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 }; 64 65 /* Role attributes */ 66 struct role_datum { 67 u32 value; /* internal role value */ 68 u32 bounds; /* boundary of role */ 69 struct ebitmap dominates; /* set of roles dominated by this role */ 70 struct ebitmap types; /* set of authorized types for role */ 71 }; 72 73 struct role_trans { 74 u32 role; /* current role */ 75 u32 type; /* program executable type, or new object type */ 76 u32 tclass; /* process class, or new object class */ 77 u32 new_role; /* new role */ 78 struct role_trans *next; 79 }; 80 81 struct filename_trans { 82 u32 stype; /* current process */ 83 u32 ttype; /* parent dir context */ 84 u16 tclass; /* class of new object */ 85 const char *name; /* last path component */ 86 }; 87 88 struct filename_trans_datum { 89 u32 otype; /* expected of new object */ 90 }; 91 92 struct role_allow { 93 u32 role; /* current role */ 94 u32 new_role; /* new role */ 95 struct role_allow *next; 96 }; 97 98 /* Type attributes */ 99 struct type_datum { 100 u32 value; /* internal type value */ 101 u32 bounds; /* boundary of type */ 102 unsigned char primary; /* primary name? */ 103 unsigned char attribute;/* attribute ?*/ 104 }; 105 106 /* User attributes */ 107 struct user_datum { 108 u32 value; /* internal user value */ 109 u32 bounds; /* bounds of user */ 110 struct ebitmap roles; /* set of authorized roles for user */ 111 struct mls_range range; /* MLS range (min - max) for user */ 112 struct mls_level dfltlevel; /* default login MLS level for user */ 113 }; 114 115 116 /* Sensitivity attributes */ 117 struct level_datum { 118 struct mls_level *level; /* sensitivity and associated categories */ 119 unsigned char isalias; /* is this sensitivity an alias for another? */ 120 }; 121 122 /* Category attributes */ 123 struct cat_datum { 124 u32 value; /* internal category bit + 1 */ 125 unsigned char isalias; /* is this category an alias for another? */ 126 }; 127 128 struct range_trans { 129 u32 source_type; 130 u32 target_type; 131 u32 target_class; 132 }; 133 134 /* Boolean data type */ 135 struct cond_bool_datum { 136 __u32 value; /* internal type value */ 137 int state; 138 }; 139 140 struct cond_node; 141 142 /* 143 * The configuration data includes security contexts for 144 * initial SIDs, unlabeled file systems, TCP and UDP port numbers, 145 * network interfaces, and nodes. This structure stores the 146 * relevant data for one such entry. Entries of the same kind 147 * (e.g. all initial SIDs) are linked together into a list. 148 */ 149 struct ocontext { 150 union { 151 char *name; /* name of initial SID, fs, netif, fstype, path */ 152 struct { 153 u8 protocol; 154 u16 low_port; 155 u16 high_port; 156 } port; /* TCP or UDP port information */ 157 struct { 158 u32 addr; 159 u32 mask; 160 } node; /* node information */ 161 struct { 162 u32 addr[4]; 163 u32 mask[4]; 164 } node6; /* IPv6 node information */ 165 } u; 166 union { 167 u32 sclass; /* security class for genfs */ 168 u32 behavior; /* labeling behavior for fs_use */ 169 } v; 170 struct context context[2]; /* security context(s) */ 171 u32 sid[2]; /* SID(s) */ 172 struct ocontext *next; 173 }; 174 175 struct genfs { 176 char *fstype; 177 struct ocontext *head; 178 struct genfs *next; 179 }; 180 181 /* symbol table array indices */ 182 #define SYM_COMMONS 0 183 #define SYM_CLASSES 1 184 #define SYM_ROLES 2 185 #define SYM_TYPES 3 186 #define SYM_USERS 4 187 #define SYM_BOOLS 5 188 #define SYM_LEVELS 6 189 #define SYM_CATS 7 190 #define SYM_NUM 8 191 192 /* object context array indices */ 193 #define OCON_ISID 0 /* initial SIDs */ 194 #define OCON_FS 1 /* unlabeled file systems */ 195 #define OCON_PORT 2 /* TCP and UDP port numbers */ 196 #define OCON_NETIF 3 /* network interfaces */ 197 #define OCON_NODE 4 /* nodes */ 198 #define OCON_FSUSE 5 /* fs_use */ 199 #define OCON_NODE6 6 /* IPv6 nodes */ 200 #define OCON_NUM 7 201 202 /* The policy database */ 203 struct policydb { 204 int mls_enabled; 205 206 /* symbol tables */ 207 struct symtab symtab[SYM_NUM]; 208 #define p_commons symtab[SYM_COMMONS] 209 #define p_classes symtab[SYM_CLASSES] 210 #define p_roles symtab[SYM_ROLES] 211 #define p_types symtab[SYM_TYPES] 212 #define p_users symtab[SYM_USERS] 213 #define p_bools symtab[SYM_BOOLS] 214 #define p_levels symtab[SYM_LEVELS] 215 #define p_cats symtab[SYM_CATS] 216 217 /* symbol names indexed by (value - 1) */ 218 struct flex_array *sym_val_to_name[SYM_NUM]; 219 220 /* class, role, and user attributes indexed by (value - 1) */ 221 struct class_datum **class_val_to_struct; 222 struct role_datum **role_val_to_struct; 223 struct user_datum **user_val_to_struct; 224 struct flex_array *type_val_to_struct_array; 225 226 /* type enforcement access vectors and transitions */ 227 struct avtab te_avtab; 228 229 /* role transitions */ 230 struct role_trans *role_tr; 231 232 /* file transitions with the last path component */ 233 /* quickly exclude lookups when parent ttype has no rules */ 234 struct ebitmap filename_trans_ttypes; 235 /* actual set of filename_trans rules */ 236 struct hashtab *filename_trans; 237 238 /* bools indexed by (value - 1) */ 239 struct cond_bool_datum **bool_val_to_struct; 240 /* type enforcement conditional access vectors and transitions */ 241 struct avtab te_cond_avtab; 242 /* linked list indexing te_cond_avtab by conditional */ 243 struct cond_node *cond_list; 244 245 /* role allows */ 246 struct role_allow *role_allow; 247 248 /* security contexts of initial SIDs, unlabeled file systems, 249 TCP or UDP port numbers, network interfaces and nodes */ 250 struct ocontext *ocontexts[OCON_NUM]; 251 252 /* security contexts for files in filesystems that cannot support 253 a persistent label mapping or use another 254 fixed labeling behavior. */ 255 struct genfs *genfs; 256 257 /* range transitions table (range_trans_key -> mls_range) */ 258 struct hashtab *range_tr; 259 260 /* type -> attribute reverse mapping */ 261 struct flex_array *type_attr_map_array; 262 263 struct ebitmap policycaps; 264 265 struct ebitmap permissive_map; 266 267 /* length of this policy when it was loaded */ 268 size_t len; 269 270 unsigned int policyvers; 271 272 unsigned int reject_unknown : 1; 273 unsigned int allow_unknown : 1; 274 275 u16 process_class; 276 u32 process_trans_perms; 277 }; 278 279 extern void policydb_destroy(struct policydb *p); 280 extern int policydb_load_isids(struct policydb *p, struct sidtab *s); 281 extern int policydb_context_isvalid(struct policydb *p, struct context *c); 282 extern int policydb_class_isvalid(struct policydb *p, unsigned int class); 283 extern int policydb_type_isvalid(struct policydb *p, unsigned int type); 284 extern int policydb_role_isvalid(struct policydb *p, unsigned int role); 285 extern int policydb_read(struct policydb *p, void *fp); 286 extern int policydb_write(struct policydb *p, void *fp); 287 288 #define PERM_SYMTAB_SIZE 32 289 290 #define POLICYDB_CONFIG_MLS 1 291 292 /* the config flags related to unknown classes/perms are bits 2 and 3 */ 293 #define REJECT_UNKNOWN 0x00000002 294 #define ALLOW_UNKNOWN 0x00000004 295 296 #define OBJECT_R "object_r" 297 #define OBJECT_R_VAL 1 298 299 #define POLICYDB_MAGIC SELINUX_MAGIC 300 #define POLICYDB_STRING "SE Linux" 301 302 struct policy_file { 303 char *data; 304 size_t len; 305 }; 306 307 struct policy_data { 308 struct policydb *p; 309 void *fp; 310 }; 311 312 static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes) 313 { 314 if (bytes > fp->len) 315 return -EINVAL; 316 317 memcpy(buf, fp->data, bytes); 318 fp->data += bytes; 319 fp->len -= bytes; 320 return 0; 321 } 322 323 static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp) 324 { 325 size_t len = bytes * num; 326 327 memcpy(fp->data, buf, len); 328 fp->data += len; 329 fp->len -= len; 330 331 return 0; 332 } 333 334 static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr) 335 { 336 struct flex_array *fa = p->sym_val_to_name[sym_num]; 337 338 return flex_array_get_ptr(fa, element_nr); 339 } 340 341 extern u16 string_to_security_class(struct policydb *p, const char *name); 342 extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name); 343 344 #endif /* _SS_POLICYDB_H_ */ 345 346