v3_asid.c

OpenSSL 0.9.8k 最新版OpenSSL

/*
 * Contributed to the OpenSSL Project by the American Registry for
 * Internet Numbers ("ARIN").
 */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  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 acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS CONTRIBUTORS 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 product includes cryptographic software written by Eric Young
 * ([e-mail]).  This product includes software written by Tim
 * Hudson ([e-mail]).
 */

/*
 * Implementation of RFC 3779 section 3.2.
 */

#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "cryptlib.h"
#include <openssl/conf.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/x509v3.h>
#include <openssl/x509.h>
#include <openssl/bn.h>

#ifndef OPENSSL_NO_RFC3779

/*
 * OpenSSL ASN.1 template translation of RFC 3779 3.2.3.
 */

ASN1_SEQUENCE(ASRange) = {
  ASN1_SIMPLE(ASRange, min, ASN1_INTEGER),
  ASN1_SIMPLE(ASRange, max, ASN1_INTEGER)
} ASN1_SEQUENCE_END(ASRange)

ASN1_CHOICE(ASIdOrRange) = {
  ASN1_SIMPLE(ASIdOrRange, u.id,    ASN1_INTEGER),
  ASN1_SIMPLE(ASIdOrRange, u.range, ASRange)
} ASN1_CHOICE_END(ASIdOrRange)

ASN1_CHOICE(ASIdentifierChoice) = {
  ASN1_SIMPLE(ASIdentifierChoice,      u.inherit,       ASN1_NULL),
  ASN1_SEQUENCE_OF(ASIdentifierChoice, u.asIdsOrRanges, ASIdOrRange)
} ASN1_CHOICE_END(ASIdentifierChoice)

ASN1_SEQUENCE(ASIdentifiers) = {
  ASN1_EXP_OPT(ASIdentifiers, asnum, ASIdentifierChoice, 0),
  ASN1_EXP_OPT(ASIdentifiers, rdi,   ASIdentifierChoice, 1)
} ASN1_SEQUENCE_END(ASIdentifiers)

IMPLEMENT_ASN1_FUNCTIONS(ASRange)
IMPLEMENT_ASN1_FUNCTIONS(ASIdOrRange)
IMPLEMENT_ASN1_FUNCTIONS(ASIdentifierChoice)
IMPLEMENT_ASN1_FUNCTIONS(ASIdentifiers)

/*
 * i2r method for an ASIdentifierChoice.
 */
static int i2r_ASIdentifierChoice(BIO *out,
				  ASIdentifierChoice *choice,
				  int indent,
				  const char *msg)
{
  int i;
  char *s;
  if (choice == NULL)
    return 1;
  BIO_printf(out, "%*s%s:\n", indent, "", msg);
  switch (choice->type) {
  case ASIdentifierChoice_inherit:
    BIO_printf(out, "%*sinherit\n", indent + 2, "");
    break;
  case ASIdentifierChoice_asIdsOrRanges:
    for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges); i++) {
      ASIdOrRange *aor = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
      switch (aor->type) {
      case ASIdOrRange_id:
	if ((s = i2s_ASN1_INTEGER(NULL, aor->u.id)) == NULL)
	  return 0;
	BIO_printf(out, "%*s%s\n", indent + 2, "", s);
	OPENSSL_free(s);
	break;
      case ASIdOrRange_range:
	if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->min)) == NULL)
	  return 0;
	BIO_printf(out, "%*s%s-", indent + 2, "", s);
	OPENSSL_free(s);
	if ((s = i2s_ASN1_INTEGER(NULL, aor->u.range->max)) == NULL)
	  return 0;
	BIO_printf(out, "%s\n", s);
	OPENSSL_free(s);
	break;
      default:
	return 0;
      }
    }
    break;
  default:
    return 0;
  }
  return 1;
}

/*
 * i2r method for an ASIdentifier extension.
 */
static int i2r_ASIdentifiers(X509V3_EXT_METHOD *method,
			     void *ext,
			     BIO *out,
			     int indent)
{
  ASIdentifiers *asid = ext;
  return (i2r_ASIdentifierChoice(out, asid->asnum, indent,
				 "Autonomous System Numbers") &&
	  i2r_ASIdentifierChoice(out, asid->rdi, indent,
				 "Routing Domain Identifiers"));
}

/*
 * Sort comparision function for a sequence of ASIdOrRange elements.
 */
static int ASIdOrRange_cmp(const ASIdOrRange * const *a_,
			   const ASIdOrRange * const *b_)
{
  const ASIdOrRange *a = *a_, *b = *b_;

  assert((a->type == ASIdOrRange_id && a->u.id != NULL) ||
	 (a->type == ASIdOrRange_range && a->u.range != NULL &&
	  a->u.range->min != NULL && a->u.range->max != NULL));

  assert((b->type == ASIdOrRange_id && b->u.id != NULL) ||
	 (b->type == ASIdOrRange_range && b->u.range != NULL &&
	  b->u.range->min != NULL && b->u.range->max != NULL));

  if (a->type == ASIdOrRange_id && b->type == ASIdOrRange_id)
    return ASN1_INTEGER_cmp(a->u.id, b->u.id);

  if (a->type == ASIdOrRange_range && b->type == ASIdOrRange_range) {
    int r = ASN1_INTEGER_cmp(a->u.range->min, b->u.range->min);
    return r != 0 ? r : ASN1_INTEGER_cmp(a->u.range->max, b->u.range->max);
  }

  if (a->type == ASIdOrRange_id)
    return ASN1_INTEGER_cmp(a->u.id, b->u.range->min);
  else
    return ASN1_INTEGER_cmp(a->u.range->min, b->u.id);
}

/*
 * Add an inherit element.
 */
int v3_asid_add_inherit(ASIdentifiers *asid, int which)
{
  ASIdentifierChoice **choice;
  if (asid == NULL)
    return 0;
  switch (which) {
  case V3_ASID_ASNUM:
    choice = &asid->asnum;
    break;
  case V3_ASID_RDI:
    choice = &asid->rdi;
    break;
  default:
    return 0;
  }
  if (*choice == NULL) {
    if ((*choice = ASIdentifierChoice_new()) == NULL)
      return 0;
    assert((*choice)->u.inherit == NULL);
    if (((*choice)->u.inherit = ASN1_NULL_new()) == NULL)
      return 0;
    (*choice)->type = ASIdentifierChoice_inherit;
  }
  return (*choice)->type == ASIdentifierChoice_inherit;
}

/*
 * Add an ID or range to an ASIdentifierChoice.
 */
int v3_asid_add_id_or_range(ASIdentifiers *asid,
			    int which,
			    ASN1_INTEGER *min,
			    ASN1_INTEGER *max)
{
  ASIdentifierChoice **choice;
  ASIdOrRange *aor;
  if (asid == NULL)
    return 0;
  switch (which) {
  case V3_ASID_ASNUM:
    choice = &asid->asnum;
    break;
  case V3_ASID_RDI:
    choice = &asid->rdi;
    break;
  default:
    return 0;
  }
  if (*choice != NULL && (*choice)->type == ASIdentifierChoice_inherit)
    return 0;
  if (*choice == NULL) {
    if ((*choice = ASIdentifierChoice_new()) == NULL)
      return 0;
    assert((*choice)->u.asIdsOrRanges == NULL);
    (*choice)->u.asIdsOrRanges = sk_ASIdOrRange_new(ASIdOrRange_cmp);
    if ((*choice)->u.asIdsOrRanges == NULL)
      return 0;
    (*choice)->type = ASIdentifierChoice_asIdsOrRanges;
  }
  if ((aor = ASIdOrRange_new()) == NULL)
    return 0;
  if (max == NULL) {
    aor->type = ASIdOrRange_id;
    aor->u.id = min;
  } else {
    aor->type = ASIdOrRange_range;
    if ((aor->u.range = ASRange_new()) == NULL)
      goto err;
    ASN1_INTEGER_free(aor->u.range->min);
    aor->u.range->min = min;
    ASN1_INTEGER_free(aor->u.range->max);
    aor->u.range->max = max;
  }
  if (!(sk_ASIdOrRange_push((*choice)->u.asIdsOrRanges, aor)))
    goto err;
  return 1;

 err:
  ASIdOrRange_free(aor);
  return 0;
}

/*
 * Extract min and max values from an ASIdOrRange.
 */
static void extract_min_max(ASIdOrRange *aor,
			    ASN1_INTEGER **min,
			    ASN1_INTEGER **max)
{
  assert(aor != NULL && min != NULL && max != NULL);
  switch (aor->type) {
  case ASIdOrRange_id:
    *min = aor->u.id;
    *max = aor->u.id;
    return;
  case ASIdOrRange_range:
    *min = aor->u.range->min;
    *max = aor->u.range->max;
    return;
  }
}

/*
 * Check whether an ASIdentifierChoice is in canonical form.
 */
static int ASIdentifierChoice_is_canonical(ASIdentifierChoice *choice)
{
  ASN1_INTEGER *a_max_plus_one = NULL;
  BIGNUM *bn = NULL;
  int i, ret = 0;

  /*
   * Empty element or inheritance is canonical.
   */
  if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
    return 1;

  /*
   * If not a list, or if empty list, it's broken.
   */
  if (choice->type != ASIdentifierChoice_asIdsOrRanges ||
      sk_ASIdOrRange_num(choice->u.asIdsOrRanges) == 0)
    return 0;

  /*
   * It's a list, check it.
   */
  for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
    ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
    ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
    ASN1_INTEGER *a_min, *a_max, *b_min, *b_max;

    extract_min_max(a, &a_min, &a_max);
    extract_min_max(b, &b_min, &b_max);

    /*
     * Punt misordered list, overlapping start, or inverted range.
     */
    if (ASN1_INTEGER_cmp(a_min, b_min) >= 0 ||
	ASN1_INTEGER_cmp(a_min, a_max) > 0 ||
	ASN1_INTEGER_cmp(b_min, b_max) > 0)
      goto done;

    /*
     * Calculate a_max + 1 to check for adjacency.
     */
    if ((bn == NULL && (bn = BN_new()) == NULL) ||
	ASN1_INTEGER_to_BN(a_max, bn) == NULL ||
	!BN_add_word(bn, 1) ||
	(a_max_plus_one = BN_to_ASN1_INTEGER(bn, a_max_plus_one)) == NULL) {
      X509V3err(X509V3_F_ASIDENTIFIERCHOICE_IS_CANONICAL,
		ERR_R_MALLOC_FAILURE);
      goto done;
    }
    
    /*
     * Punt if adjacent or overlapping.
     */
    if (ASN1_INTEGER_cmp(a_max_plus_one, b_min) >= 0)
      goto done;
  }

  ret = 1;

 done:
  ASN1_INTEGER_free(a_max_plus_one);
  BN_free(bn);
  return ret;
}

/*
 * Check whether an ASIdentifier extension is in canonical form.
 */
int v3_asid_is_canonical(ASIdentifiers *asid)
{
  return (asid == NULL ||
	  (ASIdentifierChoice_is_canonical(asid->asnum) ||
	   ASIdentifierChoice_is_canonical(asid->rdi)));
}

/*
 * Whack an ASIdentifierChoice into canonical form.
 */
static int ASIdentifierChoice_canonize(ASIdentifierChoice *choice)
{
  ASN1_INTEGER *a_max_plus_one = NULL;
  BIGNUM *bn = NULL;
  int i, ret = 0;

  /*
   * Nothing to do for empty element or inheritance.
   */
  if (choice == NULL || choice->type == ASIdentifierChoice_inherit)
    return 1;

  /*
   * We have a list.  Sort it.
   */
  assert(choice->type == ASIdentifierChoice_asIdsOrRanges);
  sk_ASIdOrRange_sort(choice->u.asIdsOrRanges);

  /*
   * Now check for errors and suboptimal encoding, rejecting the
   * former and fixing the latter.
   */
  for (i = 0; i < sk_ASIdOrRange_num(choice->u.asIdsOrRanges) - 1; i++) {
    ASIdOrRange *a = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i);
    ASIdOrRange *b = sk_ASIdOrRange_value(choice->u.asIdsOrRanges, i + 1);
    ASN1_INTEGER *a_min, *a_max, *b_min, *b_max;

    extract_min_max(a, &a_min, &a_max);
    extract_min_max(b, &b_min, &b_max);

    /*
     * Make sure we're properly sorted (paranoia).
     */
    assert(ASN1_INTEGER_cmp(a_min, b_min) <= 0);

    /*
     * Check for overlaps.
     */
    if (ASN1_INTEGER_cmp(a_max, b_min) >= 0) {
      X509V3err(X509V3_F_ASIDENTIFIERCHOICE_CANONIZE,