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c88d4c7b JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor policy manipulation 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 | * | |
15 | * AppArmor policy is based around profiles, which contain the rules a | |
16 | * task is confined by. Every task in the system has a profile attached | |
17 | * to it determined either by matching "unconfined" tasks against the | |
18 | * visible set of profiles or by following a profiles attachment rules. | |
19 | * | |
20 | * Each profile exists in a profile namespace which is a container of | |
21 | * visible profiles. Each namespace contains a special "unconfined" profile, | |
22 | * which doesn't enforce any confinement on a task beyond DAC. | |
23 | * | |
24 | * Namespace and profile names can be written together in either | |
25 | * of two syntaxes. | |
26 | * :namespace:profile - used by kernel interfaces for easy detection | |
27 | * namespace://profile - used by policy | |
28 | * | |
29 | * Profile names can not start with : or @ or ^ and may not contain \0 | |
30 | * | |
31 | * Reserved profile names | |
32 | * unconfined - special automatically generated unconfined profile | |
33 | * inherit - special name to indicate profile inheritance | |
34 | * null-XXXX-YYYY - special automatically generated learning profiles | |
35 | * | |
36 | * Namespace names may not start with / or @ and may not contain \0 or : | |
37 | * Reserved namespace names | |
38 | * user-XXXX - user defined profiles | |
39 | * | |
40 | * a // in a profile or namespace name indicates a hierarchical name with the | |
41 | * name before the // being the parent and the name after the child. | |
42 | * | |
43 | * Profile and namespace hierarchies serve two different but similar purposes. | |
44 | * The namespace contains the set of visible profiles that are considered | |
45 | * for attachment. The hierarchy of namespaces allows for virtualizing | |
46 | * the namespace so that for example a chroot can have its own set of profiles | |
47 | * which may define some local user namespaces. | |
48 | * The profile hierarchy severs two distinct purposes, | |
49 | * - it allows for sub profiles or hats, which allows an application to run | |
50 | * subprograms under its own profile with different restriction than it | |
51 | * self, and not have it use the system profile. | |
52 | * eg. if a mail program starts an editor, the policy might make the | |
53 | * restrictions tighter on the editor tighter than the mail program, | |
54 | * and definitely different than general editor restrictions | |
55 | * - it allows for binary hierarchy of profiles, so that execution history | |
56 | * is preserved. This feature isn't exploited by AppArmor reference policy | |
57 | * but is allowed. NOTE: this is currently suboptimal because profile | |
58 | * aliasing is not currently implemented so that a profile for each | |
59 | * level must be defined. | |
60 | * eg. /bin/bash///bin/ls as a name would indicate /bin/ls was started | |
61 | * from /bin/bash | |
62 | * | |
63 | * A profile or namespace name that can contain one or more // separators | |
64 | * is referred to as an hname (hierarchical). | |
65 | * eg. /bin/bash//bin/ls | |
66 | * | |
67 | * An fqname is a name that may contain both namespace and profile hnames. | |
68 | * eg. :ns:/bin/bash//bin/ls | |
69 | * | |
70 | * NOTES: | |
71 | * - locking of profile lists is currently fairly coarse. All profile | |
72 | * lists within a namespace use the namespace lock. | |
73 | * FIXME: move profile lists to using rcu_lists | |
74 | */ | |
75 | ||
76 | #include <linux/slab.h> | |
77 | #include <linux/spinlock.h> | |
78 | #include <linux/string.h> | |
79 | ||
80 | #include "include/apparmor.h" | |
81 | #include "include/capability.h" | |
82 | #include "include/context.h" | |
83 | #include "include/file.h" | |
84 | #include "include/ipc.h" | |
85 | #include "include/match.h" | |
86 | #include "include/path.h" | |
87 | #include "include/policy.h" | |
88 | #include "include/policy_unpack.h" | |
89 | #include "include/resource.h" | |
c88d4c7b JJ |
90 | |
91 | ||
92 | /* root profile namespace */ | |
93 | struct aa_namespace *root_ns; | |
94 | ||
2d4cee7e | 95 | const char *const profile_mode_names[] = { |
c88d4c7b JJ |
96 | "enforce", |
97 | "complain", | |
98 | "kill", | |
99 | }; | |
100 | ||
101 | /** | |
102 | * hname_tail - find the last component of an hname | |
103 | * @name: hname to find the base profile name component of (NOT NULL) | |
104 | * | |
105 | * Returns: the tail (base profile name) name component of an hname | |
106 | */ | |
107 | static const char *hname_tail(const char *hname) | |
108 | { | |
109 | char *split; | |
110 | hname = strim((char *)hname); | |
111 | for (split = strstr(hname, "//"); split; split = strstr(hname, "//")) | |
112 | hname = split + 2; | |
113 | ||
114 | return hname; | |
115 | } | |
116 | ||
117 | /** | |
118 | * policy_init - initialize a policy structure | |
119 | * @policy: policy to initialize (NOT NULL) | |
120 | * @prefix: prefix name if any is required. (MAYBE NULL) | |
121 | * @name: name of the policy, init will make a copy of it (NOT NULL) | |
122 | * | |
123 | * Note: this fn creates a copy of strings passed in | |
124 | * | |
125 | * Returns: true if policy init successful | |
126 | */ | |
127 | static bool policy_init(struct aa_policy *policy, const char *prefix, | |
128 | const char *name) | |
129 | { | |
130 | /* freed by policy_free */ | |
131 | if (prefix) { | |
132 | policy->hname = kmalloc(strlen(prefix) + strlen(name) + 3, | |
133 | GFP_KERNEL); | |
134 | if (policy->hname) | |
135 | sprintf(policy->hname, "%s//%s", prefix, name); | |
136 | } else | |
137 | policy->hname = kstrdup(name, GFP_KERNEL); | |
138 | if (!policy->hname) | |
139 | return 0; | |
140 | /* base.name is a substring of fqname */ | |
141 | policy->name = (char *)hname_tail(policy->hname); | |
142 | INIT_LIST_HEAD(&policy->list); | |
143 | INIT_LIST_HEAD(&policy->profiles); | |
144 | kref_init(&policy->count); | |
145 | ||
146 | return 1; | |
147 | } | |
148 | ||
149 | /** | |
150 | * policy_destroy - free the elements referenced by @policy | |
151 | * @policy: policy that is to have its elements freed (NOT NULL) | |
152 | */ | |
153 | static void policy_destroy(struct aa_policy *policy) | |
154 | { | |
155 | /* still contains profiles -- invalid */ | |
01e2b670 | 156 | if (on_list_rcu(&policy->profiles)) { |
c88d4c7b JJ |
157 | AA_ERROR("%s: internal error, " |
158 | "policy '%s' still contains profiles\n", | |
159 | __func__, policy->name); | |
160 | BUG(); | |
161 | } | |
01e2b670 | 162 | if (on_list_rcu(&policy->list)) { |
c88d4c7b JJ |
163 | AA_ERROR("%s: internal error, policy '%s' still on list\n", |
164 | __func__, policy->name); | |
165 | BUG(); | |
166 | } | |
167 | ||
168 | /* don't free name as its a subset of hname */ | |
169 | kzfree(policy->hname); | |
170 | } | |
171 | ||
172 | /** | |
173 | * __policy_find - find a policy by @name on a policy list | |
174 | * @head: list to search (NOT NULL) | |
175 | * @name: name to search for (NOT NULL) | |
176 | * | |
01e2b670 | 177 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
178 | * |
179 | * Returns: unrefcounted policy that match @name or NULL if not found | |
180 | */ | |
181 | static struct aa_policy *__policy_find(struct list_head *head, const char *name) | |
182 | { | |
183 | struct aa_policy *policy; | |
184 | ||
01e2b670 | 185 | list_for_each_entry_rcu(policy, head, list) { |
c88d4c7b JJ |
186 | if (!strcmp(policy->name, name)) |
187 | return policy; | |
188 | } | |
189 | return NULL; | |
190 | } | |
191 | ||
192 | /** | |
193 | * __policy_strn_find - find a policy that's name matches @len chars of @str | |
194 | * @head: list to search (NOT NULL) | |
195 | * @str: string to search for (NOT NULL) | |
196 | * @len: length of match required | |
197 | * | |
01e2b670 | 198 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
199 | * |
200 | * Returns: unrefcounted policy that match @str or NULL if not found | |
201 | * | |
202 | * if @len == strlen(@strlen) then this is equiv to __policy_find | |
203 | * other wise it allows searching for policy by a partial match of name | |
204 | */ | |
205 | static struct aa_policy *__policy_strn_find(struct list_head *head, | |
206 | const char *str, int len) | |
207 | { | |
208 | struct aa_policy *policy; | |
209 | ||
01e2b670 | 210 | list_for_each_entry_rcu(policy, head, list) { |
c88d4c7b JJ |
211 | if (aa_strneq(policy->name, str, len)) |
212 | return policy; | |
213 | } | |
214 | ||
215 | return NULL; | |
216 | } | |
217 | ||
218 | /* | |
219 | * Routines for AppArmor namespaces | |
220 | */ | |
221 | ||
222 | static const char *hidden_ns_name = "---"; | |
223 | /** | |
224 | * aa_ns_visible - test if @view is visible from @curr | |
225 | * @curr: namespace to treat as the parent (NOT NULL) | |
226 | * @view: namespace to test if visible from @curr (NOT NULL) | |
227 | * | |
228 | * Returns: true if @view is visible from @curr else false | |
229 | */ | |
230 | bool aa_ns_visible(struct aa_namespace *curr, struct aa_namespace *view) | |
231 | { | |
232 | if (curr == view) | |
233 | return true; | |
234 | ||
235 | for ( ; view; view = view->parent) { | |
236 | if (view->parent == curr) | |
237 | return true; | |
238 | } | |
239 | return false; | |
240 | } | |
241 | ||
242 | /** | |
243 | * aa_na_name - Find the ns name to display for @view from @curr | |
244 | * @curr - current namespace (NOT NULL) | |
245 | * @view - namespace attempting to view (NOT NULL) | |
246 | * | |
247 | * Returns: name of @view visible from @curr | |
248 | */ | |
249 | const char *aa_ns_name(struct aa_namespace *curr, struct aa_namespace *view) | |
250 | { | |
251 | /* if view == curr then the namespace name isn't displayed */ | |
252 | if (curr == view) | |
253 | return ""; | |
254 | ||
255 | if (aa_ns_visible(curr, view)) { | |
256 | /* at this point if a ns is visible it is in a view ns | |
257 | * thus the curr ns.hname is a prefix of its name. | |
258 | * Only output the virtualized portion of the name | |
259 | * Add + 2 to skip over // separating curr hname prefix | |
260 | * from the visible tail of the views hname | |
261 | */ | |
262 | return view->base.hname + strlen(curr->base.hname) + 2; | |
263 | } else | |
264 | return hidden_ns_name; | |
265 | } | |
266 | ||
267 | /** | |
268 | * alloc_namespace - allocate, initialize and return a new namespace | |
269 | * @prefix: parent namespace name (MAYBE NULL) | |
270 | * @name: a preallocated name (NOT NULL) | |
271 | * | |
272 | * Returns: refcounted namespace or NULL on failure. | |
273 | */ | |
274 | static struct aa_namespace *alloc_namespace(const char *prefix, | |
275 | const char *name) | |
276 | { | |
277 | struct aa_namespace *ns; | |
278 | ||
279 | ns = kzalloc(sizeof(*ns), GFP_KERNEL); | |
280 | AA_DEBUG("%s(%p)\n", __func__, ns); | |
281 | if (!ns) | |
282 | return NULL; | |
283 | if (!policy_init(&ns->base, prefix, name)) | |
284 | goto fail_ns; | |
285 | ||
286 | INIT_LIST_HEAD(&ns->sub_ns); | |
01e2b670 | 287 | mutex_init(&ns->lock); |
c88d4c7b JJ |
288 | |
289 | /* released by free_namespace */ | |
290 | ns->unconfined = aa_alloc_profile("unconfined"); | |
291 | if (!ns->unconfined) | |
292 | goto fail_unconfined; | |
293 | ||
c88d4c7b JJ |
294 | ns->unconfined->flags = PFLAG_UNCONFINED | PFLAG_IX_ON_NAME_ERROR | |
295 | PFLAG_IMMUTABLE; | |
296 | ||
297 | /* | |
298 | * released by free_namespace, however __remove_namespace breaks | |
299 | * the cyclic references (ns->unconfined, and unconfined->ns) and | |
300 | * replaces with refs to parent namespace unconfined | |
301 | */ | |
302 | ns->unconfined->ns = aa_get_namespace(ns); | |
303 | ||
a4987857 JJ |
304 | atomic_set(&ns->uniq_null, 0); |
305 | ||
c88d4c7b JJ |
306 | return ns; |
307 | ||
308 | fail_unconfined: | |
246c3fb1 | 309 | kzfree(ns->base.hname); |
c88d4c7b JJ |
310 | fail_ns: |
311 | kzfree(ns); | |
312 | return NULL; | |
313 | } | |
314 | ||
315 | /** | |
316 | * free_namespace - free a profile namespace | |
317 | * @ns: the namespace to free (MAYBE NULL) | |
318 | * | |
319 | * Requires: All references to the namespace must have been put, if the | |
320 | * namespace was referenced by a profile confining a task, | |
321 | */ | |
322 | static void free_namespace(struct aa_namespace *ns) | |
323 | { | |
324 | if (!ns) | |
325 | return; | |
326 | ||
327 | policy_destroy(&ns->base); | |
328 | aa_put_namespace(ns->parent); | |
329 | ||
330 | if (ns->unconfined && ns->unconfined->ns == ns) | |
331 | ns->unconfined->ns = NULL; | |
332 | ||
333 | aa_put_profile(ns->unconfined); | |
334 | kzfree(ns); | |
335 | } | |
336 | ||
337 | /** | |
338 | * aa_free_namespace_kref - free aa_namespace by kref (see aa_put_namespace) | |
339 | * @kr: kref callback for freeing of a namespace (NOT NULL) | |
340 | */ | |
341 | void aa_free_namespace_kref(struct kref *kref) | |
342 | { | |
343 | free_namespace(container_of(kref, struct aa_namespace, base.count)); | |
344 | } | |
345 | ||
346 | /** | |
347 | * __aa_find_namespace - find a namespace on a list by @name | |
348 | * @head: list to search for namespace on (NOT NULL) | |
349 | * @name: name of namespace to look for (NOT NULL) | |
350 | * | |
351 | * Returns: unrefcounted namespace | |
352 | * | |
01e2b670 | 353 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
354 | */ |
355 | static struct aa_namespace *__aa_find_namespace(struct list_head *head, | |
356 | const char *name) | |
357 | { | |
358 | return (struct aa_namespace *)__policy_find(head, name); | |
359 | } | |
360 | ||
361 | /** | |
362 | * aa_find_namespace - look up a profile namespace on the namespace list | |
363 | * @root: namespace to search in (NOT NULL) | |
364 | * @name: name of namespace to find (NOT NULL) | |
365 | * | |
366 | * Returns: a refcounted namespace on the list, or NULL if no namespace | |
367 | * called @name exists. | |
368 | * | |
369 | * refcount released by caller | |
370 | */ | |
371 | struct aa_namespace *aa_find_namespace(struct aa_namespace *root, | |
372 | const char *name) | |
373 | { | |
374 | struct aa_namespace *ns = NULL; | |
375 | ||
01e2b670 | 376 | rcu_read_lock(); |
c88d4c7b | 377 | ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name)); |
01e2b670 | 378 | rcu_read_unlock(); |
c88d4c7b JJ |
379 | |
380 | return ns; | |
381 | } | |
382 | ||
383 | /** | |
384 | * aa_prepare_namespace - find an existing or create a new namespace of @name | |
385 | * @name: the namespace to find or add (MAYBE NULL) | |
386 | * | |
387 | * Returns: refcounted namespace or NULL if failed to create one | |
388 | */ | |
389 | static struct aa_namespace *aa_prepare_namespace(const char *name) | |
390 | { | |
391 | struct aa_namespace *ns, *root; | |
392 | ||
393 | root = aa_current_profile()->ns; | |
394 | ||
01e2b670 | 395 | mutex_lock(&root->lock); |
c88d4c7b JJ |
396 | |
397 | /* if name isn't specified the profile is loaded to the current ns */ | |
398 | if (!name) { | |
399 | /* released by caller */ | |
400 | ns = aa_get_namespace(root); | |
401 | goto out; | |
402 | } | |
403 | ||
404 | /* try and find the specified ns and if it doesn't exist create it */ | |
405 | /* released by caller */ | |
406 | ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name)); | |
407 | if (!ns) { | |
01e2b670 JJ |
408 | ns = alloc_namespace(root->base.hname, name); |
409 | if (!ns) | |
410 | goto out; | |
411 | /* add parent ref */ | |
412 | ns->parent = aa_get_namespace(root); | |
413 | list_add_rcu(&ns->base.list, &root->sub_ns); | |
414 | /* add list ref */ | |
415 | aa_get_namespace(ns); | |
c88d4c7b JJ |
416 | } |
417 | out: | |
01e2b670 | 418 | mutex_unlock(&root->lock); |
c88d4c7b JJ |
419 | |
420 | /* return ref */ | |
421 | return ns; | |
422 | } | |
423 | ||
424 | /** | |
425 | * __list_add_profile - add a profile to a list | |
426 | * @list: list to add it to (NOT NULL) | |
427 | * @profile: the profile to add (NOT NULL) | |
428 | * | |
429 | * refcount @profile, should be put by __list_remove_profile | |
430 | * | |
431 | * Requires: namespace lock be held, or list not be shared | |
432 | */ | |
433 | static void __list_add_profile(struct list_head *list, | |
434 | struct aa_profile *profile) | |
435 | { | |
01e2b670 | 436 | list_add_rcu(&profile->base.list, list); |
c88d4c7b JJ |
437 | /* get list reference */ |
438 | aa_get_profile(profile); | |
439 | } | |
440 | ||
441 | /** | |
442 | * __list_remove_profile - remove a profile from the list it is on | |
443 | * @profile: the profile to remove (NOT NULL) | |
444 | * | |
445 | * remove a profile from the list, warning generally removal should | |
446 | * be done with __replace_profile as most profile removals are | |
447 | * replacements to the unconfined profile. | |
448 | * | |
449 | * put @profile list refcount | |
450 | * | |
451 | * Requires: namespace lock be held, or list not have been live | |
452 | */ | |
453 | static void __list_remove_profile(struct aa_profile *profile) | |
454 | { | |
01e2b670 JJ |
455 | list_del_rcu(&profile->base.list); |
456 | aa_put_profile(profile); | |
c88d4c7b JJ |
457 | } |
458 | ||
c88d4c7b JJ |
459 | static void __profile_list_release(struct list_head *head); |
460 | ||
461 | /** | |
462 | * __remove_profile - remove old profile, and children | |
463 | * @profile: profile to be replaced (NOT NULL) | |
464 | * | |
465 | * Requires: namespace list lock be held, or list not be shared | |
466 | */ | |
467 | static void __remove_profile(struct aa_profile *profile) | |
468 | { | |
469 | /* release any children lists first */ | |
470 | __profile_list_release(&profile->base.profiles); | |
471 | /* released by free_profile */ | |
77b071b3 | 472 | __aa_update_replacedby(profile, profile->ns->unconfined); |
c88d4c7b JJ |
473 | __list_remove_profile(profile); |
474 | } | |
475 | ||
476 | /** | |
477 | * __profile_list_release - remove all profiles on the list and put refs | |
478 | * @head: list of profiles (NOT NULL) | |
479 | * | |
480 | * Requires: namespace lock be held | |
481 | */ | |
482 | static void __profile_list_release(struct list_head *head) | |
483 | { | |
484 | struct aa_profile *profile, *tmp; | |
485 | list_for_each_entry_safe(profile, tmp, head, base.list) | |
486 | __remove_profile(profile); | |
487 | } | |
488 | ||
489 | static void __ns_list_release(struct list_head *head); | |
490 | ||
491 | /** | |
492 | * destroy_namespace - remove everything contained by @ns | |
493 | * @ns: namespace to have it contents removed (NOT NULL) | |
494 | */ | |
495 | static void destroy_namespace(struct aa_namespace *ns) | |
496 | { | |
01e2b670 JJ |
497 | struct aa_profile *unconfined; |
498 | ||
c88d4c7b JJ |
499 | if (!ns) |
500 | return; | |
501 | ||
01e2b670 | 502 | mutex_lock(&ns->lock); |
c88d4c7b JJ |
503 | /* release all profiles in this namespace */ |
504 | __profile_list_release(&ns->base.profiles); | |
505 | ||
506 | /* release all sub namespaces */ | |
507 | __ns_list_release(&ns->sub_ns); | |
508 | ||
01e2b670 JJ |
509 | unconfined = ns->unconfined; |
510 | /* | |
511 | * break the ns, unconfined profile cyclic reference and forward | |
512 | * all new unconfined profiles requests to the parent namespace | |
513 | * This will result in all confined tasks that have a profile | |
514 | * being removed, inheriting the parent->unconfined profile. | |
515 | */ | |
516 | if (ns->parent) | |
517 | ns->unconfined = aa_get_profile(ns->parent->unconfined); | |
518 | ||
519 | /* release original ns->unconfined ref */ | |
520 | aa_put_profile(unconfined); | |
521 | ||
522 | mutex_unlock(&ns->lock); | |
523 | } | |
524 | ||
525 | static void aa_put_ns_rcu(struct rcu_head *head) | |
526 | { | |
527 | struct aa_namespace *ns = container_of(head, struct aa_namespace, | |
528 | base.rcu); | |
529 | /* release ns->base.list ref */ | |
530 | aa_put_namespace(ns); | |
c88d4c7b JJ |
531 | } |
532 | ||
533 | /** | |
534 | * __remove_namespace - remove a namespace and all its children | |
535 | * @ns: namespace to be removed (NOT NULL) | |
536 | * | |
537 | * Requires: ns->parent->lock be held and ns removed from parent. | |
538 | */ | |
539 | static void __remove_namespace(struct aa_namespace *ns) | |
540 | { | |
c88d4c7b | 541 | /* remove ns from namespace list */ |
01e2b670 | 542 | list_del_rcu(&ns->base.list); |
c88d4c7b JJ |
543 | |
544 | destroy_namespace(ns); | |
545 | ||
01e2b670 | 546 | call_rcu(&ns->base.rcu, aa_put_ns_rcu); |
c88d4c7b JJ |
547 | } |
548 | ||
549 | /** | |
550 | * __ns_list_release - remove all profile namespaces on the list put refs | |
551 | * @head: list of profile namespaces (NOT NULL) | |
552 | * | |
553 | * Requires: namespace lock be held | |
554 | */ | |
555 | static void __ns_list_release(struct list_head *head) | |
556 | { | |
557 | struct aa_namespace *ns, *tmp; | |
558 | list_for_each_entry_safe(ns, tmp, head, base.list) | |
559 | __remove_namespace(ns); | |
560 | ||
561 | } | |
562 | ||
563 | /** | |
564 | * aa_alloc_root_ns - allocate the root profile namespace | |
565 | * | |
566 | * Returns: %0 on success else error | |
567 | * | |
568 | */ | |
569 | int __init aa_alloc_root_ns(void) | |
570 | { | |
571 | /* released by aa_free_root_ns - used as list ref*/ | |
572 | root_ns = alloc_namespace(NULL, "root"); | |
573 | if (!root_ns) | |
574 | return -ENOMEM; | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | /** | |
580 | * aa_free_root_ns - free the root profile namespace | |
581 | */ | |
582 | void __init aa_free_root_ns(void) | |
583 | { | |
584 | struct aa_namespace *ns = root_ns; | |
585 | root_ns = NULL; | |
586 | ||
587 | destroy_namespace(ns); | |
588 | aa_put_namespace(ns); | |
589 | } | |
590 | ||
77b071b3 JJ |
591 | |
592 | static void free_replacedby(struct aa_replacedby *r) | |
593 | { | |
594 | if (r) { | |
595 | aa_put_profile(rcu_dereference(r->profile)); | |
596 | kzfree(r); | |
597 | } | |
598 | } | |
599 | ||
600 | ||
601 | void aa_free_replacedby_kref(struct kref *kref) | |
602 | { | |
603 | struct aa_replacedby *r = container_of(kref, struct aa_replacedby, | |
604 | count); | |
605 | free_replacedby(r); | |
606 | } | |
607 | ||
c88d4c7b JJ |
608 | /** |
609 | * free_profile - free a profile | |
610 | * @profile: the profile to free (MAYBE NULL) | |
611 | * | |
612 | * Free a profile, its hats and null_profile. All references to the profile, | |
613 | * its hats and null_profile must have been put. | |
614 | * | |
615 | * If the profile was referenced from a task context, free_profile() will | |
616 | * be called from an rcu callback routine, so we must not sleep here. | |
617 | */ | |
618 | static void free_profile(struct aa_profile *profile) | |
619 | { | |
620 | AA_DEBUG("%s(%p)\n", __func__, profile); | |
621 | ||
622 | if (!profile) | |
623 | return; | |
624 | ||
c88d4c7b JJ |
625 | /* free children profiles */ |
626 | policy_destroy(&profile->base); | |
01e2b670 | 627 | aa_put_profile(rcu_access_pointer(profile->parent)); |
c88d4c7b JJ |
628 | |
629 | aa_put_namespace(profile->ns); | |
630 | kzfree(profile->rename); | |
631 | ||
632 | aa_free_file_rules(&profile->file); | |
633 | aa_free_cap_rules(&profile->caps); | |
634 | aa_free_rlimit_rules(&profile->rlimits); | |
635 | ||
c88d4c7b | 636 | aa_put_dfa(profile->xmatch); |
ad5ff3db | 637 | aa_put_dfa(profile->policy.dfa); |
77b071b3 | 638 | aa_put_replacedby(profile->replacedby); |
c88d4c7b JJ |
639 | |
640 | kzfree(profile); | |
641 | } | |
642 | ||
01e2b670 JJ |
643 | /** |
644 | * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref) | |
645 | * @head: rcu_head callback for freeing of a profile (NOT NULL) | |
646 | */ | |
647 | static void aa_free_profile_rcu(struct rcu_head *head) | |
648 | { | |
649 | struct aa_profile *p = container_of(head, struct aa_profile, base.rcu); | |
650 | free_profile(p); | |
651 | } | |
652 | ||
c88d4c7b JJ |
653 | /** |
654 | * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile) | |
655 | * @kr: kref callback for freeing of a profile (NOT NULL) | |
656 | */ | |
657 | void aa_free_profile_kref(struct kref *kref) | |
658 | { | |
659 | struct aa_profile *p = container_of(kref, struct aa_profile, | |
660 | base.count); | |
01e2b670 | 661 | call_rcu(&p->base.rcu, aa_free_profile_rcu); |
c88d4c7b JJ |
662 | } |
663 | ||
4da05cc0 JJ |
664 | /** |
665 | * aa_alloc_profile - allocate, initialize and return a new profile | |
666 | * @hname: name of the profile (NOT NULL) | |
667 | * | |
668 | * Returns: refcount profile or NULL on failure | |
669 | */ | |
670 | struct aa_profile *aa_alloc_profile(const char *hname) | |
671 | { | |
672 | struct aa_profile *profile; | |
673 | ||
674 | /* freed by free_profile - usually through aa_put_profile */ | |
675 | profile = kzalloc(sizeof(*profile), GFP_KERNEL); | |
676 | if (!profile) | |
677 | return NULL; | |
678 | ||
77b071b3 JJ |
679 | profile->replacedby = kzalloc(sizeof(struct aa_replacedby), GFP_KERNEL); |
680 | if (!profile->replacedby) | |
681 | goto fail; | |
682 | kref_init(&profile->replacedby->count); | |
683 | ||
684 | if (!policy_init(&profile->base, NULL, hname)) | |
685 | goto fail; | |
4da05cc0 JJ |
686 | |
687 | /* refcount released by caller */ | |
688 | return profile; | |
77b071b3 JJ |
689 | |
690 | fail: | |
691 | kzfree(profile->replacedby); | |
692 | kzfree(profile); | |
693 | ||
694 | return NULL; | |
4da05cc0 JJ |
695 | } |
696 | ||
697 | /** | |
698 | * aa_new_null_profile - create a new null-X learning profile | |
699 | * @parent: profile that caused this profile to be created (NOT NULL) | |
700 | * @hat: true if the null- learning profile is a hat | |
701 | * | |
702 | * Create a null- complain mode profile used in learning mode. The name of | |
703 | * the profile is unique and follows the format of parent//null-<uniq>. | |
704 | * | |
705 | * null profiles are added to the profile list but the list does not | |
706 | * hold a count on them so that they are automatically released when | |
707 | * not in use. | |
708 | * | |
709 | * Returns: new refcounted profile else NULL on failure | |
710 | */ | |
711 | struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat) | |
712 | { | |
713 | struct aa_profile *profile = NULL; | |
714 | char *name; | |
715 | int uniq = atomic_inc_return(&parent->ns->uniq_null); | |
716 | ||
717 | /* freed below */ | |
718 | name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, GFP_KERNEL); | |
719 | if (!name) | |
720 | goto fail; | |
721 | sprintf(name, "%s//null-%x", parent->base.hname, uniq); | |
722 | ||
723 | profile = aa_alloc_profile(name); | |
724 | kfree(name); | |
725 | if (!profile) | |
726 | goto fail; | |
727 | ||
728 | profile->mode = APPARMOR_COMPLAIN; | |
729 | profile->flags = PFLAG_NULL; | |
730 | if (hat) | |
731 | profile->flags |= PFLAG_HAT; | |
732 | ||
733 | /* released on free_profile */ | |
01e2b670 | 734 | rcu_assign_pointer(profile->parent, aa_get_profile(parent)); |
4da05cc0 JJ |
735 | profile->ns = aa_get_namespace(parent->ns); |
736 | ||
01e2b670 | 737 | mutex_lock(&profile->ns->lock); |
4da05cc0 | 738 | __list_add_profile(&parent->base.profiles, profile); |
01e2b670 | 739 | mutex_unlock(&profile->ns->lock); |
4da05cc0 JJ |
740 | |
741 | /* refcount released by caller */ | |
742 | return profile; | |
743 | ||
744 | fail: | |
745 | return NULL; | |
746 | } | |
747 | ||
c88d4c7b JJ |
748 | /* TODO: profile accounting - setup in remove */ |
749 | ||
750 | /** | |
751 | * __find_child - find a profile on @head list with a name matching @name | |
752 | * @head: list to search (NOT NULL) | |
753 | * @name: name of profile (NOT NULL) | |
754 | * | |
01e2b670 | 755 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
756 | * |
757 | * Returns: unrefcounted profile ptr, or NULL if not found | |
758 | */ | |
759 | static struct aa_profile *__find_child(struct list_head *head, const char *name) | |
760 | { | |
761 | return (struct aa_profile *)__policy_find(head, name); | |
762 | } | |
763 | ||
764 | /** | |
765 | * __strn_find_child - find a profile on @head list using substring of @name | |
766 | * @head: list to search (NOT NULL) | |
767 | * @name: name of profile (NOT NULL) | |
768 | * @len: length of @name substring to match | |
769 | * | |
01e2b670 | 770 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
771 | * |
772 | * Returns: unrefcounted profile ptr, or NULL if not found | |
773 | */ | |
774 | static struct aa_profile *__strn_find_child(struct list_head *head, | |
775 | const char *name, int len) | |
776 | { | |
777 | return (struct aa_profile *)__policy_strn_find(head, name, len); | |
778 | } | |
779 | ||
780 | /** | |
781 | * aa_find_child - find a profile by @name in @parent | |
782 | * @parent: profile to search (NOT NULL) | |
783 | * @name: profile name to search for (NOT NULL) | |
784 | * | |
785 | * Returns: a refcounted profile or NULL if not found | |
786 | */ | |
787 | struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name) | |
788 | { | |
789 | struct aa_profile *profile; | |
790 | ||
01e2b670 | 791 | rcu_read_lock(); |
c88d4c7b | 792 | profile = aa_get_profile(__find_child(&parent->base.profiles, name)); |
01e2b670 | 793 | rcu_read_unlock(); |
c88d4c7b JJ |
794 | |
795 | /* refcount released by caller */ | |
796 | return profile; | |
797 | } | |
798 | ||
799 | /** | |
800 | * __lookup_parent - lookup the parent of a profile of name @hname | |
801 | * @ns: namespace to lookup profile in (NOT NULL) | |
802 | * @hname: hierarchical profile name to find parent of (NOT NULL) | |
803 | * | |
804 | * Lookups up the parent of a fully qualified profile name, the profile | |
805 | * that matches hname does not need to exist, in general this | |
806 | * is used to load a new profile. | |
807 | * | |
01e2b670 | 808 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
809 | * |
810 | * Returns: unrefcounted policy or NULL if not found | |
811 | */ | |
812 | static struct aa_policy *__lookup_parent(struct aa_namespace *ns, | |
813 | const char *hname) | |
814 | { | |
815 | struct aa_policy *policy; | |
816 | struct aa_profile *profile = NULL; | |
817 | char *split; | |
818 | ||
819 | policy = &ns->base; | |
820 | ||
821 | for (split = strstr(hname, "//"); split;) { | |
822 | profile = __strn_find_child(&policy->profiles, hname, | |
823 | split - hname); | |
824 | if (!profile) | |
825 | return NULL; | |
826 | policy = &profile->base; | |
827 | hname = split + 2; | |
828 | split = strstr(hname, "//"); | |
829 | } | |
830 | if (!profile) | |
831 | return &ns->base; | |
832 | return &profile->base; | |
833 | } | |
834 | ||
835 | /** | |
836 | * __lookup_profile - lookup the profile matching @hname | |
837 | * @base: base list to start looking up profile name from (NOT NULL) | |
838 | * @hname: hierarchical profile name (NOT NULL) | |
839 | * | |
01e2b670 | 840 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
841 | * |
842 | * Returns: unrefcounted profile pointer or NULL if not found | |
843 | * | |
844 | * Do a relative name lookup, recursing through profile tree. | |
845 | */ | |
846 | static struct aa_profile *__lookup_profile(struct aa_policy *base, | |
847 | const char *hname) | |
848 | { | |
849 | struct aa_profile *profile = NULL; | |
850 | char *split; | |
851 | ||
852 | for (split = strstr(hname, "//"); split;) { | |
853 | profile = __strn_find_child(&base->profiles, hname, | |
854 | split - hname); | |
855 | if (!profile) | |
856 | return NULL; | |
857 | ||
858 | base = &profile->base; | |
859 | hname = split + 2; | |
860 | split = strstr(hname, "//"); | |
861 | } | |
862 | ||
863 | profile = __find_child(&base->profiles, hname); | |
864 | ||
865 | return profile; | |
866 | } | |
867 | ||
868 | /** | |
869 | * aa_lookup_profile - find a profile by its full or partial name | |
870 | * @ns: the namespace to start from (NOT NULL) | |
871 | * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL) | |
872 | * | |
873 | * Returns: refcounted profile or NULL if not found | |
874 | */ | |
875 | struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *hname) | |
876 | { | |
877 | struct aa_profile *profile; | |
878 | ||
01e2b670 JJ |
879 | rcu_read_lock(); |
880 | do { | |
881 | profile = __lookup_profile(&ns->base, hname); | |
882 | } while (profile && !aa_get_profile_not0(profile)); | |
883 | rcu_read_unlock(); | |
c88d4c7b | 884 | |
bf83208e JJ |
885 | /* the unconfined profile is not in the regular profile list */ |
886 | if (!profile && strcmp(hname, "unconfined") == 0) | |
887 | profile = aa_get_profile(ns->unconfined); | |
888 | ||
c88d4c7b JJ |
889 | /* refcount released by caller */ |
890 | return profile; | |
891 | } | |
892 | ||
893 | /** | |
894 | * replacement_allowed - test to see if replacement is allowed | |
895 | * @profile: profile to test if it can be replaced (MAYBE NULL) | |
896 | * @noreplace: true if replacement shouldn't be allowed but addition is okay | |
897 | * @info: Returns - info about why replacement failed (NOT NULL) | |
898 | * | |
899 | * Returns: %0 if replacement allowed else error code | |
900 | */ | |
901 | static int replacement_allowed(struct aa_profile *profile, int noreplace, | |
902 | const char **info) | |
903 | { | |
904 | if (profile) { | |
905 | if (profile->flags & PFLAG_IMMUTABLE) { | |
906 | *info = "cannot replace immutible profile"; | |
907 | return -EPERM; | |
908 | } else if (noreplace) { | |
909 | *info = "profile already exists"; | |
910 | return -EEXIST; | |
911 | } | |
912 | } | |
913 | return 0; | |
914 | } | |
915 | ||
c88d4c7b JJ |
916 | /** |
917 | * aa_audit_policy - Do auditing of policy changes | |
918 | * @op: policy operation being performed | |
919 | * @gfp: memory allocation flags | |
920 | * @name: name of profile being manipulated (NOT NULL) | |
921 | * @info: any extra information to be audited (MAYBE NULL) | |
922 | * @error: error code | |
923 | * | |
924 | * Returns: the error to be returned after audit is done | |
925 | */ | |
926 | static int audit_policy(int op, gfp_t gfp, const char *name, const char *info, | |
927 | int error) | |
928 | { | |
929 | struct common_audit_data sa; | |
3b3b0e4f | 930 | struct apparmor_audit_data aad = {0,}; |
50c205f5 | 931 | sa.type = LSM_AUDIT_DATA_NONE; |
3b3b0e4f EP |
932 | sa.aad = &aad; |
933 | aad.op = op; | |
934 | aad.name = name; | |
935 | aad.info = info; | |
936 | aad.error = error; | |
c88d4c7b JJ |
937 | |
938 | return aa_audit(AUDIT_APPARMOR_STATUS, __aa_current_profile(), gfp, | |
939 | &sa, NULL); | |
940 | } | |
941 | ||
942 | /** | |
943 | * aa_may_manage_policy - can the current task manage policy | |
944 | * @op: the policy manipulation operation being done | |
945 | * | |
946 | * Returns: true if the task is allowed to manipulate policy | |
947 | */ | |
948 | bool aa_may_manage_policy(int op) | |
949 | { | |
950 | /* check if loading policy is locked out */ | |
951 | if (aa_g_lock_policy) { | |
952 | audit_policy(op, GFP_KERNEL, NULL, "policy_locked", -EACCES); | |
953 | return 0; | |
954 | } | |
955 | ||
956 | if (!capable(CAP_MAC_ADMIN)) { | |
957 | audit_policy(op, GFP_KERNEL, NULL, "not policy admin", -EACCES); | |
958 | return 0; | |
959 | } | |
960 | ||
961 | return 1; | |
962 | } | |
963 | ||
dd51c848 JJ |
964 | static struct aa_profile *__list_lookup_parent(struct list_head *lh, |
965 | struct aa_profile *profile) | |
966 | { | |
967 | const char *base = hname_tail(profile->base.hname); | |
968 | long len = base - profile->base.hname; | |
969 | struct aa_load_ent *ent; | |
970 | ||
971 | /* parent won't have trailing // so remove from len */ | |
972 | if (len <= 2) | |
973 | return NULL; | |
974 | len -= 2; | |
975 | ||
976 | list_for_each_entry(ent, lh, list) { | |
977 | if (ent->new == profile) | |
978 | continue; | |
979 | if (strncmp(ent->new->base.hname, profile->base.hname, len) == | |
980 | 0 && ent->new->base.hname[len] == 0) | |
981 | return ent->new; | |
982 | } | |
983 | ||
984 | return NULL; | |
985 | } | |
986 | ||
987 | /** | |
988 | * __replace_profile - replace @old with @new on a list | |
989 | * @old: profile to be replaced (NOT NULL) | |
990 | * @new: profile to replace @old with (NOT NULL) | |
77b071b3 | 991 | * @share_replacedby: transfer @old->replacedby to @new |
dd51c848 JJ |
992 | * |
993 | * Will duplicate and refcount elements that @new inherits from @old | |
994 | * and will inherit @old children. | |
995 | * | |
996 | * refcount @new for list, put @old list refcount | |
997 | * | |
998 | * Requires: namespace list lock be held, or list not be shared | |
999 | */ | |
77b071b3 JJ |
1000 | static void __replace_profile(struct aa_profile *old, struct aa_profile *new, |
1001 | bool share_replacedby) | |
dd51c848 JJ |
1002 | { |
1003 | struct aa_profile *child, *tmp; | |
1004 | ||
1005 | if (!list_empty(&old->base.profiles)) { | |
1006 | LIST_HEAD(lh); | |
01e2b670 | 1007 | list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu); |
dd51c848 JJ |
1008 | |
1009 | list_for_each_entry_safe(child, tmp, &lh, base.list) { | |
1010 | struct aa_profile *p; | |
1011 | ||
1012 | list_del_init(&child->base.list); | |
1013 | p = __find_child(&new->base.profiles, child->base.name); | |
1014 | if (p) { | |
1015 | /* @p replaces @child */ | |
77b071b3 | 1016 | __replace_profile(child, p, share_replacedby); |
dd51c848 JJ |
1017 | continue; |
1018 | } | |
1019 | ||
1020 | /* inherit @child and its children */ | |
1021 | /* TODO: update hname of inherited children */ | |
1022 | /* list refcount transferred to @new */ | |
01e2b670 JJ |
1023 | p = rcu_dereference_protected(child->parent, |
1024 | mutex_is_locked(&child->ns->lock)); | |
1025 | rcu_assign_pointer(child->parent, aa_get_profile(new)); | |
1026 | list_add_rcu(&child->base.list, &new->base.profiles); | |
1027 | aa_put_profile(p); | |
dd51c848 JJ |
1028 | } |
1029 | } | |
1030 | ||
01e2b670 JJ |
1031 | if (!rcu_access_pointer(new->parent)) { |
1032 | struct aa_profile *parent = rcu_dereference(old->parent); | |
1033 | rcu_assign_pointer(new->parent, aa_get_profile(parent)); | |
1034 | } | |
77b071b3 JJ |
1035 | __aa_update_replacedby(old, new); |
1036 | if (share_replacedby) { | |
1037 | aa_put_replacedby(new->replacedby); | |
1038 | new->replacedby = aa_get_replacedby(old->replacedby); | |
1039 | } | |
dd51c848 JJ |
1040 | |
1041 | if (list_empty(&new->base.list)) { | |
1042 | /* new is not on a list already */ | |
01e2b670 | 1043 | list_replace_rcu(&old->base.list, &new->base.list); |
dd51c848 JJ |
1044 | aa_get_profile(new); |
1045 | aa_put_profile(old); | |
1046 | } else | |
1047 | __list_remove_profile(old); | |
1048 | } | |
1049 | ||
1050 | /** | |
1051 | * __lookup_replace - lookup replacement information for a profile | |
1052 | * @ns - namespace the lookup occurs in | |
1053 | * @hname - name of profile to lookup | |
1054 | * @noreplace - true if not replacing an existing profile | |
1055 | * @p - Returns: profile to be replaced | |
1056 | * @info - Returns: info string on why lookup failed | |
1057 | * | |
1058 | * Returns: profile to replace (no ref) on success else ptr error | |
1059 | */ | |
1060 | static int __lookup_replace(struct aa_namespace *ns, const char *hname, | |
1061 | bool noreplace, struct aa_profile **p, | |
1062 | const char **info) | |
1063 | { | |
1064 | *p = aa_get_profile(__lookup_profile(&ns->base, hname)); | |
1065 | if (*p) { | |
1066 | int error = replacement_allowed(*p, noreplace, info); | |
1067 | if (error) { | |
1068 | *info = "profile can not be replaced"; | |
1069 | return error; | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | return 0; | |
1074 | } | |
1075 | ||
c88d4c7b JJ |
1076 | /** |
1077 | * aa_replace_profiles - replace profile(s) on the profile list | |
1078 | * @udata: serialized data stream (NOT NULL) | |
1079 | * @size: size of the serialized data stream | |
1080 | * @noreplace: true if only doing addition, no replacement allowed | |
1081 | * | |
1082 | * unpack and replace a profile on the profile list and uses of that profile | |
1083 | * by any aa_task_cxt. If the profile does not exist on the profile list | |
1084 | * it is added. | |
1085 | * | |
1086 | * Returns: size of data consumed else error code on failure. | |
1087 | */ | |
1088 | ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace) | |
1089 | { | |
c88d4c7b | 1090 | const char *ns_name, *name = NULL, *info = NULL; |
dd51c848 JJ |
1091 | struct aa_namespace *ns = NULL; |
1092 | struct aa_load_ent *ent, *tmp; | |
c88d4c7b JJ |
1093 | int op = OP_PROF_REPL; |
1094 | ssize_t error; | |
dd51c848 | 1095 | LIST_HEAD(lh); |
c88d4c7b JJ |
1096 | |
1097 | /* released below */ | |
dd51c848 JJ |
1098 | error = aa_unpack(udata, size, &lh, &ns_name); |
1099 | if (error) | |
1100 | goto out; | |
c88d4c7b JJ |
1101 | |
1102 | /* released below */ | |
1103 | ns = aa_prepare_namespace(ns_name); | |
1104 | if (!ns) { | |
1105 | info = "failed to prepare namespace"; | |
1106 | error = -ENOMEM; | |
1107 | name = ns_name; | |
1108 | goto fail; | |
1109 | } | |
1110 | ||
01e2b670 | 1111 | mutex_lock(&ns->lock); |
dd51c848 JJ |
1112 | /* setup parent and ns info */ |
1113 | list_for_each_entry(ent, &lh, list) { | |
1114 | struct aa_policy *policy; | |
1115 | ||
1116 | name = ent->new->base.hname; | |
1117 | error = __lookup_replace(ns, ent->new->base.hname, noreplace, | |
1118 | &ent->old, &info); | |
1119 | if (error) | |
1120 | goto fail_lock; | |
1121 | ||
1122 | if (ent->new->rename) { | |
1123 | error = __lookup_replace(ns, ent->new->rename, | |
1124 | noreplace, &ent->rename, | |
1125 | &info); | |
1126 | if (error) | |
1127 | goto fail_lock; | |
c88d4c7b | 1128 | } |
c88d4c7b | 1129 | |
dd51c848 JJ |
1130 | /* released when @new is freed */ |
1131 | ent->new->ns = aa_get_namespace(ns); | |
1132 | ||
1133 | if (ent->old || ent->rename) | |
1134 | continue; | |
1135 | ||
1136 | /* no ref on policy only use inside lock */ | |
1137 | policy = __lookup_parent(ns, ent->new->base.hname); | |
1138 | if (!policy) { | |
1139 | struct aa_profile *p; | |
1140 | p = __list_lookup_parent(&lh, ent->new); | |
1141 | if (!p) { | |
1142 | error = -ENOENT; | |
1143 | info = "parent does not exist"; | |
1144 | name = ent->new->base.hname; | |
1145 | goto fail_lock; | |
1146 | } | |
01e2b670 JJ |
1147 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); |
1148 | } else if (policy != &ns->base) { | |
dd51c848 | 1149 | /* released on profile replacement or free_profile */ |
01e2b670 JJ |
1150 | struct aa_profile *p = (struct aa_profile *) policy; |
1151 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); | |
1152 | } | |
dd51c848 | 1153 | } |
c88d4c7b | 1154 | |
dd51c848 JJ |
1155 | /* do actual replacement */ |
1156 | list_for_each_entry_safe(ent, tmp, &lh, list) { | |
1157 | list_del_init(&ent->list); | |
1158 | op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL; | |
1159 | ||
1160 | audit_policy(op, GFP_ATOMIC, ent->new->base.name, NULL, error); | |
1161 | ||
1162 | if (ent->old) { | |
77b071b3 | 1163 | __replace_profile(ent->old, ent->new, 1); |
dd51c848 | 1164 | if (ent->rename) |
77b071b3 | 1165 | __replace_profile(ent->rename, ent->new, 0); |
dd51c848 | 1166 | } else if (ent->rename) { |
77b071b3 | 1167 | __replace_profile(ent->rename, ent->new, 0); |
dd51c848 | 1168 | } else if (ent->new->parent) { |
01e2b670 JJ |
1169 | struct aa_profile *parent, *newest; |
1170 | parent = rcu_dereference_protected(ent->new->parent, | |
1171 | mutex_is_locked(&ns->lock)); | |
77b071b3 | 1172 | newest = aa_get_newest_profile(parent); |
01e2b670 | 1173 | |
dd51c848 | 1174 | /* parent replaced in this atomic set? */ |
01e2b670 JJ |
1175 | if (newest != parent) { |
1176 | aa_get_profile(newest); | |
1177 | aa_put_profile(parent); | |
1178 | rcu_assign_pointer(ent->new->parent, newest); | |
77b071b3 JJ |
1179 | } else |
1180 | aa_put_profile(newest); | |
dd51c848 JJ |
1181 | __list_add_profile(&parent->base.profiles, ent->new); |
1182 | } else | |
1183 | __list_add_profile(&ns->base.profiles, ent->new); | |
c88d4c7b | 1184 | |
dd51c848 | 1185 | aa_load_ent_free(ent); |
c88d4c7b | 1186 | } |
01e2b670 | 1187 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
1188 | |
1189 | out: | |
1190 | aa_put_namespace(ns); | |
dd51c848 | 1191 | |
c88d4c7b JJ |
1192 | if (error) |
1193 | return error; | |
1194 | return size; | |
1195 | ||
dd51c848 | 1196 | fail_lock: |
01e2b670 | 1197 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
1198 | fail: |
1199 | error = audit_policy(op, GFP_KERNEL, name, info, error); | |
dd51c848 JJ |
1200 | |
1201 | list_for_each_entry_safe(ent, tmp, &lh, list) { | |
1202 | list_del_init(&ent->list); | |
1203 | aa_load_ent_free(ent); | |
1204 | } | |
1205 | ||
c88d4c7b JJ |
1206 | goto out; |
1207 | } | |
1208 | ||
1209 | /** | |
1210 | * aa_remove_profiles - remove profile(s) from the system | |
1211 | * @fqname: name of the profile or namespace to remove (NOT NULL) | |
1212 | * @size: size of the name | |
1213 | * | |
1214 | * Remove a profile or sub namespace from the current namespace, so that | |
1215 | * they can not be found anymore and mark them as replaced by unconfined | |
1216 | * | |
1217 | * NOTE: removing confinement does not restore rlimits to preconfinemnet values | |
1218 | * | |
1219 | * Returns: size of data consume else error code if fails | |
1220 | */ | |
1221 | ssize_t aa_remove_profiles(char *fqname, size_t size) | |
1222 | { | |
1223 | struct aa_namespace *root, *ns = NULL; | |
1224 | struct aa_profile *profile = NULL; | |
1225 | const char *name = fqname, *info = NULL; | |
1226 | ssize_t error = 0; | |
1227 | ||
1228 | if (*fqname == 0) { | |
1229 | info = "no profile specified"; | |
1230 | error = -ENOENT; | |
1231 | goto fail; | |
1232 | } | |
1233 | ||
1234 | root = aa_current_profile()->ns; | |
1235 | ||
1236 | if (fqname[0] == ':') { | |
1237 | char *ns_name; | |
1238 | name = aa_split_fqname(fqname, &ns_name); | |
41d1b3e8 JJ |
1239 | /* released below */ |
1240 | ns = aa_find_namespace(root, ns_name); | |
1241 | if (!ns) { | |
1242 | info = "namespace does not exist"; | |
1243 | error = -ENOENT; | |
1244 | goto fail; | |
c88d4c7b JJ |
1245 | } |
1246 | } else | |
1247 | /* released below */ | |
1248 | ns = aa_get_namespace(root); | |
1249 | ||
c88d4c7b JJ |
1250 | if (!name) { |
1251 | /* remove namespace - can only happen if fqname[0] == ':' */ | |
01e2b670 | 1252 | mutex_lock(&ns->parent->lock); |
c88d4c7b | 1253 | __remove_namespace(ns); |
01e2b670 | 1254 | mutex_unlock(&ns->parent->lock); |
c88d4c7b JJ |
1255 | } else { |
1256 | /* remove profile */ | |
01e2b670 | 1257 | mutex_lock(&ns->lock); |
c88d4c7b JJ |
1258 | profile = aa_get_profile(__lookup_profile(&ns->base, name)); |
1259 | if (!profile) { | |
1260 | error = -ENOENT; | |
1261 | info = "profile does not exist"; | |
1262 | goto fail_ns_lock; | |
1263 | } | |
1264 | name = profile->base.hname; | |
1265 | __remove_profile(profile); | |
01e2b670 | 1266 | mutex_unlock(&ns->lock); |
c88d4c7b | 1267 | } |
c88d4c7b JJ |
1268 | |
1269 | /* don't fail removal if audit fails */ | |
1270 | (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error); | |
1271 | aa_put_namespace(ns); | |
1272 | aa_put_profile(profile); | |
1273 | return size; | |
1274 | ||
1275 | fail_ns_lock: | |
01e2b670 | 1276 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
1277 | aa_put_namespace(ns); |
1278 | ||
1279 | fail: | |
1280 | (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error); | |
1281 | return error; | |
1282 | } |