crypto/openssh/auth2-none.c

   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 };