1 /* $OpenBSD: auth2-none.c,v 1.26 2024/05/17 00:30:23 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 <sys/types.h>
27 #include <stdarg.h>
28 #include <stdio.h>
29
30 #include "xmalloc.h"
31 #include "sshkey.h"
32 #include "hostfile.h"
33 #include "auth.h"
34 #include "packet.h"
35 #include "log.h"
36 #include "misc.h"
37 #include "servconf.h"
38 #include "ssh2.h"
39 #include "ssherr.h"
40 #ifdef GSSAPI
41 #include "ssh-gss.h"
42 #endif
43 #include "monitor_wrap.h"
44
45 /* import */
46 extern ServerOptions options;
47 extern struct authmethod_cfg methodcfg_none;
48
49 extern int none_enabled;
50
51 static int
userauth_none(struct ssh * ssh,const char * method)52 userauth_none(struct ssh *ssh, const char *method)
53 {
54 int r;
55
56 none_enabled = 0;
57 if ((r = sshpkt_get_end(ssh)) != 0)
58 fatal_fr(r, "parse packet");
59 if (options.permit_empty_passwd && options.password_authentication)
60 return mm_auth_password(ssh, "");
61 return (0);
62 }
63
64 Authmethod method_none = {
65 &methodcfg_none,
66 userauth_none,
67 };
68