xref: /linux/security/selinux/include/security.h (revision a4eb44a6435d6d8f9e642407a4a06f65eb90ca04)
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 
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 
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
126 static inline bool enforcing_enabled(struct selinux_state *state)
127 {
128 	return READ_ONCE(state->enforcing);
129 }
130 
131 static inline void enforcing_set(struct selinux_state *state, bool value)
132 {
133 	WRITE_ONCE(state->enforcing, value);
134 }
135 #else
136 static inline bool enforcing_enabled(struct selinux_state *state)
137 {
138 	return true;
139 }
140 
141 static inline void enforcing_set(struct selinux_state *state, bool value)
142 {
143 }
144 #endif
145 
146 static inline bool checkreqprot_get(const struct selinux_state *state)
147 {
148 	return READ_ONCE(state->checkreqprot);
149 }
150 
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
157 static inline bool selinux_disabled(struct selinux_state *state)
158 {
159 	return READ_ONCE(state->disabled);
160 }
161 
162 static inline void selinux_mark_disabled(struct selinux_state *state)
163 {
164 	WRITE_ONCE(state->disabled, true);
165 }
166 #else
167 static inline bool selinux_disabled(struct selinux_state *state)
168 {
169 	return false;
170 }
171 #endif
172 
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 
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 
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 
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 
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 
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 
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 struct selinux_policy_convert_data;
223 
224 struct selinux_load_state {
225 	struct selinux_policy *policy;
226 	struct selinux_policy_convert_data *convert_data;
227 };
228 
229 int security_mls_enabled(struct selinux_state *state);
230 int security_load_policy(struct selinux_state *state,
231 			 void *data, size_t len,
232 			 struct selinux_load_state *load_state);
233 void selinux_policy_commit(struct selinux_state *state,
234 			   struct selinux_load_state *load_state);
235 void selinux_policy_cancel(struct selinux_state *state,
236 			   struct selinux_load_state *load_state);
237 int security_read_policy(struct selinux_state *state,
238 			 void **data, size_t *len);
239 int security_read_state_kernel(struct selinux_state *state,
240 			       void **data, size_t *len);
241 int security_policycap_supported(struct selinux_state *state,
242 				 unsigned int req_cap);
243 
244 #define SEL_VEC_MAX 32
245 struct av_decision {
246 	u32 allowed;
247 	u32 auditallow;
248 	u32 auditdeny;
249 	u32 seqno;
250 	u32 flags;
251 };
252 
253 #define XPERMS_ALLOWED 1
254 #define XPERMS_AUDITALLOW 2
255 #define XPERMS_DONTAUDIT 4
256 
257 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
258 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
259 struct extended_perms_data {
260 	u32 p[8];
261 };
262 
263 struct extended_perms_decision {
264 	u8 used;
265 	u8 driver;
266 	struct extended_perms_data *allowed;
267 	struct extended_perms_data *auditallow;
268 	struct extended_perms_data *dontaudit;
269 };
270 
271 struct extended_perms {
272 	u16 len;	/* length associated decision chain */
273 	struct extended_perms_data drivers; /* flag drivers that are used */
274 };
275 
276 /* definitions of av_decision.flags */
277 #define AVD_FLAGS_PERMISSIVE	0x0001
278 
279 void security_compute_av(struct selinux_state *state,
280 			 u32 ssid, u32 tsid,
281 			 u16 tclass, struct av_decision *avd,
282 			 struct extended_perms *xperms);
283 
284 void security_compute_xperms_decision(struct selinux_state *state,
285 				      u32 ssid, u32 tsid, u16 tclass,
286 				      u8 driver,
287 				      struct extended_perms_decision *xpermd);
288 
289 void security_compute_av_user(struct selinux_state *state,
290 			      u32 ssid, u32 tsid,
291 			      u16 tclass, struct av_decision *avd);
292 
293 int security_transition_sid(struct selinux_state *state,
294 			    u32 ssid, u32 tsid, u16 tclass,
295 			    const struct qstr *qstr, u32 *out_sid);
296 
297 int security_transition_sid_user(struct selinux_state *state,
298 				 u32 ssid, u32 tsid, u16 tclass,
299 				 const char *objname, u32 *out_sid);
300 
301 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
302 			u16 tclass, u32 *out_sid);
303 
304 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
305 			u16 tclass, u32 *out_sid);
306 
307 int security_sid_to_context(struct selinux_state *state, u32 sid,
308 			    char **scontext, u32 *scontext_len);
309 
310 int security_sid_to_context_force(struct selinux_state *state,
311 				  u32 sid, char **scontext, u32 *scontext_len);
312 
313 int security_sid_to_context_inval(struct selinux_state *state,
314 				  u32 sid, char **scontext, u32 *scontext_len);
315 
316 int security_context_to_sid(struct selinux_state *state,
317 			    const char *scontext, u32 scontext_len,
318 			    u32 *out_sid, gfp_t gfp);
319 
320 int security_context_str_to_sid(struct selinux_state *state,
321 				const char *scontext, u32 *out_sid, gfp_t gfp);
322 
323 int security_context_to_sid_default(struct selinux_state *state,
324 				    const char *scontext, u32 scontext_len,
325 				    u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
326 
327 int security_context_to_sid_force(struct selinux_state *state,
328 				  const char *scontext, u32 scontext_len,
329 				  u32 *sid);
330 
331 int security_get_user_sids(struct selinux_state *state,
332 			   u32 callsid, char *username,
333 			   u32 **sids, u32 *nel);
334 
335 int security_port_sid(struct selinux_state *state,
336 		      u8 protocol, u16 port, u32 *out_sid);
337 
338 int security_ib_pkey_sid(struct selinux_state *state,
339 			 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
340 
341 int security_ib_endport_sid(struct selinux_state *state,
342 			    const char *dev_name, u8 port_num, u32 *out_sid);
343 
344 int security_netif_sid(struct selinux_state *state,
345 		       char *name, u32 *if_sid);
346 
347 int security_node_sid(struct selinux_state *state,
348 		      u16 domain, void *addr, u32 addrlen,
349 		      u32 *out_sid);
350 
351 int security_validate_transition(struct selinux_state *state,
352 				 u32 oldsid, u32 newsid, u32 tasksid,
353 				 u16 tclass);
354 
355 int security_validate_transition_user(struct selinux_state *state,
356 				      u32 oldsid, u32 newsid, u32 tasksid,
357 				      u16 tclass);
358 
359 int security_bounded_transition(struct selinux_state *state,
360 				u32 oldsid, u32 newsid);
361 
362 int security_sid_mls_copy(struct selinux_state *state,
363 			  u32 sid, u32 mls_sid, u32 *new_sid);
364 
365 int security_net_peersid_resolve(struct selinux_state *state,
366 				 u32 nlbl_sid, u32 nlbl_type,
367 				 u32 xfrm_sid,
368 				 u32 *peer_sid);
369 
370 int security_get_classes(struct selinux_policy *policy,
371 			 char ***classes, int *nclasses);
372 int security_get_permissions(struct selinux_policy *policy,
373 			     char *class, char ***perms, int *nperms);
374 int security_get_reject_unknown(struct selinux_state *state);
375 int security_get_allow_unknown(struct selinux_state *state);
376 
377 #define SECURITY_FS_USE_XATTR		1 /* use xattr */
378 #define SECURITY_FS_USE_TRANS		2 /* use transition SIDs, e.g. devpts/tmpfs */
379 #define SECURITY_FS_USE_TASK		3 /* use task SIDs, e.g. pipefs/sockfs */
380 #define SECURITY_FS_USE_GENFS		4 /* use the genfs support */
381 #define SECURITY_FS_USE_NONE		5 /* no labeling support */
382 #define SECURITY_FS_USE_MNTPOINT	6 /* use mountpoint labeling */
383 #define SECURITY_FS_USE_NATIVE		7 /* use native label support */
384 #define SECURITY_FS_USE_MAX		7 /* Highest SECURITY_FS_USE_XXX */
385 
386 int security_fs_use(struct selinux_state *state, struct super_block *sb);
387 
388 int security_genfs_sid(struct selinux_state *state,
389 		       const char *fstype, char *name, u16 sclass,
390 		       u32 *sid);
391 
392 int selinux_policy_genfs_sid(struct selinux_policy *policy,
393 		       const char *fstype, char *name, u16 sclass,
394 		       u32 *sid);
395 
396 #ifdef CONFIG_NETLABEL
397 int security_netlbl_secattr_to_sid(struct selinux_state *state,
398 				   struct netlbl_lsm_secattr *secattr,
399 				   u32 *sid);
400 
401 int security_netlbl_sid_to_secattr(struct selinux_state *state,
402 				   u32 sid,
403 				   struct netlbl_lsm_secattr *secattr);
404 #else
405 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
406 					    struct netlbl_lsm_secattr *secattr,
407 					    u32 *sid)
408 {
409 	return -EIDRM;
410 }
411 
412 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
413 					 u32 sid,
414 					 struct netlbl_lsm_secattr *secattr)
415 {
416 	return -ENOENT;
417 }
418 #endif /* CONFIG_NETLABEL */
419 
420 const char *security_get_initial_sid_context(u32 sid);
421 
422 /*
423  * status notifier using mmap interface
424  */
425 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
426 
427 #define SELINUX_KERNEL_STATUS_VERSION	1
428 struct selinux_kernel_status {
429 	u32	version;	/* version number of the structure */
430 	u32	sequence;	/* sequence number of seqlock logic */
431 	u32	enforcing;	/* current setting of enforcing mode */
432 	u32	policyload;	/* times of policy reloaded */
433 	u32	deny_unknown;	/* current setting of deny_unknown */
434 	/*
435 	 * The version > 0 supports above members.
436 	 */
437 } __packed;
438 
439 extern void selinux_status_update_setenforce(struct selinux_state *state,
440 					     int enforcing);
441 extern void selinux_status_update_policyload(struct selinux_state *state,
442 					     int seqno);
443 extern void selinux_complete_init(void);
444 extern int selinux_disable(struct selinux_state *state);
445 extern void exit_sel_fs(void);
446 extern struct path selinux_null;
447 extern void selnl_notify_setenforce(int val);
448 extern void selnl_notify_policyload(u32 seqno);
449 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
450 
451 extern void avtab_cache_init(void);
452 extern void ebitmap_cache_init(void);
453 extern void hashtab_cache_init(void);
454 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
455 
456 #endif /* _SELINUX_SECURITY_H_ */
457