security.h

  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
 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
217struct selinux_policy_convert_data;
218
219struct selinux_load_state {
220	struct selinux_policy *policy;
221	struct selinux_policy_convert_data *convert_data;
222};
223
224int security_mls_enabled(void);
225int security_load_policy(void *data, size_t len,
226			 struct selinux_load_state *load_state);
227void selinux_policy_commit(struct selinux_load_state *load_state);
228void selinux_policy_cancel(struct selinux_load_state *load_state);
229int security_read_policy(void **data, size_t *len);
230int security_read_state_kernel(void **data, size_t *len);
231int security_policycap_supported(unsigned int req_cap);
232
233#define SEL_VEC_MAX 32
234struct av_decision {
235	u32 allowed;
236	u32 auditallow;
237	u32 auditdeny;
238	u32 seqno;
239	u32 flags;
240};
241
242#define XPERMS_ALLOWED	  1
243#define XPERMS_AUDITALLOW 2
244#define XPERMS_DONTAUDIT  4
245
246#define security_xperm_set(perms, x)  ((perms)[(x) >> 5] |= 1 << ((x)&0x1f))
247#define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x)&0x1f)))
248struct extended_perms_data {
249	u32 p[8];
250};
251
252struct extended_perms_decision {
253	u8 used;
254	u8 driver;
255	u8 base_perm;
256	struct extended_perms_data *allowed;
257	struct extended_perms_data *auditallow;
258	struct extended_perms_data *dontaudit;
259};
260
261struct extended_perms {
262	u16 len; /* length associated decision chain */
263	u8 base_perms; /* which base permissions are covered */
264	struct extended_perms_data drivers; /* flag drivers that are used */
265};
266
267/* definitions of av_decision.flags */
268#define AVD_FLAGS_PERMISSIVE 0x0001
269#define AVD_FLAGS_NEVERAUDIT  0x0002
270
271void security_compute_av(u32 ssid, u32 tsid, u16 tclass,
272			 struct av_decision *avd,
273			 struct extended_perms *xperms);
274
275void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, u8 driver,
276				      u8 base_perm,
277				      struct extended_perms_decision *xpermd);
278
279void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass,
280			      struct av_decision *avd);
281
282int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
283			    const struct qstr *qstr, u32 *out_sid);
284
285int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
286				 const char *objname, u32 *out_sid);
287
288int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
289
290int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
291
292int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len);
293
294int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
295
296int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len);
297
298int security_context_to_sid(const char *scontext, u32 scontext_len,
299			    u32 *out_sid, gfp_t gfp);
300
301int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
302
303int security_context_to_sid_default(const char *scontext, u32 scontext_len,
304				    u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
305
306int security_context_to_sid_force(const char *scontext, u32 scontext_len,
307				  u32 *sid);
308
309int security_get_user_sids(u32 fromsid, const char *username, u32 **sids, u32 *nel);
310
311int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
312
313int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
314
315int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
316
317int security_netif_sid(const char *name, u32 *if_sid);
318
319int security_node_sid(u16 domain, const void *addr, u32 addrlen, u32 *out_sid);
320
321int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
322				 u16 tclass);
323
324int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
325				      u16 tclass);
326
327int security_bounded_transition(u32 old_sid, u32 new_sid);
328
329int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
330
331int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid,
332				 u32 *peer_sid);
333
334int security_get_classes(struct selinux_policy *policy, char ***classes,
335			 u32 *nclasses);
336int security_get_permissions(struct selinux_policy *policy, const char *class,
337			     char ***perms, u32 *nperms);
338int security_get_reject_unknown(void);
339int security_get_allow_unknown(void);
340
341#define SECURITY_FS_USE_XATTR	 1 /* use xattr */
342#define SECURITY_FS_USE_TRANS	 2 /* use transition SIDs, e.g. devpts/tmpfs */
343#define SECURITY_FS_USE_TASK	 3 /* use task SIDs, e.g. pipefs/sockfs */
344#define SECURITY_FS_USE_GENFS	 4 /* use the genfs support */
345#define SECURITY_FS_USE_NONE	 5 /* no labeling support */
346#define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
347#define SECURITY_FS_USE_NATIVE	 7 /* use native label support */
348#define SECURITY_FS_USE_MAX	 7 /* Highest SECURITY_FS_USE_XXX */
349
350int security_fs_use(struct super_block *sb);
351
352int security_genfs_sid(const char *fstype, const char *path, u16 sclass,
353		       u32 *sid);
354
355int selinux_policy_genfs_sid(struct selinux_policy *policy, const char *fstype,
356			     const char *path, u16 sclass, u32 *sid);
357
358#ifdef CONFIG_NETLABEL
359int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
360				   u32 *sid);
361
362int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr);
363#else
364static inline int
365security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid)
366{
367	return -EIDRM;
368}
369
370static inline int
371security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
372{
373	return -ENOENT;
374}
375#endif /* CONFIG_NETLABEL */
376
377const char *security_get_initial_sid_context(u32 sid);
378
379/*
380 * status notifier using mmap interface
381 */
382extern struct page *selinux_kernel_status_page(void);
383
384#define SELINUX_KERNEL_STATUS_VERSION 1
385struct selinux_kernel_status {
386	u32 version; /* version number of the structure */
387	u32 sequence; /* sequence number of seqlock logic */
388	u32 enforcing; /* current setting of enforcing mode */
389	u32 policyload; /* times of policy reloaded */
390	u32 deny_unknown; /* current setting of deny_unknown */
391	/*
392	 * The version > 0 supports above members.
393	 */
394} __packed;
395
396extern void selinux_status_update_setenforce(bool enforcing);
397extern void selinux_status_update_policyload(u32 seqno);
398extern void selinux_complete_init(void);
399extern struct path selinux_null;
400extern void selnl_notify_setenforce(int val);
401extern void selnl_notify_policyload(u32 seqno);
402extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
403
404extern void avtab_cache_init(void);
405extern void ebitmap_cache_init(void);
406extern void hashtab_cache_init(void);
407extern int security_sidtab_hash_stats(char *page);
408
409#endif /* _SELINUX_SECURITY_H_ */