security/selinux/ss/policydb.h

   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         u32 *undefined_perms;
 258 };
 259
 260 extern void policydb_destroy(struct policydb *p);
 261 extern int policydb_load_isids(struct policydb *p, struct sidtab *s);
 262 extern int policydb_context_isvalid(struct policydb *p, struct context *c);
 263 extern int policydb_class_isvalid(struct policydb *p, unsigned int class);
 264 extern int policydb_type_isvalid(struct policydb *p, unsigned int type);
 265 extern int policydb_role_isvalid(struct policydb *p, unsigned int role);
 266 extern int policydb_read(struct policydb *p, void *fp);
 267
 268 #define PERM_SYMTAB_SIZE 32
 269
 270 #define POLICYDB_CONFIG_MLS    1
 271
 272 /* the config flags related to unknown classes/perms are bits 2 and 3 */
 273 #define REJECT_UNKNOWN  0x00000002
 274 #define ALLOW_UNKNOWN   0x00000004
 275
 276 #define OBJECT_R "object_r"
 277 #define OBJECT_R_VAL 1
 278
 279 #define POLICYDB_MAGIC SELINUX_MAGIC
 280 #define POLICYDB_STRING "SE Linux"
 281
 282 struct policy_file {
 283         char *data;
 284         size_t len;
 285 };
 286
 287 static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes)
 288 {
 289         if (bytes > fp->len)
 290                 return -EINVAL;
 291
 292         memcpy(buf, fp->data, bytes);
 293         fp->data += bytes;
 294         fp->len -= bytes;
 295         return 0;
 296 }
 297
 298 #endif  /* _SS_POLICYDB_H_ */
 299