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1 /* $OpenBSD: auth2-passwd.c,v 1.12 2014/07/15 15:54:14 millert 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 "xmalloc.h"
34 #include "packet.h"
35 #include "log.h"
36 #include "key.h"
37 #include "hostfile.h"
38 #include "auth.h"
39 #include "buffer.h"
40 #ifdef GSSAPI
41 #include "ssh-gss.h"
42 #endif
43 #include "monitor_wrap.h"
44 #include "misc.h"
45 #include "servconf.h"
46 
47 /* import */
48 extern ServerOptions options;
49 
50 static int
userauth_passwd(Authctxt * authctxt)51 userauth_passwd(Authctxt *authctxt)
52 {
53 	char *password, *newpass;
54 	int authenticated = 0;
55 	int change;
56 	u_int len, newlen;
57 
58 	change = packet_get_char();
59 	password = packet_get_string(&len);
60 	if (change) {
61 		/* discard new password from packet */
62 		newpass = packet_get_string(&newlen);
63 		explicit_bzero(newpass, newlen);
64 		free(newpass);
65 	}
66 	packet_check_eom();
67 
68 	if (change)
69 		logit("password change not supported");
70 #if !defined(ANDROID)
71 	/* no password authentication in Android */
72 	else if (PRIVSEP(auth_password(authctxt, password)) == 1)
73 		authenticated = 1;
74 #endif
75 	explicit_bzero(password, len);
76 	free(password);
77 	return authenticated;
78 }
79 
80 Authmethod method_passwd = {
81 	"password",
82 	userauth_passwd,
83 	&options.password_authentication
84 };
85