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 char default_range; 73 }; 74 75 /* Role attributes */ 76 struct role_datum { 77 u32 value; /* internal role value */ 78 u32 bounds; /* boundary of role */ 79 struct ebitmap dominates; /* set of roles dominated by this role */ 80 struct ebitmap types; /* set of authorized types for role */ 81 }; 82 83 struct role_trans { 84 u32 role; /* current role */ 85 u32 type; /* program executable type, or new object type */ 86 u32 tclass; /* process class, or new object class */ 87 u32 new_role; /* new role */ 88 struct role_trans *next; 89 }; 90 91 struct filename_trans { 92 u32 stype; /* current process */ 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 u32 otype; /* expected of new object */ 100 }; 101 102 struct role_allow { 103 u32 role; /* current role */ 104 u32 new_role; /* new role */ 105 struct role_allow *next; 106 }; 107 108 /* Type attributes */ 109 struct type_datum { 110 u32 value; /* internal type value */ 111 u32 bounds; /* boundary of type */ 112 unsigned char primary; /* primary name? */ 113 unsigned char attribute;/* attribute ?*/ 114 }; 115 116 /* User attributes */ 117 struct user_datum { 118 u32 value; /* internal user value */ 119 u32 bounds; /* bounds of user */ 120 struct ebitmap roles; /* set of authorized roles for user */ 121 struct mls_range range; /* MLS range (min - max) for user */ 122 struct mls_level dfltlevel; /* default login MLS level for user */ 123 }; 124 125 126 /* Sensitivity attributes */ 127 struct level_datum { 128 struct mls_level *level; /* sensitivity and associated categories */ 129 unsigned char isalias; /* is this sensitivity an alias for another? */ 130 }; 131 132 /* Category attributes */ 133 struct cat_datum { 134 u32 value; /* internal category bit + 1 */ 135 unsigned char isalias; /* is this category an alias for another? */ 136 }; 137 138 struct range_trans { 139 u32 source_type; 140 u32 target_type; 141 u32 target_class; 142 }; 143 144 /* Boolean data type */ 145 struct cond_bool_datum { 146 __u32 value; /* internal type value */ 147 int state; 148 }; 149 150 struct cond_node; 151 152 /* 153 * type set preserves data needed to determine constraint info from 154 * policy source. This is not used by the kernel policy but allows 155 * utilities such as audit2allow to determine constraint denials. 156 */ 157 struct type_set { 158 struct ebitmap types; 159 struct ebitmap negset; 160 u32 flags; 161 }; 162 163 /* 164 * The configuration data includes security contexts for 165 * initial SIDs, unlabeled file systems, TCP and UDP port numbers, 166 * network interfaces, and nodes. This structure stores the 167 * relevant data for one such entry. Entries of the same kind 168 * (e.g. all initial SIDs) are linked together into a list. 169 */ 170 struct ocontext { 171 union { 172 char *name; /* name of initial SID, fs, netif, fstype, path */ 173 struct { 174 u8 protocol; 175 u16 low_port; 176 u16 high_port; 177 } port; /* TCP or UDP port information */ 178 struct { 179 u32 addr; 180 u32 mask; 181 } node; /* node information */ 182 struct { 183 u32 addr[4]; 184 u32 mask[4]; 185 } node6; /* IPv6 node information */ 186 struct { 187 u64 subnet_prefix; 188 u16 low_pkey; 189 u16 high_pkey; 190 } ibpkey; 191 struct { 192 char *dev_name; 193 u8 port; 194 } ibendport; 195 } u; 196 union { 197 u32 sclass; /* security class for genfs */ 198 u32 behavior; /* labeling behavior for fs_use */ 199 } v; 200 struct context context[2]; /* security context(s) */ 201 u32 sid[2]; /* SID(s) */ 202 struct ocontext *next; 203 }; 204 205 struct genfs { 206 char *fstype; 207 struct ocontext *head; 208 struct genfs *next; 209 }; 210 211 /* symbol table array indices */ 212 #define SYM_COMMONS 0 213 #define SYM_CLASSES 1 214 #define SYM_ROLES 2 215 #define SYM_TYPES 3 216 #define SYM_USERS 4 217 #define SYM_BOOLS 5 218 #define SYM_LEVELS 6 219 #define SYM_CATS 7 220 #define SYM_NUM 8 221 222 /* object context array indices */ 223 #define OCON_ISID 0 /* initial SIDs */ 224 #define OCON_FS 1 /* unlabeled file systems */ 225 #define OCON_PORT 2 /* TCP and UDP port numbers */ 226 #define OCON_NETIF 3 /* network interfaces */ 227 #define OCON_NODE 4 /* nodes */ 228 #define OCON_FSUSE 5 /* fs_use */ 229 #define OCON_NODE6 6 /* IPv6 nodes */ 230 #define OCON_IBPKEY 7 /* Infiniband PKeys */ 231 #define OCON_IBENDPORT 8 /* Infiniband end ports */ 232 #define OCON_NUM 9 233 234 /* The policy database */ 235 struct policydb { 236 int mls_enabled; 237 238 /* symbol tables */ 239 struct symtab symtab[SYM_NUM]; 240 #define p_commons symtab[SYM_COMMONS] 241 #define p_classes symtab[SYM_CLASSES] 242 #define p_roles symtab[SYM_ROLES] 243 #define p_types symtab[SYM_TYPES] 244 #define p_users symtab[SYM_USERS] 245 #define p_bools symtab[SYM_BOOLS] 246 #define p_levels symtab[SYM_LEVELS] 247 #define p_cats symtab[SYM_CATS] 248 249 /* symbol names indexed by (value - 1) */ 250 char **sym_val_to_name[SYM_NUM]; 251 252 /* class, role, and user attributes indexed by (value - 1) */ 253 struct class_datum **class_val_to_struct; 254 struct role_datum **role_val_to_struct; 255 struct user_datum **user_val_to_struct; 256 struct type_datum **type_val_to_struct_array; 257 258 /* type enforcement access vectors and transitions */ 259 struct avtab te_avtab; 260 261 /* role transitions */ 262 struct role_trans *role_tr; 263 264 /* file transitions with the last path component */ 265 /* quickly exclude lookups when parent ttype has no rules */ 266 struct ebitmap filename_trans_ttypes; 267 /* actual set of filename_trans rules */ 268 struct hashtab *filename_trans; 269 270 /* bools indexed by (value - 1) */ 271 struct cond_bool_datum **bool_val_to_struct; 272 /* type enforcement conditional access vectors and transitions */ 273 struct avtab te_cond_avtab; 274 /* linked list indexing te_cond_avtab by conditional */ 275 struct cond_node *cond_list; 276 277 /* role allows */ 278 struct role_allow *role_allow; 279 280 /* security contexts of initial SIDs, unlabeled file systems, 281 TCP or UDP port numbers, network interfaces and nodes */ 282 struct ocontext *ocontexts[OCON_NUM]; 283 284 /* security contexts for files in filesystems that cannot support 285 a persistent label mapping or use another 286 fixed labeling behavior. */ 287 struct genfs *genfs; 288 289 /* range transitions table (range_trans_key -> mls_range) */ 290 struct hashtab *range_tr; 291 292 /* type -> attribute reverse mapping */ 293 struct ebitmap *type_attr_map_array; 294 295 struct ebitmap policycaps; 296 297 struct ebitmap permissive_map; 298 299 /* length of this policy when it was loaded */ 300 size_t len; 301 302 unsigned int policyvers; 303 304 unsigned int reject_unknown : 1; 305 unsigned int allow_unknown : 1; 306 307 u16 process_class; 308 u32 process_trans_perms; 309 }; 310 311 extern void policydb_destroy(struct policydb *p); 312 extern int policydb_load_isids(struct policydb *p, struct sidtab *s); 313 extern int policydb_context_isvalid(struct policydb *p, struct context *c); 314 extern int policydb_class_isvalid(struct policydb *p, unsigned int class); 315 extern int policydb_type_isvalid(struct policydb *p, unsigned int type); 316 extern int policydb_role_isvalid(struct policydb *p, unsigned int role); 317 extern int policydb_read(struct policydb *p, void *fp); 318 extern int policydb_write(struct policydb *p, void *fp); 319 320 #define PERM_SYMTAB_SIZE 32 321 322 #define POLICYDB_CONFIG_MLS 1 323 324 /* the config flags related to unknown classes/perms are bits 2 and 3 */ 325 #define REJECT_UNKNOWN 0x00000002 326 #define ALLOW_UNKNOWN 0x00000004 327 328 #define OBJECT_R "object_r" 329 #define OBJECT_R_VAL 1 330 331 #define POLICYDB_MAGIC SELINUX_MAGIC 332 #define POLICYDB_STRING "SE Linux" 333 334 struct policy_file { 335 char *data; 336 size_t len; 337 }; 338 339 struct policy_data { 340 struct policydb *p; 341 void *fp; 342 }; 343 344 static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes) 345 { 346 if (bytes > fp->len) 347 return -EINVAL; 348 349 memcpy(buf, fp->data, bytes); 350 fp->data += bytes; 351 fp->len -= bytes; 352 return 0; 353 } 354 355 static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp) 356 { 357 size_t len = bytes * num; 358 359 memcpy(fp->data, buf, len); 360 fp->data += len; 361 fp->len -= len; 362 363 return 0; 364 } 365 366 static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr) 367 { 368 return p->sym_val_to_name[sym_num][element_nr]; 369 } 370 371 extern u16 string_to_security_class(struct policydb *p, const char *name); 372 extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name); 373 374 #endif /* _SS_POLICYDB_H_ */ 375 376