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"
92 /* root profile namespace */
93 struct aa_namespace
*root_ns
;
95 const char *const aa_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
);
150 * policy_destroy - free the elements referenced by @policy
151 * @policy: policy that is to have its elements freed (NOT NULL)
153 static void policy_destroy(struct aa_policy
*policy
)
155 /* still contains profiles -- invalid */
156 if (on_list_rcu(&policy
->profiles
)) {
157 AA_ERROR("%s: internal error, "
158 "policy '%s' still contains profiles\n",
159 __func__
, policy
->name
);
162 if (on_list_rcu(&policy
->list
)) {
163 AA_ERROR("%s: internal error, policy '%s' still on list\n",
164 __func__
, policy
->name
);
168 /* don't free name as its a subset of hname */
169 kzfree(policy
->hname
);
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)
177 * Requires: rcu_read_lock be held
179 * Returns: unrefcounted policy that match @name or NULL if not found
181 static struct aa_policy
*__policy_find(struct list_head
*head
, const char *name
)
183 struct aa_policy
*policy
;
185 list_for_each_entry_rcu(policy
, head
, list
) {
186 if (!strcmp(policy
->name
, name
))
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
198 * Requires: rcu_read_lock be held
200 * Returns: unrefcounted policy that match @str or NULL if not found
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
205 static struct aa_policy
*__policy_strn_find(struct list_head
*head
,
206 const char *str
, int len
)
208 struct aa_policy
*policy
;
210 list_for_each_entry_rcu(policy
, head
, list
) {
211 if (aa_strneq(policy
->name
, str
, len
))
219 * Routines for AppArmor namespaces
222 static const char *hidden_ns_name
= "---";
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)
228 * Returns: true if @view is visible from @curr else false
230 bool aa_ns_visible(struct aa_namespace
*curr
, struct aa_namespace
*view
)
235 for ( ; view
; view
= view
->parent
) {
236 if (view
->parent
== curr
)
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)
247 * Returns: name of @view visible from @curr
249 const char *aa_ns_name(struct aa_namespace
*curr
, struct aa_namespace
*view
)
251 /* if view == curr then the namespace name isn't displayed */
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
262 return view
->base
.hname
+ strlen(curr
->base
.hname
) + 2;
264 return hidden_ns_name
;
268 * alloc_namespace - allocate, initialize and return a new namespace
269 * @prefix: parent namespace name (MAYBE NULL)
270 * @name: a preallocated name (NOT NULL)
272 * Returns: refcounted namespace or NULL on failure.
274 static struct aa_namespace
*alloc_namespace(const char *prefix
,
277 struct aa_namespace
*ns
;
279 ns
= kzalloc(sizeof(*ns
), GFP_KERNEL
);
280 AA_DEBUG("%s(%p)\n", __func__
, ns
);
283 if (!policy_init(&ns
->base
, prefix
, name
))
286 INIT_LIST_HEAD(&ns
->sub_ns
);
287 mutex_init(&ns
->lock
);
289 /* released by free_namespace */
290 ns
->unconfined
= aa_alloc_profile("unconfined");
292 goto fail_unconfined
;
294 ns
->unconfined
->flags
= PFLAG_IX_ON_NAME_ERROR
|
295 PFLAG_IMMUTABLE
| PFLAG_NS_COUNT
;
296 ns
->unconfined
->mode
= APPARMOR_UNCONFINED
;
298 /* ns and ns->unconfined share ns->unconfined refcount */
299 ns
->unconfined
->ns
= ns
;
301 atomic_set(&ns
->uniq_null
, 0);
306 kzfree(ns
->base
.hname
);
313 * free_namespace - free a profile namespace
314 * @ns: the namespace to free (MAYBE NULL)
316 * Requires: All references to the namespace must have been put, if the
317 * namespace was referenced by a profile confining a task,
319 static void free_namespace(struct aa_namespace
*ns
)
324 policy_destroy(&ns
->base
);
325 aa_put_namespace(ns
->parent
);
327 ns
->unconfined
->ns
= NULL
;
328 aa_free_profile(ns
->unconfined
);
333 * __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)
337 * Returns: unrefcounted namespace
339 * Requires: rcu_read_lock be held
341 static struct aa_namespace
*__aa_find_namespace(struct list_head
*head
,
344 return (struct aa_namespace
*)__policy_find(head
, name
);
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)
352 * Returns: a refcounted namespace on the list, or NULL if no namespace
353 * called @name exists.
355 * refcount released by caller
357 struct aa_namespace
*aa_find_namespace(struct aa_namespace
*root
,
360 struct aa_namespace
*ns
= NULL
;
363 ns
= aa_get_namespace(__aa_find_namespace(&root
->sub_ns
, name
));
370 * aa_prepare_namespace - find an existing or create a new namespace of @name
371 * @name: the namespace to find or add (MAYBE NULL)
373 * Returns: refcounted namespace or NULL if failed to create one
375 static struct aa_namespace
*aa_prepare_namespace(const char *name
)
377 struct aa_namespace
*ns
, *root
;
379 root
= aa_current_profile()->ns
;
381 mutex_lock(&root
->lock
);
383 /* if name isn't specified the profile is loaded to the current ns */
385 /* released by caller */
386 ns
= aa_get_namespace(root
);
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
));
394 ns
= alloc_namespace(root
->base
.hname
, name
);
397 if (__aa_fs_namespace_mkdir(ns
, ns_subns_dir(root
), name
)) {
398 AA_ERROR("Failed to create interface for ns %s\n",
404 ns
->parent
= aa_get_namespace(root
);
405 list_add_rcu(&ns
->base
.list
, &root
->sub_ns
);
407 aa_get_namespace(ns
);
410 mutex_unlock(&root
->lock
);
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)
421 * refcount @profile, should be put by __list_remove_profile
423 * Requires: namespace lock be held, or list not be shared
425 static void __list_add_profile(struct list_head
*list
,
426 struct aa_profile
*profile
)
428 list_add_rcu(&profile
->base
.list
, list
);
429 /* get list reference */
430 aa_get_profile(profile
);
434 * __list_remove_profile - remove a profile from the list it is on
435 * @profile: the profile to remove (NOT NULL)
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.
441 * put @profile list refcount
443 * Requires: namespace lock be held, or list not have been live
445 static void __list_remove_profile(struct aa_profile
*profile
)
447 list_del_rcu(&profile
->base
.list
);
448 aa_put_profile(profile
);
451 static void __profile_list_release(struct list_head
*head
);
454 * __remove_profile - remove old profile, and children
455 * @profile: profile to be replaced (NOT NULL)
457 * Requires: namespace list lock be held, or list not be shared
459 static void __remove_profile(struct aa_profile
*profile
)
461 /* release any children lists first */
462 __profile_list_release(&profile
->base
.profiles
);
463 /* released by free_profile */
464 __aa_update_replacedby(profile
, profile
->ns
->unconfined
);
465 __aa_fs_profile_rmdir(profile
);
466 __list_remove_profile(profile
);
470 * __profile_list_release - remove all profiles on the list and put refs
471 * @head: list of profiles (NOT NULL)
473 * Requires: namespace lock be held
475 static void __profile_list_release(struct list_head
*head
)
477 struct aa_profile
*profile
, *tmp
;
478 list_for_each_entry_safe(profile
, tmp
, head
, base
.list
)
479 __remove_profile(profile
);
482 static void __ns_list_release(struct list_head
*head
);
485 * destroy_namespace - remove everything contained by @ns
486 * @ns: namespace to have it contents removed (NOT NULL)
488 static void destroy_namespace(struct aa_namespace
*ns
)
493 mutex_lock(&ns
->lock
);
494 /* release all profiles in this namespace */
495 __profile_list_release(&ns
->base
.profiles
);
497 /* release all sub namespaces */
498 __ns_list_release(&ns
->sub_ns
);
501 __aa_update_replacedby(ns
->unconfined
, ns
->parent
->unconfined
);
502 __aa_fs_namespace_rmdir(ns
);
503 mutex_unlock(&ns
->lock
);
507 * __remove_namespace - remove a namespace and all its children
508 * @ns: namespace to be removed (NOT NULL)
510 * Requires: ns->parent->lock be held and ns removed from parent.
512 static void __remove_namespace(struct aa_namespace
*ns
)
514 /* remove ns from namespace list */
515 list_del_rcu(&ns
->base
.list
);
516 destroy_namespace(ns
);
517 aa_put_namespace(ns
);
521 * __ns_list_release - remove all profile namespaces on the list put refs
522 * @head: list of profile namespaces (NOT NULL)
524 * Requires: namespace lock be held
526 static void __ns_list_release(struct list_head
*head
)
528 struct aa_namespace
*ns
, *tmp
;
529 list_for_each_entry_safe(ns
, tmp
, head
, base
.list
)
530 __remove_namespace(ns
);
535 * aa_alloc_root_ns - allocate the root profile namespace
537 * Returns: %0 on success else error
540 int __init
aa_alloc_root_ns(void)
542 /* released by aa_free_root_ns - used as list ref*/
543 root_ns
= alloc_namespace(NULL
, "root");
551 * aa_free_root_ns - free the root profile namespace
553 void __init
aa_free_root_ns(void)
555 struct aa_namespace
*ns
= root_ns
;
558 destroy_namespace(ns
);
559 aa_put_namespace(ns
);
563 static void free_replacedby(struct aa_replacedby
*r
)
566 aa_put_profile(rcu_dereference(r
->profile
));
572 void aa_free_replacedby_kref(struct kref
*kref
)
574 struct aa_replacedby
*r
= container_of(kref
, struct aa_replacedby
,
580 * aa_free_profile - free a profile
581 * @profile: the profile to free (MAYBE NULL)
583 * Free a profile, its hats and null_profile. All references to the profile,
584 * its hats and null_profile must have been put.
586 * If the profile was referenced from a task context, free_profile() will
587 * be called from an rcu callback routine, so we must not sleep here.
589 void aa_free_profile(struct aa_profile
*profile
)
591 AA_DEBUG("%s(%p)\n", __func__
, profile
);
596 /* free children profiles */
597 policy_destroy(&profile
->base
);
598 aa_put_profile(rcu_access_pointer(profile
->parent
));
600 aa_put_namespace(profile
->ns
);
601 kzfree(profile
->rename
);
603 aa_free_file_rules(&profile
->file
);
604 aa_free_cap_rules(&profile
->caps
);
605 aa_free_rlimit_rules(&profile
->rlimits
);
607 kzfree(profile
->dirname
);
608 aa_put_dfa(profile
->xmatch
);
609 aa_put_dfa(profile
->policy
.dfa
);
610 aa_put_replacedby(profile
->replacedby
);
616 * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref)
617 * @head: rcu_head callback for freeing of a profile (NOT NULL)
619 static void aa_free_profile_rcu(struct rcu_head
*head
)
621 struct aa_profile
*p
= container_of(head
, struct aa_profile
, rcu
);
622 if (p
->flags
& PFLAG_NS_COUNT
)
623 free_namespace(p
->ns
);
629 * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile)
630 * @kr: kref callback for freeing of a profile (NOT NULL)
632 void aa_free_profile_kref(struct kref
*kref
)
634 struct aa_profile
*p
= container_of(kref
, struct aa_profile
, count
);
635 call_rcu(&p
->rcu
, aa_free_profile_rcu
);
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 profile
->replacedby
= kzalloc(sizeof(struct aa_replacedby
), GFP_KERNEL
);
654 if (!profile
->replacedby
)
656 kref_init(&profile
->replacedby
->count
);
658 if (!policy_init(&profile
->base
, NULL
, hname
))
660 kref_init(&profile
->count
);
662 /* refcount released by caller */
666 kzfree(profile
->replacedby
);
673 * aa_new_null_profile - create a new null-X learning profile
674 * @parent: profile that caused this profile to be created (NOT NULL)
675 * @hat: true if the null- learning profile is a hat
677 * Create a null- complain mode profile used in learning mode. The name of
678 * the profile is unique and follows the format of parent//null-<uniq>.
680 * null profiles are added to the profile list but the list does not
681 * hold a count on them so that they are automatically released when
684 * Returns: new refcounted profile else NULL on failure
686 struct aa_profile
*aa_new_null_profile(struct aa_profile
*parent
, int hat
)
688 struct aa_profile
*profile
= NULL
;
690 int uniq
= atomic_inc_return(&parent
->ns
->uniq_null
);
693 name
= kmalloc(strlen(parent
->base
.hname
) + 2 + 7 + 8, GFP_KERNEL
);
696 sprintf(name
, "%s//null-%x", parent
->base
.hname
, uniq
);
698 profile
= aa_alloc_profile(name
);
703 profile
->mode
= APPARMOR_COMPLAIN
;
704 profile
->flags
= PFLAG_NULL
;
706 profile
->flags
|= PFLAG_HAT
;
708 /* released on free_profile */
709 rcu_assign_pointer(profile
->parent
, aa_get_profile(parent
));
710 profile
->ns
= aa_get_namespace(parent
->ns
);
712 mutex_lock(&profile
->ns
->lock
);
713 __list_add_profile(&parent
->base
.profiles
, profile
);
714 mutex_unlock(&profile
->ns
->lock
);
716 /* refcount released by caller */
723 /* TODO: profile accounting - setup in remove */
726 * __find_child - find a profile on @head list with a name matching @name
727 * @head: list to search (NOT NULL)
728 * @name: name of profile (NOT NULL)
730 * Requires: rcu_read_lock be held
732 * Returns: unrefcounted profile ptr, or NULL if not found
734 static struct aa_profile
*__find_child(struct list_head
*head
, const char *name
)
736 return (struct aa_profile
*)__policy_find(head
, name
);
740 * __strn_find_child - find a profile on @head list using substring of @name
741 * @head: list to search (NOT NULL)
742 * @name: name of profile (NOT NULL)
743 * @len: length of @name substring to match
745 * Requires: rcu_read_lock be held
747 * Returns: unrefcounted profile ptr, or NULL if not found
749 static struct aa_profile
*__strn_find_child(struct list_head
*head
,
750 const char *name
, int len
)
752 return (struct aa_profile
*)__policy_strn_find(head
, name
, len
);
756 * aa_find_child - find a profile by @name in @parent
757 * @parent: profile to search (NOT NULL)
758 * @name: profile name to search for (NOT NULL)
760 * Returns: a refcounted profile or NULL if not found
762 struct aa_profile
*aa_find_child(struct aa_profile
*parent
, const char *name
)
764 struct aa_profile
*profile
;
767 profile
= aa_get_profile(__find_child(&parent
->base
.profiles
, name
));
770 /* refcount released by caller */
775 * __lookup_parent - lookup the parent of a profile of name @hname
776 * @ns: namespace to lookup profile in (NOT NULL)
777 * @hname: hierarchical profile name to find parent of (NOT NULL)
779 * Lookups up the parent of a fully qualified profile name, the profile
780 * that matches hname does not need to exist, in general this
781 * is used to load a new profile.
783 * Requires: rcu_read_lock be held
785 * Returns: unrefcounted policy or NULL if not found
787 static struct aa_policy
*__lookup_parent(struct aa_namespace
*ns
,
790 struct aa_policy
*policy
;
791 struct aa_profile
*profile
= NULL
;
796 for (split
= strstr(hname
, "//"); split
;) {
797 profile
= __strn_find_child(&policy
->profiles
, hname
,
801 policy
= &profile
->base
;
803 split
= strstr(hname
, "//");
807 return &profile
->base
;
811 * __lookup_profile - lookup the profile matching @hname
812 * @base: base list to start looking up profile name from (NOT NULL)
813 * @hname: hierarchical profile name (NOT NULL)
815 * Requires: rcu_read_lock be held
817 * Returns: unrefcounted profile pointer or NULL if not found
819 * Do a relative name lookup, recursing through profile tree.
821 static struct aa_profile
*__lookup_profile(struct aa_policy
*base
,
824 struct aa_profile
*profile
= NULL
;
827 for (split
= strstr(hname
, "//"); split
;) {
828 profile
= __strn_find_child(&base
->profiles
, hname
,
833 base
= &profile
->base
;
835 split
= strstr(hname
, "//");
838 profile
= __find_child(&base
->profiles
, hname
);
844 * aa_lookup_profile - find a profile by its full or partial name
845 * @ns: the namespace to start from (NOT NULL)
846 * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL)
848 * Returns: refcounted profile or NULL if not found
850 struct aa_profile
*aa_lookup_profile(struct aa_namespace
*ns
, const char *hname
)
852 struct aa_profile
*profile
;
856 profile
= __lookup_profile(&ns
->base
, hname
);
857 } while (profile
&& !aa_get_profile_not0(profile
));
860 /* the unconfined profile is not in the regular profile list */
861 if (!profile
&& strcmp(hname
, "unconfined") == 0)
862 profile
= aa_get_newest_profile(ns
->unconfined
);
864 /* refcount released by caller */
869 * replacement_allowed - test to see if replacement is allowed
870 * @profile: profile to test if it can be replaced (MAYBE NULL)
871 * @noreplace: true if replacement shouldn't be allowed but addition is okay
872 * @info: Returns - info about why replacement failed (NOT NULL)
874 * Returns: %0 if replacement allowed else error code
876 static int replacement_allowed(struct aa_profile
*profile
, int noreplace
,
880 if (profile
->flags
& PFLAG_IMMUTABLE
) {
881 *info
= "cannot replace immutible profile";
883 } else if (noreplace
) {
884 *info
= "profile already exists";
892 * aa_audit_policy - Do auditing of policy changes
893 * @op: policy operation being performed
894 * @gfp: memory allocation flags
895 * @name: name of profile being manipulated (NOT NULL)
896 * @info: any extra information to be audited (MAYBE NULL)
899 * Returns: the error to be returned after audit is done
901 static int audit_policy(int op
, gfp_t gfp
, const char *name
, const char *info
,
904 struct common_audit_data sa
;
905 struct apparmor_audit_data aad
= {0,};
906 sa
.type
= LSM_AUDIT_DATA_NONE
;
913 return aa_audit(AUDIT_APPARMOR_STATUS
, __aa_current_profile(), gfp
,
918 * aa_may_manage_policy - can the current task manage policy
919 * @op: the policy manipulation operation being done
921 * Returns: true if the task is allowed to manipulate policy
923 bool aa_may_manage_policy(int op
)
925 /* check if loading policy is locked out */
926 if (aa_g_lock_policy
) {
927 audit_policy(op
, GFP_KERNEL
, NULL
, "policy_locked", -EACCES
);
931 if (!capable(CAP_MAC_ADMIN
)) {
932 audit_policy(op
, GFP_KERNEL
, NULL
, "not policy admin", -EACCES
);
939 static struct aa_profile
*__list_lookup_parent(struct list_head
*lh
,
940 struct aa_profile
*profile
)
942 const char *base
= hname_tail(profile
->base
.hname
);
943 long len
= base
- profile
->base
.hname
;
944 struct aa_load_ent
*ent
;
946 /* parent won't have trailing // so remove from len */
951 list_for_each_entry(ent
, lh
, list
) {
952 if (ent
->new == profile
)
954 if (strncmp(ent
->new->base
.hname
, profile
->base
.hname
, len
) ==
955 0 && ent
->new->base
.hname
[len
] == 0)
963 * __replace_profile - replace @old with @new on a list
964 * @old: profile to be replaced (NOT NULL)
965 * @new: profile to replace @old with (NOT NULL)
966 * @share_replacedby: transfer @old->replacedby to @new
968 * Will duplicate and refcount elements that @new inherits from @old
969 * and will inherit @old children.
971 * refcount @new for list, put @old list refcount
973 * Requires: namespace list lock be held, or list not be shared
975 static void __replace_profile(struct aa_profile
*old
, struct aa_profile
*new,
976 bool share_replacedby
)
978 struct aa_profile
*child
, *tmp
;
980 if (!list_empty(&old
->base
.profiles
)) {
982 list_splice_init_rcu(&old
->base
.profiles
, &lh
, synchronize_rcu
);
984 list_for_each_entry_safe(child
, tmp
, &lh
, base
.list
) {
985 struct aa_profile
*p
;
987 list_del_init(&child
->base
.list
);
988 p
= __find_child(&new->base
.profiles
, child
->base
.name
);
990 /* @p replaces @child */
991 __replace_profile(child
, p
, share_replacedby
);
995 /* inherit @child and its children */
996 /* TODO: update hname of inherited children */
997 /* list refcount transferred to @new */
998 p
= aa_deref_parent(child
);
999 rcu_assign_pointer(child
->parent
, aa_get_profile(new));
1000 list_add_rcu(&child
->base
.list
, &new->base
.profiles
);
1005 if (!rcu_access_pointer(new->parent
)) {
1006 struct aa_profile
*parent
= aa_deref_parent(old
);
1007 rcu_assign_pointer(new->parent
, aa_get_profile(parent
));
1009 __aa_update_replacedby(old
, new);
1010 if (share_replacedby
) {
1011 aa_put_replacedby(new->replacedby
);
1012 new->replacedby
= aa_get_replacedby(old
->replacedby
);
1013 } else if (!rcu_access_pointer(new->replacedby
->profile
))
1014 /* aafs interface uses replacedby */
1015 rcu_assign_pointer(new->replacedby
->profile
,
1016 aa_get_profile(new));
1017 __aa_fs_profile_migrate_dents(old
, new);
1019 if (list_empty(&new->base
.list
)) {
1020 /* new is not on a list already */
1021 list_replace_rcu(&old
->base
.list
, &new->base
.list
);
1022 aa_get_profile(new);
1023 aa_put_profile(old
);
1025 __list_remove_profile(old
);
1029 * __lookup_replace - lookup replacement information for a profile
1030 * @ns - namespace the lookup occurs in
1031 * @hname - name of profile to lookup
1032 * @noreplace - true if not replacing an existing profile
1033 * @p - Returns: profile to be replaced
1034 * @info - Returns: info string on why lookup failed
1036 * Returns: profile to replace (no ref) on success else ptr error
1038 static int __lookup_replace(struct aa_namespace
*ns
, const char *hname
,
1039 bool noreplace
, struct aa_profile
**p
,
1042 *p
= aa_get_profile(__lookup_profile(&ns
->base
, hname
));
1044 int error
= replacement_allowed(*p
, noreplace
, info
);
1046 *info
= "profile can not be replaced";
1055 * aa_replace_profiles - replace profile(s) on the profile list
1056 * @udata: serialized data stream (NOT NULL)
1057 * @size: size of the serialized data stream
1058 * @noreplace: true if only doing addition, no replacement allowed
1060 * unpack and replace a profile on the profile list and uses of that profile
1061 * by any aa_task_cxt. If the profile does not exist on the profile list
1064 * Returns: size of data consumed else error code on failure.
1066 ssize_t
aa_replace_profiles(void *udata
, size_t size
, bool noreplace
)
1068 const char *ns_name
, *name
= NULL
, *info
= NULL
;
1069 struct aa_namespace
*ns
= NULL
;
1070 struct aa_load_ent
*ent
, *tmp
;
1071 int op
= OP_PROF_REPL
;
1075 /* released below */
1076 error
= aa_unpack(udata
, size
, &lh
, &ns_name
);
1080 /* released below */
1081 ns
= aa_prepare_namespace(ns_name
);
1083 info
= "failed to prepare namespace";
1089 mutex_lock(&ns
->lock
);
1090 /* setup parent and ns info */
1091 list_for_each_entry(ent
, &lh
, list
) {
1092 struct aa_policy
*policy
;
1094 name
= ent
->new->base
.hname
;
1095 error
= __lookup_replace(ns
, ent
->new->base
.hname
, noreplace
,
1100 if (ent
->new->rename
) {
1101 error
= __lookup_replace(ns
, ent
->new->rename
,
1102 noreplace
, &ent
->rename
,
1108 /* released when @new is freed */
1109 ent
->new->ns
= aa_get_namespace(ns
);
1111 if (ent
->old
|| ent
->rename
)
1114 /* no ref on policy only use inside lock */
1115 policy
= __lookup_parent(ns
, ent
->new->base
.hname
);
1117 struct aa_profile
*p
;
1118 p
= __list_lookup_parent(&lh
, ent
->new);
1121 info
= "parent does not exist";
1122 name
= ent
->new->base
.hname
;
1125 rcu_assign_pointer(ent
->new->parent
, aa_get_profile(p
));
1126 } else if (policy
!= &ns
->base
) {
1127 /* released on profile replacement or free_profile */
1128 struct aa_profile
*p
= (struct aa_profile
*) policy
;
1129 rcu_assign_pointer(ent
->new->parent
, aa_get_profile(p
));
1133 /* create new fs entries for introspection if needed */
1134 list_for_each_entry(ent
, &lh
, list
) {
1136 /* inherit old interface files */
1139 TODO: support rename */
1140 /* } else if (ent->rename) {
1141 TODO: support rename */
1143 struct dentry
*parent
;
1144 if (rcu_access_pointer(ent
->new->parent
)) {
1145 struct aa_profile
*p
;
1146 p
= aa_deref_parent(ent
->new);
1147 parent
= prof_child_dir(p
);
1149 parent
= ns_subprofs_dir(ent
->new->ns
);
1150 error
= __aa_fs_profile_mkdir(ent
->new, parent
);
1154 info
= "failed to create ";
1159 /* Done with checks that may fail - do actual replacement */
1160 list_for_each_entry_safe(ent
, tmp
, &lh
, list
) {
1161 list_del_init(&ent
->list
);
1162 op
= (!ent
->old
&& !ent
->rename
) ? OP_PROF_LOAD
: OP_PROF_REPL
;
1164 audit_policy(op
, GFP_ATOMIC
, ent
->new->base
.name
, NULL
, error
);
1167 __replace_profile(ent
->old
, ent
->new, 1);
1169 /* aafs interface uses replacedby */
1170 struct aa_replacedby
*r
= ent
->new->replacedby
;
1171 rcu_assign_pointer(r
->profile
,
1172 aa_get_profile(ent
->new));
1173 __replace_profile(ent
->rename
, ent
->new, 0);
1175 } else if (ent
->rename
) {
1176 /* aafs interface uses replacedby */
1177 rcu_assign_pointer(ent
->new->replacedby
->profile
,
1178 aa_get_profile(ent
->new));
1179 __replace_profile(ent
->rename
, ent
->new, 0);
1180 } else if (ent
->new->parent
) {
1181 struct aa_profile
*parent
, *newest
;
1182 parent
= aa_deref_parent(ent
->new);
1183 newest
= aa_get_newest_profile(parent
);
1185 /* parent replaced in this atomic set? */
1186 if (newest
!= parent
) {
1187 aa_get_profile(newest
);
1188 aa_put_profile(parent
);
1189 rcu_assign_pointer(ent
->new->parent
, newest
);
1191 aa_put_profile(newest
);
1192 /* aafs interface uses replacedby */
1193 rcu_assign_pointer(ent
->new->replacedby
->profile
,
1194 aa_get_profile(ent
->new));
1195 __list_add_profile(&parent
->base
.profiles
, ent
->new);
1197 /* aafs interface uses replacedby */
1198 rcu_assign_pointer(ent
->new->replacedby
->profile
,
1199 aa_get_profile(ent
->new));
1200 __list_add_profile(&ns
->base
.profiles
, ent
->new);
1202 aa_load_ent_free(ent
);
1204 mutex_unlock(&ns
->lock
);
1207 aa_put_namespace(ns
);
1214 mutex_unlock(&ns
->lock
);
1216 error
= audit_policy(op
, GFP_KERNEL
, name
, info
, error
);
1218 list_for_each_entry_safe(ent
, tmp
, &lh
, list
) {
1219 list_del_init(&ent
->list
);
1220 aa_load_ent_free(ent
);
1227 * aa_remove_profiles - remove profile(s) from the system
1228 * @fqname: name of the profile or namespace to remove (NOT NULL)
1229 * @size: size of the name
1231 * Remove a profile or sub namespace from the current namespace, so that
1232 * they can not be found anymore and mark them as replaced by unconfined
1234 * NOTE: removing confinement does not restore rlimits to preconfinemnet values
1236 * Returns: size of data consume else error code if fails
1238 ssize_t
aa_remove_profiles(char *fqname
, size_t size
)
1240 struct aa_namespace
*root
, *ns
= NULL
;
1241 struct aa_profile
*profile
= NULL
;
1242 const char *name
= fqname
, *info
= NULL
;
1246 info
= "no profile specified";
1251 root
= aa_current_profile()->ns
;
1253 if (fqname
[0] == ':') {
1255 name
= aa_split_fqname(fqname
, &ns_name
);
1256 /* released below */
1257 ns
= aa_find_namespace(root
, ns_name
);
1259 info
= "namespace does not exist";
1264 /* released below */
1265 ns
= aa_get_namespace(root
);
1268 /* remove namespace - can only happen if fqname[0] == ':' */
1269 mutex_lock(&ns
->parent
->lock
);
1270 __remove_namespace(ns
);
1271 mutex_unlock(&ns
->parent
->lock
);
1273 /* remove profile */
1274 mutex_lock(&ns
->lock
);
1275 profile
= aa_get_profile(__lookup_profile(&ns
->base
, name
));
1278 info
= "profile does not exist";
1281 name
= profile
->base
.hname
;
1282 __remove_profile(profile
);
1283 mutex_unlock(&ns
->lock
);
1286 /* don't fail removal if audit fails */
1287 (void) audit_policy(OP_PROF_RM
, GFP_KERNEL
, name
, info
, error
);
1288 aa_put_namespace(ns
);
1289 aa_put_profile(profile
);
1293 mutex_unlock(&ns
->lock
);
1294 aa_put_namespace(ns
);
1297 (void) audit_policy(OP_PROF_RM
, GFP_KERNEL
, name
, info
, error
);
This page took 0.059932 seconds and 5 git commands to generate.