1/* $Id: audit-linux.c,v 1.1 2011/01/17 10:15:30 dtucker Exp $ */
2
3/*
4 * Copyright 2010 Red Hat, Inc.  All rights reserved.
5 * Use is subject to license terms.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * Red Hat author: Jan F. Chadima <jchadima@redhat.com>
28 */
29
30#include "includes.h"
31#if defined(USE_LINUX_AUDIT)
32#include <libaudit.h>
33#include <unistd.h>
34#include <string.h>
35
36#include "log.h"
37#include "audit.h"
38#include "canohost.h"
39
40const char* audit_username(void);
41
42int
43linux_audit_record_event(int uid, const char *username,
44    const char *hostname, const char *ip, const char *ttyn, int success)
45{
46	int audit_fd, rc, saved_errno;
47
48	audit_fd = audit_open();
49	if (audit_fd < 0) {
50		if (errno == EINVAL || errno == EPROTONOSUPPORT ||
51		    errno == EAFNOSUPPORT)
52			return 1; /* No audit support in kernel */
53		else
54			return 0; /* Must prevent login */
55	}
56	rc = audit_log_acct_message(audit_fd, AUDIT_USER_LOGIN,
57	    NULL, "login", username ? username : "(unknown)",
58	    username == NULL ? uid : -1, hostname, ip, ttyn, success);
59	saved_errno = errno;
60	close(audit_fd);
61	/*
62	 * Do not report error if the error is EPERM and sshd is run as non
63	 * root user.
64	 */
65	if ((rc == -EPERM) && (geteuid() != 0))
66		rc = 0;
67	errno = saved_errno;
68	return (rc >= 0);
69}
70
71/* Below is the sshd audit API code */
72
73void
74audit_connection_from(const char *host, int port)
75{
76}
77	/* not implemented */
78
79void
80audit_run_command(const char *command)
81{
82	/* not implemented */
83}
84
85void
86audit_session_open(struct logininfo *li)
87{
88	if (linux_audit_record_event(li->uid, NULL, li->hostname,
89	    NULL, li->line, 1) == 0)
90		fatal("linux_audit_write_entry failed: %s", strerror(errno));
91}
92
93void
94audit_session_close(struct logininfo *li)
95{
96	/* not implemented */
97}
98
99void
100audit_event(ssh_audit_event_t event)
101{
102	switch(event) {
103	case SSH_AUTH_SUCCESS:
104	case SSH_CONNECTION_CLOSE:
105	case SSH_NOLOGIN:
106	case SSH_LOGIN_EXCEED_MAXTRIES:
107	case SSH_LOGIN_ROOT_DENIED:
108		break;
109
110	case SSH_AUTH_FAIL_NONE:
111	case SSH_AUTH_FAIL_PASSWD:
112	case SSH_AUTH_FAIL_KBDINT:
113	case SSH_AUTH_FAIL_PUBKEY:
114	case SSH_AUTH_FAIL_HOSTBASED:
115	case SSH_AUTH_FAIL_GSSAPI:
116	case SSH_INVALID_USER:
117		linux_audit_record_event(-1, audit_username(), NULL,
118			get_remote_ipaddr(), "sshd", 0);
119		break;
120
121	default:
122		debug("%s: unhandled event %d", __func__, event);
123	}
124}
125
126#endif /* USE_LINUX_AUDIT */
127