xref: /openssh-portable/auth2-passwd.c (revision c7d39ac8)
1 /* $OpenBSD: auth2-passwd.c,v 1.16 2018/07/09 21:35:50 markus 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 <string.h>
31 #include <stdarg.h>
32 
33 #include "packet.h"
34 #include "ssherr.h"
35 #include "log.h"
36 #include "sshkey.h"
37 #include "hostfile.h"
38 #include "auth.h"
39 #ifdef GSSAPI
40 #include "ssh-gss.h"
41 #endif
42 #include "monitor_wrap.h"
43 #include "misc.h"
44 #include "servconf.h"
45 
46 /* import */
47 extern ServerOptions options;
48 
49 static int
userauth_passwd(struct ssh * ssh)50 userauth_passwd(struct ssh *ssh)
51 {
52 	char *password;
53 	int authenticated = 0, r;
54 	u_char change;
55 	size_t len;
56 
57 	if ((r = sshpkt_get_u8(ssh, &change)) != 0 ||
58 	    (r = sshpkt_get_cstring(ssh, &password, &len)) != 0 ||
59 	    (change && (r = sshpkt_get_cstring(ssh, NULL, NULL)) != 0) ||
60 	    (r = sshpkt_get_end(ssh)) != 0)
61 		fatal("%s: %s", __func__, ssh_err(r));
62 
63 	if (change)
64 		logit("password change not supported");
65 	else if (PRIVSEP(auth_password(ssh, password)) == 1)
66 		authenticated = 1;
67 	explicit_bzero(password, len);
68 	free(password);
69 	return authenticated;
70 }
71 
72 Authmethod method_passwd = {
73 	"password",
74 	userauth_passwd,
75 	&options.password_authentication
76 };
77