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/rhashtable.h> 22 #include <linux/sched.h> 23 #include <linux/slab.h> 24 #include <linux/socket.h> 25 26 #include "apparmor.h" 27 #include "audit.h" 28 #include "capability.h" 29 #include "domain.h" 30 #include "file.h" 31 #include "lib.h" 32 #include "label.h" 33 #include "perms.h" 34 #include "resource.h" 35 36 37 struct aa_ns; 38 39 extern int unprivileged_userns_apparmor_policy; 40 41 extern const char *const aa_profile_mode_names[]; 42 #define APPARMOR_MODE_NAMES_MAX_INDEX 4 43 44 #define PROFILE_MODE(_profile, _mode) \ 45 ((aa_g_profile_mode == (_mode)) || \ 46 ((_profile)->mode == (_mode))) 47 48 #define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN) 49 50 #define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL) 51 52 #define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT) 53 54 #define profile_is_stale(_profile) (label_is_stale(&(_profile)->label)) 55 56 #define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2) 57 58 /* 59 * FIXME: currently need a clean way to replace and remove profiles as a 60 * set. It should be done at the namespace level. 61 * Either, with a set of profiles loaded at the namespace level or via 62 * a mark and remove marked interface. 63 */ 64 enum profile_mode { 65 APPARMOR_ENFORCE, /* enforce access rules */ 66 APPARMOR_COMPLAIN, /* allow and log access violations */ 67 APPARMOR_KILL, /* kill task on access violation */ 68 APPARMOR_UNCONFINED, /* profile set to unconfined */ 69 }; 70 71 72 /* struct aa_policydb - match engine for a policy 73 * dfa: dfa pattern match 74 * start: set of start states for the different classes of data 75 */ 76 struct aa_policydb { 77 /* Generic policy DFA specific rule types will be subsections of it */ 78 struct aa_dfa *dfa; 79 unsigned int start[AA_CLASS_LAST + 1]; 80 81 }; 82 83 /* struct aa_data - generic data structure 84 * key: name for retrieving this data 85 * size: size of data in bytes 86 * data: binary data 87 * head: reserved for rhashtable 88 */ 89 struct aa_data { 90 char *key; 91 u32 size; 92 char *data; 93 struct rhash_head head; 94 }; 95 96 97 /* struct aa_profile - basic confinement data 98 * @base - base components of the profile (name, refcount, lists, lock ...) 99 * @label - label this profile is an extension of 100 * @parent: parent of profile 101 * @ns: namespace the profile is in 102 * @rename: optional profile name that this profile renamed 103 * @attach: human readable attachment string 104 * @xmatch: optional extended matching for unconfined executables names 105 * @xmatch_len: xmatch prefix len, used to determine xmatch priority 106 * @audit: the auditing mode of the profile 107 * @mode: the enforcement mode of the profile 108 * @path_flags: flags controlling path generation behavior 109 * @disconnected: what to prepend if attach_disconnected is specified 110 * @size: the memory consumed by this profiles rules 111 * @policy: general match rules governing policy 112 * @file: The set of rules governing basic file access and domain transitions 113 * @caps: capabilities for the profile 114 * @rlimits: rlimits for the profile 115 * 116 * @dents: dentries for the profiles file entries in apparmorfs 117 * @dirname: name of the profile dir in apparmorfs 118 * @data: hashtable for free-form policy aa_data 119 * 120 * The AppArmor profile contains the basic confinement data. Each profile 121 * has a name, and exists in a namespace. The @name and @exec_match are 122 * used to determine profile attachment against unconfined tasks. All other 123 * attachments are determined by profile X transition rules. 124 * 125 * Profiles have a hierarchy where hats and children profiles keep 126 * a reference to their parent. 127 * 128 * Profile names can not begin with a : and can not contain the \0 129 * character. If a profile name begins with / it will be considered when 130 * determining profile attachment on "unconfined" tasks. 131 */ 132 struct aa_profile { 133 struct aa_policy base; 134 struct aa_profile __rcu *parent; 135 136 struct aa_ns *ns; 137 const char *rename; 138 139 const char *attach; 140 struct aa_dfa *xmatch; 141 int xmatch_len; 142 enum audit_mode audit; 143 long mode; 144 u32 path_flags; 145 const char *disconnected; 146 int size; 147 148 struct aa_policydb policy; 149 struct aa_file_rules file; 150 struct aa_caps caps; 151 152 int xattr_count; 153 char **xattrs; 154 155 struct aa_rlimit rlimits; 156 157 struct aa_loaddata *rawdata; 158 unsigned char *hash; 159 char *dirname; 160 struct dentry *dents[AAFS_PROF_SIZEOF]; 161 struct rhashtable *data; 162 struct aa_label label; 163 }; 164 165 extern enum profile_mode aa_g_profile_mode; 166 167 #define AA_MAY_LOAD_POLICY AA_MAY_APPEND 168 #define AA_MAY_REPLACE_POLICY AA_MAY_WRITE 169 #define AA_MAY_REMOVE_POLICY AA_MAY_DELETE 170 171 #define profiles_ns(P) ((P)->ns) 172 #define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname) 173 174 void aa_add_profile(struct aa_policy *common, struct aa_profile *profile); 175 176 177 void aa_free_proxy_kref(struct kref *kref); 178 struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy, 179 gfp_t gfp); 180 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat, 181 const char *base, gfp_t gfp); 182 void aa_free_profile(struct aa_profile *profile); 183 void aa_free_profile_kref(struct kref *kref); 184 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name); 185 struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, 186 size_t n); 187 struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name); 188 struct aa_profile *aa_fqlookupn_profile(struct aa_label *base, 189 const char *fqname, size_t n); 190 struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name); 191 192 ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label, 193 u32 mask, struct aa_loaddata *udata); 194 ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label, 195 char *name, size_t size); 196 void __aa_profile_list_release(struct list_head *head); 197 198 #define PROF_ADD 1 199 #define PROF_REPLACE 0 200 201 #define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED) 202 203 /** 204 * aa_get_newest_profile - simple wrapper fn to wrap the label version 205 * @p: profile (NOT NULL) 206 * 207 * Returns refcount to newest version of the profile (maybe @p) 208 * 209 * Requires: @p must be held with a valid refcount 210 */ 211 static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p) 212 { 213 return labels_profile(aa_get_newest_label(&p->label)); 214 } 215 216 #define PROFILE_MEDIATES(P, T) ((P)->policy.start[(T)]) 217 /* safe version of POLICY_MEDIATES for full range input */ 218 static inline unsigned int PROFILE_MEDIATES_SAFE(struct aa_profile *profile, 219 unsigned char class) 220 { 221 if (profile->policy.dfa) 222 return aa_dfa_match_len(profile->policy.dfa, 223 profile->policy.start[0], &class, 1); 224 return 0; 225 } 226 227 /** 228 * aa_get_profile - increment refcount on profile @p 229 * @p: profile (MAYBE NULL) 230 * 231 * Returns: pointer to @p if @p is NULL will return NULL 232 * Requires: @p must be held with valid refcount when called 233 */ 234 static inline struct aa_profile *aa_get_profile(struct aa_profile *p) 235 { 236 if (p) 237 kref_get(&(p->label.count)); 238 239 return p; 240 } 241 242 /** 243 * aa_get_profile_not0 - increment refcount on profile @p found via lookup 244 * @p: profile (MAYBE NULL) 245 * 246 * Returns: pointer to @p if @p is NULL will return NULL 247 * Requires: @p must be held with valid refcount when called 248 */ 249 static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p) 250 { 251 if (p && kref_get_unless_zero(&p->label.count)) 252 return p; 253 254 return NULL; 255 } 256 257 /** 258 * aa_get_profile_rcu - increment a refcount profile that can be replaced 259 * @p: pointer to profile that can be replaced (NOT NULL) 260 * 261 * Returns: pointer to a refcounted profile. 262 * else NULL if no profile 263 */ 264 static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p) 265 { 266 struct aa_profile *c; 267 268 rcu_read_lock(); 269 do { 270 c = rcu_dereference(*p); 271 } while (c && !kref_get_unless_zero(&c->label.count)); 272 rcu_read_unlock(); 273 274 return c; 275 } 276 277 /** 278 * aa_put_profile - decrement refcount on profile @p 279 * @p: profile (MAYBE NULL) 280 */ 281 static inline void aa_put_profile(struct aa_profile *p) 282 { 283 if (p) 284 kref_put(&p->label.count, aa_label_kref); 285 } 286 287 static inline int AUDIT_MODE(struct aa_profile *profile) 288 { 289 if (aa_g_audit != AUDIT_NORMAL) 290 return aa_g_audit; 291 292 return profile->audit; 293 } 294 295 bool policy_view_capable(struct aa_ns *ns); 296 bool policy_admin_capable(struct aa_ns *ns); 297 int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns, 298 u32 mask); 299 300 #endif /* __AA_POLICY_H */ 301