2 * AppArmor security module
4 * This file contains AppArmor policy manipulation functions
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
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
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.
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.
24 * Namespace and profile names can be written together in either
26 * :namespace:profile - used by kernel interfaces for easy detection
27 * namespace://profile - used by policy
29 * Profile names can not start with : or @ or ^ and may not contain \0
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
36 * Namespace names may not start with / or @ and may not contain \0 or :
37 * Reserved namespace names
38 * user-XXXX - user defined profiles
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.
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
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
67 * An fqname is a name that may contain both namespace and profile hnames.
68 * eg. :ns:/bin/bash//bin/ls
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
76 #include <linux/slab.h>
77 #include <linux/spinlock.h>
78 #include <linux/string.h>
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"
90 #include "include/sid.h"
93 /* root profile namespace */
94 struct aa_namespace *root_ns;
96 const char *const profile_mode_names[] = {
103 * hname_tail - find the last component of an hname
104 * @name: hname to find the base profile name component of (NOT NULL)
106 * Returns: the tail (base profile name) name component of an hname
108 static const char *hname_tail(const char *hname)
111 hname = strim((char *)hname);
112 for (split = strstr(hname, "//"); split; split = strstr(hname, "//"))
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)
124 * Note: this fn creates a copy of strings passed in
126 * Returns: true if policy init successful
128 static bool policy_init(struct aa_policy *policy, const char *prefix,
131 /* freed by policy_free */
133 policy->hname = kmalloc(strlen(prefix) + strlen(name) + 3,
136 sprintf(policy->hname, "%s//%s", prefix, name);
138 policy->hname = kstrdup(name, GFP_KERNEL);
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);
145 kref_init(&policy->count);
151 * policy_destroy - free the elements referenced by @policy
152 * @policy: policy that is to have its elements freed (NOT NULL)
154 static void policy_destroy(struct aa_policy *policy)
156 /* still contains profiles -- invalid */
157 if (!list_empty(&policy->profiles)) {
158 AA_ERROR("%s: internal error, "
159 "policy '%s' still contains profiles\n",
160 __func__, policy->name);
163 if (!list_empty(&policy->list)) {
164 AA_ERROR("%s: internal error, policy '%s' still on list\n",
165 __func__, policy->name);
169 /* don't free name as its a subset of hname */
170 kzfree(policy->hname);
174 * __policy_find - find a policy by @name on a policy list
175 * @head: list to search (NOT NULL)
176 * @name: name to search for (NOT NULL)
178 * Requires: correct locks for the @head list be held
180 * Returns: unrefcounted policy that match @name or NULL if not found
182 static struct aa_policy *__policy_find(struct list_head *head, const char *name)
184 struct aa_policy *policy;
186 list_for_each_entry(policy, head, list) {
187 if (!strcmp(policy->name, name))
194 * __policy_strn_find - find a policy that's name matches @len chars of @str
195 * @head: list to search (NOT NULL)
196 * @str: string to search for (NOT NULL)
197 * @len: length of match required
199 * Requires: correct locks for the @head list be held
201 * Returns: unrefcounted policy that match @str or NULL if not found
203 * if @len == strlen(@strlen) then this is equiv to __policy_find
204 * other wise it allows searching for policy by a partial match of name
206 static struct aa_policy *__policy_strn_find(struct list_head *head,
207 const char *str, int len)
209 struct aa_policy *policy;
211 list_for_each_entry(policy, head, list) {
212 if (aa_strneq(policy->name, str, len))
220 * Routines for AppArmor namespaces
223 static const char *hidden_ns_name = "---";
225 * aa_ns_visible - test if @view is visible from @curr
226 * @curr: namespace to treat as the parent (NOT NULL)
227 * @view: namespace to test if visible from @curr (NOT NULL)
229 * Returns: true if @view is visible from @curr else false
231 bool aa_ns_visible(struct aa_namespace *curr, struct aa_namespace *view)
236 for ( ; view; view = view->parent) {
237 if (view->parent == curr)
244 * aa_na_name - Find the ns name to display for @view from @curr
245 * @curr - current namespace (NOT NULL)
246 * @view - namespace attempting to view (NOT NULL)
248 * Returns: name of @view visible from @curr
250 const char *aa_ns_name(struct aa_namespace *curr, struct aa_namespace *view)
252 /* if view == curr then the namespace name isn't displayed */
256 if (aa_ns_visible(curr, view)) {
257 /* at this point if a ns is visible it is in a view ns
258 * thus the curr ns.hname is a prefix of its name.
259 * Only output the virtualized portion of the name
260 * Add + 2 to skip over // separating curr hname prefix
261 * from the visible tail of the views hname
263 return view->base.hname + strlen(curr->base.hname) + 2;
265 return hidden_ns_name;
269 * alloc_namespace - allocate, initialize and return a new namespace
270 * @prefix: parent namespace name (MAYBE NULL)
271 * @name: a preallocated name (NOT NULL)
273 * Returns: refcounted namespace or NULL on failure.
275 static struct aa_namespace *alloc_namespace(const char *prefix,
278 struct aa_namespace *ns;
280 ns = kzalloc(sizeof(*ns), GFP_KERNEL);
281 AA_DEBUG("%s(%p)\n", __func__, ns);
284 if (!policy_init(&ns->base, prefix, name))
287 INIT_LIST_HEAD(&ns->sub_ns);
288 rwlock_init(&ns->lock);
290 /* released by free_namespace */
291 ns->unconfined = aa_alloc_profile("unconfined");
293 goto fail_unconfined;
295 ns->unconfined->sid = aa_alloc_sid();
296 ns->unconfined->flags = PFLAG_UNCONFINED | PFLAG_IX_ON_NAME_ERROR |
300 * released by free_namespace, however __remove_namespace breaks
301 * the cyclic references (ns->unconfined, and unconfined->ns) and
302 * replaces with refs to parent namespace unconfined
304 ns->unconfined->ns = aa_get_namespace(ns);
309 kzfree(ns->base.hname);
316 * free_namespace - free a profile namespace
317 * @ns: the namespace to free (MAYBE NULL)
319 * Requires: All references to the namespace must have been put, if the
320 * namespace was referenced by a profile confining a task,
322 static void free_namespace(struct aa_namespace *ns)
327 policy_destroy(&ns->base);
328 aa_put_namespace(ns->parent);
330 if (ns->unconfined && ns->unconfined->ns == ns)
331 ns->unconfined->ns = NULL;
333 aa_put_profile(ns->unconfined);
338 * aa_free_namespace_kref - free aa_namespace by kref (see aa_put_namespace)
339 * @kr: kref callback for freeing of a namespace (NOT NULL)
341 void aa_free_namespace_kref(struct kref *kref)
343 free_namespace(container_of(kref, struct aa_namespace, base.count));
347 * __aa_find_namespace - find a namespace on a list by @name
348 * @head: list to search for namespace on (NOT NULL)
349 * @name: name of namespace to look for (NOT NULL)
351 * Returns: unrefcounted namespace
353 * Requires: ns lock be held
355 static struct aa_namespace *__aa_find_namespace(struct list_head *head,
358 return (struct aa_namespace *)__policy_find(head, name);
362 * aa_find_namespace - look up a profile namespace on the namespace list
363 * @root: namespace to search in (NOT NULL)
364 * @name: name of namespace to find (NOT NULL)
366 * Returns: a refcounted namespace on the list, or NULL if no namespace
367 * called @name exists.
369 * refcount released by caller
371 struct aa_namespace *aa_find_namespace(struct aa_namespace *root,
374 struct aa_namespace *ns = NULL;
376 read_lock(&root->lock);
377 ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name));
378 read_unlock(&root->lock);
384 * aa_prepare_namespace - find an existing or create a new namespace of @name
385 * @name: the namespace to find or add (MAYBE NULL)
387 * Returns: refcounted namespace or NULL if failed to create one
389 static struct aa_namespace *aa_prepare_namespace(const char *name)
391 struct aa_namespace *ns, *root;
393 root = aa_current_profile()->ns;
395 write_lock(&root->lock);
397 /* if name isn't specified the profile is loaded to the current ns */
399 /* released by caller */
400 ns = aa_get_namespace(root);
404 /* try and find the specified ns and if it doesn't exist create it */
405 /* released by caller */
406 ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name));
408 /* namespace not found */
409 struct aa_namespace *new_ns;
410 write_unlock(&root->lock);
411 new_ns = alloc_namespace(root->base.hname, name);
414 write_lock(&root->lock);
415 /* test for race when new_ns was allocated */
416 ns = __aa_find_namespace(&root->sub_ns, name);
419 new_ns->parent = aa_get_namespace(root);
421 list_add(&new_ns->base.list, &root->sub_ns);
423 ns = aa_get_namespace(new_ns);
425 /* raced so free the new one */
426 free_namespace(new_ns);
427 /* get reference on namespace */
428 aa_get_namespace(ns);
432 write_unlock(&root->lock);
439 * __list_add_profile - add a profile to a list
440 * @list: list to add it to (NOT NULL)
441 * @profile: the profile to add (NOT NULL)
443 * refcount @profile, should be put by __list_remove_profile
445 * Requires: namespace lock be held, or list not be shared
447 static void __list_add_profile(struct list_head *list,
448 struct aa_profile *profile)
450 list_add(&profile->base.list, list);
451 /* get list reference */
452 aa_get_profile(profile);
456 * __list_remove_profile - remove a profile from the list it is on
457 * @profile: the profile to remove (NOT NULL)
459 * remove a profile from the list, warning generally removal should
460 * be done with __replace_profile as most profile removals are
461 * replacements to the unconfined profile.
463 * put @profile list refcount
465 * Requires: namespace lock be held, or list not have been live
467 static void __list_remove_profile(struct aa_profile *profile)
469 list_del_init(&profile->base.list);
470 if (!(profile->flags & PFLAG_NO_LIST_REF))
471 /* release list reference */
472 aa_put_profile(profile);
476 * __replace_profile - replace @old with @new on a list
477 * @old: profile to be replaced (NOT NULL)
478 * @new: profile to replace @old with (NOT NULL)
480 * Will duplicate and refcount elements that @new inherits from @old
481 * and will inherit @old children.
483 * refcount @new for list, put @old list refcount
485 * Requires: namespace list lock be held, or list not be shared
487 static void __replace_profile(struct aa_profile *old, struct aa_profile *new)
489 struct aa_policy *policy;
490 struct aa_profile *child, *tmp;
493 policy = &old->parent->base;
495 policy = &old->ns->base;
497 /* released when @new is freed */
498 new->parent = aa_get_profile(old->parent);
499 new->ns = aa_get_namespace(old->ns);
501 __list_add_profile(&policy->profiles, new);
502 /* inherit children */
503 list_for_each_entry_safe(child, tmp, &old->base.profiles, base.list) {
504 aa_put_profile(child->parent);
505 child->parent = aa_get_profile(new);
506 /* list refcount transferred to @new*/
507 list_move(&child->base.list, &new->base.profiles);
510 /* released by free_profile */
511 old->replacedby = aa_get_profile(new);
512 __list_remove_profile(old);
515 static void __profile_list_release(struct list_head *head);
518 * __remove_profile - remove old profile, and children
519 * @profile: profile to be replaced (NOT NULL)
521 * Requires: namespace list lock be held, or list not be shared
523 static void __remove_profile(struct aa_profile *profile)
525 /* release any children lists first */
526 __profile_list_release(&profile->base.profiles);
527 /* released by free_profile */
528 profile->replacedby = aa_get_profile(profile->ns->unconfined);
529 __list_remove_profile(profile);
533 * __profile_list_release - remove all profiles on the list and put refs
534 * @head: list of profiles (NOT NULL)
536 * Requires: namespace lock be held
538 static void __profile_list_release(struct list_head *head)
540 struct aa_profile *profile, *tmp;
541 list_for_each_entry_safe(profile, tmp, head, base.list)
542 __remove_profile(profile);
545 static void __ns_list_release(struct list_head *head);
548 * destroy_namespace - remove everything contained by @ns
549 * @ns: namespace to have it contents removed (NOT NULL)
551 static void destroy_namespace(struct aa_namespace *ns)
556 write_lock(&ns->lock);
557 /* release all profiles in this namespace */
558 __profile_list_release(&ns->base.profiles);
560 /* release all sub namespaces */
561 __ns_list_release(&ns->sub_ns);
563 write_unlock(&ns->lock);
567 * __remove_namespace - remove a namespace and all its children
568 * @ns: namespace to be removed (NOT NULL)
570 * Requires: ns->parent->lock be held and ns removed from parent.
572 static void __remove_namespace(struct aa_namespace *ns)
574 struct aa_profile *unconfined = ns->unconfined;
576 /* remove ns from namespace list */
577 list_del_init(&ns->base.list);
580 * break the ns, unconfined profile cyclic reference and forward
581 * all new unconfined profiles requests to the parent namespace
582 * This will result in all confined tasks that have a profile
583 * being removed, inheriting the parent->unconfined profile.
586 ns->unconfined = aa_get_profile(ns->parent->unconfined);
588 destroy_namespace(ns);
590 /* release original ns->unconfined ref */
591 aa_put_profile(unconfined);
592 /* release ns->base.list ref, from removal above */
593 aa_put_namespace(ns);
597 * __ns_list_release - remove all profile namespaces on the list put refs
598 * @head: list of profile namespaces (NOT NULL)
600 * Requires: namespace lock be held
602 static void __ns_list_release(struct list_head *head)
604 struct aa_namespace *ns, *tmp;
605 list_for_each_entry_safe(ns, tmp, head, base.list)
606 __remove_namespace(ns);
611 * aa_alloc_root_ns - allocate the root profile namespace
613 * Returns: %0 on success else error
616 int __init aa_alloc_root_ns(void)
618 /* released by aa_free_root_ns - used as list ref*/
619 root_ns = alloc_namespace(NULL, "root");
627 * aa_free_root_ns - free the root profile namespace
629 void __init aa_free_root_ns(void)
631 struct aa_namespace *ns = root_ns;
634 destroy_namespace(ns);
635 aa_put_namespace(ns);
639 * aa_alloc_profile - allocate, initialize and return a new profile
640 * @hname: name of the profile (NOT NULL)
642 * Returns: refcount profile or NULL on failure
644 struct aa_profile *aa_alloc_profile(const char *hname)
646 struct aa_profile *profile;
648 /* freed by free_profile - usually through aa_put_profile */
649 profile = kzalloc(sizeof(*profile), GFP_KERNEL);
653 if (!policy_init(&profile->base, NULL, hname)) {
658 /* refcount released by caller */
663 * aa_new_null_profile - create a new null-X learning profile
664 * @parent: profile that caused this profile to be created (NOT NULL)
665 * @hat: true if the null- learning profile is a hat
667 * Create a null- complain mode profile used in learning mode. The name of
668 * the profile is unique and follows the format of parent//null-sid.
670 * null profiles are added to the profile list but the list does not
671 * hold a count on them so that they are automatically released when
674 * Returns: new refcounted profile else NULL on failure
676 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat)
678 struct aa_profile *profile = NULL;
680 u32 sid = aa_alloc_sid();
683 name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, GFP_KERNEL);
686 sprintf(name, "%s//null-%x", parent->base.hname, sid);
688 profile = aa_alloc_profile(name);
694 profile->mode = APPARMOR_COMPLAIN;
695 profile->flags = PFLAG_NULL;
697 profile->flags |= PFLAG_HAT;
699 /* released on free_profile */
700 profile->parent = aa_get_profile(parent);
701 profile->ns = aa_get_namespace(parent->ns);
703 write_lock(&profile->ns->lock);
704 __list_add_profile(&parent->base.profiles, profile);
705 write_unlock(&profile->ns->lock);
707 /* refcount released by caller */
716 * free_profile - free a profile
717 * @profile: the profile to free (MAYBE NULL)
719 * Free a profile, its hats and null_profile. All references to the profile,
720 * its hats and null_profile must have been put.
722 * If the profile was referenced from a task context, free_profile() will
723 * be called from an rcu callback routine, so we must not sleep here.
725 static void free_profile(struct aa_profile *profile)
727 AA_DEBUG("%s(%p)\n", __func__, profile);
732 if (!list_empty(&profile->base.list)) {
733 AA_ERROR("%s: internal error, "
734 "profile '%s' still on ns list\n",
735 __func__, profile->base.name);
739 /* free children profiles */
740 policy_destroy(&profile->base);
741 aa_put_profile(profile->parent);
743 aa_put_namespace(profile->ns);
744 kzfree(profile->rename);
746 aa_free_file_rules(&profile->file);
747 aa_free_cap_rules(&profile->caps);
748 aa_free_rlimit_rules(&profile->rlimits);
750 aa_free_sid(profile->sid);
751 aa_put_dfa(profile->xmatch);
752 aa_put_dfa(profile->policy.dfa);
754 aa_put_profile(profile->replacedby);
760 * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile)
761 * @kr: kref callback for freeing of a profile (NOT NULL)
763 void aa_free_profile_kref(struct kref *kref)
765 struct aa_profile *p = container_of(kref, struct aa_profile,
771 /* TODO: profile accounting - setup in remove */
774 * __find_child - find a profile on @head list with a name matching @name
775 * @head: list to search (NOT NULL)
776 * @name: name of profile (NOT NULL)
778 * Requires: ns lock protecting list be held
780 * Returns: unrefcounted profile ptr, or NULL if not found
782 static struct aa_profile *__find_child(struct list_head *head, const char *name)
784 return (struct aa_profile *)__policy_find(head, name);
788 * __strn_find_child - find a profile on @head list using substring of @name
789 * @head: list to search (NOT NULL)
790 * @name: name of profile (NOT NULL)
791 * @len: length of @name substring to match
793 * Requires: ns lock protecting list be held
795 * Returns: unrefcounted profile ptr, or NULL if not found
797 static struct aa_profile *__strn_find_child(struct list_head *head,
798 const char *name, int len)
800 return (struct aa_profile *)__policy_strn_find(head, name, len);
804 * aa_find_child - find a profile by @name in @parent
805 * @parent: profile to search (NOT NULL)
806 * @name: profile name to search for (NOT NULL)
808 * Returns: a refcounted profile or NULL if not found
810 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
812 struct aa_profile *profile;
814 read_lock(&parent->ns->lock);
815 profile = aa_get_profile(__find_child(&parent->base.profiles, name));
816 read_unlock(&parent->ns->lock);
818 /* refcount released by caller */
823 * __lookup_parent - lookup the parent of a profile of name @hname
824 * @ns: namespace to lookup profile in (NOT NULL)
825 * @hname: hierarchical profile name to find parent of (NOT NULL)
827 * Lookups up the parent of a fully qualified profile name, the profile
828 * that matches hname does not need to exist, in general this
829 * is used to load a new profile.
831 * Requires: ns->lock be held
833 * Returns: unrefcounted policy or NULL if not found
835 static struct aa_policy *__lookup_parent(struct aa_namespace *ns,
838 struct aa_policy *policy;
839 struct aa_profile *profile = NULL;
844 for (split = strstr(hname, "//"); split;) {
845 profile = __strn_find_child(&policy->profiles, hname,
849 policy = &profile->base;
851 split = strstr(hname, "//");
855 return &profile->base;
859 * __lookup_profile - lookup the profile matching @hname
860 * @base: base list to start looking up profile name from (NOT NULL)
861 * @hname: hierarchical profile name (NOT NULL)
863 * Requires: ns->lock be held
865 * Returns: unrefcounted profile pointer or NULL if not found
867 * Do a relative name lookup, recursing through profile tree.
869 static struct aa_profile *__lookup_profile(struct aa_policy *base,
872 struct aa_profile *profile = NULL;
875 for (split = strstr(hname, "//"); split;) {
876 profile = __strn_find_child(&base->profiles, hname,
881 base = &profile->base;
883 split = strstr(hname, "//");
886 profile = __find_child(&base->profiles, hname);
892 * aa_lookup_profile - find a profile by its full or partial name
893 * @ns: the namespace to start from (NOT NULL)
894 * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL)
896 * Returns: refcounted profile or NULL if not found
898 struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *hname)
900 struct aa_profile *profile;
902 read_lock(&ns->lock);
903 profile = aa_get_profile(__lookup_profile(&ns->base, hname));
904 read_unlock(&ns->lock);
906 /* the unconfined profile is not in the regular profile list */
907 if (!profile && strcmp(hname, "unconfined") == 0)
908 profile = aa_get_profile(ns->unconfined);
910 /* refcount released by caller */
915 * replacement_allowed - test to see if replacement is allowed
916 * @profile: profile to test if it can be replaced (MAYBE NULL)
917 * @noreplace: true if replacement shouldn't be allowed but addition is okay
918 * @info: Returns - info about why replacement failed (NOT NULL)
920 * Returns: %0 if replacement allowed else error code
922 static int replacement_allowed(struct aa_profile *profile, int noreplace,
926 if (profile->flags & PFLAG_IMMUTABLE) {
927 *info = "cannot replace immutible profile";
929 } else if (noreplace) {
930 *info = "profile already exists";
938 * __add_new_profile - simple wrapper around __list_add_profile
939 * @ns: namespace that profile is being added to (NOT NULL)
940 * @policy: the policy container to add the profile to (NOT NULL)
941 * @profile: profile to add (NOT NULL)
943 * add a profile to a list and do other required basic allocations
945 static void __add_new_profile(struct aa_namespace *ns, struct aa_policy *policy,
946 struct aa_profile *profile)
948 if (policy != &ns->base)
949 /* released on profile replacement or free_profile */
950 profile->parent = aa_get_profile((struct aa_profile *) policy);
951 __list_add_profile(&policy->profiles, profile);
952 /* released on free_profile */
953 profile->sid = aa_alloc_sid();
954 profile->ns = aa_get_namespace(ns);
958 * aa_audit_policy - Do auditing of policy changes
959 * @op: policy operation being performed
960 * @gfp: memory allocation flags
961 * @name: name of profile being manipulated (NOT NULL)
962 * @info: any extra information to be audited (MAYBE NULL)
965 * Returns: the error to be returned after audit is done
967 static int audit_policy(int op, gfp_t gfp, const char *name, const char *info,
970 struct common_audit_data sa;
971 struct apparmor_audit_data aad = {0,};
972 sa.type = LSM_AUDIT_DATA_NONE;
979 return aa_audit(AUDIT_APPARMOR_STATUS, __aa_current_profile(), gfp,
984 * aa_may_manage_policy - can the current task manage policy
985 * @op: the policy manipulation operation being done
987 * Returns: true if the task is allowed to manipulate policy
989 bool aa_may_manage_policy(int op)
991 /* check if loading policy is locked out */
992 if (aa_g_lock_policy) {
993 audit_policy(op, GFP_KERNEL, NULL, "policy_locked", -EACCES);
997 if (!capable(CAP_MAC_ADMIN)) {
998 audit_policy(op, GFP_KERNEL, NULL, "not policy admin", -EACCES);
1006 * aa_replace_profiles - replace profile(s) on the profile list
1007 * @udata: serialized data stream (NOT NULL)
1008 * @size: size of the serialized data stream
1009 * @noreplace: true if only doing addition, no replacement allowed
1011 * unpack and replace a profile on the profile list and uses of that profile
1012 * by any aa_task_cxt. If the profile does not exist on the profile list
1015 * Returns: size of data consumed else error code on failure.
1017 ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
1019 struct aa_policy *policy;
1020 struct aa_profile *old_profile = NULL, *new_profile = NULL;
1021 struct aa_profile *rename_profile = NULL;
1022 struct aa_namespace *ns = NULL;
1023 const char *ns_name, *name = NULL, *info = NULL;
1024 int op = OP_PROF_REPL;
1027 /* released below */
1028 new_profile = aa_unpack(udata, size, &ns_name);
1029 if (IS_ERR(new_profile)) {
1030 error = PTR_ERR(new_profile);
1035 /* released below */
1036 ns = aa_prepare_namespace(ns_name);
1038 info = "failed to prepare namespace";
1044 name = new_profile->base.hname;
1046 write_lock(&ns->lock);
1047 /* no ref on policy only use inside lock */
1048 policy = __lookup_parent(ns, new_profile->base.hname);
1051 info = "parent does not exist";
1056 old_profile = __find_child(&policy->profiles, new_profile->base.name);
1057 /* released below */
1058 aa_get_profile(old_profile);
1060 if (new_profile->rename) {
1061 rename_profile = __lookup_profile(&ns->base,
1062 new_profile->rename);
1063 /* released below */
1064 aa_get_profile(rename_profile);
1066 if (!rename_profile) {
1067 info = "profile to rename does not exist";
1068 name = new_profile->rename;
1074 error = replacement_allowed(old_profile, noreplace, &info);
1078 error = replacement_allowed(rename_profile, noreplace, &info);
1083 if (!old_profile && !rename_profile)
1086 error = audit_policy(op, GFP_ATOMIC, name, info, error);
1090 __replace_profile(rename_profile, new_profile);
1092 /* when there are both rename and old profiles
1093 * inherit old profiles sid
1096 aa_free_sid(new_profile->sid);
1097 __replace_profile(old_profile, new_profile);
1099 if (!(old_profile || rename_profile))
1100 __add_new_profile(ns, policy, new_profile);
1102 write_unlock(&ns->lock);
1105 aa_put_namespace(ns);
1106 aa_put_profile(rename_profile);
1107 aa_put_profile(old_profile);
1108 aa_put_profile(new_profile);
1114 error = audit_policy(op, GFP_KERNEL, name, info, error);
1119 * aa_remove_profiles - remove profile(s) from the system
1120 * @fqname: name of the profile or namespace to remove (NOT NULL)
1121 * @size: size of the name
1123 * Remove a profile or sub namespace from the current namespace, so that
1124 * they can not be found anymore and mark them as replaced by unconfined
1126 * NOTE: removing confinement does not restore rlimits to preconfinemnet values
1128 * Returns: size of data consume else error code if fails
1130 ssize_t aa_remove_profiles(char *fqname, size_t size)
1132 struct aa_namespace *root, *ns = NULL;
1133 struct aa_profile *profile = NULL;
1134 const char *name = fqname, *info = NULL;
1138 info = "no profile specified";
1143 root = aa_current_profile()->ns;
1145 if (fqname[0] == ':') {
1147 name = aa_split_fqname(fqname, &ns_name);
1149 /* released below */
1150 ns = aa_find_namespace(root, ns_name);
1152 info = "namespace does not exist";
1158 /* released below */
1159 ns = aa_get_namespace(root);
1162 /* remove namespace - can only happen if fqname[0] == ':' */
1163 write_lock(&ns->parent->lock);
1164 __remove_namespace(ns);
1165 write_unlock(&ns->parent->lock);
1167 /* remove profile */
1168 write_lock(&ns->lock);
1169 profile = aa_get_profile(__lookup_profile(&ns->base, name));
1172 info = "profile does not exist";
1175 name = profile->base.hname;
1176 __remove_profile(profile);
1177 write_unlock(&ns->lock);
1180 /* don't fail removal if audit fails */
1181 (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error);
1182 aa_put_namespace(ns);
1183 aa_put_profile(profile);
1187 write_unlock(&ns->lock);
1188 aa_put_namespace(ns);
1191 (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error);