/* pcy_cache.c */

 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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;

 }

 EXPORT_C 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);

 	}

 EXPORT_C 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;

 	}

 EXPORT_C 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;

 	}