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      1 /*	$NetBSD: auth2-none.c,v 1.15 2024/07/08 22:33:43 christos Exp $	*/
      2 /* $OpenBSD: auth2-none.c,v 1.26 2024/05/17 00:30:23 djm Exp $ */
      3 
      4 /*
      5  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "includes.h"
     29 __RCSID("$NetBSD: auth2-none.c,v 1.15 2024/07/08 22:33:43 christos Exp $");
     30 #include <sys/types.h>
     31 #include <stdarg.h>
     32 #include <stdio.h>
     33 
     34 #include "xmalloc.h"
     35 #include "sshkey.h"
     36 #include "hostfile.h"
     37 #include "auth.h"
     38 #include "packet.h"
     39 #include "log.h"
     40 #include "misc.h"
     41 #include "servconf.h"
     42 #include "ssh2.h"
     43 #include "ssherr.h"
     44 #ifdef GSSAPI
     45 #include "ssh-gss.h"
     46 #endif
     47 #include "monitor_wrap.h"
     48 
     49 /* import */
     50 extern ServerOptions options;
     51 extern struct authmethod_cfg methodcfg_none;
     52 
     53 extern int none_enabled;
     54 
     55 static int
     56 userauth_none(struct ssh *ssh, const char *method)
     57 {
     58 	int r;
     59 
     60 	none_enabled = 0;
     61 	if ((r = sshpkt_get_end(ssh)) != 0)
     62 		fatal_fr(r, "parse packet");
     63 	if (options.permit_empty_passwd && options.password_authentication)
     64 		return mm_auth_password(ssh, "");
     65 	return (0);
     66 }
     67 
     68 Authmethod method_none = {
     69 	&methodcfg_none,
     70 	userauth_none,
     71 };
     72