xref: /freebsd/crypto/openssh/auth2-none.c (revision 3e8eb5c7f4909209c042403ddee340b2ee7003a5)
1 /* $OpenBSD: auth2-none.c,v 1.24 2021/12/19 22:12:07 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 <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 "sshkey.h"
41 #include "hostfile.h"
42 #include "auth.h"
43 #include "packet.h"
44 #include "log.h"
45 #include "misc.h"
46 #include "servconf.h"
47 #include "compat.h"
48 #include "ssh2.h"
49 #include "ssherr.h"
50 #ifdef GSSAPI
51 #include "ssh-gss.h"
52 #endif
53 #include "monitor_wrap.h"
54 
55 /* import */
56 extern ServerOptions options;
57 
58 /* "none" is allowed only one time */
59 static int none_enabled = 1;
60 
61 static int
62 userauth_none(struct ssh *ssh, const char *method)
63 {
64 	int r;
65 
66 	none_enabled = 0;
67 	if ((r = sshpkt_get_end(ssh)) != 0)
68 		fatal_fr(r, "parse packet");
69 	if (options.permit_empty_passwd && options.password_authentication)
70 		return (PRIVSEP(auth_password(ssh, "")));
71 	return (0);
72 }
73 
74 Authmethod method_none = {
75 	"none",
76 	NULL,
77 	userauth_none,
78 	&none_enabled
79 };
80