• Home
  • History
  • Annotate
  • Line#
  • Navigate
  • Raw
  • Download
  • only in /asuswrt-rt-n18u-9.0.0.4.380.2695/release/src-rt-6.x.4708/linux/linux-2.6/security/selinux/ss/
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