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