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pcy_cache.c

/* pcy_cache.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2004.
 */
/* ====================================================================
 * Copyright (c) 2004 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
 *    licensing@OpenSSL.org.
 *
 * 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
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include "cryptlib.h"
#include <openssl/x509.h>
#include <openssl/x509v3.h>

#include "pcy_int.h"

static int policy_data_cmp(const X509_POLICY_DATA * const *a,
                        const X509_POLICY_DATA * const *b);
static int policy_cache_set_int(long *out, ASN1_INTEGER *value);

/* Set cache entry according to CertificatePolicies extension.
 * Note: this destroys the passed CERTIFICATEPOLICIES structure.
 */

static int policy_cache_create(X509 *x,
                  CERTIFICATEPOLICIES *policies, int crit)
      {
      int i;
      int ret = 0;
      X509_POLICY_CACHE *cache = x->policy_cache;
      X509_POLICY_DATA *data = NULL;
      POLICYINFO *policy;
      if (sk_POLICYINFO_num(policies) == 0)
            goto bad_policy;
      cache->data = sk_X509_POLICY_DATA_new(policy_data_cmp);
      if (!cache->data)
            goto bad_policy;
      for (i = 0; i < sk_POLICYINFO_num(policies); i++)
            {
            policy = sk_POLICYINFO_value(policies, i);
            data = policy_data_new(policy, NULL, crit);
            if (!data)
                  goto bad_policy;
            /* Duplicate policy OIDs are illegal: reject if matches
             * found.
             */
            if (OBJ_obj2nid(data->valid_policy) == NID_any_policy)
                  {
                  if (cache->anyPolicy)
                        {
                        ret = -1;
                        goto bad_policy;
                        }
                  cache->anyPolicy = data;
                  }
            else if (sk_X509_POLICY_DATA_find(cache->data, data) != -1)
                  {
                  ret = -1;
                  goto bad_policy;
                  }
            else if (!sk_X509_POLICY_DATA_push(cache->data, data))
                  goto bad_policy;
            data = NULL;
            }
      ret = 1;
      bad_policy:
      if (ret == -1)
            x->ex_flags |= EXFLAG_INVALID_POLICY;
      if (data)
            policy_data_free(data);
      sk_POLICYINFO_pop_free(policies, POLICYINFO_free);
      if (ret <= 0)
            {
            sk_X509_POLICY_DATA_pop_free(cache->data, policy_data_free);
            cache->data = NULL;
            }
      return ret;
      }

      
static int policy_cache_new(X509 *x)
      {
      X509_POLICY_CACHE *cache;
      ASN1_INTEGER *ext_any = NULL;
      POLICY_CONSTRAINTS *ext_pcons = NULL;
      CERTIFICATEPOLICIES *ext_cpols = NULL;
      POLICY_MAPPINGS *ext_pmaps = NULL;
      int i;
      cache = OPENSSL_malloc(sizeof(X509_POLICY_CACHE));
      if (!cache)
            return 0;
      cache->anyPolicy = NULL;
      cache->data = NULL;
      cache->maps = NULL;
      cache->any_skip = -1;
      cache->explicit_skip = -1;
      cache->map_skip = -1;

      x->policy_cache = cache;

      /* Handle requireExplicitPolicy *first*. Need to process this
       * even if we don't have any policies.
       */
      ext_pcons = X509_get_ext_d2i(x, NID_policy_constraints, &i, NULL);

      if (!ext_pcons)
            {
            if (i != -1)
                  goto bad_cache;
            }
      else
            {
            if (!ext_pcons->requireExplicitPolicy
                  && !ext_pcons->inhibitPolicyMapping)
                  goto bad_cache;
            if (!policy_cache_set_int(&cache->explicit_skip,
                  ext_pcons->requireExplicitPolicy))
                  goto bad_cache;
            if (!policy_cache_set_int(&cache->map_skip,
                  ext_pcons->inhibitPolicyMapping))
                  goto bad_cache;
            }

      /* Process CertificatePolicies */

      ext_cpols = X509_get_ext_d2i(x, NID_certificate_policies, &i, NULL);
      /* If no CertificatePolicies extension or problem decoding then
       * there is no point continuing because the valid policies will be
       * NULL.
       */
      if (!ext_cpols)
            {
            /* If not absent some problem with extension */
            if (i != -1)
                  goto bad_cache;
            return 1;
            }

      i = policy_cache_create(x, ext_cpols, i);

      /* NB: ext_cpols freed by policy_cache_set_policies */

      if (i <= 0)
            return i;

      ext_pmaps = X509_get_ext_d2i(x, NID_policy_mappings, &i, NULL);

      if (!ext_pmaps)
            {
            /* If not absent some problem with extension */
            if (i != -1)
                  goto bad_cache;
            }
      else
            {
            i = policy_cache_set_mapping(x, ext_pmaps);
            if (i <= 0)
                  goto bad_cache;
            }

      ext_any = X509_get_ext_d2i(x, NID_inhibit_any_policy, &i, NULL);

      if (!ext_any)
            {
            if (i != -1)
                  goto bad_cache;
            }
      else if (!policy_cache_set_int(&cache->any_skip, ext_any))
                  goto bad_cache;

      if (0)
            {
            bad_cache:
            x->ex_flags |= EXFLAG_INVALID_POLICY;
            }

      if(ext_pcons)
            POLICY_CONSTRAINTS_free(ext_pcons);

      if (ext_any)
            ASN1_INTEGER_free(ext_any);

      return 1;

      
}

void policy_cache_free(X509_POLICY_CACHE *cache)
      {
      if (!cache)
            return;
      if (cache->anyPolicy)
            policy_data_free(cache->anyPolicy);
      if (cache->data)
            sk_X509_POLICY_DATA_pop_free(cache->data, policy_data_free);
      OPENSSL_free(cache);
      }

const X509_POLICY_CACHE *policy_cache_set(X509 *x)
      {

      if (x->policy_cache == NULL)
            {
            CRYPTO_w_lock(CRYPTO_LOCK_X509);
                  policy_cache_new(x);
            CRYPTO_w_unlock(CRYPTO_LOCK_X509);
            }

      return x->policy_cache;

      }

X509_POLICY_DATA *policy_cache_find_data(const X509_POLICY_CACHE *cache,
                                    const ASN1_OBJECT *id)
      {
      int idx;
      X509_POLICY_DATA tmp;
      tmp.valid_policy = (ASN1_OBJECT *)id;
      idx = sk_X509_POLICY_DATA_find(cache->data, &tmp);
      if (idx == -1)
            return NULL;
      return sk_X509_POLICY_DATA_value(cache->data, idx);
      }

static int policy_data_cmp(const X509_POLICY_DATA * const *a,
                        const X509_POLICY_DATA * const *b)
      {
      return OBJ_cmp((*a)->valid_policy, (*b)->valid_policy);
      }

static int policy_cache_set_int(long *out, ASN1_INTEGER *value)
      {
      if (value == NULL)
            return 1;
      if (value->type == V_ASN1_NEG_INTEGER)
            return 0;
      *out = ASN1_INTEGER_get(value);
      return 1;
      }

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