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_field {
  69         u32                             type;
  70         u32                             val;
  71         u32                             op;
  72         char                            *se_str;
  73         struct selinux_audit_rule       *se_rule;
  74 };
  75
  76 struct audit_tree;
  77 struct audit_chunk;
  78
  79 struct audit_krule {
  80         int                     vers_ops;
  81         u32                     flags;
  82         u32                     listnr;
  83         u32                     action;
  84         u32                     mask[AUDIT_BITMASK_SIZE];
  85         u32                     buflen; /* for data alloc on list rules */
  86         u32                     field_count;
  87         char                    *filterkey; /* ties events to rules */
  88         struct audit_field      *fields;
  89         struct audit_field      *arch_f; /* quick access to arch field */
  90         struct audit_field      *inode_f; /* quick access to an inode field */
  91         struct audit_watch      *watch; /* associated watch */
  92         struct audit_tree       *tree;  /* associated watched tree */
  93         struct list_head        rlist;  /* entry in audit_{watch,tree}.rules list */
  94 };
  95
  96 struct audit_entry {
  97         struct list_head        list;
  98         struct rcu_head         rcu;
  99         struct audit_krule      rule;
 100 };
 101
 102 extern int audit_pid;
 103
 104 #define AUDIT_INODE_BUCKETS     32
 105 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
 106
 107 static inline int audit_hash_ino(u32 ino)
 108 {
 109         return (ino & (AUDIT_INODE_BUCKETS-1));
 110 }
 111
 112 extern int audit_match_class(int class, unsigned syscall);
 113 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
 114 extern int audit_compare_dname_path(const char *dname, const char *path,
 115                                     int *dirlen);
 116 extern struct sk_buff *     audit_make_reply(int pid, int seq, int type,
 117                                              int done, int multi,
 118                                              void *payload, int size);
 119 extern void                 audit_send_reply(int pid, int seq, int type,
 120                                              int done, int multi,
 121                                              void *payload, int size);
 122 extern void                 audit_panic(const char *message);
 123
 124 struct audit_netlink_list {
 125         int pid;
 126         struct sk_buff_head q;
 127 };
 128
 129 int audit_send_list(void *);
 130
 131 struct inotify_watch;
 132 extern void audit_free_parent(struct inotify_watch *);
 133 extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
 134                                 const char *, struct inode *);
 135 extern int selinux_audit_rule_update(void);
 136
 137 extern struct mutex audit_filter_mutex;
 138 extern void audit_free_rule_rcu(struct rcu_head *);
 139
 140 #ifdef CONFIG_AUDIT_TREE
 141 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
 142 extern void audit_put_chunk(struct audit_chunk *);
 143 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
 144 extern int audit_make_tree(struct audit_krule *, char *, u32);
 145 extern int audit_add_tree_rule(struct audit_krule *);
 146 extern int audit_remove_tree_rule(struct audit_krule *);
 147 extern void audit_trim_trees(void);
 148 extern int audit_tag_tree(char *old, char *new);
 149 extern void audit_schedule_prune(void);
 150 extern void audit_prune_trees(void);
 151 extern const char *audit_tree_path(struct audit_tree *);
 152 extern void audit_put_tree(struct audit_tree *);
 153 #else
 154 #define audit_remove_tree_rule(rule) BUG()
 155 #define audit_add_tree_rule(rule) -EINVAL
 156 #define audit_make_tree(rule, str, op) -EINVAL
 157 #define audit_trim_trees() (void)0
 158 #define audit_put_tree(tree) (void)0
 159 #define audit_tag_tree(old, new) -EINVAL
 160 #define audit_tree_path(rule) ""        /* never called */
 161 #endif
 162
 163 extern char *audit_unpack_string(void **, size_t *, size_t);
 164
 165 #ifdef CONFIG_AUDITSYSCALL
 166 extern int __audit_signal_info(int sig, struct task_struct *t);
 167 static inline int audit_signal_info(int sig, struct task_struct *t)
 168 {
 169         if (unlikely((audit_pid && t->tgid == audit_pid) ||
 170                      (audit_signals && !audit_dummy_context())))
 171                 return __audit_signal_info(sig, t);
 172         return 0;
 173 }
 174 extern enum audit_state audit_filter_inodes(struct task_struct *,
 175                                             struct audit_context *);
 176 extern void audit_set_auditable(struct audit_context *);
 177 #else
 178 #define audit_signal_info(s,t) AUDIT_DISABLED
 179 #define audit_filter_inodes(t,c) AUDIT_DISABLED
 180 #define audit_set_auditable(c)
 181 #endif