1/* $OpenBSD: auth2-none.c,v 1.16 2010/06/25 08:46:17 djm 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#include <sys/stat.h>
30#include <sys/uio.h>
31
32#include <fcntl.h>
33#include <stdarg.h>
34#include <string.h>
35#include <unistd.h>
36
37#include "atomicio.h"
38#include "xmalloc.h"
39#include "key.h"
40#include "hostfile.h"
41#include "auth.h"
42#include "packet.h"
43#include "log.h"
44#include "buffer.h"
45#include "servconf.h"
46#include "compat.h"
47#include "ssh2.h"
48#ifdef GSSAPI
49#include "ssh-gss.h"
50#endif
51#include "monitor_wrap.h"
52
53/* import */
54extern ServerOptions options;
55
56/* "none" is allowed only one time */
57static int none_enabled = 1;
58
59static int
60userauth_none(Authctxt *authctxt)
61{
62	none_enabled = 0;
63	packet_check_eom();
64	if (options.permit_empty_passwd && options.password_authentication)
65		return (PRIVSEP(auth_password(authctxt, "")));
66	return (0);
67}
68
69Authmethod method_none = {
70	"none",
71	userauth_none,
72	&none_enabled
73};
74