1 /* $NetBSD: auth2-passwd.c,v 1.17 2024/07/08 22:33:43 christos Exp $ */
2 /* $OpenBSD: auth2-passwd.c,v 1.22 2024/05/17 00:30:23 djm Exp $ */
3
4 /*
5 * Copyright (c) 2000 Markus Friedl. All rights reserved.
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
28 #include "includes.h"
29 __RCSID("$NetBSD: auth2-passwd.c,v 1.17 2024/07/08 22:33:43 christos Exp $");
30 #include <sys/types.h>
31
32 #include <stdlib.h>
33 #include <string.h>
34 #include <stdarg.h>
35 #include <stdio.h>
36
37 #include "packet.h"
38 #include "ssherr.h"
39 #include "log.h"
40 #include "sshkey.h"
41 #include "hostfile.h"
42 #include "auth.h"
43 #ifdef GSSAPI
44 #include "ssh-gss.h"
45 #endif
46 #include "monitor_wrap.h"
47 #include "misc.h"
48 #include "servconf.h"
49
50 /* import */
51 extern ServerOptions options;
52 extern struct authmethod_cfg methodcfg_passwd;
53
54 static int
userauth_passwd(struct ssh * ssh,const char * method)55 userauth_passwd(struct ssh *ssh, const char *method)
56 {
57 char *password = NULL;
58 int authenticated = 0, r;
59 u_char change;
60 size_t len = 0;
61
62 if ((r = sshpkt_get_u8(ssh, &change)) != 0 ||
63 (r = sshpkt_get_cstring(ssh, &password, &len)) != 0 ||
64 (change && (r = sshpkt_get_cstring(ssh, NULL, NULL)) != 0) ||
65 (r = sshpkt_get_end(ssh)) != 0) {
66 freezero(password, len);
67 fatal_fr(r, "parse packet");
68 }
69
70 if (change)
71 logit("password change not supported");
72 else if (mm_auth_password(ssh, password) == 1)
73 authenticated = 1;
74 freezero(password, len);
75 return authenticated;
76 }
77
78 Authmethod method_passwd = {
79 &methodcfg_passwd,
80 userauth_passwd,
81 };
82