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 <linux/delay.h>
20 #include <linux/printk.h>
21 #include "flask.h"
22 #include "policycap.h"
23
24 #define SECSID_NULL 0x00000000 /* unspecified SID */
25 #define SECSID_WILD 0xffffffff /* wildcard SID */
26 #define SECCLASS_NULL 0x0000 /* no class */
27
28 /* Identify specific policy version changes */
29 #define POLICYDB_VERSION_BASE 15
30 #define POLICYDB_VERSION_BOOL 16
31 #define POLICYDB_VERSION_IPV6 17
32 #define POLICYDB_VERSION_NLCLASS 18
33 #define POLICYDB_VERSION_VALIDATETRANS 19
34 #define POLICYDB_VERSION_MLS 19
35 #define POLICYDB_VERSION_AVTAB 20
36 #define POLICYDB_VERSION_RANGETRANS 21
37 #define POLICYDB_VERSION_POLCAP 22
38 #define POLICYDB_VERSION_PERMISSIVE 23
39 #define POLICYDB_VERSION_BOUNDARY 24
40 #define POLICYDB_VERSION_FILENAME_TRANS 25
41 #define POLICYDB_VERSION_ROLETRANS 26
42 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
43 #define POLICYDB_VERSION_DEFAULT_TYPE 28
44 #define POLICYDB_VERSION_CONSTRAINT_NAMES 29
45 #define POLICYDB_VERSION_XPERMS_IOCTL 30
46 #define POLICYDB_VERSION_INFINIBAND 31
47 #define POLICYDB_VERSION_GLBLUB 32
48 #define POLICYDB_VERSION_COMP_FTRANS 33 /* compressed filename transitions */
49
50 /* Range of policy versions we understand*/
51 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
52 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_COMP_FTRANS
53
54 /* Mask for just the mount related flags */
55 #define SE_MNTMASK 0x0f
56 /* Super block security struct flags for mount options */
57 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
58 #define CONTEXT_MNT 0x01
59 #define FSCONTEXT_MNT 0x02
60 #define ROOTCONTEXT_MNT 0x04
61 #define DEFCONTEXT_MNT 0x08
62 #define SBLABEL_MNT 0x10
63 /* Non-mount related flags */
64 #define SE_SBINITIALIZED 0x0100
65 #define SE_SBPROC 0x0200
66 #define SE_SBGENFS 0x0400
67 #define SE_SBGENFS_XATTR 0x0800
68
69 #define CONTEXT_STR "context"
70 #define FSCONTEXT_STR "fscontext"
71 #define ROOTCONTEXT_STR "rootcontext"
72 #define DEFCONTEXT_STR "defcontext"
73 #define SECLABEL_STR "seclabel"
74
75 struct netlbl_lsm_secattr;
76
77 extern int selinux_enabled_boot;
78
79 /*
80 * type_datum properties
81 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
82 */
83 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
84 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
85
86 /* limitation of boundary depth */
87 #define POLICYDB_BOUNDS_MAXDEPTH 4
88
89 struct selinux_avc;
90 struct selinux_policy;
91
92 struct selinux_state {
93 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
94 bool disabled;
95 #endif
96 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
97 bool enforcing;
98 #endif
99 bool checkreqprot;
100 bool initialized;
101 bool policycap[__POLICYDB_CAP_MAX];
102 bool android_netlink_route;
103 bool android_netlink_getneigh;
104
105 struct page *status_page;
106 struct mutex status_lock;
107
108 struct selinux_avc *avc;
109 struct selinux_policy __rcu *policy;
110 struct mutex policy_mutex;
111 } __randomize_layout;
112
113 void selinux_avc_init(struct selinux_avc **avc);
114
115 extern struct selinux_state selinux_state;
116
selinux_initialized(const struct selinux_state * state)117 static inline bool selinux_initialized(const struct selinux_state *state)
118 {
119 /* do a synchronized load to avoid race conditions */
120 return smp_load_acquire(&state->initialized);
121 }
122
selinux_mark_initialized(struct selinux_state * state)123 static inline void selinux_mark_initialized(struct selinux_state *state)
124 {
125 /* do a synchronized write to avoid race conditions */
126 smp_store_release(&state->initialized, true);
127 }
128
129 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
enforcing_enabled(struct selinux_state * state)130 static inline bool enforcing_enabled(struct selinux_state *state)
131 {
132 return READ_ONCE(state->enforcing);
133 }
134
enforcing_set(struct selinux_state * state,bool value)135 static inline void enforcing_set(struct selinux_state *state, bool value)
136 {
137 WRITE_ONCE(state->enforcing, value);
138 }
139 #else
enforcing_enabled(struct selinux_state * state)140 static inline bool enforcing_enabled(struct selinux_state *state)
141 {
142 return true;
143 }
144
enforcing_set(struct selinux_state * state,bool value)145 static inline void enforcing_set(struct selinux_state *state, bool value)
146 {
147 }
148 #endif
149
checkreqprot_get(const struct selinux_state * state)150 static inline bool checkreqprot_get(const struct selinux_state *state)
151 {
152 return READ_ONCE(state->checkreqprot);
153 }
154
checkreqprot_set(struct selinux_state * state,bool value)155 static inline void checkreqprot_set(struct selinux_state *state, bool value)
156 {
157 if (value)
158 pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-checkreqprot\n");
159 WRITE_ONCE(state->checkreqprot, value);
160 }
161
162 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
selinux_disabled(struct selinux_state * state)163 static inline bool selinux_disabled(struct selinux_state *state)
164 {
165 return READ_ONCE(state->disabled);
166 }
167
selinux_mark_disabled(struct selinux_state * state)168 static inline void selinux_mark_disabled(struct selinux_state *state)
169 {
170 WRITE_ONCE(state->disabled, true);
171 }
172 #else
selinux_disabled(struct selinux_state * state)173 static inline bool selinux_disabled(struct selinux_state *state)
174 {
175 return false;
176 }
177 #endif
178
selinux_policycap_netpeer(void)179 static inline bool selinux_policycap_netpeer(void)
180 {
181 struct selinux_state *state = &selinux_state;
182
183 return READ_ONCE(state->policycap[POLICYDB_CAP_NETPEER]);
184 }
185
selinux_policycap_openperm(void)186 static inline bool selinux_policycap_openperm(void)
187 {
188 struct selinux_state *state = &selinux_state;
189
190 return READ_ONCE(state->policycap[POLICYDB_CAP_OPENPERM]);
191 }
192
selinux_policycap_extsockclass(void)193 static inline bool selinux_policycap_extsockclass(void)
194 {
195 struct selinux_state *state = &selinux_state;
196
197 return READ_ONCE(state->policycap[POLICYDB_CAP_EXTSOCKCLASS]);
198 }
199
selinux_policycap_alwaysnetwork(void)200 static inline bool selinux_policycap_alwaysnetwork(void)
201 {
202 struct selinux_state *state = &selinux_state;
203
204 return READ_ONCE(state->policycap[POLICYDB_CAP_ALWAYSNETWORK]);
205 }
206
selinux_policycap_cgroupseclabel(void)207 static inline bool selinux_policycap_cgroupseclabel(void)
208 {
209 struct selinux_state *state = &selinux_state;
210
211 return READ_ONCE(state->policycap[POLICYDB_CAP_CGROUPSECLABEL]);
212 }
213
selinux_policycap_nnp_nosuid_transition(void)214 static inline bool selinux_policycap_nnp_nosuid_transition(void)
215 {
216 struct selinux_state *state = &selinux_state;
217
218 return READ_ONCE(state->policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
219 }
220
selinux_policycap_genfs_seclabel_symlinks(void)221 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
222 {
223 struct selinux_state *state = &selinux_state;
224
225 return READ_ONCE(state->policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
226 }
227
selinux_policycap_ioctl_skip_cloexec(void)228 static inline bool selinux_policycap_ioctl_skip_cloexec(void)
229 {
230 struct selinux_state *state = &selinux_state;
231
232 return READ_ONCE(state->policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
233 }
234
selinux_android_nlroute_getlink(void)235 static inline bool selinux_android_nlroute_getlink(void)
236 {
237 struct selinux_state *state = &selinux_state;
238
239 return state->android_netlink_route;
240 }
241
selinux_android_nlroute_getneigh(void)242 static inline bool selinux_android_nlroute_getneigh(void)
243 {
244 struct selinux_state *state = &selinux_state;
245
246 return state->android_netlink_getneigh;
247 }
248
249 struct selinux_policy_convert_data;
250
251 struct selinux_load_state {
252 struct selinux_policy *policy;
253 struct selinux_policy_convert_data *convert_data;
254 };
255
256 int security_mls_enabled(struct selinux_state *state);
257 int security_load_policy(struct selinux_state *state,
258 void *data, size_t len,
259 struct selinux_load_state *load_state);
260 void selinux_policy_commit(struct selinux_state *state,
261 struct selinux_load_state *load_state);
262 void selinux_policy_cancel(struct selinux_state *state,
263 struct selinux_load_state *load_state);
264 int security_read_policy(struct selinux_state *state,
265 void **data, size_t *len);
266 int security_read_state_kernel(struct selinux_state *state,
267 void **data, size_t *len);
268 int security_policycap_supported(struct selinux_state *state,
269 unsigned int req_cap);
270
271 #define SEL_VEC_MAX 32
272 struct av_decision {
273 u32 allowed;
274 u32 auditallow;
275 u32 auditdeny;
276 u32 seqno;
277 u32 flags;
278 };
279
280 #define XPERMS_ALLOWED 1
281 #define XPERMS_AUDITALLOW 2
282 #define XPERMS_DONTAUDIT 4
283
284 #define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x) & 0x1f))
285 #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x) & 0x1f)))
286 struct extended_perms_data {
287 u32 p[8];
288 };
289
290 struct extended_perms_decision {
291 u8 used;
292 u8 driver;
293 struct extended_perms_data *allowed;
294 struct extended_perms_data *auditallow;
295 struct extended_perms_data *dontaudit;
296 };
297
298 struct extended_perms {
299 u16 len; /* length associated decision chain */
300 struct extended_perms_data drivers; /* flag drivers that are used */
301 };
302
303 /* definitions of av_decision.flags */
304 #define AVD_FLAGS_PERMISSIVE 0x0001
305
306 void security_compute_av(struct selinux_state *state,
307 u32 ssid, u32 tsid,
308 u16 tclass, struct av_decision *avd,
309 struct extended_perms *xperms);
310
311 void security_compute_xperms_decision(struct selinux_state *state,
312 u32 ssid, u32 tsid, u16 tclass,
313 u8 driver,
314 struct extended_perms_decision *xpermd);
315
316 void security_compute_av_user(struct selinux_state *state,
317 u32 ssid, u32 tsid,
318 u16 tclass, struct av_decision *avd);
319
320 int security_transition_sid(struct selinux_state *state,
321 u32 ssid, u32 tsid, u16 tclass,
322 const struct qstr *qstr, u32 *out_sid);
323
324 int security_transition_sid_user(struct selinux_state *state,
325 u32 ssid, u32 tsid, u16 tclass,
326 const char *objname, u32 *out_sid);
327
328 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
329 u16 tclass, u32 *out_sid);
330
331 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
332 u16 tclass, u32 *out_sid);
333
334 int security_sid_to_context(struct selinux_state *state, u32 sid,
335 char **scontext, u32 *scontext_len);
336
337 int security_sid_to_context_force(struct selinux_state *state,
338 u32 sid, char **scontext, u32 *scontext_len);
339
340 int security_sid_to_context_inval(struct selinux_state *state,
341 u32 sid, char **scontext, u32 *scontext_len);
342
343 int security_context_to_sid(struct selinux_state *state,
344 const char *scontext, u32 scontext_len,
345 u32 *out_sid, gfp_t gfp);
346
347 int security_context_str_to_sid(struct selinux_state *state,
348 const char *scontext, u32 *out_sid, gfp_t gfp);
349
350 int security_context_to_sid_default(struct selinux_state *state,
351 const char *scontext, u32 scontext_len,
352 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
353
354 int security_context_to_sid_force(struct selinux_state *state,
355 const char *scontext, u32 scontext_len,
356 u32 *sid);
357
358 int security_get_user_sids(struct selinux_state *state,
359 u32 callsid, char *username,
360 u32 **sids, u32 *nel);
361
362 int security_port_sid(struct selinux_state *state,
363 u8 protocol, u16 port, u32 *out_sid);
364
365 int security_ib_pkey_sid(struct selinux_state *state,
366 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
367
368 int security_ib_endport_sid(struct selinux_state *state,
369 const char *dev_name, u8 port_num, u32 *out_sid);
370
371 int security_netif_sid(struct selinux_state *state,
372 char *name, u32 *if_sid);
373
374 int security_node_sid(struct selinux_state *state,
375 u16 domain, void *addr, u32 addrlen,
376 u32 *out_sid);
377
378 int security_validate_transition(struct selinux_state *state,
379 u32 oldsid, u32 newsid, u32 tasksid,
380 u16 tclass);
381
382 int security_validate_transition_user(struct selinux_state *state,
383 u32 oldsid, u32 newsid, u32 tasksid,
384 u16 tclass);
385
386 int security_bounded_transition(struct selinux_state *state,
387 u32 oldsid, u32 newsid);
388
389 int security_sid_mls_copy(struct selinux_state *state,
390 u32 sid, u32 mls_sid, u32 *new_sid);
391
392 int security_net_peersid_resolve(struct selinux_state *state,
393 u32 nlbl_sid, u32 nlbl_type,
394 u32 xfrm_sid,
395 u32 *peer_sid);
396
397 int security_get_classes(struct selinux_policy *policy,
398 char ***classes, int *nclasses);
399 int security_get_permissions(struct selinux_policy *policy,
400 char *class, char ***perms, int *nperms);
401 int security_get_reject_unknown(struct selinux_state *state);
402 int security_get_allow_unknown(struct selinux_state *state);
403
404 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
405 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
406 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
407 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
408 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
409 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
410 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
411 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
412
413 int security_fs_use(struct selinux_state *state, struct super_block *sb);
414
415 int security_genfs_sid(struct selinux_state *state,
416 const char *fstype, const char *path, u16 sclass,
417 u32 *sid);
418
419 int selinux_policy_genfs_sid(struct selinux_policy *policy,
420 const char *fstype, const char *path, u16 sclass,
421 u32 *sid);
422
423 #ifdef CONFIG_NETLABEL
424 int security_netlbl_secattr_to_sid(struct selinux_state *state,
425 struct netlbl_lsm_secattr *secattr,
426 u32 *sid);
427
428 int security_netlbl_sid_to_secattr(struct selinux_state *state,
429 u32 sid,
430 struct netlbl_lsm_secattr *secattr);
431 #else
security_netlbl_secattr_to_sid(struct selinux_state * state,struct netlbl_lsm_secattr * secattr,u32 * sid)432 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
433 struct netlbl_lsm_secattr *secattr,
434 u32 *sid)
435 {
436 return -EIDRM;
437 }
438
security_netlbl_sid_to_secattr(struct selinux_state * state,u32 sid,struct netlbl_lsm_secattr * secattr)439 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
440 u32 sid,
441 struct netlbl_lsm_secattr *secattr)
442 {
443 return -ENOENT;
444 }
445 #endif /* CONFIG_NETLABEL */
446
447 const char *security_get_initial_sid_context(u32 sid);
448
449 /*
450 * status notifier using mmap interface
451 */
452 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
453
454 #define SELINUX_KERNEL_STATUS_VERSION 1
455 struct selinux_kernel_status {
456 u32 version; /* version number of the structure */
457 u32 sequence; /* sequence number of seqlock logic */
458 u32 enforcing; /* current setting of enforcing mode */
459 u32 policyload; /* times of policy reloaded */
460 u32 deny_unknown; /* current setting of deny_unknown */
461 /*
462 * The version > 0 supports above members.
463 */
464 } __packed;
465
466 extern void selinux_status_update_setenforce(struct selinux_state *state,
467 int enforcing);
468 extern void selinux_status_update_policyload(struct selinux_state *state,
469 int seqno);
470 extern void selinux_complete_init(void);
471 extern int selinux_disable(struct selinux_state *state);
472 extern void exit_sel_fs(void);
473 extern struct path selinux_null;
474 extern void selnl_notify_setenforce(int val);
475 extern void selnl_notify_policyload(u32 seqno);
476 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
477
478 extern void avtab_cache_init(void);
479 extern void ebitmap_cache_init(void);
480 extern void hashtab_cache_init(void);
481 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
482 extern void selinux_nlmsg_init(void);
483
484 #endif /* _SELINUX_SECURITY_H_ */
485