auth2-none.c revision 295367 
1/* $OpenBSD: auth2-none.c,v 1.18 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#include <sys/stat.h>
30#include <sys/uio.h>
31
32#include <fcntl.h>
33#include <string.h>
34#include <unistd.h>
35#include <stdarg.h>
36#include <stdio.h>
37
38#include "atomicio.h"
39#include "xmalloc.h"
40#include "key.h"
41#include "hostfile.h"
42#include "auth.h"
43#include "packet.h"
44#include "log.h"
45#include "buffer.h"
46#include "misc.h"
47#include "servconf.h"
48#include "compat.h"
49#include "ssh2.h"
50#ifdef GSSAPI
51#include "ssh-gss.h"
52#endif
53#include "monitor_wrap.h"
54
55/* import */
56extern ServerOptions options;
57
58/* "none" is allowed only one time */
59static int none_enabled = 1;
60
61static int
62userauth_none(Authctxt *authctxt)
63{
64	none_enabled = 0;
65	packet_check_eom();
66	if (options.permit_empty_passwd && options.password_authentication)
67		return (PRIVSEP(auth_password(authctxt, "")));
68	return (0);
69}
70
71Authmethod method_none = {
72	"none",
73	userauth_none,
74	&none_enabled
75};
76