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/in6.h>
  16 #include <asm/system.h>
  17 #include "flask.h"
  18 #include "av_permissions.h"
  19 #include "security.h"
  20
  21 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
  22 extern int selinux_enforcing;
  23 #else
  24 #define selinux_enforcing 1
  25 #endif
  26
  27 /*
  28  * An entry in the AVC.
  29  */
  30 struct avc_entry;
  31
  32 /*
  33  * A reference to an AVC entry.
  34  */
  35 struct avc_entry_ref {
  36         struct avc_entry *ae;
  37 };
  38
  39 /* Initialize an AVC entry reference before first use. */
  40 static inline void avc_entry_ref_init(struct avc_entry_ref *h)
  41 {
  42         h->ae = NULL;
  43 }
  44
  45 struct task_struct;
  46 struct vfsmount;
  47 struct dentry;
  48 struct inode;
  49 struct sock;
  50 struct sk_buff;
  51
  52 /* Auxiliary data to use in generating the audit record. */
  53 struct avc_audit_data {
  54         char    type;
  55 #define AVC_AUDIT_DATA_FS   1
  56 #define AVC_AUDIT_DATA_NET  2
  57 #define AVC_AUDIT_DATA_CAP  3
  58 #define AVC_AUDIT_DATA_IPC  4
  59         struct task_struct *tsk;
  60         union   {
  61                 struct {
  62                         struct vfsmount *mnt;
  63                         struct dentry *dentry;
  64                         struct inode *inode;
  65                 } fs;
  66                 struct {
  67                         char *netif;
  68                         struct sock *sk;
  69                         u16 family;
  70                         u16 dport;
  71                         u16 sport;
  72                         union {
  73                                 struct {
  74                                         u32 daddr;
  75                                         u32 saddr;
  76                                 } v4;
  77                                 struct {
  78                                         struct in6_addr daddr;
  79                                         struct in6_addr saddr;
  80                                 } v6;
  81                         } fam;
  82                 } net;
  83                 int cap;
  84                 int ipc_id;
  85         } u;
  86 };
  87
  88 #define v4info fam.v4
  89 #define v6info fam.v6
  90
  91 /* Initialize an AVC audit data structure. */
  92 #define AVC_AUDIT_DATA_INIT(_d,_t) \
  93         { memset((_d), 0, sizeof(struct avc_audit_data)); (_d)->type = AVC_AUDIT_DATA_##_t; }
  94
  95 /*
  96  * AVC statistics
  97  */
  98 #define AVC_ENTRY_LOOKUPS        0
  99 #define AVC_ENTRY_HITS           1
 100 #define AVC_ENTRY_MISSES         2
 101 #define AVC_ENTRY_DISCARDS       3
 102 #define AVC_CAV_LOOKUPS          4
 103 #define AVC_CAV_HITS             5
 104 #define AVC_CAV_PROBES           6
 105 #define AVC_CAV_MISSES           7
 106 #define AVC_NSTATS               8
 107
 108 /*
 109  * AVC display support
 110  */
 111 struct audit_buffer;
 112 void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av);
 113 void avc_dump_query(struct audit_buffer *ab, u32 ssid, u32 tsid, u16 tclass);
 114
 115 /*
 116  * AVC operations
 117  */
 118
 119 void __init avc_init(void);
 120
 121 int avc_lookup(u32 ssid, u32 tsid, u16 tclass,
 122                u32 requested, struct avc_entry_ref *aeref);
 123
 124 int avc_insert(u32 ssid, u32 tsid, u16 tclass,
 125                struct avc_entry *ae, struct avc_entry_ref *out_aeref);
 126
 127 void avc_audit(u32 ssid, u32 tsid,
 128                u16 tclass, u32 requested,
 129                struct av_decision *avd, int result, struct avc_audit_data *auditdata);
 130
 131 int avc_has_perm_noaudit(u32 ssid, u32 tsid,
 132                          u16 tclass, u32 requested,
 133                          struct avc_entry_ref *aeref, struct av_decision *avd);
 134
 135 int avc_has_perm(u32 ssid, u32 tsid,
 136                  u16 tclass, u32 requested,
 137                  struct avc_entry_ref *aeref, struct avc_audit_data *auditdata);
 138
 139 #define AVC_CALLBACK_GRANT              1
 140 #define AVC_CALLBACK_TRY_REVOKE         2
 141 #define AVC_CALLBACK_REVOKE             4
 142 #define AVC_CALLBACK_RESET              8
 143 #define AVC_CALLBACK_AUDITALLOW_ENABLE  16
 144 #define AVC_CALLBACK_AUDITALLOW_DISABLE 32
 145 #define AVC_CALLBACK_AUDITDENY_ENABLE   64
 146 #define AVC_CALLBACK_AUDITDENY_DISABLE  128
 147
 148 int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
 149                                      u16 tclass, u32 perms,
 150                                      u32 *out_retained),
 151                      u32 events, u32 ssid, u32 tsid,
 152                      u16 tclass, u32 perms);
 153
 154 #endif /* _SELINUX_AVC_H_ */
 155