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 "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 }; 62 63 /* Role attributes */ 64 struct role_datum { 65 u32 value; /* internal role value */ 66 u32 bounds; /* boundary of role */ 67 struct ebitmap dominates; /* set of roles dominated by this role */ 68 struct ebitmap types; /* set of authorized types for role */ 69 }; 70 71 struct role_trans { 72 u32 role; /* current role */ 73 u32 type; /* program executable type */ 74 u32 new_role; /* new role */ 75 struct role_trans *next; 76 }; 77 78 struct role_allow { 79 u32 role; /* current role */ 80 u32 new_role; /* new role */ 81 struct role_allow *next; 82 }; 83 84 /* Type attributes */ 85 struct type_datum { 86 u32 value; /* internal type value */ 87 u32 bounds; /* boundary of type */ 88 unsigned char primary; /* primary name? */ 89 unsigned char attribute;/* attribute ?*/ 90 }; 91 92 /* User attributes */ 93 struct user_datum { 94 u32 value; /* internal user value */ 95 u32 bounds; /* bounds of user */ 96 struct ebitmap roles; /* set of authorized roles for user */ 97 struct mls_range range; /* MLS range (min - max) for user */ 98 struct mls_level dfltlevel; /* default login MLS level for user */ 99 }; 100 101 102 /* Sensitivity attributes */ 103 struct level_datum { 104 struct mls_level *level; /* sensitivity and associated categories */ 105 unsigned char isalias; /* is this sensitivity an alias for another? */ 106 }; 107 108 /* Category attributes */ 109 struct cat_datum { 110 u32 value; /* internal category bit + 1 */ 111 unsigned char isalias; /* is this category an alias for another? */ 112 }; 113 114 struct range_trans { 115 u32 source_type; 116 u32 target_type; 117 u32 target_class; 118 }; 119 120 /* Boolean data type */ 121 struct cond_bool_datum { 122 __u32 value; /* internal type value */ 123 int state; 124 }; 125 126 struct cond_node; 127 128 /* 129 * The configuration data includes security contexts for 130 * initial SIDs, unlabeled file systems, TCP and UDP port numbers, 131 * network interfaces, and nodes. This structure stores the 132 * relevant data for one such entry. Entries of the same kind 133 * (e.g. all initial SIDs) are linked together into a list. 134 */ 135 struct ocontext { 136 union { 137 char *name; /* name of initial SID, fs, netif, fstype, path */ 138 struct { 139 u8 protocol; 140 u16 low_port; 141 u16 high_port; 142 } port; /* TCP or UDP port information */ 143 struct { 144 u32 addr; 145 u32 mask; 146 } node; /* node information */ 147 struct { 148 u32 addr[4]; 149 u32 mask[4]; 150 } node6; /* IPv6 node information */ 151 } u; 152 union { 153 u32 sclass; /* security class for genfs */ 154 u32 behavior; /* labeling behavior for fs_use */ 155 } v; 156 struct context context[2]; /* security context(s) */ 157 u32 sid[2]; /* SID(s) */ 158 struct ocontext *next; 159 }; 160 161 struct genfs { 162 char *fstype; 163 struct ocontext *head; 164 struct genfs *next; 165 }; 166 167 /* symbol table array indices */ 168 #define SYM_COMMONS 0 169 #define SYM_CLASSES 1 170 #define SYM_ROLES 2 171 #define SYM_TYPES 3 172 #define SYM_USERS 4 173 #define SYM_BOOLS 5 174 #define SYM_LEVELS 6 175 #define SYM_CATS 7 176 #define SYM_NUM 8 177 178 /* object context array indices */ 179 #define OCON_ISID 0 /* initial SIDs */ 180 #define OCON_FS 1 /* unlabeled file systems */ 181 #define OCON_PORT 2 /* TCP and UDP port numbers */ 182 #define OCON_NETIF 3 /* network interfaces */ 183 #define OCON_NODE 4 /* nodes */ 184 #define OCON_FSUSE 5 /* fs_use */ 185 #define OCON_NODE6 6 /* IPv6 nodes */ 186 #define OCON_NUM 7 187 188 /* The policy database */ 189 struct policydb { 190 int mls_enabled; 191 192 /* symbol tables */ 193 struct symtab symtab[SYM_NUM]; 194 #define p_commons symtab[SYM_COMMONS] 195 #define p_classes symtab[SYM_CLASSES] 196 #define p_roles symtab[SYM_ROLES] 197 #define p_types symtab[SYM_TYPES] 198 #define p_users symtab[SYM_USERS] 199 #define p_bools symtab[SYM_BOOLS] 200 #define p_levels symtab[SYM_LEVELS] 201 #define p_cats symtab[SYM_CATS] 202 203 /* symbol names indexed by (value - 1) */ 204 char **sym_val_to_name[SYM_NUM]; 205 #define p_common_val_to_name sym_val_to_name[SYM_COMMONS] 206 #define p_class_val_to_name sym_val_to_name[SYM_CLASSES] 207 #define p_role_val_to_name sym_val_to_name[SYM_ROLES] 208 #define p_type_val_to_name sym_val_to_name[SYM_TYPES] 209 #define p_user_val_to_name sym_val_to_name[SYM_USERS] 210 #define p_bool_val_to_name sym_val_to_name[SYM_BOOLS] 211 #define p_sens_val_to_name sym_val_to_name[SYM_LEVELS] 212 #define p_cat_val_to_name sym_val_to_name[SYM_CATS] 213 214 /* class, role, and user attributes indexed by (value - 1) */ 215 struct class_datum **class_val_to_struct; 216 struct role_datum **role_val_to_struct; 217 struct user_datum **user_val_to_struct; 218 struct type_datum **type_val_to_struct; 219 220 /* type enforcement access vectors and transitions */ 221 struct avtab te_avtab; 222 223 /* role transitions */ 224 struct role_trans *role_tr; 225 226 /* bools indexed by (value - 1) */ 227 struct cond_bool_datum **bool_val_to_struct; 228 /* type enforcement conditional access vectors and transitions */ 229 struct avtab te_cond_avtab; 230 /* linked list indexing te_cond_avtab by conditional */ 231 struct cond_node *cond_list; 232 233 /* role allows */ 234 struct role_allow *role_allow; 235 236 /* security contexts of initial SIDs, unlabeled file systems, 237 TCP or UDP port numbers, network interfaces and nodes */ 238 struct ocontext *ocontexts[OCON_NUM]; 239 240 /* security contexts for files in filesystems that cannot support 241 a persistent label mapping or use another 242 fixed labeling behavior. */ 243 struct genfs *genfs; 244 245 /* range transitions table (range_trans_key -> mls_range) */ 246 struct hashtab *range_tr; 247 248 /* type -> attribute reverse mapping */ 249 struct ebitmap *type_attr_map; 250 251 struct ebitmap policycaps; 252 253 struct ebitmap permissive_map; 254 255 unsigned int policyvers; 256 257 unsigned int reject_unknown : 1; 258 unsigned int allow_unknown : 1; 259 260 u16 process_class; 261 u32 process_trans_perms; 262 }; 263 264 extern void policydb_destroy(struct policydb *p); 265 extern int policydb_load_isids(struct policydb *p, struct sidtab *s); 266 extern int policydb_context_isvalid(struct policydb *p, struct context *c); 267 extern int policydb_class_isvalid(struct policydb *p, unsigned int class); 268 extern int policydb_type_isvalid(struct policydb *p, unsigned int type); 269 extern int policydb_role_isvalid(struct policydb *p, unsigned int role); 270 extern int policydb_read(struct policydb *p, void *fp); 271 272 #define PERM_SYMTAB_SIZE 32 273 274 #define POLICYDB_CONFIG_MLS 1 275 276 /* the config flags related to unknown classes/perms are bits 2 and 3 */ 277 #define REJECT_UNKNOWN 0x00000002 278 #define ALLOW_UNKNOWN 0x00000004 279 280 #define OBJECT_R "object_r" 281 #define OBJECT_R_VAL 1 282 283 #define POLICYDB_MAGIC SELINUX_MAGIC 284 #define POLICYDB_STRING "SE Linux" 285 286 struct policy_file { 287 char *data; 288 size_t len; 289 }; 290 291 static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes) 292 { 293 if (bytes > fp->len) 294 return -EINVAL; 295 296 memcpy(buf, fp->data, bytes); 297 fp->data += bytes; 298 fp->len -= bytes; 299 return 0; 300 } 301 302 extern u16 string_to_security_class(struct policydb *p, const char *name); 303 extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name); 304 305 #endif /* _SS_POLICYDB_H_ */ 306 307