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