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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>
9044e6bc 24#include <linux/skbuff.h>
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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. */
fe7752ba 39 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
997f5b64 40 * and fill it in at syscall
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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 */
cfcad62c 52struct audit_watch;
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53struct audit_tree;
54struct audit_chunk;
55
fe7752ba 56struct audit_entry {
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57 struct list_head list;
58 struct rcu_head rcu;
59 struct audit_krule rule;
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60};
61
c782f242 62extern int audit_ever_enabled;
c782f242 63
fe7752ba 64extern int audit_pid;
fe7752ba 65
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66#define AUDIT_INODE_BUCKETS 32
67extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
68
69static inline int audit_hash_ino(u32 ino)
70{
71 return (ino & (AUDIT_INODE_BUCKETS-1));
72}
73
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74/* Indicates that audit should log the full pathname. */
75#define AUDIT_NAME_FULL -1
76
55669bfa 77extern int audit_match_class(int class, unsigned syscall);
f368c07d 78extern int audit_comparator(const u32 left, const u32 op, const u32 right);
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79extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
80extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
bfcec708 81extern int parent_len(const char *path);
e3d6b07b 82extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
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83extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
84 int done, int multi,
b8800aa5 85 const void *payload, int size);
fe7752ba 86extern void audit_panic(const char *message);
3dc7e315 87
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88struct audit_netlink_list {
89 int pid;
90 struct sk_buff_head q;
91};
92
93int audit_send_list(void *);
94
3dc7e315 95extern int selinux_audit_rule_update(void);
e1396065 96
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97extern struct mutex audit_filter_mutex;
98extern void audit_free_rule_rcu(struct rcu_head *);
c782f242 99extern struct list_head audit_filter_list[];
74c3cbe3 100
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101extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
102
cfcad62c 103/* audit watch functions */
939a67fc 104#ifdef CONFIG_AUDIT_WATCH
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105extern void audit_put_watch(struct audit_watch *watch);
106extern void audit_get_watch(struct audit_watch *watch);
107extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
ae7b8f41 108extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
a05fb6cc 109extern void audit_remove_watch_rule(struct audit_krule *krule);
cfcad62c 110extern char *audit_watch_path(struct audit_watch *watch);
ae7b8f41 111extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
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112#else
113#define audit_put_watch(w) {}
114#define audit_get_watch(w) {}
115#define audit_to_watch(k, p, l, o) (-EINVAL)
116#define audit_add_watch(k, l) (-EINVAL)
117#define audit_remove_watch_rule(k) BUG()
118#define audit_watch_path(w) ""
119#define audit_watch_compare(w, i, d) 0
120
121#endif /* CONFIG_AUDIT_WATCH */
cfcad62c 122
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123#ifdef CONFIG_AUDIT_TREE
124extern struct audit_chunk *audit_tree_lookup(const struct inode *);
125extern void audit_put_chunk(struct audit_chunk *);
126extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
127extern int audit_make_tree(struct audit_krule *, char *, u32);
128extern int audit_add_tree_rule(struct audit_krule *);
129extern int audit_remove_tree_rule(struct audit_krule *);
130extern void audit_trim_trees(void);
131extern int audit_tag_tree(char *old, char *new);
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132extern const char *audit_tree_path(struct audit_tree *);
133extern void audit_put_tree(struct audit_tree *);
916d7576 134extern void audit_kill_trees(struct list_head *);
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135#else
136#define audit_remove_tree_rule(rule) BUG()
137#define audit_add_tree_rule(rule) -EINVAL
138#define audit_make_tree(rule, str, op) -EINVAL
139#define audit_trim_trees() (void)0
140#define audit_put_tree(tree) (void)0
141#define audit_tag_tree(old, new) -EINVAL
142#define audit_tree_path(rule) "" /* never called */
916d7576 143#define audit_kill_trees(list) BUG()
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144#endif
145
146extern char *audit_unpack_string(void **, size_t *, size_t);
147
c782f242 148extern pid_t audit_sig_pid;
cca080d9 149extern kuid_t audit_sig_uid;
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150extern u32 audit_sig_sid;
151
e1396065 152#ifdef CONFIG_AUDITSYSCALL
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153extern int __audit_signal_info(int sig, struct task_struct *t);
154static inline int audit_signal_info(int sig, struct task_struct *t)
e1396065 155{
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156 if (unlikely((audit_pid && t->tgid == audit_pid) ||
157 (audit_signals && !audit_dummy_context())))
158 return __audit_signal_info(sig, t);
159 return 0;
e1396065 160}
0590b933 161extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
916d7576 162extern struct list_head *audit_killed_trees(void);
e1396065 163#else
e54dc243 164#define audit_signal_info(s,t) AUDIT_DISABLED
f368c07d 165#define audit_filter_inodes(t,c) AUDIT_DISABLED
e1396065 166#endif
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167
168extern struct mutex audit_cmd_mutex;