tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
51/* Range of policy versions we understand*/
52#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
53#define POLICYDB_VERSION_MAX POLICYDB_VERSION_COND_XPERMS
54
55/* Mask for just the mount related flags */
56#define SE_MNTMASK 0x0f
57/* Super block security struct flags for mount options */
58/* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
59#define CONTEXT_MNT 0x01
60#define FSCONTEXT_MNT 0x02
61#define ROOTCONTEXT_MNT 0x04
62#define DEFCONTEXT_MNT 0x08
63#define SBLABEL_MNT 0x10
64/* Non-mount related flags */
65#define SE_SBINITIALIZED 0x0100
66#define SE_SBPROC 0x0200
67#define SE_SBGENFS 0x0400
68#define SE_SBGENFS_XATTR 0x0800
69#define SE_SBNATIVE 0x1000
70
71#define CONTEXT_STR "context"
72#define FSCONTEXT_STR "fscontext"
73#define ROOTCONTEXT_STR "rootcontext"
74#define DEFCONTEXT_STR "defcontext"
75#define SECLABEL_STR "seclabel"
76
77struct netlbl_lsm_secattr;
78
79extern int selinux_enabled_boot;
80
81/*
82 * type_datum properties
83 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
84 */
85#define TYPEDATUM_PROPERTY_PRIMARY 0x0001
86#define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
87
88/* limitation of boundary depth */
89#define POLICYDB_BOUNDS_MAXDEPTH 4
90
91struct selinux_policy;
92
93struct selinux_state {
94#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
95 bool enforcing;
96#endif
97 bool initialized;
98 bool policycap[__POLICYDB_CAP_MAX];
99
100 struct page *status_page;
101 struct mutex status_lock;
102
103 struct selinux_policy __rcu *policy;
104 struct mutex policy_mutex;
105} __randomize_layout;
106
107void selinux_avc_init(void);
108
109extern struct selinux_state selinux_state;
110
111static inline bool selinux_initialized(void)
112{
113 /* do a synchronized load to avoid race conditions */
114 return smp_load_acquire(&selinux_state.initialized);
115}
116
117static inline void selinux_mark_initialized(void)
118{
119 /* do a synchronized write to avoid race conditions */
120 smp_store_release(&selinux_state.initialized, true);
121}
122
123#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
124static inline bool enforcing_enabled(void)
125{
126 return READ_ONCE(selinux_state.enforcing);
127}
128
129static inline void enforcing_set(bool value)
130{
131 WRITE_ONCE(selinux_state.enforcing, value);
132}
133#else
134static inline bool enforcing_enabled(void)
135{
136 return true;
137}
138
139static inline void enforcing_set(bool value)
140{
141}
142#endif
143
144static inline bool checkreqprot_get(void)
145{
146 /* non-zero/true checkreqprot values are no longer supported */
147 return 0;
148}
149
150static inline bool selinux_policycap_netpeer(void)
151{
152 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_NETPEER]);
153}
154
155static inline bool selinux_policycap_openperm(void)
156{
157 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_OPENPERM]);
158}
159
160static inline bool selinux_policycap_extsockclass(void)
161{
162 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_EXTSOCKCLASS]);
163}
164
165static inline bool selinux_policycap_alwaysnetwork(void)
166{
167 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_ALWAYSNETWORK]);
168}
169
170static inline bool selinux_policycap_cgroupseclabel(void)
171{
172 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_CGROUPSECLABEL]);
173}
174
175static inline bool selinux_policycap_nnp_nosuid_transition(void)
176{
177 return READ_ONCE(
178 selinux_state.policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
179}
180
181static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
182{
183 return READ_ONCE(
184 selinux_state.policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
185}
186
187static inline bool selinux_policycap_ioctl_skip_cloexec(void)
188{
189 return READ_ONCE(
190 selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
191}
192
193static inline bool selinux_policycap_userspace_initial_context(void)
194{
195 return READ_ONCE(
196 selinux_state.policycap[POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT]);
197}
198
199static inline bool selinux_policycap_netlink_xperm(void)
200{
201 return READ_ONCE(
202 selinux_state.policycap[POLICYDB_CAP_NETLINK_XPERM]);
203}
204
205struct selinux_policy_convert_data;
206
207struct selinux_load_state {
208 struct selinux_policy *policy;
209 struct selinux_policy_convert_data *convert_data;
210};
211
212int security_mls_enabled(void);
213int security_load_policy(void *data, size_t len,
214 struct selinux_load_state *load_state);
215void selinux_policy_commit(struct selinux_load_state *load_state);
216void selinux_policy_cancel(struct selinux_load_state *load_state);
217int security_read_policy(void **data, size_t *len);
218int security_read_state_kernel(void **data, size_t *len);
219int security_policycap_supported(unsigned int req_cap);
220
221#define SEL_VEC_MAX 32
222struct av_decision {
223 u32 allowed;
224 u32 auditallow;
225 u32 auditdeny;
226 u32 seqno;
227 u32 flags;
228};
229
230#define XPERMS_ALLOWED 1
231#define XPERMS_AUDITALLOW 2
232#define XPERMS_DONTAUDIT 4
233
234#define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x)&0x1f))
235#define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x)&0x1f)))
236struct extended_perms_data {
237 u32 p[8];
238};
239
240struct extended_perms_decision {
241 u8 used;
242 u8 driver;
243 u8 base_perm;
244 struct extended_perms_data *allowed;
245 struct extended_perms_data *auditallow;
246 struct extended_perms_data *dontaudit;
247};
248
249struct extended_perms {
250 u16 len; /* length associated decision chain */
251 u8 base_perms; /* which base permissions are covered */
252 struct extended_perms_data drivers; /* flag drivers that are used */
253};
254
255/* definitions of av_decision.flags */
256#define AVD_FLAGS_PERMISSIVE 0x0001
257
258void security_compute_av(u32 ssid, u32 tsid, u16 tclass,
259 struct av_decision *avd,
260 struct extended_perms *xperms);
261
262void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, u8 driver,
263 u8 base_perm,
264 struct extended_perms_decision *xpermd);
265
266void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass,
267 struct av_decision *avd);
268
269int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
270 const struct qstr *qstr, u32 *out_sid);
271
272int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
273 const char *objname, u32 *out_sid);
274
275int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
276
277int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
278
279int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len);
280
281int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
282
283int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len);
284
285int security_context_to_sid(const char *scontext, u32 scontext_len,
286 u32 *out_sid, gfp_t gfp);
287
288int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
289
290int security_context_to_sid_default(const char *scontext, u32 scontext_len,
291 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
292
293int security_context_to_sid_force(const char *scontext, u32 scontext_len,
294 u32 *sid);
295
296int security_get_user_sids(u32 fromsid, const char *username, u32 **sids, u32 *nel);
297
298int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
299
300int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
301
302int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
303
304int security_netif_sid(char *name, u32 *if_sid);
305
306int security_node_sid(u16 domain, void *addr, u32 addrlen, u32 *out_sid);
307
308int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
309 u16 tclass);
310
311int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
312 u16 tclass);
313
314int security_bounded_transition(u32 old_sid, u32 new_sid);
315
316int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
317
318int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid,
319 u32 *peer_sid);
320
321int security_get_classes(struct selinux_policy *policy, char ***classes,
322 u32 *nclasses);
323int security_get_permissions(struct selinux_policy *policy, const char *class,
324 char ***perms, u32 *nperms);
325int security_get_reject_unknown(void);
326int security_get_allow_unknown(void);
327
328#define SECURITY_FS_USE_XATTR 1 /* use xattr */
329#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
330#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
331#define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
332#define SECURITY_FS_USE_NONE 5 /* no labeling support */
333#define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
334#define SECURITY_FS_USE_NATIVE 7 /* use native label support */
335#define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
336
337int security_fs_use(struct super_block *sb);
338
339int security_genfs_sid(const char *fstype, const char *path, u16 sclass,
340 u32 *sid);
341
342int selinux_policy_genfs_sid(struct selinux_policy *policy, const char *fstype,
343 const char *path, u16 sclass, u32 *sid);
344
345#ifdef CONFIG_NETLABEL
346int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
347 u32 *sid);
348
349int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr);
350#else
351static inline int
352security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid)
353{
354 return -EIDRM;
355}
356
357static inline int
358security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
359{
360 return -ENOENT;
361}
362#endif /* CONFIG_NETLABEL */
363
364const char *security_get_initial_sid_context(u32 sid);
365
366/*
367 * status notifier using mmap interface
368 */
369extern struct page *selinux_kernel_status_page(void);
370
371#define SELINUX_KERNEL_STATUS_VERSION 1
372struct selinux_kernel_status {
373 u32 version; /* version number of the structure */
374 u32 sequence; /* sequence number of seqlock logic */
375 u32 enforcing; /* current setting of enforcing mode */
376 u32 policyload; /* times of policy reloaded */
377 u32 deny_unknown; /* current setting of deny_unknown */
378 /*
379 * The version > 0 supports above members.
380 */
381} __packed;
382
383extern void selinux_status_update_setenforce(bool enforcing);
384extern void selinux_status_update_policyload(u32 seqno);
385extern void selinux_complete_init(void);
386extern struct path selinux_null;
387extern void selnl_notify_setenforce(int val);
388extern void selnl_notify_policyload(u32 seqno);
389extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
390
391extern void avtab_cache_init(void);
392extern void ebitmap_cache_init(void);
393extern void hashtab_cache_init(void);
394extern int security_sidtab_hash_stats(char *page);
395
396#endif /* _SELINUX_SECURITY_H_ */