1 /* 2 * A policy database (policydb) specifies the 3 * configuration data for the security policy. 4 * 5 * Author : Stephen Smalley, <sds@epoch.ncsc.mil> 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 <linux/flex_array.h> 28 29 #include "symtab.h" 30 #include "avtab.h" 31 #include "sidtab.h" 32 #include "ebitmap.h" 33 #include "mls_types.h" 34 #include "context.h" 35 #include "constraint.h" 36 37 /* 38 * A datum type is defined for each kind of symbol 39 * in the configuration data: individual permissions, 40 * common prefixes for access vectors, classes, 41 * users, roles, types, sensitivities, categories, etc. 42 */ 43 44 /* Permission attributes */ 45 struct perm_datum { 46 u32 value; /* permission bit + 1 */ 47 }; 48 49 /* Attributes of a common prefix for access vectors */ 50 struct common_datum { 51 u32 value; /* internal common value */ 52 struct symtab permissions; /* common permissions */ 53 }; 54 55 /* Class attributes */ 56 struct class_datum { 57 u32 value; /* class value */ 58 char *comkey; /* common name */ 59 struct common_datum *comdatum; /* common datum */ 60 struct symtab permissions; /* class-specific permission symbol table */ 61 struct constraint_node *constraints; /* constraints on class permissions */ 62 struct constraint_node *validatetrans; /* special transition rules */ 63 /* Options how a new object user, role, and type should be decided */ 64 #define DEFAULT_SOURCE 1 65 #define DEFAULT_TARGET 2 66 char default_user; 67 char default_role; 68 char default_type; 69 /* Options how a new object range should be decided */ 70 #define DEFAULT_SOURCE_LOW 1 71 #define DEFAULT_SOURCE_HIGH 2 72 #define DEFAULT_SOURCE_LOW_HIGH 3 73 #define DEFAULT_TARGET_LOW 4 74 #define DEFAULT_TARGET_HIGH 5 75 #define DEFAULT_TARGET_LOW_HIGH 6 76 char default_range; 77 }; 78 79 /* Role attributes */ 80 struct role_datum { 81 u32 value; /* internal role value */ 82 u32 bounds; /* boundary of role */ 83 struct ebitmap dominates; /* set of roles dominated by this role */ 84 struct ebitmap types; /* set of authorized types for role */ 85 }; 86 87 struct role_trans { 88 u32 role; /* current role */ 89 u32 type; /* program executable type, or new object type */ 90 u32 tclass; /* process class, or new object class */ 91 u32 new_role; /* new role */ 92 struct role_trans *next; 93 }; 94 95 struct filename_trans { 96 u32 stype; /* current process */ 97 u32 ttype; /* parent dir context */ 98 u16 tclass; /* class of new object */ 99 const char *name; /* last path component */ 100 }; 101 102 struct filename_trans_datum { 103 u32 otype; /* expected of new object */ 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 * The configuration data includes security contexts for 158 * initial SIDs, unlabeled file systems, TCP and UDP port numbers, 159 * network interfaces, and nodes. This structure stores the 160 * relevant data for one such entry. Entries of the same kind 161 * (e.g. all initial SIDs) are linked together into a list. 162 */ 163 struct ocontext { 164 union { 165 char *name; /* name of initial SID, fs, netif, fstype, path */ 166 struct { 167 u8 protocol; 168 u16 low_port; 169 u16 high_port; 170 } port; /* TCP or UDP port information */ 171 struct { 172 u32 addr; 173 u32 mask; 174 } node; /* node information */ 175 struct { 176 u32 addr[4]; 177 u32 mask[4]; 178 } node6; /* IPv6 node information */ 179 } u; 180 union { 181 u32 sclass; /* security class for genfs */ 182 u32 behavior; /* labeling behavior for fs_use */ 183 } v; 184 struct context context[2]; /* security context(s) */ 185 u32 sid[2]; /* SID(s) */ 186 struct ocontext *next; 187 }; 188 189 struct genfs { 190 char *fstype; 191 struct ocontext *head; 192 struct genfs *next; 193 }; 194 195 /* symbol table array indices */ 196 #define SYM_COMMONS 0 197 #define SYM_CLASSES 1 198 #define SYM_ROLES 2 199 #define SYM_TYPES 3 200 #define SYM_USERS 4 201 #define SYM_BOOLS 5 202 #define SYM_LEVELS 6 203 #define SYM_CATS 7 204 #define SYM_NUM 8 205 206 /* object context array indices */ 207 #define OCON_ISID 0 /* initial SIDs */ 208 #define OCON_FS 1 /* unlabeled file systems */ 209 #define OCON_PORT 2 /* TCP and UDP port numbers */ 210 #define OCON_NETIF 3 /* network interfaces */ 211 #define OCON_NODE 4 /* nodes */ 212 #define OCON_FSUSE 5 /* fs_use */ 213 #define OCON_NODE6 6 /* IPv6 nodes */ 214 #define OCON_NUM 7 215 216 /* The policy database */ 217 struct policydb { 218 int mls_enabled; 219 220 /* symbol tables */ 221 struct symtab symtab[SYM_NUM]; 222 #define p_commons symtab[SYM_COMMONS] 223 #define p_classes symtab[SYM_CLASSES] 224 #define p_roles symtab[SYM_ROLES] 225 #define p_types symtab[SYM_TYPES] 226 #define p_users symtab[SYM_USERS] 227 #define p_bools symtab[SYM_BOOLS] 228 #define p_levels symtab[SYM_LEVELS] 229 #define p_cats symtab[SYM_CATS] 230 231 /* symbol names indexed by (value - 1) */ 232 struct flex_array *sym_val_to_name[SYM_NUM]; 233 234 /* class, role, and user attributes indexed by (value - 1) */ 235 struct class_datum **class_val_to_struct; 236 struct role_datum **role_val_to_struct; 237 struct user_datum **user_val_to_struct; 238 struct flex_array *type_val_to_struct_array; 239 240 /* type enforcement access vectors and transitions */ 241 struct avtab te_avtab; 242 243 /* role transitions */ 244 struct role_trans *role_tr; 245 246 /* file transitions with the last path component */ 247 /* quickly exclude lookups when parent ttype has no rules */ 248 struct ebitmap filename_trans_ttypes; 249 /* actual set of filename_trans rules */ 250 struct hashtab *filename_trans; 251 252 /* bools indexed by (value - 1) */ 253 struct cond_bool_datum **bool_val_to_struct; 254 /* type enforcement conditional access vectors and transitions */ 255 struct avtab te_cond_avtab; 256 /* linked list indexing te_cond_avtab by conditional */ 257 struct cond_node *cond_list; 258 259 /* role allows */ 260 struct role_allow *role_allow; 261 262 /* security contexts of initial SIDs, unlabeled file systems, 263 TCP or UDP port numbers, network interfaces and nodes */ 264 struct ocontext *ocontexts[OCON_NUM]; 265 266 /* security contexts for files in filesystems that cannot support 267 a persistent label mapping or use another 268 fixed labeling behavior. */ 269 struct genfs *genfs; 270 271 /* range transitions table (range_trans_key -> mls_range) */ 272 struct hashtab *range_tr; 273 274 /* type -> attribute reverse mapping */ 275 struct flex_array *type_attr_map_array; 276 277 struct ebitmap policycaps; 278 279 struct ebitmap permissive_map; 280 281 /* length of this policy when it was loaded */ 282 size_t len; 283 284 unsigned int policyvers; 285 286 unsigned int reject_unknown : 1; 287 unsigned int allow_unknown : 1; 288 289 u16 process_class; 290 u32 process_trans_perms; 291 }; 292 293 extern void policydb_destroy(struct policydb *p); 294 extern int policydb_load_isids(struct policydb *p, struct sidtab *s); 295 extern int policydb_context_isvalid(struct policydb *p, struct context *c); 296 extern int policydb_class_isvalid(struct policydb *p, unsigned int class); 297 extern int policydb_type_isvalid(struct policydb *p, unsigned int type); 298 extern int policydb_role_isvalid(struct policydb *p, unsigned int role); 299 extern int policydb_read(struct policydb *p, void *fp); 300 extern int policydb_write(struct policydb *p, void *fp); 301 302 #define PERM_SYMTAB_SIZE 32 303 304 #define POLICYDB_CONFIG_MLS 1 305 306 /* the config flags related to unknown classes/perms are bits 2 and 3 */ 307 #define REJECT_UNKNOWN 0x00000002 308 #define ALLOW_UNKNOWN 0x00000004 309 310 #define OBJECT_R "object_r" 311 #define OBJECT_R_VAL 1 312 313 #define POLICYDB_MAGIC SELINUX_MAGIC 314 #define POLICYDB_STRING "SE Linux" 315 316 struct policy_file { 317 char *data; 318 size_t len; 319 }; 320 321 struct policy_data { 322 struct policydb *p; 323 void *fp; 324 }; 325 326 static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes) 327 { 328 if (bytes > fp->len) 329 return -EINVAL; 330 331 memcpy(buf, fp->data, bytes); 332 fp->data += bytes; 333 fp->len -= bytes; 334 return 0; 335 } 336 337 static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp) 338 { 339 size_t len = bytes * num; 340 341 memcpy(fp->data, buf, len); 342 fp->data += len; 343 fp->len -= len; 344 345 return 0; 346 } 347 348 static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr) 349 { 350 struct flex_array *fa = p->sym_val_to_name[sym_num]; 351 352 return flex_array_get_ptr(fa, element_nr); 353 } 354 355 extern u16 string_to_security_class(struct policydb *p, const char *name); 356 extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name); 357 358 #endif /* _SS_POLICYDB_H_ */ 359 360