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
101 struct page *status_page;
102 struct mutex status_lock;
103
104 struct selinux_avc *avc;
105 struct selinux_policy __rcu *policy;
106 struct mutex policy_mutex;
107 } __randomize_layout;
108
109 void selinux_avc_init(struct selinux_avc **avc);
110
111 extern struct selinux_state selinux_state;
112
selinux_initialized(const struct selinux_state * state)113 static inline bool selinux_initialized(const struct selinux_state *state)
114 {
115 /* do a synchronized load to avoid race conditions */
116 return smp_load_acquire(&state->initialized);
117 }
118
selinux_mark_initialized(struct selinux_state * state)119 static inline void selinux_mark_initialized(struct selinux_state *state)
120 {
121 /* do a synchronized write to avoid race conditions */
122 smp_store_release(&state->initialized, true);
123 }
124
125 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
enforcing_enabled(struct selinux_state * state)126 static inline bool enforcing_enabled(struct selinux_state *state)
127 {
128 return READ_ONCE(state->enforcing);
129 }
130
enforcing_set(struct selinux_state * state,bool value)131 static inline void enforcing_set(struct selinux_state *state, bool value)
132 {
133 WRITE_ONCE(state->enforcing, value);
134 }
135 #else
enforcing_enabled(struct selinux_state * state)136 static inline bool enforcing_enabled(struct selinux_state *state)
137 {
138 return true;
139 }
140
enforcing_set(struct selinux_state * state,bool value)141 static inline void enforcing_set(struct selinux_state *state, bool value)
142 {
143 }
144 #endif
145
checkreqprot_get(const struct selinux_state * state)146 static inline bool checkreqprot_get(const struct selinux_state *state)
147 {
148 return READ_ONCE(state->checkreqprot);
149 }
150
checkreqprot_set(struct selinux_state * state,bool value)151 static inline void checkreqprot_set(struct selinux_state *state, bool value)
152 {
153 WRITE_ONCE(state->checkreqprot, value);
154 }
155
156 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
selinux_disabled(struct selinux_state * state)157 static inline bool selinux_disabled(struct selinux_state *state)
158 {
159 return READ_ONCE(state->disabled);
160 }
161
selinux_mark_disabled(struct selinux_state * state)162 static inline void selinux_mark_disabled(struct selinux_state *state)
163 {
164 WRITE_ONCE(state->disabled, true);
165 }
166 #else
selinux_disabled(struct selinux_state * state)167 static inline bool selinux_disabled(struct selinux_state *state)
168 {
169 return false;
170 }
171 #endif
172
selinux_policycap_netpeer(void)173 static inline bool selinux_policycap_netpeer(void)
174 {
175 struct selinux_state *state = &selinux_state;
176
177 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NETPEER]);
178 }
179
selinux_policycap_openperm(void)180 static inline bool selinux_policycap_openperm(void)
181 {
182 struct selinux_state *state = &selinux_state;
183
184 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_OPENPERM]);
185 }
186
selinux_policycap_extsockclass(void)187 static inline bool selinux_policycap_extsockclass(void)
188 {
189 struct selinux_state *state = &selinux_state;
190
191 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS]);
192 }
193
selinux_policycap_alwaysnetwork(void)194 static inline bool selinux_policycap_alwaysnetwork(void)
195 {
196 struct selinux_state *state = &selinux_state;
197
198 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK]);
199 }
200
selinux_policycap_cgroupseclabel(void)201 static inline bool selinux_policycap_cgroupseclabel(void)
202 {
203 struct selinux_state *state = &selinux_state;
204
205 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL]);
206 }
207
selinux_policycap_nnp_nosuid_transition(void)208 static inline bool selinux_policycap_nnp_nosuid_transition(void)
209 {
210 struct selinux_state *state = &selinux_state;
211
212 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION]);
213 }
214
selinux_policycap_genfs_seclabel_symlinks(void)215 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
216 {
217 struct selinux_state *state = &selinux_state;
218
219 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS]);
220 }
221
222 int security_mls_enabled(struct selinux_state *state);
223 int security_load_policy(struct selinux_state *state,
224 void *data, size_t len,
225 struct selinux_policy **newpolicyp);
226 void selinux_policy_commit(struct selinux_state *state,
227 struct selinux_policy *newpolicy);
228 void selinux_policy_cancel(struct selinux_state *state,
229 struct selinux_policy *policy);
230 int security_read_policy(struct selinux_state *state,
231 void **data, size_t *len);
232
233 int security_policycap_supported(struct selinux_state *state,
234 unsigned int req_cap);
235
236 #define SEL_VEC_MAX 32
237 struct av_decision {
238 u32 allowed;
239 u32 auditallow;
240 u32 auditdeny;
241 u32 seqno;
242 u32 flags;
243 };
244
245 #define XPERMS_ALLOWED 1
246 #define XPERMS_AUDITALLOW 2
247 #define XPERMS_DONTAUDIT 4
248
249 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
250 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
251 struct extended_perms_data {
252 u32 p[8];
253 };
254
255 struct extended_perms_decision {
256 u8 used;
257 u8 driver;
258 struct extended_perms_data *allowed;
259 struct extended_perms_data *auditallow;
260 struct extended_perms_data *dontaudit;
261 };
262
263 struct extended_perms {
264 u16 len; /* length associated decision chain */
265 struct extended_perms_data drivers; /* flag drivers that are used */
266 };
267
268 /* definitions of av_decision.flags */
269 #define AVD_FLAGS_PERMISSIVE 0x0001
270
271 void security_compute_av(struct selinux_state *state,
272 u32 ssid, u32 tsid,
273 u16 tclass, struct av_decision *avd,
274 struct extended_perms *xperms);
275
276 void security_compute_xperms_decision(struct selinux_state *state,
277 u32 ssid, u32 tsid, u16 tclass,
278 u8 driver,
279 struct extended_perms_decision *xpermd);
280
281 void security_compute_av_user(struct selinux_state *state,
282 u32 ssid, u32 tsid,
283 u16 tclass, struct av_decision *avd);
284
285 int security_transition_sid(struct selinux_state *state,
286 u32 ssid, u32 tsid, u16 tclass,
287 const struct qstr *qstr, u32 *out_sid);
288
289 int security_transition_sid_user(struct selinux_state *state,
290 u32 ssid, u32 tsid, u16 tclass,
291 const char *objname, u32 *out_sid);
292
293 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
294 u16 tclass, u32 *out_sid);
295
296 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
297 u16 tclass, u32 *out_sid);
298
299 int security_sid_to_context(struct selinux_state *state, u32 sid,
300 char **scontext, u32 *scontext_len);
301
302 int security_sid_to_context_force(struct selinux_state *state,
303 u32 sid, char **scontext, u32 *scontext_len);
304
305 int security_sid_to_context_inval(struct selinux_state *state,
306 u32 sid, char **scontext, u32 *scontext_len);
307
308 int security_context_to_sid(struct selinux_state *state,
309 const char *scontext, u32 scontext_len,
310 u32 *out_sid, gfp_t gfp);
311
312 int security_context_str_to_sid(struct selinux_state *state,
313 const char *scontext, u32 *out_sid, gfp_t gfp);
314
315 int security_context_to_sid_default(struct selinux_state *state,
316 const char *scontext, u32 scontext_len,
317 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
318
319 int security_context_to_sid_force(struct selinux_state *state,
320 const char *scontext, u32 scontext_len,
321 u32 *sid);
322
323 int security_get_user_sids(struct selinux_state *state,
324 u32 callsid, char *username,
325 u32 **sids, u32 *nel);
326
327 int security_port_sid(struct selinux_state *state,
328 u8 protocol, u16 port, u32 *out_sid);
329
330 int security_ib_pkey_sid(struct selinux_state *state,
331 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
332
333 int security_ib_endport_sid(struct selinux_state *state,
334 const char *dev_name, u8 port_num, u32 *out_sid);
335
336 int security_netif_sid(struct selinux_state *state,
337 char *name, u32 *if_sid);
338
339 int security_node_sid(struct selinux_state *state,
340 u16 domain, void *addr, u32 addrlen,
341 u32 *out_sid);
342
343 int security_validate_transition(struct selinux_state *state,
344 u32 oldsid, u32 newsid, u32 tasksid,
345 u16 tclass);
346
347 int security_validate_transition_user(struct selinux_state *state,
348 u32 oldsid, u32 newsid, u32 tasksid,
349 u16 tclass);
350
351 int security_bounded_transition(struct selinux_state *state,
352 u32 oldsid, u32 newsid);
353
354 int security_sid_mls_copy(struct selinux_state *state,
355 u32 sid, u32 mls_sid, u32 *new_sid);
356
357 int security_net_peersid_resolve(struct selinux_state *state,
358 u32 nlbl_sid, u32 nlbl_type,
359 u32 xfrm_sid,
360 u32 *peer_sid);
361
362 int security_get_classes(struct selinux_policy *policy,
363 char ***classes, int *nclasses);
364 int security_get_permissions(struct selinux_policy *policy,
365 char *class, char ***perms, int *nperms);
366 int security_get_reject_unknown(struct selinux_state *state);
367 int security_get_allow_unknown(struct selinux_state *state);
368
369 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
370 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
371 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
372 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
373 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
374 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
375 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
376 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
377
378 int security_fs_use(struct selinux_state *state, struct super_block *sb);
379
380 int security_genfs_sid(struct selinux_state *state,
381 const char *fstype, char *name, u16 sclass,
382 u32 *sid);
383
384 int selinux_policy_genfs_sid(struct selinux_policy *policy,
385 const char *fstype, char *name, u16 sclass,
386 u32 *sid);
387
388 #ifdef CONFIG_NETLABEL
389 int security_netlbl_secattr_to_sid(struct selinux_state *state,
390 struct netlbl_lsm_secattr *secattr,
391 u32 *sid);
392
393 int security_netlbl_sid_to_secattr(struct selinux_state *state,
394 u32 sid,
395 struct netlbl_lsm_secattr *secattr);
396 #else
security_netlbl_secattr_to_sid(struct selinux_state * state,struct netlbl_lsm_secattr * secattr,u32 * sid)397 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
398 struct netlbl_lsm_secattr *secattr,
399 u32 *sid)
400 {
401 return -EIDRM;
402 }
403
security_netlbl_sid_to_secattr(struct selinux_state * state,u32 sid,struct netlbl_lsm_secattr * secattr)404 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
405 u32 sid,
406 struct netlbl_lsm_secattr *secattr)
407 {
408 return -ENOENT;
409 }
410 #endif /* CONFIG_NETLABEL */
411
412 const char *security_get_initial_sid_context(u32 sid);
413
414 /*
415 * status notifier using mmap interface
416 */
417 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
418
419 #define SELINUX_KERNEL_STATUS_VERSION 1
420 struct selinux_kernel_status {
421 u32 version; /* version number of thie structure */
422 u32 sequence; /* sequence number of seqlock logic */
423 u32 enforcing; /* current setting of enforcing mode */
424 u32 policyload; /* times of policy reloaded */
425 u32 deny_unknown; /* current setting of deny_unknown */
426 /*
427 * The version > 0 supports above members.
428 */
429 } __packed;
430
431 extern void selinux_status_update_setenforce(struct selinux_state *state,
432 int enforcing);
433 extern void selinux_status_update_policyload(struct selinux_state *state,
434 int seqno);
435 extern void selinux_complete_init(void);
436 extern int selinux_disable(struct selinux_state *state);
437 extern void exit_sel_fs(void);
438 extern struct path selinux_null;
439 extern struct vfsmount *selinuxfs_mount;
440 extern void selnl_notify_setenforce(int val);
441 extern void selnl_notify_policyload(u32 seqno);
442 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
443
444 extern void avtab_cache_init(void);
445 extern void ebitmap_cache_init(void);
446 extern void hashtab_cache_init(void);
447 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
448
449 #endif /* _SELINUX_SECURITY_H_ */
450
