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Commit | Line | Data |
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b5e95b48 JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor LSM hooks. | |
5 | * | |
6 | * Copyright (C) 1998-2008 Novell/SUSE | |
7 | * Copyright 2009-2010 Canonical Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation, version 2 of the | |
12 | * License. | |
13 | */ | |
14 | ||
3c4ed7bd | 15 | #include <linux/lsm_hooks.h> |
b5e95b48 JJ |
16 | #include <linux/moduleparam.h> |
17 | #include <linux/mm.h> | |
18 | #include <linux/mman.h> | |
19 | #include <linux/mount.h> | |
20 | #include <linux/namei.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/ctype.h> | |
23 | #include <linux/sysctl.h> | |
24 | #include <linux/audit.h> | |
3486740a | 25 | #include <linux/user_namespace.h> |
e025be0f | 26 | #include <linux/kmemleak.h> |
b5e95b48 JJ |
27 | #include <net/sock.h> |
28 | ||
29 | #include "include/apparmor.h" | |
30 | #include "include/apparmorfs.h" | |
31 | #include "include/audit.h" | |
32 | #include "include/capability.h" | |
33 | #include "include/context.h" | |
34 | #include "include/file.h" | |
35 | #include "include/ipc.h" | |
36 | #include "include/path.h" | |
37 | #include "include/policy.h" | |
cff281f6 | 38 | #include "include/policy_ns.h" |
b5e95b48 JJ |
39 | #include "include/procattr.h" |
40 | ||
41 | /* Flag indicating whether initialization completed */ | |
545de8fe | 42 | int apparmor_initialized; |
b5e95b48 | 43 | |
d4669f0b JJ |
44 | DEFINE_PER_CPU(struct aa_buffers, aa_buffers); |
45 | ||
46 | ||
b5e95b48 JJ |
47 | /* |
48 | * LSM hook functions | |
49 | */ | |
50 | ||
51 | /* | |
55a26ebf | 52 | * free the associated aa_task_ctx and put its profiles |
b5e95b48 JJ |
53 | */ |
54 | static void apparmor_cred_free(struct cred *cred) | |
55 | { | |
55a26ebf JJ |
56 | aa_free_task_context(cred_ctx(cred)); |
57 | cred_ctx(cred) = NULL; | |
b5e95b48 JJ |
58 | } |
59 | ||
60 | /* | |
61 | * allocate the apparmor part of blank credentials | |
62 | */ | |
63 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
64 | { | |
65 | /* freed by apparmor_cred_free */ | |
55a26ebf JJ |
66 | struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); |
67 | ||
68 | if (!ctx) | |
b5e95b48 JJ |
69 | return -ENOMEM; |
70 | ||
55a26ebf | 71 | cred_ctx(cred) = ctx; |
b5e95b48 JJ |
72 | return 0; |
73 | } | |
74 | ||
75 | /* | |
55a26ebf | 76 | * prepare new aa_task_ctx for modification by prepare_cred block |
b5e95b48 JJ |
77 | */ |
78 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
79 | gfp_t gfp) | |
80 | { | |
81 | /* freed by apparmor_cred_free */ | |
55a26ebf JJ |
82 | struct aa_task_ctx *ctx = aa_alloc_task_context(gfp); |
83 | ||
84 | if (!ctx) | |
b5e95b48 JJ |
85 | return -ENOMEM; |
86 | ||
55a26ebf JJ |
87 | aa_dup_task_context(ctx, cred_ctx(old)); |
88 | cred_ctx(new) = ctx; | |
b5e95b48 JJ |
89 | return 0; |
90 | } | |
91 | ||
92 | /* | |
93 | * transfer the apparmor data to a blank set of creds | |
94 | */ | |
95 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
96 | { | |
55a26ebf JJ |
97 | const struct aa_task_ctx *old_ctx = cred_ctx(old); |
98 | struct aa_task_ctx *new_ctx = cred_ctx(new); | |
b5e95b48 | 99 | |
55a26ebf | 100 | aa_dup_task_context(new_ctx, old_ctx); |
b5e95b48 JJ |
101 | } |
102 | ||
103 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
104 | unsigned int mode) | |
105 | { | |
b5e95b48 JJ |
106 | return aa_ptrace(current, child, mode); |
107 | } | |
108 | ||
109 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
110 | { | |
b5e95b48 JJ |
111 | return aa_ptrace(parent, current, PTRACE_MODE_ATTACH); |
112 | } | |
113 | ||
114 | /* Derived from security/commoncap.c:cap_capget */ | |
115 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
116 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
117 | { | |
118 | struct aa_profile *profile; | |
119 | const struct cred *cred; | |
120 | ||
121 | rcu_read_lock(); | |
122 | cred = __task_cred(target); | |
cf797c0e | 123 | profile = aa_get_newest_cred_profile(cred); |
b5e95b48 | 124 | |
b1d9e6b0 CS |
125 | /* |
126 | * cap_capget is stacked ahead of this and will | |
127 | * initialize effective and permitted. | |
128 | */ | |
25e75dff | 129 | if (!unconfined(profile) && !COMPLAIN_MODE(profile)) { |
b5e95b48 JJ |
130 | *effective = cap_intersect(*effective, profile->caps.allow); |
131 | *permitted = cap_intersect(*permitted, profile->caps.allow); | |
132 | } | |
133 | rcu_read_unlock(); | |
cf797c0e | 134 | aa_put_profile(profile); |
b5e95b48 JJ |
135 | |
136 | return 0; | |
137 | } | |
138 | ||
6a9de491 EP |
139 | static int apparmor_capable(const struct cred *cred, struct user_namespace *ns, |
140 | int cap, int audit) | |
b5e95b48 JJ |
141 | { |
142 | struct aa_profile *profile; | |
b1d9e6b0 CS |
143 | int error = 0; |
144 | ||
cf797c0e | 145 | profile = aa_get_newest_cred_profile(cred); |
b1d9e6b0 CS |
146 | if (!unconfined(profile)) |
147 | error = aa_capable(profile, cap, audit); | |
cf797c0e JJ |
148 | aa_put_profile(profile); |
149 | ||
b5e95b48 JJ |
150 | return error; |
151 | } | |
152 | ||
153 | /** | |
154 | * common_perm - basic common permission check wrapper fn for paths | |
155 | * @op: operation being checked | |
156 | * @path: path to check permission of (NOT NULL) | |
157 | * @mask: requested permissions mask | |
158 | * @cond: conditional info for the permission request (NOT NULL) | |
159 | * | |
160 | * Returns: %0 else error code if error or permission denied | |
161 | */ | |
47f6e5cc | 162 | static int common_perm(const char *op, const struct path *path, u32 mask, |
b5e95b48 JJ |
163 | struct path_cond *cond) |
164 | { | |
165 | struct aa_profile *profile; | |
166 | int error = 0; | |
167 | ||
cf797c0e | 168 | profile = __begin_current_profile_crit_section(); |
b5e95b48 JJ |
169 | if (!unconfined(profile)) |
170 | error = aa_path_perm(op, profile, path, 0, mask, cond); | |
cf797c0e | 171 | __end_current_profile_crit_section(profile); |
b5e95b48 JJ |
172 | |
173 | return error; | |
174 | } | |
175 | ||
176 | /** | |
31f75bfe | 177 | * common_perm_cond - common permission wrapper around inode cond |
b5e95b48 | 178 | * @op: operation being checked |
31f75bfe | 179 | * @path: location to check (NOT NULL) |
b5e95b48 | 180 | * @mask: requested permissions mask |
b5e95b48 JJ |
181 | * |
182 | * Returns: %0 else error code if error or permission denied | |
183 | */ | |
31f75bfe | 184 | static int common_perm_cond(const char *op, const struct path *path, u32 mask) |
b5e95b48 | 185 | { |
31f75bfe JJ |
186 | struct path_cond cond = { d_backing_inode(path->dentry)->i_uid, |
187 | d_backing_inode(path->dentry)->i_mode | |
188 | }; | |
b5e95b48 | 189 | |
31f75bfe JJ |
190 | if (!path_mediated_fs(path->dentry)) |
191 | return 0; | |
192 | ||
193 | return common_perm(op, path, mask, &cond); | |
b5e95b48 JJ |
194 | } |
195 | ||
196 | /** | |
31f75bfe | 197 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry |
b5e95b48 | 198 | * @op: operation being checked |
31f75bfe JJ |
199 | * @dir: directory of the dentry (NOT NULL) |
200 | * @dentry: dentry to check (NOT NULL) | |
b5e95b48 | 201 | * @mask: requested permissions mask |
31f75bfe | 202 | * @cond: conditional info for the permission request (NOT NULL) |
b5e95b48 JJ |
203 | * |
204 | * Returns: %0 else error code if error or permission denied | |
205 | */ | |
31f75bfe JJ |
206 | static int common_perm_dir_dentry(const char *op, const struct path *dir, |
207 | struct dentry *dentry, u32 mask, | |
208 | struct path_cond *cond) | |
b5e95b48 | 209 | { |
31f75bfe | 210 | struct path path = { .mnt = dir->mnt, .dentry = dentry }; |
b5e95b48 | 211 | |
31f75bfe | 212 | return common_perm(op, &path, mask, cond); |
b5e95b48 JJ |
213 | } |
214 | ||
215 | /** | |
216 | * common_perm_rm - common permission wrapper for operations doing rm | |
217 | * @op: operation being checked | |
218 | * @dir: directory that the dentry is in (NOT NULL) | |
219 | * @dentry: dentry being rm'd (NOT NULL) | |
220 | * @mask: requested permission mask | |
221 | * | |
222 | * Returns: %0 else error code if error or permission denied | |
223 | */ | |
47f6e5cc | 224 | static int common_perm_rm(const char *op, const struct path *dir, |
b5e95b48 JJ |
225 | struct dentry *dentry, u32 mask) |
226 | { | |
c6f493d6 | 227 | struct inode *inode = d_backing_inode(dentry); |
b5e95b48 JJ |
228 | struct path_cond cond = { }; |
229 | ||
efeee83a | 230 | if (!inode || !path_mediated_fs(dentry)) |
b5e95b48 JJ |
231 | return 0; |
232 | ||
233 | cond.uid = inode->i_uid; | |
234 | cond.mode = inode->i_mode; | |
235 | ||
236 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
237 | } | |
238 | ||
239 | /** | |
240 | * common_perm_create - common permission wrapper for operations doing create | |
241 | * @op: operation being checked | |
242 | * @dir: directory that dentry will be created in (NOT NULL) | |
243 | * @dentry: dentry to create (NOT NULL) | |
244 | * @mask: request permission mask | |
245 | * @mode: created file mode | |
246 | * | |
247 | * Returns: %0 else error code if error or permission denied | |
248 | */ | |
47f6e5cc | 249 | static int common_perm_create(const char *op, const struct path *dir, |
d6b49f7a | 250 | struct dentry *dentry, u32 mask, umode_t mode) |
b5e95b48 JJ |
251 | { |
252 | struct path_cond cond = { current_fsuid(), mode }; | |
253 | ||
efeee83a | 254 | if (!path_mediated_fs(dir->dentry)) |
b5e95b48 JJ |
255 | return 0; |
256 | ||
257 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
258 | } | |
259 | ||
989f74e0 | 260 | static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
261 | { |
262 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
263 | } | |
264 | ||
d3607752 | 265 | static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry, |
4572befe | 266 | umode_t mode) |
b5e95b48 JJ |
267 | { |
268 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
269 | S_IFDIR); | |
270 | } | |
271 | ||
989f74e0 | 272 | static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry) |
b5e95b48 JJ |
273 | { |
274 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
275 | } | |
276 | ||
d3607752 | 277 | static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry, |
04fc66e7 | 278 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
279 | { |
280 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
281 | } | |
282 | ||
81f4c506 | 283 | static int apparmor_path_truncate(const struct path *path) |
b5e95b48 | 284 | { |
e53cfe6c | 285 | return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR); |
b5e95b48 JJ |
286 | } |
287 | ||
d3607752 | 288 | static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry, |
b5e95b48 JJ |
289 | const char *old_name) |
290 | { | |
291 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
292 | S_IFLNK); | |
293 | } | |
294 | ||
3ccee46a | 295 | static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir, |
b5e95b48 JJ |
296 | struct dentry *new_dentry) |
297 | { | |
298 | struct aa_profile *profile; | |
299 | int error = 0; | |
300 | ||
efeee83a | 301 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
302 | return 0; |
303 | ||
cf797c0e | 304 | profile = begin_current_profile_crit_section(); |
b5e95b48 JJ |
305 | if (!unconfined(profile)) |
306 | error = aa_path_link(profile, old_dentry, new_dir, new_dentry); | |
cf797c0e JJ |
307 | end_current_profile_crit_section(profile); |
308 | ||
b5e95b48 JJ |
309 | return error; |
310 | } | |
311 | ||
3ccee46a AV |
312 | static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
313 | const struct path *new_dir, struct dentry *new_dentry) | |
b5e95b48 JJ |
314 | { |
315 | struct aa_profile *profile; | |
316 | int error = 0; | |
317 | ||
efeee83a | 318 | if (!path_mediated_fs(old_dentry)) |
b5e95b48 JJ |
319 | return 0; |
320 | ||
cf797c0e | 321 | profile = begin_current_profile_crit_section(); |
b5e95b48 | 322 | if (!unconfined(profile)) { |
8486adf0 KC |
323 | struct path old_path = { .mnt = old_dir->mnt, |
324 | .dentry = old_dentry }; | |
325 | struct path new_path = { .mnt = new_dir->mnt, | |
326 | .dentry = new_dentry }; | |
c6f493d6 DH |
327 | struct path_cond cond = { d_backing_inode(old_dentry)->i_uid, |
328 | d_backing_inode(old_dentry)->i_mode | |
b5e95b48 JJ |
329 | }; |
330 | ||
331 | error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0, | |
e53cfe6c JJ |
332 | MAY_READ | AA_MAY_GETATTR | MAY_WRITE | |
333 | AA_MAY_SETATTR | AA_MAY_DELETE, | |
b5e95b48 JJ |
334 | &cond); |
335 | if (!error) | |
336 | error = aa_path_perm(OP_RENAME_DEST, profile, &new_path, | |
e53cfe6c | 337 | 0, MAY_WRITE | AA_MAY_SETATTR | |
b5e95b48 JJ |
338 | AA_MAY_CREATE, &cond); |
339 | ||
340 | } | |
cf797c0e JJ |
341 | end_current_profile_crit_section(profile); |
342 | ||
b5e95b48 JJ |
343 | return error; |
344 | } | |
345 | ||
be01f9f2 | 346 | static int apparmor_path_chmod(const struct path *path, umode_t mode) |
b5e95b48 | 347 | { |
31f75bfe | 348 | return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD); |
b5e95b48 JJ |
349 | } |
350 | ||
7fd25dac | 351 | static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
b5e95b48 | 352 | { |
31f75bfe | 353 | return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN); |
b5e95b48 JJ |
354 | } |
355 | ||
3f7036a0 | 356 | static int apparmor_inode_getattr(const struct path *path) |
b5e95b48 | 357 | { |
e53cfe6c | 358 | return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR); |
b5e95b48 JJ |
359 | } |
360 | ||
83d49856 | 361 | static int apparmor_file_open(struct file *file, const struct cred *cred) |
b5e95b48 | 362 | { |
55a26ebf | 363 | struct aa_file_ctx *fctx = file->f_security; |
b5e95b48 JJ |
364 | struct aa_profile *profile; |
365 | int error = 0; | |
366 | ||
efeee83a | 367 | if (!path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
368 | return 0; |
369 | ||
370 | /* If in exec, permission is handled by bprm hooks. | |
371 | * Cache permissions granted by the previous exec check, with | |
372 | * implicit read and executable mmap which are required to | |
373 | * actually execute the image. | |
374 | */ | |
375 | if (current->in_execve) { | |
55a26ebf | 376 | fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; |
b5e95b48 JJ |
377 | return 0; |
378 | } | |
379 | ||
cf797c0e | 380 | profile = aa_get_newest_cred_profile(cred); |
b5e95b48 | 381 | if (!unconfined(profile)) { |
496ad9aa | 382 | struct inode *inode = file_inode(file); |
b5e95b48 JJ |
383 | struct path_cond cond = { inode->i_uid, inode->i_mode }; |
384 | ||
385 | error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0, | |
386 | aa_map_file_to_perms(file), &cond); | |
387 | /* todo cache full allowed permissions set and state */ | |
55a26ebf | 388 | fctx->allow = aa_map_file_to_perms(file); |
b5e95b48 | 389 | } |
cf797c0e | 390 | aa_put_profile(profile); |
b5e95b48 JJ |
391 | |
392 | return error; | |
393 | } | |
394 | ||
395 | static int apparmor_file_alloc_security(struct file *file) | |
396 | { | |
cf797c0e JJ |
397 | int error = 0; |
398 | ||
b5e95b48 | 399 | /* freed by apparmor_file_free_security */ |
cf797c0e | 400 | struct aa_profile *profile = begin_current_profile_crit_section(); |
b5e95b48 JJ |
401 | file->f_security = aa_alloc_file_context(GFP_KERNEL); |
402 | if (!file->f_security) | |
403 | return -ENOMEM; | |
cf797c0e | 404 | end_current_profile_crit_section(profile); |
b5e95b48 | 405 | |
cf797c0e | 406 | return error; |
b5e95b48 JJ |
407 | } |
408 | ||
409 | static void apparmor_file_free_security(struct file *file) | |
410 | { | |
55a26ebf | 411 | struct aa_file_ctx *ctx = file->f_security; |
b5e95b48 | 412 | |
55a26ebf | 413 | aa_free_file_context(ctx); |
b5e95b48 JJ |
414 | } |
415 | ||
47f6e5cc | 416 | static int common_file_perm(const char *op, struct file *file, u32 mask) |
b5e95b48 | 417 | { |
55a26ebf | 418 | struct aa_file_ctx *fctx = file->f_security; |
cf797c0e | 419 | struct aa_profile *profile, *fprofile; |
b5e95b48 JJ |
420 | int error = 0; |
421 | ||
cf797c0e | 422 | fprofile = aa_cred_raw_profile(file->f_cred); |
e6bfa25d | 423 | AA_BUG(!fprofile); |
b5e95b48 JJ |
424 | |
425 | if (!file->f_path.mnt || | |
efeee83a | 426 | !path_mediated_fs(file->f_path.dentry)) |
b5e95b48 JJ |
427 | return 0; |
428 | ||
cf797c0e | 429 | profile = __begin_current_profile_crit_section(); |
b5e95b48 JJ |
430 | |
431 | /* revalidate access, if task is unconfined, or the cached cred | |
432 | * doesn't match or if the request is for more permissions than | |
433 | * was granted. | |
434 | * | |
435 | * Note: the test for !unconfined(fprofile) is to handle file | |
436 | * delegation from unconfined tasks | |
437 | */ | |
438 | if (!unconfined(profile) && !unconfined(fprofile) && | |
55a26ebf | 439 | ((fprofile != profile) || (mask & ~fctx->allow))) |
b5e95b48 | 440 | error = aa_file_perm(op, profile, file, mask); |
cf797c0e | 441 | __end_current_profile_crit_section(profile); |
b5e95b48 JJ |
442 | |
443 | return error; | |
444 | } | |
445 | ||
446 | static int apparmor_file_permission(struct file *file, int mask) | |
447 | { | |
448 | return common_file_perm(OP_FPERM, file, mask); | |
449 | } | |
450 | ||
451 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
452 | { | |
453 | u32 mask = AA_MAY_LOCK; | |
454 | ||
455 | if (cmd == F_WRLCK) | |
456 | mask |= MAY_WRITE; | |
457 | ||
458 | return common_file_perm(OP_FLOCK, file, mask); | |
459 | } | |
460 | ||
47f6e5cc | 461 | static int common_mmap(const char *op, struct file *file, unsigned long prot, |
b5e95b48 JJ |
462 | unsigned long flags) |
463 | { | |
b5e95b48 JJ |
464 | int mask = 0; |
465 | ||
466 | if (!file || !file->f_security) | |
467 | return 0; | |
468 | ||
469 | if (prot & PROT_READ) | |
470 | mask |= MAY_READ; | |
471 | /* | |
472 | * Private mappings don't require write perms since they don't | |
473 | * write back to the files | |
474 | */ | |
475 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
476 | mask |= MAY_WRITE; | |
477 | if (prot & PROT_EXEC) | |
478 | mask |= AA_EXEC_MMAP; | |
479 | ||
b5e95b48 JJ |
480 | return common_file_perm(op, file, mask); |
481 | } | |
482 | ||
e5467859 AV |
483 | static int apparmor_mmap_file(struct file *file, unsigned long reqprot, |
484 | unsigned long prot, unsigned long flags) | |
b5e95b48 | 485 | { |
b5e95b48 JJ |
486 | return common_mmap(OP_FMMAP, file, prot, flags); |
487 | } | |
488 | ||
489 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
490 | unsigned long reqprot, unsigned long prot) | |
491 | { | |
492 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
493 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
494 | } | |
495 | ||
496 | static int apparmor_getprocattr(struct task_struct *task, char *name, | |
497 | char **value) | |
498 | { | |
499 | int error = -ENOENT; | |
b5e95b48 JJ |
500 | /* released below */ |
501 | const struct cred *cred = get_task_cred(task); | |
55a26ebf | 502 | struct aa_task_ctx *ctx = cred_ctx(cred); |
77b071b3 | 503 | struct aa_profile *profile = NULL; |
b5e95b48 JJ |
504 | |
505 | if (strcmp(name, "current") == 0) | |
55a26ebf JJ |
506 | profile = aa_get_newest_profile(ctx->profile); |
507 | else if (strcmp(name, "prev") == 0 && ctx->previous) | |
508 | profile = aa_get_newest_profile(ctx->previous); | |
509 | else if (strcmp(name, "exec") == 0 && ctx->onexec) | |
510 | profile = aa_get_newest_profile(ctx->onexec); | |
b5e95b48 JJ |
511 | else |
512 | error = -EINVAL; | |
513 | ||
77b071b3 JJ |
514 | if (profile) |
515 | error = aa_getprocattr(profile, value); | |
516 | ||
517 | aa_put_profile(profile); | |
b5e95b48 JJ |
518 | put_cred(cred); |
519 | ||
520 | return error; | |
521 | } | |
522 | ||
b21507e2 SS |
523 | static int apparmor_setprocattr(const char *name, void *value, |
524 | size_t size) | |
b5e95b48 | 525 | { |
e89b8081 | 526 | char *command, *largs = NULL, *args = value; |
b5e95b48 JJ |
527 | size_t arg_size; |
528 | int error; | |
ef88a7ac | 529 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR); |
b5e95b48 JJ |
530 | |
531 | if (size == 0) | |
532 | return -EINVAL; | |
b5e95b48 | 533 | |
e89b8081 VN |
534 | /* AppArmor requires that the buffer must be null terminated atm */ |
535 | if (args[size - 1] != '\0') { | |
536 | /* null terminate */ | |
537 | largs = args = kmalloc(size + 1, GFP_KERNEL); | |
538 | if (!args) | |
539 | return -ENOMEM; | |
540 | memcpy(args, value, size); | |
541 | args[size] = '\0'; | |
542 | } | |
543 | ||
544 | error = -EINVAL; | |
b5e95b48 JJ |
545 | args = strim(args); |
546 | command = strsep(&args, " "); | |
547 | if (!args) | |
e89b8081 | 548 | goto out; |
b5e95b48 JJ |
549 | args = skip_spaces(args); |
550 | if (!*args) | |
e89b8081 | 551 | goto out; |
b5e95b48 | 552 | |
d4d03f74 | 553 | arg_size = size - (args - (largs ? largs : (char *) value)); |
b5e95b48 JJ |
554 | if (strcmp(name, "current") == 0) { |
555 | if (strcmp(command, "changehat") == 0) { | |
556 | error = aa_setprocattr_changehat(args, arg_size, | |
557 | !AA_DO_TEST); | |
558 | } else if (strcmp(command, "permhat") == 0) { | |
559 | error = aa_setprocattr_changehat(args, arg_size, | |
560 | AA_DO_TEST); | |
561 | } else if (strcmp(command, "changeprofile") == 0) { | |
aa9a39ad JJ |
562 | error = aa_change_profile(args, !AA_ONEXEC, |
563 | !AA_DO_TEST, false); | |
b5e95b48 | 564 | } else if (strcmp(command, "permprofile") == 0) { |
aa9a39ad JJ |
565 | error = aa_change_profile(args, !AA_ONEXEC, AA_DO_TEST, |
566 | false); | |
3eea57c2 JJ |
567 | } else |
568 | goto fail; | |
b5e95b48 | 569 | } else if (strcmp(name, "exec") == 0) { |
3eea57c2 | 570 | if (strcmp(command, "exec") == 0) |
aa9a39ad JJ |
571 | error = aa_change_profile(args, AA_ONEXEC, !AA_DO_TEST, |
572 | false); | |
3eea57c2 JJ |
573 | else |
574 | goto fail; | |
575 | } else | |
b5e95b48 | 576 | /* only support the "current" and "exec" process attributes */ |
e89b8081 | 577 | goto fail; |
3eea57c2 | 578 | |
b5e95b48 JJ |
579 | if (!error) |
580 | error = size; | |
e89b8081 VN |
581 | out: |
582 | kfree(largs); | |
b5e95b48 | 583 | return error; |
3eea57c2 JJ |
584 | |
585 | fail: | |
cf797c0e | 586 | aad(&sa)->profile = begin_current_profile_crit_section(); |
ef88a7ac JJ |
587 | aad(&sa)->info = name; |
588 | aad(&sa)->error = error = -EINVAL; | |
3eea57c2 | 589 | aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL); |
cf797c0e | 590 | end_current_profile_crit_section(aad(&sa)->profile); |
e89b8081 | 591 | goto out; |
b5e95b48 JJ |
592 | } |
593 | ||
fe864821 JJ |
594 | /** |
595 | * apparmor_bprm_committing_creds - do task cleanup on committing new creds | |
596 | * @bprm: binprm for the exec (NOT NULL) | |
597 | */ | |
598 | static void apparmor_bprm_committing_creds(struct linux_binprm *bprm) | |
599 | { | |
cf797c0e | 600 | struct aa_profile *profile = aa_current_raw_profile(); |
fe864821 JJ |
601 | struct aa_task_ctx *new_ctx = cred_ctx(bprm->cred); |
602 | ||
603 | /* bail out if unconfined or not changing profile */ | |
604 | if ((new_ctx->profile == profile) || | |
605 | (unconfined(new_ctx->profile))) | |
606 | return; | |
607 | ||
608 | current->pdeath_signal = 0; | |
609 | ||
610 | /* reset soft limits and set hard limits for the new profile */ | |
611 | __aa_transition_rlimits(profile, new_ctx->profile); | |
612 | } | |
613 | ||
614 | /** | |
615 | * apparmor_bprm_committed_cred - do cleanup after new creds committed | |
616 | * @bprm: binprm for the exec (NOT NULL) | |
617 | */ | |
618 | static void apparmor_bprm_committed_creds(struct linux_binprm *bprm) | |
619 | { | |
620 | /* TODO: cleanup signals - ipc mediation */ | |
621 | return; | |
622 | } | |
623 | ||
7cb4dc9f JS |
624 | static int apparmor_task_setrlimit(struct task_struct *task, |
625 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 626 | { |
cf797c0e | 627 | struct aa_profile *profile = __begin_current_profile_crit_section(); |
b5e95b48 JJ |
628 | int error = 0; |
629 | ||
630 | if (!unconfined(profile)) | |
3a2dc838 | 631 | error = aa_task_setrlimit(profile, task, resource, new_rlim); |
cf797c0e | 632 | __end_current_profile_crit_section(profile); |
b5e95b48 JJ |
633 | |
634 | return error; | |
635 | } | |
636 | ||
ca97d939 | 637 | static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { |
e20b043a CS |
638 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), |
639 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
640 | LSM_HOOK_INIT(capget, apparmor_capget), | |
641 | LSM_HOOK_INIT(capable, apparmor_capable), | |
642 | ||
643 | LSM_HOOK_INIT(path_link, apparmor_path_link), | |
644 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
645 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
646 | LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir), | |
647 | LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir), | |
648 | LSM_HOOK_INIT(path_mknod, apparmor_path_mknod), | |
649 | LSM_HOOK_INIT(path_rename, apparmor_path_rename), | |
650 | LSM_HOOK_INIT(path_chmod, apparmor_path_chmod), | |
651 | LSM_HOOK_INIT(path_chown, apparmor_path_chown), | |
652 | LSM_HOOK_INIT(path_truncate, apparmor_path_truncate), | |
653 | LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr), | |
654 | ||
655 | LSM_HOOK_INIT(file_open, apparmor_file_open), | |
656 | LSM_HOOK_INIT(file_permission, apparmor_file_permission), | |
657 | LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security), | |
658 | LSM_HOOK_INIT(file_free_security, apparmor_file_free_security), | |
659 | LSM_HOOK_INIT(mmap_file, apparmor_mmap_file), | |
e20b043a CS |
660 | LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect), |
661 | LSM_HOOK_INIT(file_lock, apparmor_file_lock), | |
662 | ||
663 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
664 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
665 | ||
666 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), | |
667 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
668 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
669 | LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer), | |
670 | ||
671 | LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds), | |
672 | LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds), | |
673 | LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds), | |
674 | LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec), | |
675 | ||
676 | LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit), | |
b5e95b48 JJ |
677 | }; |
678 | ||
679 | /* | |
680 | * AppArmor sysfs module parameters | |
681 | */ | |
682 | ||
101d6c82 SR |
683 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
684 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 685 | #define param_check_aabool param_check_bool |
9c27847d | 686 | static const struct kernel_param_ops param_ops_aabool = { |
6a4c2643 | 687 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
688 | .set = param_set_aabool, |
689 | .get = param_get_aabool | |
690 | }; | |
b5e95b48 | 691 | |
101d6c82 SR |
692 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
693 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 694 | #define param_check_aauint param_check_uint |
9c27847d | 695 | static const struct kernel_param_ops param_ops_aauint = { |
101d6c82 SR |
696 | .set = param_set_aauint, |
697 | .get = param_get_aauint | |
698 | }; | |
b5e95b48 | 699 | |
101d6c82 SR |
700 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
701 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 702 | #define param_check_aalockpolicy param_check_bool |
9c27847d | 703 | static const struct kernel_param_ops param_ops_aalockpolicy = { |
6a4c2643 | 704 | .flags = KERNEL_PARAM_OPS_FL_NOARG, |
101d6c82 SR |
705 | .set = param_set_aalockpolicy, |
706 | .get = param_get_aalockpolicy | |
707 | }; | |
b5e95b48 JJ |
708 | |
709 | static int param_set_audit(const char *val, struct kernel_param *kp); | |
710 | static int param_get_audit(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
711 | |
712 | static int param_set_mode(const char *val, struct kernel_param *kp); | |
713 | static int param_get_mode(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
714 | |
715 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
716 | * We define special types as we want to do additional mediation. | |
717 | */ | |
718 | ||
719 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
720 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
721 | module_param_call(mode, param_set_mode, param_get_mode, | |
722 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
723 | ||
6059f71f | 724 | /* whether policy verification hashing is enabled */ |
7616ac70 | 725 | bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT); |
3ccb76c5 | 726 | #ifdef CONFIG_SECURITY_APPARMOR_HASH |
6059f71f | 727 | module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR); |
7616ac70 | 728 | #endif |
6059f71f | 729 | |
b5e95b48 | 730 | /* Debug mode */ |
eea7a05f | 731 | bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES); |
b5e95b48 JJ |
732 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
733 | ||
734 | /* Audit mode */ | |
735 | enum audit_mode aa_g_audit; | |
736 | module_param_call(audit, param_set_audit, param_get_audit, | |
737 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
738 | ||
739 | /* Determines if audit header is included in audited messages. This | |
740 | * provides more context if the audit daemon is not running | |
741 | */ | |
90ab5ee9 | 742 | bool aa_g_audit_header = 1; |
b5e95b48 JJ |
743 | module_param_named(audit_header, aa_g_audit_header, aabool, |
744 | S_IRUSR | S_IWUSR); | |
745 | ||
746 | /* lock out loading/removal of policy | |
747 | * TODO: add in at boot loading of policy, which is the only way to | |
748 | * load policy, if lock_policy is set | |
749 | */ | |
90ab5ee9 | 750 | bool aa_g_lock_policy; |
b5e95b48 JJ |
751 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
752 | S_IRUSR | S_IWUSR); | |
753 | ||
754 | /* Syscall logging mode */ | |
90ab5ee9 | 755 | bool aa_g_logsyscall; |
b5e95b48 JJ |
756 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
757 | ||
758 | /* Maximum pathname length before accesses will start getting rejected */ | |
759 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
622f6e32 | 760 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); |
b5e95b48 JJ |
761 | |
762 | /* Determines how paranoid loading of policy is and how much verification | |
763 | * on the loaded policy is done. | |
abbf8734 JJ |
764 | * DEPRECATED: read only as strict checking of load is always done now |
765 | * that none root users (user namespaces) can load policy. | |
b5e95b48 | 766 | */ |
90ab5ee9 | 767 | bool aa_g_paranoid_load = 1; |
abbf8734 | 768 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); |
b5e95b48 JJ |
769 | |
770 | /* Boot time disable flag */ | |
90ab5ee9 | 771 | static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; |
c611616c | 772 | module_param_named(enabled, apparmor_enabled, bool, S_IRUGO); |
b5e95b48 JJ |
773 | |
774 | static int __init apparmor_enabled_setup(char *str) | |
775 | { | |
776 | unsigned long enabled; | |
29707b20 | 777 | int error = kstrtoul(str, 0, &enabled); |
b5e95b48 JJ |
778 | if (!error) |
779 | apparmor_enabled = enabled ? 1 : 0; | |
780 | return 1; | |
781 | } | |
782 | ||
783 | __setup("apparmor=", apparmor_enabled_setup); | |
784 | ||
785 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 786 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 | 787 | { |
545de8fe JJ |
788 | if (!apparmor_enabled) |
789 | return -EINVAL; | |
790 | if (apparmor_initialized && !policy_admin_capable(NULL)) | |
b5e95b48 | 791 | return -EPERM; |
b5e95b48 JJ |
792 | return param_set_bool(val, kp); |
793 | } | |
794 | ||
101d6c82 | 795 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 796 | { |
ca4bd5ae JJ |
797 | if (!apparmor_enabled) |
798 | return -EINVAL; | |
545de8fe JJ |
799 | if (apparmor_initialized && !policy_view_capable(NULL)) |
800 | return -EPERM; | |
b5e95b48 JJ |
801 | return param_get_bool(buffer, kp); |
802 | } | |
803 | ||
101d6c82 | 804 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 | 805 | { |
ca4bd5ae JJ |
806 | if (!apparmor_enabled) |
807 | return -EINVAL; | |
545de8fe JJ |
808 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
809 | return -EPERM; | |
b5e95b48 JJ |
810 | return param_set_bool(val, kp); |
811 | } | |
812 | ||
101d6c82 | 813 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 814 | { |
ca4bd5ae JJ |
815 | if (!apparmor_enabled) |
816 | return -EINVAL; | |
545de8fe JJ |
817 | if (apparmor_initialized && !policy_view_capable(NULL)) |
818 | return -EPERM; | |
b5e95b48 JJ |
819 | return param_get_bool(buffer, kp); |
820 | } | |
821 | ||
101d6c82 | 822 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 | 823 | { |
39d84824 JJ |
824 | int error; |
825 | ||
ca4bd5ae JJ |
826 | if (!apparmor_enabled) |
827 | return -EINVAL; | |
39d84824 JJ |
828 | /* file is ro but enforce 2nd line check */ |
829 | if (apparmor_initialized) | |
545de8fe | 830 | return -EPERM; |
39d84824 JJ |
831 | |
832 | error = param_set_uint(val, kp); | |
833 | pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max); | |
834 | ||
835 | return error; | |
b5e95b48 JJ |
836 | } |
837 | ||
101d6c82 | 838 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 | 839 | { |
ca4bd5ae JJ |
840 | if (!apparmor_enabled) |
841 | return -EINVAL; | |
545de8fe JJ |
842 | if (apparmor_initialized && !policy_view_capable(NULL)) |
843 | return -EPERM; | |
b5e95b48 JJ |
844 | return param_get_uint(buffer, kp); |
845 | } | |
846 | ||
847 | static int param_get_audit(char *buffer, struct kernel_param *kp) | |
848 | { | |
b5e95b48 JJ |
849 | if (!apparmor_enabled) |
850 | return -EINVAL; | |
545de8fe JJ |
851 | if (apparmor_initialized && !policy_view_capable(NULL)) |
852 | return -EPERM; | |
b5e95b48 JJ |
853 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); |
854 | } | |
855 | ||
856 | static int param_set_audit(const char *val, struct kernel_param *kp) | |
857 | { | |
858 | int i; | |
b5e95b48 JJ |
859 | |
860 | if (!apparmor_enabled) | |
861 | return -EINVAL; | |
b5e95b48 JJ |
862 | if (!val) |
863 | return -EINVAL; | |
545de8fe JJ |
864 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
865 | return -EPERM; | |
b5e95b48 JJ |
866 | |
867 | for (i = 0; i < AUDIT_MAX_INDEX; i++) { | |
868 | if (strcmp(val, audit_mode_names[i]) == 0) { | |
869 | aa_g_audit = i; | |
870 | return 0; | |
871 | } | |
872 | } | |
873 | ||
874 | return -EINVAL; | |
875 | } | |
876 | ||
877 | static int param_get_mode(char *buffer, struct kernel_param *kp) | |
878 | { | |
b5e95b48 JJ |
879 | if (!apparmor_enabled) |
880 | return -EINVAL; | |
545de8fe JJ |
881 | if (apparmor_initialized && !policy_view_capable(NULL)) |
882 | return -EPERM; | |
b5e95b48 | 883 | |
0d259f04 | 884 | return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]); |
b5e95b48 JJ |
885 | } |
886 | ||
887 | static int param_set_mode(const char *val, struct kernel_param *kp) | |
888 | { | |
889 | int i; | |
b5e95b48 JJ |
890 | |
891 | if (!apparmor_enabled) | |
892 | return -EINVAL; | |
b5e95b48 JJ |
893 | if (!val) |
894 | return -EINVAL; | |
545de8fe JJ |
895 | if (apparmor_initialized && !policy_admin_capable(NULL)) |
896 | return -EPERM; | |
b5e95b48 | 897 | |
0d259f04 JJ |
898 | for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) { |
899 | if (strcmp(val, aa_profile_mode_names[i]) == 0) { | |
b5e95b48 JJ |
900 | aa_g_profile_mode = i; |
901 | return 0; | |
902 | } | |
903 | } | |
904 | ||
905 | return -EINVAL; | |
906 | } | |
907 | ||
908 | /* | |
909 | * AppArmor init functions | |
910 | */ | |
911 | ||
912 | /** | |
55a26ebf | 913 | * set_init_ctx - set a task context and profile on the first task. |
b5e95b48 JJ |
914 | * |
915 | * TODO: allow setting an alternate profile than unconfined | |
916 | */ | |
55a26ebf | 917 | static int __init set_init_ctx(void) |
b5e95b48 JJ |
918 | { |
919 | struct cred *cred = (struct cred *)current->real_cred; | |
55a26ebf | 920 | struct aa_task_ctx *ctx; |
b5e95b48 | 921 | |
55a26ebf JJ |
922 | ctx = aa_alloc_task_context(GFP_KERNEL); |
923 | if (!ctx) | |
b5e95b48 JJ |
924 | return -ENOMEM; |
925 | ||
55a26ebf JJ |
926 | ctx->profile = aa_get_profile(root_ns->unconfined); |
927 | cred_ctx(cred) = ctx; | |
b5e95b48 JJ |
928 | |
929 | return 0; | |
930 | } | |
931 | ||
d4669f0b JJ |
932 | static void destroy_buffers(void) |
933 | { | |
934 | u32 i, j; | |
935 | ||
936 | for_each_possible_cpu(i) { | |
937 | for_each_cpu_buffer(j) { | |
938 | kfree(per_cpu(aa_buffers, i).buf[j]); | |
939 | per_cpu(aa_buffers, i).buf[j] = NULL; | |
940 | } | |
941 | } | |
942 | } | |
943 | ||
944 | static int __init alloc_buffers(void) | |
945 | { | |
946 | u32 i, j; | |
947 | ||
948 | for_each_possible_cpu(i) { | |
949 | for_each_cpu_buffer(j) { | |
950 | char *buffer; | |
951 | ||
952 | if (cpu_to_node(i) > num_online_nodes()) | |
953 | /* fallback to kmalloc for offline nodes */ | |
954 | buffer = kmalloc(aa_g_path_max, GFP_KERNEL); | |
955 | else | |
956 | buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL, | |
957 | cpu_to_node(i)); | |
958 | if (!buffer) { | |
959 | destroy_buffers(); | |
960 | return -ENOMEM; | |
961 | } | |
962 | per_cpu(aa_buffers, i).buf[j] = buffer; | |
963 | } | |
964 | } | |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
e3ea1ca5 TH |
969 | #ifdef CONFIG_SYSCTL |
970 | static int apparmor_dointvec(struct ctl_table *table, int write, | |
971 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
972 | { | |
973 | if (!policy_admin_capable(NULL)) | |
974 | return -EPERM; | |
975 | if (!apparmor_enabled) | |
976 | return -EINVAL; | |
977 | ||
978 | return proc_dointvec(table, write, buffer, lenp, ppos); | |
979 | } | |
980 | ||
981 | static struct ctl_path apparmor_sysctl_path[] = { | |
982 | { .procname = "kernel", }, | |
983 | { } | |
984 | }; | |
985 | ||
986 | static struct ctl_table apparmor_sysctl_table[] = { | |
987 | { | |
988 | .procname = "unprivileged_userns_apparmor_policy", | |
989 | .data = &unprivileged_userns_apparmor_policy, | |
990 | .maxlen = sizeof(int), | |
991 | .mode = 0600, | |
992 | .proc_handler = apparmor_dointvec, | |
993 | }, | |
994 | { } | |
995 | }; | |
996 | ||
997 | static int __init apparmor_init_sysctl(void) | |
998 | { | |
999 | return register_sysctl_paths(apparmor_sysctl_path, | |
1000 | apparmor_sysctl_table) ? 0 : -ENOMEM; | |
1001 | } | |
1002 | #else | |
1003 | static inline int apparmor_init_sysctl(void) | |
1004 | { | |
1005 | return 0; | |
1006 | } | |
1007 | #endif /* CONFIG_SYSCTL */ | |
1008 | ||
b5e95b48 JJ |
1009 | static int __init apparmor_init(void) |
1010 | { | |
1011 | int error; | |
1012 | ||
b1d9e6b0 | 1013 | if (!apparmor_enabled || !security_module_enable("apparmor")) { |
b5e95b48 JJ |
1014 | aa_info_message("AppArmor disabled by boot time parameter"); |
1015 | apparmor_enabled = 0; | |
1016 | return 0; | |
1017 | } | |
1018 | ||
11c236b8 JJ |
1019 | error = aa_setup_dfa_engine(); |
1020 | if (error) { | |
1021 | AA_ERROR("Unable to setup dfa engine\n"); | |
1022 | goto alloc_out; | |
1023 | } | |
1024 | ||
b5e95b48 JJ |
1025 | error = aa_alloc_root_ns(); |
1026 | if (error) { | |
1027 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
1028 | goto alloc_out; | |
1029 | } | |
1030 | ||
e3ea1ca5 TH |
1031 | error = apparmor_init_sysctl(); |
1032 | if (error) { | |
1033 | AA_ERROR("Unable to register sysctls\n"); | |
1034 | goto alloc_out; | |
1035 | ||
1036 | } | |
1037 | ||
d4669f0b JJ |
1038 | error = alloc_buffers(); |
1039 | if (error) { | |
1040 | AA_ERROR("Unable to allocate work buffers\n"); | |
1041 | goto buffers_out; | |
1042 | } | |
1043 | ||
55a26ebf | 1044 | error = set_init_ctx(); |
b5e95b48 JJ |
1045 | if (error) { |
1046 | AA_ERROR("Failed to set context on init task\n"); | |
b1d9e6b0 | 1047 | aa_free_root_ns(); |
d4669f0b | 1048 | goto buffers_out; |
b5e95b48 | 1049 | } |
d69dece5 CS |
1050 | security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), |
1051 | "apparmor"); | |
b5e95b48 JJ |
1052 | |
1053 | /* Report that AppArmor successfully initialized */ | |
1054 | apparmor_initialized = 1; | |
1055 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
1056 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
1057 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
1058 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
1059 | else | |
1060 | aa_info_message("AppArmor initialized"); | |
1061 | ||
1062 | return error; | |
1063 | ||
d4669f0b JJ |
1064 | buffers_out: |
1065 | destroy_buffers(); | |
1066 | ||
b5e95b48 JJ |
1067 | alloc_out: |
1068 | aa_destroy_aafs(); | |
11c236b8 | 1069 | aa_teardown_dfa_engine(); |
b5e95b48 JJ |
1070 | |
1071 | apparmor_enabled = 0; | |
1072 | return error; | |
b5e95b48 JJ |
1073 | } |
1074 | ||
1075 | security_initcall(apparmor_init); |