2 * Access vector cache interface for object managers.
4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
6 #ifndef _SELINUX_AVC_H_
7 #define _SELINUX_AVC_H_
9 #include <linux/stddef.h>
10 #include <linux/errno.h>
11 #include <linux/kernel.h>
12 #include <linux/kdev_t.h>
13 #include <linux/spinlock.h>
14 #include <linux/init.h>
15 #include <linux/audit.h>
16 #include <linux/lsm_audit.h>
17 #include <linux/in6.h>
19 #include "av_permissions.h"
22 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
23 extern int selinux_enforcing;
25 #define selinux_enforcing 1
29 * An entry in the AVC.
41 struct avc_cache_stats {
44 unsigned int allocations;
45 unsigned int reclaims;
50 * We only need this data after we have decided to send an audit message.
52 struct selinux_late_audit_data {
63 * We collect this at the beginning or during an selinux security operation
65 struct selinux_audit_data {
66 struct selinux_late_audit_data *slad;
73 void __init avc_init(void);
75 static inline u32 avc_audit_required(u32 requested,
76 struct av_decision *avd,
82 denied = requested & ~avd->allowed;
83 if (unlikely(denied)) {
84 audited = denied & avd->auditdeny;
86 * auditdeny is TRICKY! Setting a bit in
87 * this field means that ANY denials should NOT be audited if
88 * the policy contains an explicit dontaudit rule for that
89 * permission. Take notice that this is unrelated to the
90 * actual permissions that were denied. As an example lets
94 * avd.auditdeny & ACCESS == 0 (not set means explicit rule)
95 * auditdeny & ACCESS == 1
97 * We will NOT audit the denial even though the denied
98 * permission was READ and the auditdeny checks were for
101 if (auditdeny && !(auditdeny & avd->auditdeny))
104 audited = denied = requested;
106 audited = requested & avd->auditallow;
111 int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass,
112 u32 requested, u32 audited, u32 denied,
113 struct common_audit_data *a,
117 * avc_audit - Audit the granting or denial of permissions.
118 * @ssid: source security identifier
119 * @tsid: target security identifier
120 * @tclass: target security class
121 * @requested: requested permissions
122 * @avd: access vector decisions
123 * @result: result from avc_has_perm_noaudit
124 * @a: auxiliary audit data
125 * @flags: VFS walk flags
127 * Audit the granting or denial of permissions in accordance
128 * with the policy. This function is typically called by
129 * avc_has_perm() after a permission check, but can also be
130 * called directly by callers who use avc_has_perm_noaudit()
131 * in order to separate the permission check from the auditing.
132 * For example, this separation is useful when the permission check must
133 * be performed under a lock, to allow the lock to be released
134 * before calling the auditing code.
136 static inline int avc_audit(u32 ssid, u32 tsid,
137 u16 tclass, u32 requested,
138 struct av_decision *avd,
140 struct common_audit_data *a, unsigned flags)
143 audited = avc_audit_required(requested, avd, result, 0, &denied);
144 if (likely(!audited))
146 return slow_avc_audit(ssid, tsid, tclass,
147 requested, audited, denied,
151 #define AVC_STRICT 1 /* Ignore permissive mode. */
152 int avc_has_perm_noaudit(u32 ssid, u32 tsid,
153 u16 tclass, u32 requested,
155 struct av_decision *avd);
157 int avc_has_perm_flags(u32 ssid, u32 tsid,
158 u16 tclass, u32 requested,
159 struct common_audit_data *auditdata,
162 static inline int avc_has_perm(u32 ssid, u32 tsid,
163 u16 tclass, u32 requested,
164 struct common_audit_data *auditdata)
166 return avc_has_perm_flags(ssid, tsid, tclass, requested, auditdata, 0);
169 u32 avc_policy_seqno(void);
171 #define AVC_CALLBACK_GRANT 1
172 #define AVC_CALLBACK_TRY_REVOKE 2
173 #define AVC_CALLBACK_REVOKE 4
174 #define AVC_CALLBACK_RESET 8
175 #define AVC_CALLBACK_AUDITALLOW_ENABLE 16
176 #define AVC_CALLBACK_AUDITALLOW_DISABLE 32
177 #define AVC_CALLBACK_AUDITDENY_ENABLE 64
178 #define AVC_CALLBACK_AUDITDENY_DISABLE 128
180 int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
181 u16 tclass, u32 perms,
183 u32 events, u32 ssid, u32 tsid,
184 u16 tclass, u32 perms);
186 /* Exported to selinuxfs */
187 int avc_get_hash_stats(char *page);
188 extern unsigned int avc_cache_threshold;
190 /* Attempt to free avc node cache */
191 void avc_disable(void);
193 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
194 DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
197 #endif /* _SELINUX_AVC_H_ */