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