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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>
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_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 */
52 struct audit_watch;
53 struct audit_tree;
54 struct audit_chunk;
55
56 struct audit_entry {
57 struct list_head list;
58 struct rcu_head rcu;
59 struct audit_krule rule;
60 };
61
62 extern int audit_ever_enabled;
63
64 extern int audit_pid;
65
66 #define AUDIT_INODE_BUCKETS 32
67 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
68
69 static inline int audit_hash_ino(u32 ino)
70 {
71 return (ino & (AUDIT_INODE_BUCKETS-1));
72 }
73
74 /* Indicates that audit should log the full pathname. */
75 #define AUDIT_NAME_FULL -1
76
77 extern int audit_match_class(int class, unsigned syscall);
78 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
79 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
80 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
81 extern int parent_len(const char *path);
82 extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
83 extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
84 int done, int multi,
85 const void *payload, int size);
86 extern void audit_panic(const char *message);
87
88 struct audit_netlink_list {
89 int pid;
90 struct sk_buff_head q;
91 };
92
93 int audit_send_list(void *);
94
95 extern int selinux_audit_rule_update(void);
96
97 extern struct mutex audit_filter_mutex;
98 extern void audit_free_rule_rcu(struct rcu_head *);
99 extern struct list_head audit_filter_list[];
100
101 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
102
103 /* audit watch functions */
104 #ifdef CONFIG_AUDIT_WATCH
105 extern void audit_put_watch(struct audit_watch *watch);
106 extern void audit_get_watch(struct audit_watch *watch);
107 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
108 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
109 extern void audit_remove_watch_rule(struct audit_krule *krule);
110 extern char *audit_watch_path(struct audit_watch *watch);
111 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
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 */
122
123 #ifdef CONFIG_AUDIT_TREE
124 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
125 extern void audit_put_chunk(struct audit_chunk *);
126 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
127 extern int audit_make_tree(struct audit_krule *, char *, u32);
128 extern int audit_add_tree_rule(struct audit_krule *);
129 extern int audit_remove_tree_rule(struct audit_krule *);
130 extern void audit_trim_trees(void);
131 extern int audit_tag_tree(char *old, char *new);
132 extern const char *audit_tree_path(struct audit_tree *);
133 extern void audit_put_tree(struct audit_tree *);
134 extern void audit_kill_trees(struct list_head *);
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 */
143 #define audit_kill_trees(list) BUG()
144 #endif
145
146 extern char *audit_unpack_string(void **, size_t *, size_t);
147
148 extern pid_t audit_sig_pid;
149 extern kuid_t audit_sig_uid;
150 extern u32 audit_sig_sid;
151
152 #ifdef CONFIG_AUDITSYSCALL
153 extern int __audit_signal_info(int sig, struct task_struct *t);
154 static inline int audit_signal_info(int sig, struct task_struct *t)
155 {
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;
160 }
161 extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
162 extern struct list_head *audit_killed_trees(void);
163 #else
164 #define audit_signal_info(s,t) AUDIT_DISABLED
165 #define audit_filter_inodes(t,c) AUDIT_DISABLED
166 #endif
167
168 extern struct mutex audit_cmd_mutex;