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David Woodhousefe7752b2005-12-15 18:33:52 +00001/* 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>
Al Viro9044e6b2006-05-22 01:09:24 -040024#include <linux/skbuff.h>
David Woodhousefe7752b2005-12-15 18:33:52 +000025
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 */
Amy Griffisf368c07d2006-04-07 16:55:56 -040056struct 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
Al Viro74c3cbe2007-07-22 08:04:18 -040068struct audit_tree;
69struct audit_chunk;
70
David Woodhousefe7752b2005-12-15 18:33:52 +000071struct audit_entry {
Amy Griffis93315ed2006-02-07 12:05:27 -050072 struct list_head list;
73 struct rcu_head rcu;
74 struct audit_krule rule;
David Woodhousefe7752b2005-12-15 18:33:52 +000075};
76
David Woodhousefe7752b2005-12-15 18:33:52 +000077extern int audit_pid;
David Woodhousefe7752b2005-12-15 18:33:52 +000078
Amy Griffisf368c07d2006-04-07 16:55:56 -040079#define AUDIT_INODE_BUCKETS 32
80extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
81
82static inline int audit_hash_ino(u32 ino)
83{
84 return (ino & (AUDIT_INODE_BUCKETS-1));
85}
86
Al Viro55669bf2006-08-31 19:26:40 -040087extern int audit_match_class(int class, unsigned syscall);
Amy Griffisf368c07d2006-04-07 16:55:56 -040088extern int audit_comparator(const u32 left, const u32 op, const u32 right);
Amy Griffis9c937dc2006-06-08 23:19:31 -040089extern int audit_compare_dname_path(const char *dname, const char *path,
90 int *dirlen);
Al Viro9044e6b2006-05-22 01:09:24 -040091extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
92 int done, int multi,
93 void *payload, int size);
David Woodhousefe7752b2005-12-15 18:33:52 +000094extern void audit_send_reply(int pid, int seq, int type,
95 int done, int multi,
96 void *payload, int size);
David Woodhousefe7752b2005-12-15 18:33:52 +000097extern void audit_panic(const char *message);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -060098
Al Viro9044e6b2006-05-22 01:09:24 -040099struct audit_netlink_list {
100 int pid;
101 struct sk_buff_head q;
102};
103
104int audit_send_list(void *);
105
Amy Griffisf368c07d2006-04-07 16:55:56 -0400106struct inotify_watch;
107extern void audit_free_parent(struct inotify_watch *);
108extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
109 const char *, struct inode *);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600110extern int selinux_audit_rule_update(void);
Al Viroe1396062006-05-25 10:19:47 -0400111
Al Viro74c3cbe2007-07-22 08:04:18 -0400112extern struct mutex audit_filter_mutex;
113extern void audit_free_rule_rcu(struct rcu_head *);
114
115#ifdef CONFIG_AUDIT_TREE
116extern struct audit_chunk *audit_tree_lookup(const struct inode *);
117extern void audit_put_chunk(struct audit_chunk *);
118extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
119extern int audit_make_tree(struct audit_krule *, char *, u32);
120extern int audit_add_tree_rule(struct audit_krule *);
121extern int audit_remove_tree_rule(struct audit_krule *);
122extern void audit_trim_trees(void);
123extern int audit_tag_tree(char *old, char *new);
124extern void audit_schedule_prune(void);
125extern void audit_prune_trees(void);
126extern const char *audit_tree_path(struct audit_tree *);
127extern void audit_put_tree(struct audit_tree *);
128#else
129#define audit_remove_tree_rule(rule) BUG()
130#define audit_add_tree_rule(rule) -EINVAL
131#define audit_make_tree(rule, str, op) -EINVAL
132#define audit_trim_trees() (void)0
133#define audit_put_tree(tree) (void)0
134#define audit_tag_tree(old, new) -EINVAL
135#define audit_tree_path(rule) "" /* never called */
136#endif
137
138extern char *audit_unpack_string(void **, size_t *, size_t);
139
Al Viroe1396062006-05-25 10:19:47 -0400140#ifdef CONFIG_AUDITSYSCALL
Amy Griffise54dc242007-03-29 18:01:04 -0400141extern int __audit_signal_info(int sig, struct task_struct *t);
142static inline int audit_signal_info(int sig, struct task_struct *t)
Al Viroe1396062006-05-25 10:19:47 -0400143{
Amy Griffise54dc242007-03-29 18:01:04 -0400144 if (unlikely((audit_pid && t->tgid == audit_pid) ||
145 (audit_signals && !audit_dummy_context())))
146 return __audit_signal_info(sig, t);
147 return 0;
Al Viroe1396062006-05-25 10:19:47 -0400148}
Amy Griffisf368c07d2006-04-07 16:55:56 -0400149extern enum audit_state audit_filter_inodes(struct task_struct *,
150 struct audit_context *);
151extern void audit_set_auditable(struct audit_context *);
Al Viroe1396062006-05-25 10:19:47 -0400152#else
Amy Griffise54dc242007-03-29 18:01:04 -0400153#define audit_signal_info(s,t) AUDIT_DISABLED
Amy Griffisf368c07d2006-04-07 16:55:56 -0400154#define audit_filter_inodes(t,c) AUDIT_DISABLED
155#define audit_set_auditable(c)
Al Viroe1396062006-05-25 10:19:47 -0400156#endif