1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * AppArmor security module 4 * 5 * This file contains AppArmor policy definitions. 6 * 7 * Copyright (C) 1998-2008 Novell/SUSE 8 * Copyright 2009-2010 Canonical Ltd. 9 */ 10 11 #ifndef __AA_POLICY_H 12 #define __AA_POLICY_H 13 14 #include <linux/capability.h> 15 #include <linux/cred.h> 16 #include <linux/kref.h> 17 #include <linux/rhashtable.h> 18 #include <linux/sched.h> 19 #include <linux/slab.h> 20 #include <linux/socket.h> 21 22 #include "apparmor.h" 23 #include "audit.h" 24 #include "capability.h" 25 #include "domain.h" 26 #include "file.h" 27 #include "lib.h" 28 #include "label.h" 29 #include "net.h" 30 #include "perms.h" 31 #include "resource.h" 32 33 34 struct aa_ns; 35 36 extern int unprivileged_userns_apparmor_policy; 37 38 extern const char *const aa_profile_mode_names[]; 39 #define APPARMOR_MODE_NAMES_MAX_INDEX 4 40 41 #define PROFILE_MODE(_profile, _mode) \ 42 ((aa_g_profile_mode == (_mode)) || \ 43 ((_profile)->mode == (_mode))) 44 45 #define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN) 46 47 #define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL) 48 49 #define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT) 50 51 #define CHECK_DEBUG1(_profile) ((_profile)->label.flags & FLAG_DEBUG1) 52 53 #define CHECK_DEBUG2(_profile) ((_profile)->label.flags & FLAG_DEBUG2) 54 55 #define profile_is_stale(_profile) (label_is_stale(&(_profile)->label)) 56 57 #define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2) 58 59 /* 60 * FIXME: currently need a clean way to replace and remove profiles as a 61 * set. It should be done at the namespace level. 62 * Either, with a set of profiles loaded at the namespace level or via 63 * a mark and remove marked interface. 64 */ 65 enum profile_mode { 66 APPARMOR_ENFORCE, /* enforce access rules */ 67 APPARMOR_COMPLAIN, /* allow and log access violations */ 68 APPARMOR_KILL, /* kill task on access violation */ 69 APPARMOR_UNCONFINED, /* profile set to unconfined */ 70 }; 71 72 73 /* struct aa_policydb - match engine for a policy 74 * dfa: dfa pattern match 75 * start: set of start states for the different classes of data 76 */ 77 struct aa_policydb { 78 /* Generic policy DFA specific rule types will be subsections of it */ 79 struct aa_dfa *dfa; 80 unsigned int start[AA_CLASS_LAST + 1]; 81 82 }; 83 84 /* struct aa_data - generic data structure 85 * key: name for retrieving this data 86 * size: size of data in bytes 87 * data: binary data 88 * head: reserved for rhashtable 89 */ 90 struct aa_data { 91 char *key; 92 u32 size; 93 char *data; 94 struct rhash_head head; 95 }; 96 97 98 /* struct aa_profile - basic confinement data 99 * @base - base components of the profile (name, refcount, lists, lock ...) 100 * @label - label this profile is an extension of 101 * @parent: parent of profile 102 * @ns: namespace the profile is in 103 * @rename: optional profile name that this profile renamed 104 * @attach: human readable attachment string 105 * @xmatch: optional extended matching for unconfined executables names 106 * @xmatch_len: xmatch prefix len, used to determine xmatch priority 107 * @audit: the auditing mode of the profile 108 * @mode: the enforcement mode of the profile 109 * @path_flags: flags controlling path generation behavior 110 * @disconnected: what to prepend if attach_disconnected is specified 111 * @size: the memory consumed by this profiles rules 112 * @policy: general match rules governing policy 113 * @file: The set of rules governing basic file access and domain transitions 114 * @caps: capabilities for the profile 115 * @rlimits: rlimits for the profile 116 * 117 * @dents: dentries for the profiles file entries in apparmorfs 118 * @dirname: name of the profile dir in apparmorfs 119 * @data: hashtable for free-form policy aa_data 120 * 121 * The AppArmor profile contains the basic confinement data. Each profile 122 * has a name, and exists in a namespace. The @name and @exec_match are 123 * used to determine profile attachment against unconfined tasks. All other 124 * attachments are determined by profile X transition rules. 125 * 126 * Profiles have a hierarchy where hats and children profiles keep 127 * a reference to their parent. 128 * 129 * Profile names can not begin with a : and can not contain the \0 130 * character. If a profile name begins with / it will be considered when 131 * determining profile attachment on "unconfined" tasks. 132 */ 133 struct aa_profile { 134 struct aa_policy base; 135 struct aa_profile __rcu *parent; 136 137 struct aa_ns *ns; 138 const char *rename; 139 140 const char *attach; 141 struct aa_dfa *xmatch; 142 unsigned int xmatch_len; 143 enum audit_mode audit; 144 long mode; 145 u32 path_flags; 146 const char *disconnected; 147 int size; 148 149 struct aa_policydb policy; 150 struct aa_file_rules file; 151 struct aa_caps caps; 152 153 int xattr_count; 154 char **xattrs; 155 156 struct aa_rlimit rlimits; 157 158 int secmark_count; 159 struct aa_secmark *secmark; 160 161 struct aa_loaddata *rawdata; 162 unsigned char *hash; 163 char *dirname; 164 struct dentry *dents[AAFS_PROF_SIZEOF]; 165 struct rhashtable *data; 166 struct aa_label label; 167 }; 168 169 extern enum profile_mode aa_g_profile_mode; 170 171 #define AA_MAY_LOAD_POLICY AA_MAY_APPEND 172 #define AA_MAY_REPLACE_POLICY AA_MAY_WRITE 173 #define AA_MAY_REMOVE_POLICY AA_MAY_DELETE 174 175 #define profiles_ns(P) ((P)->ns) 176 #define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname) 177 178 void aa_add_profile(struct aa_policy *common, struct aa_profile *profile); 179 180 181 void aa_free_proxy_kref(struct kref *kref); 182 struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy, 183 gfp_t gfp); 184 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat, 185 const char *base, gfp_t gfp); 186 void aa_free_profile(struct aa_profile *profile); 187 void aa_free_profile_kref(struct kref *kref); 188 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name); 189 struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, 190 size_t n); 191 struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name); 192 struct aa_profile *aa_fqlookupn_profile(struct aa_label *base, 193 const char *fqname, size_t n); 194 struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name); 195 196 ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label, 197 u32 mask, struct aa_loaddata *udata); 198 ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label, 199 char *name, size_t size); 200 void __aa_profile_list_release(struct list_head *head); 201 202 #define PROF_ADD 1 203 #define PROF_REPLACE 0 204 205 #define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED) 206 207 /** 208 * aa_get_newest_profile - simple wrapper fn to wrap the label version 209 * @p: profile (NOT NULL) 210 * 211 * Returns refcount to newest version of the profile (maybe @p) 212 * 213 * Requires: @p must be held with a valid refcount 214 */ 215 static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p) 216 { 217 return labels_profile(aa_get_newest_label(&p->label)); 218 } 219 220 static inline unsigned int PROFILE_MEDIATES(struct aa_profile *profile, 221 unsigned char class) 222 { 223 if (class <= AA_CLASS_LAST) 224 return profile->policy.start[class]; 225 else 226 return aa_dfa_match_len(profile->policy.dfa, 227 profile->policy.start[0], &class, 1); 228 } 229 230 static inline unsigned int PROFILE_MEDIATES_AF(struct aa_profile *profile, 231 u16 AF) { 232 unsigned int state = PROFILE_MEDIATES(profile, AA_CLASS_NET); 233 __be16 be_af = cpu_to_be16(AF); 234 235 if (!state) 236 return 0; 237 return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2); 238 } 239 240 /** 241 * aa_get_profile - increment refcount on profile @p 242 * @p: profile (MAYBE NULL) 243 * 244 * Returns: pointer to @p if @p is NULL will return NULL 245 * Requires: @p must be held with valid refcount when called 246 */ 247 static inline struct aa_profile *aa_get_profile(struct aa_profile *p) 248 { 249 if (p) 250 kref_get(&(p->label.count)); 251 252 return p; 253 } 254 255 /** 256 * aa_get_profile_not0 - increment refcount on profile @p found via lookup 257 * @p: profile (MAYBE NULL) 258 * 259 * Returns: pointer to @p if @p is NULL will return NULL 260 * Requires: @p must be held with valid refcount when called 261 */ 262 static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p) 263 { 264 if (p && kref_get_unless_zero(&p->label.count)) 265 return p; 266 267 return NULL; 268 } 269 270 /** 271 * aa_get_profile_rcu - increment a refcount profile that can be replaced 272 * @p: pointer to profile that can be replaced (NOT NULL) 273 * 274 * Returns: pointer to a refcounted profile. 275 * else NULL if no profile 276 */ 277 static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p) 278 { 279 struct aa_profile *c; 280 281 rcu_read_lock(); 282 do { 283 c = rcu_dereference(*p); 284 } while (c && !kref_get_unless_zero(&c->label.count)); 285 rcu_read_unlock(); 286 287 return c; 288 } 289 290 /** 291 * aa_put_profile - decrement refcount on profile @p 292 * @p: profile (MAYBE NULL) 293 */ 294 static inline void aa_put_profile(struct aa_profile *p) 295 { 296 if (p) 297 kref_put(&p->label.count, aa_label_kref); 298 } 299 300 static inline int AUDIT_MODE(struct aa_profile *profile) 301 { 302 if (aa_g_audit != AUDIT_NORMAL) 303 return aa_g_audit; 304 305 return profile->audit; 306 } 307 308 bool aa_policy_view_capable(struct aa_label *label, struct aa_ns *ns); 309 bool aa_policy_admin_capable(struct aa_label *label, struct aa_ns *ns); 310 int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns, 311 u32 mask); 312 bool aa_current_policy_view_capable(struct aa_ns *ns); 313 bool aa_current_policy_admin_capable(struct aa_ns *ns); 314 315 #endif /* __AA_POLICY_H */ 316