1 /* $OpenBSD: auth2-passwd.c,v 1.21 2022/05/27 04:29:40 dtucker Exp $ */
2 /*
3 * Copyright (c) 2000 Markus Friedl. All rights reserved.
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
26 #include "includes.h"
27
28 #include <sys/types.h>
29
30 #include <stdlib.h>
31 #include <string.h>
32 #include <stdarg.h>
33 #include <stdio.h>
34
35 #include "packet.h"
36 #include "ssherr.h"
37 #include "log.h"
38 #include "sshkey.h"
39 #include "hostfile.h"
40 #include "auth.h"
41 #ifdef GSSAPI
42 #include "ssh-gss.h"
43 #endif
44 #include "monitor_wrap.h"
45 #include "misc.h"
46 #include "servconf.h"
47
48 /* import */
49 extern ServerOptions options;
50
51 static int
userauth_passwd(struct ssh * ssh,const char * method)52 userauth_passwd(struct ssh *ssh, const char *method)
53 {
54 char *password = NULL;
55 int authenticated = 0, r;
56 u_char change;
57 size_t len = 0;
58
59 if ((r = sshpkt_get_u8(ssh, &change)) != 0 ||
60 (r = sshpkt_get_cstring(ssh, &password, &len)) != 0 ||
61 (change && (r = sshpkt_get_cstring(ssh, NULL, NULL)) != 0) ||
62 (r = sshpkt_get_end(ssh)) != 0) {
63 freezero(password, len);
64 fatal_fr(r, "parse packet");
65 }
66
67 if (change)
68 logit("password change not supported");
69 else if (PRIVSEP(auth_password(ssh, password)) == 1)
70 authenticated = 1;
71 freezero(password, len);
72 return authenticated;
73 }
74
75 Authmethod method_passwd = {
76 "password",
77 NULL,
78 userauth_passwd,
79 &options.password_authentication
80 };
81