2 * AppArmor security module
4 * This file contains AppArmor policy definitions.
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
18 #include <linux/capability.h>
19 #include <linux/cred.h>
20 #include <linux/kref.h>
21 #include <linux/sched.h>
22 #include <linux/slab.h>
23 #include <linux/socket.h>
27 #include "capability.h"
32 extern const char *const profile_mode_names[];
33 #define APPARMOR_NAMES_MAX_INDEX 3
35 #define PROFILE_MODE(_profile, _mode) \
36 ((aa_g_profile_mode == (_mode)) || \
37 ((_profile)->mode == (_mode)))
39 #define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN)
41 #define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL)
43 #define PROFILE_IS_HAT(_profile) ((_profile)->flags & PFLAG_HAT)
45 #define PROFILE_INVALID(_profile) ((_profile)->flags & PFLAG_INVALID)
47 #define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)
50 * FIXME: currently need a clean way to replace and remove profiles as a
51 * set. It should be done at the namespace level.
52 * Either, with a set of profiles loaded at the namespace level or via
53 * a mark and remove marked interface.
56 APPARMOR_ENFORCE, /* enforce access rules */
57 APPARMOR_COMPLAIN, /* allow and log access violations */
58 APPARMOR_KILL, /* kill task on access violation */
62 PFLAG_HAT = 1, /* profile is a hat */
63 PFLAG_UNCONFINED = 2, /* profile is an unconfined profile */
64 PFLAG_NULL = 4, /* profile is null learning profile */
65 PFLAG_IX_ON_NAME_ERROR = 8, /* fallback to ix on name lookup fail */
66 PFLAG_IMMUTABLE = 0x10, /* don't allow changes/replacement */
67 PFLAG_USER_DEFINED = 0x20, /* user based profile - lower privs */
68 PFLAG_NO_LIST_REF = 0x40, /* list doesn't keep profile ref */
69 PFLAG_OLD_NULL_TRANS = 0x100, /* use // as the null transition */
70 PFLAG_INVALID = 0x200, /* profile replaced/removed */
71 PFLAG_NS_COUNT = 0x400, /* carries NS ref count */
73 /* These flags must correspond with PATH_flags */
74 PFLAG_MEDIATE_DELETED = 0x10000, /* mediate instead delegate deleted */
79 /* struct aa_policy - common part of both namespaces and profiles
80 * @name: name of the object
81 * @hname - The hierarchical name
82 * @list: list policy object is on
83 * @profiles: head of the profiles list contained in the object
88 struct list_head list;
89 struct list_head profiles;
92 /* struct aa_ns_acct - accounting of profiles in namespace
93 * @max_size: maximum space allowed for all profiles in namespace
94 * @max_count: maximum number of profiles that can be in this namespace
95 * @size: current size of profiles
96 * @count: current count of profiles (includes null profiles)
105 /* struct aa_namespace - namespace for a set of profiles
106 * @base: common policy
107 * @parent: parent of namespace
108 * @lock: lock for modifying the object
109 * @acct: accounting for the namespace
110 * @unconfined: special unconfined profile for the namespace
111 * @sub_ns: list of namespaces under the current namespace.
112 * @uniq_null: uniq value used for null learning profiles
114 * An aa_namespace defines the set profiles that are searched to determine
115 * which profile to attach to a task. Profiles can not be shared between
116 * aa_namespaces and profile names within a namespace are guaranteed to be
117 * unique. When profiles in separate namespaces have the same name they
118 * are NOT considered to be equivalent.
120 * Namespaces are hierarchical and only namespaces and profiles below the
121 * current namespace are visible.
123 * Namespace names must be unique and can not contain the characters :/\0
125 * FIXME TODO: add vserver support of namespaces (can it all be done in
128 struct aa_namespace {
129 struct aa_policy base;
130 struct aa_namespace *parent;
132 struct aa_ns_acct acct;
133 struct aa_profile *unconfined;
134 struct list_head sub_ns;
138 /* struct aa_policydb - match engine for a policy
139 * dfa: dfa pattern match
140 * start: set of start states for the different classes of data
143 /* Generic policy DFA specific rule types will be subsections of it */
145 unsigned int start[AA_CLASS_LAST + 1];
149 struct aa_replacedby {
151 struct aa_profile __rcu *profile;
155 /* struct aa_profile - basic confinement data
156 * @base - base components of the profile (name, refcount, lists, lock ...)
157 * @count: reference count of the obj
158 * @rcu: rcu head used when removing from @list
159 * @parent: parent of profile
160 * @ns: namespace the profile is in
161 * @replacedby: is set to the profile that replaced this profile
162 * @rename: optional profile name that this profile renamed
163 * @xmatch: optional extended matching for unconfined executables names
164 * @xmatch_len: xmatch prefix len, used to determine xmatch priority
165 * @audit: the auditing mode of the profile
166 * @mode: the enforcement mode of the profile
167 * @flags: flags controlling profile behavior
168 * @path_flags: flags controlling path generation behavior
169 * @size: the memory consumed by this profiles rules
170 * @policy: general match rules governing policy
171 * @file: The set of rules governing basic file access and domain transitions
172 * @caps: capabilities for the profile
173 * @rlimits: rlimits for the profile
175 * The AppArmor profile contains the basic confinement data. Each profile
176 * has a name, and exists in a namespace. The @name and @exec_match are
177 * used to determine profile attachment against unconfined tasks. All other
178 * attachments are determined by profile X transition rules.
180 * The @replacedby struct is write protected by the profile lock.
182 * Profiles have a hierarchy where hats and children profiles keep
183 * a reference to their parent.
185 * Profile names can not begin with a : and can not contain the \0
186 * character. If a profile name begins with / it will be considered when
187 * determining profile attachment on "unconfined" tasks.
190 struct aa_policy base;
193 struct aa_profile __rcu *parent;
195 struct aa_namespace *ns;
196 struct aa_replacedby *replacedby;
199 struct aa_dfa *xmatch;
201 enum audit_mode audit;
202 enum profile_mode mode;
207 struct aa_policydb policy;
208 struct aa_file_rules file;
210 struct aa_rlimit rlimits;
213 extern struct aa_namespace *root_ns;
214 extern enum profile_mode aa_g_profile_mode;
216 void aa_add_profile(struct aa_policy *common, struct aa_profile *profile);
218 bool aa_ns_visible(struct aa_namespace *curr, struct aa_namespace *view);
219 const char *aa_ns_name(struct aa_namespace *parent, struct aa_namespace *child);
220 int aa_alloc_root_ns(void);
221 void aa_free_root_ns(void);
222 void aa_free_namespace_kref(struct kref *kref);
224 struct aa_namespace *aa_find_namespace(struct aa_namespace *root,
228 void aa_free_replacedby_kref(struct kref *kref);
229 struct aa_profile *aa_alloc_profile(const char *name);
230 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat);
231 void aa_free_profile_kref(struct kref *kref);
232 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
233 struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *name);
234 struct aa_profile *aa_match_profile(struct aa_namespace *ns, const char *name);
236 ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace);
237 ssize_t aa_remove_profiles(char *name, size_t size);
240 #define PROF_REPLACE 0
242 #define unconfined(X) ((X)->flags & PFLAG_UNCONFINED)
246 * aa_get_profile - increment refcount on profile @p
247 * @p: profile (MAYBE NULL)
249 * Returns: pointer to @p if @p is NULL will return NULL
250 * Requires: @p must be held with valid refcount when called
252 static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
255 kref_get(&(p->count));
261 * aa_get_profile_not0 - increment refcount on profile @p found via lookup
262 * @p: profile (MAYBE NULL)
264 * Returns: pointer to @p if @p is NULL will return NULL
265 * Requires: @p must be held with valid refcount when called
267 static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p)
269 if (p && kref_get_not0(&p->count))
276 * aa_get_profile_rcu - increment a refcount profile that can be replaced
277 * @p: pointer to profile that can be replaced (NOT NULL)
279 * Returns: pointer to a refcounted profile.
280 * else NULL if no profile
282 static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p)
284 struct aa_profile *c;
288 c = rcu_dereference(*p);
289 } while (c && !kref_get_not0(&c->count));
296 * aa_get_newest_profile - find the newest version of @profile
297 * @profile: the profile to check for newer versions of
299 * Returns: refcounted newest version of @profile taking into account
300 * replacement, renames and removals
303 static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p)
308 if (PROFILE_INVALID(p))
309 return aa_get_profile_rcu(&p->replacedby->profile);
311 return aa_get_profile(p);
315 * aa_put_profile - decrement refcount on profile @p
316 * @p: profile (MAYBE NULL)
318 static inline void aa_put_profile(struct aa_profile *p)
321 kref_put(&p->count, aa_free_profile_kref);
324 static inline struct aa_replacedby *aa_get_replacedby(struct aa_replacedby *p)
327 kref_get(&(p->count));
332 static inline void aa_put_replacedby(struct aa_replacedby *p)
335 kref_put(&p->count, aa_free_replacedby_kref);
338 /* requires profile list write lock held */
339 static inline void __aa_update_replacedby(struct aa_profile *orig,
340 struct aa_profile *new)
342 struct aa_profile *tmp = rcu_dereference(orig->replacedby->profile);
343 rcu_assign_pointer(orig->replacedby->profile, aa_get_profile(new));
344 orig->flags |= PFLAG_INVALID;
349 * aa_get_namespace - increment references count on @ns
350 * @ns: namespace to increment reference count of (MAYBE NULL)
352 * Returns: pointer to @ns, if @ns is NULL returns NULL
353 * Requires: @ns must be held with valid refcount when called
355 static inline struct aa_namespace *aa_get_namespace(struct aa_namespace *ns)
358 aa_get_profile(ns->unconfined);
364 * aa_put_namespace - decrement refcount on @ns
365 * @ns: namespace to put reference of
367 * Decrement reference count of @ns and if no longer in use free it
369 static inline void aa_put_namespace(struct aa_namespace *ns)
372 aa_put_profile(ns->unconfined);
375 static inline int AUDIT_MODE(struct aa_profile *profile)
377 if (aa_g_audit != AUDIT_NORMAL)
380 return profile->audit;
383 bool aa_may_manage_policy(int op);
385 #endif /* __AA_POLICY_H */