kernel/audit.h

   1 /* audit -- definition of audit_context structure and supporting types
   2  *
   3  * Copyright 2003-2004 Red Hat, Inc.
   4  * Copyright 2005 Hewlett-Packard Development Company, L.P.
   5  * Copyright 2005 IBM Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/fs.h>
  23 #include <linux/audit.h>
  24 #include <linux/skbuff.h>
  25
  26 /* 0 = no checking
  27    1 = put_count checking
  28    2 = verbose put_count checking
  29 */
  30 #define AUDIT_DEBUG 0
  31
  32 /* At task start time, the audit_state is set in the audit_context using
  33    a per-task filter.  At syscall entry, the audit_state is augmented by
  34    the syscall filter. */
  35 enum audit_state {
  36         AUDIT_DISABLED,         /* Do not create per-task audit_context.
  37                                  * No syscall-specific audit records can
  38                                  * be generated. */
  39         AUDIT_SETUP_CONTEXT,    /* Create the per-task audit_context,
  40                                  * but don't necessarily fill it in at
  41                                  * syscall entry time (i.e., filter
  42                                  * instead). */
  43         AUDIT_BUILD_CONTEXT,    /* Create the per-task audit_context,
  44                                  * and always fill it in at syscall
  45                                  * entry time.  This makes a full
  46                                  * syscall record available if some
  47                                  * other part of the kernel decides it
  48                                  * should be recorded. */
  49         AUDIT_RECORD_CONTEXT    /* Create the per-task audit_context,
  50                                  * always fill it in at syscall entry
  51                                  * time, and always write out the audit
  52                                  * record at syscall exit time.  */
  53 };
  54
  55 /* Rule lists */
  56 struct audit_parent;
  57
  58 struct audit_watch {
  59         atomic_t                count;  /* reference count */
  60         char                    *path;  /* insertion path */
  61         dev_t                   dev;    /* associated superblock device */
  62         unsigned long           ino;    /* associated inode number */
  63         struct audit_parent     *parent; /* associated parent */
  64         struct list_head        wlist;  /* entry in parent->watches list */
  65         struct list_head        rules;  /* associated rules */
  66 };
  67
  68 struct audit_tree;
  69 struct audit_chunk;
  70
  71 struct audit_entry {
  72         struct list_head        list;
  73         struct rcu_head         rcu;
  74         struct audit_krule      rule;
  75 };
  76
  77 #ifdef CONFIG_AUDIT
  78 extern int audit_enabled;
  79 extern int audit_ever_enabled;
  80 #endif
  81
  82 extern int audit_pid;
  83
  84 #define AUDIT_INODE_BUCKETS     32
  85 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
  86
  87 static inline int audit_hash_ino(u32 ino)
  88 {
  89         return (ino & (AUDIT_INODE_BUCKETS-1));
  90 }
  91
  92 extern int audit_match_class(int class, unsigned syscall);
  93 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
  94 extern int audit_compare_dname_path(const char *dname, const char *path,
  95                                     int *dirlen);
  96 extern struct sk_buff *     audit_make_reply(int pid, int seq, int type,
  97                                              int done, int multi,
  98                                              void *payload, int size);
  99 extern void                 audit_send_reply(int pid, int seq, int type,
 100                                              int done, int multi,
 101                                              void *payload, int size);
 102 extern void                 audit_panic(const char *message);
 103
 104 struct audit_netlink_list {
 105         int pid;
 106         struct sk_buff_head q;
 107 };
 108
 109 int audit_send_list(void *);
 110
 111 struct inotify_watch;
 112 /* Inotify handle */
 113 extern struct inotify_handle *audit_ih;
 114
 115 extern void audit_free_parent(struct inotify_watch *);
 116 extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
 117                                 const char *, struct inode *);
 118 extern int selinux_audit_rule_update(void);
 119
 120 extern struct mutex audit_filter_mutex;
 121 extern void audit_free_rule_rcu(struct rcu_head *);
 122 extern struct list_head audit_filter_list[];
 123
 124 #ifdef CONFIG_AUDIT_TREE
 125 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
 126 extern void audit_put_chunk(struct audit_chunk *);
 127 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
 128 extern int audit_make_tree(struct audit_krule *, char *, u32);
 129 extern int audit_add_tree_rule(struct audit_krule *);
 130 extern int audit_remove_tree_rule(struct audit_krule *);
 131 extern void audit_trim_trees(void);
 132 extern int audit_tag_tree(char *old, char *new);
 133 extern void audit_schedule_prune(void);
 134 extern void audit_prune_trees(void);
 135 extern const char *audit_tree_path(struct audit_tree *);
 136 extern void audit_put_tree(struct audit_tree *);
 137 #else
 138 #define audit_remove_tree_rule(rule) BUG()
 139 #define audit_add_tree_rule(rule) -EINVAL
 140 #define audit_make_tree(rule, str, op) -EINVAL
 141 #define audit_trim_trees() (void)0
 142 #define audit_put_tree(tree) (void)0
 143 #define audit_tag_tree(old, new) -EINVAL
 144 #define audit_tree_path(rule) ""        /* never called */
 145 #endif
 146
 147 extern char *audit_unpack_string(void **, size_t *, size_t);
 148
 149 extern pid_t audit_sig_pid;
 150 extern uid_t audit_sig_uid;
 151 extern u32 audit_sig_sid;
 152
 153 #ifdef CONFIG_AUDITSYSCALL
 154 extern int __audit_signal_info(int sig, struct task_struct *t);
 155 static inline int audit_signal_info(int sig, struct task_struct *t)
 156 {
 157         if (unlikely((audit_pid && t->tgid == audit_pid) ||
 158                      (audit_signals && !audit_dummy_context())))
 159                 return __audit_signal_info(sig, t);
 160         return 0;
 161 }
 162 extern enum audit_state audit_filter_inodes(struct task_struct *,
 163                                             struct audit_context *);
 164 extern void audit_set_auditable(struct audit_context *);
 165 #else
 166 #define audit_signal_info(s,t) AUDIT_DISABLED
 167 #define audit_filter_inodes(t,c) AUDIT_DISABLED
 168 #define audit_set_auditable(c)
 169 #endif