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