Commit | Line | Data |
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63e2b423 JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor /sys/kernel/security/apparmor interface functions | |
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 | ||
0d259f04 | 15 | #include <linux/ctype.h> |
63e2b423 JJ |
16 | #include <linux/security.h> |
17 | #include <linux/vmalloc.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/seq_file.h> | |
20 | #include <linux/uaccess.h> | |
21 | #include <linux/namei.h> | |
e74abcf3 | 22 | #include <linux/capability.h> |
29b3822f | 23 | #include <linux/rcupdate.h> |
63e2b423 JJ |
24 | |
25 | #include "include/apparmor.h" | |
26 | #include "include/apparmorfs.h" | |
27 | #include "include/audit.h" | |
28 | #include "include/context.h" | |
f8eb8a13 | 29 | #include "include/crypto.h" |
63e2b423 | 30 | #include "include/policy.h" |
d384b0a1 | 31 | #include "include/resource.h" |
63e2b423 | 32 | |
0d259f04 JJ |
33 | /** |
34 | * aa_mangle_name - mangle a profile name to std profile layout form | |
35 | * @name: profile name to mangle (NOT NULL) | |
36 | * @target: buffer to store mangled name, same length as @name (MAYBE NULL) | |
37 | * | |
38 | * Returns: length of mangled name | |
39 | */ | |
40 | static int mangle_name(char *name, char *target) | |
41 | { | |
42 | char *t = target; | |
43 | ||
44 | while (*name == '/' || *name == '.') | |
45 | name++; | |
46 | ||
47 | if (target) { | |
48 | for (; *name; name++) { | |
49 | if (*name == '/') | |
50 | *(t)++ = '.'; | |
51 | else if (isspace(*name)) | |
52 | *(t)++ = '_'; | |
53 | else if (isalnum(*name) || strchr("._-", *name)) | |
54 | *(t)++ = *name; | |
55 | } | |
56 | ||
57 | *t = 0; | |
58 | } else { | |
59 | int len = 0; | |
60 | for (; *name; name++) { | |
61 | if (isalnum(*name) || isspace(*name) || | |
62 | strchr("/._-", *name)) | |
63 | len++; | |
64 | } | |
65 | ||
66 | return len; | |
67 | } | |
68 | ||
69 | return t - target; | |
70 | } | |
71 | ||
63e2b423 JJ |
72 | /** |
73 | * aa_simple_write_to_buffer - common routine for getting policy from user | |
74 | * @op: operation doing the user buffer copy | |
75 | * @userbuf: user buffer to copy data from (NOT NULL) | |
3ed02ada | 76 | * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size) |
63e2b423 JJ |
77 | * @copy_size: size of data to copy from user buffer |
78 | * @pos: position write is at in the file (NOT NULL) | |
79 | * | |
80 | * Returns: kernel buffer containing copy of user buffer data or an | |
81 | * ERR_PTR on failure. | |
82 | */ | |
83 | static char *aa_simple_write_to_buffer(int op, const char __user *userbuf, | |
84 | size_t alloc_size, size_t copy_size, | |
85 | loff_t *pos) | |
86 | { | |
87 | char *data; | |
88 | ||
3ed02ada JJ |
89 | BUG_ON(copy_size > alloc_size); |
90 | ||
63e2b423 JJ |
91 | if (*pos != 0) |
92 | /* only writes from pos 0, that is complete writes */ | |
93 | return ERR_PTR(-ESPIPE); | |
94 | ||
95 | /* | |
96 | * Don't allow profile load/replace/remove from profiles that don't | |
97 | * have CAP_MAC_ADMIN | |
98 | */ | |
99 | if (!aa_may_manage_policy(op)) | |
100 | return ERR_PTR(-EACCES); | |
101 | ||
102 | /* freed by caller to simple_write_to_buffer */ | |
103 | data = kvmalloc(alloc_size); | |
104 | if (data == NULL) | |
105 | return ERR_PTR(-ENOMEM); | |
106 | ||
107 | if (copy_from_user(data, userbuf, copy_size)) { | |
108 | kvfree(data); | |
109 | return ERR_PTR(-EFAULT); | |
110 | } | |
111 | ||
112 | return data; | |
113 | } | |
114 | ||
115 | ||
116 | /* .load file hook fn to load policy */ | |
117 | static ssize_t profile_load(struct file *f, const char __user *buf, size_t size, | |
118 | loff_t *pos) | |
119 | { | |
120 | char *data; | |
121 | ssize_t error; | |
122 | ||
123 | data = aa_simple_write_to_buffer(OP_PROF_LOAD, buf, size, size, pos); | |
124 | ||
125 | error = PTR_ERR(data); | |
126 | if (!IS_ERR(data)) { | |
127 | error = aa_replace_profiles(data, size, PROF_ADD); | |
128 | kvfree(data); | |
129 | } | |
130 | ||
131 | return error; | |
132 | } | |
133 | ||
134 | static const struct file_operations aa_fs_profile_load = { | |
6038f373 AB |
135 | .write = profile_load, |
136 | .llseek = default_llseek, | |
63e2b423 JJ |
137 | }; |
138 | ||
139 | /* .replace file hook fn to load and/or replace policy */ | |
140 | static ssize_t profile_replace(struct file *f, const char __user *buf, | |
141 | size_t size, loff_t *pos) | |
142 | { | |
143 | char *data; | |
144 | ssize_t error; | |
145 | ||
146 | data = aa_simple_write_to_buffer(OP_PROF_REPL, buf, size, size, pos); | |
147 | error = PTR_ERR(data); | |
148 | if (!IS_ERR(data)) { | |
149 | error = aa_replace_profiles(data, size, PROF_REPLACE); | |
150 | kvfree(data); | |
151 | } | |
152 | ||
153 | return error; | |
154 | } | |
155 | ||
156 | static const struct file_operations aa_fs_profile_replace = { | |
6038f373 AB |
157 | .write = profile_replace, |
158 | .llseek = default_llseek, | |
63e2b423 JJ |
159 | }; |
160 | ||
161 | /* .remove file hook fn to remove loaded policy */ | |
162 | static ssize_t profile_remove(struct file *f, const char __user *buf, | |
163 | size_t size, loff_t *pos) | |
164 | { | |
165 | char *data; | |
166 | ssize_t error; | |
167 | ||
168 | /* | |
169 | * aa_remove_profile needs a null terminated string so 1 extra | |
170 | * byte is allocated and the copied data is null terminated. | |
171 | */ | |
172 | data = aa_simple_write_to_buffer(OP_PROF_RM, buf, size + 1, size, pos); | |
173 | ||
174 | error = PTR_ERR(data); | |
175 | if (!IS_ERR(data)) { | |
176 | data[size] = 0; | |
177 | error = aa_remove_profiles(data, size); | |
178 | kvfree(data); | |
179 | } | |
180 | ||
181 | return error; | |
182 | } | |
183 | ||
184 | static const struct file_operations aa_fs_profile_remove = { | |
6038f373 AB |
185 | .write = profile_remove, |
186 | .llseek = default_llseek, | |
63e2b423 JJ |
187 | }; |
188 | ||
e74abcf3 KC |
189 | static int aa_fs_seq_show(struct seq_file *seq, void *v) |
190 | { | |
191 | struct aa_fs_entry *fs_file = seq->private; | |
192 | ||
193 | if (!fs_file) | |
194 | return 0; | |
195 | ||
196 | switch (fs_file->v_type) { | |
197 | case AA_FS_TYPE_BOOLEAN: | |
198 | seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no"); | |
199 | break; | |
a9bf8e9f KC |
200 | case AA_FS_TYPE_STRING: |
201 | seq_printf(seq, "%s\n", fs_file->v.string); | |
202 | break; | |
e74abcf3 KC |
203 | case AA_FS_TYPE_U64: |
204 | seq_printf(seq, "%#08lx\n", fs_file->v.u64); | |
205 | break; | |
206 | default: | |
207 | /* Ignore unpritable entry types. */ | |
208 | break; | |
209 | } | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static int aa_fs_seq_open(struct inode *inode, struct file *file) | |
215 | { | |
216 | return single_open(file, aa_fs_seq_show, inode->i_private); | |
217 | } | |
218 | ||
219 | const struct file_operations aa_fs_seq_file_ops = { | |
220 | .owner = THIS_MODULE, | |
221 | .open = aa_fs_seq_open, | |
222 | .read = seq_read, | |
223 | .llseek = seq_lseek, | |
224 | .release = single_release, | |
225 | }; | |
226 | ||
0d259f04 JJ |
227 | static int aa_fs_seq_profile_open(struct inode *inode, struct file *file, |
228 | int (*show)(struct seq_file *, void *)) | |
229 | { | |
230 | struct aa_replacedby *r = aa_get_replacedby(inode->i_private); | |
231 | int error = single_open(file, show, r); | |
232 | ||
233 | if (error) { | |
234 | file->private_data = NULL; | |
235 | aa_put_replacedby(r); | |
236 | } | |
237 | ||
238 | return error; | |
239 | } | |
240 | ||
241 | static int aa_fs_seq_profile_release(struct inode *inode, struct file *file) | |
242 | { | |
243 | struct seq_file *seq = (struct seq_file *) file->private_data; | |
244 | if (seq) | |
245 | aa_put_replacedby(seq->private); | |
246 | return single_release(inode, file); | |
247 | } | |
248 | ||
249 | static int aa_fs_seq_profname_show(struct seq_file *seq, void *v) | |
250 | { | |
251 | struct aa_replacedby *r = seq->private; | |
252 | struct aa_profile *profile = aa_get_profile_rcu(&r->profile); | |
253 | seq_printf(seq, "%s\n", profile->base.name); | |
254 | aa_put_profile(profile); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static int aa_fs_seq_profname_open(struct inode *inode, struct file *file) | |
260 | { | |
261 | return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profname_show); | |
262 | } | |
263 | ||
264 | static const struct file_operations aa_fs_profname_fops = { | |
265 | .owner = THIS_MODULE, | |
266 | .open = aa_fs_seq_profname_open, | |
267 | .read = seq_read, | |
268 | .llseek = seq_lseek, | |
269 | .release = aa_fs_seq_profile_release, | |
270 | }; | |
271 | ||
272 | static int aa_fs_seq_profmode_show(struct seq_file *seq, void *v) | |
273 | { | |
274 | struct aa_replacedby *r = seq->private; | |
275 | struct aa_profile *profile = aa_get_profile_rcu(&r->profile); | |
276 | seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]); | |
277 | aa_put_profile(profile); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static int aa_fs_seq_profmode_open(struct inode *inode, struct file *file) | |
283 | { | |
284 | return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profmode_show); | |
285 | } | |
286 | ||
287 | static const struct file_operations aa_fs_profmode_fops = { | |
288 | .owner = THIS_MODULE, | |
289 | .open = aa_fs_seq_profmode_open, | |
290 | .read = seq_read, | |
291 | .llseek = seq_lseek, | |
292 | .release = aa_fs_seq_profile_release, | |
293 | }; | |
294 | ||
556d0be7 JJ |
295 | static int aa_fs_seq_profattach_show(struct seq_file *seq, void *v) |
296 | { | |
297 | struct aa_replacedby *r = seq->private; | |
298 | struct aa_profile *profile = aa_get_profile_rcu(&r->profile); | |
299 | if (profile->attach) | |
300 | seq_printf(seq, "%s\n", profile->attach); | |
301 | else if (profile->xmatch) | |
302 | seq_puts(seq, "<unknown>\n"); | |
303 | else | |
304 | seq_printf(seq, "%s\n", profile->base.name); | |
305 | aa_put_profile(profile); | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static int aa_fs_seq_profattach_open(struct inode *inode, struct file *file) | |
311 | { | |
312 | return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profattach_show); | |
313 | } | |
314 | ||
315 | static const struct file_operations aa_fs_profattach_fops = { | |
316 | .owner = THIS_MODULE, | |
317 | .open = aa_fs_seq_profattach_open, | |
318 | .read = seq_read, | |
319 | .llseek = seq_lseek, | |
320 | .release = aa_fs_seq_profile_release, | |
321 | }; | |
322 | ||
f8eb8a13 JJ |
323 | static int aa_fs_seq_hash_show(struct seq_file *seq, void *v) |
324 | { | |
325 | struct aa_replacedby *r = seq->private; | |
326 | struct aa_profile *profile = aa_get_profile_rcu(&r->profile); | |
327 | unsigned int i, size = aa_hash_size(); | |
328 | ||
329 | if (profile->hash) { | |
330 | for (i = 0; i < size; i++) | |
331 | seq_printf(seq, "%.2x", profile->hash[i]); | |
332 | seq_puts(seq, "\n"); | |
333 | } | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | static int aa_fs_seq_hash_open(struct inode *inode, struct file *file) | |
339 | { | |
340 | return single_open(file, aa_fs_seq_hash_show, inode->i_private); | |
341 | } | |
342 | ||
343 | static const struct file_operations aa_fs_seq_hash_fops = { | |
344 | .owner = THIS_MODULE, | |
345 | .open = aa_fs_seq_hash_open, | |
346 | .read = seq_read, | |
347 | .llseek = seq_lseek, | |
348 | .release = single_release, | |
349 | }; | |
350 | ||
0d259f04 JJ |
351 | /** fns to setup dynamic per profile/namespace files **/ |
352 | void __aa_fs_profile_rmdir(struct aa_profile *profile) | |
353 | { | |
354 | struct aa_profile *child; | |
355 | int i; | |
356 | ||
357 | if (!profile) | |
358 | return; | |
359 | ||
360 | list_for_each_entry(child, &profile->base.profiles, base.list) | |
361 | __aa_fs_profile_rmdir(child); | |
362 | ||
363 | for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) { | |
364 | struct aa_replacedby *r; | |
365 | if (!profile->dents[i]) | |
366 | continue; | |
367 | ||
368 | r = profile->dents[i]->d_inode->i_private; | |
369 | securityfs_remove(profile->dents[i]); | |
370 | aa_put_replacedby(r); | |
371 | profile->dents[i] = NULL; | |
372 | } | |
373 | } | |
374 | ||
375 | void __aa_fs_profile_migrate_dents(struct aa_profile *old, | |
376 | struct aa_profile *new) | |
377 | { | |
378 | int i; | |
379 | ||
380 | for (i = 0; i < AAFS_PROF_SIZEOF; i++) { | |
381 | new->dents[i] = old->dents[i]; | |
382 | old->dents[i] = NULL; | |
383 | } | |
384 | } | |
385 | ||
386 | static struct dentry *create_profile_file(struct dentry *dir, const char *name, | |
387 | struct aa_profile *profile, | |
388 | const struct file_operations *fops) | |
389 | { | |
390 | struct aa_replacedby *r = aa_get_replacedby(profile->replacedby); | |
391 | struct dentry *dent; | |
392 | ||
393 | dent = securityfs_create_file(name, S_IFREG | 0444, dir, r, fops); | |
394 | if (IS_ERR(dent)) | |
395 | aa_put_replacedby(r); | |
396 | ||
397 | return dent; | |
398 | } | |
399 | ||
400 | /* requires lock be held */ | |
401 | int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent) | |
402 | { | |
403 | struct aa_profile *child; | |
404 | struct dentry *dent = NULL, *dir; | |
405 | int error; | |
406 | ||
407 | if (!parent) { | |
408 | struct aa_profile *p; | |
409 | p = aa_deref_parent(profile); | |
410 | dent = prof_dir(p); | |
411 | /* adding to parent that previously didn't have children */ | |
412 | dent = securityfs_create_dir("profiles", dent); | |
413 | if (IS_ERR(dent)) | |
414 | goto fail; | |
415 | prof_child_dir(p) = parent = dent; | |
416 | } | |
417 | ||
418 | if (!profile->dirname) { | |
419 | int len, id_len; | |
420 | len = mangle_name(profile->base.name, NULL); | |
421 | id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id); | |
422 | ||
423 | profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL); | |
424 | if (!profile->dirname) | |
425 | goto fail; | |
426 | ||
427 | mangle_name(profile->base.name, profile->dirname); | |
428 | sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++); | |
429 | } | |
430 | ||
431 | dent = securityfs_create_dir(profile->dirname, parent); | |
432 | if (IS_ERR(dent)) | |
433 | goto fail; | |
434 | prof_dir(profile) = dir = dent; | |
435 | ||
436 | dent = create_profile_file(dir, "name", profile, &aa_fs_profname_fops); | |
437 | if (IS_ERR(dent)) | |
438 | goto fail; | |
439 | profile->dents[AAFS_PROF_NAME] = dent; | |
440 | ||
441 | dent = create_profile_file(dir, "mode", profile, &aa_fs_profmode_fops); | |
442 | if (IS_ERR(dent)) | |
443 | goto fail; | |
444 | profile->dents[AAFS_PROF_MODE] = dent; | |
445 | ||
556d0be7 JJ |
446 | dent = create_profile_file(dir, "attach", profile, |
447 | &aa_fs_profattach_fops); | |
448 | if (IS_ERR(dent)) | |
449 | goto fail; | |
450 | profile->dents[AAFS_PROF_ATTACH] = dent; | |
451 | ||
f8eb8a13 JJ |
452 | if (profile->hash) { |
453 | dent = create_profile_file(dir, "sha1", profile, | |
454 | &aa_fs_seq_hash_fops); | |
455 | if (IS_ERR(dent)) | |
456 | goto fail; | |
457 | profile->dents[AAFS_PROF_HASH] = dent; | |
458 | } | |
459 | ||
0d259f04 JJ |
460 | list_for_each_entry(child, &profile->base.profiles, base.list) { |
461 | error = __aa_fs_profile_mkdir(child, prof_child_dir(profile)); | |
462 | if (error) | |
463 | goto fail2; | |
464 | } | |
465 | ||
466 | return 0; | |
467 | ||
468 | fail: | |
469 | error = PTR_ERR(dent); | |
470 | ||
471 | fail2: | |
472 | __aa_fs_profile_rmdir(profile); | |
473 | ||
474 | return error; | |
475 | } | |
476 | ||
477 | void __aa_fs_namespace_rmdir(struct aa_namespace *ns) | |
478 | { | |
479 | struct aa_namespace *sub; | |
480 | struct aa_profile *child; | |
481 | int i; | |
482 | ||
483 | if (!ns) | |
484 | return; | |
485 | ||
486 | list_for_each_entry(child, &ns->base.profiles, base.list) | |
487 | __aa_fs_profile_rmdir(child); | |
488 | ||
489 | list_for_each_entry(sub, &ns->sub_ns, base.list) { | |
490 | mutex_lock(&sub->lock); | |
491 | __aa_fs_namespace_rmdir(sub); | |
492 | mutex_unlock(&sub->lock); | |
493 | } | |
494 | ||
495 | for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) { | |
496 | securityfs_remove(ns->dents[i]); | |
497 | ns->dents[i] = NULL; | |
498 | } | |
499 | } | |
500 | ||
501 | int __aa_fs_namespace_mkdir(struct aa_namespace *ns, struct dentry *parent, | |
502 | const char *name) | |
503 | { | |
504 | struct aa_namespace *sub; | |
505 | struct aa_profile *child; | |
506 | struct dentry *dent, *dir; | |
507 | int error; | |
508 | ||
509 | if (!name) | |
510 | name = ns->base.name; | |
511 | ||
512 | dent = securityfs_create_dir(name, parent); | |
513 | if (IS_ERR(dent)) | |
514 | goto fail; | |
515 | ns_dir(ns) = dir = dent; | |
516 | ||
517 | dent = securityfs_create_dir("profiles", dir); | |
518 | if (IS_ERR(dent)) | |
519 | goto fail; | |
520 | ns_subprofs_dir(ns) = dent; | |
63e2b423 | 521 | |
0d259f04 JJ |
522 | dent = securityfs_create_dir("namespaces", dir); |
523 | if (IS_ERR(dent)) | |
524 | goto fail; | |
525 | ns_subns_dir(ns) = dent; | |
526 | ||
527 | list_for_each_entry(child, &ns->base.profiles, base.list) { | |
528 | error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns)); | |
529 | if (error) | |
530 | goto fail2; | |
531 | } | |
532 | ||
533 | list_for_each_entry(sub, &ns->sub_ns, base.list) { | |
534 | mutex_lock(&sub->lock); | |
535 | error = __aa_fs_namespace_mkdir(sub, ns_subns_dir(ns), NULL); | |
536 | mutex_unlock(&sub->lock); | |
537 | if (error) | |
538 | goto fail2; | |
539 | } | |
540 | ||
541 | return 0; | |
542 | ||
543 | fail: | |
544 | error = PTR_ERR(dent); | |
545 | ||
546 | fail2: | |
547 | __aa_fs_namespace_rmdir(ns); | |
548 | ||
549 | return error; | |
550 | } | |
551 | ||
552 | ||
29b3822f JJ |
553 | #define list_entry_next(pos, member) \ |
554 | list_entry(pos->member.next, typeof(*pos), member) | |
555 | #define list_entry_is_head(pos, head, member) (&pos->member == (head)) | |
556 | ||
557 | /** | |
558 | * __next_namespace - find the next namespace to list | |
559 | * @root: root namespace to stop search at (NOT NULL) | |
560 | * @ns: current ns position (NOT NULL) | |
561 | * | |
562 | * Find the next namespace from @ns under @root and handle all locking needed | |
563 | * while switching current namespace. | |
564 | * | |
565 | * Returns: next namespace or NULL if at last namespace under @root | |
566 | * Requires: ns->parent->lock to be held | |
567 | * NOTE: will not unlock root->lock | |
568 | */ | |
569 | static struct aa_namespace *__next_namespace(struct aa_namespace *root, | |
570 | struct aa_namespace *ns) | |
571 | { | |
572 | struct aa_namespace *parent, *next; | |
573 | ||
574 | /* is next namespace a child */ | |
575 | if (!list_empty(&ns->sub_ns)) { | |
576 | next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list); | |
577 | mutex_lock(&next->lock); | |
578 | return next; | |
579 | } | |
580 | ||
581 | /* check if the next ns is a sibling, parent, gp, .. */ | |
582 | parent = ns->parent; | |
ed2c7da3 | 583 | while (ns != root) { |
29b3822f JJ |
584 | mutex_unlock(&ns->lock); |
585 | next = list_entry_next(ns, base.list); | |
586 | if (!list_entry_is_head(next, &parent->sub_ns, base.list)) { | |
587 | mutex_lock(&next->lock); | |
588 | return next; | |
589 | } | |
29b3822f JJ |
590 | ns = parent; |
591 | parent = parent->parent; | |
592 | } | |
593 | ||
594 | return NULL; | |
595 | } | |
596 | ||
597 | /** | |
598 | * __first_profile - find the first profile in a namespace | |
599 | * @root: namespace that is root of profiles being displayed (NOT NULL) | |
600 | * @ns: namespace to start in (NOT NULL) | |
601 | * | |
602 | * Returns: unrefcounted profile or NULL if no profile | |
603 | * Requires: profile->ns.lock to be held | |
604 | */ | |
605 | static struct aa_profile *__first_profile(struct aa_namespace *root, | |
606 | struct aa_namespace *ns) | |
607 | { | |
608 | for (; ns; ns = __next_namespace(root, ns)) { | |
609 | if (!list_empty(&ns->base.profiles)) | |
610 | return list_first_entry(&ns->base.profiles, | |
611 | struct aa_profile, base.list); | |
612 | } | |
613 | return NULL; | |
614 | } | |
615 | ||
616 | /** | |
617 | * __next_profile - step to the next profile in a profile tree | |
618 | * @profile: current profile in tree (NOT NULL) | |
619 | * | |
620 | * Perform a depth first traversal on the profile tree in a namespace | |
621 | * | |
622 | * Returns: next profile or NULL if done | |
623 | * Requires: profile->ns.lock to be held | |
624 | */ | |
625 | static struct aa_profile *__next_profile(struct aa_profile *p) | |
626 | { | |
627 | struct aa_profile *parent; | |
628 | struct aa_namespace *ns = p->ns; | |
629 | ||
630 | /* is next profile a child */ | |
631 | if (!list_empty(&p->base.profiles)) | |
632 | return list_first_entry(&p->base.profiles, typeof(*p), | |
633 | base.list); | |
634 | ||
635 | /* is next profile a sibling, parent sibling, gp, sibling, .. */ | |
636 | parent = rcu_dereference_protected(p->parent, | |
637 | mutex_is_locked(&p->ns->lock)); | |
638 | while (parent) { | |
639 | p = list_entry_next(p, base.list); | |
640 | if (!list_entry_is_head(p, &parent->base.profiles, base.list)) | |
641 | return p; | |
642 | p = parent; | |
643 | parent = rcu_dereference_protected(parent->parent, | |
644 | mutex_is_locked(&parent->ns->lock)); | |
645 | } | |
646 | ||
647 | /* is next another profile in the namespace */ | |
648 | p = list_entry_next(p, base.list); | |
649 | if (!list_entry_is_head(p, &ns->base.profiles, base.list)) | |
650 | return p; | |
651 | ||
652 | return NULL; | |
653 | } | |
654 | ||
655 | /** | |
656 | * next_profile - step to the next profile in where ever it may be | |
657 | * @root: root namespace (NOT NULL) | |
658 | * @profile: current profile (NOT NULL) | |
659 | * | |
660 | * Returns: next profile or NULL if there isn't one | |
661 | */ | |
662 | static struct aa_profile *next_profile(struct aa_namespace *root, | |
663 | struct aa_profile *profile) | |
664 | { | |
665 | struct aa_profile *next = __next_profile(profile); | |
666 | if (next) | |
667 | return next; | |
668 | ||
669 | /* finished all profiles in namespace move to next namespace */ | |
670 | return __first_profile(root, __next_namespace(root, profile->ns)); | |
671 | } | |
672 | ||
673 | /** | |
674 | * p_start - start a depth first traversal of profile tree | |
675 | * @f: seq_file to fill | |
676 | * @pos: current position | |
677 | * | |
678 | * Returns: first profile under current namespace or NULL if none found | |
679 | * | |
680 | * acquires first ns->lock | |
681 | */ | |
682 | static void *p_start(struct seq_file *f, loff_t *pos) | |
683 | { | |
684 | struct aa_profile *profile = NULL; | |
685 | struct aa_namespace *root = aa_current_profile()->ns; | |
686 | loff_t l = *pos; | |
687 | f->private = aa_get_namespace(root); | |
688 | ||
689 | ||
690 | /* find the first profile */ | |
691 | mutex_lock(&root->lock); | |
692 | profile = __first_profile(root, root); | |
693 | ||
694 | /* skip to position */ | |
695 | for (; profile && l > 0; l--) | |
696 | profile = next_profile(root, profile); | |
697 | ||
698 | return profile; | |
699 | } | |
700 | ||
701 | /** | |
702 | * p_next - read the next profile entry | |
703 | * @f: seq_file to fill | |
704 | * @p: profile previously returned | |
705 | * @pos: current position | |
706 | * | |
707 | * Returns: next profile after @p or NULL if none | |
708 | * | |
709 | * may acquire/release locks in namespace tree as necessary | |
710 | */ | |
711 | static void *p_next(struct seq_file *f, void *p, loff_t *pos) | |
712 | { | |
713 | struct aa_profile *profile = p; | |
714 | struct aa_namespace *ns = f->private; | |
715 | (*pos)++; | |
716 | ||
717 | return next_profile(ns, profile); | |
718 | } | |
719 | ||
720 | /** | |
721 | * p_stop - stop depth first traversal | |
722 | * @f: seq_file we are filling | |
723 | * @p: the last profile writen | |
724 | * | |
725 | * Release all locking done by p_start/p_next on namespace tree | |
726 | */ | |
727 | static void p_stop(struct seq_file *f, void *p) | |
728 | { | |
729 | struct aa_profile *profile = p; | |
730 | struct aa_namespace *root = f->private, *ns; | |
731 | ||
732 | if (profile) { | |
733 | for (ns = profile->ns; ns && ns != root; ns = ns->parent) | |
734 | mutex_unlock(&ns->lock); | |
735 | } | |
736 | mutex_unlock(&root->lock); | |
737 | aa_put_namespace(root); | |
738 | } | |
739 | ||
740 | /** | |
741 | * seq_show_profile - show a profile entry | |
742 | * @f: seq_file to file | |
743 | * @p: current position (profile) (NOT NULL) | |
744 | * | |
745 | * Returns: error on failure | |
746 | */ | |
747 | static int seq_show_profile(struct seq_file *f, void *p) | |
748 | { | |
749 | struct aa_profile *profile = (struct aa_profile *)p; | |
750 | struct aa_namespace *root = f->private; | |
751 | ||
752 | if (profile->ns != root) | |
753 | seq_printf(f, ":%s://", aa_ns_name(root, profile->ns)); | |
754 | seq_printf(f, "%s (%s)\n", profile->base.hname, | |
755 | aa_profile_mode_names[profile->mode]); | |
756 | ||
757 | return 0; | |
758 | } | |
759 | ||
760 | static const struct seq_operations aa_fs_profiles_op = { | |
761 | .start = p_start, | |
762 | .next = p_next, | |
763 | .stop = p_stop, | |
764 | .show = seq_show_profile, | |
765 | }; | |
766 | ||
767 | static int profiles_open(struct inode *inode, struct file *file) | |
768 | { | |
769 | return seq_open(file, &aa_fs_profiles_op); | |
770 | } | |
771 | ||
772 | static int profiles_release(struct inode *inode, struct file *file) | |
773 | { | |
774 | return seq_release(inode, file); | |
775 | } | |
776 | ||
777 | static const struct file_operations aa_fs_profiles_fops = { | |
778 | .open = profiles_open, | |
779 | .read = seq_read, | |
780 | .llseek = seq_lseek, | |
781 | .release = profiles_release, | |
782 | }; | |
783 | ||
784 | ||
0d259f04 | 785 | /** Base file system setup **/ |
a9bf8e9f KC |
786 | static struct aa_fs_entry aa_fs_entry_file[] = { |
787 | AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \ | |
788 | "link lock"), | |
789 | { } | |
790 | }; | |
791 | ||
e74abcf3 KC |
792 | static struct aa_fs_entry aa_fs_entry_domain[] = { |
793 | AA_FS_FILE_BOOLEAN("change_hat", 1), | |
794 | AA_FS_FILE_BOOLEAN("change_hatv", 1), | |
795 | AA_FS_FILE_BOOLEAN("change_onexec", 1), | |
796 | AA_FS_FILE_BOOLEAN("change_profile", 1), | |
797 | { } | |
798 | }; | |
799 | ||
9d910a3b | 800 | static struct aa_fs_entry aa_fs_entry_policy[] = { |
dd51c848 | 801 | AA_FS_FILE_BOOLEAN("set_load", 1), |
9d910a3b JJ |
802 | {} |
803 | }; | |
804 | ||
e74abcf3 | 805 | static struct aa_fs_entry aa_fs_entry_features[] = { |
9d910a3b | 806 | AA_FS_DIR("policy", aa_fs_entry_policy), |
e74abcf3 | 807 | AA_FS_DIR("domain", aa_fs_entry_domain), |
a9bf8e9f | 808 | AA_FS_DIR("file", aa_fs_entry_file), |
e74abcf3 | 809 | AA_FS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), |
d384b0a1 | 810 | AA_FS_DIR("rlimit", aa_fs_entry_rlimit), |
84f1f787 | 811 | AA_FS_DIR("caps", aa_fs_entry_caps), |
e74abcf3 KC |
812 | { } |
813 | }; | |
814 | ||
9acd494b KC |
815 | static struct aa_fs_entry aa_fs_entry_apparmor[] = { |
816 | AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load), | |
817 | AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace), | |
818 | AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove), | |
29b3822f | 819 | AA_FS_FILE_FOPS("profiles", 0640, &aa_fs_profiles_fops), |
e74abcf3 | 820 | AA_FS_DIR("features", aa_fs_entry_features), |
9acd494b KC |
821 | { } |
822 | }; | |
63e2b423 | 823 | |
9acd494b KC |
824 | static struct aa_fs_entry aa_fs_entry = |
825 | AA_FS_DIR("apparmor", aa_fs_entry_apparmor); | |
63e2b423 | 826 | |
9acd494b KC |
827 | /** |
828 | * aafs_create_file - create a file entry in the apparmor securityfs | |
829 | * @fs_file: aa_fs_entry to build an entry for (NOT NULL) | |
830 | * @parent: the parent dentry in the securityfs | |
831 | * | |
832 | * Use aafs_remove_file to remove entries created with this fn. | |
833 | */ | |
834 | static int __init aafs_create_file(struct aa_fs_entry *fs_file, | |
835 | struct dentry *parent) | |
836 | { | |
837 | int error = 0; | |
838 | ||
839 | fs_file->dentry = securityfs_create_file(fs_file->name, | |
840 | S_IFREG | fs_file->mode, | |
841 | parent, fs_file, | |
842 | fs_file->file_ops); | |
843 | if (IS_ERR(fs_file->dentry)) { | |
844 | error = PTR_ERR(fs_file->dentry); | |
845 | fs_file->dentry = NULL; | |
63e2b423 | 846 | } |
9acd494b | 847 | return error; |
63e2b423 JJ |
848 | } |
849 | ||
0d259f04 | 850 | static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir); |
63e2b423 | 851 | /** |
9acd494b KC |
852 | * aafs_create_dir - recursively create a directory entry in the securityfs |
853 | * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL) | |
854 | * @parent: the parent dentry in the securityfs | |
63e2b423 | 855 | * |
9acd494b | 856 | * Use aafs_remove_dir to remove entries created with this fn. |
63e2b423 | 857 | */ |
9acd494b KC |
858 | static int __init aafs_create_dir(struct aa_fs_entry *fs_dir, |
859 | struct dentry *parent) | |
63e2b423 | 860 | { |
9acd494b | 861 | struct aa_fs_entry *fs_file; |
0d259f04 JJ |
862 | struct dentry *dir; |
863 | int error; | |
63e2b423 | 864 | |
0d259f04 JJ |
865 | dir = securityfs_create_dir(fs_dir->name, parent); |
866 | if (IS_ERR(dir)) | |
867 | return PTR_ERR(dir); | |
868 | fs_dir->dentry = dir; | |
63e2b423 | 869 | |
0d259f04 | 870 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
9acd494b KC |
871 | if (fs_file->v_type == AA_FS_TYPE_DIR) |
872 | error = aafs_create_dir(fs_file, fs_dir->dentry); | |
873 | else | |
874 | error = aafs_create_file(fs_file, fs_dir->dentry); | |
875 | if (error) | |
876 | goto failed; | |
877 | } | |
878 | ||
879 | return 0; | |
880 | ||
881 | failed: | |
0d259f04 JJ |
882 | aafs_remove_dir(fs_dir); |
883 | ||
9acd494b KC |
884 | return error; |
885 | } | |
886 | ||
887 | /** | |
888 | * aafs_remove_file - drop a single file entry in the apparmor securityfs | |
889 | * @fs_file: aa_fs_entry to detach from the securityfs (NOT NULL) | |
890 | */ | |
891 | static void __init aafs_remove_file(struct aa_fs_entry *fs_file) | |
892 | { | |
893 | if (!fs_file->dentry) | |
894 | return; | |
895 | ||
896 | securityfs_remove(fs_file->dentry); | |
897 | fs_file->dentry = NULL; | |
898 | } | |
899 | ||
900 | /** | |
901 | * aafs_remove_dir - recursively drop a directory entry from the securityfs | |
902 | * @fs_dir: aa_fs_entry (and all child entries) to detach (NOT NULL) | |
903 | */ | |
904 | static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir) | |
905 | { | |
906 | struct aa_fs_entry *fs_file; | |
907 | ||
0d259f04 | 908 | for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) { |
9acd494b KC |
909 | if (fs_file->v_type == AA_FS_TYPE_DIR) |
910 | aafs_remove_dir(fs_file); | |
911 | else | |
912 | aafs_remove_file(fs_file); | |
913 | } | |
914 | ||
915 | aafs_remove_file(fs_dir); | |
63e2b423 JJ |
916 | } |
917 | ||
918 | /** | |
919 | * aa_destroy_aafs - cleanup and free aafs | |
920 | * | |
921 | * releases dentries allocated by aa_create_aafs | |
922 | */ | |
923 | void __init aa_destroy_aafs(void) | |
924 | { | |
9acd494b | 925 | aafs_remove_dir(&aa_fs_entry); |
63e2b423 JJ |
926 | } |
927 | ||
928 | /** | |
929 | * aa_create_aafs - create the apparmor security filesystem | |
930 | * | |
931 | * dentries created here are released by aa_destroy_aafs | |
932 | * | |
933 | * Returns: error on failure | |
934 | */ | |
3417d8d5 | 935 | static int __init aa_create_aafs(void) |
63e2b423 JJ |
936 | { |
937 | int error; | |
938 | ||
939 | if (!apparmor_initialized) | |
940 | return 0; | |
941 | ||
9acd494b | 942 | if (aa_fs_entry.dentry) { |
63e2b423 JJ |
943 | AA_ERROR("%s: AppArmor securityfs already exists\n", __func__); |
944 | return -EEXIST; | |
945 | } | |
946 | ||
9acd494b KC |
947 | /* Populate fs tree. */ |
948 | error = aafs_create_dir(&aa_fs_entry, NULL); | |
63e2b423 JJ |
949 | if (error) |
950 | goto error; | |
951 | ||
0d259f04 JJ |
952 | error = __aa_fs_namespace_mkdir(root_ns, aa_fs_entry.dentry, |
953 | "policy"); | |
954 | if (error) | |
955 | goto error; | |
956 | ||
63e2b423 JJ |
957 | /* TODO: add support for apparmorfs_null and apparmorfs_mnt */ |
958 | ||
959 | /* Report that AppArmor fs is enabled */ | |
960 | aa_info_message("AppArmor Filesystem Enabled"); | |
961 | return 0; | |
962 | ||
963 | error: | |
964 | aa_destroy_aafs(); | |
965 | AA_ERROR("Error creating AppArmor securityfs\n"); | |
966 | return error; | |
967 | } | |
968 | ||
969 | fs_initcall(aa_create_aafs); |