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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> | |
25 | #include <net/sock.h> | |
26 | ||
27 | #include "include/apparmor.h" | |
28 | #include "include/apparmorfs.h" | |
29 | #include "include/audit.h" | |
30 | #include "include/capability.h" | |
31 | #include "include/context.h" | |
32 | #include "include/file.h" | |
33 | #include "include/ipc.h" | |
34 | #include "include/path.h" | |
35 | #include "include/policy.h" | |
36 | #include "include/procattr.h" | |
37 | ||
38 | /* Flag indicating whether initialization completed */ | |
39 | int apparmor_initialized __initdata; | |
40 | ||
41 | /* | |
42 | * LSM hook functions | |
43 | */ | |
44 | ||
45 | /* | |
46 | * free the associated aa_task_cxt and put its profiles | |
47 | */ | |
48 | static void apparmor_cred_free(struct cred *cred) | |
49 | { | |
50 | aa_free_task_context(cred->security); | |
51 | cred->security = NULL; | |
52 | } | |
53 | ||
54 | /* | |
55 | * allocate the apparmor part of blank credentials | |
56 | */ | |
57 | static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
58 | { | |
59 | /* freed by apparmor_cred_free */ | |
60 | struct aa_task_cxt *cxt = aa_alloc_task_context(gfp); | |
61 | if (!cxt) | |
62 | return -ENOMEM; | |
63 | ||
64 | cred->security = cxt; | |
65 | return 0; | |
66 | } | |
67 | ||
68 | /* | |
69 | * prepare new aa_task_cxt for modification by prepare_cred block | |
70 | */ | |
71 | static int apparmor_cred_prepare(struct cred *new, const struct cred *old, | |
72 | gfp_t gfp) | |
73 | { | |
74 | /* freed by apparmor_cred_free */ | |
75 | struct aa_task_cxt *cxt = aa_alloc_task_context(gfp); | |
76 | if (!cxt) | |
77 | return -ENOMEM; | |
78 | ||
79 | aa_dup_task_context(cxt, old->security); | |
80 | new->security = cxt; | |
81 | return 0; | |
82 | } | |
83 | ||
84 | /* | |
85 | * transfer the apparmor data to a blank set of creds | |
86 | */ | |
87 | static void apparmor_cred_transfer(struct cred *new, const struct cred *old) | |
88 | { | |
89 | const struct aa_task_cxt *old_cxt = old->security; | |
90 | struct aa_task_cxt *new_cxt = new->security; | |
91 | ||
92 | aa_dup_task_context(new_cxt, old_cxt); | |
93 | } | |
94 | ||
95 | static int apparmor_ptrace_access_check(struct task_struct *child, | |
96 | unsigned int mode) | |
97 | { | |
98 | int error = cap_ptrace_access_check(child, mode); | |
99 | if (error) | |
100 | return error; | |
101 | ||
102 | return aa_ptrace(current, child, mode); | |
103 | } | |
104 | ||
105 | static int apparmor_ptrace_traceme(struct task_struct *parent) | |
106 | { | |
107 | int error = cap_ptrace_traceme(parent); | |
108 | if (error) | |
109 | return error; | |
110 | ||
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); | |
123 | profile = aa_cred_profile(cred); | |
124 | ||
125 | *effective = cred->cap_effective; | |
126 | *inheritable = cred->cap_inheritable; | |
127 | *permitted = cred->cap_permitted; | |
128 | ||
129 | if (!unconfined(profile)) { | |
130 | *effective = cap_intersect(*effective, profile->caps.allow); | |
131 | *permitted = cap_intersect(*permitted, profile->caps.allow); | |
132 | } | |
133 | rcu_read_unlock(); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int apparmor_capable(struct task_struct *task, const struct cred *cred, | |
139 | int cap, int audit) | |
140 | { | |
141 | struct aa_profile *profile; | |
142 | /* cap_capable returns 0 on success, else -EPERM */ | |
143 | int error = cap_capable(task, cred, cap, audit); | |
144 | if (!error) { | |
145 | profile = aa_cred_profile(cred); | |
146 | if (!unconfined(profile)) | |
147 | error = aa_capable(task, profile, cap, audit); | |
148 | } | |
149 | return error; | |
150 | } | |
151 | ||
152 | /** | |
153 | * common_perm - basic common permission check wrapper fn for paths | |
154 | * @op: operation being checked | |
155 | * @path: path to check permission of (NOT NULL) | |
156 | * @mask: requested permissions mask | |
157 | * @cond: conditional info for the permission request (NOT NULL) | |
158 | * | |
159 | * Returns: %0 else error code if error or permission denied | |
160 | */ | |
161 | static int common_perm(int op, struct path *path, u32 mask, | |
162 | struct path_cond *cond) | |
163 | { | |
164 | struct aa_profile *profile; | |
165 | int error = 0; | |
166 | ||
167 | profile = __aa_current_profile(); | |
168 | if (!unconfined(profile)) | |
169 | error = aa_path_perm(op, profile, path, 0, mask, cond); | |
170 | ||
171 | return error; | |
172 | } | |
173 | ||
174 | /** | |
175 | * common_perm_dir_dentry - common permission wrapper when path is dir, dentry | |
176 | * @op: operation being checked | |
177 | * @dir: directory of the dentry (NOT NULL) | |
178 | * @dentry: dentry to check (NOT NULL) | |
179 | * @mask: requested permissions mask | |
180 | * @cond: conditional info for the permission request (NOT NULL) | |
181 | * | |
182 | * Returns: %0 else error code if error or permission denied | |
183 | */ | |
184 | static int common_perm_dir_dentry(int op, struct path *dir, | |
185 | struct dentry *dentry, u32 mask, | |
186 | struct path_cond *cond) | |
187 | { | |
188 | struct path path = { dir->mnt, dentry }; | |
189 | ||
190 | return common_perm(op, &path, mask, cond); | |
191 | } | |
192 | ||
193 | /** | |
194 | * common_perm_mnt_dentry - common permission wrapper when mnt, dentry | |
195 | * @op: operation being checked | |
196 | * @mnt: mount point of dentry (NOT NULL) | |
197 | * @dentry: dentry to check (NOT NULL) | |
198 | * @mask: requested permissions mask | |
199 | * | |
200 | * Returns: %0 else error code if error or permission denied | |
201 | */ | |
202 | static int common_perm_mnt_dentry(int op, struct vfsmount *mnt, | |
203 | struct dentry *dentry, u32 mask) | |
204 | { | |
205 | struct path path = { mnt, dentry }; | |
206 | struct path_cond cond = { dentry->d_inode->i_uid, | |
207 | dentry->d_inode->i_mode | |
208 | }; | |
209 | ||
210 | return common_perm(op, &path, mask, &cond); | |
211 | } | |
212 | ||
213 | /** | |
214 | * common_perm_rm - common permission wrapper for operations doing rm | |
215 | * @op: operation being checked | |
216 | * @dir: directory that the dentry is in (NOT NULL) | |
217 | * @dentry: dentry being rm'd (NOT NULL) | |
218 | * @mask: requested permission mask | |
219 | * | |
220 | * Returns: %0 else error code if error or permission denied | |
221 | */ | |
222 | static int common_perm_rm(int op, struct path *dir, | |
223 | struct dentry *dentry, u32 mask) | |
224 | { | |
225 | struct inode *inode = dentry->d_inode; | |
226 | struct path_cond cond = { }; | |
227 | ||
228 | if (!inode || !dir->mnt || !mediated_filesystem(inode)) | |
229 | return 0; | |
230 | ||
231 | cond.uid = inode->i_uid; | |
232 | cond.mode = inode->i_mode; | |
233 | ||
234 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
235 | } | |
236 | ||
237 | /** | |
238 | * common_perm_create - common permission wrapper for operations doing create | |
239 | * @op: operation being checked | |
240 | * @dir: directory that dentry will be created in (NOT NULL) | |
241 | * @dentry: dentry to create (NOT NULL) | |
242 | * @mask: request permission mask | |
243 | * @mode: created file mode | |
244 | * | |
245 | * Returns: %0 else error code if error or permission denied | |
246 | */ | |
247 | static int common_perm_create(int op, struct path *dir, struct dentry *dentry, | |
248 | u32 mask, umode_t mode) | |
249 | { | |
250 | struct path_cond cond = { current_fsuid(), mode }; | |
251 | ||
252 | if (!dir->mnt || !mediated_filesystem(dir->dentry->d_inode)) | |
253 | return 0; | |
254 | ||
255 | return common_perm_dir_dentry(op, dir, dentry, mask, &cond); | |
256 | } | |
257 | ||
258 | static int apparmor_path_unlink(struct path *dir, struct dentry *dentry) | |
259 | { | |
260 | return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE); | |
261 | } | |
262 | ||
263 | static int apparmor_path_mkdir(struct path *dir, struct dentry *dentry, | |
264 | int mode) | |
265 | { | |
266 | return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE, | |
267 | S_IFDIR); | |
268 | } | |
269 | ||
270 | static int apparmor_path_rmdir(struct path *dir, struct dentry *dentry) | |
271 | { | |
272 | return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE); | |
273 | } | |
274 | ||
275 | static int apparmor_path_mknod(struct path *dir, struct dentry *dentry, | |
276 | int mode, unsigned int dev) | |
277 | { | |
278 | return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode); | |
279 | } | |
280 | ||
4d6ec10b | 281 | static int apparmor_path_truncate(struct path *path) |
b5e95b48 JJ |
282 | { |
283 | struct path_cond cond = { path->dentry->d_inode->i_uid, | |
284 | path->dentry->d_inode->i_mode | |
285 | }; | |
286 | ||
287 | if (!path->mnt || !mediated_filesystem(path->dentry->d_inode)) | |
288 | return 0; | |
289 | ||
290 | return common_perm(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE, | |
291 | &cond); | |
292 | } | |
293 | ||
294 | static int apparmor_path_symlink(struct path *dir, struct dentry *dentry, | |
295 | const char *old_name) | |
296 | { | |
297 | return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE, | |
298 | S_IFLNK); | |
299 | } | |
300 | ||
301 | static int apparmor_path_link(struct dentry *old_dentry, struct path *new_dir, | |
302 | struct dentry *new_dentry) | |
303 | { | |
304 | struct aa_profile *profile; | |
305 | int error = 0; | |
306 | ||
307 | if (!mediated_filesystem(old_dentry->d_inode)) | |
308 | return 0; | |
309 | ||
310 | profile = aa_current_profile(); | |
311 | if (!unconfined(profile)) | |
312 | error = aa_path_link(profile, old_dentry, new_dir, new_dentry); | |
313 | return error; | |
314 | } | |
315 | ||
316 | static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry, | |
317 | struct path *new_dir, struct dentry *new_dentry) | |
318 | { | |
319 | struct aa_profile *profile; | |
320 | int error = 0; | |
321 | ||
322 | if (!mediated_filesystem(old_dentry->d_inode)) | |
323 | return 0; | |
324 | ||
325 | profile = aa_current_profile(); | |
326 | if (!unconfined(profile)) { | |
327 | struct path old_path = { old_dir->mnt, old_dentry }; | |
328 | struct path new_path = { new_dir->mnt, new_dentry }; | |
329 | struct path_cond cond = { old_dentry->d_inode->i_uid, | |
330 | old_dentry->d_inode->i_mode | |
331 | }; | |
332 | ||
333 | error = aa_path_perm(OP_RENAME_SRC, profile, &old_path, 0, | |
334 | MAY_READ | AA_MAY_META_READ | MAY_WRITE | | |
335 | AA_MAY_META_WRITE | AA_MAY_DELETE, | |
336 | &cond); | |
337 | if (!error) | |
338 | error = aa_path_perm(OP_RENAME_DEST, profile, &new_path, | |
339 | 0, MAY_WRITE | AA_MAY_META_WRITE | | |
340 | AA_MAY_CREATE, &cond); | |
341 | ||
342 | } | |
343 | return error; | |
344 | } | |
345 | ||
346 | static int apparmor_path_chmod(struct dentry *dentry, struct vfsmount *mnt, | |
347 | mode_t mode) | |
348 | { | |
349 | if (!mediated_filesystem(dentry->d_inode)) | |
350 | return 0; | |
351 | ||
352 | return common_perm_mnt_dentry(OP_CHMOD, mnt, dentry, AA_MAY_CHMOD); | |
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; | |
595 | return aa_audit(AUDIT_APPARMOR_DENIED, NULL, GFP_KERNEL, | |
596 | &sa, NULL); | |
597 | } | |
598 | } else if (strcmp(name, "exec") == 0) { | |
599 | error = aa_setprocattr_changeprofile(args, AA_ONEXEC, | |
600 | !AA_DO_TEST); | |
601 | } else { | |
602 | /* only support the "current" and "exec" process attributes */ | |
603 | return -EINVAL; | |
604 | } | |
605 | if (!error) | |
606 | error = size; | |
607 | return error; | |
608 | } | |
609 | ||
7cb4dc9f JS |
610 | static int apparmor_task_setrlimit(struct task_struct *task, |
611 | unsigned int resource, struct rlimit *new_rlim) | |
b5e95b48 JJ |
612 | { |
613 | struct aa_profile *profile = aa_current_profile(); | |
614 | int error = 0; | |
615 | ||
616 | if (!unconfined(profile)) | |
3a2dc838 | 617 | error = aa_task_setrlimit(profile, task, resource, new_rlim); |
b5e95b48 JJ |
618 | |
619 | return error; | |
620 | } | |
621 | ||
622 | static struct security_operations apparmor_ops = { | |
623 | .name = "apparmor", | |
624 | ||
625 | .ptrace_access_check = apparmor_ptrace_access_check, | |
626 | .ptrace_traceme = apparmor_ptrace_traceme, | |
627 | .capget = apparmor_capget, | |
628 | .capable = apparmor_capable, | |
629 | ||
630 | .path_link = apparmor_path_link, | |
631 | .path_unlink = apparmor_path_unlink, | |
632 | .path_symlink = apparmor_path_symlink, | |
633 | .path_mkdir = apparmor_path_mkdir, | |
634 | .path_rmdir = apparmor_path_rmdir, | |
635 | .path_mknod = apparmor_path_mknod, | |
636 | .path_rename = apparmor_path_rename, | |
637 | .path_chmod = apparmor_path_chmod, | |
638 | .path_chown = apparmor_path_chown, | |
639 | .path_truncate = apparmor_path_truncate, | |
640 | .dentry_open = apparmor_dentry_open, | |
641 | .inode_getattr = apparmor_inode_getattr, | |
642 | ||
643 | .file_permission = apparmor_file_permission, | |
644 | .file_alloc_security = apparmor_file_alloc_security, | |
645 | .file_free_security = apparmor_file_free_security, | |
646 | .file_mmap = apparmor_file_mmap, | |
647 | .file_mprotect = apparmor_file_mprotect, | |
648 | .file_lock = apparmor_file_lock, | |
649 | ||
650 | .getprocattr = apparmor_getprocattr, | |
651 | .setprocattr = apparmor_setprocattr, | |
652 | ||
653 | .cred_alloc_blank = apparmor_cred_alloc_blank, | |
654 | .cred_free = apparmor_cred_free, | |
655 | .cred_prepare = apparmor_cred_prepare, | |
656 | .cred_transfer = apparmor_cred_transfer, | |
657 | ||
658 | .bprm_set_creds = apparmor_bprm_set_creds, | |
659 | .bprm_committing_creds = apparmor_bprm_committing_creds, | |
660 | .bprm_committed_creds = apparmor_bprm_committed_creds, | |
661 | .bprm_secureexec = apparmor_bprm_secureexec, | |
662 | ||
663 | .task_setrlimit = apparmor_task_setrlimit, | |
664 | }; | |
665 | ||
666 | /* | |
667 | * AppArmor sysfs module parameters | |
668 | */ | |
669 | ||
101d6c82 SR |
670 | static int param_set_aabool(const char *val, const struct kernel_param *kp); |
671 | static int param_get_aabool(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 672 | #define param_check_aabool(name, p) __param_check(name, p, int) |
101d6c82 SR |
673 | static struct kernel_param_ops param_ops_aabool = { |
674 | .set = param_set_aabool, | |
675 | .get = param_get_aabool | |
676 | }; | |
b5e95b48 | 677 | |
101d6c82 SR |
678 | static int param_set_aauint(const char *val, const struct kernel_param *kp); |
679 | static int param_get_aauint(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 680 | #define param_check_aauint(name, p) __param_check(name, p, int) |
101d6c82 SR |
681 | static struct kernel_param_ops param_ops_aauint = { |
682 | .set = param_set_aauint, | |
683 | .get = param_get_aauint | |
684 | }; | |
b5e95b48 | 685 | |
101d6c82 SR |
686 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp); |
687 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp); | |
b5e95b48 | 688 | #define param_check_aalockpolicy(name, p) __param_check(name, p, int) |
101d6c82 SR |
689 | static struct kernel_param_ops param_ops_aalockpolicy = { |
690 | .set = param_set_aalockpolicy, | |
691 | .get = param_get_aalockpolicy | |
692 | }; | |
b5e95b48 JJ |
693 | |
694 | static int param_set_audit(const char *val, struct kernel_param *kp); | |
695 | static int param_get_audit(char *buffer, struct kernel_param *kp); | |
696 | #define param_check_audit(name, p) __param_check(name, p, int) | |
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); | |
700 | #define param_check_mode(name, p) __param_check(name, p, int) | |
701 | ||
702 | /* Flag values, also controllable via /sys/module/apparmor/parameters | |
703 | * We define special types as we want to do additional mediation. | |
704 | */ | |
705 | ||
706 | /* AppArmor global enforcement switch - complain, enforce, kill */ | |
707 | enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE; | |
708 | module_param_call(mode, param_set_mode, param_get_mode, | |
709 | &aa_g_profile_mode, S_IRUSR | S_IWUSR); | |
710 | ||
711 | /* Debug mode */ | |
712 | int aa_g_debug; | |
713 | module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR); | |
714 | ||
715 | /* Audit mode */ | |
716 | enum audit_mode aa_g_audit; | |
717 | module_param_call(audit, param_set_audit, param_get_audit, | |
718 | &aa_g_audit, S_IRUSR | S_IWUSR); | |
719 | ||
720 | /* Determines if audit header is included in audited messages. This | |
721 | * provides more context if the audit daemon is not running | |
722 | */ | |
723 | int aa_g_audit_header = 1; | |
724 | module_param_named(audit_header, aa_g_audit_header, aabool, | |
725 | S_IRUSR | S_IWUSR); | |
726 | ||
727 | /* lock out loading/removal of policy | |
728 | * TODO: add in at boot loading of policy, which is the only way to | |
729 | * load policy, if lock_policy is set | |
730 | */ | |
731 | int aa_g_lock_policy; | |
732 | module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy, | |
733 | S_IRUSR | S_IWUSR); | |
734 | ||
735 | /* Syscall logging mode */ | |
736 | int aa_g_logsyscall; | |
737 | module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR); | |
738 | ||
739 | /* Maximum pathname length before accesses will start getting rejected */ | |
740 | unsigned int aa_g_path_max = 2 * PATH_MAX; | |
741 | module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR | S_IWUSR); | |
742 | ||
743 | /* Determines how paranoid loading of policy is and how much verification | |
744 | * on the loaded policy is done. | |
745 | */ | |
746 | int aa_g_paranoid_load = 1; | |
747 | module_param_named(paranoid_load, aa_g_paranoid_load, aabool, | |
748 | S_IRUSR | S_IWUSR); | |
749 | ||
750 | /* Boot time disable flag */ | |
751 | static unsigned int apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE; | |
752 | module_param_named(enabled, apparmor_enabled, aabool, S_IRUSR); | |
753 | ||
754 | static int __init apparmor_enabled_setup(char *str) | |
755 | { | |
756 | unsigned long enabled; | |
757 | int error = strict_strtoul(str, 0, &enabled); | |
758 | if (!error) | |
759 | apparmor_enabled = enabled ? 1 : 0; | |
760 | return 1; | |
761 | } | |
762 | ||
763 | __setup("apparmor=", apparmor_enabled_setup); | |
764 | ||
765 | /* set global flag turning off the ability to load policy */ | |
101d6c82 | 766 | static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
767 | { |
768 | if (!capable(CAP_MAC_ADMIN)) | |
769 | return -EPERM; | |
770 | if (aa_g_lock_policy) | |
771 | return -EACCES; | |
772 | return param_set_bool(val, kp); | |
773 | } | |
774 | ||
101d6c82 | 775 | static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp) |
b5e95b48 JJ |
776 | { |
777 | if (!capable(CAP_MAC_ADMIN)) | |
778 | return -EPERM; | |
779 | return param_get_bool(buffer, kp); | |
780 | } | |
781 | ||
101d6c82 | 782 | static int param_set_aabool(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
783 | { |
784 | if (!capable(CAP_MAC_ADMIN)) | |
785 | return -EPERM; | |
786 | return param_set_bool(val, kp); | |
787 | } | |
788 | ||
101d6c82 | 789 | static int param_get_aabool(char *buffer, const struct kernel_param *kp) |
b5e95b48 JJ |
790 | { |
791 | if (!capable(CAP_MAC_ADMIN)) | |
792 | return -EPERM; | |
793 | return param_get_bool(buffer, kp); | |
794 | } | |
795 | ||
101d6c82 | 796 | static int param_set_aauint(const char *val, const struct kernel_param *kp) |
b5e95b48 JJ |
797 | { |
798 | if (!capable(CAP_MAC_ADMIN)) | |
799 | return -EPERM; | |
800 | return param_set_uint(val, kp); | |
801 | } | |
802 | ||
101d6c82 | 803 | static int param_get_aauint(char *buffer, const struct kernel_param *kp) |
b5e95b48 JJ |
804 | { |
805 | if (!capable(CAP_MAC_ADMIN)) | |
806 | return -EPERM; | |
807 | return param_get_uint(buffer, kp); | |
808 | } | |
809 | ||
810 | static int param_get_audit(char *buffer, struct kernel_param *kp) | |
811 | { | |
812 | if (!capable(CAP_MAC_ADMIN)) | |
813 | return -EPERM; | |
814 | ||
815 | if (!apparmor_enabled) | |
816 | return -EINVAL; | |
817 | ||
818 | return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]); | |
819 | } | |
820 | ||
821 | static int param_set_audit(const char *val, struct kernel_param *kp) | |
822 | { | |
823 | int i; | |
824 | if (!capable(CAP_MAC_ADMIN)) | |
825 | return -EPERM; | |
826 | ||
827 | if (!apparmor_enabled) | |
828 | return -EINVAL; | |
829 | ||
830 | if (!val) | |
831 | return -EINVAL; | |
832 | ||
833 | for (i = 0; i < AUDIT_MAX_INDEX; i++) { | |
834 | if (strcmp(val, audit_mode_names[i]) == 0) { | |
835 | aa_g_audit = i; | |
836 | return 0; | |
837 | } | |
838 | } | |
839 | ||
840 | return -EINVAL; | |
841 | } | |
842 | ||
843 | static int param_get_mode(char *buffer, struct kernel_param *kp) | |
844 | { | |
845 | if (!capable(CAP_MAC_ADMIN)) | |
846 | return -EPERM; | |
847 | ||
848 | if (!apparmor_enabled) | |
849 | return -EINVAL; | |
850 | ||
851 | return sprintf(buffer, "%s", profile_mode_names[aa_g_profile_mode]); | |
852 | } | |
853 | ||
854 | static int param_set_mode(const char *val, struct kernel_param *kp) | |
855 | { | |
856 | int i; | |
857 | if (!capable(CAP_MAC_ADMIN)) | |
858 | return -EPERM; | |
859 | ||
860 | if (!apparmor_enabled) | |
861 | return -EINVAL; | |
862 | ||
863 | if (!val) | |
864 | return -EINVAL; | |
865 | ||
866 | for (i = 0; i < APPARMOR_NAMES_MAX_INDEX; i++) { | |
867 | if (strcmp(val, profile_mode_names[i]) == 0) { | |
868 | aa_g_profile_mode = i; | |
869 | return 0; | |
870 | } | |
871 | } | |
872 | ||
873 | return -EINVAL; | |
874 | } | |
875 | ||
876 | /* | |
877 | * AppArmor init functions | |
878 | */ | |
879 | ||
880 | /** | |
881 | * set_init_cxt - set a task context and profile on the first task. | |
882 | * | |
883 | * TODO: allow setting an alternate profile than unconfined | |
884 | */ | |
885 | static int __init set_init_cxt(void) | |
886 | { | |
887 | struct cred *cred = (struct cred *)current->real_cred; | |
888 | struct aa_task_cxt *cxt; | |
889 | ||
890 | cxt = aa_alloc_task_context(GFP_KERNEL); | |
891 | if (!cxt) | |
892 | return -ENOMEM; | |
893 | ||
894 | cxt->profile = aa_get_profile(root_ns->unconfined); | |
895 | cred->security = cxt; | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
900 | static int __init apparmor_init(void) | |
901 | { | |
902 | int error; | |
903 | ||
904 | if (!apparmor_enabled || !security_module_enable(&apparmor_ops)) { | |
905 | aa_info_message("AppArmor disabled by boot time parameter"); | |
906 | apparmor_enabled = 0; | |
907 | return 0; | |
908 | } | |
909 | ||
910 | error = aa_alloc_root_ns(); | |
911 | if (error) { | |
912 | AA_ERROR("Unable to allocate default profile namespace\n"); | |
913 | goto alloc_out; | |
914 | } | |
915 | ||
916 | error = set_init_cxt(); | |
917 | if (error) { | |
918 | AA_ERROR("Failed to set context on init task\n"); | |
919 | goto register_security_out; | |
920 | } | |
921 | ||
922 | error = register_security(&apparmor_ops); | |
923 | if (error) { | |
924 | AA_ERROR("Unable to register AppArmor\n"); | |
925 | goto register_security_out; | |
926 | } | |
927 | ||
928 | /* Report that AppArmor successfully initialized */ | |
929 | apparmor_initialized = 1; | |
930 | if (aa_g_profile_mode == APPARMOR_COMPLAIN) | |
931 | aa_info_message("AppArmor initialized: complain mode enabled"); | |
932 | else if (aa_g_profile_mode == APPARMOR_KILL) | |
933 | aa_info_message("AppArmor initialized: kill mode enabled"); | |
934 | else | |
935 | aa_info_message("AppArmor initialized"); | |
936 | ||
937 | return error; | |
938 | ||
939 | register_security_out: | |
940 | aa_free_root_ns(); | |
941 | ||
942 | alloc_out: | |
943 | aa_destroy_aafs(); | |
944 | ||
945 | apparmor_enabled = 0; | |
946 | return error; | |
947 | ||
948 | } | |
949 | ||
950 | security_initcall(apparmor_init); |