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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * A policy database (policydb) specifies the
4 * configuration data for the security policy.
5 *
6 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
7 */
8
9/*
10 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
11 *
12 * Support for enhanced MLS infrastructure.
13 *
14 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
15 *
16 * Added conditional policy language extensions
17 *
18 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
19 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
20 */
21
22#ifndef _SS_POLICYDB_H_
23#define _SS_POLICYDB_H_
24
25#include "symtab.h"
26#include "avtab.h"
27#include "sidtab.h"
28#include "ebitmap.h"
29#include "mls_types.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 */
41struct perm_datum {
42 u32 value; /* permission bit + 1 */
43};
44
45/* Attributes of a common prefix for access vectors */
46struct common_datum {
47 u32 value; /* internal common value */
48 struct symtab permissions; /* common permissions */
49};
50
51/* Class attributes */
52struct 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/* Options how a new object user, role, and type should be decided */
60#define DEFAULT_SOURCE 1
61#define DEFAULT_TARGET 2
62 char default_user;
63 char default_role;
64 char default_type;
65/* Options how a new object range should be decided */
66#define DEFAULT_SOURCE_LOW 1
67#define DEFAULT_SOURCE_HIGH 2
68#define DEFAULT_SOURCE_LOW_HIGH 3
69#define DEFAULT_TARGET_LOW 4
70#define DEFAULT_TARGET_HIGH 5
71#define DEFAULT_TARGET_LOW_HIGH 6
72 char default_range;
73};
74
75/* Role attributes */
76struct role_datum {
77 u32 value; /* internal role value */
78 u32 bounds; /* boundary of role */
79 struct ebitmap dominates; /* set of roles dominated by this role */
80 struct ebitmap types; /* set of authorized types for role */
81};
82
83struct role_trans {
84 u32 role; /* current role */
85 u32 type; /* program executable type, or new object type */
86 u32 tclass; /* process class, or new object class */
87 u32 new_role; /* new role */
88 struct role_trans *next;
89};
90
91struct filename_trans {
92 u32 stype; /* current process */
93 u32 ttype; /* parent dir context */
94 u16 tclass; /* class of new object */
95 const char *name; /* last path component */
96};
97
98struct filename_trans_datum {
99 u32 otype; /* expected of new object */
100};
101
102struct role_allow {
103 u32 role; /* current role */
104 u32 new_role; /* new role */
105 struct role_allow *next;
106};
107
108/* Type attributes */
109struct type_datum {
110 u32 value; /* internal type value */
111 u32 bounds; /* boundary of type */
112 unsigned char primary; /* primary name? */
113 unsigned char attribute;/* attribute ?*/
114};
115
116/* User attributes */
117struct user_datum {
118 u32 value; /* internal user value */
119 u32 bounds; /* bounds of user */
120 struct ebitmap roles; /* set of authorized roles for user */
121 struct mls_range range; /* MLS range (min - max) for user */
122 struct mls_level dfltlevel; /* default login MLS level for user */
123};
124
125
126/* Sensitivity attributes */
127struct level_datum {
128 struct mls_level *level; /* sensitivity and associated categories */
129 unsigned char isalias; /* is this sensitivity an alias for another? */
130};
131
132/* Category attributes */
133struct cat_datum {
134 u32 value; /* internal category bit + 1 */
135 unsigned char isalias; /* is this category an alias for another? */
136};
137
138struct range_trans {
139 u32 source_type;
140 u32 target_type;
141 u32 target_class;
142};
143
144/* Boolean data type */
145struct cond_bool_datum {
146 __u32 value; /* internal type value */
147 int state;
148};
149
150struct cond_node;
151
152/*
153 * type set preserves data needed to determine constraint info from
154 * policy source. This is not used by the kernel policy but allows
155 * utilities such as audit2allow to determine constraint denials.
156 */
157struct type_set {
158 struct ebitmap types;
159 struct ebitmap negset;
160 u32 flags;
161};
162
163/*
164 * The configuration data includes security contexts for
165 * initial SIDs, unlabeled file systems, TCP and UDP port numbers,
166 * network interfaces, and nodes. This structure stores the
167 * relevant data for one such entry. Entries of the same kind
168 * (e.g. all initial SIDs) are linked together into a list.
169 */
170struct ocontext {
171 union {
172 char *name; /* name of initial SID, fs, netif, fstype, path */
173 struct {
174 u8 protocol;
175 u16 low_port;
176 u16 high_port;
177 } port; /* TCP or UDP port information */
178 struct {
179 u32 addr;
180 u32 mask;
181 } node; /* node information */
182 struct {
183 u32 addr[4];
184 u32 mask[4];
185 } node6; /* IPv6 node information */
186 struct {
187 u64 subnet_prefix;
188 u16 low_pkey;
189 u16 high_pkey;
190 } ibpkey;
191 struct {
192 char *dev_name;
193 u8 port;
194 } ibendport;
195 } u;
196 union {
197 u32 sclass; /* security class for genfs */
198 u32 behavior; /* labeling behavior for fs_use */
199 } v;
200 struct context context[2]; /* security context(s) */
201 u32 sid[2]; /* SID(s) */
202 struct ocontext *next;
203};
204
205struct genfs {
206 char *fstype;
207 struct ocontext *head;
208 struct genfs *next;
209};
210
211/* symbol table array indices */
212#define SYM_COMMONS 0
213#define SYM_CLASSES 1
214#define SYM_ROLES 2
215#define SYM_TYPES 3
216#define SYM_USERS 4
217#define SYM_BOOLS 5
218#define SYM_LEVELS 6
219#define SYM_CATS 7
220#define SYM_NUM 8
221
222/* object context array indices */
223#define OCON_ISID 0 /* initial SIDs */
224#define OCON_FS 1 /* unlabeled file systems */
225#define OCON_PORT 2 /* TCP and UDP port numbers */
226#define OCON_NETIF 3 /* network interfaces */
227#define OCON_NODE 4 /* nodes */
228#define OCON_FSUSE 5 /* fs_use */
229#define OCON_NODE6 6 /* IPv6 nodes */
230#define OCON_IBPKEY 7 /* Infiniband PKeys */
231#define OCON_IBENDPORT 8 /* Infiniband end ports */
232#define OCON_NUM 9
233
234/* The policy database */
235struct policydb {
236 int mls_enabled;
237
238 /* symbol tables */
239 struct symtab symtab[SYM_NUM];
240#define p_commons symtab[SYM_COMMONS]
241#define p_classes symtab[SYM_CLASSES]
242#define p_roles symtab[SYM_ROLES]
243#define p_types symtab[SYM_TYPES]
244#define p_users symtab[SYM_USERS]
245#define p_bools symtab[SYM_BOOLS]
246#define p_levels symtab[SYM_LEVELS]
247#define p_cats symtab[SYM_CATS]
248
249 /* symbol names indexed by (value - 1) */
250 char **sym_val_to_name[SYM_NUM];
251
252 /* class, role, and user attributes indexed by (value - 1) */
253 struct class_datum **class_val_to_struct;
254 struct role_datum **role_val_to_struct;
255 struct user_datum **user_val_to_struct;
256 struct type_datum **type_val_to_struct;
257
258 /* type enforcement access vectors and transitions */
259 struct avtab te_avtab;
260
261 /* role transitions */
262 struct role_trans *role_tr;
263
264 /* file transitions with the last path component */
265 /* quickly exclude lookups when parent ttype has no rules */
266 struct ebitmap filename_trans_ttypes;
267 /* actual set of filename_trans rules */
268 struct hashtab *filename_trans;
269
270 /* bools indexed by (value - 1) */
271 struct cond_bool_datum **bool_val_to_struct;
272 /* type enforcement conditional access vectors and transitions */
273 struct avtab te_cond_avtab;
274 /* linked list indexing te_cond_avtab by conditional */
275 struct cond_node *cond_list;
276
277 /* role allows */
278 struct role_allow *role_allow;
279
280 /* security contexts of initial SIDs, unlabeled file systems,
281 TCP or UDP port numbers, network interfaces and nodes */
282 struct ocontext *ocontexts[OCON_NUM];
283
284 /* security contexts for files in filesystems that cannot support
285 a persistent label mapping or use another
286 fixed labeling behavior. */
287 struct genfs *genfs;
288
289 /* range transitions table (range_trans_key -> mls_range) */
290 struct hashtab *range_tr;
291
292 /* type -> attribute reverse mapping */
293 struct ebitmap *type_attr_map_array;
294
295 struct ebitmap policycaps;
296
297 struct ebitmap permissive_map;
298
299 /* length of this policy when it was loaded */
300 size_t len;
301
302 unsigned int policyvers;
303
304 unsigned int reject_unknown : 1;
305 unsigned int allow_unknown : 1;
306
307 u16 process_class;
308 u32 process_trans_perms;
309};
310
311extern void policydb_destroy(struct policydb *p);
312extern int policydb_load_isids(struct policydb *p, struct sidtab *s);
313extern int policydb_context_isvalid(struct policydb *p, struct context *c);
314extern int policydb_class_isvalid(struct policydb *p, unsigned int class);
315extern int policydb_type_isvalid(struct policydb *p, unsigned int type);
316extern int policydb_role_isvalid(struct policydb *p, unsigned int role);
317extern int policydb_read(struct policydb *p, void *fp);
318extern int policydb_write(struct policydb *p, void *fp);
319
320#define PERM_SYMTAB_SIZE 32
321
322#define POLICYDB_CONFIG_MLS 1
323
324/* the config flags related to unknown classes/perms are bits 2 and 3 */
325#define REJECT_UNKNOWN 0x00000002
326#define ALLOW_UNKNOWN 0x00000004
327
328#define OBJECT_R "object_r"
329#define OBJECT_R_VAL 1
330
331#define POLICYDB_MAGIC SELINUX_MAGIC
332#define POLICYDB_STRING "SE Linux"
333
334struct policy_file {
335 char *data;
336 size_t len;
337};
338
339struct policy_data {
340 struct policydb *p;
341 void *fp;
342};
343
344static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes)
345{
346 if (bytes > fp->len)
347 return -EINVAL;
348
349 memcpy(buf, fp->data, bytes);
350 fp->data += bytes;
351 fp->len -= bytes;
352 return 0;
353}
354
355static inline int put_entry(const void *buf, size_t bytes, int num, struct policy_file *fp)
356{
357 size_t len = bytes * num;
358
359 memcpy(fp->data, buf, len);
360 fp->data += len;
361 fp->len -= len;
362
363 return 0;
364}
365
366static inline char *sym_name(struct policydb *p, unsigned int sym_num, unsigned int element_nr)
367{
368 return p->sym_val_to_name[sym_num][element_nr];
369}
370
371extern u16 string_to_security_class(struct policydb *p, const char *name);
372extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name);
373
374#endif /* _SS_POLICYDB_H_ */
375
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * A policy database (policydb) specifies the
4 * configuration data for the security policy.
5 *
6 * Author : Stephen Smalley, <stephen.smalley.work@gmail.com>
7 */
8
9/*
10 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
11 * Support for enhanced MLS infrastructure.
12 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
13 *
14 * Updated: Frank Mayer <mayerf@tresys.com> and
15 * Karl MacMillan <kmacmillan@tresys.com>
16 * Added conditional policy language extensions
17 * Copyright (C) 2003-2004 Tresys Technology, LLC
18 */
19
20#ifndef _SS_POLICYDB_H_
21#define _SS_POLICYDB_H_
22
23#include "symtab.h"
24#include "avtab.h"
25#include "sidtab.h"
26#include "ebitmap.h"
27#include "mls_types.h"
28#include "context.h"
29#include "constraint.h"
30
31/*
32 * A datum type is defined for each kind of symbol
33 * in the configuration data: individual permissions,
34 * common prefixes for access vectors, classes,
35 * users, roles, types, sensitivities, categories, etc.
36 */
37
38/* Permission attributes */
39struct perm_datum {
40 u32 value; /* permission bit + 1 */
41};
42
43/* Attributes of a common prefix for access vectors */
44struct common_datum {
45 u32 value; /* internal common value */
46 struct symtab permissions; /* common permissions */
47};
48
49/* Class attributes */
50struct class_datum {
51 u32 value; /* class value */
52 char *comkey; /* common name */
53 struct common_datum *comdatum; /* common datum */
54 struct symtab permissions; /* class-specific permission symbol table */
55 struct constraint_node *constraints; /* constraints on class perms */
56 struct constraint_node *validatetrans; /* special transition rules */
57/* Options how a new object user, role, and type should be decided */
58#define DEFAULT_SOURCE 1
59#define DEFAULT_TARGET 2
60 char default_user;
61 char default_role;
62 char default_type;
63/* Options how a new object range should be decided */
64#define DEFAULT_SOURCE_LOW 1
65#define DEFAULT_SOURCE_HIGH 2
66#define DEFAULT_SOURCE_LOW_HIGH 3
67#define DEFAULT_TARGET_LOW 4
68#define DEFAULT_TARGET_HIGH 5
69#define DEFAULT_TARGET_LOW_HIGH 6
70#define DEFAULT_GLBLUB 7
71 char default_range;
72};
73
74/* Role attributes */
75struct role_datum {
76 u32 value; /* internal role value */
77 u32 bounds; /* boundary of role */
78 struct ebitmap dominates; /* set of roles dominated by this role */
79 struct ebitmap types; /* set of authorized types for role */
80};
81
82struct role_trans_key {
83 u32 role; /* current role */
84 u32 type; /* program executable type, or new object type */
85 u32 tclass; /* process class, or new object class */
86};
87
88struct role_trans_datum {
89 u32 new_role; /* new role */
90};
91
92struct filename_trans_key {
93 u32 ttype; /* parent dir context */
94 u16 tclass; /* class of new object */
95 const char *name; /* last path component */
96};
97
98struct filename_trans_datum {
99 struct ebitmap stypes; /* bitmap of source types for this otype */
100 u32 otype; /* resulting type of new object */
101 struct filename_trans_datum *next; /* record for next otype*/
102};
103
104struct role_allow {
105 u32 role; /* current role */
106 u32 new_role; /* new role */
107 struct role_allow *next;
108};
109
110/* Type attributes */
111struct type_datum {
112 u32 value; /* internal type value */
113 u32 bounds; /* boundary of type */
114 unsigned char primary; /* primary name? */
115 unsigned char attribute; /* attribute ?*/
116};
117
118/* User attributes */
119struct user_datum {
120 u32 value; /* internal user value */
121 u32 bounds; /* bounds of user */
122 struct ebitmap roles; /* set of authorized roles for user */
123 struct mls_range range; /* MLS range (min - max) for user */
124 struct mls_level dfltlevel; /* default login MLS level for user */
125};
126
127/* Sensitivity attributes */
128struct level_datum {
129 struct mls_level *level; /* sensitivity and associated categories */
130 unsigned char isalias; /* is this sensitivity an alias for another? */
131};
132
133/* Category attributes */
134struct cat_datum {
135 u32 value; /* internal category bit + 1 */
136 unsigned char isalias; /* is this category an alias for another? */
137};
138
139struct range_trans {
140 u32 source_type;
141 u32 target_type;
142 u32 target_class;
143};
144
145/* Boolean data type */
146struct cond_bool_datum {
147 __u32 value; /* internal type value */
148 int state;
149};
150
151struct cond_node;
152
153/*
154 * type set preserves data needed to determine constraint info from
155 * policy source. This is not used by the kernel policy but allows
156 * utilities such as audit2allow to determine constraint denials.
157 */
158struct type_set {
159 struct ebitmap types;
160 struct ebitmap negset;
161 u32 flags;
162};
163
164/*
165 * The configuration data includes security contexts for
166 * initial SIDs, unlabeled file systems, TCP and UDP port numbers,
167 * network interfaces, and nodes. This structure stores the
168 * relevant data for one such entry. Entries of the same kind
169 * (e.g. all initial SIDs) are linked together into a list.
170 */
171struct ocontext {
172 union {
173 char *name; /* name of initial SID, fs, netif, fstype, path */
174 struct {
175 u8 protocol;
176 u16 low_port;
177 u16 high_port;
178 } port; /* TCP or UDP port information */
179 struct {
180 u32 addr;
181 u32 mask;
182 } node; /* node information */
183 struct {
184 u32 addr[4];
185 u32 mask[4];
186 } node6; /* IPv6 node information */
187 struct {
188 u64 subnet_prefix;
189 u16 low_pkey;
190 u16 high_pkey;
191 } ibpkey;
192 struct {
193 char *dev_name;
194 u8 port;
195 } ibendport;
196 } u;
197 union {
198 u32 sclass; /* security class for genfs */
199 u32 behavior; /* labeling behavior for fs_use */
200 } v;
201 struct context context[2]; /* security context(s) */
202 u32 sid[2]; /* SID(s) */
203 struct ocontext *next;
204};
205
206struct genfs {
207 char *fstype;
208 struct ocontext *head;
209 struct genfs *next;
210};
211
212/* symbol table array indices */
213#define SYM_COMMONS 0
214#define SYM_CLASSES 1
215#define SYM_ROLES 2
216#define SYM_TYPES 3
217#define SYM_USERS 4
218#define SYM_BOOLS 5
219#define SYM_LEVELS 6
220#define SYM_CATS 7
221#define SYM_NUM 8
222
223/* object context array indices */
224#define OCON_ISID 0 /* initial SIDs */
225#define OCON_FS 1 /* unlabeled file systems (deprecated) */
226#define OCON_PORT 2 /* TCP and UDP port numbers */
227#define OCON_NETIF 3 /* network interfaces */
228#define OCON_NODE 4 /* nodes */
229#define OCON_FSUSE 5 /* fs_use */
230#define OCON_NODE6 6 /* IPv6 nodes */
231#define OCON_IBPKEY 7 /* Infiniband PKeys */
232#define OCON_IBENDPORT 8 /* Infiniband end ports */
233#define OCON_NUM 9
234
235/* The policy database */
236struct policydb {
237 int mls_enabled;
238
239 /* symbol tables */
240 struct symtab symtab[SYM_NUM];
241#define p_commons symtab[SYM_COMMONS]
242#define p_classes symtab[SYM_CLASSES]
243#define p_roles symtab[SYM_ROLES]
244#define p_types symtab[SYM_TYPES]
245#define p_users symtab[SYM_USERS]
246#define p_bools symtab[SYM_BOOLS]
247#define p_levels symtab[SYM_LEVELS]
248#define p_cats symtab[SYM_CATS]
249
250 /* symbol names indexed by (value - 1) */
251 char **sym_val_to_name[SYM_NUM];
252
253 /* class, role, and user attributes indexed by (value - 1) */
254 struct class_datum **class_val_to_struct;
255 struct role_datum **role_val_to_struct;
256 struct user_datum **user_val_to_struct;
257 struct type_datum **type_val_to_struct;
258
259 /* type enforcement access vectors and transitions */
260 struct avtab te_avtab;
261
262 /* role transitions */
263 struct hashtab role_tr;
264
265 /* file transitions with the last path component */
266 /* quickly exclude lookups when parent ttype has no rules */
267 struct ebitmap filename_trans_ttypes;
268 /* actual set of filename_trans rules */
269 struct hashtab filename_trans;
270 /* only used if policyvers < POLICYDB_VERSION_COMP_FTRANS */
271 u32 compat_filename_trans_count;
272
273 /* bools indexed by (value - 1) */
274 struct cond_bool_datum **bool_val_to_struct;
275 /* type enforcement conditional access vectors and transitions */
276 struct avtab te_cond_avtab;
277 /* array indexing te_cond_avtab by conditional */
278 struct cond_node *cond_list;
279 u32 cond_list_len;
280
281 /* role allows */
282 struct role_allow *role_allow;
283
284 /* security contexts of initial SIDs, unlabeled file systems,
285 TCP or UDP port numbers, network interfaces and nodes */
286 struct ocontext *ocontexts[OCON_NUM];
287
288 /* security contexts for files in filesystems that cannot support
289 a persistent label mapping or use another
290 fixed labeling behavior. */
291 struct genfs *genfs;
292
293 /* range transitions table (range_trans_key -> mls_range) */
294 struct hashtab range_tr;
295
296 /* type -> attribute reverse mapping */
297 struct ebitmap *type_attr_map_array;
298
299 struct ebitmap policycaps;
300
301 struct ebitmap permissive_map;
302
303 /* length of this policy when it was loaded */
304 size_t len;
305
306 unsigned int policyvers;
307
308 unsigned int reject_unknown : 1;
309 unsigned int allow_unknown : 1;
310
311 u16 process_class;
312 u32 process_trans_perms;
313} __randomize_layout;
314
315extern void policydb_destroy(struct policydb *p);
316extern int policydb_load_isids(struct policydb *p, struct sidtab *s);
317extern int policydb_context_isvalid(struct policydb *p, struct context *c);
318extern int policydb_class_isvalid(struct policydb *p, unsigned int class);
319extern int policydb_type_isvalid(struct policydb *p, unsigned int type);
320extern int policydb_role_isvalid(struct policydb *p, unsigned int role);
321extern int policydb_read(struct policydb *p, void *fp);
322extern int policydb_write(struct policydb *p, void *fp);
323
324extern struct filename_trans_datum *
325policydb_filenametr_search(struct policydb *p, struct filename_trans_key *key);
326
327extern struct mls_range *policydb_rangetr_search(struct policydb *p,
328 struct range_trans *key);
329
330extern struct role_trans_datum *
331policydb_roletr_search(struct policydb *p, struct role_trans_key *key);
332
333#define POLICYDB_CONFIG_MLS 1
334
335/* the config flags related to unknown classes/perms are bits 2 and 3 */
336#define REJECT_UNKNOWN 0x00000002
337#define ALLOW_UNKNOWN 0x00000004
338
339#define OBJECT_R "object_r"
340#define OBJECT_R_VAL 1
341
342#define POLICYDB_MAGIC SELINUX_MAGIC
343#define POLICYDB_STRING "SE Linux"
344
345struct policy_file {
346 char *data;
347 size_t len;
348};
349
350struct policy_data {
351 struct policydb *p;
352 void *fp;
353};
354
355static inline int next_entry(void *buf, struct policy_file *fp, size_t bytes)
356{
357 if (bytes > fp->len)
358 return -EINVAL;
359
360 memcpy(buf, fp->data, bytes);
361 fp->data += bytes;
362 fp->len -= bytes;
363 return 0;
364}
365
366static inline int put_entry(const void *buf, size_t bytes, size_t num,
367 struct policy_file *fp)
368{
369 size_t len;
370
371 if (unlikely(check_mul_overflow(bytes, num, &len)))
372 return -EINVAL;
373
374 if (len > fp->len)
375 return -EINVAL;
376 memcpy(fp->data, buf, len);
377 fp->data += len;
378 fp->len -= len;
379
380 return 0;
381}
382
383static inline char *sym_name(struct policydb *p, unsigned int sym_num,
384 unsigned int element_nr)
385{
386 return p->sym_val_to_name[sym_num][element_nr];
387}
388
389extern u16 string_to_security_class(struct policydb *p, const char *name);
390extern u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name);
391
392#endif /* _SS_POLICYDB_H_ */