auth2-passwd.c

   1 /* $OpenBSD: auth2-passwd.c,v 1.9 2006/08/03 03:34:41 deraadt 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
  30 #include <string.h>
  31 #include <stdarg.h>
  32
  33 #include "xmalloc.h"
  34 #include "packet.h"
  35 #include "log.h"
  36 #include "key.h"
  37 #include "hostfile.h"
  38 #include "auth.h"
  39 #include "buffer.h"
  40 #ifdef GSSAPI
  41 #include "ssh-gss.h"
  42 #endif
  43 #include "monitor_wrap.h"
  44 #include "servconf.h"
  45
  46 /* import */
  47 extern ServerOptions options;
  48
  49 static int
  50 userauth_passwd(Authctxt *authctxt)
  51 {
  52         char *password, *newpass;
  53         int authenticated = 0;
  54         int change;
  55         u_int len, newlen;
  56
  57         change = packet_get_char();
  58         password = packet_get_string(&len);
  59         if (change) {
  60                 /* discard new password from packet */
  61                 newpass = packet_get_string(&newlen);
  62                 memset(newpass, 0, newlen);
  63                 xfree(newpass);
  64         }
  65         packet_check_eom();
  66
  67         if (change)
  68                 logit("password change not supported");
  69         else if (PRIVSEP(auth_password(authctxt, password)) == 1)
  70                 authenticated = 1;
  71         memset(password, 0, len);
  72         xfree(password);
  73         return authenticated;
  74 }
  75
  76 Authmethod method_passwd = {
  77         "password",
  78         userauth_passwd,
  79         &options.password_authentication
  80 };