/* 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;

	}