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