LXR linux/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. */
  35enum 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 */
  56struct audit_parent;
  57
  58struct 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
  68struct audit_field {
  69        u32                             type;
  70        u32                             val;
  71        u32                             op;
  72        char                            *se_str;
  73        struct selinux_audit_rule       *se_rule;
  74};
  75
  76struct audit_tree;
  77struct audit_chunk;
  78
  79struct 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
  96struct audit_entry {
  97        struct list_head        list;
  98        struct rcu_head         rcu;
  99        struct audit_krule      rule;
 100};
 101
 102extern int audit_pid;
 103
 104#define AUDIT_INODE_BUCKETS     32
 105extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
 106
 107static inline int audit_hash_ino(u32 ino)
 108{
 109        return (ino & (AUDIT_INODE_BUCKETS-1));
 110}
 111
 112extern int audit_match_class(int class, unsigned syscall);
 113extern int audit_comparator(const u32 left, const u32 op, const u32 right);
 114extern int audit_compare_dname_path(const char *dname, const char *path,
 115                                    int *dirlen);
 116extern struct sk_buff *     audit_make_reply(int pid, int seq, int type,
 117                                             int done, int multi,
 118                                             void *payload, int size);
 119extern void                 audit_send_reply(int pid, int seq, int type,
 120                                             int done, int multi,
 121                                             void *payload, int size);
 122extern void                 audit_panic(const char *message);
 123
 124struct audit_netlink_list {
 125        int pid;
 126        struct sk_buff_head q;
 127};
 128
 129int audit_send_list(void *);
 130
 131struct inotify_watch;
 132extern void audit_free_parent(struct inotify_watch *);
 133extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
 134                                const char *, struct inode *);
 135extern int selinux_audit_rule_update(void);
 136
 137extern struct mutex audit_filter_mutex;
 138extern void audit_free_rule_rcu(struct rcu_head *);
 139
 140#ifdef CONFIG_AUDIT_TREE
 141extern struct audit_chunk *audit_tree_lookup(const struct inode *);
 142extern void audit_put_chunk(struct audit_chunk *);
 143extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
 144extern int audit_make_tree(struct audit_krule *, char *, u32);
 145extern int audit_add_tree_rule(struct audit_krule *);
 146extern int audit_remove_tree_rule(struct audit_krule *);
 147extern void audit_trim_trees(void);
 148extern int audit_tag_tree(char *old, char *new);
 149extern void audit_schedule_prune(void);
 150extern void audit_prune_trees(void);
 151extern const char *audit_tree_path(struct audit_tree *);
 152extern 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
 163extern char *audit_unpack_string(void **, size_t *, size_t);
 164
 165#ifdef CONFIG_AUDITSYSCALL
 166extern int __audit_signal_info(int sig, struct task_struct *t);
 167static 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}
 174extern enum audit_state audit_filter_inodes(struct task_struct *,
 175                                            struct audit_context *);
 176extern 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
 182