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Darren Tuckerea52a822011-01-17 21:15:27 +11001/*
2 * Copyright 2010 Red Hat, Inc. All rights reserved.
3 * Use is subject to license terms.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * Red Hat author: Jan F. Chadima <jchadima@redhat.com>
26 */
27
28#include "includes.h"
29#if defined(USE_LINUX_AUDIT)
30#include <libaudit.h>
31#include <unistd.h>
32#include <string.h>
33
34#include "log.h"
35#include "audit.h"
36#include "canohost.h"
Damien Millerd99ee9c2016-07-27 08:25:23 +100037#include "packet.h"
Darren Tuckerea52a822011-01-17 21:15:27 +110038
Damien Miller3e1e0762016-07-27 08:25:42 +100039const char *audit_username(void);
Darren Tuckerea52a822011-01-17 21:15:27 +110040
41int
Damien Miller3e1e0762016-07-27 08:25:42 +100042linux_audit_record_event(int uid, const char *username, const char *hostname,
43 const char *ip, const char *ttyn, int success)
Darren Tuckerea52a822011-01-17 21:15:27 +110044{
45 int audit_fd, rc, saved_errno;
46
Damien Miller3e1e0762016-07-27 08:25:42 +100047 if ((audit_fd = audit_open()) < 0) {
Darren Tuckerea52a822011-01-17 21:15:27 +110048 if (errno == EINVAL || errno == EPROTONOSUPPORT ||
49 errno == EAFNOSUPPORT)
50 return 1; /* No audit support in kernel */
51 else
52 return 0; /* Must prevent login */
53 }
54 rc = audit_log_acct_message(audit_fd, AUDIT_USER_LOGIN,
55 NULL, "login", username ? username : "(unknown)",
56 username == NULL ? uid : -1, hostname, ip, ttyn, success);
57 saved_errno = errno;
58 close(audit_fd);
Damien Miller3e1e0762016-07-27 08:25:42 +100059
Darren Tuckerea52a822011-01-17 21:15:27 +110060 /*
61 * Do not report error if the error is EPERM and sshd is run as non
62 * root user.
63 */
64 if ((rc == -EPERM) && (geteuid() != 0))
65 rc = 0;
66 errno = saved_errno;
Damien Miller3e1e0762016-07-27 08:25:42 +100067
68 return rc >= 0;
Darren Tuckerea52a822011-01-17 21:15:27 +110069}
70
71/* Below is the sshd audit API code */
72
73void
74audit_connection_from(const char *host, int port)
75{
Darren Tuckerea52a822011-01-17 21:15:27 +110076 /* not implemented */
Damien Miller3e1e0762016-07-27 08:25:42 +100077}
Darren Tuckerea52a822011-01-17 21:15:27 +110078
79void
80audit_run_command(const char *command)
81{
82 /* not implemented */
83}
84
85void
86audit_session_open(struct logininfo *li)
87{
Damien Miller3e1e0762016-07-27 08:25:42 +100088 if (linux_audit_record_event(li->uid, NULL, li->hostname, NULL,
89 li->line, 1) == 0)
Darren Tuckerea52a822011-01-17 21:15:27 +110090 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
Damien Miller9b655dc2019-01-20 14:55:27 +1100100audit_event(struct ssh *ssh, ssh_audit_event_t event)
Darren Tuckerea52a822011-01-17 21:15:27 +1100101{
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;
Darren Tuckerea52a822011-01-17 21:15:27 +1100109 case SSH_AUTH_FAIL_NONE:
110 case SSH_AUTH_FAIL_PASSWD:
111 case SSH_AUTH_FAIL_KBDINT:
112 case SSH_AUTH_FAIL_PUBKEY:
113 case SSH_AUTH_FAIL_HOSTBASED:
114 case SSH_AUTH_FAIL_GSSAPI:
115 case SSH_INVALID_USER:
116 linux_audit_record_event(-1, audit_username(), NULL,
Damien Miller393bd382016-07-27 08:18:05 +1000117 ssh_remote_ipaddr(ssh), "sshd", 0);
Darren Tuckerea52a822011-01-17 21:15:27 +1100118 break;
Darren Tuckerea52a822011-01-17 21:15:27 +1100119 default:
120 debug("%s: unhandled event %d", __func__, event);
Damien Miller3e1e0762016-07-27 08:25:42 +1000121 break;
Darren Tuckerea52a822011-01-17 21:15:27 +1100122 }
123}
Darren Tuckerea52a822011-01-17 21:15:27 +1100124#endif /* USE_LINUX_AUDIT */