crypto/external/bsd/openssh/dist/auth2-krb5.c

   1 /*      $NetBSD: auth2-krb5.c,v 1.14 2009/02/16 20:55:22 christos Exp $ */
   2 /*
   3  * Copyright (c) 2003 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 __RCSID("$NetBSD: auth2-krb5.c,v 1.14 2009/02/16 20:55:22 christos Exp $");
  28
  29 #include <krb5.h>
  30 #include <stdio.h>
  31
  32 #include "ssh2.h"
  33 #include "xmalloc.h"
  34 #include "packet.h"
  35 #include "log.h"
  36 #include "key.h"
  37 #include "buffer.h"
  38 #include "hostfile.h"
  39 #include "auth.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_kerberos(Authctxt *authctxt)
  51 {
  52         krb5_data tkt, reply;
  53         u_int dlen;
  54         char *client = NULL;
  55         int authenticated = 0;
  56
  57         tkt.data = packet_get_string(&dlen);
  58         tkt.length = dlen;
  59         packet_check_eom();
  60
  61         if (PRIVSEP(auth_krb5(authctxt, &tkt, &client, &reply))) {
  62                 authenticated = 1;
  63                 if (reply.length)
  64                         xfree(reply.data);
  65         }
  66         if (client)
  67                 xfree(client);
  68         xfree(tkt.data);
  69         return (authenticated);
  70 }
  71
  72 Authmethod method_kerberos = {
  73         "kerberos-2@ssh.com",
  74         userauth_kerberos,
  75         &options.kerberos_authentication
  76 };