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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Security server interface.
4 *
5 * Author : Stephen Smalley, <[email protected]>
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
78struct netlbl_lsm_secattr;
79
80extern 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
92struct selinux_policy;
93
94struct 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
108void selinux_avc_init(void);
109
110extern struct selinux_state selinux_state;
111
112static 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
118static 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
125static inline bool enforcing_enabled(void)
126{
127 return READ_ONCE(selinux_state.enforcing);
128}
129
130static inline void enforcing_set(bool value)
131{
132 WRITE_ONCE(selinux_state.enforcing, value);
133}
134#else
135static inline bool enforcing_enabled(void)
136{
137 return true;
138}
139
140static inline void enforcing_set(bool value)
141{
142}
143#endif
144
145static inline bool checkreqprot_get(void)
146{
147 /* non-zero/true checkreqprot values are no longer supported */
148 return 0;
149}
150
151static inline bool selinux_policycap_netpeer(void)
152{
153 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_NETPEER]);
154}
155
156static inline bool selinux_policycap_openperm(void)
157{
158 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_OPENPERM]);
159}
160
161static inline bool selinux_policycap_extsockclass(void)
162{
163 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_EXTSOCKCLASS]);
164}
165
166static inline bool selinux_policycap_alwaysnetwork(void)
167{
168 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_ALWAYSNETWORK]);
169}
170
171static inline bool selinux_policycap_cgroupseclabel(void)
172{
173 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_CGROUPSECLABEL]);
174}
175
176static inline bool selinux_policycap_nnp_nosuid_transition(void)
177{
178 return READ_ONCE(
179 selinux_state.policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
180}
181
182static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
183{
184 return READ_ONCE(
185 selinux_state.policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
186}
187
188static inline bool selinux_policycap_ioctl_skip_cloexec(void)
189{
190 return READ_ONCE(
191 selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
192}
193
194static inline bool selinux_policycap_userspace_initial_context(void)
195{
196 return READ_ONCE(
197 selinux_state.policycap[POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT]);
198}
199
200static inline bool selinux_policycap_netlink_xperm(void)
201{
202 return READ_ONCE(
203 selinux_state.policycap[POLICYDB_CAP_NETLINK_XPERM]);
204}
205
206static inline bool selinux_policycap_functionfs_seclabel(void)
207{
208 return READ_ONCE(
209 selinux_state.policycap[POLICYDB_CAP_FUNCTIONFS_SECLABEL]);
210}
211
212static inline bool selinux_policycap_memfd_class(void)
213{
214 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_MEMFD_CLASS]);
215}
216
217static inline bool selinux_policycap_bpf_token_perms(void)
218{
219 return READ_ONCE(
220 selinux_state.policycap[POLICYDB_CAP_BPF_TOKEN_PERMS]);
221}
222
223struct selinux_policy_convert_data;
224
225struct selinux_load_state {
226 struct selinux_policy *policy;
227 struct selinux_policy_convert_data *convert_data;
228};
229
230int security_mls_enabled(void);
231int security_load_policy(void *data, size_t len,
232 struct selinux_load_state *load_state);
233void selinux_policy_commit(struct selinux_load_state *load_state);
234void selinux_policy_cancel(struct selinux_load_state *load_state);
235int security_read_policy(void **data, size_t *len);
236int security_read_state_kernel(void **data, size_t *len);
237int security_policycap_supported(unsigned int req_cap);
238
239/* Maximum supported number of permissions per class */
240#define SEL_VEC_MAX 32
241struct av_decision {
242 u32 allowed;
243 u32 auditallow;
244 u32 auditdeny;
245 u32 seqno;
246 u32 flags;
247};
248
249#define XPERMS_ALLOWED 1
250#define XPERMS_AUDITALLOW 2
251#define XPERMS_DONTAUDIT 4
252
253#define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x)&0x1f))
254#define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x)&0x1f)))
255struct extended_perms_data {
256 u32 p[8];
257};
258
259struct extended_perms_decision {
260 u8 used;
261 u8 driver;
262 u8 base_perm;
263 struct extended_perms_data *allowed;
264 struct extended_perms_data *auditallow;
265 struct extended_perms_data *dontaudit;
266};
267
268struct extended_perms {
269 u16 len; /* length associated decision chain */
270 u8 base_perms; /* which base permissions are covered */
271 struct extended_perms_data drivers; /* flag drivers that are used */
272};
273
274/* definitions of av_decision.flags */
275#define AVD_FLAGS_PERMISSIVE 0x0001
276#define AVD_FLAGS_NEVERAUDIT 0x0002
277
278void security_compute_av(u32 ssid, u32 tsid, u16 tclass,
279 struct av_decision *avd,
280 struct extended_perms *xperms);
281
282void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, u8 driver,
283 u8 base_perm,
284 struct extended_perms_decision *xpermd);
285
286void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass,
287 struct av_decision *avd);
288
289int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
290 const struct qstr *qstr, u32 *out_sid);
291
292int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
293 const char *objname, u32 *out_sid);
294
295int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
296
297int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
298
299int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len);
300
301int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
302
303int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len);
304
305int security_context_to_sid(const char *scontext, u32 scontext_len,
306 u32 *out_sid, gfp_t gfp);
307
308int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
309
310int security_context_to_sid_default(const char *scontext, u32 scontext_len,
311 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
312
313int security_context_to_sid_force(const char *scontext, u32 scontext_len,
314 u32 *sid);
315
316int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
317
318int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
319
320int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
321
322int security_netif_sid(const char *name, u32 *if_sid);
323
324int security_node_sid(u16 domain, const void *addr, u32 addrlen, u32 *out_sid);
325
326int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
327 u16 tclass);
328
329int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
330 u16 tclass);
331
332int security_bounded_transition(u32 old_sid, u32 new_sid);
333
334int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
335
336int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid,
337 u32 *peer_sid);
338
339int security_get_classes(struct selinux_policy *policy, char ***classes,
340 u32 *nclasses);
341int security_get_permissions(struct selinux_policy *policy, const char *class,
342 char ***perms, u32 *nperms);
343int security_get_reject_unknown(void);
344int security_get_allow_unknown(void);
345
346#define SECURITY_FS_USE_XATTR 1 /* use xattr */
347#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
348#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
349#define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
350#define SECURITY_FS_USE_NONE 5 /* no labeling support */
351#define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
352#define SECURITY_FS_USE_NATIVE 7 /* use native label support */
353#define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
354
355int security_fs_use(struct super_block *sb);
356
357int security_genfs_sid(const char *fstype, const char *path, u16 sclass,
358 u32 *sid);
359
360int selinux_policy_genfs_sid(struct selinux_policy *policy, const char *fstype,
361 const char *path, u16 sclass, u32 *sid);
362
363#ifdef CONFIG_NETLABEL
364int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
365 u32 *sid);
366
367int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr);
368#else
369static inline int
370security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid)
371{
372 return -EIDRM;
373}
374
375static inline int
376security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
377{
378 return -ENOENT;
379}
380#endif /* CONFIG_NETLABEL */
381
382const char *security_get_initial_sid_context(u32 sid);
383
384/*
385 * status notifier using mmap interface
386 */
387extern struct page *selinux_kernel_status_page(void);
388
389#define SELINUX_KERNEL_STATUS_VERSION 1
390struct selinux_kernel_status {
391 u32 version; /* version number of the structure */
392 u32 sequence; /* sequence number of seqlock logic */
393 u32 enforcing; /* current setting of enforcing mode */
394 u32 policyload; /* times of policy reloaded */
395 u32 deny_unknown; /* current setting of deny_unknown */
396 /*
397 * The version > 0 supports above members.
398 */
399} __packed;
400
401extern void selinux_status_update_setenforce(bool enforcing);
402extern void selinux_status_update_policyload(u32 seqno);
403extern void selinux_complete_init(void);
404extern struct path selinux_null;
405extern void selnl_notify_setenforce(int val);
406extern void selnl_notify_policyload(u32 seqno);
407extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
408
409extern void avtab_cache_init(void);
410extern void ebitmap_cache_init(void);
411extern void hashtab_cache_init(void);
412extern int security_sidtab_hash_stats(char *page);
413
414#endif /* _SELINUX_SECURITY_H_ */