security/selinux/include/avc.h

   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
  23 extern int selinux_enforcing;
  24 #else
  25 #define selinux_enforcing 1
  26 #endif
  27
  28 /*
  29  * An entry in the AVC.
  30  */
  31 struct avc_entry;
  32
  33 struct task_struct;
  34 struct inode;
  35 struct sock;
  36 struct sk_buff;
  37
  38 /*
  39  * AVC statistics
  40  */
  41 struct 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  */
  52 struct selinux_late_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  * We collect this at the beginning or during an selinux security operation
  64  */
  65 struct selinux_audit_data {
  66         /*
  67          * auditdeny is a bit tricky and unintuitive.  See the
  68          * comments in avc.c for it's meaning and usage.
  69          */
  70         u32 auditdeny;
  71         struct selinux_late_audit_data *slad;
  72 };
  73
  74 /*
  75  * AVC operations
  76  */
  77
  78 void __init avc_init(void);
  79
  80 int avc_audit(u32 ssid, u32 tsid,
  81                u16 tclass, u32 requested,
  82                struct av_decision *avd,
  83                int result,
  84               struct common_audit_data *a, unsigned flags);
  85
  86 #define AVC_STRICT 1 /* Ignore permissive mode. */
  87 int avc_has_perm_noaudit(u32 ssid, u32 tsid,
  88                          u16 tclass, u32 requested,
  89                          unsigned flags,
  90                          struct av_decision *avd);
  91
  92 int avc_has_perm_flags(u32 ssid, u32 tsid,
  93                        u16 tclass, u32 requested,
  94                        struct common_audit_data *auditdata,
  95                        unsigned);
  96
  97 static inline int avc_has_perm(u32 ssid, u32 tsid,
  98                                u16 tclass, u32 requested,
  99                                struct common_audit_data *auditdata)
 100 {
 101         return avc_has_perm_flags(ssid, tsid, tclass, requested, auditdata, 0);
 102 }
 103
 104 u32 avc_policy_seqno(void);
 105
 106 #define AVC_CALLBACK_GRANT              1
 107 #define AVC_CALLBACK_TRY_REVOKE         2
 108 #define AVC_CALLBACK_REVOKE             4
 109 #define AVC_CALLBACK_RESET              8
 110 #define AVC_CALLBACK_AUDITALLOW_ENABLE  16
 111 #define AVC_CALLBACK_AUDITALLOW_DISABLE 32
 112 #define AVC_CALLBACK_AUDITDENY_ENABLE   64
 113 #define AVC_CALLBACK_AUDITDENY_DISABLE  128
 114
 115 int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
 116                                      u16 tclass, u32 perms,
 117                                      u32 *out_retained),
 118                      u32 events, u32 ssid, u32 tsid,
 119                      u16 tclass, u32 perms);
 120
 121 /* Exported to selinuxfs */
 122 int avc_get_hash_stats(char *page);
 123 extern unsigned int avc_cache_threshold;
 124
 125 /* Attempt to free avc node cache */
 126 void avc_disable(void);
 127
 128 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
 129 DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
 130 #endif
 131
 132 #endif /* _SELINUX_AVC_H_ */
 133