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1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor policy definitions.
5 *
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
12 * License.
13 */
14
15#ifndef __AA_POLICY_H
16#define __AA_POLICY_H
17
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>
24
25#include "apparmor.h"
26#include "audit.h"
27#include "capability.h"
28#include "domain.h"
29#include "file.h"
30#include "resource.h"
31
32extern const char *profile_mode_names[];
33#define APPARMOR_NAMES_MAX_INDEX 3
34
35#define COMPLAIN_MODE(_profile) \
36 ((aa_g_profile_mode == APPARMOR_COMPLAIN) || \
37 ((_profile)->mode == APPARMOR_COMPLAIN))
38
39#define KILL_MODE(_profile) \
40 ((aa_g_profile_mode == APPARMOR_KILL) || \
41 ((_profile)->mode == APPARMOR_KILL))
42
43#define PROFILE_IS_HAT(_profile) ((_profile)->flags & PFLAG_HAT)
44
45/*
46 * FIXME: currently need a clean way to replace and remove profiles as a
47 * set. It should be done at the namespace level.
48 * Either, with a set of profiles loaded at the namespace level or via
49 * a mark and remove marked interface.
50 */
51enum profile_mode {
52 APPARMOR_ENFORCE, /* enforce access rules */
53 APPARMOR_COMPLAIN, /* allow and log access violations */
54 APPARMOR_KILL, /* kill task on access violation */
55};
56
57enum profile_flags {
58 PFLAG_HAT = 1, /* profile is a hat */
59 PFLAG_UNCONFINED = 2, /* profile is an unconfined profile */
60 PFLAG_NULL = 4, /* profile is null learning profile */
61 PFLAG_IX_ON_NAME_ERROR = 8, /* fallback to ix on name lookup fail */
62 PFLAG_IMMUTABLE = 0x10, /* don't allow changes/replacement */
63 PFLAG_USER_DEFINED = 0x20, /* user based profile - lower privs */
64 PFLAG_NO_LIST_REF = 0x40, /* list doesn't keep profile ref */
65 PFLAG_OLD_NULL_TRANS = 0x100, /* use // as the null transition */
66
67 /* These flags must correspond with PATH_flags */
68 PFLAG_MEDIATE_DELETED = 0x10000, /* mediate instead delegate deleted */
69};
70
71struct aa_profile;
72
73/* struct aa_policy - common part of both namespaces and profiles
74 * @name: name of the object
75 * @hname - The hierarchical name
76 * @count: reference count of the obj
77 * @list: list policy object is on
78 * @profiles: head of the profiles list contained in the object
79 */
80struct aa_policy {
81 char *name;
82 char *hname;
83 struct kref count;
84 struct list_head list;
85 struct list_head profiles;
86};
87
88/* struct aa_ns_acct - accounting of profiles in namespace
89 * @max_size: maximum space allowed for all profiles in namespace
90 * @max_count: maximum number of profiles that can be in this namespace
91 * @size: current size of profiles
92 * @count: current count of profiles (includes null profiles)
93 */
94struct aa_ns_acct {
95 int max_size;
96 int max_count;
97 int size;
98 int count;
99};
100
101/* struct aa_namespace - namespace for a set of profiles
102 * @base: common policy
103 * @parent: parent of namespace
104 * @lock: lock for modifying the object
105 * @acct: accounting for the namespace
106 * @unconfined: special unconfined profile for the namespace
107 * @sub_ns: list of namespaces under the current namespace.
108 *
109 * An aa_namespace defines the set profiles that are searched to determine
110 * which profile to attach to a task. Profiles can not be shared between
111 * aa_namespaces and profile names within a namespace are guaranteed to be
112 * unique. When profiles in separate namespaces have the same name they
113 * are NOT considered to be equivalent.
114 *
115 * Namespaces are hierarchical and only namespaces and profiles below the
116 * current namespace are visible.
117 *
118 * Namespace names must be unique and can not contain the characters :/\0
119 *
120 * FIXME TODO: add vserver support of namespaces (can it all be done in
121 * userspace?)
122 */
123struct aa_namespace {
124 struct aa_policy base;
125 struct aa_namespace *parent;
126 rwlock_t lock;
127 struct aa_ns_acct acct;
128 struct aa_profile *unconfined;
129 struct list_head sub_ns;
130};
131
132/* struct aa_profile - basic confinement data
133 * @base - base components of the profile (name, refcount, lists, lock ...)
134 * @parent: parent of profile
135 * @ns: namespace the profile is in
136 * @replacedby: is set to the profile that replaced this profile
137 * @rename: optional profile name that this profile renamed
138 * @xmatch: optional extended matching for unconfined executables names
139 * @xmatch_len: xmatch prefix len, used to determine xmatch priority
140 * @sid: the unique security id number of this profile
141 * @audit: the auditing mode of the profile
142 * @mode: the enforcement mode of the profile
143 * @flags: flags controlling profile behavior
144 * @path_flags: flags controlling path generation behavior
145 * @size: the memory consumed by this profiles rules
146 * @file: The set of rules governing basic file access and domain transitions
147 * @caps: capabilities for the profile
148 * @rlimits: rlimits for the profile
149 *
150 * The AppArmor profile contains the basic confinement data. Each profile
151 * has a name, and exists in a namespace. The @name and @exec_match are
152 * used to determine profile attachment against unconfined tasks. All other
153 * attachments are determined by profile X transition rules.
154 *
155 * The @replacedby field is write protected by the profile lock. Reads
156 * are assumed to be atomic, and are done without locking.
157 *
158 * Profiles have a hierarchy where hats and children profiles keep
159 * a reference to their parent.
160 *
161 * Profile names can not begin with a : and can not contain the \0
162 * character. If a profile name begins with / it will be considered when
163 * determining profile attachment on "unconfined" tasks.
164 */
165struct aa_profile {
166 struct aa_policy base;
167 struct aa_profile *parent;
168
169 struct aa_namespace *ns;
170 struct aa_profile *replacedby;
171 const char *rename;
172
173 struct aa_dfa *xmatch;
174 int xmatch_len;
175 u32 sid;
176 enum audit_mode audit;
177 enum profile_mode mode;
178 u32 flags;
179 u32 path_flags;
180 int size;
181
182 struct aa_file_rules file;
183 struct aa_caps caps;
184 struct aa_rlimit rlimits;
185};
186
187extern struct aa_namespace *root_ns;
188extern enum profile_mode aa_g_profile_mode;
189
190void aa_add_profile(struct aa_policy *common, struct aa_profile *profile);
191
192bool aa_ns_visible(struct aa_namespace *curr, struct aa_namespace *view);
193const char *aa_ns_name(struct aa_namespace *parent, struct aa_namespace *child);
194int aa_alloc_root_ns(void);
195void aa_free_root_ns(void);
196void aa_free_namespace_kref(struct kref *kref);
197
198struct aa_namespace *aa_find_namespace(struct aa_namespace *root,
199 const char *name);
200
201static inline struct aa_policy *aa_get_common(struct aa_policy *c)
202{
203 if (c)
204 kref_get(&c->count);
205
206 return c;
207}
208
209/**
210 * aa_get_namespace - increment references count on @ns
211 * @ns: namespace to increment reference count of (MAYBE NULL)
212 *
213 * Returns: pointer to @ns, if @ns is NULL returns NULL
214 * Requires: @ns must be held with valid refcount when called
215 */
216static inline struct aa_namespace *aa_get_namespace(struct aa_namespace *ns)
217{
218 if (ns)
219 kref_get(&(ns->base.count));
220
221 return ns;
222}
223
224/**
225 * aa_put_namespace - decrement refcount on @ns
226 * @ns: namespace to put reference of
227 *
228 * Decrement reference count of @ns and if no longer in use free it
229 */
230static inline void aa_put_namespace(struct aa_namespace *ns)
231{
232 if (ns)
233 kref_put(&ns->base.count, aa_free_namespace_kref);
234}
235
236struct aa_profile *aa_alloc_profile(const char *name);
237struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat);
238void aa_free_profile_kref(struct kref *kref);
239struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
240struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *name);
241struct aa_profile *aa_match_profile(struct aa_namespace *ns, const char *name);
242
243ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace);
244ssize_t aa_remove_profiles(char *name, size_t size);
245
246#define PROF_ADD 1
247#define PROF_REPLACE 0
248
249#define unconfined(X) ((X)->flags & PFLAG_UNCONFINED)
250
251/**
252 * aa_newest_version - find the newest version of @profile
253 * @profile: the profile to check for newer versions of (NOT NULL)
254 *
255 * Returns: newest version of @profile, if @profile is the newest version
256 * return @profile.
257 *
258 * NOTE: the profile returned is not refcounted, The refcount on @profile
259 * must be held until the caller decides what to do with the returned newest
260 * version.
261 */
262static inline struct aa_profile *aa_newest_version(struct aa_profile *profile)
263{
264 while (profile->replacedby)
265 profile = profile->replacedby;
266
267 return profile;
268}
269
270/**
271 * aa_get_profile - increment refcount on profile @p
272 * @p: profile (MAYBE NULL)
273 *
274 * Returns: pointer to @p if @p is NULL will return NULL
275 * Requires: @p must be held with valid refcount when called
276 */
277static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
278{
279 if (p)
280 kref_get(&(p->base.count));
281
282 return p;
283}
284
285/**
286 * aa_put_profile - decrement refcount on profile @p
287 * @p: profile (MAYBE NULL)
288 */
289static inline void aa_put_profile(struct aa_profile *p)
290{
291 if (p)
292 kref_put(&p->base.count, aa_free_profile_kref);
293}
294
295static inline int AUDIT_MODE(struct aa_profile *profile)
296{
297 if (aa_g_audit != AUDIT_NORMAL)
298 return aa_g_audit;
299
300 return profile->audit;
301}
302
303bool aa_may_manage_policy(int op);
304
305#endif /* __AA_POLICY_H */