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 */ 76 u32 new_role; /* new role */ 77 struct role_trans *next; 78 }; 79 80 struct role_allow { 81 u32 role; /* current role */ 82 u32 new_role; /* new role */ 83 struct role_allow *next; 84 }; 85 86 /* Type attributes */ 87 struct type_datum { 88 u32 value; /* internal type value */ 89 u32 bounds; /* boundary of type */ 90 unsigned char primary; /* primary name? */ 91 unsigned char attribute;/* attribute ?*/ 92 }; 93 94 /* User attributes */ 95 struct user_datum { 96 u32 value; /* internal user value */ 97 u32 bounds; /* bounds of user */ 98 struct ebitmap roles; /* set of authorized roles for user */ 99 struct mls_range range; /* MLS range (min - max) for user */ 100 struct mls_level dfltlevel; /* default login MLS level for user */ 101 }; 102 103 104 /* Sensitivity attributes */ 105 struct level_datum { 106 struct mls_level *level; /* sensitivity and associated categories */ 107 unsigned char isalias; /* is this sensitivity an alias for another? */ 108 }; 109 110 /* Category attributes */ 111 struct cat_datum { 112 u32 value; /* internal category bit + 1 */ 113 unsigned char isalias; /* is this category an alias for another? */ 114 }; 115 116 struct range_trans { 117 u32 source_type; 118 u32 target_type; 119 u32 target_class; 120 }; 121 122 /* Boolean data type */ 123 struct cond_bool_datum { 124 __u32 value; /* internal type value */ 125 int state; 126 }; 127 128 struct cond_node; 129 130 /* 131 * The configuration data includes security contexts for 132 * initial SIDs, unlabeled file systems, TCP and UDP port numbers, 133 * network interfaces, and nodes. This structure stores the 134 * relevant data for one such entry. Entries of the same kind 135 * (e.g. all initial SIDs) are linked together into a list. 136 */ 137 struct ocontext { 138 union { 139 char *name; /* name of initial SID, fs, netif, fstype, path */ 140 struct { 141 u8 protocol; 142 u16 low_port; 143 u16 high_port; 144 } port; /* TCP or UDP port information */ 145 struct { 146 u32 addr; 147 u32 mask; 148 } node; /* node information */ 149 struct { 150 u32 addr[4]; 151 u32 mask[4]; 152 } node6; /* IPv6 node information */ 153 } u; 154 union { 155 u32 sclass; /* security class for genfs */ 156 u32 behavior; /* labeling behavior for fs_use */ 157 } v; 158 struct context context[2]; /* security context(s) */ 159 u32 sid[2]; /* SID(s) */ 160 struct ocontext *next; 161 }; 162 163 struct genfs { 164 char *fstype; 165 struct ocontext *head; 166 struct genfs *next; 167 }; 168 169 /* symbol table array indices */ 170 #define SYM_COMMONS 0 171 #define SYM_CLASSES 1 172 #define SYM_ROLES 2 173 #define SYM_TYPES 3 174 #define SYM_USERS 4 175 #define SYM_BOOLS 5 176 #define SYM_LEVELS 6 177 #define SYM_CATS 7 178 #define SYM_NUM 8 179 180 /* object context array indices */ 181 #define OCON_ISID 0 /* initial SIDs */ 182 #define OCON_FS 1 /* unlabeled file systems */ 183 #define OCON_PORT 2 /* TCP and UDP port numbers */ 184 #define OCON_NETIF 3 /* network interfaces */ 185 #define OCON_NODE 4 /* nodes */ 186 #define OCON_FSUSE 5 /* fs_use */ 187 #define OCON_NODE6 6 /* IPv6 nodes */ 188 #define OCON_NUM 7 189 190 /* The policy database */ 191 struct policydb { 192 int mls_enabled; 193 194 /* symbol tables */ 195 struct symtab symtab[SYM_NUM]; 196 #define p_commons symtab[SYM_COMMONS] 197 #define p_classes symtab[SYM_CLASSES] 198 #define p_roles symtab[SYM_ROLES] 199 #define p_types symtab[SYM_TYPES] 200 #define p_users symtab[SYM_USERS] 201 #define p_bools symtab[SYM_BOOLS] 202 #define p_levels symtab[SYM_LEVELS] 203 #define p_cats symtab[SYM_CATS] 204 205 /* symbol names indexed by (value - 1) */ 206 struct flex_array *sym_val_to_name[SYM_NUM]; 207 208 /* class, role, and user attributes indexed by (value - 1) */ 209 struct class_datum **class_val_to_struct; 210 struct role_datum **role_val_to_struct; 211 struct user_datum **user_val_to_struct; 212 struct flex_array *type_val_to_struct_array; 213 214 /* type enforcement access vectors and transitions */ 215 struct avtab te_avtab; 216 217 /* role transitions */ 218 struct role_trans *role_tr; 219 220 /* bools indexed by (value - 1) */ 221 struct cond_bool_datum **bool_val_to_struct; 222 /* type enforcement conditional access vectors and transitions */ 223 struct avtab te_cond_avtab; 224 /* linked list indexing te_cond_avtab by conditional */ 225 struct cond_node *cond_list; 226 227 /* role allows */ 228 struct role_allow *role_allow; 229 230 /* security contexts of initial SIDs, unlabeled file systems, 231 TCP or UDP port numbers, network interfaces and nodes */ 232 struct ocontext *ocontexts[OCON_NUM]; 233 234 /* security contexts for files in filesystems that cannot support 235 a persistent label mapping or use another 236 fixed labeling behavior. */ 237 struct genfs *genfs; 238 239 /* range transitions table (range_trans_key -> mls_range) */ 240 struct hashtab *range_tr; 241 242 /* type -> attribute reverse mapping */ 243 struct flex_array *type_attr_map_array; 244 245 struct ebitmap policycaps; 246 247 struct ebitmap permissive_map; 248 249 /* length of this policy when it was loaded */ 250 size_t len; 251 252 unsigned int policyvers; 253 254 unsigned int reject_unknown : 1; 255 unsigned int allow_unknown : 1; 256 257 u16 process_class; 258 u32 process_trans_perms; 259 }; 260 261 extern void policydb_destroy(struct policydb *p); 262 extern int policydb_load_isids(struct policydb *p, struct sidtab *s); 263 extern int policydb_context_isvalid(struct policydb *p, struct context *c); 264 extern int policydb_class_isvalid(struct policydb *p, unsigned int class); 265 extern int policydb_type_isvalid(struct policydb *p, unsigned int type); 266 extern int policydb_role_isvalid(struct policydb *p, unsigned int role); 267 extern int policydb_read(struct policydb *p, void *fp); 268 extern int policydb_write(struct policydb *p, void *fp); 269 270 #define PERM_SYMTAB_SIZE 32 271 272 #define POLICYDB_CONFIG_MLS 1 273 274 /* the config flags related to unknown classes/perms are bits 2 and 3 */ 275 #define REJECT_UNKNOWN 0x00000002 276 #define ALLOW_UNKNOWN 0x00000004 277 278 #define OBJECT_R "object_r" 279 #define OBJECT_R_VAL 1 280 281 #define POLICYDB_MAGIC SELINUX_MAGIC 282 #define POLICYDB_STRING "SE Linux" 283 284 struct policy_file { 285 char *data; 286 size_t len; 287 }; 288 289 struct policy_data { 290 struct policydb *p; 291 void *fp; 292 }; 293 294 static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes) 295 { 296 if (bytes > fp->len) 297 return -EINVAL; 298 299 memcpy(buf, fp->data, bytes); 300 fp->data += bytes; 301 fp->len -= bytes; 302 return 0; 303 } 304 305 static inline int put_entry(void *buf, size_t bytes, int num, struct policy_file *fp) 306 { 307 size_t len = bytes * num; 308 309 memcpy(fp->data, buf, len); 310 fp->data += len; 311 fp->len -= len; 312 313 return 0; 314 } 315 316 static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr) 317 { 318 struct flex_array *fa = p->sym_val_to_name[sym_num]; 319 320 return flex_array_get_ptr(fa, element_nr); 321 } 322 323 extern u16 string_to_security_class(struct policydb *p, const char *name); 324 extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name); 325 326 #endif /* _SS_POLICYDB_H_ */ 327 328