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