1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * A policy database (policydb) specifies the 4 * configuration data for the security policy. 5 * 6 * Author : Stephen Smalley, <stephen.smalley.work@gmail.com> 7 */ 8 9 /* 10 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> 11 * Support for enhanced MLS infrastructure. 12 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. 13 * 14 * Updated: Frank Mayer <mayerf@tresys.com> and 15 * Karl MacMillan <kmacmillan@tresys.com> 16 * Added conditional policy language extensions 17 * Copyright (C) 2003-2004 Tresys Technology, LLC 18 */ 19 20 #ifndef _SS_POLICYDB_H_ 21 #define _SS_POLICYDB_H_ 22 23 #include "symtab.h" 24 #include "avtab.h" 25 #include "sidtab.h" 26 #include "ebitmap.h" 27 #include "mls_types.h" 28 #include "context.h" 29 #include "constraint.h" 30 31 /* 32 * A datum type is defined for each kind of symbol 33 * in the configuration data: individual permissions, 34 * common prefixes for access vectors, classes, 35 * users, roles, types, sensitivities, categories, etc. 36 */ 37 38 /* Permission attributes */ 39 struct perm_datum { 40 u32 value; /* permission bit + 1 */ 41 }; 42 43 /* Attributes of a common prefix for access vectors */ 44 struct common_datum { 45 u32 value; /* internal common value */ 46 struct symtab permissions; /* common permissions */ 47 }; 48 49 /* Class attributes */ 50 struct class_datum { 51 u32 value; /* class value */ 52 char *comkey; /* common name */ 53 struct common_datum *comdatum; /* common datum */ 54 struct symtab permissions; /* class-specific permission symbol table */ 55 struct constraint_node *constraints; /* constraints on class perms */ 56 struct constraint_node *validatetrans; /* special transition rules */ 57 /* Options how a new object user, role, and type should be decided */ 58 #define DEFAULT_SOURCE 1 59 #define DEFAULT_TARGET 2 60 char default_user; 61 char default_role; 62 char default_type; 63 /* Options how a new object range should be decided */ 64 #define DEFAULT_SOURCE_LOW 1 65 #define DEFAULT_SOURCE_HIGH 2 66 #define DEFAULT_SOURCE_LOW_HIGH 3 67 #define DEFAULT_TARGET_LOW 4 68 #define DEFAULT_TARGET_HIGH 5 69 #define DEFAULT_TARGET_LOW_HIGH 6 70 #define DEFAULT_GLBLUB 7 71 char default_range; 72 }; 73 74 /* Role attributes */ 75 struct role_datum { 76 u32 value; /* internal role value */ 77 u32 bounds; /* boundary of role */ 78 struct ebitmap dominates; /* set of roles dominated by this role */ 79 struct ebitmap types; /* set of authorized types for role */ 80 }; 81 82 struct role_trans_key { 83 u32 role; /* current role */ 84 u32 type; /* program executable type, or new object type */ 85 u32 tclass; /* process class, or new object class */ 86 }; 87 88 struct role_trans_datum { 89 u32 new_role; /* new role */ 90 }; 91 92 struct filename_trans_key { 93 u32 ttype; /* parent dir context */ 94 u16 tclass; /* class of new object */ 95 const char *name; /* last path component */ 96 }; 97 98 struct filename_trans_datum { 99 struct ebitmap stypes; /* bitmap of source types for this otype */ 100 u32 otype; /* resulting type of new object */ 101 struct filename_trans_datum *next; /* record for next otype*/ 102 }; 103 104 struct role_allow { 105 u32 role; /* current role */ 106 u32 new_role; /* new role */ 107 struct role_allow *next; 108 }; 109 110 /* Type attributes */ 111 struct type_datum { 112 u32 value; /* internal type value */ 113 u32 bounds; /* boundary of type */ 114 unsigned char primary; /* primary name? */ 115 unsigned char attribute; /* attribute ?*/ 116 }; 117 118 /* User attributes */ 119 struct user_datum { 120 u32 value; /* internal user value */ 121 u32 bounds; /* bounds of user */ 122 struct ebitmap roles; /* set of authorized roles for user */ 123 struct mls_range range; /* MLS range (min - max) for user */ 124 struct mls_level dfltlevel; /* default login MLS level for user */ 125 }; 126 127 /* Sensitivity attributes */ 128 struct level_datum { 129 struct mls_level *level; /* sensitivity and associated categories */ 130 unsigned char isalias; /* is this sensitivity an alias for another? */ 131 }; 132 133 /* Category attributes */ 134 struct cat_datum { 135 u32 value; /* internal category bit + 1 */ 136 unsigned char isalias; /* is this category an alias for another? */ 137 }; 138 139 struct range_trans { 140 u32 source_type; 141 u32 target_type; 142 u32 target_class; 143 }; 144 145 /* Boolean data type */ 146 struct cond_bool_datum { 147 __u32 value; /* internal type value */ 148 int state; 149 }; 150 151 struct cond_node; 152 153 /* 154 * type set preserves data needed to determine constraint info from 155 * policy source. This is not used by the kernel policy but allows 156 * utilities such as audit2allow to determine constraint denials. 157 */ 158 struct type_set { 159 struct ebitmap types; 160 struct ebitmap negset; 161 u32 flags; 162 }; 163 164 /* 165 * The configuration data includes security contexts for 166 * initial SIDs, unlabeled file systems, TCP and UDP port numbers, 167 * network interfaces, and nodes. This structure stores the 168 * relevant data for one such entry. Entries of the same kind 169 * (e.g. all initial SIDs) are linked together into a list. 170 */ 171 struct ocontext { 172 union { 173 char *name; /* name of initial SID, fs, netif, fstype, path */ 174 struct { 175 u8 protocol; 176 u16 low_port; 177 u16 high_port; 178 } port; /* TCP or UDP port information */ 179 struct { 180 u32 addr; 181 u32 mask; 182 } node; /* node information */ 183 struct { 184 u32 addr[4]; 185 u32 mask[4]; 186 } node6; /* IPv6 node information */ 187 struct { 188 u64 subnet_prefix; 189 u16 low_pkey; 190 u16 high_pkey; 191 } ibpkey; 192 struct { 193 char *dev_name; 194 u8 port; 195 } ibendport; 196 } u; 197 union { 198 u32 sclass; /* security class for genfs */ 199 u32 behavior; /* labeling behavior for fs_use */ 200 } v; 201 struct context context[2]; /* security context(s) */ 202 u32 sid[2]; /* SID(s) */ 203 struct ocontext *next; 204 }; 205 206 struct genfs { 207 char *fstype; 208 struct ocontext *head; 209 struct genfs *next; 210 }; 211 212 /* symbol table array indices */ 213 #define SYM_COMMONS 0 214 #define SYM_CLASSES 1 215 #define SYM_ROLES 2 216 #define SYM_TYPES 3 217 #define SYM_USERS 4 218 #define SYM_BOOLS 5 219 #define SYM_LEVELS 6 220 #define SYM_CATS 7 221 #define SYM_NUM 8 222 223 /* object context array indices */ 224 #define OCON_ISID 0 /* initial SIDs */ 225 #define OCON_FS 1 /* unlabeled file systems (deprecated) */ 226 #define OCON_PORT 2 /* TCP and UDP port numbers */ 227 #define OCON_NETIF 3 /* network interfaces */ 228 #define OCON_NODE 4 /* nodes */ 229 #define OCON_FSUSE 5 /* fs_use */ 230 #define OCON_NODE6 6 /* IPv6 nodes */ 231 #define OCON_IBPKEY 7 /* Infiniband PKeys */ 232 #define OCON_IBENDPORT 8 /* Infiniband end ports */ 233 #define OCON_NUM 9 234 235 /* The policy database */ 236 struct policydb { 237 int mls_enabled; 238 239 /* symbol tables */ 240 struct symtab symtab[SYM_NUM]; 241 #define p_commons symtab[SYM_COMMONS] 242 #define p_classes symtab[SYM_CLASSES] 243 #define p_roles symtab[SYM_ROLES] 244 #define p_types symtab[SYM_TYPES] 245 #define p_users symtab[SYM_USERS] 246 #define p_bools symtab[SYM_BOOLS] 247 #define p_levels symtab[SYM_LEVELS] 248 #define p_cats symtab[SYM_CATS] 249 250 /* symbol names indexed by (value - 1) */ 251 char **sym_val_to_name[SYM_NUM]; 252 253 /* class, role, and user attributes indexed by (value - 1) */ 254 struct class_datum **class_val_to_struct; 255 struct role_datum **role_val_to_struct; 256 struct user_datum **user_val_to_struct; 257 struct type_datum **type_val_to_struct; 258 259 /* type enforcement access vectors and transitions */ 260 struct avtab te_avtab; 261 262 /* role transitions */ 263 struct hashtab role_tr; 264 265 /* file transitions with the last path component */ 266 /* quickly exclude lookups when parent ttype has no rules */ 267 struct ebitmap filename_trans_ttypes; 268 /* actual set of filename_trans rules */ 269 struct hashtab filename_trans; 270 /* only used if policyvers < POLICYDB_VERSION_COMP_FTRANS */ 271 u32 compat_filename_trans_count; 272 273 /* bools indexed by (value - 1) */ 274 struct cond_bool_datum **bool_val_to_struct; 275 /* type enforcement conditional access vectors and transitions */ 276 struct avtab te_cond_avtab; 277 /* array indexing te_cond_avtab by conditional */ 278 struct cond_node *cond_list; 279 u32 cond_list_len; 280 281 /* role allows */ 282 struct role_allow *role_allow; 283 284 /* security contexts of initial SIDs, unlabeled file systems, 285 TCP or UDP port numbers, network interfaces and nodes */ 286 struct ocontext *ocontexts[OCON_NUM]; 287 288 /* security contexts for files in filesystems that cannot support 289 a persistent label mapping or use another 290 fixed labeling behavior. */ 291 struct genfs *genfs; 292 293 /* range transitions table (range_trans_key -> mls_range) */ 294 struct hashtab range_tr; 295 296 /* type -> attribute reverse mapping */ 297 struct ebitmap *type_attr_map_array; 298 299 struct ebitmap policycaps; 300 301 struct ebitmap permissive_map; 302 303 /* length of this policy when it was loaded */ 304 size_t len; 305 306 unsigned int policyvers; 307 308 unsigned int reject_unknown : 1; 309 unsigned int allow_unknown : 1; 310 311 u16 process_class; 312 u32 process_trans_perms; 313 } __randomize_layout; 314 315 extern void policydb_destroy(struct policydb *p); 316 extern int policydb_load_isids(struct policydb *p, struct sidtab *s); 317 extern int policydb_context_isvalid(struct policydb *p, struct context *c); 318 extern int policydb_class_isvalid(struct policydb *p, unsigned int class); 319 extern int policydb_type_isvalid(struct policydb *p, unsigned int type); 320 extern int policydb_role_isvalid(struct policydb *p, unsigned int role); 321 extern int policydb_read(struct policydb *p, void *fp); 322 extern int policydb_write(struct policydb *p, void *fp); 323 324 extern struct filename_trans_datum * 325 policydb_filenametr_search(struct policydb *p, struct filename_trans_key *key); 326 327 extern struct mls_range *policydb_rangetr_search(struct policydb *p, 328 struct range_trans *key); 329 330 extern struct role_trans_datum * 331 policydb_roletr_search(struct policydb *p, struct role_trans_key *key); 332 333 #define POLICYDB_CONFIG_MLS 1 334 335 /* the config flags related to unknown classes/perms are bits 2 and 3 */ 336 #define REJECT_UNKNOWN 0x00000002 337 #define ALLOW_UNKNOWN 0x00000004 338 339 #define OBJECT_R "object_r" 340 #define OBJECT_R_VAL 1 341 342 #define POLICYDB_MAGIC SELINUX_MAGIC 343 #define POLICYDB_STRING "SE Linux" 344 345 struct policy_file { 346 char *data; 347 size_t len; 348 }; 349 350 struct policy_data { 351 struct policydb *p; 352 void *fp; 353 }; 354 next_entry(void * buf,struct policy_file * fp,size_t bytes)355 static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes) 356 { 357 if (bytes > fp->len) 358 return -EINVAL; 359 360 memcpy(buf, fp->data, bytes); 361 fp->data += bytes; 362 fp->len -= bytes; 363 return 0; 364 } 365 put_entry(const void * buf,size_t bytes,size_t num,struct policy_file * fp)366 static inline int put_entry(const void *buf, size_t bytes, size_t num, 367 struct policy_file *fp) 368 { 369 size_t len; 370 371 if (unlikely(check_mul_overflow(bytes, num, &len))) 372 return -EINVAL; 373 374 if (len > fp->len) 375 return -EINVAL; 376 memcpy(fp->data, buf, len); 377 fp->data += len; 378 fp->len -= len; 379 380 return 0; 381 } 382 sym_name(struct policydb * p,unsigned int sym_num,unsigned int element_nr)383 static inline char *sym_name(struct policydb *p, unsigned int sym_num, 384 unsigned int element_nr) 385 { 386 return p->sym_val_to_name[sym_num][element_nr]; 387 } 388 389 extern u16 string_to_security_class(struct policydb *p, const char *name); 390 extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name); 391 392 #endif /* _SS_POLICYDB_H_ */ 393