// Copyright 2003-2016 The OpenSSL Project Authors. All Rights Reserved.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include <stdio.h>

#include <string.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/conf.h>

#include <openssl/err.h>

#include <openssl/obj.h>

#include <openssl/x509.h>

#include "internal.h"

using namespace bssl;

static STACK_OF(CONF_VALUE) *i2v_POLICY_CONSTRAINTS(

    const X509V3_EXT_METHOD *method, void *bcons,

    STACK_OF(CONF_VALUE) *extlist);

static void *v2i_POLICY_CONSTRAINTS(const X509V3_EXT_METHOD *method,

                                    const X509V3_CTX *ctx,

                                    const STACK_OF(CONF_VALUE) *values);

const X509V3_EXT_METHOD bssl::v3_policy_constraints = {

    NID_policy_constraints,

    0,

    ASN1_ITEM_ref(POLICY_CONSTRAINTS),

    nullptr,

    nullptr,

    nullptr,

    nullptr,

    nullptr,

    nullptr,

    i2v_POLICY_CONSTRAINTS,

    v2i_POLICY_CONSTRAINTS,

    nullptr,

    nullptr,

    nullptr};

ASN1_SEQUENCE(POLICY_CONSTRAINTS) = {

    ASN1_IMP_OPT(POLICY_CONSTRAINTS, requireExplicitPolicy, ASN1_INTEGER, 0),

    ASN1_IMP_OPT(POLICY_CONSTRAINTS, inhibitPolicyMapping, ASN1_INTEGER, 1),

} ASN1_SEQUENCE_END(POLICY_CONSTRAINTS)

IMPLEMENT_ASN1_ALLOC_FUNCTIONS(POLICY_CONSTRAINTS)

static STACK_OF(CONF_VALUE) *i2v_POLICY_CONSTRAINTS(

    const X509V3_EXT_METHOD *method, void *a, STACK_OF(CONF_VALUE) *extlist) {

  const POLICY_CONSTRAINTS *pcons = reinterpret_cast<POLICY_CONSTRAINTS *>(a);

  X509V3_add_value_int("Require Explicit Policy", pcons->requireExplicitPolicy,

                       &extlist);

  X509V3_add_value_int("Inhibit Policy Mapping", pcons->inhibitPolicyMapping,

                       &extlist);

  return extlist;

}

static void *v2i_POLICY_CONSTRAINTS(const X509V3_EXT_METHOD *method,

                                    const X509V3_CTX *ctx,

                                    const STACK_OF(CONF_VALUE) *values) {

  POLICY_CONSTRAINTS *pcons = nullptr;

  if (!(pcons = POLICY_CONSTRAINTS_new())) {

    return nullptr;

  }

  for (size_t i = 0; i < sk_CONF_VALUE_num(values); i++) {

    const CONF_VALUE *val = sk_CONF_VALUE_value(values, i);

    if (!strcmp(val->name, "requireExplicitPolicy")) {

      if (!X509V3_get_value_int(val, &pcons->requireExplicitPolicy)) {

        goto err;

      }

    } else if (!strcmp(val->name, "inhibitPolicyMapping")) {

      if (!X509V3_get_value_int(val, &pcons->inhibitPolicyMapping)) {

        goto err;

      }

    } else {

      OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_NAME);

      X509V3_conf_err(val);

      goto err;

    }

  }

  if (!pcons->inhibitPolicyMapping && !pcons->requireExplicitPolicy) {

    OPENSSL_PUT_ERROR(X509V3, X509V3_R_ILLEGAL_EMPTY_EXTENSION);

    goto err;

  }

  return pcons;

err:

  POLICY_CONSTRAINTS_free(pcons);

  return nullptr;

}