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 "context.h" 31 #include "constraint.h" 32 33 /* 34 * A datum type is defined for each kind of symbol 35 * in the configuration data: individual permissions, 36 * common prefixes for access vectors, classes, 37 * users, roles, types, sensitivities, categories, etc. 38 */ 39 40 /* Permission attributes */ 41 struct perm_datum { 42 u32 value; /* permission bit + 1 */ 43 }; 44 45 /* Attributes of a common prefix for access vectors */ 46 struct common_datum { 47 u32 value; /* internal common value */ 48 struct symtab permissions; /* common permissions */ 49 }; 50 51 /* Class attributes */ 52 struct class_datum { 53 u32 value; /* class value */ 54 char *comkey; /* common name */ 55 struct common_datum *comdatum; /* common datum */ 56 struct symtab permissions; /* class-specific permission symbol table */ 57 struct constraint_node *constraints; /* constraints on class permissions */ 58 struct constraint_node *validatetrans; /* special transition rules */ 59 }; 60 61 /* Role attributes */ 62 struct role_datum { 63 u32 value; /* internal role value */ 64 u32 bounds; /* boundary of role */ 65 struct ebitmap dominates; /* set of roles dominated by this role */ 66 struct ebitmap types; /* set of authorized types for role */ 67 }; 68 69 struct role_trans { 70 u32 role; /* current role */ 71 u32 type; /* program executable type */ 72 u32 new_role; /* new role */ 73 struct role_trans *next; 74 }; 75 76 struct role_allow { 77 u32 role; /* current role */ 78 u32 new_role; /* new role */ 79 struct role_allow *next; 80 }; 81 82 /* Type attributes */ 83 struct type_datum { 84 u32 value; /* internal type value */ 85 u32 bounds; /* boundary of type */ 86 unsigned char primary; /* primary name? */ 87 unsigned char attribute;/* attribute ?*/ 88 }; 89 90 /* User attributes */ 91 struct user_datum { 92 u32 value; /* internal user value */ 93 u32 bounds; /* bounds of user */ 94 struct ebitmap roles; /* set of authorized roles for user */ 95 struct mls_range range; /* MLS range (min - max) for user */ 96 struct mls_level dfltlevel; /* default login MLS level for user */ 97 }; 98 99 100 /* Sensitivity attributes */ 101 struct level_datum { 102 struct mls_level *level; /* sensitivity and associated categories */ 103 unsigned char isalias; /* is this sensitivity an alias for another? */ 104 }; 105 106 /* Category attributes */ 107 struct cat_datum { 108 u32 value; /* internal category bit + 1 */ 109 unsigned char isalias; /* is this category an alias for another? */ 110 }; 111 112 struct range_trans { 113 u32 source_type; 114 u32 target_type; 115 u32 target_class; 116 struct mls_range target_range; 117 struct range_trans *next; 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 /* symbol tables */ 191 struct symtab symtab[SYM_NUM]; 192 #define p_commons symtab[SYM_COMMONS] 193 #define p_classes symtab[SYM_CLASSES] 194 #define p_roles symtab[SYM_ROLES] 195 #define p_types symtab[SYM_TYPES] 196 #define p_users symtab[SYM_USERS] 197 #define p_bools symtab[SYM_BOOLS] 198 #define p_levels symtab[SYM_LEVELS] 199 #define p_cats symtab[SYM_CATS] 200 201 /* symbol names indexed by (value - 1) */ 202 char **sym_val_to_name[SYM_NUM]; 203 #define p_common_val_to_name sym_val_to_name[SYM_COMMONS] 204 #define p_class_val_to_name sym_val_to_name[SYM_CLASSES] 205 #define p_role_val_to_name sym_val_to_name[SYM_ROLES] 206 #define p_type_val_to_name sym_val_to_name[SYM_TYPES] 207 #define p_user_val_to_name sym_val_to_name[SYM_USERS] 208 #define p_bool_val_to_name sym_val_to_name[SYM_BOOLS] 209 #define p_sens_val_to_name sym_val_to_name[SYM_LEVELS] 210 #define p_cat_val_to_name sym_val_to_name[SYM_CATS] 211 212 /* class, role, and user attributes indexed by (value - 1) */ 213 struct class_datum **class_val_to_struct; 214 struct role_datum **role_val_to_struct; 215 struct user_datum **user_val_to_struct; 216 struct type_datum **type_val_to_struct; 217 218 /* type enforcement access vectors and transitions */ 219 struct avtab te_avtab; 220 221 /* role transitions */ 222 struct role_trans *role_tr; 223 224 /* bools indexed by (value - 1) */ 225 struct cond_bool_datum **bool_val_to_struct; 226 /* type enforcement conditional access vectors and transitions */ 227 struct avtab te_cond_avtab; 228 /* linked list indexing te_cond_avtab by conditional */ 229 struct cond_node *cond_list; 230 231 /* role allows */ 232 struct role_allow *role_allow; 233 234 /* security contexts of initial SIDs, unlabeled file systems, 235 TCP or UDP port numbers, network interfaces and nodes */ 236 struct ocontext *ocontexts[OCON_NUM]; 237 238 /* security contexts for files in filesystems that cannot support 239 a persistent label mapping or use another 240 fixed labeling behavior. */ 241 struct genfs *genfs; 242 243 /* range transitions */ 244 struct range_trans *range_tr; 245 246 /* type -> attribute reverse mapping */ 247 struct ebitmap *type_attr_map; 248 249 struct ebitmap policycaps; 250 251 struct ebitmap permissive_map; 252 253 unsigned int policyvers; 254 255 unsigned int reject_unknown : 1; 256 unsigned int allow_unknown : 1; 257 258 u16 process_class; 259 u32 process_trans_perms; 260 }; 261 262 extern void policydb_destroy(struct policydb *p); 263 extern int policydb_load_isids(struct policydb *p, struct sidtab *s); 264 extern int policydb_context_isvalid(struct policydb *p, struct context *c); 265 extern int policydb_class_isvalid(struct policydb *p, unsigned int class); 266 extern int policydb_type_isvalid(struct policydb *p, unsigned int type); 267 extern int policydb_role_isvalid(struct policydb *p, unsigned int role); 268 extern int policydb_read(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 static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes) 290 { 291 if (bytes > fp->len) 292 return -EINVAL; 293 294 memcpy(buf, fp->data, bytes); 295 fp->data += bytes; 296 fp->len -= bytes; 297 return 0; 298 } 299 300 extern u16 string_to_security_class(struct policydb *p, const char *name); 301 extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name); 302 303 #endif /* _SS_POLICYDB_H_ */ 304 305