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_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_watch;
57struct audit_tree;
58struct audit_chunk;
59
60struct audit_entry {
61    struct list_head list;
62    struct rcu_head rcu;
63    struct audit_krule rule;
64};
65
66#ifdef CONFIG_AUDIT
67extern int audit_enabled;
68extern int audit_ever_enabled;
69#endif
70
71extern int audit_pid;
72
73#define AUDIT_INODE_BUCKETS 32
74extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
75
76static inline int audit_hash_ino(u32 ino)
77{
78    return (ino & (AUDIT_INODE_BUCKETS-1));
79}
80
81extern int audit_match_class(int class, unsigned syscall);
82extern int audit_comparator(const u32 left, const u32 op, const u32 right);
83extern int audit_compare_dname_path(const char *dname, const char *path,
84                    int *dirlen);
85extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
86                         int done, int multi,
87                         void *payload, int size);
88extern void audit_send_reply(int pid, int seq, int type,
89                         int done, int multi,
90                         void *payload, int size);
91extern void audit_panic(const char *message);
92
93struct audit_netlink_list {
94    int pid;
95    struct sk_buff_head q;
96};
97
98int audit_send_list(void *);
99
100extern int selinux_audit_rule_update(void);
101
102extern struct mutex audit_filter_mutex;
103extern void audit_free_rule_rcu(struct rcu_head *);
104extern struct list_head audit_filter_list[];
105
106extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
107
108/* audit watch functions */
109#ifdef CONFIG_AUDIT_WATCH
110extern void audit_put_watch(struct audit_watch *watch);
111extern void audit_get_watch(struct audit_watch *watch);
112extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
113extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
114extern void audit_remove_watch_rule(struct audit_krule *krule);
115extern char *audit_watch_path(struct audit_watch *watch);
116extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
117#else
118#define audit_put_watch(w) {}
119#define audit_get_watch(w) {}
120#define audit_to_watch(k, p, l, o) (-EINVAL)
121#define audit_add_watch(k, l) (-EINVAL)
122#define audit_remove_watch_rule(k) BUG()
123#define audit_watch_path(w) ""
124#define audit_watch_compare(w, i, d) 0
125
126#endif /* CONFIG_AUDIT_WATCH */
127
128#ifdef CONFIG_AUDIT_TREE
129extern struct audit_chunk *audit_tree_lookup(const struct inode *);
130extern void audit_put_chunk(struct audit_chunk *);
131extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
132extern int audit_make_tree(struct audit_krule *, char *, u32);
133extern int audit_add_tree_rule(struct audit_krule *);
134extern int audit_remove_tree_rule(struct audit_krule *);
135extern void audit_trim_trees(void);
136extern int audit_tag_tree(char *old, char *new);
137extern const char *audit_tree_path(struct audit_tree *);
138extern void audit_put_tree(struct audit_tree *);
139extern void audit_kill_trees(struct list_head *);
140#else
141#define audit_remove_tree_rule(rule) BUG()
142#define audit_add_tree_rule(rule) -EINVAL
143#define audit_make_tree(rule, str, op) -EINVAL
144#define audit_trim_trees() (void)0
145#define audit_put_tree(tree) (void)0
146#define audit_tag_tree(old, new) -EINVAL
147#define audit_tree_path(rule) "" /* never called */
148#define audit_kill_trees(list) BUG()
149#endif
150
151extern char *audit_unpack_string(void **, size_t *, size_t);
152
153extern pid_t audit_sig_pid;
154extern uid_t audit_sig_uid;
155extern u32 audit_sig_sid;
156
157#ifdef CONFIG_AUDITSYSCALL
158extern int __audit_signal_info(int sig, struct task_struct *t);
159static inline int audit_signal_info(int sig, struct task_struct *t)
160{
161    if (unlikely((audit_pid && t->tgid == audit_pid) ||
162             (audit_signals && !audit_dummy_context())))
163        return __audit_signal_info(sig, t);
164    return 0;
165}
166extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
167extern struct list_head *audit_killed_trees(void);
168#else
169#define audit_signal_info(s,t) AUDIT_DISABLED
170#define audit_filter_inodes(t,c) AUDIT_DISABLED
171#endif
172
173extern struct mutex audit_cmd_mutex;
174

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