Root/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_BUILD_CONTEXT, /* Create the per-task audit_context,
40                 * and fill it in at syscall
41                 * entry time. This makes a full
42                 * syscall record available if some
43                 * other part of the kernel decides it
44                 * should be recorded. */
45    AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
46                 * always fill it in at syscall entry
47                 * time, and always write out the audit
48                 * record at syscall exit time. */
49};
50
51/* Rule lists */
52struct audit_watch;
53struct audit_tree;
54struct audit_chunk;
55
56struct audit_entry {
57    struct list_head list;
58    struct rcu_head rcu;
59    struct audit_krule rule;
60};
61
62#ifdef CONFIG_AUDIT
63extern int audit_enabled;
64extern int audit_ever_enabled;
65#endif
66
67extern int audit_pid;
68
69#define AUDIT_INODE_BUCKETS 32
70extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
71
72static inline int audit_hash_ino(u32 ino)
73{
74    return (ino & (AUDIT_INODE_BUCKETS-1));
75}
76
77extern int audit_match_class(int class, unsigned syscall);
78extern int audit_comparator(const u32 left, const u32 op, const u32 right);
79extern int audit_compare_dname_path(const char *dname, const char *path,
80                    int *dirlen);
81extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
82                         int done, int multi,
83                         const void *payload, int size);
84extern void audit_panic(const char *message);
85
86struct audit_netlink_list {
87    int pid;
88    struct sk_buff_head q;
89};
90
91int audit_send_list(void *);
92
93extern int selinux_audit_rule_update(void);
94
95extern struct mutex audit_filter_mutex;
96extern void audit_free_rule_rcu(struct rcu_head *);
97extern struct list_head audit_filter_list[];
98
99extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
100
101/* audit watch functions */
102#ifdef CONFIG_AUDIT_WATCH
103extern void audit_put_watch(struct audit_watch *watch);
104extern void audit_get_watch(struct audit_watch *watch);
105extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
106extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
107extern void audit_remove_watch_rule(struct audit_krule *krule);
108extern char *audit_watch_path(struct audit_watch *watch);
109extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
110#else
111#define audit_put_watch(w) {}
112#define audit_get_watch(w) {}
113#define audit_to_watch(k, p, l, o) (-EINVAL)
114#define audit_add_watch(k, l) (-EINVAL)
115#define audit_remove_watch_rule(k) BUG()
116#define audit_watch_path(w) ""
117#define audit_watch_compare(w, i, d) 0
118
119#endif /* CONFIG_AUDIT_WATCH */
120
121#ifdef CONFIG_AUDIT_TREE
122extern struct audit_chunk *audit_tree_lookup(const struct inode *);
123extern void audit_put_chunk(struct audit_chunk *);
124extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
125extern int audit_make_tree(struct audit_krule *, char *, u32);
126extern int audit_add_tree_rule(struct audit_krule *);
127extern int audit_remove_tree_rule(struct audit_krule *);
128extern void audit_trim_trees(void);
129extern int audit_tag_tree(char *old, char *new);
130extern const char *audit_tree_path(struct audit_tree *);
131extern void audit_put_tree(struct audit_tree *);
132extern void audit_kill_trees(struct list_head *);
133#else
134#define audit_remove_tree_rule(rule) BUG()
135#define audit_add_tree_rule(rule) -EINVAL
136#define audit_make_tree(rule, str, op) -EINVAL
137#define audit_trim_trees() (void)0
138#define audit_put_tree(tree) (void)0
139#define audit_tag_tree(old, new) -EINVAL
140#define audit_tree_path(rule) "" /* never called */
141#define audit_kill_trees(list) BUG()
142#endif
143
144extern char *audit_unpack_string(void **, size_t *, size_t);
145
146extern pid_t audit_sig_pid;
147extern uid_t audit_sig_uid;
148extern u32 audit_sig_sid;
149
150#ifdef CONFIG_AUDITSYSCALL
151extern int __audit_signal_info(int sig, struct task_struct *t);
152static inline int audit_signal_info(int sig, struct task_struct *t)
153{
154    if (unlikely((audit_pid && t->tgid == audit_pid) ||
155             (audit_signals && !audit_dummy_context())))
156        return __audit_signal_info(sig, t);
157    return 0;
158}
159extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
160extern struct list_head *audit_killed_trees(void);
161#else
162#define audit_signal_info(s,t) AUDIT_DISABLED
163#define audit_filter_inodes(t,c) AUDIT_DISABLED
164#endif
165
166extern struct mutex audit_cmd_mutex;
167

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