1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Security server interface.
4 *
5 * Author : Stephen Smalley, <stephen.smalley.work@gmail.com>
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 #define SE_SBNATIVE 0x1000
69
70 #define CONTEXT_STR "context"
71 #define FSCONTEXT_STR "fscontext"
72 #define ROOTCONTEXT_STR "rootcontext"
73 #define DEFCONTEXT_STR "defcontext"
74 #define SECLABEL_STR "seclabel"
75
76 struct netlbl_lsm_secattr;
77
78 extern int selinux_enabled_boot;
79
80 /*
81 * type_datum properties
82 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
83 */
84 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
85 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
86
87 /* limitation of boundary depth */
88 #define POLICYDB_BOUNDS_MAXDEPTH 4
89
90 struct selinux_policy;
91
92 struct selinux_state {
93 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
94 bool enforcing;
95 #endif
96 bool initialized;
97 bool policycap[__POLICYDB_CAP_MAX];
98 bool android_netlink_route;
99 bool android_netlink_getneigh;
100
101 struct page *status_page;
102 struct mutex status_lock;
103
104 struct selinux_policy __rcu *policy;
105 struct mutex policy_mutex;
106 } __randomize_layout;
107
108 void selinux_avc_init(void);
109
110 extern struct selinux_state selinux_state;
111
selinux_initialized(void)112 static inline bool selinux_initialized(void)
113 {
114 /* do a synchronized load to avoid race conditions */
115 return smp_load_acquire(&selinux_state.initialized);
116 }
117
selinux_mark_initialized(void)118 static inline void selinux_mark_initialized(void)
119 {
120 /* do a synchronized write to avoid race conditions */
121 smp_store_release(&selinux_state.initialized, true);
122 }
123
124 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
enforcing_enabled(void)125 static inline bool enforcing_enabled(void)
126 {
127 return READ_ONCE(selinux_state.enforcing);
128 }
129
enforcing_set(bool value)130 static inline void enforcing_set(bool value)
131 {
132 WRITE_ONCE(selinux_state.enforcing, value);
133 }
134 #else
enforcing_enabled(void)135 static inline bool enforcing_enabled(void)
136 {
137 return true;
138 }
139
enforcing_set(bool value)140 static inline void enforcing_set(bool value)
141 {
142 }
143 #endif
144
checkreqprot_get(void)145 static inline bool checkreqprot_get(void)
146 {
147 /* non-zero/true checkreqprot values are no longer supported */
148 return 0;
149 }
150
selinux_policycap_netpeer(void)151 static inline bool selinux_policycap_netpeer(void)
152 {
153 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_NETPEER]);
154 }
155
selinux_policycap_openperm(void)156 static inline bool selinux_policycap_openperm(void)
157 {
158 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_OPENPERM]);
159 }
160
selinux_policycap_extsockclass(void)161 static inline bool selinux_policycap_extsockclass(void)
162 {
163 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_EXTSOCKCLASS]);
164 }
165
selinux_policycap_alwaysnetwork(void)166 static inline bool selinux_policycap_alwaysnetwork(void)
167 {
168 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_ALWAYSNETWORK]);
169 }
170
selinux_policycap_cgroupseclabel(void)171 static inline bool selinux_policycap_cgroupseclabel(void)
172 {
173 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_CGROUPSECLABEL]);
174 }
175
selinux_policycap_nnp_nosuid_transition(void)176 static inline bool selinux_policycap_nnp_nosuid_transition(void)
177 {
178 return READ_ONCE(
179 selinux_state.policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
180 }
181
selinux_policycap_genfs_seclabel_symlinks(void)182 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
183 {
184 return READ_ONCE(
185 selinux_state.policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
186 }
187
selinux_policycap_ioctl_skip_cloexec(void)188 static inline bool selinux_policycap_ioctl_skip_cloexec(void)
189 {
190 return READ_ONCE(
191 selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
192 }
193
selinux_android_nlroute_getlink(void)194 static inline bool selinux_android_nlroute_getlink(void)
195 {
196 struct selinux_state *state = &selinux_state;
197
198 return state->android_netlink_route;
199 }
200
selinux_android_nlroute_getneigh(void)201 static inline bool selinux_android_nlroute_getneigh(void)
202 {
203 struct selinux_state *state = &selinux_state;
204
205 return state->android_netlink_getneigh;
206 }
207
208 struct selinux_policy_convert_data;
209
210 struct selinux_load_state {
211 struct selinux_policy *policy;
212 struct selinux_policy_convert_data *convert_data;
213 };
214
215 int security_mls_enabled(void);
216 int security_load_policy(void *data, size_t len,
217 struct selinux_load_state *load_state);
218 void selinux_policy_commit(struct selinux_load_state *load_state);
219 void selinux_policy_cancel(struct selinux_load_state *load_state);
220 int security_read_policy(void **data, size_t *len);
221 int security_read_state_kernel(void **data, size_t *len);
222 int security_policycap_supported(unsigned int req_cap);
223
224 #define SEL_VEC_MAX 32
225 struct av_decision {
226 u32 allowed;
227 u32 auditallow;
228 u32 auditdeny;
229 u32 seqno;
230 u32 flags;
231 };
232
233 #define XPERMS_ALLOWED 1
234 #define XPERMS_AUDITALLOW 2
235 #define XPERMS_DONTAUDIT 4
236
237 #define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x) & 0x1f))
238 #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x) & 0x1f)))
239 struct extended_perms_data {
240 u32 p[8];
241 };
242
243 struct extended_perms_decision {
244 u8 used;
245 u8 driver;
246 struct extended_perms_data *allowed;
247 struct extended_perms_data *auditallow;
248 struct extended_perms_data *dontaudit;
249 };
250
251 struct extended_perms {
252 u16 len; /* length associated decision chain */
253 struct extended_perms_data drivers; /* flag drivers that are used */
254 };
255
256 /* definitions of av_decision.flags */
257 #define AVD_FLAGS_PERMISSIVE 0x0001
258
259 void security_compute_av(u32 ssid, u32 tsid,
260 u16 tclass, struct av_decision *avd,
261 struct extended_perms *xperms);
262
263 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass,
264 u8 driver,
265 struct extended_perms_decision *xpermd);
266
267 void security_compute_av_user(u32 ssid, u32 tsid,
268 u16 tclass, struct av_decision *avd);
269
270 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
271 const struct qstr *qstr, u32 *out_sid);
272
273 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
274 const char *objname, u32 *out_sid);
275
276 int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
277
278 int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
279
280 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len);
281
282 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
283
284 int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len);
285
286 int security_context_to_sid(const char *scontext, u32 scontext_len,
287 u32 *out_sid, gfp_t gfp);
288
289 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
290
291 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
292 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
293
294 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
295 u32 *sid);
296
297 int security_get_user_sids(u32 callsid, char *username, u32 **sids, u32 *nel);
298
299 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
300
301 int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
302
303 int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
304
305 int security_netif_sid(char *name, u32 *if_sid);
306
307 int security_node_sid(u16 domain, void *addr, u32 addrlen,
308 u32 *out_sid);
309
310 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
311 u16 tclass);
312
313 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
314 u16 tclass);
315
316 int security_bounded_transition(u32 oldsid, u32 newsid);
317
318 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
319
320 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
321 u32 xfrm_sid,
322 u32 *peer_sid);
323
324 int security_get_classes(struct selinux_policy *policy,
325 char ***classes, u32 *nclasses);
326 int security_get_permissions(struct selinux_policy *policy,
327 const char *class, char ***perms, u32 *nperms);
328 int security_get_reject_unknown(void);
329 int security_get_allow_unknown(void);
330
331 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
332 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
333 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
334 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
335 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
336 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
337 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
338 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
339
340 int security_fs_use(struct super_block *sb);
341
342 int security_genfs_sid(const char *fstype, const char *path, u16 sclass,
343 u32 *sid);
344
345 int selinux_policy_genfs_sid(struct selinux_policy *policy,
346 const char *fstype, const char *path, u16 sclass,
347 u32 *sid);
348
349 #ifdef CONFIG_NETLABEL
350 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
351 u32 *sid);
352
353 int security_netlbl_sid_to_secattr(u32 sid,
354 struct netlbl_lsm_secattr *secattr);
355 #else
security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr * secattr,u32 * sid)356 static inline int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
357 u32 *sid)
358 {
359 return -EIDRM;
360 }
361
security_netlbl_sid_to_secattr(u32 sid,struct netlbl_lsm_secattr * secattr)362 static inline int security_netlbl_sid_to_secattr(u32 sid,
363 struct netlbl_lsm_secattr *secattr)
364 {
365 return -ENOENT;
366 }
367 #endif /* CONFIG_NETLABEL */
368
369 const char *security_get_initial_sid_context(u32 sid);
370
371 /*
372 * status notifier using mmap interface
373 */
374 extern struct page *selinux_kernel_status_page(void);
375
376 #define SELINUX_KERNEL_STATUS_VERSION 1
377 struct selinux_kernel_status {
378 u32 version; /* version number of the structure */
379 u32 sequence; /* sequence number of seqlock logic */
380 u32 enforcing; /* current setting of enforcing mode */
381 u32 policyload; /* times of policy reloaded */
382 u32 deny_unknown; /* current setting of deny_unknown */
383 /*
384 * The version > 0 supports above members.
385 */
386 } __packed;
387
388 extern void selinux_status_update_setenforce(bool enforcing);
389 extern void selinux_status_update_policyload(u32 seqno);
390 extern void selinux_complete_init(void);
391 extern struct path selinux_null;
392 extern void selnl_notify_setenforce(int val);
393 extern void selnl_notify_policyload(u32 seqno);
394 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
395
396 extern void avtab_cache_init(void);
397 extern void ebitmap_cache_init(void);
398 extern void hashtab_cache_init(void);
399 extern int security_sidtab_hash_stats(char *page);
400 extern void selinux_nlmsg_init(void);
401
402 #endif /* _SELINUX_SECURITY_H_ */
403