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_parent;
57
58 struct 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
68 struct audit_field {
69 u32 type;
70 u32 val;
71 u32 op;
72 char *se_str;
73 struct selinux_audit_rule *se_rule;
74 };
75
76 struct audit_tree;
77 struct audit_chunk;
78
79 struct audit_krule {
80 int vers_ops;
81 u32 flags;
82 u32 listnr;
83 u32 action;
84 u32 mask[AUDIT_BITMASK_SIZE];
85 u32 buflen; /* for data alloc on list rules */
86 u32 field_count;
87 char *filterkey; /* ties events to rules */
88 struct audit_field *fields;
89 struct audit_field *arch_f; /* quick access to arch field */
90 struct audit_field *inode_f; /* quick access to an inode field */
91 struct audit_watch *watch; /* associated watch */
92 struct audit_tree *tree; /* associated watched tree */
93 struct list_head rlist; /* entry in audit_{watch,tree}.rules list */
94 };
95
96 struct audit_entry {
97 struct list_head list;
98 struct rcu_head rcu;
99 struct audit_krule rule;
100 };
101
102 extern int audit_pid;
103
104 #define AUDIT_INODE_BUCKETS 32
105 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
106
107 static inline int audit_hash_ino(u32 ino)
108 {
109 return (ino & (AUDIT_INODE_BUCKETS-1));
110 }
111
112 extern int audit_match_class(int class, unsigned syscall);
113 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
114 extern int audit_compare_dname_path(const char *dname, const char *path,
115 int *dirlen);
116 extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
117 int done, int multi,
118 void *payload, int size);
119 extern void audit_send_reply(int pid, int seq, int type,
120 int done, int multi,
121 void *payload, int size);
122 extern void audit_panic(const char *message);
123
124 struct audit_netlink_list {
125 int pid;
126 struct sk_buff_head q;
127 };
128
129 int audit_send_list(void *);
130
131 struct inotify_watch;
132 extern void audit_free_parent(struct inotify_watch *);
133 extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
134 const char *, struct inode *);
135 extern int selinux_audit_rule_update(void);
136
137 extern struct mutex audit_filter_mutex;
138 extern void audit_free_rule_rcu(struct rcu_head *);
139
140 #ifdef CONFIG_AUDIT_TREE
141 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
142 extern void audit_put_chunk(struct audit_chunk *);
143 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
144 extern int audit_make_tree(struct audit_krule *, char *, u32);
145 extern int audit_add_tree_rule(struct audit_krule *);
146 extern int audit_remove_tree_rule(struct audit_krule *);
147 extern void audit_trim_trees(void);
148 extern int audit_tag_tree(char *old, char *new);
149 extern void audit_schedule_prune(void);
150 extern void audit_prune_trees(void);
151 extern const char *audit_tree_path(struct audit_tree *);
152 extern void audit_put_tree(struct audit_tree *);
153 #else
154 #define audit_remove_tree_rule(rule) BUG()
155 #define audit_add_tree_rule(rule) -EINVAL
156 #define audit_make_tree(rule, str, op) -EINVAL
157 #define audit_trim_trees() (void)0
158 #define audit_put_tree(tree) (void)0
159 #define audit_tag_tree(old, new) -EINVAL
160 #define audit_tree_path(rule) "" /* never called */
161 #endif
162
163 extern char *audit_unpack_string(void **, size_t *, size_t);
164
165 #ifdef CONFIG_AUDITSYSCALL
166 extern int __audit_signal_info(int sig, struct task_struct *t);
167 static inline int audit_signal_info(int sig, struct task_struct *t)
168 {
169 if (unlikely((audit_pid && t->tgid == audit_pid) ||
170 (audit_signals && !audit_dummy_context())))
171 return __audit_signal_info(sig, t);
172 return 0;
173 }
174 extern enum audit_state audit_filter_inodes(struct task_struct *,
175 struct audit_context *);
176 extern void audit_set_auditable(struct audit_context *);
177 #else
178 #define audit_signal_info(s,t) AUDIT_DISABLED
179 #define audit_filter_inodes(t,c) AUDIT_DISABLED
180 #define audit_set_auditable(c)
181 #endif
182
|
This page was automatically generated by the
LXR engine.
|