2 * A policy database (policydb) specifies the
3 * configuration data for the security policy.
5 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
9 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
11 * Support for enhanced MLS infrastructure.
13 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
15 * Added conditional policy language extensions
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.
24 #ifndef _SS_POLICYDB_H_
25 #define _SS_POLICYDB_H_
27 #include <linux/flex_array.h>
33 #include "mls_types.h"
35 #include "constraint.h"
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.
44 /* Permission attributes */
46 u32 value; /* permission bit + 1 */
49 /* Attributes of a common prefix for access vectors */
51 u32 value; /* internal common value */
52 struct symtab permissions; /* common permissions */
55 /* Class attributes */
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 /* Options how a new object user and role should be decided */
64 #define DEFAULT_SOURCE 1
65 #define DEFAULT_TARGET 2
68 /* Options how a new object range should be decided */
69 #define DEFAULT_SOURCE_LOW 1
70 #define DEFAULT_SOURCE_HIGH 2
71 #define DEFAULT_SOURCE_LOW_HIGH 3
72 #define DEFAULT_TARGET_LOW 4
73 #define DEFAULT_TARGET_HIGH 5
74 #define DEFAULT_TARGET_LOW_HIGH 6
80 u32 value; /* internal role value */
81 u32 bounds; /* boundary of role */
82 struct ebitmap dominates; /* set of roles dominated by this role */
83 struct ebitmap types; /* set of authorized types for role */
87 u32 role; /* current role */
88 u32 type; /* program executable type, or new object type */
89 u32 tclass; /* process class, or new object class */
90 u32 new_role; /* new role */
91 struct role_trans *next;
94 struct filename_trans {
95 u32 stype; /* current process */
96 u32 ttype; /* parent dir context */
97 u16 tclass; /* class of new object */
98 const char *name; /* last path component */
101 struct filename_trans_datum {
102 u32 otype; /* expected of new object */
106 u32 role; /* current role */
107 u32 new_role; /* new role */
108 struct role_allow *next;
111 /* Type attributes */
113 u32 value; /* internal type value */
114 u32 bounds; /* boundary of type */
115 unsigned char primary; /* primary name? */
116 unsigned char attribute;/* attribute ?*/
119 /* User attributes */
121 u32 value; /* internal user value */
122 u32 bounds; /* bounds of user */
123 struct ebitmap roles; /* set of authorized roles for user */
124 struct mls_range range; /* MLS range (min - max) for user */
125 struct mls_level dfltlevel; /* default login MLS level for user */
129 /* Sensitivity attributes */
131 struct mls_level *level; /* sensitivity and associated categories */
132 unsigned char isalias; /* is this sensitivity an alias for another? */
135 /* Category attributes */
137 u32 value; /* internal category bit + 1 */
138 unsigned char isalias; /* is this category an alias for another? */
147 /* Boolean data type */
148 struct cond_bool_datum {
149 __u32 value; /* internal type value */
156 * The configuration data includes security contexts for
157 * initial SIDs, unlabeled file systems, TCP and UDP port numbers,
158 * network interfaces, and nodes. This structure stores the
159 * relevant data for one such entry. Entries of the same kind
160 * (e.g. all initial SIDs) are linked together into a list.
164 char *name; /* name of initial SID, fs, netif, fstype, path */
169 } port; /* TCP or UDP port information */
173 } node; /* node information */
177 } node6; /* IPv6 node information */
180 u32 sclass; /* security class for genfs */
181 u32 behavior; /* labeling behavior for fs_use */
183 struct context context[2]; /* security context(s) */
184 u32 sid[2]; /* SID(s) */
185 struct ocontext *next;
190 struct ocontext *head;
194 /* symbol table array indices */
195 #define SYM_COMMONS 0
196 #define SYM_CLASSES 1
205 /* object context array indices */
206 #define OCON_ISID 0 /* initial SIDs */
207 #define OCON_FS 1 /* unlabeled file systems */
208 #define OCON_PORT 2 /* TCP and UDP port numbers */
209 #define OCON_NETIF 3 /* network interfaces */
210 #define OCON_NODE 4 /* nodes */
211 #define OCON_FSUSE 5 /* fs_use */
212 #define OCON_NODE6 6 /* IPv6 nodes */
215 /* The policy database */
220 struct symtab symtab[SYM_NUM];
221 #define p_commons symtab[SYM_COMMONS]
222 #define p_classes symtab[SYM_CLASSES]
223 #define p_roles symtab[SYM_ROLES]
224 #define p_types symtab[SYM_TYPES]
225 #define p_users symtab[SYM_USERS]
226 #define p_bools symtab[SYM_BOOLS]
227 #define p_levels symtab[SYM_LEVELS]
228 #define p_cats symtab[SYM_CATS]
230 /* symbol names indexed by (value - 1) */
231 struct flex_array *sym_val_to_name[SYM_NUM];
233 /* class, role, and user attributes indexed by (value - 1) */
234 struct class_datum **class_val_to_struct;
235 struct role_datum **role_val_to_struct;
236 struct user_datum **user_val_to_struct;
237 struct flex_array *type_val_to_struct_array;
239 /* type enforcement access vectors and transitions */
240 struct avtab te_avtab;
242 /* role transitions */
243 struct role_trans *role_tr;
245 /* file transitions with the last path component */
246 /* quickly exclude lookups when parent ttype has no rules */
247 struct ebitmap filename_trans_ttypes;
248 /* actual set of filename_trans rules */
249 struct hashtab *filename_trans;
251 /* bools indexed by (value - 1) */
252 struct cond_bool_datum **bool_val_to_struct;
253 /* type enforcement conditional access vectors and transitions */
254 struct avtab te_cond_avtab;
255 /* linked list indexing te_cond_avtab by conditional */
256 struct cond_node *cond_list;
259 struct role_allow *role_allow;
261 /* security contexts of initial SIDs, unlabeled file systems,
262 TCP or UDP port numbers, network interfaces and nodes */
263 struct ocontext *ocontexts[OCON_NUM];
265 /* security contexts for files in filesystems that cannot support
266 a persistent label mapping or use another
267 fixed labeling behavior. */
270 /* range transitions table (range_trans_key -> mls_range) */
271 struct hashtab *range_tr;
273 /* type -> attribute reverse mapping */
274 struct flex_array *type_attr_map_array;
276 struct ebitmap policycaps;
278 struct ebitmap permissive_map;
280 /* length of this policy when it was loaded */
283 unsigned int policyvers;
285 unsigned int reject_unknown : 1;
286 unsigned int allow_unknown : 1;
289 u32 process_trans_perms;
292 extern void policydb_destroy(struct policydb *p);
293 extern int policydb_load_isids(struct policydb *p, struct sidtab *s);
294 extern int policydb_context_isvalid(struct policydb *p, struct context *c);
295 extern int policydb_class_isvalid(struct policydb *p, unsigned int class);
296 extern int policydb_type_isvalid(struct policydb *p, unsigned int type);
297 extern int policydb_role_isvalid(struct policydb *p, unsigned int role);
298 extern int policydb_read(struct policydb *p, void *fp);
299 extern int policydb_write(struct policydb *p, void *fp);
301 #define PERM_SYMTAB_SIZE 32
303 #define POLICYDB_CONFIG_MLS 1
305 /* the config flags related to unknown classes/perms are bits 2 and 3 */
306 #define REJECT_UNKNOWN 0x00000002
307 #define ALLOW_UNKNOWN 0x00000004
309 #define OBJECT_R "object_r"
310 #define OBJECT_R_VAL 1
312 #define POLICYDB_MAGIC SELINUX_MAGIC
313 #define POLICYDB_STRING "SE Linux"
325 static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes)
330 memcpy(buf, fp->data, bytes);
336 static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp)
338 size_t len = bytes * num;
340 memcpy(fp->data, buf, len);
347 static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr)
349 struct flex_array *fa = p->sym_val_to_name[sym_num];
351 return flex_array_get_ptr(fa, element_nr);
354 extern u16 string_to_security_class(struct policydb *p, const char *name);
355 extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name);
357 #endif /* _SS_POLICYDB_H_ */