1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Security server interface.
4 *
5 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
6 *
7 */
8
9 #ifndef _SELINUX_SECURITY_H_
10 #define _SELINUX_SECURITY_H_
11
12 #include <linux/compiler.h>
13 #include <linux/dcache.h>
14 #include <linux/magic.h>
15 #include <linux/types.h>
16 #include <linux/rcupdate.h>
17 #include <linux/refcount.h>
18 #include <linux/workqueue.h>
19 #include "flask.h"
20 #include "policycap.h"
21
22 #define SECSID_NULL 0x00000000 /* unspecified SID */
23 #define SECSID_WILD 0xffffffff /* wildcard SID */
24 #define SECCLASS_NULL 0x0000 /* no class */
25
26 /* Identify specific policy version changes */
27 #define POLICYDB_VERSION_BASE 15
28 #define POLICYDB_VERSION_BOOL 16
29 #define POLICYDB_VERSION_IPV6 17
30 #define POLICYDB_VERSION_NLCLASS 18
31 #define POLICYDB_VERSION_VALIDATETRANS 19
32 #define POLICYDB_VERSION_MLS 19
33 #define POLICYDB_VERSION_AVTAB 20
34 #define POLICYDB_VERSION_RANGETRANS 21
35 #define POLICYDB_VERSION_POLCAP 22
36 #define POLICYDB_VERSION_PERMISSIVE 23
37 #define POLICYDB_VERSION_BOUNDARY 24
38 #define POLICYDB_VERSION_FILENAME_TRANS 25
39 #define POLICYDB_VERSION_ROLETRANS 26
40 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
41 #define POLICYDB_VERSION_DEFAULT_TYPE 28
42 #define POLICYDB_VERSION_CONSTRAINT_NAMES 29
43 #define POLICYDB_VERSION_XPERMS_IOCTL 30
44 #define POLICYDB_VERSION_INFINIBAND 31
45 #define POLICYDB_VERSION_GLBLUB 32
46 #define POLICYDB_VERSION_COMP_FTRANS 33 /* compressed filename transitions */
47
48 /* Range of policy versions we understand*/
49 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
50 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_COMP_FTRANS
51
52 /* Mask for just the mount related flags */
53 #define SE_MNTMASK 0x0f
54 /* Super block security struct flags for mount options */
55 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
56 #define CONTEXT_MNT 0x01
57 #define FSCONTEXT_MNT 0x02
58 #define ROOTCONTEXT_MNT 0x04
59 #define DEFCONTEXT_MNT 0x08
60 #define SBLABEL_MNT 0x10
61 /* Non-mount related flags */
62 #define SE_SBINITIALIZED 0x0100
63 #define SE_SBPROC 0x0200
64 #define SE_SBGENFS 0x0400
65 #define SE_SBGENFS_XATTR 0x0800
66
67 #define CONTEXT_STR "context"
68 #define FSCONTEXT_STR "fscontext"
69 #define ROOTCONTEXT_STR "rootcontext"
70 #define DEFCONTEXT_STR "defcontext"
71 #define SECLABEL_STR "seclabel"
72
73 struct netlbl_lsm_secattr;
74
75 extern int selinux_enabled_boot;
76
77 /*
78 * type_datum properties
79 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
80 */
81 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
82 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
83
84 /* limitation of boundary depth */
85 #define POLICYDB_BOUNDS_MAXDEPTH 4
86
87 struct selinux_avc;
88 struct selinux_policy;
89
90 struct selinux_state {
91 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
92 bool disabled;
93 #endif
94 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
95 bool enforcing;
96 #endif
97 bool checkreqprot;
98 bool initialized;
99 bool policycap[__POLICYDB_CAPABILITY_MAX];
100 bool android_netlink_route;
101 bool android_netlink_getneigh;
102
103 struct page *status_page;
104 struct mutex status_lock;
105
106 struct selinux_avc *avc;
107 struct selinux_policy __rcu *policy;
108 struct mutex policy_mutex;
109 } __randomize_layout;
110
111 void selinux_avc_init(struct selinux_avc **avc);
112
113 extern struct selinux_state selinux_state;
114
selinux_initialized(const struct selinux_state * state)115 static inline bool selinux_initialized(const struct selinux_state *state)
116 {
117 /* do a synchronized load to avoid race conditions */
118 return smp_load_acquire(&state->initialized);
119 }
120
selinux_mark_initialized(struct selinux_state * state)121 static inline void selinux_mark_initialized(struct selinux_state *state)
122 {
123 /* do a synchronized write to avoid race conditions */
124 smp_store_release(&state->initialized, true);
125 }
126
127 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
enforcing_enabled(struct selinux_state * state)128 static inline bool enforcing_enabled(struct selinux_state *state)
129 {
130 return READ_ONCE(state->enforcing);
131 }
132
enforcing_set(struct selinux_state * state,bool value)133 static inline void enforcing_set(struct selinux_state *state, bool value)
134 {
135 WRITE_ONCE(state->enforcing, value);
136 }
137 #else
enforcing_enabled(struct selinux_state * state)138 static inline bool enforcing_enabled(struct selinux_state *state)
139 {
140 return true;
141 }
142
enforcing_set(struct selinux_state * state,bool value)143 static inline void enforcing_set(struct selinux_state *state, bool value)
144 {
145 }
146 #endif
147
checkreqprot_get(const struct selinux_state * state)148 static inline bool checkreqprot_get(const struct selinux_state *state)
149 {
150 return READ_ONCE(state->checkreqprot);
151 }
152
checkreqprot_set(struct selinux_state * state,bool value)153 static inline void checkreqprot_set(struct selinux_state *state, bool value)
154 {
155 WRITE_ONCE(state->checkreqprot, value);
156 }
157
158 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
selinux_disabled(struct selinux_state * state)159 static inline bool selinux_disabled(struct selinux_state *state)
160 {
161 return READ_ONCE(state->disabled);
162 }
163
selinux_mark_disabled(struct selinux_state * state)164 static inline void selinux_mark_disabled(struct selinux_state *state)
165 {
166 WRITE_ONCE(state->disabled, true);
167 }
168 #else
selinux_disabled(struct selinux_state * state)169 static inline bool selinux_disabled(struct selinux_state *state)
170 {
171 return false;
172 }
173 #endif
174
selinux_policycap_netpeer(void)175 static inline bool selinux_policycap_netpeer(void)
176 {
177 struct selinux_state *state = &selinux_state;
178
179 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NETPEER]);
180 }
181
selinux_policycap_openperm(void)182 static inline bool selinux_policycap_openperm(void)
183 {
184 struct selinux_state *state = &selinux_state;
185
186 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_OPENPERM]);
187 }
188
selinux_policycap_extsockclass(void)189 static inline bool selinux_policycap_extsockclass(void)
190 {
191 struct selinux_state *state = &selinux_state;
192
193 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS]);
194 }
195
selinux_policycap_alwaysnetwork(void)196 static inline bool selinux_policycap_alwaysnetwork(void)
197 {
198 struct selinux_state *state = &selinux_state;
199
200 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK]);
201 }
202
selinux_policycap_cgroupseclabel(void)203 static inline bool selinux_policycap_cgroupseclabel(void)
204 {
205 struct selinux_state *state = &selinux_state;
206
207 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL]);
208 }
209
selinux_policycap_nnp_nosuid_transition(void)210 static inline bool selinux_policycap_nnp_nosuid_transition(void)
211 {
212 struct selinux_state *state = &selinux_state;
213
214 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION]);
215 }
216
selinux_policycap_genfs_seclabel_symlinks(void)217 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
218 {
219 struct selinux_state *state = &selinux_state;
220
221 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS]);
222 }
223
selinux_policycap_ioctl_skip_cloexec(void)224 static inline bool selinux_policycap_ioctl_skip_cloexec(void)
225 {
226 struct selinux_state *state = &selinux_state;
227
228 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_IOCTL_SKIP_CLOEXEC]);
229 }
230
selinux_android_nlroute_getlink(void)231 static inline bool selinux_android_nlroute_getlink(void)
232 {
233 struct selinux_state *state = &selinux_state;
234
235 return state->android_netlink_route;
236 }
237
selinux_android_nlroute_getneigh(void)238 static inline bool selinux_android_nlroute_getneigh(void)
239 {
240 struct selinux_state *state = &selinux_state;
241
242 return state->android_netlink_getneigh;
243 }
244
245 struct selinux_policy_convert_data;
246
247 struct selinux_load_state {
248 struct selinux_policy *policy;
249 struct selinux_policy_convert_data *convert_data;
250 };
251
252 int security_mls_enabled(struct selinux_state *state);
253 int security_load_policy(struct selinux_state *state,
254 void *data, size_t len,
255 struct selinux_load_state *load_state);
256 void selinux_policy_commit(struct selinux_state *state,
257 struct selinux_load_state *load_state);
258 void selinux_policy_cancel(struct selinux_state *state,
259 struct selinux_load_state *load_state);
260 int security_read_policy(struct selinux_state *state,
261 void **data, size_t *len);
262 int security_read_state_kernel(struct selinux_state *state,
263 void **data, size_t *len);
264 int security_policycap_supported(struct selinux_state *state,
265 unsigned int req_cap);
266
267 #define SEL_VEC_MAX 32
268 struct av_decision {
269 u32 allowed;
270 u32 auditallow;
271 u32 auditdeny;
272 u32 seqno;
273 u32 flags;
274 };
275
276 #define XPERMS_ALLOWED 1
277 #define XPERMS_AUDITALLOW 2
278 #define XPERMS_DONTAUDIT 4
279
280 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
281 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
282 struct extended_perms_data {
283 u32 p[8];
284 };
285
286 struct extended_perms_decision {
287 u8 used;
288 u8 driver;
289 struct extended_perms_data *allowed;
290 struct extended_perms_data *auditallow;
291 struct extended_perms_data *dontaudit;
292 };
293
294 struct extended_perms {
295 u16 len; /* length associated decision chain */
296 struct extended_perms_data drivers; /* flag drivers that are used */
297 };
298
299 /* definitions of av_decision.flags */
300 #define AVD_FLAGS_PERMISSIVE 0x0001
301
302 void security_compute_av(struct selinux_state *state,
303 u32 ssid, u32 tsid,
304 u16 tclass, struct av_decision *avd,
305 struct extended_perms *xperms);
306
307 void security_compute_xperms_decision(struct selinux_state *state,
308 u32 ssid, u32 tsid, u16 tclass,
309 u8 driver,
310 struct extended_perms_decision *xpermd);
311
312 void security_compute_av_user(struct selinux_state *state,
313 u32 ssid, u32 tsid,
314 u16 tclass, struct av_decision *avd);
315
316 int security_transition_sid(struct selinux_state *state,
317 u32 ssid, u32 tsid, u16 tclass,
318 const struct qstr *qstr, u32 *out_sid);
319
320 int security_transition_sid_user(struct selinux_state *state,
321 u32 ssid, u32 tsid, u16 tclass,
322 const char *objname, u32 *out_sid);
323
324 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
325 u16 tclass, u32 *out_sid);
326
327 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
328 u16 tclass, u32 *out_sid);
329
330 int security_sid_to_context(struct selinux_state *state, u32 sid,
331 char **scontext, u32 *scontext_len);
332
333 int security_sid_to_context_force(struct selinux_state *state,
334 u32 sid, char **scontext, u32 *scontext_len);
335
336 int security_sid_to_context_inval(struct selinux_state *state,
337 u32 sid, char **scontext, u32 *scontext_len);
338
339 int security_context_to_sid(struct selinux_state *state,
340 const char *scontext, u32 scontext_len,
341 u32 *out_sid, gfp_t gfp);
342
343 int security_context_str_to_sid(struct selinux_state *state,
344 const char *scontext, u32 *out_sid, gfp_t gfp);
345
346 int security_context_to_sid_default(struct selinux_state *state,
347 const char *scontext, u32 scontext_len,
348 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
349
350 int security_context_to_sid_force(struct selinux_state *state,
351 const char *scontext, u32 scontext_len,
352 u32 *sid);
353
354 int security_get_user_sids(struct selinux_state *state,
355 u32 callsid, char *username,
356 u32 **sids, u32 *nel);
357
358 int security_port_sid(struct selinux_state *state,
359 u8 protocol, u16 port, u32 *out_sid);
360
361 int security_ib_pkey_sid(struct selinux_state *state,
362 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
363
364 int security_ib_endport_sid(struct selinux_state *state,
365 const char *dev_name, u8 port_num, u32 *out_sid);
366
367 int security_netif_sid(struct selinux_state *state,
368 char *name, u32 *if_sid);
369
370 int security_node_sid(struct selinux_state *state,
371 u16 domain, void *addr, u32 addrlen,
372 u32 *out_sid);
373
374 int security_validate_transition(struct selinux_state *state,
375 u32 oldsid, u32 newsid, u32 tasksid,
376 u16 tclass);
377
378 int security_validate_transition_user(struct selinux_state *state,
379 u32 oldsid, u32 newsid, u32 tasksid,
380 u16 tclass);
381
382 int security_bounded_transition(struct selinux_state *state,
383 u32 oldsid, u32 newsid);
384
385 int security_sid_mls_copy(struct selinux_state *state,
386 u32 sid, u32 mls_sid, u32 *new_sid);
387
388 int security_net_peersid_resolve(struct selinux_state *state,
389 u32 nlbl_sid, u32 nlbl_type,
390 u32 xfrm_sid,
391 u32 *peer_sid);
392
393 int security_get_classes(struct selinux_policy *policy,
394 char ***classes, int *nclasses);
395 int security_get_permissions(struct selinux_policy *policy,
396 char *class, char ***perms, int *nperms);
397 int security_get_reject_unknown(struct selinux_state *state);
398 int security_get_allow_unknown(struct selinux_state *state);
399
400 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
401 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
402 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
403 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
404 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
405 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
406 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
407 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
408
409 int security_fs_use(struct selinux_state *state, struct super_block *sb);
410
411 int security_genfs_sid(struct selinux_state *state,
412 const char *fstype, char *name, u16 sclass,
413 u32 *sid);
414
415 int selinux_policy_genfs_sid(struct selinux_policy *policy,
416 const char *fstype, char *name, u16 sclass,
417 u32 *sid);
418
419 #ifdef CONFIG_NETLABEL
420 int security_netlbl_secattr_to_sid(struct selinux_state *state,
421 struct netlbl_lsm_secattr *secattr,
422 u32 *sid);
423
424 int security_netlbl_sid_to_secattr(struct selinux_state *state,
425 u32 sid,
426 struct netlbl_lsm_secattr *secattr);
427 #else
security_netlbl_secattr_to_sid(struct selinux_state * state,struct netlbl_lsm_secattr * secattr,u32 * sid)428 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
429 struct netlbl_lsm_secattr *secattr,
430 u32 *sid)
431 {
432 return -EIDRM;
433 }
434
security_netlbl_sid_to_secattr(struct selinux_state * state,u32 sid,struct netlbl_lsm_secattr * secattr)435 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
436 u32 sid,
437 struct netlbl_lsm_secattr *secattr)
438 {
439 return -ENOENT;
440 }
441 #endif /* CONFIG_NETLABEL */
442
443 const char *security_get_initial_sid_context(u32 sid);
444
445 /*
446 * status notifier using mmap interface
447 */
448 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
449
450 #define SELINUX_KERNEL_STATUS_VERSION 1
451 struct selinux_kernel_status {
452 u32 version; /* version number of the structure */
453 u32 sequence; /* sequence number of seqlock logic */
454 u32 enforcing; /* current setting of enforcing mode */
455 u32 policyload; /* times of policy reloaded */
456 u32 deny_unknown; /* current setting of deny_unknown */
457 /*
458 * The version > 0 supports above members.
459 */
460 } __packed;
461
462 extern void selinux_status_update_setenforce(struct selinux_state *state,
463 int enforcing);
464 extern void selinux_status_update_policyload(struct selinux_state *state,
465 int seqno);
466 extern void selinux_complete_init(void);
467 extern int selinux_disable(struct selinux_state *state);
468 extern void exit_sel_fs(void);
469 extern struct path selinux_null;
470 extern void selnl_notify_setenforce(int val);
471 extern void selnl_notify_policyload(u32 seqno);
472 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
473
474 extern void avtab_cache_init(void);
475 extern void ebitmap_cache_init(void);
476 extern void hashtab_cache_init(void);
477 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
478 extern void selinux_nlmsg_init(void);
479
480 #endif /* _SELINUX_SECURITY_H_ */
481