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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - security/apparmor/policy.c
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 /* refcount released by caller */
911 * replacement_allowed - test to see if replacement is allowed
912 * @profile: profile to test if it can be replaced (MAYBE NULL)
913 * @noreplace: true if replacement shouldn't be allowed but addition is okay
914 * @info: Returns - info about why replacement failed (NOT NULL)
916 * Returns: %0 if replacement allowed else error code
918 static int replacement_allowed(struct aa_profile
*profile
, int noreplace
,
922 if (profile
->flags
& PFLAG_IMMUTABLE
) {
923 *info
= "cannot replace immutible profile";
925 } else if (noreplace
) {
926 *info
= "profile already exists";
934 * __add_new_profile - simple wrapper around __list_add_profile
935 * @ns: namespace that profile is being added to (NOT NULL)
936 * @policy: the policy container to add the profile to (NOT NULL)
937 * @profile: profile to add (NOT NULL)
939 * add a profile to a list and do other required basic allocations
941 static void __add_new_profile(struct aa_namespace
*ns
, struct aa_policy
*policy
,
942 struct aa_profile
*profile
)
944 if (policy
!= &ns
->base
)
945 /* released on profile replacement or free_profile */
946 profile
->parent
= aa_get_profile((struct aa_profile
*) policy
);
947 __list_add_profile(&policy
->profiles
, profile
);
948 /* released on free_profile */
949 profile
->sid
= aa_alloc_sid();
950 profile
->ns
= aa_get_namespace(ns
);
954 * aa_audit_policy - Do auditing of policy changes
955 * @op: policy operation being performed
956 * @gfp: memory allocation flags
957 * @name: name of profile being manipulated (NOT NULL)
958 * @info: any extra information to be audited (MAYBE NULL)
961 * Returns: the error to be returned after audit is done
963 static int audit_policy(int op
, gfp_t gfp
, const char *name
, const char *info
,
966 struct common_audit_data sa
;
967 struct apparmor_audit_data aad
= {0,};
968 COMMON_AUDIT_DATA_INIT(&sa
, NONE
);
975 return aa_audit(AUDIT_APPARMOR_STATUS
, __aa_current_profile(), gfp
,
980 * aa_may_manage_policy - can the current task manage policy
981 * @op: the policy manipulation operation being done
983 * Returns: true if the task is allowed to manipulate policy
985 bool aa_may_manage_policy(int op
)
987 /* check if loading policy is locked out */
988 if (aa_g_lock_policy
) {
989 audit_policy(op
, GFP_KERNEL
, NULL
, "policy_locked", -EACCES
);
993 if (!capable(CAP_MAC_ADMIN
)) {
994 audit_policy(op
, GFP_KERNEL
, NULL
, "not policy admin", -EACCES
);
1002 * aa_replace_profiles - replace profile(s) on the profile list
1003 * @udata: serialized data stream (NOT NULL)
1004 * @size: size of the serialized data stream
1005 * @noreplace: true if only doing addition, no replacement allowed
1007 * unpack and replace a profile on the profile list and uses of that profile
1008 * by any aa_task_cxt. If the profile does not exist on the profile list
1011 * Returns: size of data consumed else error code on failure.
1013 ssize_t
aa_replace_profiles(void *udata
, size_t size
, bool noreplace
)
1015 struct aa_policy
*policy
;
1016 struct aa_profile
*old_profile
= NULL
, *new_profile
= NULL
;
1017 struct aa_profile
*rename_profile
= NULL
;
1018 struct aa_namespace
*ns
= NULL
;
1019 const char *ns_name
, *name
= NULL
, *info
= NULL
;
1020 int op
= OP_PROF_REPL
;
1023 /* released below */
1024 new_profile
= aa_unpack(udata
, size
, &ns_name
);
1025 if (IS_ERR(new_profile
)) {
1026 error
= PTR_ERR(new_profile
);
1031 /* released below */
1032 ns
= aa_prepare_namespace(ns_name
);
1034 info
= "failed to prepare namespace";
1040 name
= new_profile
->base
.hname
;
1042 write_lock(&ns
->lock
);
1043 /* no ref on policy only use inside lock */
1044 policy
= __lookup_parent(ns
, new_profile
->base
.hname
);
1047 info
= "parent does not exist";
1052 old_profile
= __find_child(&policy
->profiles
, new_profile
->base
.name
);
1053 /* released below */
1054 aa_get_profile(old_profile
);
1056 if (new_profile
->rename
) {
1057 rename_profile
= __lookup_profile(&ns
->base
,
1058 new_profile
->rename
);
1059 /* released below */
1060 aa_get_profile(rename_profile
);
1062 if (!rename_profile
) {
1063 info
= "profile to rename does not exist";
1064 name
= new_profile
->rename
;
1070 error
= replacement_allowed(old_profile
, noreplace
, &info
);
1074 error
= replacement_allowed(rename_profile
, noreplace
, &info
);
1079 if (!old_profile
&& !rename_profile
)
1082 error
= audit_policy(op
, GFP_ATOMIC
, name
, info
, error
);
1086 __replace_profile(rename_profile
, new_profile
);
1088 /* when there are both rename and old profiles
1089 * inherit old profiles sid
1092 aa_free_sid(new_profile
->sid
);
1093 __replace_profile(old_profile
, new_profile
);
1095 if (!(old_profile
|| rename_profile
))
1096 __add_new_profile(ns
, policy
, new_profile
);
1098 write_unlock(&ns
->lock
);
1101 aa_put_namespace(ns
);
1102 aa_put_profile(rename_profile
);
1103 aa_put_profile(old_profile
);
1104 aa_put_profile(new_profile
);
1110 error
= audit_policy(op
, GFP_KERNEL
, name
, info
, error
);
1115 * aa_remove_profiles - remove profile(s) from the system
1116 * @fqname: name of the profile or namespace to remove (NOT NULL)
1117 * @size: size of the name
1119 * Remove a profile or sub namespace from the current namespace, so that
1120 * they can not be found anymore and mark them as replaced by unconfined
1122 * NOTE: removing confinement does not restore rlimits to preconfinemnet values
1124 * Returns: size of data consume else error code if fails
1126 ssize_t
aa_remove_profiles(char *fqname
, size_t size
)
1128 struct aa_namespace
*root
, *ns
= NULL
;
1129 struct aa_profile
*profile
= NULL
;
1130 const char *name
= fqname
, *info
= NULL
;
1134 info
= "no profile specified";
1139 root
= aa_current_profile()->ns
;
1141 if (fqname
[0] == ':') {
1143 name
= aa_split_fqname(fqname
, &ns_name
);
1145 /* released below */
1146 ns
= aa_find_namespace(root
, ns_name
);
1148 info
= "namespace does not exist";
1154 /* released below */
1155 ns
= aa_get_namespace(root
);
1158 /* remove namespace - can only happen if fqname[0] == ':' */
1159 write_lock(&ns
->parent
->lock
);
1160 __remove_namespace(ns
);
1161 write_unlock(&ns
->parent
->lock
);
1163 /* remove profile */
1164 write_lock(&ns
->lock
);
1165 profile
= aa_get_profile(__lookup_profile(&ns
->base
, name
));
1168 info
= "profile does not exist";
1171 name
= profile
->base
.hname
;
1172 __remove_profile(profile
);
1173 write_unlock(&ns
->lock
);
1176 /* don't fail removal if audit fails */
1177 (void) audit_policy(OP_PROF_RM
, GFP_KERNEL
, name
, info
, error
);
1178 aa_put_namespace(ns
);
1179 aa_put_profile(profile
);
1183 write_unlock(&ns
->lock
);
1184 aa_put_namespace(ns
);
1187 (void) audit_policy(OP_PROF_RM
, GFP_KERNEL
, name
, info
, error
);