/* 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->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;

}