text: /* 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 = (X509_POLICY_CACHE*)OPENSSL_malloc(sizeof(X509_POLICY_CACHE));
  	if (!cache)
  		return 0;
  	cache->anyPolicy = NULL;
  	cache->data = 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 = (POLICY_CONSTRAINTS*)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 = (CERTIFICATEPOLICIES*)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 = (POLICY_MAPPINGS*)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 = (ASN1_INTEGER*)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;
  	}
  