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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); | |
c88d4c7b JJ |
144 | |
145 | return 1; | |
146 | } | |
147 | ||
148 | /** | |
149 | * policy_destroy - free the elements referenced by @policy | |
150 | * @policy: policy that is to have its elements freed (NOT NULL) | |
151 | */ | |
152 | static void policy_destroy(struct aa_policy *policy) | |
153 | { | |
154 | /* still contains profiles -- invalid */ | |
01e2b670 | 155 | if (on_list_rcu(&policy->profiles)) { |
c88d4c7b JJ |
156 | AA_ERROR("%s: internal error, " |
157 | "policy '%s' still contains profiles\n", | |
158 | __func__, policy->name); | |
159 | BUG(); | |
160 | } | |
01e2b670 | 161 | if (on_list_rcu(&policy->list)) { |
c88d4c7b JJ |
162 | AA_ERROR("%s: internal error, policy '%s' still on list\n", |
163 | __func__, policy->name); | |
164 | BUG(); | |
165 | } | |
166 | ||
167 | /* don't free name as its a subset of hname */ | |
168 | kzfree(policy->hname); | |
169 | } | |
170 | ||
171 | /** | |
172 | * __policy_find - find a policy by @name on a policy list | |
173 | * @head: list to search (NOT NULL) | |
174 | * @name: name to search for (NOT NULL) | |
175 | * | |
01e2b670 | 176 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
177 | * |
178 | * Returns: unrefcounted policy that match @name or NULL if not found | |
179 | */ | |
180 | static struct aa_policy *__policy_find(struct list_head *head, const char *name) | |
181 | { | |
182 | struct aa_policy *policy; | |
183 | ||
01e2b670 | 184 | list_for_each_entry_rcu(policy, head, list) { |
c88d4c7b JJ |
185 | if (!strcmp(policy->name, name)) |
186 | return policy; | |
187 | } | |
188 | return NULL; | |
189 | } | |
190 | ||
191 | /** | |
192 | * __policy_strn_find - find a policy that's name matches @len chars of @str | |
193 | * @head: list to search (NOT NULL) | |
194 | * @str: string to search for (NOT NULL) | |
195 | * @len: length of match required | |
196 | * | |
01e2b670 | 197 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
198 | * |
199 | * Returns: unrefcounted policy that match @str or NULL if not found | |
200 | * | |
201 | * if @len == strlen(@strlen) then this is equiv to __policy_find | |
202 | * other wise it allows searching for policy by a partial match of name | |
203 | */ | |
204 | static struct aa_policy *__policy_strn_find(struct list_head *head, | |
205 | const char *str, int len) | |
206 | { | |
207 | struct aa_policy *policy; | |
208 | ||
01e2b670 | 209 | list_for_each_entry_rcu(policy, head, list) { |
c88d4c7b JJ |
210 | if (aa_strneq(policy->name, str, len)) |
211 | return policy; | |
212 | } | |
213 | ||
214 | return NULL; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Routines for AppArmor namespaces | |
219 | */ | |
220 | ||
221 | static const char *hidden_ns_name = "---"; | |
222 | /** | |
223 | * aa_ns_visible - test if @view is visible from @curr | |
224 | * @curr: namespace to treat as the parent (NOT NULL) | |
225 | * @view: namespace to test if visible from @curr (NOT NULL) | |
226 | * | |
227 | * Returns: true if @view is visible from @curr else false | |
228 | */ | |
229 | bool aa_ns_visible(struct aa_namespace *curr, struct aa_namespace *view) | |
230 | { | |
231 | if (curr == view) | |
232 | return true; | |
233 | ||
234 | for ( ; view; view = view->parent) { | |
235 | if (view->parent == curr) | |
236 | return true; | |
237 | } | |
238 | return false; | |
239 | } | |
240 | ||
241 | /** | |
242 | * aa_na_name - Find the ns name to display for @view from @curr | |
243 | * @curr - current namespace (NOT NULL) | |
244 | * @view - namespace attempting to view (NOT NULL) | |
245 | * | |
246 | * Returns: name of @view visible from @curr | |
247 | */ | |
248 | const char *aa_ns_name(struct aa_namespace *curr, struct aa_namespace *view) | |
249 | { | |
250 | /* if view == curr then the namespace name isn't displayed */ | |
251 | if (curr == view) | |
252 | return ""; | |
253 | ||
254 | if (aa_ns_visible(curr, view)) { | |
255 | /* at this point if a ns is visible it is in a view ns | |
256 | * thus the curr ns.hname is a prefix of its name. | |
257 | * Only output the virtualized portion of the name | |
258 | * Add + 2 to skip over // separating curr hname prefix | |
259 | * from the visible tail of the views hname | |
260 | */ | |
261 | return view->base.hname + strlen(curr->base.hname) + 2; | |
262 | } else | |
263 | return hidden_ns_name; | |
264 | } | |
265 | ||
266 | /** | |
267 | * alloc_namespace - allocate, initialize and return a new namespace | |
268 | * @prefix: parent namespace name (MAYBE NULL) | |
269 | * @name: a preallocated name (NOT NULL) | |
270 | * | |
271 | * Returns: refcounted namespace or NULL on failure. | |
272 | */ | |
273 | static struct aa_namespace *alloc_namespace(const char *prefix, | |
274 | const char *name) | |
275 | { | |
276 | struct aa_namespace *ns; | |
277 | ||
278 | ns = kzalloc(sizeof(*ns), GFP_KERNEL); | |
279 | AA_DEBUG("%s(%p)\n", __func__, ns); | |
280 | if (!ns) | |
281 | return NULL; | |
282 | if (!policy_init(&ns->base, prefix, name)) | |
283 | goto fail_ns; | |
284 | ||
285 | INIT_LIST_HEAD(&ns->sub_ns); | |
01e2b670 | 286 | mutex_init(&ns->lock); |
c88d4c7b JJ |
287 | |
288 | /* released by free_namespace */ | |
289 | ns->unconfined = aa_alloc_profile("unconfined"); | |
290 | if (!ns->unconfined) | |
291 | goto fail_unconfined; | |
292 | ||
c88d4c7b | 293 | ns->unconfined->flags = PFLAG_UNCONFINED | PFLAG_IX_ON_NAME_ERROR | |
fa2ac468 | 294 | PFLAG_IMMUTABLE | PFLAG_NS_COUNT; |
c88d4c7b | 295 | |
fa2ac468 JJ |
296 | /* ns and ns->unconfined share ns->unconfined refcount */ |
297 | ns->unconfined->ns = ns; | |
c88d4c7b | 298 | |
a4987857 JJ |
299 | atomic_set(&ns->uniq_null, 0); |
300 | ||
c88d4c7b JJ |
301 | return ns; |
302 | ||
303 | fail_unconfined: | |
246c3fb1 | 304 | kzfree(ns->base.hname); |
c88d4c7b JJ |
305 | fail_ns: |
306 | kzfree(ns); | |
307 | return NULL; | |
308 | } | |
309 | ||
310 | /** | |
311 | * free_namespace - free a profile namespace | |
312 | * @ns: the namespace to free (MAYBE NULL) | |
313 | * | |
314 | * Requires: All references to the namespace must have been put, if the | |
315 | * namespace was referenced by a profile confining a task, | |
316 | */ | |
317 | static void free_namespace(struct aa_namespace *ns) | |
318 | { | |
319 | if (!ns) | |
320 | return; | |
321 | ||
322 | policy_destroy(&ns->base); | |
323 | aa_put_namespace(ns->parent); | |
324 | ||
fa2ac468 | 325 | ns->unconfined->ns = NULL; |
8651e1d6 | 326 | aa_free_profile(ns->unconfined); |
c88d4c7b JJ |
327 | kzfree(ns); |
328 | } | |
329 | ||
c88d4c7b JJ |
330 | /** |
331 | * __aa_find_namespace - find a namespace on a list by @name | |
332 | * @head: list to search for namespace on (NOT NULL) | |
333 | * @name: name of namespace to look for (NOT NULL) | |
334 | * | |
335 | * Returns: unrefcounted namespace | |
336 | * | |
01e2b670 | 337 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
338 | */ |
339 | static struct aa_namespace *__aa_find_namespace(struct list_head *head, | |
340 | const char *name) | |
341 | { | |
342 | return (struct aa_namespace *)__policy_find(head, name); | |
343 | } | |
344 | ||
345 | /** | |
346 | * aa_find_namespace - look up a profile namespace on the namespace list | |
347 | * @root: namespace to search in (NOT NULL) | |
348 | * @name: name of namespace to find (NOT NULL) | |
349 | * | |
350 | * Returns: a refcounted namespace on the list, or NULL if no namespace | |
351 | * called @name exists. | |
352 | * | |
353 | * refcount released by caller | |
354 | */ | |
355 | struct aa_namespace *aa_find_namespace(struct aa_namespace *root, | |
356 | const char *name) | |
357 | { | |
358 | struct aa_namespace *ns = NULL; | |
359 | ||
01e2b670 | 360 | rcu_read_lock(); |
c88d4c7b | 361 | ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name)); |
01e2b670 | 362 | rcu_read_unlock(); |
c88d4c7b JJ |
363 | |
364 | return ns; | |
365 | } | |
366 | ||
367 | /** | |
368 | * aa_prepare_namespace - find an existing or create a new namespace of @name | |
369 | * @name: the namespace to find or add (MAYBE NULL) | |
370 | * | |
371 | * Returns: refcounted namespace or NULL if failed to create one | |
372 | */ | |
373 | static struct aa_namespace *aa_prepare_namespace(const char *name) | |
374 | { | |
375 | struct aa_namespace *ns, *root; | |
376 | ||
377 | root = aa_current_profile()->ns; | |
378 | ||
01e2b670 | 379 | mutex_lock(&root->lock); |
c88d4c7b JJ |
380 | |
381 | /* if name isn't specified the profile is loaded to the current ns */ | |
382 | if (!name) { | |
383 | /* released by caller */ | |
384 | ns = aa_get_namespace(root); | |
385 | goto out; | |
386 | } | |
387 | ||
388 | /* try and find the specified ns and if it doesn't exist create it */ | |
389 | /* released by caller */ | |
390 | ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name)); | |
391 | if (!ns) { | |
01e2b670 JJ |
392 | ns = alloc_namespace(root->base.hname, name); |
393 | if (!ns) | |
394 | goto out; | |
395 | /* add parent ref */ | |
396 | ns->parent = aa_get_namespace(root); | |
397 | list_add_rcu(&ns->base.list, &root->sub_ns); | |
398 | /* add list ref */ | |
399 | aa_get_namespace(ns); | |
c88d4c7b JJ |
400 | } |
401 | out: | |
01e2b670 | 402 | mutex_unlock(&root->lock); |
c88d4c7b JJ |
403 | |
404 | /* return ref */ | |
405 | return ns; | |
406 | } | |
407 | ||
408 | /** | |
409 | * __list_add_profile - add a profile to a list | |
410 | * @list: list to add it to (NOT NULL) | |
411 | * @profile: the profile to add (NOT NULL) | |
412 | * | |
413 | * refcount @profile, should be put by __list_remove_profile | |
414 | * | |
415 | * Requires: namespace lock be held, or list not be shared | |
416 | */ | |
417 | static void __list_add_profile(struct list_head *list, | |
418 | struct aa_profile *profile) | |
419 | { | |
01e2b670 | 420 | list_add_rcu(&profile->base.list, list); |
c88d4c7b JJ |
421 | /* get list reference */ |
422 | aa_get_profile(profile); | |
423 | } | |
424 | ||
425 | /** | |
426 | * __list_remove_profile - remove a profile from the list it is on | |
427 | * @profile: the profile to remove (NOT NULL) | |
428 | * | |
429 | * remove a profile from the list, warning generally removal should | |
430 | * be done with __replace_profile as most profile removals are | |
431 | * replacements to the unconfined profile. | |
432 | * | |
433 | * put @profile list refcount | |
434 | * | |
435 | * Requires: namespace lock be held, or list not have been live | |
436 | */ | |
437 | static void __list_remove_profile(struct aa_profile *profile) | |
438 | { | |
01e2b670 JJ |
439 | list_del_rcu(&profile->base.list); |
440 | aa_put_profile(profile); | |
c88d4c7b JJ |
441 | } |
442 | ||
c88d4c7b JJ |
443 | static void __profile_list_release(struct list_head *head); |
444 | ||
445 | /** | |
446 | * __remove_profile - remove old profile, and children | |
447 | * @profile: profile to be replaced (NOT NULL) | |
448 | * | |
449 | * Requires: namespace list lock be held, or list not be shared | |
450 | */ | |
451 | static void __remove_profile(struct aa_profile *profile) | |
452 | { | |
453 | /* release any children lists first */ | |
454 | __profile_list_release(&profile->base.profiles); | |
455 | /* released by free_profile */ | |
77b071b3 | 456 | __aa_update_replacedby(profile, profile->ns->unconfined); |
c88d4c7b JJ |
457 | __list_remove_profile(profile); |
458 | } | |
459 | ||
460 | /** | |
461 | * __profile_list_release - remove all profiles on the list and put refs | |
462 | * @head: list of profiles (NOT NULL) | |
463 | * | |
464 | * Requires: namespace lock be held | |
465 | */ | |
466 | static void __profile_list_release(struct list_head *head) | |
467 | { | |
468 | struct aa_profile *profile, *tmp; | |
469 | list_for_each_entry_safe(profile, tmp, head, base.list) | |
470 | __remove_profile(profile); | |
471 | } | |
472 | ||
473 | static void __ns_list_release(struct list_head *head); | |
474 | ||
475 | /** | |
476 | * destroy_namespace - remove everything contained by @ns | |
477 | * @ns: namespace to have it contents removed (NOT NULL) | |
478 | */ | |
479 | static void destroy_namespace(struct aa_namespace *ns) | |
480 | { | |
481 | if (!ns) | |
482 | return; | |
483 | ||
01e2b670 | 484 | mutex_lock(&ns->lock); |
c88d4c7b JJ |
485 | /* release all profiles in this namespace */ |
486 | __profile_list_release(&ns->base.profiles); | |
487 | ||
488 | /* release all sub namespaces */ | |
489 | __ns_list_release(&ns->sub_ns); | |
490 | ||
01e2b670 | 491 | if (ns->parent) |
fa2ac468 | 492 | __aa_update_replacedby(ns->unconfined, ns->parent->unconfined); |
01e2b670 JJ |
493 | mutex_unlock(&ns->lock); |
494 | } | |
495 | ||
c88d4c7b JJ |
496 | /** |
497 | * __remove_namespace - remove a namespace and all its children | |
498 | * @ns: namespace to be removed (NOT NULL) | |
499 | * | |
500 | * Requires: ns->parent->lock be held and ns removed from parent. | |
501 | */ | |
502 | static void __remove_namespace(struct aa_namespace *ns) | |
503 | { | |
c88d4c7b | 504 | /* remove ns from namespace list */ |
01e2b670 | 505 | list_del_rcu(&ns->base.list); |
c88d4c7b | 506 | destroy_namespace(ns); |
fa2ac468 | 507 | aa_put_namespace(ns); |
c88d4c7b JJ |
508 | } |
509 | ||
510 | /** | |
511 | * __ns_list_release - remove all profile namespaces on the list put refs | |
512 | * @head: list of profile namespaces (NOT NULL) | |
513 | * | |
514 | * Requires: namespace lock be held | |
515 | */ | |
516 | static void __ns_list_release(struct list_head *head) | |
517 | { | |
518 | struct aa_namespace *ns, *tmp; | |
519 | list_for_each_entry_safe(ns, tmp, head, base.list) | |
520 | __remove_namespace(ns); | |
521 | ||
522 | } | |
523 | ||
524 | /** | |
525 | * aa_alloc_root_ns - allocate the root profile namespace | |
526 | * | |
527 | * Returns: %0 on success else error | |
528 | * | |
529 | */ | |
530 | int __init aa_alloc_root_ns(void) | |
531 | { | |
532 | /* released by aa_free_root_ns - used as list ref*/ | |
533 | root_ns = alloc_namespace(NULL, "root"); | |
534 | if (!root_ns) | |
535 | return -ENOMEM; | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
540 | /** | |
541 | * aa_free_root_ns - free the root profile namespace | |
542 | */ | |
543 | void __init aa_free_root_ns(void) | |
544 | { | |
545 | struct aa_namespace *ns = root_ns; | |
546 | root_ns = NULL; | |
547 | ||
548 | destroy_namespace(ns); | |
549 | aa_put_namespace(ns); | |
550 | } | |
551 | ||
77b071b3 JJ |
552 | |
553 | static void free_replacedby(struct aa_replacedby *r) | |
554 | { | |
555 | if (r) { | |
556 | aa_put_profile(rcu_dereference(r->profile)); | |
557 | kzfree(r); | |
558 | } | |
559 | } | |
560 | ||
561 | ||
562 | void aa_free_replacedby_kref(struct kref *kref) | |
563 | { | |
564 | struct aa_replacedby *r = container_of(kref, struct aa_replacedby, | |
565 | count); | |
566 | free_replacedby(r); | |
567 | } | |
568 | ||
c88d4c7b | 569 | /** |
8651e1d6 | 570 | * aa_free_profile - free a profile |
c88d4c7b JJ |
571 | * @profile: the profile to free (MAYBE NULL) |
572 | * | |
573 | * Free a profile, its hats and null_profile. All references to the profile, | |
574 | * its hats and null_profile must have been put. | |
575 | * | |
576 | * If the profile was referenced from a task context, free_profile() will | |
577 | * be called from an rcu callback routine, so we must not sleep here. | |
578 | */ | |
8651e1d6 | 579 | void aa_free_profile(struct aa_profile *profile) |
c88d4c7b JJ |
580 | { |
581 | AA_DEBUG("%s(%p)\n", __func__, profile); | |
582 | ||
583 | if (!profile) | |
584 | return; | |
585 | ||
c88d4c7b JJ |
586 | /* free children profiles */ |
587 | policy_destroy(&profile->base); | |
01e2b670 | 588 | aa_put_profile(rcu_access_pointer(profile->parent)); |
c88d4c7b JJ |
589 | |
590 | aa_put_namespace(profile->ns); | |
591 | kzfree(profile->rename); | |
592 | ||
593 | aa_free_file_rules(&profile->file); | |
594 | aa_free_cap_rules(&profile->caps); | |
595 | aa_free_rlimit_rules(&profile->rlimits); | |
596 | ||
c88d4c7b | 597 | aa_put_dfa(profile->xmatch); |
ad5ff3db | 598 | aa_put_dfa(profile->policy.dfa); |
77b071b3 | 599 | aa_put_replacedby(profile->replacedby); |
c88d4c7b JJ |
600 | |
601 | kzfree(profile); | |
602 | } | |
603 | ||
01e2b670 JJ |
604 | /** |
605 | * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref) | |
606 | * @head: rcu_head callback for freeing of a profile (NOT NULL) | |
607 | */ | |
608 | static void aa_free_profile_rcu(struct rcu_head *head) | |
609 | { | |
742058b0 JJ |
610 | struct aa_profile *p = container_of(head, struct aa_profile, rcu); |
611 | if (p->flags & PFLAG_NS_COUNT) | |
612 | free_namespace(p->ns); | |
613 | else | |
8651e1d6 | 614 | aa_free_profile(p); |
01e2b670 JJ |
615 | } |
616 | ||
c88d4c7b JJ |
617 | /** |
618 | * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile) | |
619 | * @kr: kref callback for freeing of a profile (NOT NULL) | |
620 | */ | |
621 | void aa_free_profile_kref(struct kref *kref) | |
622 | { | |
fa2ac468 | 623 | struct aa_profile *p = container_of(kref, struct aa_profile, count); |
742058b0 | 624 | call_rcu(&p->rcu, aa_free_profile_rcu); |
c88d4c7b JJ |
625 | } |
626 | ||
4da05cc0 JJ |
627 | /** |
628 | * aa_alloc_profile - allocate, initialize and return a new profile | |
629 | * @hname: name of the profile (NOT NULL) | |
630 | * | |
631 | * Returns: refcount profile or NULL on failure | |
632 | */ | |
633 | struct aa_profile *aa_alloc_profile(const char *hname) | |
634 | { | |
635 | struct aa_profile *profile; | |
636 | ||
637 | /* freed by free_profile - usually through aa_put_profile */ | |
638 | profile = kzalloc(sizeof(*profile), GFP_KERNEL); | |
639 | if (!profile) | |
640 | return NULL; | |
641 | ||
77b071b3 JJ |
642 | profile->replacedby = kzalloc(sizeof(struct aa_replacedby), GFP_KERNEL); |
643 | if (!profile->replacedby) | |
644 | goto fail; | |
645 | kref_init(&profile->replacedby->count); | |
646 | ||
647 | if (!policy_init(&profile->base, NULL, hname)) | |
648 | goto fail; | |
fa2ac468 | 649 | kref_init(&profile->count); |
4da05cc0 JJ |
650 | |
651 | /* refcount released by caller */ | |
652 | return profile; | |
77b071b3 JJ |
653 | |
654 | fail: | |
655 | kzfree(profile->replacedby); | |
656 | kzfree(profile); | |
657 | ||
658 | return NULL; | |
4da05cc0 JJ |
659 | } |
660 | ||
661 | /** | |
662 | * aa_new_null_profile - create a new null-X learning profile | |
663 | * @parent: profile that caused this profile to be created (NOT NULL) | |
664 | * @hat: true if the null- learning profile is a hat | |
665 | * | |
666 | * Create a null- complain mode profile used in learning mode. The name of | |
667 | * the profile is unique and follows the format of parent//null-<uniq>. | |
668 | * | |
669 | * null profiles are added to the profile list but the list does not | |
670 | * hold a count on them so that they are automatically released when | |
671 | * not in use. | |
672 | * | |
673 | * Returns: new refcounted profile else NULL on failure | |
674 | */ | |
675 | struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat) | |
676 | { | |
677 | struct aa_profile *profile = NULL; | |
678 | char *name; | |
679 | int uniq = atomic_inc_return(&parent->ns->uniq_null); | |
680 | ||
681 | /* freed below */ | |
682 | name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, GFP_KERNEL); | |
683 | if (!name) | |
684 | goto fail; | |
685 | sprintf(name, "%s//null-%x", parent->base.hname, uniq); | |
686 | ||
687 | profile = aa_alloc_profile(name); | |
688 | kfree(name); | |
689 | if (!profile) | |
690 | goto fail; | |
691 | ||
692 | profile->mode = APPARMOR_COMPLAIN; | |
693 | profile->flags = PFLAG_NULL; | |
694 | if (hat) | |
695 | profile->flags |= PFLAG_HAT; | |
696 | ||
697 | /* released on free_profile */ | |
01e2b670 | 698 | rcu_assign_pointer(profile->parent, aa_get_profile(parent)); |
4da05cc0 JJ |
699 | profile->ns = aa_get_namespace(parent->ns); |
700 | ||
01e2b670 | 701 | mutex_lock(&profile->ns->lock); |
4da05cc0 | 702 | __list_add_profile(&parent->base.profiles, profile); |
01e2b670 | 703 | mutex_unlock(&profile->ns->lock); |
4da05cc0 JJ |
704 | |
705 | /* refcount released by caller */ | |
706 | return profile; | |
707 | ||
708 | fail: | |
709 | return NULL; | |
710 | } | |
711 | ||
c88d4c7b JJ |
712 | /* TODO: profile accounting - setup in remove */ |
713 | ||
714 | /** | |
715 | * __find_child - find a profile on @head list with a name matching @name | |
716 | * @head: list to search (NOT NULL) | |
717 | * @name: name of profile (NOT NULL) | |
718 | * | |
01e2b670 | 719 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
720 | * |
721 | * Returns: unrefcounted profile ptr, or NULL if not found | |
722 | */ | |
723 | static struct aa_profile *__find_child(struct list_head *head, const char *name) | |
724 | { | |
725 | return (struct aa_profile *)__policy_find(head, name); | |
726 | } | |
727 | ||
728 | /** | |
729 | * __strn_find_child - find a profile on @head list using substring of @name | |
730 | * @head: list to search (NOT NULL) | |
731 | * @name: name of profile (NOT NULL) | |
732 | * @len: length of @name substring to match | |
733 | * | |
01e2b670 | 734 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
735 | * |
736 | * Returns: unrefcounted profile ptr, or NULL if not found | |
737 | */ | |
738 | static struct aa_profile *__strn_find_child(struct list_head *head, | |
739 | const char *name, int len) | |
740 | { | |
741 | return (struct aa_profile *)__policy_strn_find(head, name, len); | |
742 | } | |
743 | ||
744 | /** | |
745 | * aa_find_child - find a profile by @name in @parent | |
746 | * @parent: profile to search (NOT NULL) | |
747 | * @name: profile name to search for (NOT NULL) | |
748 | * | |
749 | * Returns: a refcounted profile or NULL if not found | |
750 | */ | |
751 | struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name) | |
752 | { | |
753 | struct aa_profile *profile; | |
754 | ||
01e2b670 | 755 | rcu_read_lock(); |
c88d4c7b | 756 | profile = aa_get_profile(__find_child(&parent->base.profiles, name)); |
01e2b670 | 757 | rcu_read_unlock(); |
c88d4c7b JJ |
758 | |
759 | /* refcount released by caller */ | |
760 | return profile; | |
761 | } | |
762 | ||
763 | /** | |
764 | * __lookup_parent - lookup the parent of a profile of name @hname | |
765 | * @ns: namespace to lookup profile in (NOT NULL) | |
766 | * @hname: hierarchical profile name to find parent of (NOT NULL) | |
767 | * | |
768 | * Lookups up the parent of a fully qualified profile name, the profile | |
769 | * that matches hname does not need to exist, in general this | |
770 | * is used to load a new profile. | |
771 | * | |
01e2b670 | 772 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
773 | * |
774 | * Returns: unrefcounted policy or NULL if not found | |
775 | */ | |
776 | static struct aa_policy *__lookup_parent(struct aa_namespace *ns, | |
777 | const char *hname) | |
778 | { | |
779 | struct aa_policy *policy; | |
780 | struct aa_profile *profile = NULL; | |
781 | char *split; | |
782 | ||
783 | policy = &ns->base; | |
784 | ||
785 | for (split = strstr(hname, "//"); split;) { | |
786 | profile = __strn_find_child(&policy->profiles, hname, | |
787 | split - hname); | |
788 | if (!profile) | |
789 | return NULL; | |
790 | policy = &profile->base; | |
791 | hname = split + 2; | |
792 | split = strstr(hname, "//"); | |
793 | } | |
794 | if (!profile) | |
795 | return &ns->base; | |
796 | return &profile->base; | |
797 | } | |
798 | ||
799 | /** | |
800 | * __lookup_profile - lookup the profile matching @hname | |
801 | * @base: base list to start looking up profile name from (NOT NULL) | |
802 | * @hname: hierarchical profile name (NOT NULL) | |
803 | * | |
01e2b670 | 804 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
805 | * |
806 | * Returns: unrefcounted profile pointer or NULL if not found | |
807 | * | |
808 | * Do a relative name lookup, recursing through profile tree. | |
809 | */ | |
810 | static struct aa_profile *__lookup_profile(struct aa_policy *base, | |
811 | const char *hname) | |
812 | { | |
813 | struct aa_profile *profile = NULL; | |
814 | char *split; | |
815 | ||
816 | for (split = strstr(hname, "//"); split;) { | |
817 | profile = __strn_find_child(&base->profiles, hname, | |
818 | split - hname); | |
819 | if (!profile) | |
820 | return NULL; | |
821 | ||
822 | base = &profile->base; | |
823 | hname = split + 2; | |
824 | split = strstr(hname, "//"); | |
825 | } | |
826 | ||
827 | profile = __find_child(&base->profiles, hname); | |
828 | ||
829 | return profile; | |
830 | } | |
831 | ||
832 | /** | |
833 | * aa_lookup_profile - find a profile by its full or partial name | |
834 | * @ns: the namespace to start from (NOT NULL) | |
835 | * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL) | |
836 | * | |
837 | * Returns: refcounted profile or NULL if not found | |
838 | */ | |
839 | struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *hname) | |
840 | { | |
841 | struct aa_profile *profile; | |
842 | ||
01e2b670 JJ |
843 | rcu_read_lock(); |
844 | do { | |
845 | profile = __lookup_profile(&ns->base, hname); | |
846 | } while (profile && !aa_get_profile_not0(profile)); | |
847 | rcu_read_unlock(); | |
c88d4c7b | 848 | |
bf83208e JJ |
849 | /* the unconfined profile is not in the regular profile list */ |
850 | if (!profile && strcmp(hname, "unconfined") == 0) | |
fa2ac468 | 851 | profile = aa_get_newest_profile(ns->unconfined); |
bf83208e | 852 | |
c88d4c7b JJ |
853 | /* refcount released by caller */ |
854 | return profile; | |
855 | } | |
856 | ||
857 | /** | |
858 | * replacement_allowed - test to see if replacement is allowed | |
859 | * @profile: profile to test if it can be replaced (MAYBE NULL) | |
860 | * @noreplace: true if replacement shouldn't be allowed but addition is okay | |
861 | * @info: Returns - info about why replacement failed (NOT NULL) | |
862 | * | |
863 | * Returns: %0 if replacement allowed else error code | |
864 | */ | |
865 | static int replacement_allowed(struct aa_profile *profile, int noreplace, | |
866 | const char **info) | |
867 | { | |
868 | if (profile) { | |
869 | if (profile->flags & PFLAG_IMMUTABLE) { | |
870 | *info = "cannot replace immutible profile"; | |
871 | return -EPERM; | |
872 | } else if (noreplace) { | |
873 | *info = "profile already exists"; | |
874 | return -EEXIST; | |
875 | } | |
876 | } | |
877 | return 0; | |
878 | } | |
879 | ||
c88d4c7b JJ |
880 | /** |
881 | * aa_audit_policy - Do auditing of policy changes | |
882 | * @op: policy operation being performed | |
883 | * @gfp: memory allocation flags | |
884 | * @name: name of profile being manipulated (NOT NULL) | |
885 | * @info: any extra information to be audited (MAYBE NULL) | |
886 | * @error: error code | |
887 | * | |
888 | * Returns: the error to be returned after audit is done | |
889 | */ | |
890 | static int audit_policy(int op, gfp_t gfp, const char *name, const char *info, | |
891 | int error) | |
892 | { | |
893 | struct common_audit_data sa; | |
3b3b0e4f | 894 | struct apparmor_audit_data aad = {0,}; |
50c205f5 | 895 | sa.type = LSM_AUDIT_DATA_NONE; |
3b3b0e4f EP |
896 | sa.aad = &aad; |
897 | aad.op = op; | |
898 | aad.name = name; | |
899 | aad.info = info; | |
900 | aad.error = error; | |
c88d4c7b JJ |
901 | |
902 | return aa_audit(AUDIT_APPARMOR_STATUS, __aa_current_profile(), gfp, | |
903 | &sa, NULL); | |
904 | } | |
905 | ||
906 | /** | |
907 | * aa_may_manage_policy - can the current task manage policy | |
908 | * @op: the policy manipulation operation being done | |
909 | * | |
910 | * Returns: true if the task is allowed to manipulate policy | |
911 | */ | |
912 | bool aa_may_manage_policy(int op) | |
913 | { | |
914 | /* check if loading policy is locked out */ | |
915 | if (aa_g_lock_policy) { | |
916 | audit_policy(op, GFP_KERNEL, NULL, "policy_locked", -EACCES); | |
917 | return 0; | |
918 | } | |
919 | ||
920 | if (!capable(CAP_MAC_ADMIN)) { | |
921 | audit_policy(op, GFP_KERNEL, NULL, "not policy admin", -EACCES); | |
922 | return 0; | |
923 | } | |
924 | ||
925 | return 1; | |
926 | } | |
927 | ||
dd51c848 JJ |
928 | static struct aa_profile *__list_lookup_parent(struct list_head *lh, |
929 | struct aa_profile *profile) | |
930 | { | |
931 | const char *base = hname_tail(profile->base.hname); | |
932 | long len = base - profile->base.hname; | |
933 | struct aa_load_ent *ent; | |
934 | ||
935 | /* parent won't have trailing // so remove from len */ | |
936 | if (len <= 2) | |
937 | return NULL; | |
938 | len -= 2; | |
939 | ||
940 | list_for_each_entry(ent, lh, list) { | |
941 | if (ent->new == profile) | |
942 | continue; | |
943 | if (strncmp(ent->new->base.hname, profile->base.hname, len) == | |
944 | 0 && ent->new->base.hname[len] == 0) | |
945 | return ent->new; | |
946 | } | |
947 | ||
948 | return NULL; | |
949 | } | |
950 | ||
951 | /** | |
952 | * __replace_profile - replace @old with @new on a list | |
953 | * @old: profile to be replaced (NOT NULL) | |
954 | * @new: profile to replace @old with (NOT NULL) | |
77b071b3 | 955 | * @share_replacedby: transfer @old->replacedby to @new |
dd51c848 JJ |
956 | * |
957 | * Will duplicate and refcount elements that @new inherits from @old | |
958 | * and will inherit @old children. | |
959 | * | |
960 | * refcount @new for list, put @old list refcount | |
961 | * | |
962 | * Requires: namespace list lock be held, or list not be shared | |
963 | */ | |
77b071b3 JJ |
964 | static void __replace_profile(struct aa_profile *old, struct aa_profile *new, |
965 | bool share_replacedby) | |
dd51c848 JJ |
966 | { |
967 | struct aa_profile *child, *tmp; | |
968 | ||
969 | if (!list_empty(&old->base.profiles)) { | |
970 | LIST_HEAD(lh); | |
01e2b670 | 971 | list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu); |
dd51c848 JJ |
972 | |
973 | list_for_each_entry_safe(child, tmp, &lh, base.list) { | |
974 | struct aa_profile *p; | |
975 | ||
976 | list_del_init(&child->base.list); | |
977 | p = __find_child(&new->base.profiles, child->base.name); | |
978 | if (p) { | |
979 | /* @p replaces @child */ | |
77b071b3 | 980 | __replace_profile(child, p, share_replacedby); |
dd51c848 JJ |
981 | continue; |
982 | } | |
983 | ||
984 | /* inherit @child and its children */ | |
985 | /* TODO: update hname of inherited children */ | |
986 | /* list refcount transferred to @new */ | |
01e2b670 JJ |
987 | p = rcu_dereference_protected(child->parent, |
988 | mutex_is_locked(&child->ns->lock)); | |
989 | rcu_assign_pointer(child->parent, aa_get_profile(new)); | |
990 | list_add_rcu(&child->base.list, &new->base.profiles); | |
991 | aa_put_profile(p); | |
dd51c848 JJ |
992 | } |
993 | } | |
994 | ||
01e2b670 JJ |
995 | if (!rcu_access_pointer(new->parent)) { |
996 | struct aa_profile *parent = rcu_dereference(old->parent); | |
997 | rcu_assign_pointer(new->parent, aa_get_profile(parent)); | |
998 | } | |
77b071b3 JJ |
999 | __aa_update_replacedby(old, new); |
1000 | if (share_replacedby) { | |
1001 | aa_put_replacedby(new->replacedby); | |
1002 | new->replacedby = aa_get_replacedby(old->replacedby); | |
1003 | } | |
dd51c848 JJ |
1004 | |
1005 | if (list_empty(&new->base.list)) { | |
1006 | /* new is not on a list already */ | |
01e2b670 | 1007 | list_replace_rcu(&old->base.list, &new->base.list); |
dd51c848 JJ |
1008 | aa_get_profile(new); |
1009 | aa_put_profile(old); | |
1010 | } else | |
1011 | __list_remove_profile(old); | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * __lookup_replace - lookup replacement information for a profile | |
1016 | * @ns - namespace the lookup occurs in | |
1017 | * @hname - name of profile to lookup | |
1018 | * @noreplace - true if not replacing an existing profile | |
1019 | * @p - Returns: profile to be replaced | |
1020 | * @info - Returns: info string on why lookup failed | |
1021 | * | |
1022 | * Returns: profile to replace (no ref) on success else ptr error | |
1023 | */ | |
1024 | static int __lookup_replace(struct aa_namespace *ns, const char *hname, | |
1025 | bool noreplace, struct aa_profile **p, | |
1026 | const char **info) | |
1027 | { | |
1028 | *p = aa_get_profile(__lookup_profile(&ns->base, hname)); | |
1029 | if (*p) { | |
1030 | int error = replacement_allowed(*p, noreplace, info); | |
1031 | if (error) { | |
1032 | *info = "profile can not be replaced"; | |
1033 | return error; | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | return 0; | |
1038 | } | |
1039 | ||
c88d4c7b JJ |
1040 | /** |
1041 | * aa_replace_profiles - replace profile(s) on the profile list | |
1042 | * @udata: serialized data stream (NOT NULL) | |
1043 | * @size: size of the serialized data stream | |
1044 | * @noreplace: true if only doing addition, no replacement allowed | |
1045 | * | |
1046 | * unpack and replace a profile on the profile list and uses of that profile | |
1047 | * by any aa_task_cxt. If the profile does not exist on the profile list | |
1048 | * it is added. | |
1049 | * | |
1050 | * Returns: size of data consumed else error code on failure. | |
1051 | */ | |
1052 | ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace) | |
1053 | { | |
c88d4c7b | 1054 | const char *ns_name, *name = NULL, *info = NULL; |
dd51c848 JJ |
1055 | struct aa_namespace *ns = NULL; |
1056 | struct aa_load_ent *ent, *tmp; | |
c88d4c7b JJ |
1057 | int op = OP_PROF_REPL; |
1058 | ssize_t error; | |
dd51c848 | 1059 | LIST_HEAD(lh); |
c88d4c7b JJ |
1060 | |
1061 | /* released below */ | |
dd51c848 JJ |
1062 | error = aa_unpack(udata, size, &lh, &ns_name); |
1063 | if (error) | |
1064 | goto out; | |
c88d4c7b JJ |
1065 | |
1066 | /* released below */ | |
1067 | ns = aa_prepare_namespace(ns_name); | |
1068 | if (!ns) { | |
1069 | info = "failed to prepare namespace"; | |
1070 | error = -ENOMEM; | |
1071 | name = ns_name; | |
1072 | goto fail; | |
1073 | } | |
1074 | ||
01e2b670 | 1075 | mutex_lock(&ns->lock); |
dd51c848 JJ |
1076 | /* setup parent and ns info */ |
1077 | list_for_each_entry(ent, &lh, list) { | |
1078 | struct aa_policy *policy; | |
1079 | ||
1080 | name = ent->new->base.hname; | |
1081 | error = __lookup_replace(ns, ent->new->base.hname, noreplace, | |
1082 | &ent->old, &info); | |
1083 | if (error) | |
1084 | goto fail_lock; | |
1085 | ||
1086 | if (ent->new->rename) { | |
1087 | error = __lookup_replace(ns, ent->new->rename, | |
1088 | noreplace, &ent->rename, | |
1089 | &info); | |
1090 | if (error) | |
1091 | goto fail_lock; | |
c88d4c7b | 1092 | } |
c88d4c7b | 1093 | |
dd51c848 JJ |
1094 | /* released when @new is freed */ |
1095 | ent->new->ns = aa_get_namespace(ns); | |
1096 | ||
1097 | if (ent->old || ent->rename) | |
1098 | continue; | |
1099 | ||
1100 | /* no ref on policy only use inside lock */ | |
1101 | policy = __lookup_parent(ns, ent->new->base.hname); | |
1102 | if (!policy) { | |
1103 | struct aa_profile *p; | |
1104 | p = __list_lookup_parent(&lh, ent->new); | |
1105 | if (!p) { | |
1106 | error = -ENOENT; | |
1107 | info = "parent does not exist"; | |
1108 | name = ent->new->base.hname; | |
1109 | goto fail_lock; | |
1110 | } | |
01e2b670 JJ |
1111 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); |
1112 | } else if (policy != &ns->base) { | |
dd51c848 | 1113 | /* released on profile replacement or free_profile */ |
01e2b670 JJ |
1114 | struct aa_profile *p = (struct aa_profile *) policy; |
1115 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); | |
1116 | } | |
dd51c848 | 1117 | } |
c88d4c7b | 1118 | |
dd51c848 JJ |
1119 | /* do actual replacement */ |
1120 | list_for_each_entry_safe(ent, tmp, &lh, list) { | |
1121 | list_del_init(&ent->list); | |
1122 | op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL; | |
1123 | ||
1124 | audit_policy(op, GFP_ATOMIC, ent->new->base.name, NULL, error); | |
1125 | ||
1126 | if (ent->old) { | |
77b071b3 | 1127 | __replace_profile(ent->old, ent->new, 1); |
dd51c848 | 1128 | if (ent->rename) |
77b071b3 | 1129 | __replace_profile(ent->rename, ent->new, 0); |
dd51c848 | 1130 | } else if (ent->rename) { |
77b071b3 | 1131 | __replace_profile(ent->rename, ent->new, 0); |
dd51c848 | 1132 | } else if (ent->new->parent) { |
01e2b670 JJ |
1133 | struct aa_profile *parent, *newest; |
1134 | parent = rcu_dereference_protected(ent->new->parent, | |
1135 | mutex_is_locked(&ns->lock)); | |
77b071b3 | 1136 | newest = aa_get_newest_profile(parent); |
01e2b670 | 1137 | |
dd51c848 | 1138 | /* parent replaced in this atomic set? */ |
01e2b670 JJ |
1139 | if (newest != parent) { |
1140 | aa_get_profile(newest); | |
1141 | aa_put_profile(parent); | |
1142 | rcu_assign_pointer(ent->new->parent, newest); | |
77b071b3 JJ |
1143 | } else |
1144 | aa_put_profile(newest); | |
dd51c848 JJ |
1145 | __list_add_profile(&parent->base.profiles, ent->new); |
1146 | } else | |
1147 | __list_add_profile(&ns->base.profiles, ent->new); | |
c88d4c7b | 1148 | |
dd51c848 | 1149 | aa_load_ent_free(ent); |
c88d4c7b | 1150 | } |
01e2b670 | 1151 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
1152 | |
1153 | out: | |
1154 | aa_put_namespace(ns); | |
dd51c848 | 1155 | |
c88d4c7b JJ |
1156 | if (error) |
1157 | return error; | |
1158 | return size; | |
1159 | ||
dd51c848 | 1160 | fail_lock: |
01e2b670 | 1161 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
1162 | fail: |
1163 | error = audit_policy(op, GFP_KERNEL, name, info, error); | |
dd51c848 JJ |
1164 | |
1165 | list_for_each_entry_safe(ent, tmp, &lh, list) { | |
1166 | list_del_init(&ent->list); | |
1167 | aa_load_ent_free(ent); | |
1168 | } | |
1169 | ||
c88d4c7b JJ |
1170 | goto out; |
1171 | } | |
1172 | ||
1173 | /** | |
1174 | * aa_remove_profiles - remove profile(s) from the system | |
1175 | * @fqname: name of the profile or namespace to remove (NOT NULL) | |
1176 | * @size: size of the name | |
1177 | * | |
1178 | * Remove a profile or sub namespace from the current namespace, so that | |
1179 | * they can not be found anymore and mark them as replaced by unconfined | |
1180 | * | |
1181 | * NOTE: removing confinement does not restore rlimits to preconfinemnet values | |
1182 | * | |
1183 | * Returns: size of data consume else error code if fails | |
1184 | */ | |
1185 | ssize_t aa_remove_profiles(char *fqname, size_t size) | |
1186 | { | |
1187 | struct aa_namespace *root, *ns = NULL; | |
1188 | struct aa_profile *profile = NULL; | |
1189 | const char *name = fqname, *info = NULL; | |
1190 | ssize_t error = 0; | |
1191 | ||
1192 | if (*fqname == 0) { | |
1193 | info = "no profile specified"; | |
1194 | error = -ENOENT; | |
1195 | goto fail; | |
1196 | } | |
1197 | ||
1198 | root = aa_current_profile()->ns; | |
1199 | ||
1200 | if (fqname[0] == ':') { | |
1201 | char *ns_name; | |
1202 | name = aa_split_fqname(fqname, &ns_name); | |
41d1b3e8 JJ |
1203 | /* released below */ |
1204 | ns = aa_find_namespace(root, ns_name); | |
1205 | if (!ns) { | |
1206 | info = "namespace does not exist"; | |
1207 | error = -ENOENT; | |
1208 | goto fail; | |
c88d4c7b JJ |
1209 | } |
1210 | } else | |
1211 | /* released below */ | |
1212 | ns = aa_get_namespace(root); | |
1213 | ||
c88d4c7b JJ |
1214 | if (!name) { |
1215 | /* remove namespace - can only happen if fqname[0] == ':' */ | |
01e2b670 | 1216 | mutex_lock(&ns->parent->lock); |
c88d4c7b | 1217 | __remove_namespace(ns); |
01e2b670 | 1218 | mutex_unlock(&ns->parent->lock); |
c88d4c7b JJ |
1219 | } else { |
1220 | /* remove profile */ | |
01e2b670 | 1221 | mutex_lock(&ns->lock); |
c88d4c7b JJ |
1222 | profile = aa_get_profile(__lookup_profile(&ns->base, name)); |
1223 | if (!profile) { | |
1224 | error = -ENOENT; | |
1225 | info = "profile does not exist"; | |
1226 | goto fail_ns_lock; | |
1227 | } | |
1228 | name = profile->base.hname; | |
1229 | __remove_profile(profile); | |
01e2b670 | 1230 | mutex_unlock(&ns->lock); |
c88d4c7b | 1231 | } |
c88d4c7b JJ |
1232 | |
1233 | /* don't fail removal if audit fails */ | |
1234 | (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error); | |
1235 | aa_put_namespace(ns); | |
1236 | aa_put_profile(profile); | |
1237 | return size; | |
1238 | ||
1239 | fail_ns_lock: | |
01e2b670 | 1240 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
1241 | aa_put_namespace(ns); |
1242 | ||
1243 | fail: | |
1244 | (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error); | |
1245 | return error; | |
1246 | } |