blob: 815d6f5c04ee041e0c33b52b84480152ec1ab548 [file] [log] [blame]
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
Amy Griffis93315ed2006-02-07 12:05:27 -050068struct audit_field {
Darrel Goeddel3dc7e312006-03-10 18:14:06 -060069 u32 type;
70 u32 val;
71 u32 op;
72 char *se_str;
73 struct selinux_audit_rule *se_rule;
Amy Griffis93315ed2006-02-07 12:05:27 -050074};
75
76struct audit_krule {
77 int vers_ops;
78 u32 flags;
79 u32 listnr;
80 u32 action;
81 u32 mask[AUDIT_BITMASK_SIZE];
82 u32 buflen; /* for data alloc on list rules */
83 u32 field_count;
Amy Griffis5adc8a62006-06-14 18:45:21 -040084 char *filterkey; /* ties events to rules */
Amy Griffis93315ed2006-02-07 12:05:27 -050085 struct audit_field *fields;
Amy Griffise54dc242007-03-29 18:01:04 -040086 struct audit_field *arch_f; /* quick access to arch field */
Amy Griffisf368c07d2006-04-07 16:55:56 -040087 struct audit_field *inode_f; /* quick access to an inode field */
88 struct audit_watch *watch; /* associated watch */
89 struct list_head rlist; /* entry in audit_watch.rules list */
Amy Griffis93315ed2006-02-07 12:05:27 -050090};
91
David Woodhousefe7752b2005-12-15 18:33:52 +000092struct audit_entry {
Amy Griffis93315ed2006-02-07 12:05:27 -050093 struct list_head list;
94 struct rcu_head rcu;
95 struct audit_krule rule;
David Woodhousefe7752b2005-12-15 18:33:52 +000096};
97
David Woodhousefe7752b2005-12-15 18:33:52 +000098extern int audit_pid;
David Woodhousefe7752b2005-12-15 18:33:52 +000099
Amy Griffisf368c07d2006-04-07 16:55:56 -0400100#define AUDIT_INODE_BUCKETS 32
101extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
102
103static inline int audit_hash_ino(u32 ino)
104{
105 return (ino & (AUDIT_INODE_BUCKETS-1));
106}
107
Al Viro55669bf2006-08-31 19:26:40 -0400108extern int audit_match_class(int class, unsigned syscall);
Amy Griffisf368c07d2006-04-07 16:55:56 -0400109extern int audit_comparator(const u32 left, const u32 op, const u32 right);
Amy Griffis9c937dc2006-06-08 23:19:31 -0400110extern int audit_compare_dname_path(const char *dname, const char *path,
111 int *dirlen);
Al Viro9044e6b2006-05-22 01:09:24 -0400112extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
113 int done, int multi,
114 void *payload, int size);
David Woodhousefe7752b2005-12-15 18:33:52 +0000115extern void audit_send_reply(int pid, int seq, int type,
116 int done, int multi,
117 void *payload, int size);
118extern void audit_log_lost(const char *message);
119extern void audit_panic(const char *message);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600120
Al Viro9044e6b2006-05-22 01:09:24 -0400121struct audit_netlink_list {
122 int pid;
123 struct sk_buff_head q;
124};
125
126int audit_send_list(void *);
127
Amy Griffisf368c07d2006-04-07 16:55:56 -0400128struct inotify_watch;
129extern void audit_free_parent(struct inotify_watch *);
130extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
131 const char *, struct inode *);
Darrel Goeddel3dc7e312006-03-10 18:14:06 -0600132extern int selinux_audit_rule_update(void);
Al Viroe1396062006-05-25 10:19:47 -0400133
134#ifdef CONFIG_AUDITSYSCALL
Amy Griffise54dc242007-03-29 18:01:04 -0400135extern int __audit_signal_info(int sig, struct task_struct *t);
136static inline int audit_signal_info(int sig, struct task_struct *t)
Al Viroe1396062006-05-25 10:19:47 -0400137{
Amy Griffise54dc242007-03-29 18:01:04 -0400138 if (unlikely((audit_pid && t->tgid == audit_pid) ||
139 (audit_signals && !audit_dummy_context())))
140 return __audit_signal_info(sig, t);
141 return 0;
Al Viroe1396062006-05-25 10:19:47 -0400142}
Amy Griffisf368c07d2006-04-07 16:55:56 -0400143extern enum audit_state audit_filter_inodes(struct task_struct *,
144 struct audit_context *);
145extern void audit_set_auditable(struct audit_context *);
Al Viroe1396062006-05-25 10:19:47 -0400146#else
Amy Griffise54dc242007-03-29 18:01:04 -0400147#define audit_signal_info(s,t) AUDIT_DISABLED
Amy Griffisf368c07d2006-04-07 16:55:56 -0400148#define audit_filter_inodes(t,c) AUDIT_DISABLED
149#define audit_set_auditable(c)
Al Viroe1396062006-05-25 10:19:47 -0400150#endif