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
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 if (value)
156 pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-checkreqprot\n");
157 WRITE_ONCE(state->checkreqprot, value);
158 }
159
160 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
selinux_disabled(struct selinux_state * state)161 static inline bool selinux_disabled(struct selinux_state *state)
162 {
163 return READ_ONCE(state->disabled);
164 }
165
selinux_mark_disabled(struct selinux_state * state)166 static inline void selinux_mark_disabled(struct selinux_state *state)
167 {
168 WRITE_ONCE(state->disabled, true);
169 }
170 #else
selinux_disabled(struct selinux_state * state)171 static inline bool selinux_disabled(struct selinux_state *state)
172 {
173 return false;
174 }
175 #endif
176
selinux_policycap_netpeer(void)177 static inline bool selinux_policycap_netpeer(void)
178 {
179 struct selinux_state *state = &selinux_state;
180
181 return READ_ONCE(state->policycap[POLICYDB_CAP_NETPEER]);
182 }
183
selinux_policycap_openperm(void)184 static inline bool selinux_policycap_openperm(void)
185 {
186 struct selinux_state *state = &selinux_state;
187
188 return READ_ONCE(state->policycap[POLICYDB_CAP_OPENPERM]);
189 }
190
selinux_policycap_extsockclass(void)191 static inline bool selinux_policycap_extsockclass(void)
192 {
193 struct selinux_state *state = &selinux_state;
194
195 return READ_ONCE(state->policycap[POLICYDB_CAP_EXTSOCKCLASS]);
196 }
197
selinux_policycap_alwaysnetwork(void)198 static inline bool selinux_policycap_alwaysnetwork(void)
199 {
200 struct selinux_state *state = &selinux_state;
201
202 return READ_ONCE(state->policycap[POLICYDB_CAP_ALWAYSNETWORK]);
203 }
204
selinux_policycap_cgroupseclabel(void)205 static inline bool selinux_policycap_cgroupseclabel(void)
206 {
207 struct selinux_state *state = &selinux_state;
208
209 return READ_ONCE(state->policycap[POLICYDB_CAP_CGROUPSECLABEL]);
210 }
211
selinux_policycap_nnp_nosuid_transition(void)212 static inline bool selinux_policycap_nnp_nosuid_transition(void)
213 {
214 struct selinux_state *state = &selinux_state;
215
216 return READ_ONCE(state->policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
217 }
218
selinux_policycap_genfs_seclabel_symlinks(void)219 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
220 {
221 struct selinux_state *state = &selinux_state;
222
223 return READ_ONCE(state->policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
224 }
225
selinux_policycap_ioctl_skip_cloexec(void)226 static inline bool selinux_policycap_ioctl_skip_cloexec(void)
227 {
228 struct selinux_state *state = &selinux_state;
229
230 return READ_ONCE(state->policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
231 }
232
233 struct selinux_policy_convert_data;
234
235 struct selinux_load_state {
236 struct selinux_policy *policy;
237 struct selinux_policy_convert_data *convert_data;
238 };
239
240 int security_mls_enabled(struct selinux_state *state);
241 int security_load_policy(struct selinux_state *state,
242 void *data, size_t len,
243 struct selinux_load_state *load_state);
244 void selinux_policy_commit(struct selinux_state *state,
245 struct selinux_load_state *load_state);
246 void selinux_policy_cancel(struct selinux_state *state,
247 struct selinux_load_state *load_state);
248 int security_read_policy(struct selinux_state *state,
249 void **data, size_t *len);
250 int security_read_state_kernel(struct selinux_state *state,
251 void **data, size_t *len);
252 int security_policycap_supported(struct selinux_state *state,
253 unsigned int req_cap);
254
255 #define SEL_VEC_MAX 32
256 struct av_decision {
257 u32 allowed;
258 u32 auditallow;
259 u32 auditdeny;
260 u32 seqno;
261 u32 flags;
262 };
263
264 #define XPERMS_ALLOWED 1
265 #define XPERMS_AUDITALLOW 2
266 #define XPERMS_DONTAUDIT 4
267
268 #define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x) & 0x1f))
269 #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x) & 0x1f)))
270 struct extended_perms_data {
271 u32 p[8];
272 };
273
274 struct extended_perms_decision {
275 u8 used;
276 u8 driver;
277 struct extended_perms_data *allowed;
278 struct extended_perms_data *auditallow;
279 struct extended_perms_data *dontaudit;
280 };
281
282 struct extended_perms {
283 u16 len; /* length associated decision chain */
284 struct extended_perms_data drivers; /* flag drivers that are used */
285 };
286
287 /* definitions of av_decision.flags */
288 #define AVD_FLAGS_PERMISSIVE 0x0001
289
290 void security_compute_av(struct selinux_state *state,
291 u32 ssid, u32 tsid,
292 u16 tclass, struct av_decision *avd,
293 struct extended_perms *xperms);
294
295 void security_compute_xperms_decision(struct selinux_state *state,
296 u32 ssid, u32 tsid, u16 tclass,
297 u8 driver,
298 struct extended_perms_decision *xpermd);
299
300 void security_compute_av_user(struct selinux_state *state,
301 u32 ssid, u32 tsid,
302 u16 tclass, struct av_decision *avd);
303
304 int security_transition_sid(struct selinux_state *state,
305 u32 ssid, u32 tsid, u16 tclass,
306 const struct qstr *qstr, u32 *out_sid);
307
308 int security_transition_sid_user(struct selinux_state *state,
309 u32 ssid, u32 tsid, u16 tclass,
310 const char *objname, u32 *out_sid);
311
312 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
313 u16 tclass, u32 *out_sid);
314
315 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
316 u16 tclass, u32 *out_sid);
317
318 int security_sid_to_context(struct selinux_state *state, u32 sid,
319 char **scontext, u32 *scontext_len);
320
321 int security_sid_to_context_force(struct selinux_state *state,
322 u32 sid, char **scontext, u32 *scontext_len);
323
324 int security_sid_to_context_inval(struct selinux_state *state,
325 u32 sid, char **scontext, u32 *scontext_len);
326
327 int security_context_to_sid(struct selinux_state *state,
328 const char *scontext, u32 scontext_len,
329 u32 *out_sid, gfp_t gfp);
330
331 int security_context_str_to_sid(struct selinux_state *state,
332 const char *scontext, u32 *out_sid, gfp_t gfp);
333
334 int security_context_to_sid_default(struct selinux_state *state,
335 const char *scontext, u32 scontext_len,
336 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
337
338 int security_context_to_sid_force(struct selinux_state *state,
339 const char *scontext, u32 scontext_len,
340 u32 *sid);
341
342 int security_get_user_sids(struct selinux_state *state,
343 u32 callsid, char *username,
344 u32 **sids, u32 *nel);
345
346 int security_port_sid(struct selinux_state *state,
347 u8 protocol, u16 port, u32 *out_sid);
348
349 int security_ib_pkey_sid(struct selinux_state *state,
350 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
351
352 int security_ib_endport_sid(struct selinux_state *state,
353 const char *dev_name, u8 port_num, u32 *out_sid);
354
355 int security_netif_sid(struct selinux_state *state,
356 char *name, u32 *if_sid);
357
358 int security_node_sid(struct selinux_state *state,
359 u16 domain, void *addr, u32 addrlen,
360 u32 *out_sid);
361
362 int security_validate_transition(struct selinux_state *state,
363 u32 oldsid, u32 newsid, u32 tasksid,
364 u16 tclass);
365
366 int security_validate_transition_user(struct selinux_state *state,
367 u32 oldsid, u32 newsid, u32 tasksid,
368 u16 tclass);
369
370 int security_bounded_transition(struct selinux_state *state,
371 u32 oldsid, u32 newsid);
372
373 int security_sid_mls_copy(struct selinux_state *state,
374 u32 sid, u32 mls_sid, u32 *new_sid);
375
376 int security_net_peersid_resolve(struct selinux_state *state,
377 u32 nlbl_sid, u32 nlbl_type,
378 u32 xfrm_sid,
379 u32 *peer_sid);
380
381 int security_get_classes(struct selinux_policy *policy,
382 char ***classes, int *nclasses);
383 int security_get_permissions(struct selinux_policy *policy,
384 char *class, char ***perms, int *nperms);
385 int security_get_reject_unknown(struct selinux_state *state);
386 int security_get_allow_unknown(struct selinux_state *state);
387
388 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
389 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
390 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
391 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
392 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
393 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
394 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
395 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
396
397 int security_fs_use(struct selinux_state *state, struct super_block *sb);
398
399 int security_genfs_sid(struct selinux_state *state,
400 const char *fstype, const char *path, u16 sclass,
401 u32 *sid);
402
403 int selinux_policy_genfs_sid(struct selinux_policy *policy,
404 const char *fstype, const char *path, u16 sclass,
405 u32 *sid);
406
407 #ifdef CONFIG_NETLABEL
408 int security_netlbl_secattr_to_sid(struct selinux_state *state,
409 struct netlbl_lsm_secattr *secattr,
410 u32 *sid);
411
412 int security_netlbl_sid_to_secattr(struct selinux_state *state,
413 u32 sid,
414 struct netlbl_lsm_secattr *secattr);
415 #else
security_netlbl_secattr_to_sid(struct selinux_state * state,struct netlbl_lsm_secattr * secattr,u32 * sid)416 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
417 struct netlbl_lsm_secattr *secattr,
418 u32 *sid)
419 {
420 return -EIDRM;
421 }
422
security_netlbl_sid_to_secattr(struct selinux_state * state,u32 sid,struct netlbl_lsm_secattr * secattr)423 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
424 u32 sid,
425 struct netlbl_lsm_secattr *secattr)
426 {
427 return -ENOENT;
428 }
429 #endif /* CONFIG_NETLABEL */
430
431 const char *security_get_initial_sid_context(u32 sid);
432
433 /*
434 * status notifier using mmap interface
435 */
436 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
437
438 #define SELINUX_KERNEL_STATUS_VERSION 1
439 struct selinux_kernel_status {
440 u32 version; /* version number of the structure */
441 u32 sequence; /* sequence number of seqlock logic */
442 u32 enforcing; /* current setting of enforcing mode */
443 u32 policyload; /* times of policy reloaded */
444 u32 deny_unknown; /* current setting of deny_unknown */
445 /*
446 * The version > 0 supports above members.
447 */
448 } __packed;
449
450 extern void selinux_status_update_setenforce(struct selinux_state *state,
451 int enforcing);
452 extern void selinux_status_update_policyload(struct selinux_state *state,
453 int seqno);
454 extern void selinux_complete_init(void);
455 extern int selinux_disable(struct selinux_state *state);
456 extern void exit_sel_fs(void);
457 extern struct path selinux_null;
458 extern void selnl_notify_setenforce(int val);
459 extern void selnl_notify_policyload(u32 seqno);
460 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
461
462 extern void avtab_cache_init(void);
463 extern void ebitmap_cache_init(void);
464 extern void hashtab_cache_init(void);
465 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
466
467 #endif /* _SELINUX_SECURITY_H_ */
468