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1/*
2 * Access vector cache interface for object managers.
3 *
4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
5 */
6#ifndef _SELINUX_AVC_H_
7#define _SELINUX_AVC_H_
8
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>
18#include "flask.h"
19#include "av_permissions.h"
20#include "security.h"
21
22#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
23extern int selinux_enforcing;
24#else
25#define selinux_enforcing 1
26#endif
27
28/*
29 * An entry in the AVC.
30 */
31struct avc_entry;
32
33struct task_struct;
34struct inode;
35struct sock;
36struct sk_buff;
37
38/*
39 * AVC statistics
40 */
41struct avc_cache_stats {
42 unsigned int lookups;
43 unsigned int misses;
44 unsigned int allocations;
45 unsigned int reclaims;
46 unsigned int frees;
47};
48
49/*
50 * We only need this data after we have decided to send an audit message.
51 */
52struct selinux_audit_data {
53 u32 ssid;
54 u32 tsid;
55 u16 tclass;
56 u32 requested;
57 u32 audited;
58 u32 denied;
59 int result;
60};
61
62/*
63 * AVC operations
64 */
65
66void __init avc_init(void);
67
68static inline u32 avc_audit_required(u32 requested,
69 struct av_decision *avd,
70 int result,
71 u32 auditdeny,
72 u32 *deniedp)
73{
74 u32 denied, audited;
75 denied = requested & ~avd->allowed;
76 if (unlikely(denied)) {
77 audited = denied & avd->auditdeny;
78 /*
79 * auditdeny is TRICKY! Setting a bit in
80 * this field means that ANY denials should NOT be audited if
81 * the policy contains an explicit dontaudit rule for that
82 * permission. Take notice that this is unrelated to the
83 * actual permissions that were denied. As an example lets
84 * assume:
85 *
86 * denied == READ
87 * avd.auditdeny & ACCESS == 0 (not set means explicit rule)
88 * auditdeny & ACCESS == 1
89 *
90 * We will NOT audit the denial even though the denied
91 * permission was READ and the auditdeny checks were for
92 * ACCESS
93 */
94 if (auditdeny && !(auditdeny & avd->auditdeny))
95 audited = 0;
96 } else if (result)
97 audited = denied = requested;
98 else
99 audited = requested & avd->auditallow;
100 *deniedp = denied;
101 return audited;
102}
103
104int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass,
105 u32 requested, u32 audited, u32 denied, int result,
106 struct common_audit_data *a,
107 unsigned flags);
108
109/**
110 * avc_audit - Audit the granting or denial of permissions.
111 * @ssid: source security identifier
112 * @tsid: target security identifier
113 * @tclass: target security class
114 * @requested: requested permissions
115 * @avd: access vector decisions
116 * @result: result from avc_has_perm_noaudit
117 * @a: auxiliary audit data
118 * @flags: VFS walk flags
119 *
120 * Audit the granting or denial of permissions in accordance
121 * with the policy. This function is typically called by
122 * avc_has_perm() after a permission check, but can also be
123 * called directly by callers who use avc_has_perm_noaudit()
124 * in order to separate the permission check from the auditing.
125 * For example, this separation is useful when the permission check must
126 * be performed under a lock, to allow the lock to be released
127 * before calling the auditing code.
128 */
129static inline int avc_audit(u32 ssid, u32 tsid,
130 u16 tclass, u32 requested,
131 struct av_decision *avd,
132 int result,
133 struct common_audit_data *a,
134 int flags)
135{
136 u32 audited, denied;
137 audited = avc_audit_required(requested, avd, result, 0, &denied);
138 if (likely(!audited))
139 return 0;
140 return slow_avc_audit(ssid, tsid, tclass,
141 requested, audited, denied, result,
142 a, flags);
143}
144
145#define AVC_STRICT 1 /* Ignore permissive mode. */
146#define AVC_EXTENDED_PERMS 2 /* update extended permissions */
147int avc_has_perm_noaudit(u32 ssid, u32 tsid,
148 u16 tclass, u32 requested,
149 unsigned flags,
150 struct av_decision *avd);
151
152int avc_has_perm(u32 ssid, u32 tsid,
153 u16 tclass, u32 requested,
154 struct common_audit_data *auditdata);
155int avc_has_perm_flags(u32 ssid, u32 tsid,
156 u16 tclass, u32 requested,
157 struct common_audit_data *auditdata,
158 int flags);
159
160int avc_has_extended_perms(u32 ssid, u32 tsid, u16 tclass, u32 requested,
161 u8 driver, u8 perm, struct common_audit_data *ad);
162
163
164u32 avc_policy_seqno(void);
165
166#define AVC_CALLBACK_GRANT 1
167#define AVC_CALLBACK_TRY_REVOKE 2
168#define AVC_CALLBACK_REVOKE 4
169#define AVC_CALLBACK_RESET 8
170#define AVC_CALLBACK_AUDITALLOW_ENABLE 16
171#define AVC_CALLBACK_AUDITALLOW_DISABLE 32
172#define AVC_CALLBACK_AUDITDENY_ENABLE 64
173#define AVC_CALLBACK_AUDITDENY_DISABLE 128
174#define AVC_CALLBACK_ADD_XPERMS 256
175
176int avc_add_callback(int (*callback)(u32 event), u32 events);
177
178/* Exported to selinuxfs */
179int avc_get_hash_stats(char *page);
180extern unsigned int avc_cache_threshold;
181
182/* Attempt to free avc node cache */
183void avc_disable(void);
184
185#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
186DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
187#endif
188
189#endif /* _SELINUX_AVC_H_ */
190
1/*
2 * Access vector cache interface for object managers.
3 *
4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
5 */
6#ifndef _SELINUX_AVC_H_
7#define _SELINUX_AVC_H_
8
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>
18#include <asm/system.h>
19#include "flask.h"
20#include "av_permissions.h"
21#include "security.h"
22
23#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
24extern int selinux_enforcing;
25#else
26#define selinux_enforcing 1
27#endif
28
29/*
30 * An entry in the AVC.
31 */
32struct avc_entry;
33
34struct task_struct;
35struct inode;
36struct sock;
37struct sk_buff;
38
39/*
40 * AVC statistics
41 */
42struct avc_cache_stats {
43 unsigned int lookups;
44 unsigned int misses;
45 unsigned int allocations;
46 unsigned int reclaims;
47 unsigned int frees;
48};
49
50/*
51 * AVC operations
52 */
53
54void __init avc_init(void);
55
56int avc_audit(u32 ssid, u32 tsid,
57 u16 tclass, u32 requested,
58 struct av_decision *avd,
59 int result,
60 struct common_audit_data *a, unsigned flags);
61
62#define AVC_STRICT 1 /* Ignore permissive mode. */
63int avc_has_perm_noaudit(u32 ssid, u32 tsid,
64 u16 tclass, u32 requested,
65 unsigned flags,
66 struct av_decision *avd);
67
68int avc_has_perm_flags(u32 ssid, u32 tsid,
69 u16 tclass, u32 requested,
70 struct common_audit_data *auditdata,
71 unsigned);
72
73static inline int avc_has_perm(u32 ssid, u32 tsid,
74 u16 tclass, u32 requested,
75 struct common_audit_data *auditdata)
76{
77 return avc_has_perm_flags(ssid, tsid, tclass, requested, auditdata, 0);
78}
79
80u32 avc_policy_seqno(void);
81
82#define AVC_CALLBACK_GRANT 1
83#define AVC_CALLBACK_TRY_REVOKE 2
84#define AVC_CALLBACK_REVOKE 4
85#define AVC_CALLBACK_RESET 8
86#define AVC_CALLBACK_AUDITALLOW_ENABLE 16
87#define AVC_CALLBACK_AUDITALLOW_DISABLE 32
88#define AVC_CALLBACK_AUDITDENY_ENABLE 64
89#define AVC_CALLBACK_AUDITDENY_DISABLE 128
90
91int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
92 u16 tclass, u32 perms,
93 u32 *out_retained),
94 u32 events, u32 ssid, u32 tsid,
95 u16 tclass, u32 perms);
96
97/* Exported to selinuxfs */
98int avc_get_hash_stats(char *page);
99extern unsigned int avc_cache_threshold;
100
101/* Attempt to free avc node cache */
102void avc_disable(void);
103
104#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
105DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
106#endif
107
108#endif /* _SELINUX_AVC_H_ */
109