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