/*

 * Copyright 2004-2021 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include "internal/cryptlib.h"

#include <openssl/x509.h>

#include <openssl/x509v3.h>

#include "crypto/x509.h"

#include "pcy_local.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, num, ret = 0;

    X509_POLICY_CACHE *cache = x->policy_cache;

    X509_POLICY_DATA *data = NULL;

    POLICYINFO *policy;

    if ((num = sk_POLICYINFO_num(policies)) <= 0)

        goto bad_policy;

    cache->data = sk_X509_POLICY_DATA_new(policy_data_cmp);

    if (cache->data == NULL) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

        goto just_cleanup;

    }

    for (i = 0; i < num; i++) {

        policy = sk_POLICYINFO_value(policies, i);

        data = ossl_policy_data_new(policy, NULL, crit);

        if (data == NULL) {

            ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

            goto just_cleanup;

        }

        /*

         * 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) >=0 ) {

            ret = -1;

            goto bad_policy;

        } else if (!sk_X509_POLICY_DATA_push(cache->data, data)) {

            ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

            goto bad_policy;

        }

        data = NULL;

    }

    ret = 1;

 bad_policy:

    if (ret == -1)

        x->ex_flags |= EXFLAG_INVALID_POLICY;

    ossl_policy_data_free(data);

 just_cleanup:

    sk_POLICYINFO_pop_free(policies, POLICYINFO_free);

    if (ret <= 0) {

        sk_X509_POLICY_DATA_pop_free(cache->data, ossl_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;

    if (x->policy_cache != NULL)

        return 1;

    cache = OPENSSL_malloc(sizeof(*cache));

    if (cache == NULL) {

        ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);

        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 = ossl_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;

    goto just_cleanup;

 bad_cache:

    x->ex_flags |= EXFLAG_INVALID_POLICY;

 just_cleanup:

    POLICY_CONSTRAINTS_free(ext_pcons);

    ASN1_INTEGER_free(ext_any);

    return 1;

}

void ossl_policy_cache_free(X509_POLICY_CACHE *cache)

{

    if (!cache)

        return;

    ossl_policy_data_free(cache->anyPolicy);

    sk_X509_POLICY_DATA_pop_free(cache->data, ossl_policy_data_free);

    OPENSSL_free(cache);

}

const X509_POLICY_CACHE *ossl_policy_cache_set(X509 *x)

{

    if (x->policy_cache == NULL) {

        if (!CRYPTO_THREAD_write_lock(x->lock))

            return NULL;

        policy_cache_new(x);

        CRYPTO_THREAD_unlock(x->lock);

    }

    return x->policy_cache;

}

X509_POLICY_DATA *ossl_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);

    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;

}