/*	$OpenBSD: cert.c,v 1.23 2002/08/07 13:19:20 ho Exp $	*/
/*	$EOM: cert.c,v 1.18 2000/09/28 12:53:27 niklas Exp $	*/

/*
 * Copyright (c) 1998, 1999 Niels Provos.  All rights reserved.
 * Copyright (c) 1999, 2000 Niklas Hallqvist.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Ericsson Radio Systems.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This code was written under funding by Ericsson Radio Systems.
 */

#include <sys/param.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "sysdep.h"

#include "isakmp_num.h"
#include "log.h"
#include "cert.h"

#ifdef USE_X509
#include "x509.h"
#endif

#ifdef USE_KEYNOTE
#include "policy.h"
#endif

struct cert_handler cert_handler[] = {
#ifdef USE_X509
  {
    ISAKMP_CERTENC_X509_SIG,
    x509_cert_init, x509_crl_init, x509_cert_get, x509_cert_validate,
    x509_cert_insert, x509_cert_free,
    x509_certreq_validate, x509_certreq_decode, x509_free_aca,
    x509_cert_obtain, x509_cert_get_key, x509_cert_get_subjects,
    x509_cert_dup, x509_serialize, x509_printable, x509_from_printable
  },
#endif
#ifdef USE_KEYNOTE
  {
    ISAKMP_CERTENC_KEYNOTE,
    keynote_cert_init, NULL, keynote_cert_get, keynote_cert_validate,
    keynote_cert_insert, keynote_cert_free,
    keynote_certreq_validate, keynote_certreq_decode, keynote_free_aca,
    keynote_cert_obtain, keynote_cert_get_key, keynote_cert_get_subjects,
    keynote_cert_dup, keynote_serialize, keynote_printable,
    keynote_from_printable
  },
#endif
};

/* Initialize all certificate handlers */

int
cert_init (void)
{
  int i, err = 1;

  for (i = 0; i < sizeof cert_handler / sizeof cert_handler[0]; i++)
    if (cert_handler[i].cert_init && !(*cert_handler[i].cert_init) ())
      err = 0;

  return err;
}

int
crl_init (void)
{
  int i, err = 1;

  for (i = 0; i < sizeof cert_handler / sizeof cert_handler[0]; i++)
    if (cert_handler[i].crl_init && !(*cert_handler[i].crl_init) ())
      err = 0;

  return err;
}

struct cert_handler *
cert_get (u_int16_t id)
{
  int i;

  for (i = 0; i < sizeof cert_handler / sizeof cert_handler[0]; i++)
    if (id == cert_handler[i].id)
      return &cert_handler[i];
  return 0;
}

/*
 * Decode the certificate request of type TYPE contained in DATA extending
 * DATALEN bytes.  Return a certreq_aca structure which the caller is
 * responsible for deallocating.
 */
struct certreq_aca *
certreq_decode (u_int16_t type, u_int8_t *data, u_int32_t datalen)
{
  struct cert_handler *handler;
  struct certreq_aca aca, *ret;

  handler = cert_get (type);
  if (!handler)
    return 0;

  aca.id = type;
  aca.handler = handler;

  if (datalen > 0)
    {
      aca.data = handler->certreq_decode (data, datalen);
      if (!aca.data)
	return 0;
    }
  else
    aca.data = 0;

  ret = malloc (sizeof aca);
  if (!ret)
    {
      log_error ("certreq_decode: malloc (%lu) failed",
		 (unsigned long)sizeof aca);
      handler->free_aca (aca.data);
      return 0;
    }

  memcpy (ret, &aca, sizeof aca);

  return ret;
}

void
cert_free_subjects (int n, u_int8_t **id, u_int32_t *len)
{
  int i;

  for (i = 0; i < n; i++)
    free (id[i]);
  free (id);
  free (len);
}