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 */ 45struct perm_datum { 46 u32 value; /* permission bit + 1 */ 47}; 48 49/* Attributes of a common prefix for access vectors */ 50struct common_datum { 51 u32 value; /* internal common value */ 52 struct symtab permissions; /* common permissions */ 53}; 54 55/* Class attributes */ 56struct 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 */ 66struct 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 73struct 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 80struct role_allow { 81 u32 role; /* current role */ 82 u32 new_role; /* new role */ 83 struct role_allow *next; 84}; 85 86/* Type attributes */ 87struct 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 */ 95struct 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 */ 105struct 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 */ 111struct cat_datum { 112 u32 value; /* internal category bit + 1 */ 113 unsigned char isalias; /* is this category an alias for another? */ 114}; 115 116struct range_trans { 117 u32 source_type; 118 u32 target_type; 119 u32 target_class; 120}; 121 122/* Boolean data type */ 123struct cond_bool_datum { 124 __u32 value; /* internal type value */ 125 int state; 126}; 127 128struct 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 */ 137struct 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 163struct 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 */ 191struct 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 char **sym_val_to_name[SYM_NUM]; 207#define p_common_val_to_name sym_val_to_name[SYM_COMMONS] 208#define p_class_val_to_name sym_val_to_name[SYM_CLASSES] 209#define p_role_val_to_name sym_val_to_name[SYM_ROLES] 210#define p_type_val_to_name sym_val_to_name[SYM_TYPES] 211#define p_user_val_to_name sym_val_to_name[SYM_USERS] 212#define p_bool_val_to_name sym_val_to_name[SYM_BOOLS] 213#define p_sens_val_to_name sym_val_to_name[SYM_LEVELS] 214#define p_cat_val_to_name sym_val_to_name[SYM_CATS] 215 216 /* class, role, and user attributes indexed by (value - 1) */ 217 struct class_datum **class_val_to_struct; 218 struct role_datum **role_val_to_struct; 219 struct user_datum **user_val_to_struct; 220 struct type_datum **type_val_to_struct; 221 222 /* type enforcement access vectors and transitions */ 223 struct avtab te_avtab; 224 225 /* role transitions */ 226 struct role_trans *role_tr; 227 228 /* bools indexed by (value - 1) */ 229 struct cond_bool_datum **bool_val_to_struct; 230 /* type enforcement conditional access vectors and transitions */ 231 struct avtab te_cond_avtab; 232 /* linked list indexing te_cond_avtab by conditional */ 233 struct cond_node *cond_list; 234 235 /* role allows */ 236 struct role_allow *role_allow; 237 238 /* security contexts of initial SIDs, unlabeled file systems, 239 TCP or UDP port numbers, network interfaces and nodes */ 240 struct ocontext *ocontexts[OCON_NUM]; 241 242 /* security contexts for files in filesystems that cannot support 243 a persistent label mapping or use another 244 fixed labeling behavior. */ 245 struct genfs *genfs; 246 247 /* range transitions table (range_trans_key -> mls_range) */ 248 struct hashtab *range_tr; 249 250 /* type -> attribute reverse mapping */ 251 struct flex_array *type_attr_map_array; 252 253 struct ebitmap policycaps; 254 255 struct ebitmap permissive_map; 256 257 unsigned int policyvers; 258 259 unsigned int reject_unknown : 1; 260 unsigned int allow_unknown : 1; 261 262 u16 process_class; 263 u32 process_trans_perms; 264}; 265 266extern void policydb_destroy(struct policydb *p); 267extern int policydb_load_isids(struct policydb *p, struct sidtab *s); 268extern int policydb_context_isvalid(struct policydb *p, struct context *c); 269extern int policydb_class_isvalid(struct policydb *p, unsigned int class); 270extern int policydb_type_isvalid(struct policydb *p, unsigned int type); 271extern int policydb_role_isvalid(struct policydb *p, unsigned int role); 272extern int policydb_read(struct policydb *p, void *fp); 273 274#define PERM_SYMTAB_SIZE 32 275 276#define POLICYDB_CONFIG_MLS 1 277 278/* the config flags related to unknown classes/perms are bits 2 and 3 */ 279#define REJECT_UNKNOWN 0x00000002 280#define ALLOW_UNKNOWN 0x00000004 281 282#define OBJECT_R "object_r" 283#define OBJECT_R_VAL 1 284 285#define POLICYDB_MAGIC SELINUX_MAGIC 286#define POLICYDB_STRING "SE Linux" 287 288struct policy_file { 289 char *data; 290 size_t len; 291}; 292 293static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes) 294{ 295 if (bytes > fp->len) 296 return -EINVAL; 297 298 memcpy(buf, fp->data, bytes); 299 fp->data += bytes; 300 fp->len -= bytes; 301 return 0; 302} 303 304extern u16 string_to_security_class(struct policydb *p, const char *name); 305extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name); 306 307#endif /* _SS_POLICYDB_H_ */ 308