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John Johansenc88d4c72010-07-29 14:48:00 -07001/*
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"
John Johansenc88d4c72010-07-29 14:48:00 -070090
91
92/* root profile namespace */
93struct aa_namespace *root_ns;
94
John Johansen0d259f02013-07-10 21:13:43 -070095const char *const aa_profile_mode_names[] = {
John Johansenc88d4c72010-07-29 14:48:00 -070096 "enforce",
97 "complain",
98 "kill",
John Johansen03816502013-07-10 21:12:43 -070099 "unconfined",
John Johansenc88d4c72010-07-29 14:48:00 -0700100};
101
102/**
103 * hname_tail - find the last component of an hname
104 * @name: hname to find the base profile name component of (NOT NULL)
105 *
106 * Returns: the tail (base profile name) name component of an hname
107 */
108static const char *hname_tail(const char *hname)
109{
110 char *split;
111 hname = strim((char *)hname);
112 for (split = strstr(hname, "//"); split; split = strstr(hname, "//"))
113 hname = split + 2;
114
115 return hname;
116}
117
118/**
119 * policy_init - initialize a policy structure
120 * @policy: policy to initialize (NOT NULL)
121 * @prefix: prefix name if any is required. (MAYBE NULL)
122 * @name: name of the policy, init will make a copy of it (NOT NULL)
123 *
124 * Note: this fn creates a copy of strings passed in
125 *
126 * Returns: true if policy init successful
127 */
128static bool policy_init(struct aa_policy *policy, const char *prefix,
129 const char *name)
130{
131 /* freed by policy_free */
132 if (prefix) {
133 policy->hname = kmalloc(strlen(prefix) + strlen(name) + 3,
134 GFP_KERNEL);
135 if (policy->hname)
136 sprintf(policy->hname, "%s//%s", prefix, name);
137 } else
138 policy->hname = kstrdup(name, GFP_KERNEL);
139 if (!policy->hname)
140 return 0;
141 /* base.name is a substring of fqname */
142 policy->name = (char *)hname_tail(policy->hname);
143 INIT_LIST_HEAD(&policy->list);
144 INIT_LIST_HEAD(&policy->profiles);
John Johansenc88d4c72010-07-29 14:48:00 -0700145
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 */
153static void policy_destroy(struct aa_policy *policy)
154{
155 /* still contains profiles -- invalid */
John Johansen01e2b672013-07-10 21:06:43 -0700156 if (on_list_rcu(&policy->profiles)) {
John Johansenc88d4c72010-07-29 14:48:00 -0700157 AA_ERROR("%s: internal error, "
158 "policy '%s' still contains profiles\n",
159 __func__, policy->name);
160 BUG();
161 }
John Johansen01e2b672013-07-10 21:06:43 -0700162 if (on_list_rcu(&policy->list)) {
John Johansenc88d4c72010-07-29 14:48:00 -0700163 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 *
John Johansen01e2b672013-07-10 21:06:43 -0700177 * Requires: rcu_read_lock be held
John Johansenc88d4c72010-07-29 14:48:00 -0700178 *
179 * Returns: unrefcounted policy that match @name or NULL if not found
180 */
181static struct aa_policy *__policy_find(struct list_head *head, const char *name)
182{
183 struct aa_policy *policy;
184
John Johansen01e2b672013-07-10 21:06:43 -0700185 list_for_each_entry_rcu(policy, head, list) {
John Johansenc88d4c72010-07-29 14:48:00 -0700186 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 *
John Johansen01e2b672013-07-10 21:06:43 -0700198 * Requires: rcu_read_lock be held
John Johansenc88d4c72010-07-29 14:48:00 -0700199 *
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 */
205static struct aa_policy *__policy_strn_find(struct list_head *head,
206 const char *str, int len)
207{
208 struct aa_policy *policy;
209
John Johansen01e2b672013-07-10 21:06:43 -0700210 list_for_each_entry_rcu(policy, head, list) {
John Johansenc88d4c72010-07-29 14:48:00 -0700211 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
222static 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 */
230bool 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 */
249const 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 */
274static 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);
John Johansen01e2b672013-07-10 21:06:43 -0700287 mutex_init(&ns->lock);
John Johansenc88d4c72010-07-29 14:48:00 -0700288
289 /* released by free_namespace */
290 ns->unconfined = aa_alloc_profile("unconfined");
291 if (!ns->unconfined)
292 goto fail_unconfined;
293
John Johansen03816502013-07-10 21:12:43 -0700294 ns->unconfined->flags = PFLAG_IX_ON_NAME_ERROR |
295 PFLAG_IMMUTABLE | PFLAG_NS_COUNT;
296 ns->unconfined->mode = APPARMOR_UNCONFINED;
John Johansenc88d4c72010-07-29 14:48:00 -0700297
John Johansenfa2ac462013-07-10 21:08:43 -0700298 /* ns and ns->unconfined share ns->unconfined refcount */
299 ns->unconfined->ns = ns;
John Johansenc88d4c72010-07-29 14:48:00 -0700300
John Johansena4987852013-02-18 16:10:34 -0800301 atomic_set(&ns->uniq_null, 0);
302
John Johansenc88d4c72010-07-29 14:48:00 -0700303 return ns;
304
305fail_unconfined:
wzt.wzt@gmail.com246c3fb2010-11-10 11:31:55 +0800306 kzfree(ns->base.hname);
John Johansenc88d4c72010-07-29 14:48:00 -0700307fail_ns:
308 kzfree(ns);
309 return NULL;
310}
311
312/**
313 * free_namespace - free a profile namespace
314 * @ns: the namespace to free (MAYBE NULL)
315 *
316 * Requires: All references to the namespace must have been put, if the
317 * namespace was referenced by a profile confining a task,
318 */
319static void free_namespace(struct aa_namespace *ns)
320{
321 if (!ns)
322 return;
323
324 policy_destroy(&ns->base);
325 aa_put_namespace(ns->parent);
326
John Johansenfa2ac462013-07-10 21:08:43 -0700327 ns->unconfined->ns = NULL;
John Johansen8651e1d62013-07-10 21:11:43 -0700328 aa_free_profile(ns->unconfined);
John Johansenc88d4c72010-07-29 14:48:00 -0700329 kzfree(ns);
330}
331
332/**
John Johansenc88d4c72010-07-29 14:48:00 -0700333 * __aa_find_namespace - find a namespace on a list by @name
334 * @head: list to search for namespace on (NOT NULL)
335 * @name: name of namespace to look for (NOT NULL)
336 *
337 * Returns: unrefcounted namespace
338 *
John Johansen01e2b672013-07-10 21:06:43 -0700339 * Requires: rcu_read_lock be held
John Johansenc88d4c72010-07-29 14:48:00 -0700340 */
341static struct aa_namespace *__aa_find_namespace(struct list_head *head,
342 const char *name)
343{
344 return (struct aa_namespace *)__policy_find(head, name);
345}
346
347/**
348 * aa_find_namespace - look up a profile namespace on the namespace list
349 * @root: namespace to search in (NOT NULL)
350 * @name: name of namespace to find (NOT NULL)
351 *
352 * Returns: a refcounted namespace on the list, or NULL if no namespace
353 * called @name exists.
354 *
355 * refcount released by caller
356 */
357struct aa_namespace *aa_find_namespace(struct aa_namespace *root,
358 const char *name)
359{
360 struct aa_namespace *ns = NULL;
361
John Johansen01e2b672013-07-10 21:06:43 -0700362 rcu_read_lock();
John Johansenc88d4c72010-07-29 14:48:00 -0700363 ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name));
John Johansen01e2b672013-07-10 21:06:43 -0700364 rcu_read_unlock();
John Johansenc88d4c72010-07-29 14:48:00 -0700365
366 return ns;
367}
368
369/**
370 * aa_prepare_namespace - find an existing or create a new namespace of @name
371 * @name: the namespace to find or add (MAYBE NULL)
372 *
373 * Returns: refcounted namespace or NULL if failed to create one
374 */
375static struct aa_namespace *aa_prepare_namespace(const char *name)
376{
377 struct aa_namespace *ns, *root;
378
379 root = aa_current_profile()->ns;
380
John Johansen01e2b672013-07-10 21:06:43 -0700381 mutex_lock(&root->lock);
John Johansenc88d4c72010-07-29 14:48:00 -0700382
383 /* if name isn't specified the profile is loaded to the current ns */
384 if (!name) {
385 /* released by caller */
386 ns = aa_get_namespace(root);
387 goto out;
388 }
389
390 /* try and find the specified ns and if it doesn't exist create it */
391 /* released by caller */
392 ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name));
393 if (!ns) {
John Johansen01e2b672013-07-10 21:06:43 -0700394 ns = alloc_namespace(root->base.hname, name);
395 if (!ns)
396 goto out;
John Johansen0d259f02013-07-10 21:13:43 -0700397 if (__aa_fs_namespace_mkdir(ns, ns_subns_dir(root), name)) {
398 AA_ERROR("Failed to create interface for ns %s\n",
399 ns->base.name);
400 free_namespace(ns);
401 ns = NULL;
402 goto out;
403 }
John Johansen01e2b672013-07-10 21:06:43 -0700404 ns->parent = aa_get_namespace(root);
405 list_add_rcu(&ns->base.list, &root->sub_ns);
406 /* add list ref */
407 aa_get_namespace(ns);
John Johansenc88d4c72010-07-29 14:48:00 -0700408 }
409out:
John Johansen01e2b672013-07-10 21:06:43 -0700410 mutex_unlock(&root->lock);
John Johansenc88d4c72010-07-29 14:48:00 -0700411
412 /* return ref */
413 return ns;
414}
415
416/**
417 * __list_add_profile - add a profile to a list
418 * @list: list to add it to (NOT NULL)
419 * @profile: the profile to add (NOT NULL)
420 *
421 * refcount @profile, should be put by __list_remove_profile
422 *
423 * Requires: namespace lock be held, or list not be shared
424 */
425static void __list_add_profile(struct list_head *list,
426 struct aa_profile *profile)
427{
John Johansen01e2b672013-07-10 21:06:43 -0700428 list_add_rcu(&profile->base.list, list);
John Johansenc88d4c72010-07-29 14:48:00 -0700429 /* get list reference */
430 aa_get_profile(profile);
431}
432
433/**
434 * __list_remove_profile - remove a profile from the list it is on
435 * @profile: the profile to remove (NOT NULL)
436 *
437 * remove a profile from the list, warning generally removal should
438 * be done with __replace_profile as most profile removals are
439 * replacements to the unconfined profile.
440 *
441 * put @profile list refcount
442 *
443 * Requires: namespace lock be held, or list not have been live
444 */
445static void __list_remove_profile(struct aa_profile *profile)
446{
John Johansen01e2b672013-07-10 21:06:43 -0700447 list_del_rcu(&profile->base.list);
448 aa_put_profile(profile);
John Johansenc88d4c72010-07-29 14:48:00 -0700449}
450
John Johansenc88d4c72010-07-29 14:48:00 -0700451static void __profile_list_release(struct list_head *head);
452
453/**
454 * __remove_profile - remove old profile, and children
455 * @profile: profile to be replaced (NOT NULL)
456 *
457 * Requires: namespace list lock be held, or list not be shared
458 */
459static void __remove_profile(struct aa_profile *profile)
460{
461 /* release any children lists first */
462 __profile_list_release(&profile->base.profiles);
463 /* released by free_profile */
John Johansen77b071b2013-07-10 21:07:43 -0700464 __aa_update_replacedby(profile, profile->ns->unconfined);
John Johansen0d259f02013-07-10 21:13:43 -0700465 __aa_fs_profile_rmdir(profile);
John Johansenc88d4c72010-07-29 14:48:00 -0700466 __list_remove_profile(profile);
467}
468
469/**
470 * __profile_list_release - remove all profiles on the list and put refs
471 * @head: list of profiles (NOT NULL)
472 *
473 * Requires: namespace lock be held
474 */
475static void __profile_list_release(struct list_head *head)
476{
477 struct aa_profile *profile, *tmp;
478 list_for_each_entry_safe(profile, tmp, head, base.list)
479 __remove_profile(profile);
480}
481
482static void __ns_list_release(struct list_head *head);
483
484/**
485 * destroy_namespace - remove everything contained by @ns
486 * @ns: namespace to have it contents removed (NOT NULL)
487 */
488static void destroy_namespace(struct aa_namespace *ns)
489{
490 if (!ns)
491 return;
492
John Johansen01e2b672013-07-10 21:06:43 -0700493 mutex_lock(&ns->lock);
John Johansenc88d4c72010-07-29 14:48:00 -0700494 /* release all profiles in this namespace */
495 __profile_list_release(&ns->base.profiles);
496
497 /* release all sub namespaces */
498 __ns_list_release(&ns->sub_ns);
499
John Johansen01e2b672013-07-10 21:06:43 -0700500 if (ns->parent)
John Johansenfa2ac462013-07-10 21:08:43 -0700501 __aa_update_replacedby(ns->unconfined, ns->parent->unconfined);
John Johansen0d259f02013-07-10 21:13:43 -0700502 __aa_fs_namespace_rmdir(ns);
John Johansen01e2b672013-07-10 21:06:43 -0700503 mutex_unlock(&ns->lock);
504}
505
John Johansenc88d4c72010-07-29 14:48:00 -0700506/**
507 * __remove_namespace - remove a namespace and all its children
508 * @ns: namespace to be removed (NOT NULL)
509 *
510 * Requires: ns->parent->lock be held and ns removed from parent.
511 */
512static void __remove_namespace(struct aa_namespace *ns)
513{
John Johansenc88d4c72010-07-29 14:48:00 -0700514 /* remove ns from namespace list */
John Johansen01e2b672013-07-10 21:06:43 -0700515 list_del_rcu(&ns->base.list);
John Johansenc88d4c72010-07-29 14:48:00 -0700516 destroy_namespace(ns);
John Johansenfa2ac462013-07-10 21:08:43 -0700517 aa_put_namespace(ns);
John Johansenc88d4c72010-07-29 14:48:00 -0700518}
519
520/**
521 * __ns_list_release - remove all profile namespaces on the list put refs
522 * @head: list of profile namespaces (NOT NULL)
523 *
524 * Requires: namespace lock be held
525 */
526static void __ns_list_release(struct list_head *head)
527{
528 struct aa_namespace *ns, *tmp;
529 list_for_each_entry_safe(ns, tmp, head, base.list)
530 __remove_namespace(ns);
531
532}
533
534/**
535 * aa_alloc_root_ns - allocate the root profile namespace
536 *
537 * Returns: %0 on success else error
538 *
539 */
540int __init aa_alloc_root_ns(void)
541{
542 /* released by aa_free_root_ns - used as list ref*/
543 root_ns = alloc_namespace(NULL, "root");
544 if (!root_ns)
545 return -ENOMEM;
546
547 return 0;
548}
549
550 /**
551 * aa_free_root_ns - free the root profile namespace
552 */
553void __init aa_free_root_ns(void)
554 {
555 struct aa_namespace *ns = root_ns;
556 root_ns = NULL;
557
558 destroy_namespace(ns);
559 aa_put_namespace(ns);
560}
561
John Johansen77b071b2013-07-10 21:07:43 -0700562
563static void free_replacedby(struct aa_replacedby *r)
564{
565 if (r) {
John Johansen4cd4fc72013-09-29 08:39:22 -0700566 /* r->profile will not be updated any more as r is dead */
567 aa_put_profile(rcu_dereference_protected(r->profile, true));
John Johansen77b071b2013-07-10 21:07:43 -0700568 kzfree(r);
569 }
570}
571
572
573void aa_free_replacedby_kref(struct kref *kref)
574{
575 struct aa_replacedby *r = container_of(kref, struct aa_replacedby,
576 count);
577 free_replacedby(r);
578}
579
John Johansenc88d4c72010-07-29 14:48:00 -0700580/**
John Johansen8651e1d62013-07-10 21:11:43 -0700581 * aa_free_profile - free a profile
John Johansenc88d4c72010-07-29 14:48:00 -0700582 * @profile: the profile to free (MAYBE NULL)
583 *
584 * Free a profile, its hats and null_profile. All references to the profile,
585 * its hats and null_profile must have been put.
586 *
587 * If the profile was referenced from a task context, free_profile() will
588 * be called from an rcu callback routine, so we must not sleep here.
589 */
John Johansen8651e1d62013-07-10 21:11:43 -0700590void aa_free_profile(struct aa_profile *profile)
John Johansenc88d4c72010-07-29 14:48:00 -0700591{
592 AA_DEBUG("%s(%p)\n", __func__, profile);
593
594 if (!profile)
595 return;
596
John Johansenc88d4c72010-07-29 14:48:00 -0700597 /* free children profiles */
598 policy_destroy(&profile->base);
John Johansen01e2b672013-07-10 21:06:43 -0700599 aa_put_profile(rcu_access_pointer(profile->parent));
John Johansenc88d4c72010-07-29 14:48:00 -0700600
601 aa_put_namespace(profile->ns);
602 kzfree(profile->rename);
603
604 aa_free_file_rules(&profile->file);
605 aa_free_cap_rules(&profile->caps);
606 aa_free_rlimit_rules(&profile->rlimits);
607
John Johansen0d259f02013-07-10 21:13:43 -0700608 kzfree(profile->dirname);
John Johansenc88d4c72010-07-29 14:48:00 -0700609 aa_put_dfa(profile->xmatch);
John Johansenad5ff3d2012-02-16 07:07:53 -0800610 aa_put_dfa(profile->policy.dfa);
John Johansen77b071b2013-07-10 21:07:43 -0700611 aa_put_replacedby(profile->replacedby);
John Johansenc88d4c72010-07-29 14:48:00 -0700612
John Johansen5cb3e912013-10-14 11:44:34 -0700613 kzfree(profile->hash);
John Johansenc88d4c72010-07-29 14:48:00 -0700614 kzfree(profile);
615}
616
617/**
John Johansen01e2b672013-07-10 21:06:43 -0700618 * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref)
619 * @head: rcu_head callback for freeing of a profile (NOT NULL)
620 */
621static void aa_free_profile_rcu(struct rcu_head *head)
622{
John Johansen742058b2013-07-10 21:10:43 -0700623 struct aa_profile *p = container_of(head, struct aa_profile, rcu);
624 if (p->flags & PFLAG_NS_COUNT)
625 free_namespace(p->ns);
626 else
John Johansen8651e1d62013-07-10 21:11:43 -0700627 aa_free_profile(p);
John Johansen01e2b672013-07-10 21:06:43 -0700628}
629
630/**
John Johansenc88d4c72010-07-29 14:48:00 -0700631 * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile)
632 * @kr: kref callback for freeing of a profile (NOT NULL)
633 */
634void aa_free_profile_kref(struct kref *kref)
635{
John Johansenfa2ac462013-07-10 21:08:43 -0700636 struct aa_profile *p = container_of(kref, struct aa_profile, count);
John Johansen742058b2013-07-10 21:10:43 -0700637 call_rcu(&p->rcu, aa_free_profile_rcu);
John Johansenc88d4c72010-07-29 14:48:00 -0700638}
639
John Johansen4da05cc2013-02-18 16:11:34 -0800640/**
641 * aa_alloc_profile - allocate, initialize and return a new profile
642 * @hname: name of the profile (NOT NULL)
643 *
644 * Returns: refcount profile or NULL on failure
645 */
646struct aa_profile *aa_alloc_profile(const char *hname)
647{
648 struct aa_profile *profile;
649
650 /* freed by free_profile - usually through aa_put_profile */
651 profile = kzalloc(sizeof(*profile), GFP_KERNEL);
652 if (!profile)
653 return NULL;
654
John Johansen77b071b2013-07-10 21:07:43 -0700655 profile->replacedby = kzalloc(sizeof(struct aa_replacedby), GFP_KERNEL);
656 if (!profile->replacedby)
657 goto fail;
658 kref_init(&profile->replacedby->count);
659
660 if (!policy_init(&profile->base, NULL, hname))
661 goto fail;
John Johansenfa2ac462013-07-10 21:08:43 -0700662 kref_init(&profile->count);
John Johansen4da05cc2013-02-18 16:11:34 -0800663
664 /* refcount released by caller */
665 return profile;
John Johansen77b071b2013-07-10 21:07:43 -0700666
667fail:
668 kzfree(profile->replacedby);
669 kzfree(profile);
670
671 return NULL;
John Johansen4da05cc2013-02-18 16:11:34 -0800672}
673
674/**
675 * aa_new_null_profile - create a new null-X learning profile
676 * @parent: profile that caused this profile to be created (NOT NULL)
677 * @hat: true if the null- learning profile is a hat
678 *
679 * Create a null- complain mode profile used in learning mode. The name of
680 * the profile is unique and follows the format of parent//null-<uniq>.
681 *
682 * null profiles are added to the profile list but the list does not
683 * hold a count on them so that they are automatically released when
684 * not in use.
685 *
686 * Returns: new refcounted profile else NULL on failure
687 */
688struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat)
689{
690 struct aa_profile *profile = NULL;
691 char *name;
692 int uniq = atomic_inc_return(&parent->ns->uniq_null);
693
694 /* freed below */
695 name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, GFP_KERNEL);
696 if (!name)
697 goto fail;
698 sprintf(name, "%s//null-%x", parent->base.hname, uniq);
699
700 profile = aa_alloc_profile(name);
701 kfree(name);
702 if (!profile)
703 goto fail;
704
705 profile->mode = APPARMOR_COMPLAIN;
706 profile->flags = PFLAG_NULL;
707 if (hat)
708 profile->flags |= PFLAG_HAT;
709
710 /* released on free_profile */
John Johansen01e2b672013-07-10 21:06:43 -0700711 rcu_assign_pointer(profile->parent, aa_get_profile(parent));
John Johansen4da05cc2013-02-18 16:11:34 -0800712 profile->ns = aa_get_namespace(parent->ns);
713
John Johansen01e2b672013-07-10 21:06:43 -0700714 mutex_lock(&profile->ns->lock);
John Johansen4da05cc2013-02-18 16:11:34 -0800715 __list_add_profile(&parent->base.profiles, profile);
John Johansen01e2b672013-07-10 21:06:43 -0700716 mutex_unlock(&profile->ns->lock);
John Johansen4da05cc2013-02-18 16:11:34 -0800717
718 /* refcount released by caller */
719 return profile;
720
721fail:
722 return NULL;
723}
724
John Johansenc88d4c72010-07-29 14:48:00 -0700725/* TODO: profile accounting - setup in remove */
726
727/**
728 * __find_child - find a profile on @head list with a name matching @name
729 * @head: list to search (NOT NULL)
730 * @name: name of profile (NOT NULL)
731 *
John Johansen01e2b672013-07-10 21:06:43 -0700732 * Requires: rcu_read_lock be held
John Johansenc88d4c72010-07-29 14:48:00 -0700733 *
734 * Returns: unrefcounted profile ptr, or NULL if not found
735 */
736static struct aa_profile *__find_child(struct list_head *head, const char *name)
737{
738 return (struct aa_profile *)__policy_find(head, name);
739}
740
741/**
742 * __strn_find_child - find a profile on @head list using substring of @name
743 * @head: list to search (NOT NULL)
744 * @name: name of profile (NOT NULL)
745 * @len: length of @name substring to match
746 *
John Johansen01e2b672013-07-10 21:06:43 -0700747 * Requires: rcu_read_lock be held
John Johansenc88d4c72010-07-29 14:48:00 -0700748 *
749 * Returns: unrefcounted profile ptr, or NULL if not found
750 */
751static struct aa_profile *__strn_find_child(struct list_head *head,
752 const char *name, int len)
753{
754 return (struct aa_profile *)__policy_strn_find(head, name, len);
755}
756
757/**
758 * aa_find_child - find a profile by @name in @parent
759 * @parent: profile to search (NOT NULL)
760 * @name: profile name to search for (NOT NULL)
761 *
762 * Returns: a refcounted profile or NULL if not found
763 */
764struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
765{
766 struct aa_profile *profile;
767
John Johansen01e2b672013-07-10 21:06:43 -0700768 rcu_read_lock();
John Johansenc88d4c72010-07-29 14:48:00 -0700769 profile = aa_get_profile(__find_child(&parent->base.profiles, name));
John Johansen01e2b672013-07-10 21:06:43 -0700770 rcu_read_unlock();
John Johansenc88d4c72010-07-29 14:48:00 -0700771
772 /* refcount released by caller */
773 return profile;
774}
775
776/**
777 * __lookup_parent - lookup the parent of a profile of name @hname
778 * @ns: namespace to lookup profile in (NOT NULL)
779 * @hname: hierarchical profile name to find parent of (NOT NULL)
780 *
781 * Lookups up the parent of a fully qualified profile name, the profile
782 * that matches hname does not need to exist, in general this
783 * is used to load a new profile.
784 *
John Johansen01e2b672013-07-10 21:06:43 -0700785 * Requires: rcu_read_lock be held
John Johansenc88d4c72010-07-29 14:48:00 -0700786 *
787 * Returns: unrefcounted policy or NULL if not found
788 */
789static struct aa_policy *__lookup_parent(struct aa_namespace *ns,
790 const char *hname)
791{
792 struct aa_policy *policy;
793 struct aa_profile *profile = NULL;
794 char *split;
795
796 policy = &ns->base;
797
798 for (split = strstr(hname, "//"); split;) {
799 profile = __strn_find_child(&policy->profiles, hname,
800 split - hname);
801 if (!profile)
802 return NULL;
803 policy = &profile->base;
804 hname = split + 2;
805 split = strstr(hname, "//");
806 }
807 if (!profile)
808 return &ns->base;
809 return &profile->base;
810}
811
812/**
813 * __lookup_profile - lookup the profile matching @hname
814 * @base: base list to start looking up profile name from (NOT NULL)
815 * @hname: hierarchical profile name (NOT NULL)
816 *
John Johansen01e2b672013-07-10 21:06:43 -0700817 * Requires: rcu_read_lock be held
John Johansenc88d4c72010-07-29 14:48:00 -0700818 *
819 * Returns: unrefcounted profile pointer or NULL if not found
820 *
821 * Do a relative name lookup, recursing through profile tree.
822 */
823static struct aa_profile *__lookup_profile(struct aa_policy *base,
824 const char *hname)
825{
826 struct aa_profile *profile = NULL;
827 char *split;
828
829 for (split = strstr(hname, "//"); split;) {
830 profile = __strn_find_child(&base->profiles, hname,
831 split - hname);
832 if (!profile)
833 return NULL;
834
835 base = &profile->base;
836 hname = split + 2;
837 split = strstr(hname, "//");
838 }
839
840 profile = __find_child(&base->profiles, hname);
841
842 return profile;
843}
844
845/**
846 * aa_lookup_profile - find a profile by its full or partial name
847 * @ns: the namespace to start from (NOT NULL)
848 * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL)
849 *
850 * Returns: refcounted profile or NULL if not found
851 */
852struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *hname)
853{
854 struct aa_profile *profile;
855
John Johansen01e2b672013-07-10 21:06:43 -0700856 rcu_read_lock();
857 do {
858 profile = __lookup_profile(&ns->base, hname);
859 } while (profile && !aa_get_profile_not0(profile));
860 rcu_read_unlock();
John Johansenc88d4c72010-07-29 14:48:00 -0700861
John Johansenbf832082012-05-16 11:00:05 -0700862 /* the unconfined profile is not in the regular profile list */
863 if (!profile && strcmp(hname, "unconfined") == 0)
John Johansenfa2ac462013-07-10 21:08:43 -0700864 profile = aa_get_newest_profile(ns->unconfined);
John Johansenbf832082012-05-16 11:00:05 -0700865
John Johansenc88d4c72010-07-29 14:48:00 -0700866 /* refcount released by caller */
867 return profile;
868}
869
870/**
871 * replacement_allowed - test to see if replacement is allowed
872 * @profile: profile to test if it can be replaced (MAYBE NULL)
873 * @noreplace: true if replacement shouldn't be allowed but addition is okay
874 * @info: Returns - info about why replacement failed (NOT NULL)
875 *
876 * Returns: %0 if replacement allowed else error code
877 */
878static int replacement_allowed(struct aa_profile *profile, int noreplace,
879 const char **info)
880{
881 if (profile) {
882 if (profile->flags & PFLAG_IMMUTABLE) {
883 *info = "cannot replace immutible profile";
884 return -EPERM;
885 } else if (noreplace) {
886 *info = "profile already exists";
887 return -EEXIST;
888 }
889 }
890 return 0;
891}
892
893/**
John Johansenc88d4c72010-07-29 14:48:00 -0700894 * aa_audit_policy - Do auditing of policy changes
895 * @op: policy operation being performed
896 * @gfp: memory allocation flags
897 * @name: name of profile being manipulated (NOT NULL)
898 * @info: any extra information to be audited (MAYBE NULL)
899 * @error: error code
900 *
901 * Returns: the error to be returned after audit is done
902 */
903static int audit_policy(int op, gfp_t gfp, const char *name, const char *info,
904 int error)
905{
906 struct common_audit_data sa;
Eric Paris3b3b0e42012-04-03 09:37:02 -0700907 struct apparmor_audit_data aad = {0,};
Eric Paris50c205f2012-04-04 15:01:43 -0400908 sa.type = LSM_AUDIT_DATA_NONE;
Eric Paris3b3b0e42012-04-03 09:37:02 -0700909 sa.aad = &aad;
910 aad.op = op;
911 aad.name = name;
912 aad.info = info;
913 aad.error = error;
John Johansenc88d4c72010-07-29 14:48:00 -0700914
915 return aa_audit(AUDIT_APPARMOR_STATUS, __aa_current_profile(), gfp,
916 &sa, NULL);
917}
918
919/**
920 * aa_may_manage_policy - can the current task manage policy
921 * @op: the policy manipulation operation being done
922 *
923 * Returns: true if the task is allowed to manipulate policy
924 */
925bool aa_may_manage_policy(int op)
926{
927 /* check if loading policy is locked out */
928 if (aa_g_lock_policy) {
929 audit_policy(op, GFP_KERNEL, NULL, "policy_locked", -EACCES);
930 return 0;
931 }
932
933 if (!capable(CAP_MAC_ADMIN)) {
934 audit_policy(op, GFP_KERNEL, NULL, "not policy admin", -EACCES);
935 return 0;
936 }
937
938 return 1;
939}
940
John Johansendd51c8482013-07-10 21:05:43 -0700941static struct aa_profile *__list_lookup_parent(struct list_head *lh,
942 struct aa_profile *profile)
943{
944 const char *base = hname_tail(profile->base.hname);
945 long len = base - profile->base.hname;
946 struct aa_load_ent *ent;
947
948 /* parent won't have trailing // so remove from len */
949 if (len <= 2)
950 return NULL;
951 len -= 2;
952
953 list_for_each_entry(ent, lh, list) {
954 if (ent->new == profile)
955 continue;
956 if (strncmp(ent->new->base.hname, profile->base.hname, len) ==
957 0 && ent->new->base.hname[len] == 0)
958 return ent->new;
959 }
960
961 return NULL;
962}
963
964/**
965 * __replace_profile - replace @old with @new on a list
966 * @old: profile to be replaced (NOT NULL)
967 * @new: profile to replace @old with (NOT NULL)
John Johansen77b071b2013-07-10 21:07:43 -0700968 * @share_replacedby: transfer @old->replacedby to @new
John Johansendd51c8482013-07-10 21:05:43 -0700969 *
970 * Will duplicate and refcount elements that @new inherits from @old
971 * and will inherit @old children.
972 *
973 * refcount @new for list, put @old list refcount
974 *
975 * Requires: namespace list lock be held, or list not be shared
976 */
John Johansen77b071b2013-07-10 21:07:43 -0700977static void __replace_profile(struct aa_profile *old, struct aa_profile *new,
978 bool share_replacedby)
John Johansendd51c8482013-07-10 21:05:43 -0700979{
980 struct aa_profile *child, *tmp;
981
982 if (!list_empty(&old->base.profiles)) {
983 LIST_HEAD(lh);
John Johansen01e2b672013-07-10 21:06:43 -0700984 list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu);
John Johansendd51c8482013-07-10 21:05:43 -0700985
986 list_for_each_entry_safe(child, tmp, &lh, base.list) {
987 struct aa_profile *p;
988
989 list_del_init(&child->base.list);
990 p = __find_child(&new->base.profiles, child->base.name);
991 if (p) {
992 /* @p replaces @child */
John Johansen77b071b2013-07-10 21:07:43 -0700993 __replace_profile(child, p, share_replacedby);
John Johansendd51c8482013-07-10 21:05:43 -0700994 continue;
995 }
996
997 /* inherit @child and its children */
998 /* TODO: update hname of inherited children */
999 /* list refcount transferred to @new */
John Johansen0d259f02013-07-10 21:13:43 -07001000 p = aa_deref_parent(child);
John Johansen01e2b672013-07-10 21:06:43 -07001001 rcu_assign_pointer(child->parent, aa_get_profile(new));
1002 list_add_rcu(&child->base.list, &new->base.profiles);
1003 aa_put_profile(p);
John Johansendd51c8482013-07-10 21:05:43 -07001004 }
1005 }
1006
John Johansen01e2b672013-07-10 21:06:43 -07001007 if (!rcu_access_pointer(new->parent)) {
John Johansen0d259f02013-07-10 21:13:43 -07001008 struct aa_profile *parent = aa_deref_parent(old);
John Johansen01e2b672013-07-10 21:06:43 -07001009 rcu_assign_pointer(new->parent, aa_get_profile(parent));
1010 }
John Johansen77b071b2013-07-10 21:07:43 -07001011 __aa_update_replacedby(old, new);
1012 if (share_replacedby) {
1013 aa_put_replacedby(new->replacedby);
1014 new->replacedby = aa_get_replacedby(old->replacedby);
John Johansen0d259f02013-07-10 21:13:43 -07001015 } else if (!rcu_access_pointer(new->replacedby->profile))
1016 /* aafs interface uses replacedby */
1017 rcu_assign_pointer(new->replacedby->profile,
1018 aa_get_profile(new));
1019 __aa_fs_profile_migrate_dents(old, new);
John Johansendd51c8482013-07-10 21:05:43 -07001020
1021 if (list_empty(&new->base.list)) {
1022 /* new is not on a list already */
John Johansen01e2b672013-07-10 21:06:43 -07001023 list_replace_rcu(&old->base.list, &new->base.list);
John Johansendd51c8482013-07-10 21:05:43 -07001024 aa_get_profile(new);
1025 aa_put_profile(old);
1026 } else
1027 __list_remove_profile(old);
1028}
1029
1030/**
1031 * __lookup_replace - lookup replacement information for a profile
1032 * @ns - namespace the lookup occurs in
1033 * @hname - name of profile to lookup
1034 * @noreplace - true if not replacing an existing profile
1035 * @p - Returns: profile to be replaced
1036 * @info - Returns: info string on why lookup failed
1037 *
1038 * Returns: profile to replace (no ref) on success else ptr error
1039 */
1040static int __lookup_replace(struct aa_namespace *ns, const char *hname,
1041 bool noreplace, struct aa_profile **p,
1042 const char **info)
1043{
1044 *p = aa_get_profile(__lookup_profile(&ns->base, hname));
1045 if (*p) {
1046 int error = replacement_allowed(*p, noreplace, info);
1047 if (error) {
1048 *info = "profile can not be replaced";
1049 return error;
1050 }
1051 }
1052
1053 return 0;
1054}
1055
John Johansenc88d4c72010-07-29 14:48:00 -07001056/**
1057 * aa_replace_profiles - replace profile(s) on the profile list
1058 * @udata: serialized data stream (NOT NULL)
1059 * @size: size of the serialized data stream
1060 * @noreplace: true if only doing addition, no replacement allowed
1061 *
1062 * unpack and replace a profile on the profile list and uses of that profile
1063 * by any aa_task_cxt. If the profile does not exist on the profile list
1064 * it is added.
1065 *
1066 * Returns: size of data consumed else error code on failure.
1067 */
1068ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
1069{
John Johansenc88d4c72010-07-29 14:48:00 -07001070 const char *ns_name, *name = NULL, *info = NULL;
John Johansendd51c8482013-07-10 21:05:43 -07001071 struct aa_namespace *ns = NULL;
1072 struct aa_load_ent *ent, *tmp;
John Johansenc88d4c72010-07-29 14:48:00 -07001073 int op = OP_PROF_REPL;
1074 ssize_t error;
John Johansendd51c8482013-07-10 21:05:43 -07001075 LIST_HEAD(lh);
John Johansenc88d4c72010-07-29 14:48:00 -07001076
1077 /* released below */
John Johansendd51c8482013-07-10 21:05:43 -07001078 error = aa_unpack(udata, size, &lh, &ns_name);
1079 if (error)
1080 goto out;
John Johansenc88d4c72010-07-29 14:48:00 -07001081
1082 /* released below */
1083 ns = aa_prepare_namespace(ns_name);
1084 if (!ns) {
1085 info = "failed to prepare namespace";
1086 error = -ENOMEM;
1087 name = ns_name;
1088 goto fail;
1089 }
1090
John Johansen01e2b672013-07-10 21:06:43 -07001091 mutex_lock(&ns->lock);
John Johansendd51c8482013-07-10 21:05:43 -07001092 /* setup parent and ns info */
1093 list_for_each_entry(ent, &lh, list) {
1094 struct aa_policy *policy;
John Johansenc88d4c72010-07-29 14:48:00 -07001095
John Johansendd51c8482013-07-10 21:05:43 -07001096 name = ent->new->base.hname;
1097 error = __lookup_replace(ns, ent->new->base.hname, noreplace,
1098 &ent->old, &info);
1099 if (error)
1100 goto fail_lock;
John Johansenc88d4c72010-07-29 14:48:00 -07001101
John Johansendd51c8482013-07-10 21:05:43 -07001102 if (ent->new->rename) {
1103 error = __lookup_replace(ns, ent->new->rename,
1104 noreplace, &ent->rename,
1105 &info);
1106 if (error)
1107 goto fail_lock;
John Johansenc88d4c72010-07-29 14:48:00 -07001108 }
John Johansendd51c8482013-07-10 21:05:43 -07001109
1110 /* released when @new is freed */
1111 ent->new->ns = aa_get_namespace(ns);
1112
1113 if (ent->old || ent->rename)
1114 continue;
1115
1116 /* no ref on policy only use inside lock */
1117 policy = __lookup_parent(ns, ent->new->base.hname);
1118 if (!policy) {
1119 struct aa_profile *p;
1120 p = __list_lookup_parent(&lh, ent->new);
1121 if (!p) {
1122 error = -ENOENT;
1123 info = "parent does not exist";
1124 name = ent->new->base.hname;
1125 goto fail_lock;
1126 }
John Johansen01e2b672013-07-10 21:06:43 -07001127 rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
1128 } else if (policy != &ns->base) {
John Johansendd51c8482013-07-10 21:05:43 -07001129 /* released on profile replacement or free_profile */
John Johansen01e2b672013-07-10 21:06:43 -07001130 struct aa_profile *p = (struct aa_profile *) policy;
1131 rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
1132 }
John Johansenc88d4c72010-07-29 14:48:00 -07001133 }
1134
John Johansen0d259f02013-07-10 21:13:43 -07001135 /* create new fs entries for introspection if needed */
1136 list_for_each_entry(ent, &lh, list) {
1137 if (ent->old) {
1138 /* inherit old interface files */
1139
1140 /* if (ent->rename)
1141 TODO: support rename */
1142 /* } else if (ent->rename) {
1143 TODO: support rename */
1144 } else {
1145 struct dentry *parent;
1146 if (rcu_access_pointer(ent->new->parent)) {
1147 struct aa_profile *p;
1148 p = aa_deref_parent(ent->new);
1149 parent = prof_child_dir(p);
1150 } else
1151 parent = ns_subprofs_dir(ent->new->ns);
1152 error = __aa_fs_profile_mkdir(ent->new, parent);
1153 }
1154
1155 if (error) {
1156 info = "failed to create ";
1157 goto fail_lock;
1158 }
1159 }
1160
1161 /* Done with checks that may fail - do actual replacement */
John Johansendd51c8482013-07-10 21:05:43 -07001162 list_for_each_entry_safe(ent, tmp, &lh, list) {
1163 list_del_init(&ent->list);
1164 op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL;
John Johansenc88d4c72010-07-29 14:48:00 -07001165
John Johansendd51c8482013-07-10 21:05:43 -07001166 audit_policy(op, GFP_ATOMIC, ent->new->base.name, NULL, error);
John Johansenc88d4c72010-07-29 14:48:00 -07001167
John Johansendd51c8482013-07-10 21:05:43 -07001168 if (ent->old) {
John Johansen77b071b2013-07-10 21:07:43 -07001169 __replace_profile(ent->old, ent->new, 1);
John Johansen0d259f02013-07-10 21:13:43 -07001170 if (ent->rename) {
1171 /* aafs interface uses replacedby */
1172 struct aa_replacedby *r = ent->new->replacedby;
1173 rcu_assign_pointer(r->profile,
1174 aa_get_profile(ent->new));
John Johansen77b071b2013-07-10 21:07:43 -07001175 __replace_profile(ent->rename, ent->new, 0);
John Johansen0d259f02013-07-10 21:13:43 -07001176 }
John Johansendd51c8482013-07-10 21:05:43 -07001177 } else if (ent->rename) {
John Johansen0d259f02013-07-10 21:13:43 -07001178 /* aafs interface uses replacedby */
1179 rcu_assign_pointer(ent->new->replacedby->profile,
1180 aa_get_profile(ent->new));
John Johansen77b071b2013-07-10 21:07:43 -07001181 __replace_profile(ent->rename, ent->new, 0);
John Johansendd51c8482013-07-10 21:05:43 -07001182 } else if (ent->new->parent) {
John Johansen01e2b672013-07-10 21:06:43 -07001183 struct aa_profile *parent, *newest;
John Johansen0d259f02013-07-10 21:13:43 -07001184 parent = aa_deref_parent(ent->new);
John Johansen77b071b2013-07-10 21:07:43 -07001185 newest = aa_get_newest_profile(parent);
John Johansen01e2b672013-07-10 21:06:43 -07001186
John Johansendd51c8482013-07-10 21:05:43 -07001187 /* parent replaced in this atomic set? */
John Johansen01e2b672013-07-10 21:06:43 -07001188 if (newest != parent) {
1189 aa_get_profile(newest);
1190 aa_put_profile(parent);
1191 rcu_assign_pointer(ent->new->parent, newest);
John Johansen77b071b2013-07-10 21:07:43 -07001192 } else
1193 aa_put_profile(newest);
John Johansen0d259f02013-07-10 21:13:43 -07001194 /* aafs interface uses replacedby */
1195 rcu_assign_pointer(ent->new->replacedby->profile,
1196 aa_get_profile(ent->new));
John Johansendd51c8482013-07-10 21:05:43 -07001197 __list_add_profile(&parent->base.profiles, ent->new);
John Johansen0d259f02013-07-10 21:13:43 -07001198 } else {
1199 /* aafs interface uses replacedby */
1200 rcu_assign_pointer(ent->new->replacedby->profile,
1201 aa_get_profile(ent->new));
John Johansendd51c8482013-07-10 21:05:43 -07001202 __list_add_profile(&ns->base.profiles, ent->new);
John Johansen0d259f02013-07-10 21:13:43 -07001203 }
John Johansendd51c8482013-07-10 21:05:43 -07001204 aa_load_ent_free(ent);
John Johansenc88d4c72010-07-29 14:48:00 -07001205 }
John Johansen01e2b672013-07-10 21:06:43 -07001206 mutex_unlock(&ns->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001207
1208out:
1209 aa_put_namespace(ns);
John Johansendd51c8482013-07-10 21:05:43 -07001210
John Johansenc88d4c72010-07-29 14:48:00 -07001211 if (error)
1212 return error;
1213 return size;
1214
John Johansendd51c8482013-07-10 21:05:43 -07001215fail_lock:
John Johansen01e2b672013-07-10 21:06:43 -07001216 mutex_unlock(&ns->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001217fail:
1218 error = audit_policy(op, GFP_KERNEL, name, info, error);
John Johansendd51c8482013-07-10 21:05:43 -07001219
1220 list_for_each_entry_safe(ent, tmp, &lh, list) {
1221 list_del_init(&ent->list);
1222 aa_load_ent_free(ent);
1223 }
1224
John Johansenc88d4c72010-07-29 14:48:00 -07001225 goto out;
1226}
1227
1228/**
1229 * aa_remove_profiles - remove profile(s) from the system
1230 * @fqname: name of the profile or namespace to remove (NOT NULL)
1231 * @size: size of the name
1232 *
1233 * Remove a profile or sub namespace from the current namespace, so that
1234 * they can not be found anymore and mark them as replaced by unconfined
1235 *
1236 * NOTE: removing confinement does not restore rlimits to preconfinemnet values
1237 *
1238 * Returns: size of data consume else error code if fails
1239 */
1240ssize_t aa_remove_profiles(char *fqname, size_t size)
1241{
1242 struct aa_namespace *root, *ns = NULL;
1243 struct aa_profile *profile = NULL;
1244 const char *name = fqname, *info = NULL;
1245 ssize_t error = 0;
1246
1247 if (*fqname == 0) {
1248 info = "no profile specified";
1249 error = -ENOENT;
1250 goto fail;
1251 }
1252
1253 root = aa_current_profile()->ns;
1254
1255 if (fqname[0] == ':') {
1256 char *ns_name;
1257 name = aa_split_fqname(fqname, &ns_name);
John Johansen41d1b3e2013-02-21 01:14:17 -08001258 /* released below */
1259 ns = aa_find_namespace(root, ns_name);
1260 if (!ns) {
1261 info = "namespace does not exist";
1262 error = -ENOENT;
1263 goto fail;
John Johansenc88d4c72010-07-29 14:48:00 -07001264 }
1265 } else
1266 /* released below */
1267 ns = aa_get_namespace(root);
1268
John Johansenc88d4c72010-07-29 14:48:00 -07001269 if (!name) {
1270 /* remove namespace - can only happen if fqname[0] == ':' */
John Johansen01e2b672013-07-10 21:06:43 -07001271 mutex_lock(&ns->parent->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001272 __remove_namespace(ns);
John Johansen01e2b672013-07-10 21:06:43 -07001273 mutex_unlock(&ns->parent->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001274 } else {
1275 /* remove profile */
John Johansen01e2b672013-07-10 21:06:43 -07001276 mutex_lock(&ns->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001277 profile = aa_get_profile(__lookup_profile(&ns->base, name));
1278 if (!profile) {
1279 error = -ENOENT;
1280 info = "profile does not exist";
1281 goto fail_ns_lock;
1282 }
1283 name = profile->base.hname;
1284 __remove_profile(profile);
John Johansen01e2b672013-07-10 21:06:43 -07001285 mutex_unlock(&ns->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001286 }
John Johansenc88d4c72010-07-29 14:48:00 -07001287
1288 /* don't fail removal if audit fails */
1289 (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error);
1290 aa_put_namespace(ns);
1291 aa_put_profile(profile);
1292 return size;
1293
1294fail_ns_lock:
John Johansen01e2b672013-07-10 21:06:43 -07001295 mutex_unlock(&ns->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001296 aa_put_namespace(ns);
1297
1298fail:
1299 (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error);
1300 return error;
1301}