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c88d4c7b JJ |
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 | ||
2d4cee7e | 32 | extern const char *const profile_mode_names[]; |
c88d4c7b JJ |
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 | */ | |
51 | enum 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 | ||
57 | enum 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 | ||
71 | struct 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 | */ | |
80 | struct 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 | */ | |
94 | struct 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 | */ | |
123 | struct 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 | ||
ad5ff3db JJ |
132 | /* struct aa_policydb - match engine for a policy |
133 | * dfa: dfa pattern match | |
134 | * start: set of start states for the different classes of data | |
135 | */ | |
136 | struct aa_policydb { | |
137 | /* Generic policy DFA specific rule types will be subsections of it */ | |
138 | struct aa_dfa *dfa; | |
139 | unsigned int start[AA_CLASS_LAST + 1]; | |
140 | ||
141 | }; | |
142 | ||
c88d4c7b JJ |
143 | /* struct aa_profile - basic confinement data |
144 | * @base - base components of the profile (name, refcount, lists, lock ...) | |
145 | * @parent: parent of profile | |
146 | * @ns: namespace the profile is in | |
147 | * @replacedby: is set to the profile that replaced this profile | |
148 | * @rename: optional profile name that this profile renamed | |
149 | * @xmatch: optional extended matching for unconfined executables names | |
150 | * @xmatch_len: xmatch prefix len, used to determine xmatch priority | |
151 | * @sid: the unique security id number of this profile | |
152 | * @audit: the auditing mode of the profile | |
153 | * @mode: the enforcement mode of the profile | |
154 | * @flags: flags controlling profile behavior | |
155 | * @path_flags: flags controlling path generation behavior | |
156 | * @size: the memory consumed by this profiles rules | |
ad5ff3db | 157 | * @policy: general match rules governing policy |
c88d4c7b JJ |
158 | * @file: The set of rules governing basic file access and domain transitions |
159 | * @caps: capabilities for the profile | |
160 | * @rlimits: rlimits for the profile | |
161 | * | |
162 | * The AppArmor profile contains the basic confinement data. Each profile | |
163 | * has a name, and exists in a namespace. The @name and @exec_match are | |
164 | * used to determine profile attachment against unconfined tasks. All other | |
165 | * attachments are determined by profile X transition rules. | |
166 | * | |
167 | * The @replacedby field is write protected by the profile lock. Reads | |
168 | * are assumed to be atomic, and are done without locking. | |
169 | * | |
170 | * Profiles have a hierarchy where hats and children profiles keep | |
171 | * a reference to their parent. | |
172 | * | |
173 | * Profile names can not begin with a : and can not contain the \0 | |
174 | * character. If a profile name begins with / it will be considered when | |
175 | * determining profile attachment on "unconfined" tasks. | |
176 | */ | |
177 | struct aa_profile { | |
178 | struct aa_policy base; | |
179 | struct aa_profile *parent; | |
180 | ||
181 | struct aa_namespace *ns; | |
182 | struct aa_profile *replacedby; | |
183 | const char *rename; | |
184 | ||
185 | struct aa_dfa *xmatch; | |
186 | int xmatch_len; | |
187 | u32 sid; | |
188 | enum audit_mode audit; | |
189 | enum profile_mode mode; | |
190 | u32 flags; | |
191 | u32 path_flags; | |
192 | int size; | |
193 | ||
ad5ff3db | 194 | struct aa_policydb policy; |
c88d4c7b JJ |
195 | struct aa_file_rules file; |
196 | struct aa_caps caps; | |
197 | struct aa_rlimit rlimits; | |
198 | }; | |
199 | ||
200 | extern struct aa_namespace *root_ns; | |
201 | extern enum profile_mode aa_g_profile_mode; | |
202 | ||
203 | void aa_add_profile(struct aa_policy *common, struct aa_profile *profile); | |
204 | ||
205 | bool aa_ns_visible(struct aa_namespace *curr, struct aa_namespace *view); | |
206 | const char *aa_ns_name(struct aa_namespace *parent, struct aa_namespace *child); | |
207 | int aa_alloc_root_ns(void); | |
208 | void aa_free_root_ns(void); | |
209 | void aa_free_namespace_kref(struct kref *kref); | |
210 | ||
211 | struct aa_namespace *aa_find_namespace(struct aa_namespace *root, | |
212 | const char *name); | |
213 | ||
214 | static inline struct aa_policy *aa_get_common(struct aa_policy *c) | |
215 | { | |
216 | if (c) | |
217 | kref_get(&c->count); | |
218 | ||
219 | return c; | |
220 | } | |
221 | ||
222 | /** | |
223 | * aa_get_namespace - increment references count on @ns | |
224 | * @ns: namespace to increment reference count of (MAYBE NULL) | |
225 | * | |
226 | * Returns: pointer to @ns, if @ns is NULL returns NULL | |
227 | * Requires: @ns must be held with valid refcount when called | |
228 | */ | |
229 | static inline struct aa_namespace *aa_get_namespace(struct aa_namespace *ns) | |
230 | { | |
231 | if (ns) | |
232 | kref_get(&(ns->base.count)); | |
233 | ||
234 | return ns; | |
235 | } | |
236 | ||
237 | /** | |
238 | * aa_put_namespace - decrement refcount on @ns | |
239 | * @ns: namespace to put reference of | |
240 | * | |
241 | * Decrement reference count of @ns and if no longer in use free it | |
242 | */ | |
243 | static inline void aa_put_namespace(struct aa_namespace *ns) | |
244 | { | |
245 | if (ns) | |
246 | kref_put(&ns->base.count, aa_free_namespace_kref); | |
247 | } | |
248 | ||
249 | struct aa_profile *aa_alloc_profile(const char *name); | |
250 | struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat); | |
251 | void aa_free_profile_kref(struct kref *kref); | |
252 | struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name); | |
253 | struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *name); | |
254 | struct aa_profile *aa_match_profile(struct aa_namespace *ns, const char *name); | |
255 | ||
256 | ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace); | |
257 | ssize_t aa_remove_profiles(char *name, size_t size); | |
258 | ||
259 | #define PROF_ADD 1 | |
260 | #define PROF_REPLACE 0 | |
261 | ||
262 | #define unconfined(X) ((X)->flags & PFLAG_UNCONFINED) | |
263 | ||
264 | /** | |
265 | * aa_newest_version - find the newest version of @profile | |
266 | * @profile: the profile to check for newer versions of (NOT NULL) | |
267 | * | |
268 | * Returns: newest version of @profile, if @profile is the newest version | |
269 | * return @profile. | |
270 | * | |
271 | * NOTE: the profile returned is not refcounted, The refcount on @profile | |
272 | * must be held until the caller decides what to do with the returned newest | |
273 | * version. | |
274 | */ | |
275 | static inline struct aa_profile *aa_newest_version(struct aa_profile *profile) | |
276 | { | |
277 | while (profile->replacedby) | |
278 | profile = profile->replacedby; | |
279 | ||
280 | return profile; | |
281 | } | |
282 | ||
283 | /** | |
284 | * aa_get_profile - increment refcount on profile @p | |
285 | * @p: profile (MAYBE NULL) | |
286 | * | |
287 | * Returns: pointer to @p if @p is NULL will return NULL | |
288 | * Requires: @p must be held with valid refcount when called | |
289 | */ | |
290 | static inline struct aa_profile *aa_get_profile(struct aa_profile *p) | |
291 | { | |
292 | if (p) | |
293 | kref_get(&(p->base.count)); | |
294 | ||
295 | return p; | |
296 | } | |
297 | ||
298 | /** | |
299 | * aa_put_profile - decrement refcount on profile @p | |
300 | * @p: profile (MAYBE NULL) | |
301 | */ | |
302 | static inline void aa_put_profile(struct aa_profile *p) | |
303 | { | |
304 | if (p) | |
305 | kref_put(&p->base.count, aa_free_profile_kref); | |
306 | } | |
307 | ||
308 | static inline int AUDIT_MODE(struct aa_profile *profile) | |
309 | { | |
310 | if (aa_g_audit != AUDIT_NORMAL) | |
311 | return aa_g_audit; | |
312 | ||
313 | return profile->audit; | |
314 | } | |
315 | ||
316 | bool aa_may_manage_policy(int op); | |
317 | ||
318 | #endif /* __AA_POLICY_H */ |