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 #define POLICYDB_VERSION_COND_XPERMS 34 /* extended permissions in conditional policies */
50 #define POLICYDB_VERSION_NEVERAUDIT 35 /* neveraudit types */
51
52 /* Range of policy versions we understand*/
53 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
54 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_NEVERAUDIT
55
56 /* Mask for just the mount related flags */
57 #define SE_MNTMASK 0x0f
58 /* Super block security struct flags for mount options */
59 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
60 #define CONTEXT_MNT 0x01
61 #define FSCONTEXT_MNT 0x02
62 #define ROOTCONTEXT_MNT 0x04
63 #define DEFCONTEXT_MNT 0x08
64 #define SBLABEL_MNT 0x10
65 /* Non-mount related flags */
66 #define SE_SBINITIALIZED 0x0100
67 #define SE_SBPROC 0x0200
68 #define SE_SBGENFS 0x0400
69 #define SE_SBGENFS_XATTR 0x0800
70 #define SE_SBNATIVE 0x1000
71
72 #define CONTEXT_STR "context"
73 #define FSCONTEXT_STR "fscontext"
74 #define ROOTCONTEXT_STR "rootcontext"
75 #define DEFCONTEXT_STR "defcontext"
76 #define SECLABEL_STR "seclabel"
77
78 struct netlbl_lsm_secattr;
79
80 extern int selinux_enabled_boot;
81
82 /*
83 * type_datum properties
84 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
85 */
86 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
87 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
88
89 /* limitation of boundary depth */
90 #define POLICYDB_BOUNDS_MAXDEPTH 4
91
92 struct selinux_policy;
93
94 struct selinux_state {
95 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
96 bool enforcing;
97 #endif
98 bool initialized;
99 bool policycap[__POLICYDB_CAP_MAX];
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_policycap_userspace_initial_context(void)194 static inline bool selinux_policycap_userspace_initial_context(void)
195 {
196 return READ_ONCE(
197 selinux_state.policycap[POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT]);
198 }
199
selinux_policycap_netlink_xperm(void)200 static inline bool selinux_policycap_netlink_xperm(void)
201 {
202 return READ_ONCE(
203 selinux_state.policycap[POLICYDB_CAP_NETLINK_XPERM]);
204 }
205
selinux_policycap_functionfs_seclabel(void)206 static inline bool selinux_policycap_functionfs_seclabel(void)
207 {
208 return READ_ONCE(
209 selinux_state.policycap[POLICYDB_CAP_FUNCTIONFS_SECLABEL]);
210 }
211
212 struct selinux_policy_convert_data;
213
214 struct selinux_load_state {
215 struct selinux_policy *policy;
216 struct selinux_policy_convert_data *convert_data;
217 };
218
219 int security_mls_enabled(void);
220 int security_load_policy(void *data, size_t len,
221 struct selinux_load_state *load_state);
222 void selinux_policy_commit(struct selinux_load_state *load_state);
223 void selinux_policy_cancel(struct selinux_load_state *load_state);
224 int security_read_policy(void **data, size_t *len);
225 int security_read_state_kernel(void **data, size_t *len);
226 int security_policycap_supported(unsigned int req_cap);
227
228 #define SEL_VEC_MAX 32
229 struct av_decision {
230 u32 allowed;
231 u32 auditallow;
232 u32 auditdeny;
233 u32 seqno;
234 u32 flags;
235 };
236
237 #define XPERMS_ALLOWED 1
238 #define XPERMS_AUDITALLOW 2
239 #define XPERMS_DONTAUDIT 4
240
241 #define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x)&0x1f))
242 #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x)&0x1f)))
243 struct extended_perms_data {
244 u32 p[8];
245 };
246
247 struct extended_perms_decision {
248 u8 used;
249 u8 driver;
250 u8 base_perm;
251 struct extended_perms_data *allowed;
252 struct extended_perms_data *auditallow;
253 struct extended_perms_data *dontaudit;
254 };
255
256 struct extended_perms {
257 u16 len; /* length associated decision chain */
258 u8 base_perms; /* which base permissions are covered */
259 struct extended_perms_data drivers; /* flag drivers that are used */
260 };
261
262 /* definitions of av_decision.flags */
263 #define AVD_FLAGS_PERMISSIVE 0x0001
264 #define AVD_FLAGS_NEVERAUDIT 0x0002
265
266 void security_compute_av(u32 ssid, u32 tsid, u16 tclass,
267 struct av_decision *avd,
268 struct extended_perms *xperms);
269
270 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, u8 driver,
271 u8 base_perm,
272 struct extended_perms_decision *xpermd);
273
274 void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass,
275 struct av_decision *avd);
276
277 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
278 const struct qstr *qstr, u32 *out_sid);
279
280 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
281 const char *objname, u32 *out_sid);
282
283 int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
284
285 int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
286
287 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len);
288
289 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
290
291 int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len);
292
293 int security_context_to_sid(const char *scontext, u32 scontext_len,
294 u32 *out_sid, gfp_t gfp);
295
296 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
297
298 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
299 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
300
301 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
302 u32 *sid);
303
304 int security_get_user_sids(u32 fromsid, const char *username, u32 **sids, u32 *nel);
305
306 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
307
308 int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
309
310 int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
311
312 int security_netif_sid(const char *name, u32 *if_sid);
313
314 int security_node_sid(u16 domain, const void *addr, u32 addrlen, u32 *out_sid);
315
316 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
317 u16 tclass);
318
319 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
320 u16 tclass);
321
322 int security_bounded_transition(u32 old_sid, u32 new_sid);
323
324 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
325
326 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid,
327 u32 *peer_sid);
328
329 int security_get_classes(struct selinux_policy *policy, char ***classes,
330 u32 *nclasses);
331 int security_get_permissions(struct selinux_policy *policy, const char *class,
332 char ***perms, u32 *nperms);
333 int security_get_reject_unknown(void);
334 int security_get_allow_unknown(void);
335
336 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
337 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
338 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
339 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
340 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
341 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
342 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
343 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
344
345 int security_fs_use(struct super_block *sb);
346
347 int security_genfs_sid(const char *fstype, const char *path, u16 sclass,
348 u32 *sid);
349
350 int selinux_policy_genfs_sid(struct selinux_policy *policy, const char *fstype,
351 const char *path, u16 sclass, u32 *sid);
352
353 #ifdef CONFIG_NETLABEL
354 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
355 u32 *sid);
356
357 int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr);
358 #else
359 static inline int
security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr * secattr,u32 * sid)360 security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid)
361 {
362 return -EIDRM;
363 }
364
365 static inline int
security_netlbl_sid_to_secattr(u32 sid,struct netlbl_lsm_secattr * secattr)366 security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
367 {
368 return -ENOENT;
369 }
370 #endif /* CONFIG_NETLABEL */
371
372 const char *security_get_initial_sid_context(u32 sid);
373
374 /*
375 * status notifier using mmap interface
376 */
377 extern struct page *selinux_kernel_status_page(void);
378
379 #define SELINUX_KERNEL_STATUS_VERSION 1
380 struct selinux_kernel_status {
381 u32 version; /* version number of the structure */
382 u32 sequence; /* sequence number of seqlock logic */
383 u32 enforcing; /* current setting of enforcing mode */
384 u32 policyload; /* times of policy reloaded */
385 u32 deny_unknown; /* current setting of deny_unknown */
386 /*
387 * The version > 0 supports above members.
388 */
389 } __packed;
390
391 extern void selinux_status_update_setenforce(bool enforcing);
392 extern void selinux_status_update_policyload(u32 seqno);
393 extern void selinux_complete_init(void);
394 extern struct path selinux_null;
395 extern void selnl_notify_setenforce(int val);
396 extern void selnl_notify_policyload(u32 seqno);
397 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
398
399 extern void avtab_cache_init(void);
400 extern void ebitmap_cache_init(void);
401 extern void hashtab_cache_init(void);
402 extern int security_sidtab_hash_stats(char *page);
403
404 #endif /* _SELINUX_SECURITY_H_ */
405