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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 | ||
15 | #include <linux/security.h> | |
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> |
b5e95b48 JJ |
26 | #include <net/sock.h> |
27 | ||
28 | #include "include/apparmor.h" | |
29 | #include "include/apparmorfs.h" | |
30 | #include "include/audit.h" | |
31 | #include "include/capability.h" | |
32 | #include "include/context.h" | |
33 | #include "include/file.h" | |
34 | #include "include/ipc.h" | |
35 | #include "include/path.h" | |
36 | #include "include/policy.h" | |
37 | #include "include/procattr.h" | |
38 | ||
39 | /* Flag indicating whether initialization completed */ | |
40 | int apparmor_initialized __initdata; | |
41 | ||
42 | /* | |
43 | * LSM hook functions | |
44 | */ | |
45 | ||
46 | /* | |
47 | * free the associated aa_task_cxt and put its profiles | |
48 | */ | |
49 | static void apparmor_cred_free(struct cred *cred) | |
50 | { | |
51 | aa_free_task_context(cred->security); | |
52 | cred->security = NULL; | |
53 | } | |
54 | ||
55 | /* | |
56 | * allocate the apparmor part of blank credentials | |
57 | */ | |
58 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
59 | { | |
60 | /* freed by apparmor_cred_free */ | |
61 | struct aa_task_cxt *cxt = aa_alloc_task_context(gfp); | |
62 | if (!cxt) | |
63 | return -ENOMEM; | |
64 | ||
65 | cred->security = cxt; | |
66 | return 0; | |
67 | } | |
68 | ||
69 | /* | |
70 | * prepare new aa_task_cxt for modification by prepare_cred block | |
71 | */ | |
72 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
73 | gfp_t gfp) | |
74 | { | |
75 | /* freed by apparmor_cred_free */ | |
76 | struct aa_task_cxt *cxt = aa_alloc_task_context(gfp); | |
77 | if (!cxt) | |
78 | return -ENOMEM; | |
79 | ||
80 | aa_dup_task_context(cxt, old->security); | |
81 | new->security = cxt; | |
82 | return 0; | |
83 | } | |
84 | ||
85 | /* | |
86 | * transfer the apparmor data to a blank set of creds | |
87 | */ | |
88 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
89 | { | |
90 | const struct aa_task_cxt *old_cxt = old->security; | |
91 | struct aa_task_cxt *new_cxt = new->security; | |
92 | ||
93 | aa_dup_task_context(new_cxt, old_cxt); | |
94 | } | |
95 | ||
96 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
97 | unsigned int mode) | |
98 | { | |
99 | int error = cap_ptrace_access_check(child, mode); | |
100 | if (error) | |
101 | return error; | |
102 | ||
103 | return aa_ptrace(current, child, mode); | |
104 | } | |
105 | ||
106 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
107 | { | |
108 | int error = cap_ptrace_traceme(parent); | |
109 | if (error) | |
110 | return error; | |
111 | ||
112 | return aa_ptrace(parent, current, PTRACE_MODE_ATTACH); | |
113 | } | |
114 | ||
115 | /* Derived from security/commoncap.c:cap_capget */ | |
116 | static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective, | |
117 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
118 | { | |
119 | struct aa_profile *profile; | |
120 | const struct cred *cred; | |
121 | ||
122 | rcu_read_lock(); | |
123 | cred = __task_cred(target); | |
124 | profile = aa_cred_profile(cred); | |
125 | ||
126 | *effective = cred->cap_effective; | |
127 | *inheritable = cred->cap_inheritable; | |
128 | *permitted = cred->cap_permitted; | |
129 | ||
25e75dff | 130 | if (!unconfined(profile) && !COMPLAIN_MODE(profile)) { |
b5e95b48 JJ |
131 | *effective = cap_intersect(*effective, profile->caps.allow); |
132 | *permitted = cap_intersect(*permitted, profile->caps.allow); | |
133 | } | |
134 | rcu_read_unlock(); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static int apparmor_capable(struct task_struct *task, const struct cred *cred, | |
3486740a | 140 | struct user_namespace *ns, int cap, int audit) |
b5e95b48 JJ |
141 | { |
142 | struct aa_profile *profile; | |
143 | /* cap_capable returns 0 on success, else -EPERM */ | |
3486740a | 144 | int error = cap_capable(task, cred, ns, cap, audit); |
b5e95b48 JJ |
145 | if (!error) { |
146 | profile = aa_cred_profile(cred); | |
147 | if (!unconfined(profile)) | |
148 | error = aa_capable(task, profile, cap, audit); | |
149 | } | |
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 | */ | |
162 | static int common_perm(int op, struct path *path, u32 mask, | |
163 | struct path_cond *cond) | |
164 | { | |
165 | struct aa_profile *profile; | |
166 | int error = 0; | |
167 | ||
168 | profile = __aa_current_profile(); | |
169 | if (!unconfined(profile)) | |
170 | error = aa_path_perm(op, profile, path, 0, mask, cond); | |
171 | ||
172 | return error; | |
173 | } | |
174 | ||
175 | /** | |
176 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry | |
177 | * @op: operation being checked | |
178 | * @dir: directory of the dentry (NOT NULL) | |
179 | * @dentry: dentry to check (NOT NULL) | |
180 | * @mask: requested permissions mask | |
181 | * @cond: conditional info for the permission request (NOT NULL) | |
182 | * | |
183 | * Returns: %0 else error code if error or permission denied | |
184 | */ | |
185 | static int common_perm_dir_dentry(int op, struct path *dir, | |
186 | struct dentry *dentry, u32 mask, | |
187 | struct path_cond *cond) | |
188 | { | |
189 | struct path path = { dir->mnt, dentry }; | |
190 | ||
191 | return common_perm(op, &path, mask, cond); | |
192 | } | |
193 | ||
194 | /** | |
195 | * common_perm_mnt_dentry - common permission wrapper when mnt, dentry | |
196 | * @op: operation being checked | |
197 | * @mnt: mount point of dentry (NOT NULL) | |
198 | * @dentry: dentry to check (NOT NULL) | |
199 | * @mask: requested permissions mask | |
200 | * | |
201 | * Returns: %0 else error code if error or permission denied | |
202 | */ | |
203 | static int common_perm_mnt_dentry(int op, struct vfsmount *mnt, | |
204 | struct dentry *dentry, u32 mask) | |
205 | { | |
206 | struct path path = { mnt, dentry }; | |
207 | struct path_cond cond = { dentry->d_inode->i_uid, | |
208 | dentry->d_inode->i_mode | |
209 | }; | |
210 | ||
211 | return common_perm(op, &path, mask, &cond); | |
212 | } | |
213 | ||
214 | /** | |
215 | * common_perm_rm - common permission wrapper for operations doing rm | |
216 | * @op: operation being checked | |
217 | * @dir: directory that the dentry is in (NOT NULL) | |
218 | * @dentry: dentry being rm'd (NOT NULL) | |
219 | * @mask: requested permission mask | |
220 | * | |
221 | * Returns: %0 else error code if error or permission denied | |
222 | */ | |
223 | static int common_perm_rm(int op, struct path *dir, | |
224 | struct dentry *dentry, u32 mask) | |
225 | { | |
226 | struct inode *inode = dentry->d_inode; | |
227 | struct path_cond cond = { }; | |
228 | ||
229 | if (!inode || !dir->mnt || !mediated_filesystem(inode)) | |
230 | return 0; | |
231 | ||
232 | cond.uid = inode->i_uid; | |
233 | cond.mode = inode->i_mode; | |
234 | ||
235 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
236 | } | |
237 | ||
238 | /** | |
239 | * common_perm_create - common permission wrapper for operations doing create | |
240 | * @op: operation being checked | |
241 | * @dir: directory that dentry will be created in (NOT NULL) | |
242 | * @dentry: dentry to create (NOT NULL) | |
243 | * @mask: request permission mask | |
244 | * @mode: created file mode | |
245 | * | |
246 | * Returns: %0 else error code if error or permission denied | |
247 | */ | |
248 | static int common_perm_create(int op, struct path *dir, struct dentry *dentry, | |
249 | u32 mask, umode_t mode) | |
250 | { | |
251 | struct path_cond cond = { current_fsuid(), mode }; | |
252 | ||
253 | if (!dir->mnt || !mediated_filesystem(dir->dentry->d_inode)) | |
254 | return 0; | |
255 | ||
256 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
257 | } | |
258 | ||
259 | static int apparmor_path_unlink(struct path *dir, struct dentry *dentry) | |
260 | { | |
261 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
262 | } | |
263 | ||
264 | static int apparmor_path_mkdir(struct path *dir, struct dentry *dentry, | |
4572befe | 265 | umode_t mode) |
b5e95b48 JJ |
266 | { |
267 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
268 | S_IFDIR); | |
269 | } | |
270 | ||
271 | static int apparmor_path_rmdir(struct path *dir, struct dentry *dentry) | |
272 | { | |
273 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
274 | } | |
275 | ||
276 | static int apparmor_path_mknod(struct path *dir, struct dentry *dentry, | |
04fc66e7 | 277 | umode_t mode, unsigned int dev) |
b5e95b48 JJ |
278 | { |
279 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
280 | } | |
281 | ||
4d6ec10b | 282 | static int apparmor_path_truncate(struct path *path) |
b5e95b48 JJ |
283 | { |
284 | struct path_cond cond = { path->dentry->d_inode->i_uid, | |
285 | path->dentry->d_inode->i_mode | |
286 | }; | |
287 | ||
288 | if (!path->mnt || !mediated_filesystem(path->dentry->d_inode)) | |
289 | return 0; | |
290 | ||
291 | return common_perm(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE, | |
292 | &cond); | |
293 | } | |
294 | ||
295 | static int apparmor_path_symlink(struct path *dir, struct dentry *dentry, | |
296 | const char *old_name) | |
297 | { | |
298 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
299 | S_IFLNK); | |
300 | } | |
301 | ||
302 | static int apparmor_path_link(struct dentry *old_dentry, struct path *new_dir, | |
303 | struct dentry *new_dentry) | |
304 | { | |
305 | struct aa_profile *profile; | |
306 | int error = 0; | |
307 | ||
308 | if (!mediated_filesystem(old_dentry->d_inode)) | |
309 | return 0; | |
310 | ||
311 | profile = aa_current_profile(); | |
312 | if (!unconfined(profile)) | |
313 | error = aa_path_link(profile, old_dentry, new_dir, new_dentry); | |
314 | return error; | |
315 | } | |
316 | ||
317 | static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry, | |
318 | struct path *new_dir, struct dentry *new_dentry) | |
319 | { | |
320 | struct aa_profile *profile; | |
321 | int error = 0; | |
322 | ||
323 | if (!mediated_filesystem(old_dentry->d_inode)) | |
324 | return 0; | |
325 | ||
326 | profile = aa_current_profile(); | |
327 | if (!unconfined(profile)) { | |
328 | struct path old_path = { old_dir->mnt, old_dentry }; | |
329 | struct path new_path = { new_dir->mnt, new_dentry }; | |
330 | struct path_cond cond = { old_dentry->d_inode->i_uid, | |
331 | old_dentry->d_inode->i_mode | |
332 | }; | |
333 | ||
334 | error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0, | |
335 | MAY_READ | AA_MAY_META_READ | MAY_WRITE | | |
336 | AA_MAY_META_WRITE | AA_MAY_DELETE, | |
337 | &cond); | |
338 | if (!error) | |
339 | error = aa_path_perm(OP_RENAME_DEST, profile, &new_path, | |
340 | 0, MAY_WRITE | AA_MAY_META_WRITE | | |
341 | AA_MAY_CREATE, &cond); | |
342 | ||
343 | } | |
344 | return error; | |
345 | } | |
346 | ||
cdcf116d | 347 | static int apparmor_path_chmod(struct path *path, umode_t mode) |
b5e95b48 | 348 | { |
cdcf116d | 349 | if (!mediated_filesystem(path->dentry->d_inode)) |
b5e95b48 JJ |
350 | return 0; |
351 | ||
cdcf116d | 352 | return common_perm_mnt_dentry(OP_CHMOD, path->mnt, path->dentry, AA_MAY_CHMOD); |
b5e95b48 JJ |
353 | } |
354 | ||
355 | static int apparmor_path_chown(struct path *path, uid_t uid, gid_t gid) | |
356 | { | |
357 | struct path_cond cond = { path->dentry->d_inode->i_uid, | |
358 | path->dentry->d_inode->i_mode | |
359 | }; | |
360 | ||
361 | if (!mediated_filesystem(path->dentry->d_inode)) | |
362 | return 0; | |
363 | ||
364 | return common_perm(OP_CHOWN, path, AA_MAY_CHOWN, &cond); | |
365 | } | |
366 | ||
367 | static int apparmor_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
368 | { | |
369 | if (!mediated_filesystem(dentry->d_inode)) | |
370 | return 0; | |
371 | ||
372 | return common_perm_mnt_dentry(OP_GETATTR, mnt, dentry, | |
373 | AA_MAY_META_READ); | |
374 | } | |
375 | ||
376 | static int apparmor_dentry_open(struct file *file, const struct cred *cred) | |
377 | { | |
378 | struct aa_file_cxt *fcxt = file->f_security; | |
379 | struct aa_profile *profile; | |
380 | int error = 0; | |
381 | ||
382 | if (!mediated_filesystem(file->f_path.dentry->d_inode)) | |
383 | return 0; | |
384 | ||
385 | /* If in exec, permission is handled by bprm hooks. | |
386 | * Cache permissions granted by the previous exec check, with | |
387 | * implicit read and executable mmap which are required to | |
388 | * actually execute the image. | |
389 | */ | |
390 | if (current->in_execve) { | |
391 | fcxt->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP; | |
392 | return 0; | |
393 | } | |
394 | ||
395 | profile = aa_cred_profile(cred); | |
396 | if (!unconfined(profile)) { | |
397 | struct inode *inode = file->f_path.dentry->d_inode; | |
398 | struct path_cond cond = { inode->i_uid, inode->i_mode }; | |
399 | ||
400 | error = aa_path_perm(OP_OPEN, profile, &file->f_path, 0, | |
401 | aa_map_file_to_perms(file), &cond); | |
402 | /* todo cache full allowed permissions set and state */ | |
403 | fcxt->allow = aa_map_file_to_perms(file); | |
404 | } | |
405 | ||
406 | return error; | |
407 | } | |
408 | ||
409 | static int apparmor_file_alloc_security(struct file *file) | |
410 | { | |
411 | /* freed by apparmor_file_free_security */ | |
412 | file->f_security = aa_alloc_file_context(GFP_KERNEL); | |
413 | if (!file->f_security) | |
414 | return -ENOMEM; | |
415 | return 0; | |
416 | ||
417 | } | |
418 | ||
419 | static void apparmor_file_free_security(struct file *file) | |
420 | { | |
421 | struct aa_file_cxt *cxt = file->f_security; | |
422 | ||
423 | aa_free_file_context(cxt); | |
424 | } | |
425 | ||
426 | static int common_file_perm(int op, struct file *file, u32 mask) | |
427 | { | |
428 | struct aa_file_cxt *fcxt = file->f_security; | |
429 | struct aa_profile *profile, *fprofile = aa_cred_profile(file->f_cred); | |
430 | int error = 0; | |
431 | ||
432 | BUG_ON(!fprofile); | |
433 | ||
434 | if (!file->f_path.mnt || | |
435 | !mediated_filesystem(file->f_path.dentry->d_inode)) | |
436 | return 0; | |
437 | ||
438 | profile = __aa_current_profile(); | |
439 | ||
440 | /* revalidate access, if task is unconfined, or the cached cred | |
441 | * doesn't match or if the request is for more permissions than | |
442 | * was granted. | |
443 | * | |
444 | * Note: the test for !unconfined(fprofile) is to handle file | |
445 | * delegation from unconfined tasks | |
446 | */ | |
447 | if (!unconfined(profile) && !unconfined(fprofile) && | |
448 | ((fprofile != profile) || (mask & ~fcxt->allow))) | |
449 | error = aa_file_perm(op, profile, file, mask); | |
450 | ||
451 | return error; | |
452 | } | |
453 | ||
454 | static int apparmor_file_permission(struct file *file, int mask) | |
455 | { | |
456 | return common_file_perm(OP_FPERM, file, mask); | |
457 | } | |
458 | ||
459 | static int apparmor_file_lock(struct file *file, unsigned int cmd) | |
460 | { | |
461 | u32 mask = AA_MAY_LOCK; | |
462 | ||
463 | if (cmd == F_WRLCK) | |
464 | mask |= MAY_WRITE; | |
465 | ||
466 | return common_file_perm(OP_FLOCK, file, mask); | |
467 | } | |
468 | ||
469 | static int common_mmap(int op, struct file *file, unsigned long prot, | |
470 | unsigned long flags) | |
471 | { | |
472 | struct dentry *dentry; | |
473 | int mask = 0; | |
474 | ||
475 | if (!file || !file->f_security) | |
476 | return 0; | |
477 | ||
478 | if (prot & PROT_READ) | |
479 | mask |= MAY_READ; | |
480 | /* | |
481 | * Private mappings don't require write perms since they don't | |
482 | * write back to the files | |
483 | */ | |
484 | if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE)) | |
485 | mask |= MAY_WRITE; | |
486 | if (prot & PROT_EXEC) | |
487 | mask |= AA_EXEC_MMAP; | |
488 | ||
489 | dentry = file->f_path.dentry; | |
490 | return common_file_perm(op, file, mask); | |
491 | } | |
492 | ||
493 | static int apparmor_file_mmap(struct file *file, unsigned long reqprot, | |
494 | unsigned long prot, unsigned long flags, | |
495 | unsigned long addr, unsigned long addr_only) | |
496 | { | |
497 | int rc = 0; | |
498 | ||
499 | /* do DAC check */ | |
500 | rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only); | |
501 | if (rc || addr_only) | |
502 | return rc; | |
503 | ||
504 | return common_mmap(OP_FMMAP, file, prot, flags); | |
505 | } | |
506 | ||
507 | static int apparmor_file_mprotect(struct vm_area_struct *vma, | |
508 | unsigned long reqprot, unsigned long prot) | |
509 | { | |
510 | return common_mmap(OP_FMPROT, vma->vm_file, prot, | |
511 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); | |
512 | } | |
513 | ||
514 | static int apparmor_getprocattr(struct task_struct *task, char *name, | |
515 | char **value) | |
516 | { | |
517 | int error = -ENOENT; | |
518 | struct aa_profile *profile; | |
519 | /* released below */ | |
520 | const struct cred *cred = get_task_cred(task); | |
521 | struct aa_task_cxt *cxt = cred->security; | |
522 | profile = aa_cred_profile(cred); | |
523 | ||
524 | if (strcmp(name, "current") == 0) | |
525 | error = aa_getprocattr(aa_newest_version(cxt->profile), | |
526 | value); | |
527 | else if (strcmp(name, "prev") == 0 && cxt->previous) | |
528 | error = aa_getprocattr(aa_newest_version(cxt->previous), | |
529 | value); | |
530 | else if (strcmp(name, "exec") == 0 && cxt->onexec) | |
531 | error = aa_getprocattr(aa_newest_version(cxt->onexec), | |
532 | value); | |
533 | else | |
534 | error = -EINVAL; | |
535 | ||
536 | put_cred(cred); | |
537 | ||
538 | return error; | |
539 | } | |
540 | ||
541 | static int apparmor_setprocattr(struct task_struct *task, char *name, | |
542 | void *value, size_t size) | |
543 | { | |
544 | char *command, *args = value; | |
545 | size_t arg_size; | |
546 | int error; | |
547 | ||
548 | if (size == 0) | |
549 | return -EINVAL; | |
550 | /* args points to a PAGE_SIZE buffer, AppArmor requires that | |
551 | * the buffer must be null terminated or have size <= PAGE_SIZE -1 | |
552 | * so that AppArmor can null terminate them | |
553 | */ | |
554 | if (args[size - 1] != '\0') { | |
555 | if (size == PAGE_SIZE) | |
556 | return -EINVAL; | |
557 | args[size] = '\0'; | |
558 | } | |
559 | ||
560 | /* task can only write its own attributes */ | |
561 | if (current != task) | |
562 | return -EACCES; | |
563 | ||
564 | args = value; | |
565 | args = strim(args); | |
566 | command = strsep(&args, " "); | |
567 | if (!args) | |
568 | return -EINVAL; | |
569 | args = skip_spaces(args); | |
570 | if (!*args) | |
571 | return -EINVAL; | |
572 | ||
573 | arg_size = size - (args - (char *) value); | |
574 | if (strcmp(name, "current") == 0) { | |
575 | if (strcmp(command, "changehat") == 0) { | |
576 | error = aa_setprocattr_changehat(args, arg_size, | |
577 | !AA_DO_TEST); | |
578 | } else if (strcmp(command, "permhat") == 0) { | |
579 | error = aa_setprocattr_changehat(args, arg_size, | |
580 | AA_DO_TEST); | |
581 | } else if (strcmp(command, "changeprofile") == 0) { | |
582 | error = aa_setprocattr_changeprofile(args, !AA_ONEXEC, | |
583 | !AA_DO_TEST); | |
584 | } else if (strcmp(command, "permprofile") == 0) { | |
585 | error = aa_setprocattr_changeprofile(args, !AA_ONEXEC, | |
586 | AA_DO_TEST); | |
587 | } else if (strcmp(command, "permipc") == 0) { | |
588 | error = aa_setprocattr_permipc(args); | |
589 | } else { | |
590 | struct common_audit_data sa; | |
591 | COMMON_AUDIT_DATA_INIT(&sa, NONE); | |
592 | sa.aad.op = OP_SETPROCATTR; | |
593 | sa.aad.info = name; | |
594 | sa.aad.error = -EINVAL; | |
a5b2c5b2 KC |
595 | return aa_audit(AUDIT_APPARMOR_DENIED, |
596 | __aa_current_profile(), GFP_KERNEL, | |
b5e95b48 JJ |
597 | &sa, NULL); |
598 | } | |
599 | } else if (strcmp(name, "exec") == 0) { | |
600 | error = aa_setprocattr_changeprofile(args, AA_ONEXEC, | |
601 | !AA_DO_TEST); | |
602 | } else { | |
603 | /* only support the "current" and "exec" process attributes */ | |
604 | return -EINVAL; | |
605 | } | |
606 | if (!error) | |
607 | error = size; | |
608 | return error; | |
609 | } | |
610 | ||
7cb4dc9f JS |
611 | static int apparmor_task_setrlimit(struct task_struct *task, |
612 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 | 613 | { |
1780f2d3 | 614 | struct aa_profile *profile = __aa_current_profile(); |
b5e95b48 JJ |
615 | int error = 0; |
616 | ||
617 | if (!unconfined(profile)) | |
3a2dc838 | 618 | error = aa_task_setrlimit(profile, task, resource, new_rlim); |
b5e95b48 JJ |
619 | |
620 | return error; | |
621 | } | |
622 | ||
623 | static struct security_operations apparmor_ops = { | |
624 | .name = "apparmor", | |
625 | ||
626 | .ptrace_access_check = apparmor_ptrace_access_check, | |
627 | .ptrace_traceme = apparmor_ptrace_traceme, | |
628 | .capget = apparmor_capget, | |
629 | .capable = apparmor_capable, | |
630 | ||
631 | .path_link = apparmor_path_link, | |
632 | .path_unlink = apparmor_path_unlink, | |
633 | .path_symlink = apparmor_path_symlink, | |
634 | .path_mkdir = apparmor_path_mkdir, | |
635 | .path_rmdir = apparmor_path_rmdir, | |
636 | .path_mknod = apparmor_path_mknod, | |
637 | .path_rename = apparmor_path_rename, | |
638 | .path_chmod = apparmor_path_chmod, | |
639 | .path_chown = apparmor_path_chown, | |
640 | .path_truncate = apparmor_path_truncate, | |
641 | .dentry_open = apparmor_dentry_open, | |
642 | .inode_getattr = apparmor_inode_getattr, | |
643 | ||
644 | .file_permission = apparmor_file_permission, | |
645 | .file_alloc_security = apparmor_file_alloc_security, | |
646 | .file_free_security = apparmor_file_free_security, | |
647 | .file_mmap = apparmor_file_mmap, | |
648 | .file_mprotect = apparmor_file_mprotect, | |
649 | .file_lock = apparmor_file_lock, | |
650 | ||
651 | .getprocattr = apparmor_getprocattr, | |
652 | .setprocattr = apparmor_setprocattr, | |
653 | ||
654 | .cred_alloc_blank = apparmor_cred_alloc_blank, | |
655 | .cred_free = apparmor_cred_free, | |
656 | .cred_prepare = apparmor_cred_prepare, | |
657 | .cred_transfer = apparmor_cred_transfer, | |
658 | ||
659 | .bprm_set_creds = apparmor_bprm_set_creds, | |
660 | .bprm_committing_creds = apparmor_bprm_committing_creds, | |
661 | .bprm_committed_creds = apparmor_bprm_committed_creds, | |
662 | .bprm_secureexec = apparmor_bprm_secureexec, | |
663 | ||
664 | .task_setrlimit = apparmor_task_setrlimit, | |
665 | }; | |
666 | ||
667 | /* | |
668 | * AppArmor sysfs module parameters | |
669 | */ | |
670 | ||
101d6c82 SR |
671 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
672 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 673 | #define param_check_aabool param_check_bool |
101d6c82 SR |
674 | static struct kernel_param_ops param_ops_aabool = { |
675 | .set = param_set_aabool, | |
676 | .get = param_get_aabool | |
677 | }; | |
b5e95b48 | 678 | |
101d6c82 SR |
679 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
680 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 681 | #define param_check_aauint param_check_uint |
101d6c82 SR |
682 | static struct kernel_param_ops param_ops_aauint = { |
683 | .set = param_set_aauint, | |
684 | .get = param_get_aauint | |
685 | }; | |
b5e95b48 | 686 | |
101d6c82 SR |
687 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
688 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b8aa09fd | 689 | #define param_check_aalockpolicy param_check_bool |
101d6c82 SR |
690 | static struct kernel_param_ops param_ops_aalockpolicy = { |
691 | .set = param_set_aalockpolicy, | |
692 | .get = param_get_aalockpolicy | |
693 | }; | |
b5e95b48 JJ |
694 | |
695 | static int param_set_audit(const char *val, struct kernel_param *kp); | |
696 | static int param_get_audit(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
697 | |
698 | static int param_set_mode(const char *val, struct kernel_param *kp); | |
699 | static int param_get_mode(char *buffer, struct kernel_param *kp); | |
b5e95b48 JJ |
700 | |
701 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
702 | * We define special types as we want to do additional mediation. | |
703 | */ | |
704 | ||
705 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
706 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
707 | module_param_call(mode, param_set_mode, param_get_mode, | |
708 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
709 | ||
710 | /* Debug mode */ | |
90ab5ee9 | 711 | bool aa_g_debug; |
b5e95b48 JJ |
712 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); |
713 | ||
714 | /* Audit mode */ | |
715 | enum audit_mode aa_g_audit; | |
716 | module_param_call(audit, param_set_audit, param_get_audit, | |
717 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
718 | ||
719 | /* Determines if audit header is included in audited messages. This | |
720 | * provides more context if the audit daemon is not running | |
721 | */ | |
90ab5ee9 | 722 | bool aa_g_audit_header = 1; |
b5e95b48 JJ |
723 | module_param_named(audit_header, aa_g_audit_header, aabool, |
724 | S_IRUSR | S_IWUSR); | |
725 | ||
726 | /* lock out loading/removal of policy | |
727 | * TODO: add in at boot loading of policy, which is the only way to | |
728 | * load policy, if lock_policy is set | |
729 | */ | |
90ab5ee9 | 730 | bool aa_g_lock_policy; |
b5e95b48 JJ |
731 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, |
732 | S_IRUSR | S_IWUSR); | |
733 | ||
734 | /* Syscall logging mode */ | |
90ab5ee9 | 735 | bool aa_g_logsyscall; |
b5e95b48 JJ |
736 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); |
737 | ||
738 | /* Maximum pathname length before accesses will start getting rejected */ | |
739 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
740 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR); | |
741 | ||
742 | /* Determines how paranoid loading of policy is and how much verification | |
743 | * on the loaded policy is done. | |
744 | */ | |
90ab5ee9 | 745 | bool aa_g_paranoid_load = 1; |
b5e95b48 JJ |
746 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, |
747 | S_IRUSR | S_IWUSR); | |
748 | ||
749 | /* Boot time disable flag */ | |
90ab5ee9 | 750 | static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; |
b5e95b48 JJ |
751 | module_param_named(enabled, apparmor_enabled, aabool, S_IRUSR); |
752 | ||
753 | static int __init apparmor_enabled_setup(char *str) | |
754 | { | |
755 | unsigned long enabled; | |
756 | int error = strict_strtoul(str, 0, &enabled); | |
757 | if (!error) | |
758 | apparmor_enabled = enabled ? 1 : 0; | |
759 | return 1; | |
760 | } | |
761 | ||
762 | __setup("apparmor=", apparmor_enabled_setup); | |
763 | ||
764 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 765 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
766 | { |
767 | if (!capable(CAP_MAC_ADMIN)) | |
768 | return -EPERM; | |
769 | if (aa_g_lock_policy) | |
770 | return -EACCES; | |
771 | return param_set_bool(val, kp); | |
772 | } | |
773 | ||
101d6c82 | 774 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 JJ |
775 | { |
776 | if (!capable(CAP_MAC_ADMIN)) | |
777 | return -EPERM; | |
778 | return param_get_bool(buffer, kp); | |
779 | } | |
780 | ||
101d6c82 | 781 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
782 | { |
783 | if (!capable(CAP_MAC_ADMIN)) | |
784 | return -EPERM; | |
785 | return param_set_bool(val, kp); | |
786 | } | |
787 | ||
101d6c82 | 788 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 JJ |
789 | { |
790 | if (!capable(CAP_MAC_ADMIN)) | |
791 | return -EPERM; | |
792 | return param_get_bool(buffer, kp); | |
793 | } | |
794 | ||
101d6c82 | 795 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
796 | { |
797 | if (!capable(CAP_MAC_ADMIN)) | |
798 | return -EPERM; | |
799 | return param_set_uint(val, kp); | |
800 | } | |
801 | ||
101d6c82 | 802 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 JJ |
803 | { |
804 | if (!capable(CAP_MAC_ADMIN)) | |
805 | return -EPERM; | |
806 | return param_get_uint(buffer, kp); | |
807 | } | |
808 | ||
809 | static int param_get_audit(char *buffer, struct kernel_param *kp) | |
810 | { | |
811 | if (!capable(CAP_MAC_ADMIN)) | |
812 | return -EPERM; | |
813 | ||
814 | if (!apparmor_enabled) | |
815 | return -EINVAL; | |
816 | ||
817 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); | |
818 | } | |
819 | ||
820 | static int param_set_audit(const char *val, struct kernel_param *kp) | |
821 | { | |
822 | int i; | |
823 | if (!capable(CAP_MAC_ADMIN)) | |
824 | return -EPERM; | |
825 | ||
826 | if (!apparmor_enabled) | |
827 | return -EINVAL; | |
828 | ||
829 | if (!val) | |
830 | return -EINVAL; | |
831 | ||
832 | for (i = 0; i < AUDIT_MAX_INDEX; i++) { | |
833 | if (strcmp(val, audit_mode_names[i]) == 0) { | |
834 | aa_g_audit = i; | |
835 | return 0; | |
836 | } | |
837 | } | |
838 | ||
839 | return -EINVAL; | |
840 | } | |
841 | ||
842 | static int param_get_mode(char *buffer, struct kernel_param *kp) | |
843 | { | |
844 | if (!capable(CAP_MAC_ADMIN)) | |
845 | return -EPERM; | |
846 | ||
847 | if (!apparmor_enabled) | |
848 | return -EINVAL; | |
849 | ||
850 | return sprintf(buffer, "%s", profile_mode_names[aa_g_profile_mode]); | |
851 | } | |
852 | ||
853 | static int param_set_mode(const char *val, struct kernel_param *kp) | |
854 | { | |
855 | int i; | |
856 | if (!capable(CAP_MAC_ADMIN)) | |
857 | return -EPERM; | |
858 | ||
859 | if (!apparmor_enabled) | |
860 | return -EINVAL; | |
861 | ||
862 | if (!val) | |
863 | return -EINVAL; | |
864 | ||
865 | for (i = 0; i < APPARMOR_NAMES_MAX_INDEX; i++) { | |
866 | if (strcmp(val, profile_mode_names[i]) == 0) { | |
867 | aa_g_profile_mode = i; | |
868 | return 0; | |
869 | } | |
870 | } | |
871 | ||
872 | return -EINVAL; | |
873 | } | |
874 | ||
875 | /* | |
876 | * AppArmor init functions | |
877 | */ | |
878 | ||
879 | /** | |
880 | * set_init_cxt - set a task context and profile on the first task. | |
881 | * | |
882 | * TODO: allow setting an alternate profile than unconfined | |
883 | */ | |
884 | static int __init set_init_cxt(void) | |
885 | { | |
886 | struct cred *cred = (struct cred *)current->real_cred; | |
887 | struct aa_task_cxt *cxt; | |
888 | ||
889 | cxt = aa_alloc_task_context(GFP_KERNEL); | |
890 | if (!cxt) | |
891 | return -ENOMEM; | |
892 | ||
893 | cxt->profile = aa_get_profile(root_ns->unconfined); | |
894 | cred->security = cxt; | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
899 | static int __init apparmor_init(void) | |
900 | { | |
901 | int error; | |
902 | ||
903 | if (!apparmor_enabled || !security_module_enable(&apparmor_ops)) { | |
904 | aa_info_message("AppArmor disabled by boot time parameter"); | |
905 | apparmor_enabled = 0; | |
906 | return 0; | |
907 | } | |
908 | ||
909 | error = aa_alloc_root_ns(); | |
910 | if (error) { | |
911 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
912 | goto alloc_out; | |
913 | } | |
914 | ||
915 | error = set_init_cxt(); | |
916 | if (error) { | |
917 | AA_ERROR("Failed to set context on init task\n"); | |
918 | goto register_security_out; | |
919 | } | |
920 | ||
921 | error = register_security(&apparmor_ops); | |
922 | if (error) { | |
923 | AA_ERROR("Unable to register AppArmor\n"); | |
a26d279e | 924 | goto set_init_cxt_out; |
b5e95b48 JJ |
925 | } |
926 | ||
927 | /* Report that AppArmor successfully initialized */ | |
928 | apparmor_initialized = 1; | |
929 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
930 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
931 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
932 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
933 | else | |
934 | aa_info_message("AppArmor initialized"); | |
935 | ||
936 | return error; | |
937 | ||
a26d279e | 938 | set_init_cxt_out: |
939 | aa_free_task_context(current->real_cred->security); | |
940 | ||
b5e95b48 JJ |
941 | register_security_out: |
942 | aa_free_root_ns(); | |
943 | ||
944 | alloc_out: | |
945 | aa_destroy_aafs(); | |
946 | ||
947 | apparmor_enabled = 0; | |
948 | return error; | |
b5e95b48 JJ |
949 | } |
950 | ||
951 | security_initcall(apparmor_init); |