055 | + | |
1056 | +/** | |
1057 | + * ccs_sb_pivotroot - Check permission for pivot_root(). | |
1058 | + * | |
1059 | + * @old_path: Pointer to "struct path". | |
1060 | + * @new_path: Pointer to "struct path". | |
1061 | + * | |
1062 | + * Returns 0 on success, negative value otherwise. | |
1063 | + */ | |
1064 | +static int ccs_sb_pivotroot(const struct path *old_path, | |
1065 | + const struct path *new_path) | |
1066 | +{ | |
1067 | + return ccs_pivot_root_permission(old_path, new_path); | |
1068 | +} | |
1069 | + | |
1070 | +/** | |
1071 | + * ccs_sb_mount - Check permission for mount(). | |
1072 | + * | |
1073 | + * @dev_name: Name of device file. | |
1074 | + * @path: Pointer to "struct path". | |
1075 | + * @type: Name of filesystem type. Maybe NULL. | |
1076 | + * @flags: Mount options. | |
1077 | + * @data_page: Optional data. Maybe NULL. | |
1078 | + * | |
1079 | + * Returns 0 on success, negative value otherwise. | |
1080 | + */ | |
1081 | +static int ccs_sb_mount(const char *dev_name, const struct path *path, | |
1082 | + const char *type, unsigned long flags, void *data_page) | |
1083 | +{ | |
1084 | + return ccs_mount_permission(dev_name, path, type, flags, data_page); | |
1085 | +} | |
1086 | + | |
1087 | +/** | |
1088 | + * ccs_sb_umount - Check permission for umount(). | |
1089 | + * | |
1090 | + * @mnt: Pointer to "struct vfsmount". | |
1091 | + * @flags: Unmount flags. | |
1092 | + * | |
1093 | + * Returns 0 on success, negative value otherwise. | |
1094 | + */ | |
1095 | +static int ccs_sb_umount(struct vfsmount *mnt, int flags) | |
1096 | +{ | |
1097 | + return ccs_umount_permission(mnt, flags); | |
1098 | +} | |
1099 | + | |
1100 | +/** | |
1101 | + * ccs_file_fcntl - Check permission for fcntl(). | |
1102 | + * | |
1103 | + * @file: Pointer to "struct file". | |
1104 | + * @cmd: Command number. | |
1105 | + * @arg: Value for @cmd. | |
1106 | + * | |
1107 | + * Returns 0 on success, negative value otherwise. | |
1108 | + */ | |
1109 | +static int ccs_file_fcntl(struct file *file, unsigned int cmd, | |
1110 | + unsigned long arg) | |
1111 | +{ | |
1112 | + return ccs_fcntl_permission(file, cmd, arg); | |
1113 | +} | |
1114 | + | |
1115 | +/** | |
1116 | + * ccs_file_ioctl - Check permission for ioctl(). | |
1117 | + * | |
1118 | + * @filp: Pointer to "struct file". | |
1119 | + * @cmd: Command number. | |
1120 | + * @arg: Value for @cmd. | |
1121 | + * | |
1122 | + * Returns 0 on success, negative value otherwise. | |
1123 | + */ | |
1124 | +static int ccs_file_ioctl(struct file *filp, unsigned int cmd, | |
1125 | + unsigned long arg) | |
1126 | +{ | |
1127 | + return ccs_ioctl_permission(filp, cmd, arg); | |
1128 | +} | |
1129 | + | |
1130 | +#define MY_HOOK_INIT(HEAD, HOOK) \ | |
1131 | + { .head = &probe_dummy_security_hook_heads.HEAD, \ | |
1132 | + .hook = { .HEAD = HOOK } } | |
1133 | + | |
1134 | +static struct security_hook_list akari_hooks[] = { | |
1135 | + /* Security context allocator. */ | |
1136 | + MY_HOOK_INIT(cred_free, ccs_cred_free), | |
1137 | + MY_HOOK_INIT(cred_prepare, ccs_cred_prepare), | |
1138 | + MY_HOOK_INIT(cred_alloc_blank, ccs_cred_alloc_blank), | |
1139 | + MY_HOOK_INIT(cred_transfer, ccs_cred_transfer), | |
1140 | + MY_HOOK_INIT(task_create, ccs_task_create), | |
1141 | + /* Security context updater for successful execve(). */ | |
1142 | + MY_HOOK_INIT(bprm_check_security, ccs_bprm_check_security), | |
1143 | + MY_HOOK_INIT(bprm_committing_creds, ccs_bprm_committing_creds), | |
1144 | + /* Various permission checker. */ | |
1145 | + MY_HOOK_INIT(file_open, ccs_file_open), | |
1146 | + MY_HOOK_INIT(file_fcntl, ccs_file_fcntl), | |
1147 | + MY_HOOK_INIT(file_ioctl, ccs_file_ioctl), | |
1148 | + MY_HOOK_INIT(sb_pivotroot, ccs_sb_pivotroot), | |
1149 | + MY_HOOK_INIT(sb_mount, ccs_sb_mount), | |
1150 | + MY_HOOK_INIT(sb_umount, ccs_sb_umount), | |
1151 | +#ifdef CONFIG_SECURITY_PATH | |
1152 | + MY_HOOK_INIT(path_mknod, ccs_path_mknod), | |
1153 | + MY_HOOK_INIT(path_mkdir, ccs_path_mkdir), | |
1154 | + MY_HOOK_INIT(path_rmdir, ccs_path_rmdir), | |
1155 | + MY_HOOK_INIT(path_unlink, ccs_path_unlink), | |
1156 | + MY_HOOK_INIT(path_symlink, ccs_path_symlink), | |
1157 | + MY_HOOK_INIT(path_rename, ccs_path_rename), | |
1158 | + MY_HOOK_INIT(path_link, ccs_path_link), | |
1159 | + MY_HOOK_INIT(path_truncate, ccs_path_truncate), | |
1160 | + MY_HOOK_INIT(path_chmod, ccs_path_chmod), | |
1161 | + MY_HOOK_INIT(path_chown, ccs_path_chown), | |
1162 | + MY_HOOK_INIT(path_chroot, ccs_path_chroot), | |
1163 | +#else | |
1164 | + MY_HOOK_INIT(inode_mknod, ccs_inode_mknod), | |
1165 | + MY_HOOK_INIT(inode_mkdir, ccs_inode_mkdir), | |
1166 | + MY_HOOK_INIT(inode_rmdir, ccs_inode_rmdir), | |
1167 | + MY_HOOK_INIT(inode_unlink, ccs_inode_unlink), | |
1168 | + MY_HOOK_INIT(inode_symlink, ccs_inode_symlink), | |
1169 | + MY_HOOK_INIT(inode_rename, ccs_inode_rename), | |
1170 | + MY_HOOK_INIT(inode_link, ccs_inode_link), | |
1171 | + MY_HOOK_INIT(inode_create, ccs_inode_create), | |
1172 | + MY_HOOK_INIT(inode_setattr, ccs_inode_setattr), | |
1173 | +#endif | |
1174 | + MY_HOOK_INIT(inode_getattr, ccs_inode_getattr), | |
1175 | +#ifdef CONFIG_SECURITY_NETWORK | |
1176 | + MY_HOOK_INIT(socket_bind, ccs_socket_bind), | |
1177 | + MY_HOOK_INIT(socket_connect, ccs_socket_connect), | |
1178 | + MY_HOOK_INIT(socket_listen, ccs_socket_listen), | |
1179 | + MY_HOOK_INIT(socket_sendmsg, ccs_socket_sendmsg), | |
1180 | + MY_HOOK_INIT(socket_recvmsg, ccs_socket_recvmsg), | |
1181 | + MY_HOOK_INIT(socket_getsockname, ccs_socket_getsockname), | |
1182 | + MY_HOOK_INIT(socket_getpeername, ccs_socket_getpeername), | |
1183 | + MY_HOOK_INIT(socket_getsockopt, ccs_socket_getsockopt), | |
1184 | + MY_HOOK_INIT(socket_setsockopt, ccs_socket_setsockopt), | |
1185 | + MY_HOOK_INIT(socket_shutdown, ccs_socket_shutdown), | |
1186 | + MY_HOOK_INIT(socket_accept, ccs_socket_accept), | |
1187 | + MY_HOOK_INIT(inode_free_security, ccs_inode_free_security), | |
1188 | +#endif | |
1189 | +}; | |
1190 | + | |
1191 | +static inline void add_hook(struct security_hook_list *hook) | |
1192 | +{ | |
1193 | + list_add_tail_rcu(&hook->list, hook->head); | |
1194 | +} | |
1195 | + | |
1196 | +static void __init swap_hook(struct security_hook_list *hook, | |
1197 | + union security_list_options *original) | |
1198 | +{ | |
1199 | + struct list_head *list = hook->head; | |
1200 | + if (list_empty(list)) { | |
1201 | + add_hook(hook); | |
1202 | + } else { | |
1203 | + struct security_hook_list *shp = | |
1204 | + list_last_entry(list, struct security_hook_list, list); | |
1205 | + *original = shp->hook; | |
1206 | + smp_wmb(); | |
1207 | + shp->hook = hook->hook; | |
1208 | + } | |
1209 | +} | |
1210 | + | |
1211 | +/** | |
1212 | + * ccs_init - Initialize this module. | |
1213 | + * | |
1214 | + * Returns 0 on success, negative value otherwise. | |
1215 | + */ | |
1216 | +static int __init ccs_init(void) | |
1217 | +{ | |
1218 | + int idx; | |
1219 | + struct security_hook_heads *hooks = probe_security_hook_heads(); | |
1220 | + if (!hooks) | |
1221 | + goto out; | |
1222 | + for (idx = 0; idx < ARRAY_SIZE(akari_hooks); idx++) | |
1223 | + akari_hooks[idx].head = ((void *) hooks) | |
1224 | + + ((unsigned long) akari_hooks[idx].head) | |
1225 | + - ((unsigned long) &probe_dummy_security_hook_heads); | |
1226 | + ccsecurity_exports.find_task_by_vpid = probe_find_task_by_vpid(); | |
1227 | + if (!ccsecurity_exports.find_task_by_vpid) | |
1228 | + goto out; | |
1229 | + ccsecurity_exports.find_task_by_pid_ns = probe_find_task_by_pid_ns(); | |
1230 | + if (!ccsecurity_exports.find_task_by_pid_ns) | |
1231 | + goto out; | |
1232 | + ccsecurity_exports.d_absolute_path = probe_d_absolute_path(); | |
1233 | + if (!ccsecurity_exports.d_absolute_path) | |
1234 | + goto out; | |
1235 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) { | |
1236 | + INIT_LIST_HEAD(&ccs_cred_security_list[idx]); | |
1237 | + INIT_LIST_HEAD(&ccs_task_security_list[idx]); | |
1238 | + } | |
1239 | + ccs_main_init(); | |
1240 | + swap_hook(&akari_hooks[0], &original_cred_free); | |
1241 | + swap_hook(&akari_hooks[1], &original_cred_prepare); | |
1242 | + swap_hook(&akari_hooks[2], &original_cred_alloc_blank); | |
1243 | + for (idx = 3; idx < ARRAY_SIZE(akari_hooks); idx++) | |
1244 | + add_hook(&akari_hooks[idx]); | |
1245 | + printk(KERN_INFO "AKARI: 1.0.39 2019/08/20\n"); | |
1246 | + printk(KERN_INFO | |
1247 | + "Access Keeping And Regulating Instrument registered.\n"); | |
1248 | + return 0; | |
1249 | +out: | |
1250 | + return -EINVAL; | |
1251 | +} | |
1252 | + | |
1253 | +module_init(ccs_init); | |
1254 | +MODULE_LICENSE("GPL"); | |
1255 | + | |
1256 | +/** | |
1257 | + * ccs_used_by_cred - Check whether the given domain is in use or not. | |
1258 | + * | |
1259 | + * @domain: Pointer to "struct ccs_domain_info". | |
1260 | + * | |
1261 | + * Returns true if @domain is in use, false otherwise. | |
1262 | + * | |
1263 | + * Caller holds rcu_read_lock(). | |
1264 | + */ | |
1265 | +bool ccs_used_by_cred(const struct ccs_domain_info *domain) | |
1266 | +{ | |
1267 | + int idx; | |
1268 | + struct ccs_security *ptr; | |
1269 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) { | |
1270 | + struct list_head *list = &ccs_cred_security_list[idx]; | |
1271 | + list_for_each_entry_rcu(ptr, list, list) { | |
1272 | + struct ccs_execve *ee = ptr->ee; | |
1273 | + if (ptr->ccs_domain_info == domain || | |
1274 | + (ee && ee->previous_domain == domain)) { | |
1275 | + return true; | |
1276 | + } | |
1277 | + } | |
1278 | + } | |
1279 | + return false; | |
1280 | +} | |
1281 | + | |
1282 | +/** | |
1283 | + * ccs_add_task_security - Add "struct ccs_security" to list. | |
1284 | + * | |
1285 | + * @ptr: Pointer to "struct ccs_security". | |
1286 | + * @list: Pointer to "struct list_head". | |
1287 | + * | |
1288 | + * Returns nothing. | |
1289 | + */ | |
1290 | +static void ccs_add_task_security(struct ccs_security *ptr, | |
1291 | + struct list_head *list) | |
1292 | +{ | |
1293 | + unsigned long flags; | |
1294 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
1295 | + list_add_rcu(&ptr->list, list); | |
1296 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
1297 | +} | |
1298 | + | |
1299 | +/** | |
1300 | + * ccs_find_task_security - Find "struct ccs_security" for given task. | |
1301 | + * | |
1302 | + * @task: Pointer to "struct task_struct". | |
1303 | + * | |
1304 | + * Returns pointer to "struct ccs_security" on success, &ccs_oom_security on | |
1305 | + * out of memory, &ccs_default_security otherwise. | |
1306 | + * | |
1307 | + * If @task is current thread and "struct ccs_security" for current thread was | |
1308 | + * not found, I try to allocate it. But if allocation failed, current thread | |
1309 | + * will be killed by SIGKILL. Note that if current->pid == 1, sending SIGKILL | |
1310 | + * won't work. | |
1311 | + */ | |
1312 | +struct ccs_security *ccs_find_task_security(const struct task_struct *task) | |
1313 | +{ | |
1314 | + struct ccs_security *ptr; | |
1315 | + struct list_head *list = &ccs_task_security_list | |
1316 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
1317 | + /* Make sure INIT_LIST_HEAD() in ccs_mm_init() takes effect. */ | |
1318 | + while (!list->next) | |
1319 | + smp_rmb(); | |
1320 | + rcu_read_lock(); | |
1321 | + list_for_each_entry_rcu(ptr, list, list) { | |
1322 | + if (ptr->pid != task->pids[PIDTYPE_PID].pid) | |
1323 | + continue; | |
1324 | + rcu_read_unlock(); | |
1325 | + /* | |
1326 | + * Current thread needs to transit from old domain to new | |
1327 | + * domain before do_execve() succeeds in order to check | |
1328 | + * permission for interpreters and environment variables using | |
1329 | + * new domain's ACL rules. The domain transition has to be | |
1330 | + * visible from other CPU in order to allow interactive | |
1331 | + * enforcing mode. Also, the domain transition has to be | |
1332 | + * reverted if do_execve() failed. However, an LSM hook for | |
1333 | + * reverting domain transition is missing. | |
1334 | + * | |
1335 | + * security_prepare_creds() is called from prepare_creds() from | |
1336 | + * prepare_bprm_creds() from do_execve() before setting | |
1337 | + * current->in_execve flag, and current->in_execve flag is | |
1338 | + * cleared by the time next do_execve() request starts. | |
1339 | + * This means that we can emulate the missing LSM hook for | |
1340 | + * reverting domain transition, by calling this function from | |
1341 | + * security_prepare_creds(). | |
1342 | + * | |
1343 | + * If current->in_execve is not set but ptr->ccs_flags has | |
1344 | + * CCS_TASK_IS_IN_EXECVE set, it indicates that do_execve() | |
1345 | + * has failed and reverting domain transition is needed. | |
1346 | + */ | |
1347 | + if (task == current && | |
1348 | + (ptr->ccs_flags & CCS_TASK_IS_IN_EXECVE) && | |
1349 | + !current->in_execve) { | |
1350 | + ccs_debug_trace("4"); | |
1351 | + ccs_clear_execve(-1, ptr); | |
1352 | + } | |
1353 | + return ptr; | |
1354 | + } | |
1355 | + rcu_read_unlock(); | |
1356 | + if (task != current) { | |
1357 | + /* | |
1358 | + * If a thread does nothing after fork(), caller will reach | |
1359 | + * here because "struct ccs_security" for that thread is not | |
1360 | + * yet allocated. But that thread is keeping a snapshot of | |
1361 | + * "struct ccs_security" taken as of ccs_task_create() | |
1362 | + * associated with that thread's "struct cred". | |
1363 | + * | |
1364 | + * Since that snapshot will be used as initial data when that | |
1365 | + * thread allocates "struct ccs_security" for that thread, we | |
1366 | + * can return that snapshot rather than &ccs_default_security. | |
1367 | + * | |
1368 | + * Since this function is called by only ccs_select_one() and | |
1369 | + * ccs_read_pid() (via ccs_task_domain() and ccs_task_flags()), | |
1370 | + * it is guaranteed that caller has called rcu_read_lock() | |
1371 | + * (via ccs_tasklist_lock()) before finding this thread and | |
1372 | + * this thread is valid. Therefore, we can do __task_cred(task) | |
1373 | + * like get_robust_list() does. | |
1374 | + */ | |
1375 | + return ccs_find_cred_security(__task_cred(task)); | |
1376 | + } | |
1377 | + /* Use GFP_ATOMIC because caller may have called rcu_read_lock(). */ | |
1378 | + ptr = kzalloc(sizeof(*ptr), GFP_ATOMIC); | |
1379 | + if (!ptr) { | |
1380 | + printk(KERN_WARNING "Unable to allocate memory for pid=%u\n", | |
1381 | + task->pid); | |
1382 | + send_sig(SIGKILL, current, 0); | |
1383 | + return &ccs_oom_security; | |
1384 | + } | |
1385 | + *ptr = *ccs_find_cred_security(task->cred); | |
1386 | + /* We can shortcut because task == current. */ | |
1387 | + ptr->pid = get_pid(((struct task_struct *) task)-> | |
1388 | + pids[PIDTYPE_PID].pid); | |
1389 | + ptr->cred = NULL; | |
1390 | + ccs_add_task_security(ptr, list); | |
1391 | + return ptr; | |
1392 | +} | |
1393 | + | |
1394 | +/** | |
1395 | + * ccs_copy_cred_security - Allocate memory for new credentials. | |
1396 | + * | |
1397 | + * @new: Pointer to "struct cred". | |
1398 | + * @old: Pointer to "struct cred". | |
1399 | + * @gfp: Memory allocation flags. | |
1400 | + * | |
1401 | + * Returns 0 on success, negative value otherwise. | |
1402 | + */ | |
1403 | +static int ccs_copy_cred_security(const struct cred *new, | |
1404 | + const struct cred *old, gfp_t gfp) | |
1405 | +{ | |
1406 | + struct ccs_security *old_security = ccs_find_cred_security(old); | |
1407 | + struct ccs_security *new_security = | |
1408 | + kzalloc(sizeof(*new_security), gfp); | |
1409 | + if (!new_security) | |
1410 | + return -ENOMEM; | |
1411 | + *new_security = *old_security; | |
1412 | + new_security->cred = new; | |
1413 | + ccs_add_cred_security(new_security); | |
1414 | + return 0; | |
1415 | +} | |
1416 | + | |
1417 | +/** | |
1418 | + * ccs_find_cred_security - Find "struct ccs_security" for given credential. | |
1419 | + * | |
1420 | + * @cred: Pointer to "struct cred". | |
1421 | + * | |
1422 | + * Returns pointer to "struct ccs_security" on success, &ccs_default_security | |
1423 | + * otherwise. | |
1424 | + */ | |
1425 | +static struct ccs_security *ccs_find_cred_security(const struct cred *cred) | |
1426 | +{ | |
1427 | + struct ccs_security *ptr; | |
1428 | + struct list_head *list = &ccs_cred_security_list | |
1429 | + [hash_ptr((void *) cred, CCS_TASK_SECURITY_HASH_BITS)]; | |
1430 | + rcu_read_lock(); | |
1431 | + list_for_each_entry_rcu(ptr, list, list) { | |
1432 | + if (ptr->cred != cred) | |
1433 | + continue; | |
1434 | + rcu_read_unlock(); | |
1435 | + return ptr; | |
1436 | + } | |
1437 | + rcu_read_unlock(); | |
1438 | + return &ccs_default_security; | |
1439 | +} | |
1440 | + | |
1441 | +/** | |
1442 | + * ccs_task_security_gc - Do garbage collection for "struct task_struct". | |
1443 | + * | |
1444 | + * Returns nothing. | |
1445 | + * | |
1446 | + * Since security_task_free() is missing, I can't release memory associated | |
1447 | + * with "struct task_struct" when a task dies. Therefore, I hold a reference on | |
1448 | + * "struct pid" and runs garbage collection when associated | |
1449 | + * "struct task_struct" has gone. | |
1450 | + */ | |
1451 | +static void ccs_task_security_gc(void) | |
1452 | +{ | |
1453 | + static DEFINE_SPINLOCK(lock); | |
1454 | + static atomic_t gc_counter = ATOMIC_INIT(0); | |
1455 | + unsigned int idx; | |
1456 | + /* | |
1457 | + * If some process is doing execve(), try to garbage collection now. | |
1458 | + * We should kfree() memory associated with "struct ccs_security"->ee | |
1459 | + * as soon as execve() has completed in order to compensate for lack of | |
1460 | + * security_bprm_free() and security_task_free() hooks. | |
1461 | + * | |
1462 | + * Otherwise, reduce frequency for performance reason. | |
1463 | + */ | |
1464 | + if (!atomic_read(&ccs_in_execve_tasks) && | |
1465 | + atomic_inc_return(&gc_counter) < 1024) | |
1466 | + return; | |
1467 | + if (!spin_trylock(&lock)) | |
1468 | + return; | |
1469 | + atomic_set(&gc_counter, 0); | |
1470 | + rcu_read_lock(); | |
1471 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) { | |
1472 | + struct ccs_security *ptr; | |
1473 | + struct list_head *list = &ccs_task_security_list[idx]; | |
1474 | + list_for_each_entry_rcu(ptr, list, list) { | |
1475 | + if (pid_task(ptr->pid, PIDTYPE_PID)) | |
1476 | + continue; | |
1477 | + ccs_del_security(ptr); | |
1478 | + } | |
1479 | + } | |
1480 | + rcu_read_unlock(); | |
1481 | + spin_unlock(&lock); | |
1482 | +} |
@@ -0,0 +1,34 @@ | ||
1 | +/* | |
2 | + * lsm.c | |
3 | + * | |
4 | + * Copyright (C) 2010-2015 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | |
5 | + * | |
6 | + * Version: 1.0.39 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include <linux/version.h> | |
10 | +#include <linux/security.h> | |
11 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0) | |
12 | +#include "lsm-4.12.c" | |
13 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0) | |
14 | +#include "lsm-4.7.c" | |
15 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0) | |
16 | +#include "lsm-4.2.c" | |
17 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29) | |
18 | +#include "lsm-2.6.29.c" | |
19 | +/* | |
20 | + * AppArmor patch added "struct vfsmount *" to security_inode_\*() hooks. | |
21 | + * Detect it by checking whether D_PATH_DISCONNECT is defined or not. | |
22 | + * Also, there may be other kernels with "struct vfsmount *" added. | |
23 | + * If you got build failure, check security_inode_\*() hooks in | |
24 | + * include/linux/security.h. | |
25 | + */ | |
26 | +#elif defined(D_PATH_DISCONNECT) | |
27 | +#include "lsm-2.6.0-vfs.c" | |
28 | +#elif defined(CONFIG_SUSE_KERNEL) && LINUX_VERSION_CODE == KERNEL_VERSION(2, 6, 25) | |
29 | +#include "lsm-2.6.0-vfs.c" | |
30 | +#elif defined(CONFIG_SECURITY_APPARMOR) && LINUX_VERSION_CODE == KERNEL_VERSION(2, 6, 24) | |
31 | +#include "lsm-2.6.0-vfs.c" | |
32 | +#else | |
33 | +#include "lsm-2.6.0.c" | |
34 | +#endif |
@@ -0,0 +1,364 @@ | ||
1 | +/* | |
2 | + * security/ccsecurity/memory.c | |
3 | + * | |
4 | + * Copyright (C) 2005-2012 NTT DATA CORPORATION | |
5 | + * | |
6 | + * Version: 1.8.6 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include "internal.h" | |
10 | + | |
11 | +/* Use functions in lsm.c */ | |
12 | +#undef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
13 | + | |
14 | +/***** SECTION1: Constants definition *****/ | |
15 | + | |
16 | +/***** SECTION2: Structure definition *****/ | |
17 | + | |
18 | +/***** SECTION3: Prototype definition section *****/ | |
19 | + | |
20 | +bool ccs_memory_ok(const void *ptr, const unsigned int size); | |
21 | +const struct ccs_path_info *ccs_get_name(const char *name); | |
22 | +#ifdef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
23 | +struct ccs_security *ccs_find_task_security(const struct task_struct *task); | |
24 | +#endif | |
25 | +void *ccs_commit_ok(void *data, const unsigned int size); | |
26 | +void __init ccs_mm_init(void); | |
27 | +void ccs_warn_oom(const char *function); | |
28 | + | |
29 | +#ifdef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
30 | +static int __ccs_alloc_task_security(const struct task_struct *task); | |
31 | +static void __ccs_free_task_security(const struct task_struct *task); | |
32 | +static void ccs_add_task_security(struct ccs_security *ptr, | |
33 | + struct list_head *list); | |
34 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
35 | +static void ccs_rcu_free(struct rcu_head *rcu); | |
36 | +#else | |
37 | +static void ccs_rcu_free(void *arg); | |
38 | +#endif | |
39 | +#endif | |
40 | + | |
41 | +/***** SECTION4: Standalone functions section *****/ | |
42 | + | |
43 | +/***** SECTION5: Variables definition section *****/ | |
44 | + | |
45 | +/* Memoy currently used by policy/audit log/query. */ | |
46 | +unsigned int ccs_memory_used[CCS_MAX_MEMORY_STAT]; | |
47 | + | |
48 | +/* Memory quota for "policy"/"audit log"/"query". */ | |
49 | +unsigned int ccs_memory_quota[CCS_MAX_MEMORY_STAT]; | |
50 | + | |
51 | +/* The list for "struct ccs_name". */ | |
52 | +struct list_head ccs_name_list[CCS_MAX_HASH]; | |
53 | + | |
54 | +#ifdef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
55 | + | |
56 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
57 | +static struct ccs_security ccs_oom_security = { | |
58 | + .ccs_domain_info = &ccs_kernel_domain | |
59 | +}; | |
60 | + | |
61 | +/* Dummy security context for avoiding NULL pointer dereference. */ | |
62 | +static struct ccs_security ccs_default_security = { | |
63 | + .ccs_domain_info = &ccs_kernel_domain | |
64 | +}; | |
65 | + | |
66 | +/* List of "struct ccs_security". */ | |
67 | +struct list_head ccs_task_security_list[CCS_MAX_TASK_SECURITY_HASH]; | |
68 | +/* Lock for protecting ccs_task_security_list[]. */ | |
69 | +static DEFINE_SPINLOCK(ccs_task_security_list_lock); | |
70 | + | |
71 | +#endif | |
72 | + | |
73 | +/***** SECTION6: Dependent functions section *****/ | |
74 | + | |
75 | +/** | |
76 | + * ccs_warn_oom - Print out of memory warning message. | |
77 | + * | |
78 | + * @function: Function's name. | |
79 | + * | |
80 | + * Returns nothing. | |
81 | + */ | |
82 | +void ccs_warn_oom(const char *function) | |
83 | +{ | |
84 | + /* Reduce error messages. */ | |
85 | + static pid_t ccs_last_pid; | |
86 | + const pid_t pid = current->pid; | |
87 | + if (ccs_last_pid != pid) { | |
88 | + printk(KERN_WARNING "ERROR: Out of memory at %s.\n", | |
89 | + function); | |
90 | + ccs_last_pid = pid; | |
91 | + } | |
92 | + if (!ccs_policy_loaded) | |
93 | + panic("MAC Initialization failed.\n"); | |
94 | +} | |
95 | + | |
96 | +/** | |
97 | + * ccs_memory_ok - Check memory quota. | |
98 | + * | |
99 | + * @ptr: Pointer to allocated memory. Maybe NULL. | |
100 | + * @size: Size in byte. Not used if @ptr is NULL. | |
101 | + * | |
102 | + * Returns true if @ptr is not NULL and quota not exceeded, false otherwise. | |
103 | + * | |
104 | + * Caller holds ccs_policy_lock mutex. | |
105 | + */ | |
106 | +bool ccs_memory_ok(const void *ptr, const unsigned int size) | |
107 | +{ | |
108 | + if (ptr) { | |
109 | + const size_t s = ccs_round2(size); | |
110 | + ccs_memory_used[CCS_MEMORY_POLICY] += s; | |
111 | + if (!ccs_memory_quota[CCS_MEMORY_POLICY] || | |
112 | + ccs_memory_used[CCS_MEMORY_POLICY] <= | |
113 | + ccs_memory_quota[CCS_MEMORY_POLICY]) | |
114 | + return true; | |
115 | + ccs_memory_used[CCS_MEMORY_POLICY] -= s; | |
116 | + } | |
117 | + ccs_warn_oom(__func__); | |
118 | + return false; | |
119 | +} | |
120 | + | |
121 | +/** | |
122 | + * ccs_commit_ok - Allocate memory and check memory quota. | |
123 | + * | |
124 | + * @data: Data to copy from. | |
125 | + * @size: Size in byte. | |
126 | + * | |
127 | + * Returns pointer to allocated memory on success, NULL otherwise. | |
128 | + * @data is zero-cleared on success. | |
129 | + * | |
130 | + * Caller holds ccs_policy_lock mutex. | |
131 | + */ | |
132 | +void *ccs_commit_ok(void *data, const unsigned int size) | |
133 | +{ | |
134 | + void *ptr = kmalloc(size, CCS_GFP_FLAGS); | |
135 | + if (ccs_memory_ok(ptr, size)) { | |
136 | + memmove(ptr, data, size); | |
137 | + memset(data, 0, size); | |
138 | + return ptr; | |
139 | + } | |
140 | + kfree(ptr); | |
141 | + return NULL; | |
142 | +} | |
143 | + | |
144 | +/** | |
145 | + * ccs_get_name - Allocate memory for string data. | |
146 | + * | |
147 | + * @name: The string to store into the permernent memory. | |
148 | + * | |
149 | + * Returns pointer to "struct ccs_path_info" on success, NULL otherwise. | |
150 | + */ | |
151 | +const struct ccs_path_info *ccs_get_name(const char *name) | |
152 | +{ | |
153 | + struct ccs_name *ptr; | |
154 | + unsigned int hash; | |
155 | + int len; | |
156 | + int allocated_len; | |
157 | + struct list_head *head; | |
158 | + | |
159 | + if (!name) | |
160 | + return NULL; | |
161 | + len = strlen(name) + 1; | |
162 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0) | |
163 | + hash = full_name_hash(NULL, name, len - 1); | |
164 | +#else | |
165 | + hash = full_name_hash((const unsigned char *) name, len - 1); | |
166 | +#endif | |
167 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0) || defined(RHEL_MAJOR) | |
168 | + head = &ccs_name_list[hash_long(hash, CCS_HASH_BITS)]; | |
169 | +#else | |
170 | + head = &ccs_name_list[hash % CCS_MAX_HASH]; | |
171 | +#endif | |
172 | + if (mutex_lock_interruptible(&ccs_policy_lock)) | |
173 | + return NULL; | |
174 | + list_for_each_entry(ptr, head, head.list) { | |
175 | + if (hash != ptr->entry.hash || strcmp(name, ptr->entry.name) || | |
176 | + atomic_read(&ptr->head.users) == CCS_GC_IN_PROGRESS) | |
177 | + continue; | |
178 | + atomic_inc(&ptr->head.users); | |
179 | + goto out; | |
180 | + } | |
181 | + allocated_len = sizeof(*ptr) + len; | |
182 | + ptr = kzalloc(allocated_len, CCS_GFP_FLAGS); | |
183 | + if (ccs_memory_ok(ptr, allocated_len)) { | |
184 | + ptr->entry.name = ((char *) ptr) + sizeof(*ptr); | |
185 | + memmove((char *) ptr->entry.name, name, len); | |
186 | + atomic_set(&ptr->head.users, 1); | |
187 | + ccs_fill_path_info(&ptr->entry); | |
188 | + ptr->size = allocated_len; | |
189 | + list_add_tail(&ptr->head.list, head); | |
190 | + } else { | |
191 | + kfree(ptr); | |
192 | + ptr = NULL; | |
193 | + } | |
194 | +out: | |
195 | + mutex_unlock(&ccs_policy_lock); | |
196 | + return ptr ? &ptr->entry : NULL; | |
197 | +} | |
198 | + | |
199 | +#ifdef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
200 | + | |
201 | +/** | |
202 | + * ccs_add_task_security - Add "struct ccs_security" to list. | |
203 | + * | |
204 | + * @ptr: Pointer to "struct ccs_security". | |
205 | + * @list: Pointer to "struct list_head". | |
206 | + * | |
207 | + * Returns nothing. | |
208 | + */ | |
209 | +static void ccs_add_task_security(struct ccs_security *ptr, | |
210 | + struct list_head *list) | |
211 | +{ | |
212 | + unsigned long flags; | |
213 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
214 | + list_add_rcu(&ptr->list, list); | |
215 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
216 | +} | |
217 | + | |
218 | +/** | |
219 | + * __ccs_alloc_task_security - Allocate memory for new tasks. | |
220 | + * | |
221 | + * @task: Pointer to "struct task_struct". | |
222 | + * | |
223 | + * Returns 0 on success, negative value otherwise. | |
224 | + */ | |
225 | +static int __ccs_alloc_task_security(const struct task_struct *task) | |
226 | +{ | |
227 | + struct ccs_security *old_security = ccs_current_security(); | |
228 | + struct ccs_security *new_security = kzalloc(sizeof(*new_security), | |
229 | + GFP_KERNEL); | |
230 | + struct list_head *list = &ccs_task_security_list | |
231 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
232 | + if (!new_security) | |
233 | + return -ENOMEM; | |
234 | + new_security->task = task; | |
235 | + new_security->ccs_domain_info = old_security->ccs_domain_info; | |
236 | + new_security->ccs_flags = old_security->ccs_flags; | |
237 | + ccs_add_task_security(new_security, list); | |
238 | + return 0; | |
239 | +} | |
240 | + | |
241 | +/** | |
242 | + * ccs_find_task_security - Find "struct ccs_security" for given task. | |
243 | + * | |
244 | + * @task: Pointer to "struct task_struct". | |
245 | + * | |
246 | + * Returns pointer to "struct ccs_security" on success, &ccs_oom_security on | |
247 | + * out of memory, &ccs_default_security otherwise. | |
248 | + * | |
249 | + * If @task is current thread and "struct ccs_security" for current thread was | |
250 | + * not found, I try to allocate it. But if allocation failed, current thread | |
251 | + * will be killed by SIGKILL. Note that if current->pid == 1, sending SIGKILL | |
252 | + * won't work. | |
253 | + */ | |
254 | +struct ccs_security *ccs_find_task_security(const struct task_struct *task) | |
255 | +{ | |
256 | + struct ccs_security *ptr; | |
257 | + struct list_head *list = &ccs_task_security_list | |
258 | + [hash_ptr((void *) task, CCS_TASK_SECURITY_HASH_BITS)]; | |
259 | + /* Make sure INIT_LIST_HEAD() in ccs_mm_init() takes effect. */ | |
260 | + while (!list->next) | |
261 | + smp_rmb(); | |
262 | + rcu_read_lock(); | |
263 | + list_for_each_entry_rcu(ptr, list, list) { | |
264 | + if (ptr->task != task) | |
265 | + continue; | |
266 | + rcu_read_unlock(); | |
267 | + return ptr; | |
268 | + } | |
269 | + rcu_read_unlock(); | |
270 | + if (task != current) | |
271 | + return &ccs_default_security; | |
272 | + /* Use GFP_ATOMIC because caller may have called rcu_read_lock(). */ | |
273 | + ptr = kzalloc(sizeof(*ptr), GFP_ATOMIC); | |
274 | + if (!ptr) { | |
275 | + printk(KERN_WARNING "Unable to allocate memory for pid=%u\n", | |
276 | + task->pid); | |
277 | + send_sig(SIGKILL, current, 0); | |
278 | + return &ccs_oom_security; | |
279 | + } | |
280 | + *ptr = ccs_default_security; | |
281 | + ptr->task = task; | |
282 | + ccs_add_task_security(ptr, list); | |
283 | + return ptr; | |
284 | +} | |
285 | + | |
286 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
287 | + | |
288 | +/** | |
289 | + * ccs_rcu_free - RCU callback for releasing "struct ccs_security". | |
290 | + * | |
291 | + * @rcu: Pointer to "struct rcu_head". | |
292 | + * | |
293 | + * Returns nothing. | |
294 | + */ | |
295 | +static void ccs_rcu_free(struct rcu_head *rcu) | |
296 | +{ | |
297 | + struct ccs_security *ptr = container_of(rcu, typeof(*ptr), rcu); | |
298 | + kfree(ptr); | |
299 | +} | |
300 | + | |
301 | +#else | |
302 | + | |
303 | +/** | |
304 | + * ccs_rcu_free - RCU callback for releasing "struct ccs_security". | |
305 | + * | |
306 | + * @arg: Pointer to "void". | |
307 | + * | |
308 | + * Returns nothing. | |
309 | + */ | |
310 | +static void ccs_rcu_free(void *arg) | |
311 | +{ | |
312 | + struct ccs_security *ptr = arg; | |
313 | + kfree(ptr); | |
314 | +} | |
315 | + | |
316 | +#endif | |
317 | + | |
318 | +/** | |
319 | + * __ccs_free_task_security - Release memory associated with "struct task_struct". | |
320 | + * | |
321 | + * @task: Pointer to "struct task_struct". | |
322 | + * | |
323 | + * Returns nothing. | |
324 | + */ | |
325 | +static void __ccs_free_task_security(const struct task_struct *task) | |
326 | +{ | |
327 | + unsigned long flags; | |
328 | + struct ccs_security *ptr = ccs_find_task_security(task); | |
329 | + if (ptr == &ccs_default_security || ptr == &ccs_oom_security) | |
330 | + return; | |
331 | + spin_lock_irqsave(&ccs_task_security_list_lock, flags); | |
332 | + list_del_rcu(&ptr->list); | |
333 | + spin_unlock_irqrestore(&ccs_task_security_list_lock, flags); | |
334 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 8) | |
335 | + call_rcu(&ptr->rcu, ccs_rcu_free); | |
336 | +#else | |
337 | + call_rcu(&ptr->rcu, ccs_rcu_free, ptr); | |
338 | +#endif | |
339 | +} | |
340 | + | |
341 | +#endif | |
342 | + | |
343 | +/** | |
344 | + * ccs_mm_init - Initialize mm related code. | |
345 | + * | |
346 | + * Returns nothing. | |
347 | + */ | |
348 | +void __init ccs_mm_init(void) | |
349 | +{ | |
350 | + int idx; | |
351 | + for (idx = 0; idx < CCS_MAX_HASH; idx++) | |
352 | + INIT_LIST_HEAD(&ccs_name_list[idx]); | |
353 | +#ifdef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
354 | + for (idx = 0; idx < CCS_MAX_TASK_SECURITY_HASH; idx++) | |
355 | + INIT_LIST_HEAD(&ccs_task_security_list[idx]); | |
356 | +#endif | |
357 | + smp_wmb(); /* Avoid out of order execution. */ | |
358 | +#ifdef CONFIG_CCSECURITY_USE_EXTERNAL_TASK_SECURITY | |
359 | + ccsecurity_ops.alloc_task_security = __ccs_alloc_task_security; | |
360 | + ccsecurity_ops.free_task_security = __ccs_free_task_security; | |
361 | +#endif | |
362 | + ccs_kernel_domain.domainname = ccs_get_name("<kernel>"); | |
363 | + list_add_tail_rcu(&ccs_kernel_domain.list, &ccs_domain_list); | |
364 | +} |
@@ -0,0 +1,5087 @@ | ||
1 | +/* | |
2 | + * security/ccsecurity/permission.c | |
3 | + * | |
4 | + * Copyright (C) 2005-2012 NTT DATA CORPORATION | |
5 | + * | |
6 | + * Version: 1.8.6 2019/08/20 | |
7 | + */ | |
8 | + | |
9 | +#include "internal.h" | |
10 | + | |
11 | +/***** SECTION1: Constants definition *****/ | |
12 | + | |
13 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 32) | |
14 | + | |
15 | +/* | |
16 | + * may_open() receives open flags modified by open_to_namei_flags() until | |
17 | + * 2.6.32. We stop here in case some distributions backported ACC_MODE changes, | |
18 | + * for we can't determine whether may_open() receives open flags modified by | |
19 | + * open_to_namei_flags() or not. | |
20 | + */ | |
21 | +#ifdef ACC_MODE | |
22 | +#error ACC_MODE already defined. | |
23 | +#endif | |
24 | +#define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE]) | |
25 | + | |
26 | +#if defined(RHEL_MAJOR) && RHEL_MAJOR == 6 | |
27 | +/* RHEL6 passes unmodified flags since 2.6.32-71.14.1.el6 . */ | |
28 | +#undef ACC_MODE | |
29 | +#define ACC_MODE(x) ("\004\002\006"[(x)&O_ACCMODE]) | |
30 | +#endif | |
31 | + | |
32 | +#endif | |
33 | + | |
34 | +/* String table for special mount operations. */ | |
35 | +static const char * const ccs_mounts[CCS_MAX_SPECIAL_MOUNT] = { | |
36 | + [CCS_MOUNT_BIND] = "--bind", | |
37 | + [CCS_MOUNT_MOVE] = "--move", | |
38 | + [CCS_MOUNT_REMOUNT] = "--remount", | |
39 | + [CCS_MOUNT_MAKE_UNBINDABLE] = "--make-unbindable", | |
40 | + [CCS_MOUNT_MAKE_PRIVATE] = "--make-private", | |
41 | + [CCS_MOUNT_MAKE_SLAVE] = "--make-slave", | |
42 | + [CCS_MOUNT_MAKE_SHARED] = "--make-shared", | |
43 | +}; | |
44 | + | |
45 | +/* Mapping table from "enum ccs_path_acl_index" to "enum ccs_mac_index". */ | |
46 | +static const u8 ccs_p2mac[CCS_MAX_PATH_OPERATION] = { | |
47 | + [CCS_TYPE_EXECUTE] = CCS_MAC_FILE_EXECUTE, | |
48 | + [CCS_TYPE_READ] = CCS_MAC_FILE_OPEN, | |
49 | + [CCS_TYPE_WRITE] = CCS_MAC_FILE_OPEN, | |
50 | + [CCS_TYPE_APPEND] = CCS_MAC_FILE_OPEN, | |
51 | + [CCS_TYPE_UNLINK] = CCS_MAC_FILE_UNLINK, | |
52 | +#ifdef CONFIG_CCSECURITY_FILE_GETATTR | |
53 | + [CCS_TYPE_GETATTR] = CCS_MAC_FILE_GETATTR, | |
54 | +#endif | |
55 | + [CCS_TYPE_RMDIR] = CCS_MAC_FILE_RMDIR, | |
56 | + [CCS_TYPE_TRUNCATE] = CCS_MAC_FILE_TRUNCATE, | |
57 | + [CCS_TYPE_SYMLINK] = CCS_MAC_FILE_SYMLINK, | |
58 | + [CCS_TYPE_CHROOT] = CCS_MAC_FILE_CHROOT, | |
59 | + [CCS_TYPE_UMOUNT] = CCS_MAC_FILE_UMOUNT, | |
60 | +}; | |
61 | + | |
62 | +/* Mapping table from "enum ccs_mkdev_acl_index" to "enum ccs_mac_index". */ | |
63 | +const u8 ccs_pnnn2mac[CCS_MAX_MKDEV_OPERATION] = { | |
64 | + [CCS_TYPE_MKBLOCK] = CCS_MAC_FILE_MKBLOCK, | |
65 | + [CCS_TYPE_MKCHAR] = CCS_MAC_FILE_MKCHAR, | |
66 | +}; | |
67 | + | |
68 | +/* Mapping table from "enum ccs_path2_acl_index" to "enum ccs_mac_index". */ | |
69 | +const u8 ccs_pp2mac[CCS_MAX_PATH2_OPERATION] = { | |
70 | + [CCS_TYPE_LINK] = CCS_MAC_FILE_LINK, | |
71 | + [CCS_TYPE_RENAME] = CCS_MAC_FILE_RENAME, | |
72 | + [CCS_TYPE_PIVOT_ROOT] = CCS_MAC_FILE_PIVOT_ROOT, | |
73 | +}; | |
74 | + | |
75 | +/* | |
76 | + * Mapping table from "enum ccs_path_number_acl_index" to "enum ccs_mac_index". | |
77 | + */ | |
78 | +const u8 ccs_pn2mac[CCS_MAX_PATH_NUMBER_OPERATION] = { | |
79 | + [CCS_TYPE_CREATE] = CCS_MAC_FILE_CREATE, | |
80 | + [CCS_TYPE_MKDIR] = CCS_MAC_FILE_MKDIR, | |
81 | + [CCS_TYPE_MKFIFO] = CCS_MAC_FILE_MKFIFO, | |
82 | + [CCS_TYPE_MKSOCK] = CCS_MAC_FILE_MKSOCK, | |
83 | + [CCS_TYPE_IOCTL] = CCS_MAC_FILE_IOCTL, | |
84 | + [CCS_TYPE_CHMOD] = CCS_MAC_FILE_CHMOD, | |
85 | + [CCS_TYPE_CHOWN] = CCS_MAC_FILE_CHOWN, | |
86 | + [CCS_TYPE_CHGRP] = CCS_MAC_FILE_CHGRP, | |
87 | +}; | |
88 | + | |
89 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
90 | + | |
91 | +/* | |
92 | + * Mapping table from "enum ccs_network_acl_index" to "enum ccs_mac_index" for | |
93 | + * inet domain socket. | |
94 | + */ | |
95 | +static const u8 ccs_inet2mac[CCS_SOCK_MAX][CCS_MAX_NETWORK_OPERATION] = { | |
96 | + [SOCK_STREAM] = { | |
97 | + [CCS_NETWORK_BIND] = CCS_MAC_NETWORK_INET_STREAM_BIND, | |
98 | + [CCS_NETWORK_LISTEN] = CCS_MAC_NETWORK_INET_STREAM_LISTEN, | |
99 | + [CCS_NETWORK_CONNECT] = CCS_MAC_NETWORK_INET_STREAM_CONNECT, | |
100 | + [CCS_NETWORK_ACCEPT] = CCS_MAC_NETWORK_INET_STREAM_ACCEPT, | |
101 | + }, | |
102 | + [SOCK_DGRAM] = { | |
103 | + [CCS_NETWORK_BIND] = CCS_MAC_NETWORK_INET_DGRAM_BIND, | |
104 | + [CCS_NETWORK_SEND] = CCS_MAC_NETWORK_INET_DGRAM_SEND, | |
105 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
106 | + [CCS_NETWORK_RECV] = CCS_MAC_NETWORK_INET_DGRAM_RECV, | |
107 | +#endif | |
108 | + }, | |
109 | + [SOCK_RAW] = { | |
110 | + [CCS_NETWORK_BIND] = CCS_MAC_NETWORK_INET_RAW_BIND, | |
111 | + [CCS_NETWORK_SEND] = CCS_MAC_NETWORK_INET_RAW_SEND, | |
112 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
113 | + [CCS_NETWORK_RECV] = CCS_MAC_NETWORK_INET_RAW_RECV, | |
114 | +#endif | |
115 | + }, | |
116 | +}; | |
117 | + | |
118 | +/* | |
119 | + * Mapping table from "enum ccs_network_acl_index" to "enum ccs_mac_index" for | |
120 | + * unix domain socket. | |
121 | + */ | |
122 | +static const u8 ccs_unix2mac[CCS_SOCK_MAX][CCS_MAX_NETWORK_OPERATION] = { | |
123 | + [SOCK_STREAM] = { | |
124 | + [CCS_NETWORK_BIND] = CCS_MAC_NETWORK_UNIX_STREAM_BIND, | |
125 | + [CCS_NETWORK_LISTEN] = CCS_MAC_NETWORK_UNIX_STREAM_LISTEN, | |
126 | + [CCS_NETWORK_CONNECT] = CCS_MAC_NETWORK_UNIX_STREAM_CONNECT, | |
127 | + [CCS_NETWORK_ACCEPT] = CCS_MAC_NETWORK_UNIX_STREAM_ACCEPT, | |
128 | + }, | |
129 | + [SOCK_DGRAM] = { | |
130 | + [CCS_NETWORK_BIND] = CCS_MAC_NETWORK_UNIX_DGRAM_BIND, | |
131 | + [CCS_NETWORK_SEND] = CCS_MAC_NETWORK_UNIX_DGRAM_SEND, | |
132 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
133 | + [CCS_NETWORK_RECV] = CCS_MAC_NETWORK_UNIX_DGRAM_RECV, | |
134 | +#endif | |
135 | + }, | |
136 | + [SOCK_SEQPACKET] = { | |
137 | + [CCS_NETWORK_BIND] = CCS_MAC_NETWORK_UNIX_SEQPACKET_BIND, | |
138 | + [CCS_NETWORK_LISTEN] = CCS_MAC_NETWORK_UNIX_SEQPACKET_LISTEN, | |
139 | + [CCS_NETWORK_CONNECT] = CCS_MAC_NETWORK_UNIX_SEQPACKET_CONNECT, | |
140 | + [CCS_NETWORK_ACCEPT] = CCS_MAC_NETWORK_UNIX_SEQPACKET_ACCEPT, | |
141 | + }, | |
142 | +}; | |
143 | + | |
144 | +#endif | |
145 | + | |
146 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
147 | + | |
148 | +/* | |
149 | + * Mapping table from "enum ccs_capability_acl_index" to "enum ccs_mac_index". | |
150 | + */ | |
151 | +const u8 ccs_c2mac[CCS_MAX_CAPABILITY_INDEX] = { | |
152 | + [CCS_USE_ROUTE_SOCKET] = CCS_MAC_CAPABILITY_USE_ROUTE_SOCKET, | |
153 | + [CCS_USE_PACKET_SOCKET] = CCS_MAC_CAPABILITY_USE_PACKET_SOCKET, | |
154 | + [CCS_SYS_REBOOT] = CCS_MAC_CAPABILITY_SYS_REBOOT, | |
155 | + [CCS_SYS_VHANGUP] = CCS_MAC_CAPABILITY_SYS_VHANGUP, | |
156 | + [CCS_SYS_SETTIME] = CCS_MAC_CAPABILITY_SYS_SETTIME, | |
157 | + [CCS_SYS_NICE] = CCS_MAC_CAPABILITY_SYS_NICE, | |
158 | + [CCS_SYS_SETHOSTNAME] = CCS_MAC_CAPABILITY_SYS_SETHOSTNAME, | |
159 | + [CCS_USE_KERNEL_MODULE] = CCS_MAC_CAPABILITY_USE_KERNEL_MODULE, | |
160 | + [CCS_SYS_KEXEC_LOAD] = CCS_MAC_CAPABILITY_SYS_KEXEC_LOAD, | |
161 | + [CCS_SYS_PTRACE] = CCS_MAC_CAPABILITY_SYS_PTRACE, | |
162 | +}; | |
163 | + | |
164 | +#endif | |
165 | + | |
166 | +/***** SECTION2: Structure definition *****/ | |
167 | + | |
168 | +/* Structure for holding inet domain socket's address. */ | |
169 | +struct ccs_inet_addr_info { | |
170 | + u16 port; /* In network byte order. */ | |
171 | + const u32 *address; /* In network byte order. */ | |
172 | + bool is_ipv6; | |
173 | +}; | |
174 | + | |
175 | +/* Structure for holding unix domain socket's address. */ | |
176 | +struct ccs_unix_addr_info { | |
177 | + u8 *addr; /* This may not be '\0' terminated string. */ | |
178 | + unsigned int addr_len; | |
179 | +}; | |
180 | + | |
181 | +/* Structure for holding socket address. */ | |
182 | +struct ccs_addr_info { | |
183 | + u8 protocol; | |
184 | + u8 operation; | |
185 | + struct ccs_inet_addr_info inet; | |
186 | + struct ccs_unix_addr_info unix0; | |
187 | +}; | |
188 | + | |
189 | +/***** SECTION3: Prototype definition section *****/ | |
190 | + | |
191 | +bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, | |
192 | + struct ccs_page_dump *dump); | |
193 | +void ccs_get_attributes(struct ccs_obj_info *obj); | |
194 | + | |
195 | +static bool ccs_alphabet_char(const char c); | |
196 | +static bool ccs_argv(const unsigned int index, const char *arg_ptr, | |
197 | + const int argc, const struct ccs_argv *argv, u8 *checked); | |
198 | +static bool ccs_byte_range(const char *str); | |
199 | +static bool ccs_check_entry(struct ccs_request_info *r, | |
200 | + struct ccs_acl_info *ptr); | |
201 | +static bool ccs_check_mkdev_acl(struct ccs_request_info *r, | |
202 | + const struct ccs_acl_info *ptr); | |
203 | +static bool ccs_check_mount_acl(struct ccs_request_info *r, | |
204 | + const struct ccs_acl_info *ptr); | |
205 | +static bool ccs_check_path2_acl(struct ccs_request_info *r, | |
206 | + const struct ccs_acl_info *ptr); | |
207 | +static bool ccs_check_path_acl(struct ccs_request_info *r, | |
208 | + const struct ccs_acl_info *ptr); | |
209 | +static bool ccs_check_path_number_acl(struct ccs_request_info *r, | |
210 | + const struct ccs_acl_info *ptr); | |
211 | +static bool ccs_compare_number_union(const unsigned long value, | |
212 | + const struct ccs_number_union *ptr); | |
213 | +static bool ccs_condition(struct ccs_request_info *r, | |
214 | + const struct ccs_condition *cond); | |
215 | +static bool ccs_decimal(const char c); | |
216 | +static bool ccs_envp(const char *env_name, const char *env_value, | |
217 | + const int envc, const struct ccs_envp *envp, u8 *checked); | |
218 | +static bool ccs_file_matches_pattern(const char *filename, | |
219 | + const char *filename_end, | |
220 | + const char *pattern, | |
221 | + const char *pattern_end); | |
222 | +static bool ccs_file_matches_pattern2(const char *filename, | |
223 | + const char *filename_end, | |
224 | + const char *pattern, | |
225 | + const char *pattern_end); | |
226 | +static bool ccs_get_realpath(struct ccs_path_info *buf, struct path *path); | |
227 | +static bool ccs_hexadecimal(const char c); | |
228 | +static bool ccs_number_matches_group(const unsigned long min, | |
229 | + const unsigned long max, | |
230 | + const struct ccs_group *group); | |
231 | +static bool ccs_path_matches_pattern(const struct ccs_path_info *filename, | |
232 | + const struct ccs_path_info *pattern); | |
233 | +static bool ccs_path_matches_pattern2(const char *f, const char *p); | |
234 | +static bool ccs_scan_bprm(struct ccs_execve *ee, const u16 argc, | |
235 | + const struct ccs_argv *argv, const u16 envc, | |
236 | + const struct ccs_envp *envp); | |
237 | +static bool ccs_scan_exec_realpath(struct file *file, | |
238 | + const struct ccs_name_union *ptr, | |
239 | + const bool match); | |
240 | +static bool ccs_scan_transition(const struct list_head *list, | |
241 | + const struct ccs_path_info *domainname, | |
242 | + const struct ccs_path_info *program, | |
243 | + const char *last_name, | |
244 | + const enum ccs_transition_type type); | |
245 | +static const char *ccs_last_word(const char *name); | |
246 | +static const struct ccs_path_info *ccs_compare_name_union | |
247 | +(const struct ccs_path_info *name, const struct ccs_name_union *ptr); | |
248 | +static const struct ccs_path_info *ccs_path_matches_group | |
249 | +(const struct ccs_path_info *pathname, const struct ccs_group *group); | |
250 | +static enum ccs_transition_type ccs_transition_type | |
251 | +(const struct ccs_policy_namespace *ns, const struct ccs_path_info *domainname, | |
252 | + const struct ccs_path_info *program); | |
253 | +static int __ccs_chmod_permission(struct dentry *dentry, | |
254 | + struct vfsmount *vfsmnt, mode_t mode); | |
255 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
256 | +static int __ccs_chown_permission(struct dentry *dentry, | |
257 | + struct vfsmount *vfsmnt, kuid_t user, | |
258 | + kgid_t group); | |
259 | +#else | |
260 | +static int __ccs_chown_permission(struct dentry *dentry, | |
261 | + struct vfsmount *vfsmnt, uid_t user, | |
262 | + gid_t group); | |
263 | +#endif | |
264 | +static int __ccs_chroot_permission(const struct path *path); | |
265 | +static int __ccs_fcntl_permission(struct file *file, unsigned int cmd, | |
266 | + unsigned long arg); | |
267 | +static int __ccs_ioctl_permission(struct file *filp, unsigned int cmd, | |
268 | + unsigned long arg); | |
269 | +static int __ccs_link_permission(struct dentry *old_dentry, | |
270 | + struct dentry *new_dentry, | |
271 | + struct vfsmount *mnt); | |
272 | +static int __ccs_mkdir_permission(struct dentry *dentry, struct vfsmount *mnt, | |
273 | + unsigned int mode); | |
274 | +static int __ccs_mknod_permission(struct dentry *dentry, struct vfsmount *mnt, | |
275 | + const unsigned int mode, unsigned int dev); | |
276 | +static int __ccs_mount_permission(const char *dev_name, | |
277 | + const struct path *path, const char *type, | |
278 | + unsigned long flags, void *data_page); | |
279 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0) | |
280 | +static int __ccs_move_mount_permission(const struct path *from_path, | |
281 | + const struct path *to_path); | |
282 | +#endif | |
283 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30) | |
284 | +static int __ccs_open_exec_permission(struct dentry *dentry, | |
285 | + struct vfsmount *mnt); | |
286 | +#endif | |
287 | +static int __ccs_open_permission(struct dentry *dentry, struct vfsmount *mnt, | |
288 | + const int flag); | |
289 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) || (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33) && defined(CONFIG_SYSCTL_SYSCALL)) | |
290 | +static int __ccs_parse_table(int __user *name, int nlen, void __user *oldval, | |
291 | + void __user *newval, struct ctl_table *table); | |
292 | +#endif | |
293 | +static int __ccs_pivot_root_permission(const struct path *old_path, | |
294 | + const struct path *new_path); | |
295 | +static int __ccs_rename_permission(struct dentry *old_dentry, | |
296 | + struct dentry *new_dentry, | |
297 | + struct vfsmount *mnt); | |
298 | +static int __ccs_rmdir_permission(struct dentry *dentry, struct vfsmount *mnt); | |
299 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0) | |
300 | +static int __ccs_search_binary_handler(struct linux_binprm *bprm); | |
301 | +#else | |
302 | +static int __ccs_search_binary_handler(struct linux_binprm *bprm, | |
303 | + struct pt_regs *regs); | |
304 | +#endif | |
305 | +static int __ccs_symlink_permission(struct dentry *dentry, | |
306 | + struct vfsmount *mnt, const char *from); | |
307 | +static int __ccs_truncate_permission(struct dentry *dentry, | |
308 | + struct vfsmount *mnt); | |
309 | +static int __ccs_umount_permission(struct vfsmount *mnt, int flags); | |
310 | +static int __ccs_unlink_permission(struct dentry *dentry, | |
311 | + struct vfsmount *mnt); | |
312 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30) | |
313 | +static int __ccs_uselib_permission(struct dentry *dentry, | |
314 | + struct vfsmount *mnt); | |
315 | +#endif | |
316 | +static int ccs_execute_permission(struct ccs_request_info *r, | |
317 | + const struct ccs_path_info *filename); | |
318 | +static int ccs_find_next_domain(struct ccs_execve *ee); | |
319 | +static int ccs_get_path(const char *pathname, struct path *path); | |
320 | +static int ccs_kern_path(const char *pathname, int flags, struct path *path); | |
321 | +static int ccs_mkdev_perm(const u8 operation, struct dentry *dentry, | |
322 | + struct vfsmount *mnt, const unsigned int mode, | |
323 | + unsigned int dev); | |
324 | +static int ccs_mount_acl(struct ccs_request_info *r, const char *dev_name, | |
325 | + const struct path *dir, const char *type, | |
326 | + unsigned long flags); | |
327 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) | |
328 | +static int ccs_new_open_permission(struct file *filp); | |
329 | +#endif | |
330 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) | |
331 | +static int ccs_old_chroot_permission(struct nameidata *nd); | |
332 | +static int ccs_old_mount_permission(const char *dev_name, struct nameidata *nd, | |
333 | + const char *type, unsigned long flags, | |
334 | + void *data_page); | |
335 | +static int ccs_old_pivot_root_permission(struct nameidata *old_nd, | |
336 | + struct nameidata *new_nd); | |
337 | +#endif | |
338 | +static int ccs_path2_perm(const u8 operation, struct dentry *dentry1, | |
339 | + struct vfsmount *mnt1, struct dentry *dentry2, | |
340 | + struct vfsmount *mnt2); | |
341 | +static int ccs_path_number_perm(const u8 type, struct dentry *dentry, | |
342 | + struct vfsmount *vfsmnt, unsigned long number); | |
343 | +static int ccs_path_perm(const u8 operation, struct dentry *dentry, | |
344 | + struct vfsmount *mnt, const char *target); | |
345 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 21) || LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) || !defined(CONFIG_SYSCTL_SYSCALL) | |
346 | +static | |
347 | +#endif | |
348 | +int ccs_path_permission(struct ccs_request_info *r, u8 operation, | |
349 | + const struct ccs_path_info *filename); | |
350 | +static int ccs_symlink_path(const char *pathname, struct ccs_path_info *name); | |
351 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 32) | |
352 | +static void __ccs_clear_open_mode(void); | |
353 | +static void __ccs_save_open_mode(int mode); | |
354 | +#endif | |
355 | +static void ccs_add_slash(struct ccs_path_info *buf); | |
356 | + | |
357 | +#ifdef CONFIG_CCSECURITY_MISC | |
358 | +static bool ccs_check_env_acl(struct ccs_request_info *r, | |
359 | + const struct ccs_acl_info *ptr); | |
360 | +static int ccs_env_perm(struct ccs_request_info *r, const char *env); | |
361 | +static int ccs_environ(struct ccs_execve *ee); | |
362 | +#endif | |
363 | + | |
364 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
365 | +static bool __ccs_capable(const u8 operation); | |
366 | +static bool ccs_check_capability_acl(struct ccs_request_info *r, | |
367 | + const struct ccs_acl_info *ptr); | |
368 | +static bool ccs_kernel_service(void); | |
369 | +static int __ccs_ptrace_permission(long request, long pid); | |
370 | +static int __ccs_socket_create_permission(int family, int type, int protocol); | |
371 | +#endif | |
372 | + | |
373 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
374 | +static bool ccs_address_matches_group(const bool is_ipv6, const u32 *address, | |
375 | + const struct ccs_group *group); | |
376 | +static bool ccs_check_inet_acl(struct ccs_request_info *r, | |
377 | + const struct ccs_acl_info *ptr); | |
378 | +static bool ccs_check_unix_acl(struct ccs_request_info *r, | |
379 | + const struct ccs_acl_info *ptr); | |
380 | +static bool ccs_kernel_service(void); | |
381 | +static int __ccs_socket_bind_permission(struct socket *sock, | |
382 | + struct sockaddr *addr, int addr_len); | |
383 | +static int __ccs_socket_connect_permission(struct socket *sock, | |
384 | + struct sockaddr *addr, | |
385 | + int addr_len); | |
386 | +static int __ccs_socket_listen_permission(struct socket *sock); | |
387 | +static int __ccs_socket_post_accept_permission(struct socket *sock, | |
388 | + struct socket *newsock); | |
389 | +static int __ccs_socket_sendmsg_permission(struct socket *sock, | |
390 | + struct msghdr *msg, int size); | |
391 | +static int ccs_check_inet_address(const struct sockaddr *addr, | |
392 | + const unsigned int addr_len, const u16 port, | |
393 | + struct ccs_addr_info *address); | |
394 | +static int ccs_check_unix_address(struct sockaddr *addr, | |
395 | + const unsigned int addr_len, | |
396 | + struct ccs_addr_info *address); | |
397 | +static int ccs_inet_entry(const struct ccs_addr_info *address); | |
398 | +static int ccs_unix_entry(const struct ccs_addr_info *address); | |
399 | +static u8 ccs_sock_family(struct sock *sk); | |
400 | +#endif | |
401 | + | |
402 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
403 | +static int __ccs_socket_post_recvmsg_permission(struct sock *sk, | |
404 | + struct sk_buff *skb, | |
405 | + int flags); | |
406 | +#endif | |
407 | + | |
408 | +#ifdef CONFIG_CCSECURITY_IPC | |
409 | +static bool ccs_check_signal_acl(struct ccs_request_info *r, | |
410 | + const struct ccs_acl_info *ptr); | |
411 | +static int ccs_signal_acl(const int pid, const int sig); | |
412 | +static int ccs_signal_acl0(pid_t tgid, pid_t pid, int sig); | |
413 | +static int ccs_signal_acl2(const int sig, const int pid); | |
414 | +#endif | |
415 | + | |
416 | +#ifdef CONFIG_CCSECURITY_FILE_GETATTR | |
417 | +static int __ccs_getattr_permission(struct vfsmount *mnt, | |
418 | + struct dentry *dentry); | |
419 | +#endif | |
420 | + | |
421 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
422 | +static bool ccs_find_execute_handler(struct ccs_execve *ee, const u8 type); | |
423 | +static int ccs_try_alt_exec(struct ccs_execve *ee); | |
424 | +static void ccs_unescape(unsigned char *dest); | |
425 | +#endif | |
426 | + | |
427 | +#ifdef CONFIG_CCSECURITY_TASK_DOMAIN_TRANSITION | |
428 | +static bool ccs_check_task_acl(struct ccs_request_info *r, | |
429 | + const struct ccs_acl_info *ptr); | |
430 | +#endif | |
431 | + | |
432 | +/***** SECTION4: Standalone functions section *****/ | |
433 | + | |
434 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) | |
435 | + | |
436 | +/** | |
437 | + * ccs_copy_argv - Wrapper for copy_strings_kernel(). | |
438 | + * | |
439 | + * @arg: String to copy. | |
440 | + * @bprm: Pointer to "struct linux_binprm". | |
441 | + * | |
442 | + * Returns return value of copy_strings_kernel(). | |
443 | + */ | |
444 | +static inline int ccs_copy_argv(const char *arg, struct linux_binprm *bprm) | |
445 | +{ | |
446 | + const int ret = copy_strings_kernel(1, &arg, bprm); | |
447 | + if (ret >= 0) | |
448 | + bprm->argc++; | |
449 | + return ret; | |
450 | +} | |
451 | + | |
452 | +#else | |
453 | + | |
454 | +/** | |
455 | + * ccs_copy_argv - Wrapper for copy_strings_kernel(). | |
456 | + * | |
457 | + * @arg: String to copy. | |
458 | + * @bprm: Pointer to "struct linux_binprm". | |
459 | + * | |
460 | + * Returns return value of copy_strings_kernel(). | |
461 | + */ | |
462 | +static inline int ccs_copy_argv(char *arg, struct linux_binprm *bprm) | |
463 | +{ | |
464 | + const int ret = copy_strings_kernel(1, &arg, bprm); | |
465 | + if (ret >= 0) | |
466 | + bprm->argc++; | |
467 | + return ret; | |
468 | +} | |
469 | + | |
470 | +#endif | |
471 | + | |
472 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 35) | |
473 | + | |
474 | +/** | |
475 | + * get_fs_root - Get reference on root directory. | |
476 | + * | |
477 | + * @fs: Pointer to "struct fs_struct". | |
478 | + * @root: Pointer to "struct path". | |
479 | + * | |
480 | + * Returns nothing. | |
481 | + * | |
482 | + * This is for compatibility with older kernels. | |
483 | + */ | |
484 | +static inline void get_fs_root(struct fs_struct *fs, struct path *root) | |
485 | +{ | |
486 | + read_lock(&fs->lock); | |
487 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) | |
488 | + *root = fs->root; | |
489 | + path_get(root); | |
490 | +#else | |
491 | + root->dentry = dget(fs->root); | |
492 | + root->mnt = mntget(fs->rootmnt); | |
493 | +#endif | |
494 | + read_unlock(&fs->lock); | |
495 | +} | |
496 | + | |
497 | +#endif | |
498 | + | |
499 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) | |
500 | + | |
501 | +/** | |
502 | + * module_put - Put a reference on module. | |
503 | + * | |
504 | + * @module: Pointer to "struct module". Maybe NULL. | |
505 | + * | |
506 | + * Returns nothing. | |
507 | + * | |
508 | + * This is for compatibility with older kernels. | |
509 | + */ | |
510 | +static inline void module_put(struct module *module) | |
511 | +{ | |
512 | + if (module) | |
513 | + __MOD_DEC_USE_COUNT(module); | |
514 | +} | |
515 | + | |
516 | +#endif | |
517 | + | |
518 | +/** | |
519 | + * ccs_put_filesystem - Wrapper for put_filesystem(). | |
520 | + * | |
521 | + * @fstype: Pointer to "struct file_system_type". | |
522 | + * | |
523 | + * Returns nothing. | |
524 | + * | |
525 | + * Since put_filesystem() is not exported, I embed put_filesystem() here. | |
526 | + */ | |
527 | +static inline void ccs_put_filesystem(struct file_system_type *fstype) | |
528 | +{ | |
529 | + module_put(fstype->owner); | |
530 | +} | |
531 | + | |
532 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
533 | + | |
534 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) | |
535 | +#if !defined(RHEL_MAJOR) || RHEL_MAJOR != 5 | |
536 | +#if !defined(AX_MAJOR) || AX_MAJOR != 3 | |
537 | + | |
538 | +/** | |
539 | + * ip_hdr - Get "struct iphdr". | |
540 | + * | |
541 | + * @skb: Pointer to "struct sk_buff". | |
542 | + * | |
543 | + * Returns pointer to "struct iphdr". | |
544 | + * | |
545 | + * This is for compatibility with older kernels. | |
546 | + */ | |
547 | +static inline struct iphdr *ip_hdr(const struct sk_buff *skb) | |
548 | +{ | |
549 | + return skb->nh.iph; | |
550 | +} | |
551 | + | |
552 | +/** | |
553 | + * udp_hdr - Get "struct udphdr". | |
554 | + * | |
555 | + * @skb: Pointer to "struct sk_buff". | |
556 | + * | |
557 | + * Returns pointer to "struct udphdr". | |
558 | + * | |
559 | + * This is for compatibility with older kernels. | |
560 | + */ | |
561 | +static inline struct udphdr *udp_hdr(const struct sk_buff *skb) | |
562 | +{ | |
563 | + return skb->h.uh; | |
564 | +} | |
565 | + | |
566 | +/** | |
567 | + * ipv6_hdr - Get "struct ipv6hdr". | |
568 | + * | |
569 | + * @skb: Pointer to "struct sk_buff". | |
570 | + * | |
571 | + * Returns pointer to "struct ipv6hdr". | |
572 | + * | |
573 | + * This is for compatibility with older kernels. | |
574 | + */ | |
575 | +static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) | |
576 | +{ | |
577 | + return skb->nh.ipv6h; | |
578 | +} | |
579 | + | |
580 | +#endif | |
581 | +#endif | |
582 | +#endif | |
583 | + | |
584 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0) | |
585 | + | |
586 | +/** | |
587 | + * skb_kill_datagram - Kill a datagram forcibly. | |
588 | + * | |
589 | + * @sk: Pointer to "struct sock". | |
590 | + * @skb: Pointer to "struct sk_buff". | |
591 | + * @flags: Flags passed to skb_recv_datagram(). | |
592 | + * | |
593 | + * Returns nothing. | |
594 | + */ | |
595 | +static inline void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, | |
596 | + int flags) | |
597 | +{ | |
598 | + /* Clear queue. */ | |
599 | + if (flags & MSG_PEEK) { | |
600 | + int clear = 0; | |
601 | + spin_lock_irq(&sk->receive_queue.lock); | |
602 | + if (skb == skb_peek(&sk->receive_queue)) { | |
603 | + __skb_unlink(skb, &sk->receive_queue); | |
604 | + clear = 1; | |
605 | + } | |
606 | + spin_unlock_irq(&sk->receive_queue.lock); | |
607 | + if (clear) | |
608 | + kfree_skb(skb); | |
609 | + } | |
610 | + skb_free_datagram(sk, skb); | |
611 | +} | |
612 | + | |
613 | +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16) | |
614 | + | |
615 | +/** | |
616 | + * skb_kill_datagram - Kill a datagram forcibly. | |
617 | + * | |
618 | + * @sk: Pointer to "struct sock". | |
619 | + * @skb: Pointer to "struct sk_buff". | |
620 | + * @flags: Flags passed to skb_recv_datagram(). | |
621 | + * | |
622 | + * Returns nothing. | |
623 | + */ | |
624 | +static inline void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, | |
625 | + int flags) | |
626 | +{ | |
627 | + /* Clear queue. */ | |
628 | + if (flags & MSG_PEEK) { | |
629 | + int clear = 0; | |
630 | + spin_lock_bh(&sk->sk_receive_queue.lock); | |
631 | + if (skb == skb_peek(&sk->sk_receive_queue)) { | |
632 | + __skb_unlink(skb, &sk->sk_receive_queue); | |
633 | + clear = 1; | |
634 | + } | |
635 | + spin_unlock_bh(&sk->sk_receive_queue.lock); | |
636 | + if (clear) | |
637 | + kfree_skb(skb); | |
638 | + } | |
639 | + skb_free_datagram(sk, skb); | |
640 | +} | |
641 | + | |
642 | +#endif | |
643 | + | |
644 | +#endif | |
645 | + | |
646 | +/***** SECTION5: Variables definition section *****/ | |
647 | + | |
648 | +/* The initial domain. */ | |
649 | +struct ccs_domain_info ccs_kernel_domain; | |
650 | + | |
651 | +/* The list for "struct ccs_domain_info". */ | |
652 | +LIST_HEAD(ccs_domain_list); | |
653 | + | |
654 | +/***** SECTION6: Dependent functions section *****/ | |
655 | + | |
656 | +/** | |
657 | + * ccs_path_matches_group - Check whether the given pathname matches members of the given pathname group. | |
658 | + * | |
659 | + * @pathname: The name of pathname. | |
660 | + * @group: Pointer to "struct ccs_path_group". | |
661 | + * | |
662 | + * Returns matched member's pathname if @pathname matches pathnames in @group, | |
663 | + * NULL otherwise. | |
664 | + * | |
665 | + * Caller holds ccs_read_lock(). | |
666 | + */ | |
667 | +static const struct ccs_path_info *ccs_path_matches_group | |
668 | +(const struct ccs_path_info *pathname, const struct ccs_group *group) | |
669 | +{ | |
670 | + struct ccs_path_group *member; | |
671 | + list_for_each_entry_srcu(member, &group->member_list, head.list, | |
672 | + &ccs_ss) { | |
673 | + if (member->head.is_deleted) | |
674 | + continue; | |
675 | + if (!ccs_path_matches_pattern(pathname, member->member_name)) | |
676 | + continue; | |
677 | + return member->member_name; | |
678 | + } | |
679 | + return NULL; | |
680 | +} | |
681 | + | |
682 | +/** | |
683 | + * ccs_number_matches_group - Check whether the given number matches members of the given number group. | |
684 | + * | |
685 | + * @min: Min number. | |
686 | + * @max: Max number. | |
687 | + * @group: Pointer to "struct ccs_number_group". | |
688 | + * | |
689 | + * Returns true if @min and @max partially overlaps @group, false otherwise. | |
690 | + * | |
691 | + * Caller holds ccs_read_lock(). | |
692 | + */ | |
693 | +static bool ccs_number_matches_group(const unsigned long min, | |
694 | + const unsigned long max, | |
695 | + const struct ccs_group *group) | |
696 | +{ | |
697 | + struct ccs_number_group *member; | |
698 | + bool matched = false; | |
699 | + list_for_each_entry_srcu(member, &group->member_list, head.list, | |
700 | + &ccs_ss) { | |
701 | + if (member->head.is_deleted) | |
702 | + continue; | |
703 | + if (min > member->number.values[1] || | |
704 | + max < member->number.values[0]) | |
705 | + continue; | |
706 | + matched = true; | |
707 | + break; | |
708 | + } | |
709 | + return matched; | |
710 | +} | |
711 | + | |
712 | +/** | |
713 | + * ccs_check_entry - Do permission check. | |
714 | + * | |
715 | + * @r: Pointer to "struct ccs_request_info". | |
716 | + * @ptr: Pointer to "struct ccs_acl_info". | |
717 | + * | |
718 | + * Returns true on match, false otherwise. | |
719 | + * | |
720 | + * Caller holds ccs_read_lock(). | |
721 | + */ | |
722 | +static bool ccs_check_entry(struct ccs_request_info *r, | |
723 | + struct ccs_acl_info *ptr) | |
724 | +{ | |
725 | + if (ptr->is_deleted || ptr->type != r->param_type) | |
726 | + return false; | |
727 | + switch (r->param_type) { | |
728 | + case CCS_TYPE_PATH_ACL: | |
729 | + return ccs_check_path_acl(r, ptr); | |
730 | + case CCS_TYPE_PATH2_ACL: | |
731 | + return ccs_check_path2_acl(r, ptr); | |
732 | + case CCS_TYPE_PATH_NUMBER_ACL: | |
733 | + return ccs_check_path_number_acl(r, ptr); | |
734 | + case CCS_TYPE_MKDEV_ACL: | |
735 | + return ccs_check_mkdev_acl(r, ptr); | |
736 | + case CCS_TYPE_MOUNT_ACL: | |
737 | + return ccs_check_mount_acl(r, ptr); | |
738 | +#ifdef CONFIG_CCSECURITY_MISC | |
739 | + case CCS_TYPE_ENV_ACL: | |
740 | + return ccs_check_env_acl(r, ptr); | |
741 | +#endif | |
742 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
743 | + case CCS_TYPE_CAPABILITY_ACL: | |
744 | + return ccs_check_capability_acl(r, ptr); | |
745 | +#endif | |
746 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
747 | + case CCS_TYPE_INET_ACL: | |
748 | + return ccs_check_inet_acl(r, ptr); | |
749 | + case CCS_TYPE_UNIX_ACL: | |
750 | + return ccs_check_unix_acl(r, ptr); | |
751 | +#endif | |
752 | +#ifdef CONFIG_CCSECURITY_IPC | |
753 | + case CCS_TYPE_SIGNAL_ACL: | |
754 | + return ccs_check_signal_acl(r, ptr); | |
755 | +#endif | |
756 | +#ifdef CONFIG_CCSECURITY_TASK_DOMAIN_TRANSITION | |
757 | + case CCS_TYPE_MANUAL_TASK_ACL: | |
758 | + return ccs_check_task_acl(r, ptr); | |
759 | +#endif | |
760 | + } | |
761 | + return true; | |
762 | +} | |
763 | + | |
764 | +/** | |
765 | + * ccs_check_acl - Do permission check. | |
766 | + * | |
767 | + * @r: Pointer to "struct ccs_request_info". | |
768 | + * | |
769 | + * Returns 0 on success, negative value otherwise. | |
770 | + * | |
771 | + * Caller holds ccs_read_lock(). | |
772 | + */ | |
773 | +int ccs_check_acl(struct ccs_request_info *r) | |
774 | +{ | |
775 | + const struct ccs_domain_info *domain = ccs_current_domain(); | |
776 | + int error; | |
777 | + do { | |
778 | + struct ccs_acl_info *ptr; | |
779 | + const struct list_head *list = &domain->acl_info_list; | |
780 | + u16 i = 0; | |
781 | +retry: | |
782 | + list_for_each_entry_srcu(ptr, list, list, &ccs_ss) { | |
783 | + if (!ccs_check_entry(r, ptr)) | |
784 | + continue; | |
785 | + if (!ccs_condition(r, ptr->cond)) | |
786 | + continue; | |
787 | + r->matched_acl = ptr; | |
788 | + r->granted = true; | |
789 | + ccs_audit_log(r); | |
790 | + return 0; | |
791 | + } | |
792 | + for (; i < CCS_MAX_ACL_GROUPS; i++) { | |
793 | + if (!test_bit(i, domain->group)) | |
794 | + continue; | |
795 | + list = &domain->ns->acl_group[i++]; | |
796 | + goto retry; | |
797 | + } | |
798 | + r->granted = false; | |
799 | + error = ccs_audit_log(r); | |
800 | + } while (error == CCS_RETRY_REQUEST && | |
801 | + r->type != CCS_MAC_FILE_EXECUTE); | |
802 | + return error; | |
803 | +} | |
804 | + | |
805 | +/** | |
806 | + * ccs_last_word - Get last component of a domainname. | |
807 | + * | |
808 | + * @name: Domainname to check. | |
809 | + * | |
810 | + * Returns the last word of @name. | |
811 | + */ | |
812 | +static const char *ccs_last_word(const char *name) | |
813 | +{ | |
814 | + const char *cp = strrchr(name, ' '); | |
815 | + if (cp) | |
816 | + return cp + 1; | |
817 | + return name; | |
818 | +} | |
819 | + | |
820 | +/** | |
821 | + * ccs_scan_transition - Try to find specific domain transition type. | |
822 | + * | |
823 | + * @list: Pointer to "struct list_head". | |
824 | + * @domainname: The name of current domain. | |
825 | + * @program: The name of requested program. | |
826 | + * @last_name: The last component of @domainname. | |
827 | + * @type: One of values in "enum ccs_transition_type". | |
828 | + * | |
829 | + * Returns true if found one, false otherwise. | |
830 | + * | |
831 | + * Caller holds ccs_read_lock(). | |
832 | + */ | |
833 | +static bool ccs_scan_transition(const struct list_head *list, | |
834 | + const struct ccs_path_info *domainname, | |
835 | + const struct ccs_path_info *program, | |
836 | + const char *last_name, | |
837 | + const enum ccs_transition_type type) | |
838 | +{ | |
839 | + const struct ccs_transition_control *ptr; | |
840 | + list_for_each_entry_srcu(ptr, list, head.list, &ccs_ss) { | |
841 | + if (ptr->head.is_deleted || ptr->type != type) | |
842 | + continue; | |
843 | + if (ptr->domainname) { | |
844 | + if (!ptr->is_last_name) { | |
845 | + if (ptr->domainname != domainname) | |
846 | + continue; | |
847 | + } else { | |
848 | + /* | |
849 | + * Use direct strcmp() since this is | |
850 | + * unlikely used. | |
851 | + */ | |
852 | + if (strcmp(ptr->domainname->name, last_name)) | |
853 | + continue; | |
854 | + } | |
855 | + } | |
856 | + if (ptr->program && ccs_pathcmp(ptr->program, program)) | |
857 | + continue; | |
858 | + return true; | |
859 | + } | |
860 | + return false; | |
861 | +} | |
862 | + | |
863 | +/** | |
864 | + * ccs_transition_type - Get domain transition type. | |
865 | + * | |
866 | + * @ns: Pointer to "struct ccs_policy_namespace". | |
867 | + * @domainname: The name of current domain. | |
868 | + * @program: The name of requested program. | |
869 | + * | |
870 | + * Returns CCS_TRANSITION_CONTROL_TRANSIT if executing @program causes domain | |
871 | + * transition across namespaces, CCS_TRANSITION_CONTROL_INITIALIZE if executing | |
872 | + * @program reinitializes domain transition within that namespace, | |
873 | + * CCS_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname , | |
874 | + * others otherwise. | |
875 | + * | |
876 | + * Caller holds ccs_read_lock(). | |
877 | + */ | |
878 | +static enum ccs_transition_type ccs_transition_type | |
879 | +(const struct ccs_policy_namespace *ns, const struct ccs_path_info *domainname, | |
880 | + const struct ccs_path_info *program) | |
881 | +{ | |
882 | + const char *last_name = ccs_last_word(domainname->name); | |
883 | + enum ccs_transition_type type = CCS_TRANSITION_CONTROL_NO_RESET; | |
884 | + while (type < CCS_MAX_TRANSITION_TYPE) { | |
885 | + const struct list_head * const list = | |
886 | + &ns->policy_list[CCS_ID_TRANSITION_CONTROL]; | |
887 | + if (!ccs_scan_transition(list, domainname, program, last_name, | |
888 | + type)) { | |
889 | + type++; | |
890 | + continue; | |
891 | + } | |
892 | + if (type != CCS_TRANSITION_CONTROL_NO_RESET && | |
893 | + type != CCS_TRANSITION_CONTROL_NO_INITIALIZE) | |
894 | + break; | |
895 | + /* | |
896 | + * Do not check for reset_domain if no_reset_domain matched. | |
897 | + * Do not check for initialize_domain if no_initialize_domain | |
898 | + * matched. | |
899 | + */ | |
900 | + type++; | |
901 | + type++; | |
902 | + } | |
903 | + return type; | |
904 | +} | |
905 | + | |
906 | +/** | |
907 | + * ccs_find_next_domain - Find a domain. | |
908 | + * | |
909 | + * @ee: Pointer to "struct ccs_execve". | |
910 | + * | |
911 | + * Returns 0 on success, negative value otherwise. | |
912 | + * | |
913 | + * Caller holds ccs_read_lock(). | |
914 | + */ | |
915 | +static int ccs_find_next_domain(struct ccs_execve *ee) | |
916 | +{ | |
917 | + struct ccs_request_info *r = &ee->r; | |
918 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
919 | + const struct ccs_path_info *handler = ee->handler; | |
920 | +#endif | |
921 | + struct ccs_domain_info *domain = NULL; | |
922 | + struct ccs_domain_info * const old_domain = ccs_current_domain(); | |
923 | + struct linux_binprm *bprm = ee->bprm; | |
924 | + struct ccs_security *task = ccs_current_security(); | |
925 | + const struct ccs_path_info *candidate; | |
926 | + struct ccs_path_info exename; | |
927 | + int retval; | |
928 | + bool reject_on_transition_failure = false; | |
929 | + | |
930 | + /* Get symlink's pathname of program. */ | |
931 | + retval = ccs_symlink_path(bprm->filename, &exename); | |
932 | + if (retval < 0) | |
933 | + return retval; | |
934 | + | |
935 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
936 | + if (handler) { | |
937 | + /* No permission check for execute handler. */ | |
938 | + candidate = &exename; | |
939 | + if (ccs_pathcmp(candidate, handler)) { | |
940 | + /* Failed to verify execute handler. */ | |
941 | + static u8 counter = 20; | |
942 | + if (counter) { | |
943 | + counter--; | |
944 | + printk(KERN_WARNING "Failed to verify: %s\n", | |
945 | + handler->name); | |
946 | + } | |
947 | + goto out; | |
948 | + } | |
949 | + } else | |
950 | +#endif | |
951 | + { | |
952 | + struct ccs_aggregator *ptr; | |
953 | + struct list_head *list; | |
954 | +retry: | |
955 | + /* Check 'aggregator' directive. */ | |
956 | + candidate = &exename; | |
957 | + list = &old_domain->ns->policy_list[CCS_ID_AGGREGATOR]; | |
958 | + list_for_each_entry_srcu(ptr, list, head.list, &ccs_ss) { | |
959 | + if (ptr->head.is_deleted || | |
960 | + !ccs_path_matches_pattern(candidate, | |
961 | + ptr->original_name)) | |
962 | + continue; | |
963 | + candidate = ptr->aggregated_name; | |
964 | + break; | |
965 | + } | |
966 | + | |
967 | + /* Check execute permission. */ | |
968 | + retval = ccs_execute_permission(r, candidate); | |
969 | + if (retval == CCS_RETRY_REQUEST) | |
970 | + goto retry; | |
971 | + if (retval < 0) | |
972 | + goto out; | |
973 | + /* | |
974 | + * To be able to specify domainnames with wildcards, use the | |
975 | + * pathname specified in the policy (which may contain | |
976 | + * wildcard) rather than the pathname passed to execve() | |
977 | + * (which never contains wildcard). | |
978 | + */ | |
979 | + if (r->param.path.matched_path) | |
980 | + candidate = r->param.path.matched_path; | |
981 | + } | |
982 | + /* | |
983 | + * Check for domain transition preference if "file execute" matched. | |
984 | + * If preference is given, make do_execve() fail if domain transition | |
985 | + * has failed, for domain transition preference should be used with | |
986 | + * destination domain defined. | |
987 | + */ | |
988 | + if (r->ee->transition) { | |
989 | + const char *domainname = r->ee->transition->name; | |
990 | + reject_on_transition_failure = true; | |
991 | + if (!strcmp(domainname, "keep")) | |
992 | + goto force_keep_domain; | |
993 | + if (!strcmp(domainname, "child")) | |
994 | + goto force_child_domain; | |
995 | + if (!strcmp(domainname, "reset")) | |
996 | + goto force_reset_domain; | |
997 | + if (!strcmp(domainname, "initialize")) | |
998 | + goto force_initialize_domain; | |
999 | + if (!strcmp(domainname, "parent")) { | |
1000 | + char *cp; | |
1001 | + strncpy(ee->tmp, old_domain->domainname->name, | |
1002 | + CCS_EXEC_TMPSIZE - 1); | |
1003 | + cp = strrchr(ee->tmp, ' '); | |
1004 | + if (cp) | |
1005 | + *cp = '\0'; | |
1006 | + } else if (*domainname == '<') | |
1007 | + strncpy(ee->tmp, domainname, CCS_EXEC_TMPSIZE - 1); | |
1008 | + else | |
1009 | + snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", | |
1010 | + old_domain->domainname->name, domainname); | |
1011 | + goto force_jump_domain; | |
1012 | + } | |
1013 | + /* | |
1014 | + * No domain transition preference specified. | |
1015 | + * Calculate domain to transit to. | |
1016 | + */ | |
1017 | + switch (ccs_transition_type(old_domain->ns, old_domain->domainname, | |
1018 | + candidate)) { | |
1019 | + case CCS_TRANSITION_CONTROL_RESET: | |
1020 | +force_reset_domain: | |
1021 | + /* Transit to the root of specified namespace. */ | |
1022 | + snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "<%s>", | |
1023 | + candidate->name); | |
1024 | + /* | |
1025 | + * Make do_execve() fail if domain transition across namespaces | |
1026 | + * has failed. | |
1027 | + */ | |
1028 | + reject_on_transition_failure = true; | |
1029 | + break; | |
1030 | + case CCS_TRANSITION_CONTROL_INITIALIZE: | |
1031 | +force_initialize_domain: | |
1032 | + /* Transit to the child of current namespace's root. */ | |
1033 | + snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", | |
1034 | + old_domain->ns->name, candidate->name); | |
1035 | + break; | |
1036 | + case CCS_TRANSITION_CONTROL_KEEP: | |
1037 | +force_keep_domain: | |
1038 | + /* Keep current domain. */ | |
1039 | + domain = old_domain; | |
1040 | + break; | |
1041 | + default: | |
1042 | + if (old_domain == &ccs_kernel_domain && !ccs_policy_loaded) { | |
1043 | + /* | |
1044 | + * Needn't to transit from kernel domain before | |
1045 | + * starting /sbin/init. But transit from kernel domain | |
1046 | + * if executing initializers because they might start | |
1047 | + * before /sbin/init. | |
1048 | + */ | |
1049 | + domain = old_domain; | |
1050 | + break; | |
1051 | + } | |
1052 | +force_child_domain: | |
1053 | + /* Normal domain transition. */ | |
1054 | + snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s %s", | |
1055 | + old_domain->domainname->name, candidate->name); | |
1056 | + break; | |
1057 | + } | |
1058 | +force_jump_domain: | |
1059 | + /* | |
1060 | + * Tell GC that I started execve(). | |
1061 | + * Also, tell open_exec() to check read permission. | |
1062 | + */ | |
1063 | + task->ccs_flags |= CCS_TASK_IS_IN_EXECVE; | |
1064 | + /* | |
1065 | + * Make task->ccs_flags visible to GC before changing | |
1066 | + * task->ccs_domain_info. | |
1067 | + */ | |
1068 | + smp_wmb(); | |
1069 | + /* | |
1070 | + * Proceed to the next domain in order to allow reaching via PID. | |
1071 | + * It will be reverted if execve() failed. Reverting is not good. | |
1072 | + * But it is better than being unable to reach via PID in interactive | |
1073 | + * enforcing mode. | |
1074 | + */ | |
1075 | + if (!domain) | |
1076 | + domain = ccs_assign_domain(ee->tmp, true); | |
1077 | + if (domain) | |
1078 | + retval = 0; | |
1079 | + else if (reject_on_transition_failure) { | |
1080 | + printk(KERN_WARNING | |
1081 | + "ERROR: Domain '%s' not ready.\n", ee->tmp); | |
1082 | + retval = -ENOMEM; | |
1083 | + } else if (r->mode == CCS_CONFIG_ENFORCING) | |
1084 | + retval = -ENOMEM; | |
1085 | + else { | |
1086 | + retval = 0; | |
1087 | + if (!old_domain->flags[CCS_DIF_TRANSITION_FAILED]) { | |
1088 | + old_domain->flags[CCS_DIF_TRANSITION_FAILED] = true; | |
1089 | + r->granted = false; | |
1090 | + ccs_write_log(r, "%s", | |
1091 | + ccs_dif[CCS_DIF_TRANSITION_FAILED]); | |
1092 | + printk(KERN_WARNING | |
1093 | + "ERROR: Domain '%s' not defined.\n", ee->tmp); | |
1094 | + } | |
1095 | + } | |
1096 | +out: | |
1097 | + kfree(exename.name); | |
1098 | + return retval; | |
1099 | +} | |
1100 | + | |
1101 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
1102 | + | |
1103 | +/** | |
1104 | + * ccs_unescape - Unescape escaped string. | |
1105 | + * | |
1106 | + * @dest: String to unescape. | |
1107 | + * | |
1108 | + * Returns nothing. | |
1109 | + */ | |
1110 | +static void ccs_unescape(unsigned char *dest) | |
1111 | +{ | |
1112 | + unsigned char *src = dest; | |
1113 | + unsigned char c; | |
1114 | + unsigned char d; | |
1115 | + unsigned char e; | |
1116 | + while (1) { | |
1117 | + c = *src++; | |
1118 | + if (!c) | |
1119 | + break; | |
1120 | + if (c != '\\') { | |
1121 | + *dest++ = c; | |
1122 | + continue; | |
1123 | + } | |
1124 | + c = *src++; | |
1125 | + if (c == '\\') { | |
1126 | + *dest++ = c; | |
1127 | + continue; | |
1128 | + } | |
1129 | + if (c < '0' || c > '3') | |
1130 | + break; | |
1131 | + d = *src++; | |
1132 | + if (d < '0' || d > '7') | |
1133 | + break; | |
1134 | + e = *src++; | |
1135 | + if (e < '0' || e > '7') | |
1136 | + break; | |
1137 | + *dest++ = ((c - '0') << 6) + ((d - '0') << 3) + (e - '0'); | |
1138 | + } | |
1139 | + *dest = '\0'; | |
1140 | +} | |
1141 | + | |
1142 | +/** | |
1143 | + * ccs_try_alt_exec - Try to start execute handler. | |
1144 | + * | |
1145 | + * @ee: Pointer to "struct ccs_execve". | |
1146 | + * | |
1147 | + * Returns 0 on success, negative value otherwise. | |
1148 | + */ | |
1149 | +static int ccs_try_alt_exec(struct ccs_execve *ee) | |
1150 | +{ | |
1151 | + /* | |
1152 | + * Contents of modified bprm. | |
1153 | + * The envp[] in original bprm is moved to argv[] so that | |
1154 | + * the alternatively executed program won't be affected by | |
1155 | + * some dangerous environment variables like LD_PRELOAD. | |
1156 | + * | |
1157 | + * modified bprm->argc | |
1158 | + * = original bprm->argc + original bprm->envc + 7 | |
1159 | + * modified bprm->envc | |
1160 | + * = 0 | |
1161 | + * | |
1162 | + * modified bprm->argv[0] | |
1163 | + * = the program's name specified by *_execute_handler | |
1164 | + * modified bprm->argv[1] | |
1165 | + * = ccs_current_domain()->domainname->name | |
1166 | + * modified bprm->argv[2] | |
1167 | + * = the current process's name | |
1168 | + * modified bprm->argv[3] | |
1169 | + * = the current process's information (e.g. uid/gid). | |
1170 | + * modified bprm->argv[4] | |
1171 | + * = original bprm->filename | |
1172 | + * modified bprm->argv[5] | |
1173 | + * = original bprm->argc in string expression | |
1174 | + * modified bprm->argv[6] | |
1175 | + * = original bprm->envc in string expression | |
1176 | + * modified bprm->argv[7] | |
1177 | + * = original bprm->argv[0] | |
1178 | + * ... | |
1179 | + * modified bprm->argv[bprm->argc + 6] | |
1180 | + * = original bprm->argv[bprm->argc - 1] | |
1181 | + * modified bprm->argv[bprm->argc + 7] | |
1182 | + * = original bprm->envp[0] | |
1183 | + * ... | |
1184 | + * modified bprm->argv[bprm->envc + bprm->argc + 6] | |
1185 | + * = original bprm->envp[bprm->envc - 1] | |
1186 | + */ | |
1187 | + struct linux_binprm *bprm = ee->bprm; | |
1188 | + struct file *filp; | |
1189 | + int retval; | |
1190 | + const int original_argc = bprm->argc; | |
1191 | + const int original_envc = bprm->envc; | |
1192 | + | |
1193 | + /* Close the requested program's dentry. */ | |
1194 | + ee->obj.path1.dentry = NULL; | |
1195 | + ee->obj.path1.mnt = NULL; | |
1196 | + ee->obj.stat_valid[CCS_PATH1] = false; | |
1197 | + ee->obj.stat_valid[CCS_PATH1_PARENT] = false; | |
1198 | + ee->obj.validate_done = false; | |
1199 | + allow_write_access(bprm->file); | |
1200 | + fput(bprm->file); | |
1201 | + bprm->file = NULL; | |
1202 | + | |
1203 | + /* Invalidate page dump cache. */ | |
1204 | + ee->dump.page = NULL; | |
1205 | + | |
1206 | + /* Move envp[] to argv[] */ | |
1207 | + bprm->argc += bprm->envc; | |
1208 | + bprm->envc = 0; | |
1209 | + | |
1210 | + /* Set argv[6] */ | |
1211 | + { | |
1212 | + snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_envc); | |
1213 | + retval = ccs_copy_argv(ee->tmp, bprm); | |
1214 | + if (retval < 0) | |
1215 | + goto out; | |
1216 | + } | |
1217 | + | |
1218 | + /* Set argv[5] */ | |
1219 | + { | |
1220 | + snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%d", original_argc); | |
1221 | + retval = ccs_copy_argv(ee->tmp, bprm); | |
1222 | + if (retval < 0) | |
1223 | + goto out; | |
1224 | + } | |
1225 | + | |
1226 | + /* Set argv[4] */ | |
1227 | + { | |
1228 | + retval = ccs_copy_argv(bprm->filename, bprm); | |
1229 | + if (retval < 0) | |
1230 | + goto out; | |
1231 | + } | |
1232 | + | |
1233 | + /* Set argv[3] */ | |
1234 | + { | |
1235 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
1236 | + /* | |
1237 | + * Pass uid/gid seen from current user namespace, for these | |
1238 | + * values are used by programs in current user namespace in | |
1239 | + * order to decide whether to execve() or not (rather than by | |
1240 | + * auditing daemon in init's user namespace). | |
1241 | + */ | |
1242 | + snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, | |
1243 | + "pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " | |
1244 | + "sgid=%d fsuid=%d fsgid=%d", ccs_sys_getpid(), | |
1245 | + __kuid_val(current_uid()), __kgid_val(current_gid()), | |
1246 | + __kuid_val(current_euid()), | |
1247 | + __kgid_val(current_egid()), | |
1248 | + __kuid_val(current_suid()), | |
1249 | + __kgid_val(current_sgid()), | |
1250 | + __kuid_val(current_fsuid()), | |
1251 | + __kgid_val(current_fsgid())); | |
1252 | +#else | |
1253 | + snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, | |
1254 | + "pid=%d uid=%d gid=%d euid=%d egid=%d suid=%d " | |
1255 | + "sgid=%d fsuid=%d fsgid=%d", ccs_sys_getpid(), | |
1256 | + current_uid(), current_gid(), current_euid(), | |
1257 | + current_egid(), current_suid(), current_sgid(), | |
1258 | + current_fsuid(), current_fsgid()); | |
1259 | +#endif | |
1260 | + retval = ccs_copy_argv(ee->tmp, bprm); | |
1261 | + if (retval < 0) | |
1262 | + goto out; | |
1263 | + } | |
1264 | + | |
1265 | + /* Set argv[2] */ | |
1266 | + { | |
1267 | + char *exe = (char *) ccs_get_exe(); | |
1268 | + if (exe) { | |
1269 | + retval = ccs_copy_argv(exe, bprm); | |
1270 | + kfree(exe); | |
1271 | + } else { | |
1272 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) | |
1273 | + retval = ccs_copy_argv("<unknown>", bprm); | |
1274 | +#else | |
1275 | + snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "<unknown>"); | |
1276 | + retval = ccs_copy_argv(ee->tmp, bprm); | |
1277 | +#endif | |
1278 | + } | |
1279 | + if (retval < 0) | |
1280 | + goto out; | |
1281 | + } | |
1282 | + | |
1283 | + /* Set argv[1] */ | |
1284 | + { | |
1285 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36) | |
1286 | + retval = ccs_copy_argv(ccs_current_domain()->domainname->name, | |
1287 | + bprm); | |
1288 | +#else | |
1289 | + snprintf(ee->tmp, CCS_EXEC_TMPSIZE - 1, "%s", | |
1290 | + ccs_current_domain()->domainname->name); | |
1291 | + retval = ccs_copy_argv(ee->tmp, bprm); | |
1292 | +#endif | |
1293 | + if (retval < 0) | |
1294 | + goto out; | |
1295 | + } | |
1296 | + | |
1297 | + /* Set argv[0] */ | |
1298 | + { | |
1299 | + struct path root; | |
1300 | + char *cp; | |
1301 | + int root_len; | |
1302 | + int handler_len; | |
1303 | + get_fs_root(current->fs, &root); | |
1304 | + cp = ccs_realpath(&root); | |
1305 | + path_put(&root); | |
1306 | + if (!cp) { | |
1307 | + retval = -ENOMEM; | |
1308 | + goto out; | |
1309 | + } | |
1310 | + root_len = strlen(cp); | |
1311 | + retval = strncmp(ee->handler->name, cp, root_len); | |
1312 | + root_len--; | |
1313 | + kfree(cp); | |
1314 | + if (retval) { | |
1315 | + retval = -ENOENT; | |
1316 | + goto out; | |
1317 | + } | |
1318 | + handler_len = ee->handler->total_len + 1; | |
1319 | + cp = kmalloc(handler_len, CCS_GFP_FLAGS); | |
1320 | + if (!cp) { | |
1321 | + retval = -ENOMEM; | |
1322 | + goto out; | |
1323 | + } | |
1324 | + /* ee->handler_path is released by ccs_finish_execve(). */ | |
1325 | + ee->handler_path = cp; | |
1326 | + /* Adjust root directory for open_exec(). */ | |
1327 | + memmove(cp, ee->handler->name + root_len, | |
1328 | + handler_len - root_len); | |
1329 | + ccs_unescape(cp); | |
1330 | + retval = -ENOENT; | |
1331 | + if (*cp != '/') | |
1332 | + goto out; | |
1333 | + retval = ccs_copy_argv(cp, bprm); | |
1334 | + if (retval < 0) | |
1335 | + goto out; | |
1336 | + } | |
1337 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) | |
1338 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) | |
1339 | + bprm->argv_len = bprm->exec - bprm->p; | |
1340 | +#endif | |
1341 | +#endif | |
1342 | + | |
1343 | + /* | |
1344 | + * OK, now restart the process with execute handler program's dentry. | |
1345 | + */ | |
1346 | + filp = open_exec(ee->handler_path); | |
1347 | + if (IS_ERR(filp)) { | |
1348 | + retval = PTR_ERR(filp); | |
1349 | + goto out; | |
1350 | + } | |
1351 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) | |
1352 | + ee->obj.path1 = filp->f_path; | |
1353 | +#else | |
1354 | + ee->obj.path1.dentry = filp->f_dentry; | |
1355 | + ee->obj.path1.mnt = filp->f_vfsmnt; | |
1356 | +#endif | |
1357 | + bprm->file = filp; | |
1358 | + bprm->filename = ee->handler_path; | |
1359 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) | |
1360 | + bprm->interp = bprm->filename; | |
1361 | +#endif | |
1362 | + retval = prepare_binprm(bprm); | |
1363 | + if (retval < 0) | |
1364 | + goto out; | |
1365 | + ee->r.dont_sleep_on_enforce_error = true; | |
1366 | + retval = ccs_find_next_domain(ee); | |
1367 | + ee->r.dont_sleep_on_enforce_error = false; | |
1368 | +out: | |
1369 | + return retval; | |
1370 | +} | |
1371 | + | |
1372 | +/** | |
1373 | + * ccs_find_execute_handler - Find an execute handler. | |
1374 | + * | |
1375 | + * @ee: Pointer to "struct ccs_execve". | |
1376 | + * @type: Type of execute handler. | |
1377 | + * | |
1378 | + * Returns true if found, false otherwise. | |
1379 | + * | |
1380 | + * Caller holds ccs_read_lock(). | |
1381 | + */ | |
1382 | +static bool ccs_find_execute_handler(struct ccs_execve *ee, const u8 type) | |
1383 | +{ | |
1384 | + struct ccs_request_info *r = &ee->r; | |
1385 | + /* | |
1386 | + * To avoid infinite execute handler loop, don't use execute handler | |
1387 | + * if the current process is marked as execute handler. | |
1388 | + */ | |
1389 | + if (ccs_current_flags() & CCS_TASK_IS_EXECUTE_HANDLER) | |
1390 | + return false; | |
1391 | + r->param_type = type; | |
1392 | + ccs_check_acl(r); | |
1393 | + if (!r->granted) | |
1394 | + return false; | |
1395 | + ee->handler = container_of(r->matched_acl, struct ccs_handler_acl, | |
1396 | + head)->handler; | |
1397 | + ee->transition = r->matched_acl && r->matched_acl->cond && | |
1398 | + r->matched_acl->cond->exec_transit ? | |
1399 | + r->matched_acl->cond->transit : NULL; | |
1400 | + return true; | |
1401 | +} | |
1402 | + | |
1403 | +#endif | |
1404 | + | |
1405 | +#ifdef CONFIG_MMU | |
1406 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23) | |
1407 | +#define CCS_BPRM_MMU | |
1408 | +#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 5 && defined(RHEL_MINOR) && RHEL_MINOR >= 3 | |
1409 | +#define CCS_BPRM_MMU | |
1410 | +#elif defined(AX_MAJOR) && AX_MAJOR == 3 && defined(AX_MINOR) && AX_MINOR >= 2 | |
1411 | +#define CCS_BPRM_MMU | |
1412 | +#endif | |
1413 | +#endif | |
1414 | + | |
1415 | +/** | |
1416 | + * ccs_dump_page - Dump a page to buffer. | |
1417 | + * | |
1418 | + * @bprm: Pointer to "struct linux_binprm". | |
1419 | + * @pos: Location to dump. | |
1420 | + * @dump: Poiner to "struct ccs_page_dump". | |
1421 | + * | |
1422 | + * Returns true on success, false otherwise. | |
1423 | + */ | |
1424 | +bool ccs_dump_page(struct linux_binprm *bprm, unsigned long pos, | |
1425 | + struct ccs_page_dump *dump) | |
1426 | +{ | |
1427 | + struct page *page; | |
1428 | + /* dump->data is released by ccs_start_execve(). */ | |
1429 | + if (!dump->data) { | |
1430 | + dump->data = kzalloc(PAGE_SIZE, CCS_GFP_FLAGS); | |
1431 | + if (!dump->data) | |
1432 | + return false; | |
1433 | + } | |
1434 | + /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */ | |
1435 | +#ifdef CCS_BPRM_MMU | |
1436 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0) | |
1437 | + if (get_user_pages_remote(current, bprm->mm, pos, 1, FOLL_FORCE, &page, | |
1438 | + NULL, NULL) <= 0) | |
1439 | + return false; | |
1440 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0) | |
1441 | + if (get_user_pages_remote(current, bprm->mm, pos, 1, FOLL_FORCE, &page, | |
1442 | + NULL) <= 0) | |
1443 | + return false; | |
1444 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 4, 168) && LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0) | |
1445 | + if (get_user_pages(current, bprm->mm, pos, 1, FOLL_FORCE, &page, | |
1446 | + NULL) <= 0) | |
1447 | + return false; | |
1448 | +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 6, 0) | |
1449 | + if (get_user_pages_remote(current, bprm->mm, pos, 1, 0, 1, &page, | |
1450 | + NULL) <= 0) | |
1451 | + return false; | |
1452 | +#else | |
1453 | + if (get_user_pages(current, bprm->mm, pos, 1, 0, 1, &page, NULL) <= 0) | |
1454 | + return false; | |
1455 | +#endif | |
1456 | +#else | |
1457 | + page = bprm->page[pos / PAGE_SIZE]; | |
1458 | +#endif | |
1459 | + if (page != dump->page) { | |
1460 | + const unsigned int offset = pos % PAGE_SIZE; | |
1461 | + /* | |
1462 | + * Maybe kmap()/kunmap() should be used here. | |
1463 | + * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic(). | |
1464 | + * So do I. | |
1465 | + */ | |
1466 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37) | |
1467 | + char *kaddr = kmap_atomic(page); | |
1468 | +#else | |
1469 | + char *kaddr = kmap_atomic(page, KM_USER0); | |
1470 | +#endif | |
1471 | + dump->page = page; | |
1472 | + memcpy(dump->data + offset, kaddr + offset, | |
1473 | + PAGE_SIZE - offset); | |
1474 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37) | |
1475 | + kunmap_atomic(kaddr); | |
1476 | +#else | |
1477 | + kunmap_atomic(kaddr, KM_USER0); | |
1478 | +#endif | |
1479 | + } | |
1480 | + /* Same with put_arg_page(page) in fs/exec.c */ | |
1481 | +#ifdef CCS_BPRM_MMU | |
1482 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0) | |
1483 | + put_user_page(page); | |
1484 | +#else | |
1485 | + put_page(page); | |
1486 | +#endif | |
1487 | +#endif | |
1488 | + return true; | |
1489 | +} | |
1490 | + | |
1491 | +/** | |
1492 | + * ccs_start_execve - Prepare for execve() operation. | |
1493 | + * | |
1494 | + * @bprm: Pointer to "struct linux_binprm". | |
1495 | + * @eep: Pointer to "struct ccs_execve *". | |
1496 | + * | |
1497 | + * Returns 0 on success, negative value otherwise. | |
1498 | + */ | |
1499 | +int ccs_start_execve(struct linux_binprm *bprm, struct ccs_execve **eep) | |
1500 | +{ | |
1501 | + int retval; | |
1502 | + struct ccs_security *task = ccs_current_security(); | |
1503 | + struct ccs_execve *ee; | |
1504 | + int idx; | |
1505 | + *eep = NULL; | |
1506 | + ee = kzalloc(sizeof(*ee), CCS_GFP_FLAGS); | |
1507 | + if (!ee) | |
1508 | + return -ENOMEM; | |
1509 | + ee->tmp = kzalloc(CCS_EXEC_TMPSIZE, CCS_GFP_FLAGS); | |
1510 | + if (!ee->tmp) { | |
1511 | + kfree(ee); | |
1512 | + return -ENOMEM; | |
1513 | + } | |
1514 | + ccs_audit_alloc_execve(ee); | |
1515 | + idx = ccs_read_lock(); | |
1516 | + /* ee->dump->data is allocated by ccs_dump_page(). */ | |
1517 | + ee->previous_domain = task->ccs_domain_info; | |
1518 | + /* Clear manager flag. */ | |
1519 | + task->ccs_flags &= ~CCS_TASK_IS_MANAGER; | |
1520 | + *eep = ee; | |
1521 | + ccs_init_request_info(&ee->r, CCS_MAC_FILE_EXECUTE); | |
1522 | + ee->r.ee = ee; | |
1523 | + ee->bprm = bprm; | |
1524 | + ee->r.obj = &ee->obj; | |
1525 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) | |
1526 | + ee->obj.path1 = bprm->file->f_path; | |
1527 | +#else | |
1528 | + ee->obj.path1.dentry = bprm->file->f_dentry; | |
1529 | + ee->obj.path1.mnt = bprm->file->f_vfsmnt; | |
1530 | +#endif | |
1531 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
1532 | + /* | |
1533 | + * No need to call ccs_environ() for execute handler because envp[] is | |
1534 | + * moved to argv[]. | |
1535 | + */ | |
1536 | + if (ccs_find_execute_handler(ee, CCS_TYPE_AUTO_EXECUTE_HANDLER)) { | |
1537 | + retval = ccs_try_alt_exec(ee); | |
1538 | + goto done; | |
1539 | + } | |
1540 | +#endif | |
1541 | + retval = ccs_find_next_domain(ee); | |
1542 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
1543 | + if (retval == -EPERM && | |
1544 | + ccs_find_execute_handler(ee, CCS_TYPE_DENIED_EXECUTE_HANDLER)) { | |
1545 | + retval = ccs_try_alt_exec(ee); | |
1546 | + goto done; | |
1547 | + } | |
1548 | +#endif | |
1549 | +#ifdef CONFIG_CCSECURITY_MISC | |
1550 | + if (!retval) | |
1551 | + retval = ccs_environ(ee); | |
1552 | +#endif | |
1553 | +#ifdef CONFIG_CCSECURITY_TASK_EXECUTE_HANDLER | |
1554 | +done: | |
1555 | +#endif | |
1556 | + ccs_read_unlock(idx); | |
1557 | + kfree(ee->tmp); | |
1558 | + ee->tmp = NULL; | |
1559 | + kfree(ee->dump.data); | |
1560 | + ee->dump.data = NULL; | |
1561 | + return retval; | |
1562 | +} | |
1563 | + | |
1564 | +/** | |
1565 | + * ccs_finish_execve - Clean up execve() operation. | |
1566 | + * | |
1567 | + * @retval: Return code of an execve() operation. | |
1568 | + * @ee: Pointer to "struct ccs_execve". | |
1569 | + * | |
1570 | + * Returns nothing. | |
1571 | + */ | |
1572 | +void ccs_finish_execve(int retval, struct ccs_execve *ee) | |
1573 | +{ | |
1574 | + struct ccs_security *task = ccs_current_security(); | |
1575 | + if (!ee) | |
1576 | + return; | |
1577 | + if (retval < 0) { | |
1578 | + task->ccs_domain_info = ee->previous_domain; | |
1579 | + /* | |
1580 | + * Make task->ccs_domain_info visible to GC before changing | |
1581 | + * task->ccs_flags. | |
1582 | + */ | |
1583 | + smp_wmb(); | |
1584 | + } else { | |
1585 | + /* Mark the current process as execute handler. */ | |
1586 | + if (ee->handler) | |
1587 | + task->ccs_flags |= CCS_TASK_IS_EXECUTE_HANDLER; | |
1588 | + /* Mark the current process as normal process. */ | |
1589 | + else | |
1590 | + task->ccs_flags &= ~CCS_TASK_IS_EXECUTE_HANDLER; | |
1591 | + } | |
1592 | + /* Tell GC that I finished execve(). */ | |
1593 | + task->ccs_flags &= ~CCS_TASK_IS_IN_EXECVE; | |
1594 | + ccs_audit_free_execve(ee, true); | |
1595 | + kfree(ee->handler_path); | |
1596 | + kfree(ee); | |
1597 | +} | |
1598 | + | |
1599 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0) | |
1600 | + | |
1601 | +/** | |
1602 | + * __ccs_search_binary_handler - Main routine for do_execve(). | |
1603 | + * | |
1604 | + * @bprm: Pointer to "struct linux_binprm". | |
1605 | + * | |
1606 | + * Returns 0 on success, negative value otherwise. | |
1607 | + * | |
1608 | + * Performs permission checks for do_execve() and domain transition. | |
1609 | + * Domain transition by "struct ccs_domain_transition_control" and | |
1610 | + * "auto_domain_transition=" parameter of "struct ccs_condition" are reverted | |
1611 | + * if do_execve() failed. | |
1612 | + * Garbage collector does not remove "struct ccs_domain_info" from | |
1613 | + * ccs_domain_list nor kfree("struct ccs_domain_info") if the current thread is | |
1614 | + * marked as CCS_TASK_IS_IN_EXECVE. | |
1615 | + */ | |
1616 | +static int __ccs_search_binary_handler(struct linux_binprm *bprm) | |
1617 | +{ | |
1618 | + struct ccs_execve *ee; | |
1619 | + int retval; | |
1620 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
1621 | + if (!ccs_policy_loaded) | |
1622 | + ccsecurity_exports.load_policy(bprm->filename); | |
1623 | +#endif | |
1624 | + retval = ccs_start_execve(bprm, &ee); | |
1625 | + if (!retval) | |
1626 | + retval = search_binary_handler(bprm); | |
1627 | + ccs_finish_execve(retval, ee); | |
1628 | + return retval; | |
1629 | +} | |
1630 | + | |
1631 | +#else | |
1632 | + | |
1633 | +/** | |
1634 | + * __ccs_search_binary_handler - Main routine for do_execve(). | |
1635 | + * | |
1636 | + * @bprm: Pointer to "struct linux_binprm". | |
1637 | + * @regs: Pointer to "struct pt_regs". | |
1638 | + * | |
1639 | + * Returns 0 on success, negative value otherwise. | |
1640 | + * | |
1641 | + * Performs permission checks for do_execve() and domain transition. | |
1642 | + * Domain transition by "struct ccs_domain_transition_control" and | |
1643 | + * "auto_domain_transition=" parameter of "struct ccs_condition" are reverted | |
1644 | + * if do_execve() failed. | |
1645 | + * Garbage collector does not remove "struct ccs_domain_info" from | |
1646 | + * ccs_domain_list nor kfree("struct ccs_domain_info") if the current thread is | |
1647 | + * marked as CCS_TASK_IS_IN_EXECVE. | |
1648 | + */ | |
1649 | +static int __ccs_search_binary_handler(struct linux_binprm *bprm, | |
1650 | + struct pt_regs *regs) | |
1651 | +{ | |
1652 | + struct ccs_execve *ee; | |
1653 | + int retval; | |
1654 | +#ifndef CONFIG_CCSECURITY_OMIT_USERSPACE_LOADER | |
1655 | + if (!ccs_policy_loaded) | |
1656 | + ccsecurity_exports.load_policy(bprm->filename); | |
1657 | +#endif | |
1658 | + retval = ccs_start_execve(bprm, &ee); | |
1659 | + if (!retval) | |
1660 | + retval = search_binary_handler(bprm, regs); | |
1661 | + ccs_finish_execve(retval, ee); | |
1662 | + return retval; | |
1663 | +} | |
1664 | + | |
1665 | +#endif | |
1666 | + | |
1667 | +/** | |
1668 | + * ccs_permission_init - Register permission check hooks. | |
1669 | + * | |
1670 | + * Returns nothing. | |
1671 | + */ | |
1672 | +void __init ccs_permission_init(void) | |
1673 | +{ | |
1674 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 32) | |
1675 | + ccsecurity_ops.save_open_mode = __ccs_save_open_mode; | |
1676 | + ccsecurity_ops.clear_open_mode = __ccs_clear_open_mode; | |
1677 | + ccsecurity_ops.open_permission = __ccs_open_permission; | |
1678 | +#else | |
1679 | + ccsecurity_ops.open_permission = ccs_new_open_permission; | |
1680 | +#endif | |
1681 | + ccsecurity_ops.fcntl_permission = __ccs_fcntl_permission; | |
1682 | + ccsecurity_ops.ioctl_permission = __ccs_ioctl_permission; | |
1683 | + ccsecurity_ops.chmod_permission = __ccs_chmod_permission; | |
1684 | + ccsecurity_ops.chown_permission = __ccs_chown_permission; | |
1685 | +#ifdef CONFIG_CCSECURITY_FILE_GETATTR | |
1686 | + ccsecurity_ops.getattr_permission = __ccs_getattr_permission; | |
1687 | +#endif | |
1688 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) | |
1689 | + ccsecurity_ops.pivot_root_permission = __ccs_pivot_root_permission; | |
1690 | + ccsecurity_ops.chroot_permission = __ccs_chroot_permission; | |
1691 | +#else | |
1692 | + ccsecurity_ops.pivot_root_permission = ccs_old_pivot_root_permission; | |
1693 | + ccsecurity_ops.chroot_permission = ccs_old_chroot_permission; | |
1694 | +#endif | |
1695 | + ccsecurity_ops.umount_permission = __ccs_umount_permission; | |
1696 | + ccsecurity_ops.mknod_permission = __ccs_mknod_permission; | |
1697 | + ccsecurity_ops.mkdir_permission = __ccs_mkdir_permission; | |
1698 | + ccsecurity_ops.rmdir_permission = __ccs_rmdir_permission; | |
1699 | + ccsecurity_ops.unlink_permission = __ccs_unlink_permission; | |
1700 | + ccsecurity_ops.symlink_permission = __ccs_symlink_permission; | |
1701 | + ccsecurity_ops.truncate_permission = __ccs_truncate_permission; | |
1702 | + ccsecurity_ops.rename_permission = __ccs_rename_permission; | |
1703 | + ccsecurity_ops.link_permission = __ccs_link_permission; | |
1704 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30) | |
1705 | + ccsecurity_ops.open_exec_permission = __ccs_open_exec_permission; | |
1706 | + ccsecurity_ops.uselib_permission = __ccs_uselib_permission; | |
1707 | +#endif | |
1708 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) || (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33) && defined(CONFIG_SYSCTL_SYSCALL)) | |
1709 | + ccsecurity_ops.parse_table = __ccs_parse_table; | |
1710 | +#endif | |
1711 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) | |
1712 | + ccsecurity_ops.mount_permission = __ccs_mount_permission; | |
1713 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0) | |
1714 | + ccsecurity_ops.move_mount_permission = __ccs_move_mount_permission; | |
1715 | +#endif | |
1716 | +#else | |
1717 | + ccsecurity_ops.mount_permission = ccs_old_mount_permission; | |
1718 | +#endif | |
1719 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
1720 | + ccsecurity_ops.socket_create_permission = | |
1721 | + __ccs_socket_create_permission; | |
1722 | +#endif | |
1723 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
1724 | + ccsecurity_ops.socket_listen_permission = | |
1725 | + __ccs_socket_listen_permission; | |
1726 | + ccsecurity_ops.socket_connect_permission = | |
1727 | + __ccs_socket_connect_permission; | |
1728 | + ccsecurity_ops.socket_bind_permission = __ccs_socket_bind_permission; | |
1729 | + ccsecurity_ops.socket_post_accept_permission = | |
1730 | + __ccs_socket_post_accept_permission; | |
1731 | + ccsecurity_ops.socket_sendmsg_permission = | |
1732 | + __ccs_socket_sendmsg_permission; | |
1733 | +#endif | |
1734 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
1735 | + ccsecurity_ops.socket_post_recvmsg_permission = | |
1736 | + __ccs_socket_post_recvmsg_permission; | |
1737 | +#endif | |
1738 | +#ifdef CONFIG_CCSECURITY_IPC | |
1739 | + ccsecurity_ops.kill_permission = ccs_signal_acl; | |
1740 | + ccsecurity_ops.tgkill_permission = ccs_signal_acl0; | |
1741 | + ccsecurity_ops.tkill_permission = ccs_signal_acl; | |
1742 | + ccsecurity_ops.sigqueue_permission = ccs_signal_acl; | |
1743 | + ccsecurity_ops.tgsigqueue_permission = ccs_signal_acl0; | |
1744 | +#endif | |
1745 | +#ifdef CONFIG_CCSECURITY_CAPABILITY | |
1746 | + ccsecurity_ops.capable = __ccs_capable; | |
1747 | + ccsecurity_ops.ptrace_permission = __ccs_ptrace_permission; | |
1748 | +#endif | |
1749 | + ccsecurity_ops.search_binary_handler = __ccs_search_binary_handler; | |
1750 | +} | |
1751 | + | |
1752 | +/** | |
1753 | + * ccs_kern_path - Wrapper for kern_path(). | |
1754 | + * | |
1755 | + * @pathname: Pathname to resolve. Maybe NULL. | |
1756 | + * @flags: Lookup flags. | |
1757 | + * @path: Pointer to "struct path". | |
1758 | + * | |
1759 | + * Returns 0 on success, negative value otherwise. | |
1760 | + */ | |
1761 | +static int ccs_kern_path(const char *pathname, int flags, struct path *path) | |
1762 | +{ | |
1763 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28) | |
1764 | + if (!pathname || kern_path(pathname, flags, path)) | |
1765 | + return -ENOENT; | |
1766 | +#else | |
1767 | + struct nameidata nd; | |
1768 | + if (!pathname || path_lookup(pathname, flags, &nd)) | |
1769 | + return -ENOENT; | |
1770 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) | |
1771 | + *path = nd.path; | |
1772 | +#else | |
1773 | + path->dentry = nd.dentry; | |
1774 | + path->mnt = nd.mnt; | |
1775 | +#endif | |
1776 | +#endif | |
1777 | + return 0; | |
1778 | +} | |
1779 | + | |
1780 | +/** | |
1781 | + * ccs_get_path - Get dentry/vfsmmount of a pathname. | |
1782 | + * | |
1783 | + * @pathname: The pathname to solve. Maybe NULL. | |
1784 | + * @path: Pointer to "struct path". | |
1785 | + * | |
1786 | + * Returns 0 on success, negative value otherwise. | |
1787 | + */ | |
1788 | +static int ccs_get_path(const char *pathname, struct path *path) | |
1789 | +{ | |
1790 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) | |
1791 | + return ccs_kern_path(pathname, LOOKUP_FOLLOW, path); | |
1792 | +#else | |
1793 | + return ccs_kern_path(pathname, LOOKUP_FOLLOW | LOOKUP_POSITIVE, path); | |
1794 | +#endif | |
1795 | +} | |
1796 | + | |
1797 | +/** | |
1798 | + * ccs_symlink_path - Get symlink's pathname. | |
1799 | + * | |
1800 | + * @pathname: The pathname to solve. Maybe NULL. | |
1801 | + * @name: Pointer to "struct ccs_path_info". | |
1802 | + * | |
1803 | + * Returns 0 on success, negative value otherwise. | |
1804 | + * | |
1805 | + * This function uses kzalloc(), so caller must kfree() if this function | |
1806 | + * didn't return NULL. | |
1807 | + */ | |
1808 | +static int ccs_symlink_path(const char *pathname, struct ccs_path_info *name) | |
1809 | +{ | |
1810 | + char *buf; | |
1811 | + struct path path; | |
1812 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) | |
1813 | + if (ccs_kern_path(pathname, 0, &path)) | |
1814 | + return -ENOENT; | |
1815 | +#else | |
1816 | + if (ccs_kern_path(pathname, LOOKUP_POSITIVE, &path)) | |
1817 | + return -ENOENT; | |
1818 | +#endif | |
1819 | + buf = ccs_realpath(&path); | |
1820 | + path_put(&path); | |
1821 | + if (buf) { | |
1822 | + name->name = buf; | |
1823 | + ccs_fill_path_info(name); | |
1824 | + return 0; | |
1825 | + } | |
1826 | + return -ENOMEM; | |
1827 | +} | |
1828 | + | |
1829 | +/** | |
1830 | + * ccs_check_mount_acl - Check permission for path path path number operation. | |
1831 | + * | |
1832 | + * @r: Pointer to "struct ccs_request_info". | |
1833 | + * @ptr: Pointer to "struct ccs_acl_info". | |
1834 | + * | |
1835 | + * Returns true if granted, false otherwise. | |
1836 | + */ | |
1837 | +static bool ccs_check_mount_acl(struct ccs_request_info *r, | |
1838 | + const struct ccs_acl_info *ptr) | |
1839 | +{ | |
1840 | + const struct ccs_mount_acl *acl = | |
1841 | + container_of(ptr, typeof(*acl), head); | |
1842 | + return ccs_compare_number_union(r->param.mount.flags, &acl->flags) && | |
1843 | + ccs_compare_name_union(r->param.mount.type, &acl->fs_type) && | |
1844 | + ccs_compare_name_union(r->param.mount.dir, &acl->dir_name) && | |
1845 | + (!r->param.mount.need_dev || | |
1846 | + ccs_compare_name_union(r->param.mount.dev, &acl->dev_name)); | |
1847 | +} | |
1848 | + | |
1849 | +/** | |
1850 | + * ccs_mount_acl - Check permission for mount() operation. | |
1851 | + * | |
1852 | + * @r: Pointer to "struct ccs_request_info". | |
1853 | + * @dev_name: Name of device file. Maybe NULL. | |
1854 | + * @dir: Pointer to "struct path". | |
1855 | + * @type: Name of filesystem type. | |
1856 | + * @flags: Mount options. | |
1857 | + * | |
1858 | + * Returns 0 on success, negative value otherwise. | |
1859 | + * | |
1860 | + * Caller holds ccs_read_lock(). | |
1861 | + */ | |
1862 | +static int ccs_mount_acl(struct ccs_request_info *r, const char *dev_name, | |
1863 | + const struct path *dir, const char *type, | |
1864 | + unsigned long flags) | |
1865 | +{ | |
1866 | + struct ccs_obj_info obj = { }; | |
1867 | + struct file_system_type *fstype = NULL; | |
1868 | + const char *requested_type = NULL; | |
1869 | + const char *requested_dir_name = NULL; | |
1870 | + const char *requested_dev_name = NULL; | |
1871 | + struct ccs_path_info rtype; | |
1872 | + struct ccs_path_info rdev; | |
1873 | + struct ccs_path_info rdir; | |
1874 | + int need_dev = 0; | |
1875 | + int error = -ENOMEM; | |
1876 | + r->obj = &obj; | |
1877 | + | |
1878 | + /* Get fstype. */ | |
1879 | + requested_type = ccs_encode(type); | |
1880 | + if (!requested_type) | |
1881 | + goto out; | |
1882 | + rtype.name = requested_type; | |
1883 | + ccs_fill_path_info(&rtype); | |
1884 | + | |
1885 | + /* Get mount point. */ | |
1886 | + obj.path2 = *dir; | |
1887 | + requested_dir_name = ccs_realpath(dir); | |
1888 | + if (!requested_dir_name) { | |
1889 | + error = -ENOMEM; | |
1890 | + goto out; | |
1891 | + } | |
1892 | + rdir.name = requested_dir_name; | |
1893 | + ccs_fill_path_info(&rdir); | |
1894 | + | |
1895 | + /* Compare fs name. */ | |
1896 | + if (type == ccs_mounts[CCS_MOUNT_REMOUNT]) { | |
1897 | + /* dev_name is ignored. */ | |
1898 | + } else if (type == ccs_mounts[CCS_MOUNT_MAKE_UNBINDABLE] || | |
1899 | + type == ccs_mounts[CCS_MOUNT_MAKE_PRIVATE] || | |
1900 | + type == ccs_mounts[CCS_MOUNT_MAKE_SLAVE] || | |
1901 | + type == ccs_mounts[CCS_MOUNT_MAKE_SHARED]) { | |
1902 | + /* dev_name is ignored. */ | |
1903 | + } else if (type == ccs_mounts[CCS_MOUNT_BIND] || | |
1904 | + type == ccs_mounts[CCS_MOUNT_MOVE]) { | |
1905 | + need_dev = -1; /* dev_name is a directory */ | |
1906 | + } else { | |
1907 | + fstype = get_fs_type(type); | |
1908 | + if (!fstype) { | |
1909 | + error = -ENODEV; | |
1910 | + goto out; | |
1911 | + } | |
1912 | + if (fstype->fs_flags & FS_REQUIRES_DEV) | |
1913 | + /* dev_name is a block device file. */ | |
1914 | + need_dev = 1; | |
1915 | + } | |
1916 | + if (need_dev) { | |
1917 | + /* Get mount point or device file. */ | |
1918 | + if (ccs_get_path(dev_name, &obj.path1)) { | |
1919 | + error = -ENOENT; | |
1920 | + goto out; | |
1921 | + } | |
1922 | + requested_dev_name = ccs_realpath(&obj.path1); | |
1923 | + if (!requested_dev_name) { | |
1924 | + error = -ENOENT; | |
1925 | + goto out; | |
1926 | + } | |
1927 | + } else { | |
1928 | + /* Map dev_name to "<NULL>" if no dev_name given. */ | |
1929 | + if (!dev_name) | |
1930 | + dev_name = "<NULL>"; | |
1931 | + requested_dev_name = ccs_encode(dev_name); | |
1932 | + if (!requested_dev_name) { | |
1933 | + error = -ENOMEM; | |
1934 | + goto out; | |
1935 | + } | |
1936 | + } | |
1937 | + rdev.name = requested_dev_name; | |
1938 | + ccs_fill_path_info(&rdev); | |
1939 | + r->param_type = CCS_TYPE_MOUNT_ACL; | |
1940 | + r->param.mount.need_dev = need_dev; | |
1941 | + r->param.mount.dev = &rdev; | |
1942 | + r->param.mount.dir = &rdir; | |
1943 | + r->param.mount.type = &rtype; | |
1944 | + r->param.mount.flags = flags; | |
1945 | + error = ccs_check_acl(r); | |
1946 | +out: | |
1947 | + kfree(requested_dev_name); | |
1948 | + kfree(requested_dir_name); | |
1949 | + if (fstype) | |
1950 | + ccs_put_filesystem(fstype); | |
1951 | + kfree(requested_type); | |
1952 | + /* Drop refcount obtained by ccs_get_path(). */ | |
1953 | + if (obj.path1.dentry) | |
1954 | + path_put(&obj.path1); | |
1955 | + return error; | |
1956 | +} | |
1957 | + | |
1958 | +/** | |
1959 | + * __ccs_mount_permission - Check permission for mount() operation. | |
1960 | + * | |
1961 | + * @dev_name: Name of device file. Maybe NULL. | |
1962 | + * @path: Pointer to "struct path". | |
1963 | + * @type: Name of filesystem type. Maybe NULL. | |
1964 | + * @flags: Mount options. | |
1965 | + * @data_page: Optional data. Maybe NULL. | |
1966 | + * | |
1967 | + * Returns 0 on success, negative value otherwise. | |
1968 | + */ | |
1969 | +static int __ccs_mount_permission(const char *dev_name, | |
1970 | + const struct path *path, const char *type, | |
1971 | + unsigned long flags, void *data_page) | |
1972 | +{ | |
1973 | + struct ccs_request_info r; | |
1974 | + int error = 0; | |
1975 | + int idx; | |
1976 | + if ((flags & MS_MGC_MSK) == MS_MGC_VAL) | |
1977 | + flags &= ~MS_MGC_MSK; | |
1978 | + if (flags & MS_REMOUNT) { | |
1979 | + type = ccs_mounts[CCS_MOUNT_REMOUNT]; | |
1980 | + flags &= ~MS_REMOUNT; | |
1981 | + } else if (flags & MS_BIND) { | |
1982 | + type = ccs_mounts[CCS_MOUNT_BIND]; | |
1983 | + flags &= ~MS_BIND; | |
1984 | + } else if (flags & MS_SHARED) { | |
1985 | + if (flags & (MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE)) | |
1986 | + return -EINVAL; | |
1987 | + type = ccs_mounts[CCS_MOUNT_MAKE_SHARED]; | |
1988 | + flags &= ~MS_SHARED; | |
1989 | + } else if (flags & MS_PRIVATE) { | |
1990 | + if (flags & (MS_SHARED | MS_SLAVE | MS_UNBINDABLE)) | |
1991 | + return -EINVAL; | |
1992 | + type = ccs_mounts[CCS_MOUNT_MAKE_PRIVATE]; | |
1993 | + flags &= ~MS_PRIVATE; | |
1994 | + } else if (flags & MS_SLAVE) { | |
1995 | + if (flags & (MS_SHARED | MS_PRIVATE | MS_UNBINDABLE)) | |
1996 | + return -EINVAL; | |
1997 | + type = ccs_mounts[CCS_MOUNT_MAKE_SLAVE]; | |
1998 | + flags &= ~MS_SLAVE; | |
1999 | + } else if (flags & MS_UNBINDABLE) { | |
2000 | + if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE)) | |
2001 | + return -EINVAL; | |
2002 | + type = ccs_mounts[CCS_MOUNT_MAKE_UNBINDABLE]; | |
2003 | + flags &= ~MS_UNBINDABLE; | |
2004 | + } else if (flags & MS_MOVE) { | |
2005 | + type = ccs_mounts[CCS_MOUNT_MOVE]; | |
2006 | + flags &= ~MS_MOVE; | |
2007 | + } | |
2008 | + if (!type) | |
2009 | + type = "<NULL>"; | |
2010 | + idx = ccs_read_lock(); | |
2011 | + if (ccs_init_request_info(&r, CCS_MAC_FILE_MOUNT) | |
2012 | + != CCS_CONFIG_DISABLED) | |
2013 | + error = ccs_mount_acl(&r, dev_name, path, type, flags); | |
2014 | + ccs_read_unlock(idx); | |
2015 | + return error; | |
2016 | +} | |
2017 | + | |
2018 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) | |
2019 | + | |
2020 | +/** | |
2021 | + * ccs_old_mount_permission - Check permission for mount() operation. | |
2022 | + * | |
2023 | + * @dev_name: Name of device file. | |
2024 | + * @nd: Pointer to "struct nameidata". | |
2025 | + * @type: Name of filesystem type. Maybe NULL. | |
2026 | + * @flags: Mount options. | |
2027 | + * @data_page: Optional data. Maybe NULL. | |
2028 | + * | |
2029 | + * Returns 0 on success, negative value otherwise. | |
2030 | + */ | |
2031 | +static int ccs_old_mount_permission(const char *dev_name, struct nameidata *nd, | |
2032 | + const char *type, unsigned long flags, | |
2033 | + void *data_page) | |
2034 | +{ | |
2035 | + struct path path = { nd->mnt, nd->dentry }; | |
2036 | + return __ccs_mount_permission(dev_name, &path, type, flags, data_page); | |
2037 | +} | |
2038 | + | |
2039 | +#endif | |
2040 | + | |
2041 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0) | |
2042 | +/** | |
2043 | + * __ccs_move_mount_permission - Check permission for move_mount() operation. | |
2044 | + * | |
2045 | + * @from_path: Pointer to "struct path". | |
2046 | + * @to_path: Pointer to "struct path". | |
2047 | + * | |
2048 | + * Returns 0 on success, negative value otherwise. | |
2049 | + */ | |
2050 | +static int __ccs_move_mount_permission(const struct path *from_path, | |
2051 | + const struct path *to_path) | |
2052 | +{ | |
2053 | + return -ENOSYS; /* For now. */ | |
2054 | +} | |
2055 | +#endif | |
2056 | + | |
2057 | +/** | |
2058 | + * ccs_compare_number_union - Check whether a value matches "struct ccs_number_union" or not. | |
2059 | + * | |
2060 | + * @value: Number to check. | |
2061 | + * @ptr: Pointer to "struct ccs_number_union". | |
2062 | + * | |
2063 | + * Returns true if @value matches @ptr, false otherwise. | |
2064 | + */ | |
2065 | +static bool ccs_compare_number_union(const unsigned long value, | |
2066 | + const struct ccs_number_union *ptr) | |
2067 | +{ | |
2068 | + if (ptr->group) | |
2069 | + return ccs_number_matches_group(value, value, ptr->group); | |
2070 | + return value >= ptr->values[0] && value <= ptr->values[1]; | |
2071 | +} | |
2072 | + | |
2073 | +/** | |
2074 | + * ccs_compare_name_union - Check whether a name matches "struct ccs_name_union" or not. | |
2075 | + * | |
2076 | + * @name: Pointer to "struct ccs_path_info". | |
2077 | + * @ptr: Pointer to "struct ccs_name_union". | |
2078 | + * | |
2079 | + * Returns "struct ccs_path_info" if @name matches @ptr, NULL otherwise. | |
2080 | + */ | |
2081 | +static const struct ccs_path_info *ccs_compare_name_union | |
2082 | +(const struct ccs_path_info *name, const struct ccs_name_union *ptr) | |
2083 | +{ | |
2084 | + if (ptr->group) | |
2085 | + return ccs_path_matches_group(name, ptr->group); | |
2086 | + if (ccs_path_matches_pattern(name, ptr->filename)) | |
2087 | + return ptr->filename; | |
2088 | + return NULL; | |
2089 | +} | |
2090 | + | |
2091 | +/** | |
2092 | + * ccs_add_slash - Add trailing '/' if needed. | |
2093 | + * | |
2094 | + * @buf: Pointer to "struct ccs_path_info". | |
2095 | + * | |
2096 | + * Returns nothing. | |
2097 | + * | |
2098 | + * @buf must be generated by ccs_encode() because this function does not | |
2099 | + * allocate memory for adding '/'. | |
2100 | + */ | |
2101 | +static void ccs_add_slash(struct ccs_path_info *buf) | |
2102 | +{ | |
2103 | + if (buf->is_dir) | |
2104 | + return; | |
2105 | + /* This is OK because ccs_encode() reserves space for appending "/". */ | |
2106 | + strcat((char *) buf->name, "/"); | |
2107 | + ccs_fill_path_info(buf); | |
2108 | +} | |
2109 | + | |
2110 | +/** | |
2111 | + * ccs_get_realpath - Get realpath. | |
2112 | + * | |
2113 | + * @buf: Pointer to "struct ccs_path_info". | |
2114 | + * @path: Pointer to "struct path". @path->mnt may be NULL. | |
2115 | + * | |
2116 | + * Returns true on success, false otherwise. | |
2117 | + */ | |
2118 | +static bool ccs_get_realpath(struct ccs_path_info *buf, struct path *path) | |
2119 | +{ | |
2120 | + buf->name = ccs_realpath(path); | |
2121 | + if (buf->name) { | |
2122 | + ccs_fill_path_info(buf); | |
2123 | + return true; | |
2124 | + } | |
2125 | + return false; | |
2126 | +} | |
2127 | + | |
2128 | +/** | |
2129 | + * ccs_check_path_acl - Check permission for path operation. | |
2130 | + * | |
2131 | + * @r: Pointer to "struct ccs_request_info". | |
2132 | + * @ptr: Pointer to "struct ccs_acl_info". | |
2133 | + * | |
2134 | + * Returns true if granted, false otherwise. | |
2135 | + * | |
2136 | + * To be able to use wildcard for domain transition, this function sets | |
2137 | + * matching entry on success. Since the caller holds ccs_read_lock(), | |
2138 | + * it is safe to set matching entry. | |
2139 | + */ | |
2140 | +static bool ccs_check_path_acl(struct ccs_request_info *r, | |
2141 | + const struct ccs_acl_info *ptr) | |
2142 | +{ | |
2143 | + const struct ccs_path_acl *acl = container_of(ptr, typeof(*acl), head); | |
2144 | + if (ptr->perm & (1 << r->param.path.operation)) { | |
2145 | + r->param.path.matched_path = | |
2146 | + ccs_compare_name_union(r->param.path.filename, | |
2147 | + &acl->name); | |
2148 | + return r->param.path.matched_path != NULL; | |
2149 | + } | |
2150 | + return false; | |
2151 | +} | |
2152 | + | |
2153 | +/** | |
2154 | + * ccs_check_path_number_acl - Check permission for path number operation. | |
2155 | + * | |
2156 | + * @r: Pointer to "struct ccs_request_info". | |
2157 | + * @ptr: Pointer to "struct ccs_acl_info". | |
2158 | + * | |
2159 | + * Returns true if granted, false otherwise. | |
2160 | + */ | |
2161 | +static bool ccs_check_path_number_acl(struct ccs_request_info *r, | |
2162 | + const struct ccs_acl_info *ptr) | |
2163 | +{ | |
2164 | + const struct ccs_path_number_acl *acl = | |
2165 | + container_of(ptr, typeof(*acl), head); | |
2166 | + return (ptr->perm & (1 << r->param.path_number.operation)) && | |
2167 | + ccs_compare_number_union(r->param.path_number.number, | |
2168 | + &acl->number) && | |
2169 | + ccs_compare_name_union(r->param.path_number.filename, | |
2170 | + &acl->name); | |
2171 | +} | |
2172 | + | |
2173 | +/** | |
2174 | + * ccs_check_path2_acl - Check permission for path path operation. | |
2175 | + * | |
2176 | + * @r: Pointer to "struct ccs_request_info". | |
2177 | + * @ptr: Pointer to "struct ccs_acl_info". | |
2178 | + * | |
2179 | + * Returns true if granted, false otherwise. | |
2180 | + */ | |
2181 | +static bool ccs_check_path2_acl(struct ccs_request_info *r, | |
2182 | + const struct ccs_acl_info *ptr) | |
2183 | +{ | |
2184 | + const struct ccs_path2_acl *acl = | |
2185 | + container_of(ptr, typeof(*acl), head); | |
2186 | + return (ptr->perm & (1 << r->param.path2.operation)) && | |
2187 | + ccs_compare_name_union(r->param.path2.filename1, &acl->name1) | |
2188 | + && ccs_compare_name_union(r->param.path2.filename2, | |
2189 | + &acl->name2); | |
2190 | +} | |
2191 | + | |
2192 | +/** | |
2193 | + * ccs_check_mkdev_acl - Check permission for path number number number operation. | |
2194 | + * | |
2195 | + * @r: Pointer to "struct ccs_request_info". | |
2196 | + * @ptr: Pointer to "struct ccs_acl_info". | |
2197 | + * | |
2198 | + * Returns true if granted, false otherwise. | |
2199 | + */ | |
2200 | +static bool ccs_check_mkdev_acl(struct ccs_request_info *r, | |
2201 | + const struct ccs_acl_info *ptr) | |
2202 | +{ | |
2203 | + const struct ccs_mkdev_acl *acl = | |
2204 | + container_of(ptr, typeof(*acl), head); | |
2205 | + return (ptr->perm & (1 << r->param.mkdev.operation)) && | |
2206 | + ccs_compare_number_union(r->param.mkdev.mode, &acl->mode) && | |
2207 | + ccs_compare_number_union(r->param.mkdev.major, &acl->major) && | |
2208 | + ccs_compare_number_union(r->param.mkdev.minor, &acl->minor) && | |
2209 | + ccs_compare_name_union(r->param.mkdev.filename, &acl->name); | |
2210 | +} | |
2211 | + | |
2212 | +/** | |
2213 | + * ccs_path_permission - Check permission for path operation. | |
2214 | + * | |
2215 | + * @r: Pointer to "struct ccs_request_info". | |
2216 | + * @operation: Type of operation. | |
2217 | + * @filename: Filename to check. | |
2218 | + * | |
2219 | + * Returns 0 on success, negative value otherwise. | |
2220 | + * | |
2221 | + * Caller holds ccs_read_lock(). | |
2222 | + */ | |
2223 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 21) || LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) || !defined(CONFIG_SYSCTL_SYSCALL) | |
2224 | +static | |
2225 | +#endif | |
2226 | +int ccs_path_permission(struct ccs_request_info *r, u8 operation, | |
2227 | + const struct ccs_path_info *filename) | |
2228 | +{ | |
2229 | + r->type = ccs_p2mac[operation]; | |
2230 | + r->mode = ccs_get_mode(r->profile, r->type); | |
2231 | + if (r->mode == CCS_CONFIG_DISABLED) | |
2232 | + return 0; | |
2233 | + r->param_type = CCS_TYPE_PATH_ACL; | |
2234 | + r->param.path.filename = filename; | |
2235 | + r->param.path.operation = operation; | |
2236 | + return ccs_check_acl(r); | |
2237 | +} | |
2238 | + | |
2239 | +/** | |
2240 | + * ccs_execute_permission - Check permission for execute operation. | |
2241 | + * | |
2242 | + * @r: Pointer to "struct ccs_request_info". | |
2243 | + * @filename: Filename to check. | |
2244 | + * | |
2245 | + * Returns 0 on success, CCS_RETRY_REQUEST on retry, negative value otherwise. | |
2246 | + * | |
2247 | + * Caller holds ccs_read_lock(). | |
2248 | + */ | |
2249 | +static int ccs_execute_permission(struct ccs_request_info *r, | |
2250 | + const struct ccs_path_info *filename) | |
2251 | +{ | |
2252 | + int error; | |
2253 | + /* | |
2254 | + * Unlike other permission checks, this check is done regardless of | |
2255 | + * profile mode settings in order to check for domain transition | |
2256 | + * preference. | |
2257 | + */ | |
2258 | + r->type = CCS_MAC_FILE_EXECUTE; | |
2259 | + r->mode = ccs_get_mode(r->profile, r->type); | |
2260 | + r->param_type = CCS_TYPE_PATH_ACL; | |
2261 | + r->param.path.filename = filename; | |
2262 | + r->param.path.operation = CCS_TYPE_EXECUTE; | |
2263 | + error = ccs_check_acl(r); | |
2264 | + r->ee->transition = r->matched_acl && r->matched_acl->cond && | |
2265 | + r->matched_acl->cond->exec_transit ? | |
2266 | + r->matched_acl->cond->transit : NULL; | |
2267 | + return error; | |
2268 | +} | |
2269 | + | |
2270 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 32) | |
2271 | + | |
2272 | +/** | |
2273 | + * __ccs_save_open_mode - Remember original flags passed to sys_open(). | |
2274 | + * | |
2275 | + * @mode: Flags passed to sys_open(). | |
2276 | + * | |
2277 | + * Returns nothing. | |
2278 | + * | |
2279 | + * TOMOYO does not check "file write" if open(path, O_TRUNC | O_RDONLY) was | |
2280 | + * requested because write() is not permitted. Instead, TOMOYO checks | |
2281 | + * "file truncate" if O_TRUNC is passed. | |
2282 | + * | |
2283 | + * TOMOYO does not check "file read" and "file write" if open(path, 3) was | |
2284 | + * requested because read()/write() are not permitted. Instead, TOMOYO checks | |
2285 | + * "file ioctl" when ioctl() is requested. | |
2286 | + */ | |
2287 | +static void __ccs_save_open_mode(int mode) | |
2288 | +{ | |
2289 | + if ((mode & 3) == 3) | |
2290 | + ccs_current_security()->ccs_flags |= CCS_OPEN_FOR_IOCTL_ONLY; | |
2291 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 14) | |
2292 | + /* O_TRUNC passes MAY_WRITE to ccs_open_permission(). */ | |
2293 | + else if (!(mode & 3) && (mode & O_TRUNC)) | |
2294 | + ccs_current_security()->ccs_flags |= | |
2295 | + CCS_OPEN_FOR_READ_TRUNCATE; | |
2296 | +#endif | |
2297 | +} | |
2298 | + | |
2299 | +/** | |
2300 | + * __ccs_clear_open_mode - Forget original flags passed to sys_open(). | |
2301 | + * | |
2302 | + * Returns nothing. | |
2303 | + */ | |
2304 | +static void __ccs_clear_open_mode(void) | |
2305 | +{ | |
2306 | + ccs_current_security()->ccs_flags &= ~(CCS_OPEN_FOR_IOCTL_ONLY | | |
2307 | + CCS_OPEN_FOR_READ_TRUNCATE); | |
2308 | +} | |
2309 | + | |
2310 | +#endif | |
2311 | + | |
2312 | +/** | |
2313 | + * __ccs_open_permission - Check permission for "read" and "write". | |
2314 | + * | |
2315 | + * @dentry: Pointer to "struct dentry". | |
2316 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2317 | + * @flag: Flags for open(). | |
2318 | + * | |
2319 | + * Returns 0 on success, negative value otherwise. | |
2320 | + */ | |
2321 | +static int __ccs_open_permission(struct dentry *dentry, struct vfsmount *mnt, | |
2322 | + const int flag) | |
2323 | +{ | |
2324 | + struct ccs_request_info r; | |
2325 | + struct ccs_obj_info obj = { | |
2326 | + .path1.dentry = dentry, | |
2327 | + .path1.mnt = mnt, | |
2328 | + }; | |
2329 | + const u32 ccs_flags = ccs_current_flags(); | |
2330 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) | |
2331 | + const u8 acc_mode = (flag & 3) == 3 ? 0 : ACC_MODE(flag); | |
2332 | +#else | |
2333 | + const u8 acc_mode = (ccs_flags & CCS_OPEN_FOR_IOCTL_ONLY) ? 0 : | |
2334 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 14) | |
2335 | + (ccs_flags & CCS_OPEN_FOR_READ_TRUNCATE) ? 4 : | |
2336 | +#endif | |
2337 | + ACC_MODE(flag); | |
2338 | +#endif | |
2339 | + int error = 0; | |
2340 | + struct ccs_path_info buf; | |
2341 | + int idx; | |
2342 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30) | |
2343 | + if (current->in_execve && !(ccs_flags & CCS_TASK_IS_IN_EXECVE)) | |
2344 | + return 0; | |
2345 | +#endif | |
2346 | +#ifndef CONFIG_CCSECURITY_FILE_READDIR | |
2347 | + if (d_is_dir(dentry)) | |
2348 | + return 0; | |
2349 | +#endif | |
2350 | + /* Sockets can't be opened by open(). */ | |
2351 | + if (S_ISSOCK(d_inode(dentry)->i_mode)) | |
2352 | + return 0; | |
2353 | + buf.name = NULL; | |
2354 | + r.mode = CCS_CONFIG_DISABLED; | |
2355 | + idx = ccs_read_lock(); | |
2356 | + if (acc_mode && ccs_init_request_info(&r, CCS_MAC_FILE_OPEN) | |
2357 | + != CCS_CONFIG_DISABLED) { | |
2358 | + if (!ccs_get_realpath(&buf, &obj.path1)) { | |
2359 | + error = -ENOMEM; | |
2360 | + goto out; | |
2361 | + } | |
2362 | + r.obj = &obj; | |
2363 | + if (acc_mode & MAY_READ) | |
2364 | + error = ccs_path_permission(&r, CCS_TYPE_READ, &buf); | |
2365 | + if (!error && (acc_mode & MAY_WRITE)) | |
2366 | + error = ccs_path_permission(&r, (flag & O_APPEND) ? | |
2367 | + CCS_TYPE_APPEND : | |
2368 | + CCS_TYPE_WRITE, &buf); | |
2369 | + } | |
2370 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 32) | |
2371 | + if (!error && (flag & O_TRUNC) && | |
2372 | + ccs_init_request_info(&r, CCS_MAC_FILE_TRUNCATE) | |
2373 | + != CCS_CONFIG_DISABLED) { | |
2374 | + if (!buf.name && !ccs_get_realpath(&buf, &obj.path1)) { | |
2375 | + error = -ENOMEM; | |
2376 | + goto out; | |
2377 | + } | |
2378 | + r.obj = &obj; | |
2379 | + error = ccs_path_permission(&r, CCS_TYPE_TRUNCATE, &buf); | |
2380 | + } | |
2381 | +#endif | |
2382 | +out: | |
2383 | + kfree(buf.name); | |
2384 | + ccs_read_unlock(idx); | |
2385 | + if (r.mode != CCS_CONFIG_ENFORCING) | |
2386 | + error = 0; | |
2387 | + return error; | |
2388 | +} | |
2389 | + | |
2390 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) | |
2391 | + | |
2392 | +/** | |
2393 | + * ccs_new_open_permission - Check permission for "read" and "write". | |
2394 | + * | |
2395 | + * @filp: Pointer to "struct file". | |
2396 | + * | |
2397 | + * Returns 0 on success, negative value otherwise. | |
2398 | + */ | |
2399 | +static int ccs_new_open_permission(struct file *filp) | |
2400 | +{ | |
2401 | + return __ccs_open_permission(filp->f_path.dentry, filp->f_path.mnt, | |
2402 | + filp->f_flags); | |
2403 | +} | |
2404 | + | |
2405 | +#endif | |
2406 | + | |
2407 | +/** | |
2408 | + * ccs_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "append", "getattr", "chroot" and "unmount". | |
2409 | + * | |
2410 | + * @operation: Type of operation. | |
2411 | + * @dentry: Pointer to "struct dentry". | |
2412 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2413 | + * @target: Symlink's target if @operation is CCS_TYPE_SYMLINK, | |
2414 | + * NULL otherwise. | |
2415 | + * | |
2416 | + * Returns 0 on success, negative value otherwise. | |
2417 | + */ | |
2418 | +static int ccs_path_perm(const u8 operation, struct dentry *dentry, | |
2419 | + struct vfsmount *mnt, const char *target) | |
2420 | +{ | |
2421 | + struct ccs_request_info r; | |
2422 | + struct ccs_obj_info obj = { | |
2423 | + .path1.dentry = dentry, | |
2424 | + .path1.mnt = mnt, | |
2425 | + }; | |
2426 | + int error = 0; | |
2427 | + struct ccs_path_info buf; | |
2428 | + bool is_enforce = false; | |
2429 | + struct ccs_path_info symlink_target; | |
2430 | + int idx; | |
2431 | + buf.name = NULL; | |
2432 | + symlink_target.name = NULL; | |
2433 | + idx = ccs_read_lock(); | |
2434 | + if (ccs_init_request_info(&r, ccs_p2mac[operation]) | |
2435 | + == CCS_CONFIG_DISABLED) | |
2436 | + goto out; | |
2437 | + is_enforce = (r.mode == CCS_CONFIG_ENFORCING); | |
2438 | + error = -ENOMEM; | |
2439 | + if (!ccs_get_realpath(&buf, &obj.path1)) | |
2440 | + goto out; | |
2441 | + r.obj = &obj; | |
2442 | + switch (operation) { | |
2443 | + case CCS_TYPE_RMDIR: | |
2444 | + case CCS_TYPE_CHROOT: | |
2445 | + ccs_add_slash(&buf); | |
2446 | + break; | |
2447 | + case CCS_TYPE_SYMLINK: | |
2448 | + symlink_target.name = ccs_encode(target); | |
2449 | + if (!symlink_target.name) | |
2450 | + goto out; | |
2451 | + ccs_fill_path_info(&symlink_target); | |
2452 | + obj.symlink_target = &symlink_target; | |
2453 | + break; | |
2454 | + } | |
2455 | + error = ccs_path_permission(&r, operation, &buf); | |
2456 | + if (operation == CCS_TYPE_SYMLINK) | |
2457 | + kfree(symlink_target.name); | |
2458 | +out: | |
2459 | + kfree(buf.name); | |
2460 | + ccs_read_unlock(idx); | |
2461 | + if (!is_enforce) | |
2462 | + error = 0; | |
2463 | + return error; | |
2464 | +} | |
2465 | + | |
2466 | +/** | |
2467 | + * ccs_mkdev_perm - Check permission for "mkblock" and "mkchar". | |
2468 | + * | |
2469 | + * @operation: Type of operation. (CCS_TYPE_MKCHAR or CCS_TYPE_MKBLOCK) | |
2470 | + * @dentry: Pointer to "struct dentry". | |
2471 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2472 | + * @mode: Create mode. | |
2473 | + * @dev: Device number. | |
2474 | + * | |
2475 | + * Returns 0 on success, negative value otherwise. | |
2476 | + */ | |
2477 | +static int ccs_mkdev_perm(const u8 operation, struct dentry *dentry, | |
2478 | + struct vfsmount *mnt, const unsigned int mode, | |
2479 | + unsigned int dev) | |
2480 | +{ | |
2481 | + struct ccs_request_info r; | |
2482 | + struct ccs_obj_info obj = { | |
2483 | + .path1.dentry = dentry, | |
2484 | + .path1.mnt = mnt, | |
2485 | + }; | |
2486 | + int error = 0; | |
2487 | + struct ccs_path_info buf; | |
2488 | + bool is_enforce = false; | |
2489 | + int idx; | |
2490 | + idx = ccs_read_lock(); | |
2491 | + if (ccs_init_request_info(&r, ccs_pnnn2mac[operation]) | |
2492 | + == CCS_CONFIG_DISABLED) | |
2493 | + goto out; | |
2494 | + is_enforce = (r.mode == CCS_CONFIG_ENFORCING); | |
2495 | + error = -EPERM; | |
2496 | + if (!capable(CAP_MKNOD)) | |
2497 | + goto out; | |
2498 | + error = -ENOMEM; | |
2499 | + if (!ccs_get_realpath(&buf, &obj.path1)) | |
2500 | + goto out; | |
2501 | + r.obj = &obj; | |
2502 | +#ifdef CONFIG_SECURITY_PATH | |
2503 | + dev = new_decode_dev(dev); | |
2504 | +#endif | |
2505 | + r.param_type = CCS_TYPE_MKDEV_ACL; | |
2506 | + r.param.mkdev.filename = &buf; | |
2507 | + r.param.mkdev.operation = operation; | |
2508 | + r.param.mkdev.mode = mode; | |
2509 | + r.param.mkdev.major = MAJOR(dev); | |
2510 | + r.param.mkdev.minor = MINOR(dev); | |
2511 | + error = ccs_check_acl(&r); | |
2512 | + kfree(buf.name); | |
2513 | +out: | |
2514 | + ccs_read_unlock(idx); | |
2515 | + if (!is_enforce) | |
2516 | + error = 0; | |
2517 | + return error; | |
2518 | +} | |
2519 | + | |
2520 | +/** | |
2521 | + * ccs_path2_perm - Check permission for "rename", "link" and "pivot_root". | |
2522 | + * | |
2523 | + * @operation: Type of operation. | |
2524 | + * @dentry1: Pointer to "struct dentry". | |
2525 | + * @mnt1: Pointer to "struct vfsmount". Maybe NULL. | |
2526 | + * @dentry2: Pointer to "struct dentry". | |
2527 | + * @mnt2: Pointer to "struct vfsmount". Maybe NULL. | |
2528 | + * | |
2529 | + * Returns 0 on success, negative value otherwise. | |
2530 | + */ | |
2531 | +static int ccs_path2_perm(const u8 operation, struct dentry *dentry1, | |
2532 | + struct vfsmount *mnt1, struct dentry *dentry2, | |
2533 | + struct vfsmount *mnt2) | |
2534 | +{ | |
2535 | + struct ccs_request_info r; | |
2536 | + int error = 0; | |
2537 | + struct ccs_path_info buf1; | |
2538 | + struct ccs_path_info buf2; | |
2539 | + bool is_enforce = false; | |
2540 | + struct ccs_obj_info obj = { | |
2541 | + .path1.dentry = dentry1, | |
2542 | + .path1.mnt = mnt1, | |
2543 | + .path2.dentry = dentry2, | |
2544 | + .path2.mnt = mnt2, | |
2545 | + }; | |
2546 | + int idx; | |
2547 | + buf1.name = NULL; | |
2548 | + buf2.name = NULL; | |
2549 | + idx = ccs_read_lock(); | |
2550 | + if (ccs_init_request_info(&r, ccs_pp2mac[operation]) | |
2551 | + == CCS_CONFIG_DISABLED) | |
2552 | + goto out; | |
2553 | + is_enforce = (r.mode == CCS_CONFIG_ENFORCING); | |
2554 | + error = -ENOMEM; | |
2555 | + if (!ccs_get_realpath(&buf1, &obj.path1) || | |
2556 | + !ccs_get_realpath(&buf2, &obj.path2)) | |
2557 | + goto out; | |
2558 | + switch (operation) { | |
2559 | + case CCS_TYPE_RENAME: | |
2560 | + case CCS_TYPE_LINK: | |
2561 | + if (!d_is_dir(dentry1)) | |
2562 | + break; | |
2563 | + /* fall through */ | |
2564 | + case CCS_TYPE_PIVOT_ROOT: | |
2565 | + ccs_add_slash(&buf1); | |
2566 | + ccs_add_slash(&buf2); | |
2567 | + break; | |
2568 | + } | |
2569 | + r.obj = &obj; | |
2570 | + r.param_type = CCS_TYPE_PATH2_ACL; | |
2571 | + r.param.path2.operation = operation; | |
2572 | + r.param.path2.filename1 = &buf1; | |
2573 | + r.param.path2.filename2 = &buf2; | |
2574 | + error = ccs_check_acl(&r); | |
2575 | +out: | |
2576 | + kfree(buf1.name); | |
2577 | + kfree(buf2.name); | |
2578 | + ccs_read_unlock(idx); | |
2579 | + if (!is_enforce) | |
2580 | + error = 0; | |
2581 | + return error; | |
2582 | +} | |
2583 | + | |
2584 | +/** | |
2585 | + * ccs_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp". | |
2586 | + * | |
2587 | + * @type: Type of operation. | |
2588 | + * @dentry: Pointer to "struct dentry". | |
2589 | + * @vfsmnt: Pointer to "struct vfsmount". Maybe NULL. | |
2590 | + * @number: Number. | |
2591 | + * | |
2592 | + * Returns 0 on success, negative value otherwise. | |
2593 | + */ | |
2594 | +static int ccs_path_number_perm(const u8 type, struct dentry *dentry, | |
2595 | + struct vfsmount *vfsmnt, unsigned long number) | |
2596 | +{ | |
2597 | + struct ccs_request_info r; | |
2598 | + struct ccs_obj_info obj = { | |
2599 | + .path1.dentry = dentry, | |
2600 | + .path1.mnt = vfsmnt, | |
2601 | + }; | |
2602 | + int error = 0; | |
2603 | + struct ccs_path_info buf; | |
2604 | + int idx; | |
2605 | + if (!dentry) | |
2606 | + return 0; | |
2607 | + idx = ccs_read_lock(); | |
2608 | + if (ccs_init_request_info(&r, ccs_pn2mac[type]) == CCS_CONFIG_DISABLED) | |
2609 | + goto out; | |
2610 | + error = -ENOMEM; | |
2611 | + if (!ccs_get_realpath(&buf, &obj.path1)) | |
2612 | + goto out; | |
2613 | + r.obj = &obj; | |
2614 | + if (type == CCS_TYPE_MKDIR) | |
2615 | + ccs_add_slash(&buf); | |
2616 | + r.param_type = CCS_TYPE_PATH_NUMBER_ACL; | |
2617 | + r.param.path_number.operation = type; | |
2618 | + r.param.path_number.filename = &buf; | |
2619 | + r.param.path_number.number = number; | |
2620 | + error = ccs_check_acl(&r); | |
2621 | + kfree(buf.name); | |
2622 | +out: | |
2623 | + ccs_read_unlock(idx); | |
2624 | + if (r.mode != CCS_CONFIG_ENFORCING) | |
2625 | + error = 0; | |
2626 | + return error; | |
2627 | +} | |
2628 | + | |
2629 | +/** | |
2630 | + * __ccs_ioctl_permission - Check permission for "ioctl". | |
2631 | + * | |
2632 | + * @filp: Pointer to "struct file". | |
2633 | + * @cmd: Ioctl command number. | |
2634 | + * @arg: Param for @cmd. | |
2635 | + * | |
2636 | + * Returns 0 on success, negative value otherwise. | |
2637 | + */ | |
2638 | +static int __ccs_ioctl_permission(struct file *filp, unsigned int cmd, | |
2639 | + unsigned long arg) | |
2640 | +{ | |
2641 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) | |
2642 | + return ccs_path_number_perm(CCS_TYPE_IOCTL, filp->f_path.dentry, | |
2643 | + filp->f_path.mnt, cmd); | |
2644 | +#else | |
2645 | + return ccs_path_number_perm(CCS_TYPE_IOCTL, filp->f_dentry, | |
2646 | + filp->f_vfsmnt, cmd); | |
2647 | +#endif | |
2648 | +} | |
2649 | + | |
2650 | +/** | |
2651 | + * __ccs_chmod_permission - Check permission for "chmod". | |
2652 | + * | |
2653 | + * @dentry: Pointer to "struct dentry". | |
2654 | + * @vfsmnt: Pointer to "struct vfsmount". Maybe NULL. | |
2655 | + * @mode: Mode. | |
2656 | + * | |
2657 | + * Returns 0 on success, negative value otherwise. | |
2658 | + */ | |
2659 | +static int __ccs_chmod_permission(struct dentry *dentry, | |
2660 | + struct vfsmount *vfsmnt, mode_t mode) | |
2661 | +{ | |
2662 | + return ccs_path_number_perm(CCS_TYPE_CHMOD, dentry, vfsmnt, | |
2663 | + mode & S_IALLUGO); | |
2664 | +} | |
2665 | + | |
2666 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0) | |
2667 | + | |
2668 | +/** | |
2669 | + * __ccs_chown_permission - Check permission for "chown/chgrp". | |
2670 | + * | |
2671 | + * @dentry: Pointer to "struct dentry". | |
2672 | + * @vfsmnt: Pointer to "struct vfsmount". Maybe NULL. | |
2673 | + * @user: User ID. | |
2674 | + * @group: Group ID. | |
2675 | + * | |
2676 | + * Returns 0 on success, negative value otherwise. | |
2677 | + */ | |
2678 | +static int __ccs_chown_permission(struct dentry *dentry, | |
2679 | + struct vfsmount *vfsmnt, kuid_t user, | |
2680 | + kgid_t group) | |
2681 | +{ | |
2682 | + int error = 0; | |
2683 | + if (uid_valid(user)) | |
2684 | + error = ccs_path_number_perm(CCS_TYPE_CHOWN, dentry, vfsmnt, | |
2685 | + from_kuid(&init_user_ns, user)); | |
2686 | + if (!error && gid_valid(group)) | |
2687 | + error = ccs_path_number_perm(CCS_TYPE_CHGRP, dentry, vfsmnt, | |
2688 | + from_kgid(&init_user_ns, group)); | |
2689 | + return error; | |
2690 | +} | |
2691 | + | |
2692 | +#else | |
2693 | + | |
2694 | +/** | |
2695 | + * __ccs_chown_permission - Check permission for "chown/chgrp". | |
2696 | + * | |
2697 | + * @dentry: Pointer to "struct dentry". | |
2698 | + * @vfsmnt: Pointer to "struct vfsmount". Maybe NULL. | |
2699 | + * @user: User ID. | |
2700 | + * @group: Group ID. | |
2701 | + * | |
2702 | + * Returns 0 on success, negative value otherwise. | |
2703 | + */ | |
2704 | +static int __ccs_chown_permission(struct dentry *dentry, | |
2705 | + struct vfsmount *vfsmnt, uid_t user, | |
2706 | + gid_t group) | |
2707 | +{ | |
2708 | + int error = 0; | |
2709 | + if (user == (uid_t) -1 && group == (gid_t) -1) | |
2710 | + return 0; | |
2711 | + if (user != (uid_t) -1) | |
2712 | + error = ccs_path_number_perm(CCS_TYPE_CHOWN, dentry, vfsmnt, | |
2713 | + user); | |
2714 | + if (!error && group != (gid_t) -1) | |
2715 | + error = ccs_path_number_perm(CCS_TYPE_CHGRP, dentry, vfsmnt, | |
2716 | + group); | |
2717 | + return error; | |
2718 | +} | |
2719 | + | |
2720 | +#endif | |
2721 | + | |
2722 | +/** | |
2723 | + * __ccs_fcntl_permission - Check permission for changing O_APPEND flag. | |
2724 | + * | |
2725 | + * @file: Pointer to "struct file". | |
2726 | + * @cmd: Command number. | |
2727 | + * @arg: Value for @cmd. | |
2728 | + * | |
2729 | + * Returns 0 on success, negative value otherwise. | |
2730 | + */ | |
2731 | +static int __ccs_fcntl_permission(struct file *file, unsigned int cmd, | |
2732 | + unsigned long arg) | |
2733 | +{ | |
2734 | + if (!(cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND))) | |
2735 | + return 0; | |
2736 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) | |
2737 | + return __ccs_open_permission(file->f_path.dentry, file->f_path.mnt, | |
2738 | + O_WRONLY | (arg & O_APPEND)); | |
2739 | +#elif defined(RHEL_MAJOR) && RHEL_MAJOR == 6 | |
2740 | + return __ccs_open_permission(file->f_dentry, file->f_vfsmnt, | |
2741 | + O_WRONLY | (arg & O_APPEND)); | |
2742 | +#else | |
2743 | + return __ccs_open_permission(file->f_dentry, file->f_vfsmnt, | |
2744 | + (O_WRONLY + 1) | (arg & O_APPEND)); | |
2745 | +#endif | |
2746 | +} | |
2747 | + | |
2748 | +/** | |
2749 | + * __ccs_pivot_root_permission - Check permission for pivot_root(). | |
2750 | + * | |
2751 | + * @old_path: Pointer to "struct path". | |
2752 | + * @new_path: Pointer to "struct path". | |
2753 | + * | |
2754 | + * Returns 0 on success, negative value otherwise. | |
2755 | + */ | |
2756 | +static int __ccs_pivot_root_permission(const struct path *old_path, | |
2757 | + const struct path *new_path) | |
2758 | +{ | |
2759 | + return ccs_path2_perm(CCS_TYPE_PIVOT_ROOT, new_path->dentry, | |
2760 | + new_path->mnt, old_path->dentry, old_path->mnt); | |
2761 | +} | |
2762 | + | |
2763 | +/** | |
2764 | + * __ccs_chroot_permission - Check permission for chroot(). | |
2765 | + * | |
2766 | + * @path: Pointer to "struct path". | |
2767 | + * | |
2768 | + * Returns 0 on success, negative value otherwise. | |
2769 | + */ | |
2770 | +static int __ccs_chroot_permission(const struct path *path) | |
2771 | +{ | |
2772 | + return ccs_path_perm(CCS_TYPE_CHROOT, path->dentry, path->mnt, NULL); | |
2773 | +} | |
2774 | + | |
2775 | +/** | |
2776 | + * __ccs_umount_permission - Check permission for unmount. | |
2777 | + * | |
2778 | + * @mnt: Pointer to "struct vfsmount". | |
2779 | + * @flags: Unused. | |
2780 | + * | |
2781 | + * Returns 0 on success, negative value otherwise. | |
2782 | + */ | |
2783 | +static int __ccs_umount_permission(struct vfsmount *mnt, int flags) | |
2784 | +{ | |
2785 | + return ccs_path_perm(CCS_TYPE_UMOUNT, mnt->mnt_root, mnt, NULL); | |
2786 | +} | |
2787 | + | |
2788 | +/** | |
2789 | + * __ccs_mknod_permission - Check permission for vfs_mknod(). | |
2790 | + * | |
2791 | + * @dentry: Pointer to "struct dentry". | |
2792 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2793 | + * @mode: Device type and permission. | |
2794 | + * @dev: Device number for block or character device. | |
2795 | + * | |
2796 | + * Returns 0 on success, negative value otherwise. | |
2797 | + */ | |
2798 | +static int __ccs_mknod_permission(struct dentry *dentry, struct vfsmount *mnt, | |
2799 | + const unsigned int mode, unsigned int dev) | |
2800 | +{ | |
2801 | + int error = 0; | |
2802 | + const unsigned int perm = mode & S_IALLUGO; | |
2803 | + switch (mode & S_IFMT) { | |
2804 | + case S_IFCHR: | |
2805 | + error = ccs_mkdev_perm(CCS_TYPE_MKCHAR, dentry, mnt, perm, | |
2806 | + dev); | |
2807 | + break; | |
2808 | + case S_IFBLK: | |
2809 | + error = ccs_mkdev_perm(CCS_TYPE_MKBLOCK, dentry, mnt, perm, | |
2810 | + dev); | |
2811 | + break; | |
2812 | + case S_IFIFO: | |
2813 | + error = ccs_path_number_perm(CCS_TYPE_MKFIFO, dentry, mnt, | |
2814 | + perm); | |
2815 | + break; | |
2816 | + case S_IFSOCK: | |
2817 | + error = ccs_path_number_perm(CCS_TYPE_MKSOCK, dentry, mnt, | |
2818 | + perm); | |
2819 | + break; | |
2820 | + case 0: | |
2821 | + case S_IFREG: | |
2822 | + error = ccs_path_number_perm(CCS_TYPE_CREATE, dentry, mnt, | |
2823 | + perm); | |
2824 | + break; | |
2825 | + } | |
2826 | + return error; | |
2827 | +} | |
2828 | + | |
2829 | +/** | |
2830 | + * __ccs_mkdir_permission - Check permission for vfs_mkdir(). | |
2831 | + * | |
2832 | + * @dentry: Pointer to "struct dentry". | |
2833 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2834 | + * @mode: Create mode. | |
2835 | + * | |
2836 | + * Returns 0 on success, negative value otherwise. | |
2837 | + */ | |
2838 | +static int __ccs_mkdir_permission(struct dentry *dentry, struct vfsmount *mnt, | |
2839 | + unsigned int mode) | |
2840 | +{ | |
2841 | + return ccs_path_number_perm(CCS_TYPE_MKDIR, dentry, mnt, mode); | |
2842 | +} | |
2843 | + | |
2844 | +/** | |
2845 | + * __ccs_rmdir_permission - Check permission for vfs_rmdir(). | |
2846 | + * | |
2847 | + * @dentry: Pointer to "struct dentry". | |
2848 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2849 | + * | |
2850 | + * Returns 0 on success, negative value otherwise. | |
2851 | + */ | |
2852 | +static int __ccs_rmdir_permission(struct dentry *dentry, struct vfsmount *mnt) | |
2853 | +{ | |
2854 | + return ccs_path_perm(CCS_TYPE_RMDIR, dentry, mnt, NULL); | |
2855 | +} | |
2856 | + | |
2857 | +/** | |
2858 | + * __ccs_unlink_permission - Check permission for vfs_unlink(). | |
2859 | + * | |
2860 | + * @dentry: Pointer to "struct dentry". | |
2861 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2862 | + * | |
2863 | + * Returns 0 on success, negative value otherwise. | |
2864 | + */ | |
2865 | +static int __ccs_unlink_permission(struct dentry *dentry, struct vfsmount *mnt) | |
2866 | +{ | |
2867 | + return ccs_path_perm(CCS_TYPE_UNLINK, dentry, mnt, NULL); | |
2868 | +} | |
2869 | + | |
2870 | +#ifdef CONFIG_CCSECURITY_FILE_GETATTR | |
2871 | + | |
2872 | +/** | |
2873 | + * __ccs_getattr_permission - Check permission for vfs_getattr(). | |
2874 | + * | |
2875 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2876 | + * @dentry: Pointer to "struct dentry". | |
2877 | + * | |
2878 | + * Returns 0 on success, negative value otherwise. | |
2879 | + */ | |
2880 | +static int __ccs_getattr_permission(struct vfsmount *mnt, | |
2881 | + struct dentry *dentry) | |
2882 | +{ | |
2883 | + /* It is not safe to call ccs_get_socket_name(). */ | |
2884 | + if (S_ISSOCK(d_inode(dentry)->i_mode)) | |
2885 | + return 0; | |
2886 | + return ccs_path_perm(CCS_TYPE_GETATTR, dentry, mnt, NULL); | |
2887 | +} | |
2888 | + | |
2889 | +#endif | |
2890 | + | |
2891 | +/** | |
2892 | + * __ccs_symlink_permission - Check permission for vfs_symlink(). | |
2893 | + * | |
2894 | + * @dentry: Pointer to "struct dentry". | |
2895 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2896 | + * @from: Content of symlink. | |
2897 | + * | |
2898 | + * Returns 0 on success, negative value otherwise. | |
2899 | + */ | |
2900 | +static int __ccs_symlink_permission(struct dentry *dentry, | |
2901 | + struct vfsmount *mnt, const char *from) | |
2902 | +{ | |
2903 | + return ccs_path_perm(CCS_TYPE_SYMLINK, dentry, mnt, from); | |
2904 | +} | |
2905 | + | |
2906 | +/** | |
2907 | + * __ccs_truncate_permission - Check permission for notify_change(). | |
2908 | + * | |
2909 | + * @dentry: Pointer to "struct dentry". | |
2910 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2911 | + * | |
2912 | + * Returns 0 on success, negative value otherwise. | |
2913 | + */ | |
2914 | +static int __ccs_truncate_permission(struct dentry *dentry, | |
2915 | + struct vfsmount *mnt) | |
2916 | +{ | |
2917 | + return ccs_path_perm(CCS_TYPE_TRUNCATE, dentry, mnt, NULL); | |
2918 | +} | |
2919 | + | |
2920 | +/** | |
2921 | + * __ccs_rename_permission - Check permission for vfs_rename(). | |
2922 | + * | |
2923 | + * @old_dentry: Pointer to "struct dentry". | |
2924 | + * @new_dentry: Pointer to "struct dentry". | |
2925 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2926 | + * | |
2927 | + * Returns 0 on success, negative value otherwise. | |
2928 | + */ | |
2929 | +static int __ccs_rename_permission(struct dentry *old_dentry, | |
2930 | + struct dentry *new_dentry, | |
2931 | + struct vfsmount *mnt) | |
2932 | +{ | |
2933 | + return ccs_path2_perm(CCS_TYPE_RENAME, old_dentry, mnt, new_dentry, | |
2934 | + mnt); | |
2935 | +} | |
2936 | + | |
2937 | +/** | |
2938 | + * __ccs_link_permission - Check permission for vfs_link(). | |
2939 | + * | |
2940 | + * @old_dentry: Pointer to "struct dentry". | |
2941 | + * @new_dentry: Pointer to "struct dentry". | |
2942 | + * @mnt: Pointer to "struct vfsmount". Maybe NULL. | |
2943 | + * | |
2944 | + * Returns 0 on success, negative value otherwise. | |
2945 | + */ | |
2946 | +static int __ccs_link_permission(struct dentry *old_dentry, | |
2947 | + struct dentry *new_dentry, | |
2948 | + struct vfsmount *mnt) | |
2949 | +{ | |
2950 | + return ccs_path2_perm(CCS_TYPE_LINK, old_dentry, mnt, new_dentry, mnt); | |
2951 | +} | |
2952 | + | |
2953 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30) | |
2954 | + | |
2955 | +/** | |
2956 | + * __ccs_open_exec_permission - Check permission for open_exec(). | |
2957 | + * | |
2958 | + * @dentry: Pointer to "struct dentry". | |
2959 | + * @mnt: Pointer to "struct vfsmount". | |
2960 | + * | |
2961 | + * Returns 0 on success, negative value otherwise. | |
2962 | + */ | |
2963 | +static int __ccs_open_exec_permission(struct dentry *dentry, | |
2964 | + struct vfsmount *mnt) | |
2965 | +{ | |
2966 | + return (ccs_current_flags() & CCS_TASK_IS_IN_EXECVE) ? | |
2967 | + __ccs_open_permission(dentry, mnt, O_RDONLY + 1) : 0; | |
2968 | +} | |
2969 | + | |
2970 | +/** | |
2971 | + * __ccs_uselib_permission - Check permission for sys_uselib(). | |
2972 | + * | |
2973 | + * @dentry: Pointer to "struct dentry". | |
2974 | + * @mnt: Pointer to "struct vfsmount". | |
2975 | + * | |
2976 | + * Returns 0 on success, negative value otherwise. | |
2977 | + */ | |
2978 | +static int __ccs_uselib_permission(struct dentry *dentry, struct vfsmount *mnt) | |
2979 | +{ | |
2980 | + return __ccs_open_permission(dentry, mnt, O_RDONLY + 1); | |
2981 | +} | |
2982 | + | |
2983 | +#endif | |
2984 | + | |
2985 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) || (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 33) && defined(CONFIG_SYSCTL_SYSCALL)) | |
2986 | + | |
2987 | +/** | |
2988 | + * __ccs_parse_table - Check permission for parse_table(). | |
2989 | + * | |
2990 | + * @name: Pointer to "int __user". | |
2991 | + * @nlen: Number of elements in @name. | |
2992 | + * @oldval: Pointer to "void __user". | |
2993 | + * @newval: Pointer to "void __user". | |
2994 | + * @table: Pointer to "struct ctl_table". | |
2995 | + * | |
2996 | + * Returns 0 on success, negative value otherwise. | |
2997 | + * | |
2998 | + * Note that this function is racy because this function checks values in | |
2999 | + * userspace memory which could be changed after permission check. | |
3000 | + */ | |
3001 | +static int __ccs_parse_table(int __user *name, int nlen, void __user *oldval, | |
3002 | + void __user *newval, struct ctl_table *table) | |
3003 | +{ | |
3004 | + int n; | |
3005 | + int error = -ENOMEM; | |
3006 | + int op = 0; | |
3007 | + struct ccs_path_info buf; | |
3008 | + char *buffer = NULL; | |
3009 | + struct ccs_request_info r; | |
3010 | + int idx; | |
3011 | + if (oldval) | |
3012 | + op |= 004; | |
3013 | + if (newval) | |
3014 | + op |= 002; | |
3015 | + if (!op) /* Neither read nor write */ | |
3016 | + return 0; | |
3017 | + idx = ccs_read_lock(); | |
3018 | + if (ccs_init_request_info(&r, CCS_MAC_FILE_OPEN) | |
3019 | + == CCS_CONFIG_DISABLED) { | |
3020 | + error = 0; | |
3021 | + goto out; | |
3022 | + } | |
3023 | + buffer = kmalloc(PAGE_SIZE, CCS_GFP_FLAGS); | |
3024 | + if (!buffer) | |
3025 | + goto out; | |
3026 | + snprintf(buffer, PAGE_SIZE - 1, "proc:/sys"); | |
3027 | +repeat: | |
3028 | + if (!nlen) { | |
3029 | + error = -ENOTDIR; | |
3030 | + goto out; | |
3031 | + } | |
3032 | + if (get_user(n, name)) { | |
3033 | + error = -EFAULT; | |
3034 | + goto out; | |
3035 | + } | |
3036 | + for ( ; table->ctl_name | |
3037 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) | |
3038 | + || table->procname | |
3039 | +#endif | |
3040 | + ; table++) { | |
3041 | + int pos; | |
3042 | + const char *cp; | |
3043 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 21) | |
3044 | + if (n != table->ctl_name && table->ctl_name != CTL_ANY) | |
3045 | + continue; | |
3046 | +#else | |
3047 | + if (!n || n != table->ctl_name) | |
3048 | + continue; | |
3049 | +#endif | |
3050 | + pos = strlen(buffer); | |
3051 | + cp = table->procname; | |
3052 | + error = -ENOMEM; | |
3053 | + if (cp) { | |
3054 | + int len = strlen(cp); | |
3055 | + if (len + 2 > PAGE_SIZE - 1) | |
3056 | + goto out; | |
3057 | + buffer[pos++] = '/'; | |
3058 | + memmove(buffer + pos, cp, len + 1); | |
3059 | + } else { | |
3060 | + /* Assume nobody assigns "=\$=" for procname. */ | |
3061 | + snprintf(buffer + pos, PAGE_SIZE - pos - 1, | |
3062 | + "/=%d=", table->ctl_name); | |
3063 | + if (!memchr(buffer, '\0', PAGE_SIZE - 2)) | |
3064 | + goto out; | |
3065 | + } | |
3066 | + if (!table->child) | |
3067 | + goto no_child; | |
3068 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 21) | |
3069 | + if (!table->strategy) | |
3070 | + goto no_strategy; | |
3071 | + /* printk("sysctl='%s'\n", buffer); */ | |
3072 | + buf.name = ccs_encode(buffer); | |
3073 | + if (!buf.name) | |
3074 | + goto out; | |
3075 | + ccs_fill_path_info(&buf); | |
3076 | + if (op & MAY_READ) | |
3077 | + error = ccs_path_permission(&r, CCS_TYPE_READ, &buf); | |
3078 | + else | |
3079 | + error = 0; | |
3080 | + if (!error && (op & MAY_WRITE)) | |
3081 | + error = ccs_path_permission(&r, CCS_TYPE_WRITE, &buf); | |
3082 | + kfree(buf.name); | |
3083 | + if (error) | |
3084 | + goto out; | |
3085 | +no_strategy: | |
3086 | +#endif | |
3087 | + name++; | |
3088 | + nlen--; | |
3089 | + table = table->child; | |
3090 | + goto repeat; | |
3091 | +no_child: | |
3092 | + /* printk("sysctl='%s'\n", buffer); */ | |
3093 | + buf.name = ccs_encode(buffer); | |
3094 | + if (!buf.name) | |
3095 | + goto out; | |
3096 | + ccs_fill_path_info(&buf); | |
3097 | + if (op & MAY_READ) | |
3098 | + error = ccs_path_permission(&r, CCS_TYPE_READ, &buf); | |
3099 | + else | |
3100 | + error = 0; | |
3101 | + if (!error && (op & MAY_WRITE)) | |
3102 | + error = ccs_path_permission(&r, CCS_TYPE_WRITE, &buf); | |
3103 | + kfree(buf.name); | |
3104 | + goto out; | |
3105 | + } | |
3106 | + error = -ENOTDIR; | |
3107 | +out: | |
3108 | + ccs_read_unlock(idx); | |
3109 | + kfree(buffer); | |
3110 | + return error; | |
3111 | +} | |
3112 | + | |
3113 | +#endif | |
3114 | + | |
3115 | +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24) | |
3116 | + | |
3117 | +/** | |
3118 | + * ccs_old_pivot_root_permission - Check permission for pivot_root(). | |
3119 | + * | |
3120 | + * @old_nd: Pointer to "struct nameidata". | |
3121 | + * @new_nd: Pointer to "struct nameidata". | |
3122 | + * | |
3123 | + * Returns 0 on success, negative value otherwise. | |
3124 | + */ | |
3125 | +static int ccs_old_pivot_root_permission(struct nameidata *old_nd, | |
3126 | + struct nameidata *new_nd) | |
3127 | +{ | |
3128 | + struct path old_path = { old_nd->mnt, old_nd->dentry }; | |
3129 | + struct path new_path = { new_nd->mnt, new_nd->dentry }; | |
3130 | + return __ccs_pivot_root_permission(&old_path, &new_path); | |
3131 | +} | |
3132 | + | |
3133 | +/** | |
3134 | + * ccs_old_chroot_permission - Check permission for chroot(). | |
3135 | + * | |
3136 | + * @nd: Pointer to "struct nameidata". | |
3137 | + * | |
3138 | + * Returns 0 on success, negative value otherwise. | |
3139 | + */ | |
3140 | +static int ccs_old_chroot_permission(struct nameidata *nd) | |
3141 | +{ | |
3142 | + struct path path = { nd->mnt, nd->dentry }; | |
3143 | + return __ccs_chroot_permission(&path); | |
3144 | +} | |
3145 | + | |
3146 | +#endif | |
3147 | + | |
3148 | +#ifdef CONFIG_CCSECURITY_NETWORK | |
3149 | + | |
3150 | +/** | |
3151 | + * ccs_address_matches_group - Check whether the given address matches members of the given address group. | |
3152 | + * | |
3153 | + * @is_ipv6: True if @address is an IPv6 address. | |
3154 | + * @address: An IPv4 or IPv6 address. | |
3155 | + * @group: Pointer to "struct ccs_address_group". | |
3156 | + * | |
3157 | + * Returns true if @address matches addresses in @group group, false otherwise. | |
3158 | + * | |
3159 | + * Caller holds ccs_read_lock(). | |
3160 | + */ | |
3161 | +static bool ccs_address_matches_group(const bool is_ipv6, const u32 *address, | |
3162 | + const struct ccs_group *group) | |
3163 | +{ | |
3164 | + struct ccs_address_group *member; | |
3165 | + bool matched = false; | |
3166 | + const u8 size = is_ipv6 ? 16 : 4; | |
3167 | + list_for_each_entry_srcu(member, &group->member_list, head.list, | |
3168 | + &ccs_ss) { | |
3169 | + if (member->head.is_deleted) | |
3170 | + continue; | |
3171 | + if (member->address.is_ipv6 != is_ipv6) | |
3172 | + continue; | |
3173 | + if (memcmp(&member->address.ip[0], address, size) > 0 || | |
3174 | + memcmp(address, &member->address.ip[1], size) > 0) | |
3175 | + continue; | |
3176 | + matched = true; | |
3177 | + break; | |
3178 | + } | |
3179 | + return matched; | |
3180 | +} | |
3181 | + | |
3182 | +/** | |
3183 | + * ccs_check_inet_acl - Check permission for inet domain socket operation. | |
3184 | + * | |
3185 | + * @r: Pointer to "struct ccs_request_info". | |
3186 | + * @ptr: Pointer to "struct ccs_acl_info". | |
3187 | + * | |
3188 | + * Returns true if granted, false otherwise. | |
3189 | + */ | |
3190 | +static bool ccs_check_inet_acl(struct ccs_request_info *r, | |
3191 | + const struct ccs_acl_info *ptr) | |
3192 | +{ | |
3193 | + const struct ccs_inet_acl *acl = container_of(ptr, typeof(*acl), head); | |
3194 | + const u8 size = r->param.inet_network.is_ipv6 ? 16 : 4; | |
3195 | + if (!(ptr->perm & (1 << r->param.inet_network.operation)) || | |
3196 | + !ccs_compare_number_union(r->param.inet_network.port, &acl->port)) | |
3197 | + return false; | |
3198 | + if (acl->address.group) | |
3199 | + return ccs_address_matches_group(r->param.inet_network.is_ipv6, | |
3200 | + r->param.inet_network.address, | |
3201 | + acl->address.group); | |
3202 | + return acl->address.is_ipv6 == r->param.inet_network.is_ipv6 && | |
3203 | + memcmp(&acl->address.ip[0], | |
3204 | + r->param.inet_network.address, size) <= 0 && | |
3205 | + memcmp(r->param.inet_network.address, | |
3206 | + &acl->address.ip[1], size) <= 0; | |
3207 | +} | |
3208 | + | |
3209 | +/** | |
3210 | + * ccs_check_unix_acl - Check permission for unix domain socket operation. | |
3211 | + * | |
3212 | + * @r: Pointer to "struct ccs_request_info". | |
3213 | + * @ptr: Pointer to "struct ccs_acl_info". | |
3214 | + * | |
3215 | + * Returns true if granted, false otherwise. | |
3216 | + */ | |
3217 | +static bool ccs_check_unix_acl(struct ccs_request_info *r, | |
3218 | + const struct ccs_acl_info *ptr) | |
3219 | +{ | |
3220 | + const struct ccs_unix_acl *acl = container_of(ptr, typeof(*acl), head); | |
3221 | + return (ptr->perm & (1 << r->param.unix_network.operation)) && | |
3222 | + ccs_compare_name_union(r->param.unix_network.address, | |
3223 | + &acl->name); | |
3224 | +} | |
3225 | + | |
3226 | +/** | |
3227 | + * ccs_inet_entry - Check permission for INET network operation. | |
3228 | + * | |
3229 | + * @address: Pointer to "struct ccs_addr_info". | |
3230 | + * | |
3231 | + * Returns 0 on success, negative value otherwise. | |
3232 | + */ | |
3233 | +static int ccs_inet_entry(const struct ccs_addr_info *address) | |
3234 | +{ | |
3235 | + const int idx = ccs_read_lock(); | |
3236 | + struct ccs_request_info r; | |
3237 | + int error = 0; | |
3238 | + const u8 type = ccs_inet2mac[address->protocol][address->operation]; | |
3239 | + if (type && ccs_init_request_info(&r, type) != CCS_CONFIG_DISABLED) { | |
3240 | + r.param_type = CCS_TYPE_INET_ACL; | |
3241 | + r.param.inet_network.protocol = address->protocol; | |
3242 | + r.param.inet_network.operation = address->operation; | |
3243 | + r.param.inet_network.is_ipv6 = address->inet.is_ipv6; | |
3244 | + r.param.inet_network.address = address->inet.address; | |
3245 | + r.param.inet_network.port = ntohs(address->inet.port); | |
3246 | + r.dont_sleep_on_enforce_error = | |
3247 | + address->operation == CCS_NETWORK_ACCEPT | |
3248 | +#ifdef CONFIG_CCSECURITY_NETWORK_RECVMSG | |
3249 | + || address->operation == CCS_NETWORK_RECV | |
3250 | +#endif | |
3251 | + ; | |
3252 | + error = ccs_check_acl(&r); | |
3253 | + } | |
3254 | + ccs_read_unlock(idx); | |
3255 | + return error; | |
3256 | +} | |
3257 | + | |
3258 | +/** | |
3259 | + * ccs_check_inet_address - Check permission for inet domain socket's operation. | |
3260 | + * | |
3261 | + * @addr: Pointer to "struct sockaddr". | |
3262 | + * @addr_len: Size of @addr. | |
3263 | + * @port: Port number. | |
3264 | + * @address: Pointer to "struct ccs_addr_info". | |
3265 | + * | |
3266 | + * Returns 0 on success, negative value otherwise. | |
3267 | + */ | |
3268 | +static int ccs_check_inet_address(const struct sockaddr *addr, | |
3269 | + const unsigned int addr_len, const u16 port, | |
3270 | + struct ccs_addr_info *address) | |
3271 | +{ | |
3272 | + struct ccs_inet_addr_info *i = &address->inet; | |
3273 | + if (addr_len < sizeof(addr->sa_family)) | |
3274 | + goto skip; | |
3275 | + switch (addr->sa_family) { | |
3276 | + case AF_INET6: | |
3277 | + if (addr_len < SIN6_LEN_RFC2133) | |
3278 | + goto skip; | |
3279 | + i->is_ipv6 = true; | |
3280 | + i->address = (u32 *) | |
3281 | + ((struct sockaddr_in6 *) addr)->sin6_addr.s6_addr; | |
3282 | + i->port = ((struct sockaddr_in6 *) addr)->sin6_port; | |
3283 | + break; | |
3284 | + case AF_INET: | |
3285 | + if (addr_len < sizeof(struct sockaddr_in)) | |
3286 | + goto skip; | |
3287 | + i->is_ipv6 = false; | |
3288 | + i->address = (u32 *) &((struct sockaddr_in *) addr)->sin_addr; | |
3289 | + i->port = ((struct sockaddr_in *) addr)->sin_port; | |
3290 | + break; | |
3291 | + default: | |
3292 | + goto skip; | |
3293 | + } | |
3294 | + if (address->protocol == SOCK_RAW) | |
3295 | + i->port = htons(port); | |
3296 | + return ccs_inet_entry(address); | |
3297 | +skip: | |
3298 | + return 0; | |
3299 | +} | |
3300 | + | |
3301 | +/** | |
3302 | + * ccs_unix_entry - Check permission for UNIX network operation. | |
3303 | + * | |
3304 | + * @address: Pointer to "struct ccs_addr_info". | |
3305 | + * | |
3306 | + * Returns 0 on success, negative value otherwise. | |
3307 | + */ | |
3308 | +static int ccs_unix_entry(const struct ccs_addr_info *address) | |
3309 | +{ | |
3310 | + const int idx = ccs_read_lock(); | |
3311 | + struct ccs_request_info r; | |
3312 | + int error = 0; | |
3313 | + const u8 type = ccs_unix2mac[address->protocol][address->operation]; | |
3314 | + if (type && ccs_init_request_info(&r, type) != CCS_CONFIG_DISABLED) { | |
3315 | + char |
差分はサイズ制限により省略されました。全ての差分を見るためにはローカルクライアントを利用してください。