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