1 /*
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"
37 #include "packet.h"
38
39 const char *audit_username(void);
40
41 int
linux_audit_record_event(int uid,const char * username,const char * hostname,const char * ip,const char * ttyn,int success)42 linux_audit_record_event(int uid, const char *username, const char *hostname,
43 const char *ip, const char *ttyn, int success)
44 {
45 int audit_fd, rc, saved_errno;
46
47 if ((audit_fd = audit_open()) < 0) {
48 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);
59
60 /*
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;
67
68 return rc >= 0;
69 }
70
71 /* Below is the sshd audit API code */
72
73 void
audit_connection_from(const char * host,int port)74 audit_connection_from(const char *host, int port)
75 {
76 /* not implemented */
77 }
78
79 void
audit_run_command(const char * command)80 audit_run_command(const char *command)
81 {
82 /* not implemented */
83 }
84
85 void
audit_session_open(struct logininfo * li)86 audit_session_open(struct logininfo *li)
87 {
88 if (linux_audit_record_event(li->uid, NULL, li->hostname, NULL,
89 li->line, 1) == 0)
90 fatal("linux_audit_write_entry failed: %s", strerror(errno));
91 }
92
93 void
audit_session_close(struct logininfo * li)94 audit_session_close(struct logininfo *li)
95 {
96 /* not implemented */
97 }
98
99 void
audit_event(struct ssh * ssh,ssh_audit_event_t event)100 audit_event(struct ssh *ssh, 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 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,
117 ssh_remote_ipaddr(ssh), "sshd", 0);
118 break;
119 default:
120 debug("%s: unhandled event %d", __func__, event);
121 break;
122 }
123 }
124 #endif /* USE_LINUX_AUDIT */
125