/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you 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

 *

 *   http://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.

 */

/***************************************************************************

 * Copyright (C) 2017-2026 ZmartZone Holding BV

 * All rights reserved.

 *

 * DISCLAIMER OF WARRANTIES:

 *

 * THE SOFTWARE PROVIDED HEREUNDER IS PROVIDED ON AN "AS IS" BASIS, WITHOUT

 * ANY WARRANTIES OR REPRESENTATIONS EXPRESS, IMPLIED OR STATUTORY; INCLUDING,

 * WITHOUT LIMITATION, WARRANTIES OF QUALITY, PERFORMANCE, NONINFRINGEMENT,

 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  NOR ARE THERE ANY

 * WARRANTIES CREATED BY A COURSE OR DEALING, COURSE OF PERFORMANCE OR TRADE

 * USAGE.  FURTHERMORE, THERE ARE NO WARRANTIES THAT THE SOFTWARE WILL MEET

 * YOUR NEEDS OR BE FREE FROM ERRORS, OR THAT THE OPERATION OF THE SOFTWARE

 * WILL BE UNINTERRUPTED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES 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.

 *

 * @Author: Hans Zandbelt - hans.zandbelt@openidc.com

 */

#include "proto/proto.h"

#include "cfg/dir.h"

#include "cfg/parse.h"

#include "metadata.h"

#include "metrics.h"

#include "util/util.h"

#include <openssl/opensslconf.h>

#include <openssl/opensslv.h>

/* nonce bytes length */

#define OIDC_PROTO_NONCE_LENGTH 32

/*

 * generate a random value (nonce) to correlate request/response through browser state

 */

apr_byte_t oidc_proto_nonce_gen(request_rec *r, char **nonce) {

  return oidc_util_rand_str(r, nonce, OIDC_PROTO_NONCE_LENGTH);

}

/* jti bytes length */

#define OIDC_PROTO_JWT_JTI_LEN 16

/*

 * generate a random unique "jti" JWT identifier

 */

char *oidc_proto_jti_gen(request_rec *r) {

  char *jti = NULL;

  if (oidc_util_rand_str(r, &jti, OIDC_PROTO_JWT_JTI_LEN) == FALSE) {

    oidc_error(r, "oidc_util_rand_str returned FALSE");

  }

  return jti;

}

/*

 * return the supported flows

 */

apr_array_header_t *oidc_proto_supported_flows(apr_pool_t *pool) {

  apr_array_header_t *result = apr_array_make(pool, 6, sizeof(const char *));

  APR_ARRAY_PUSH(result, const char *) = OIDC_PROTO_RESPONSE_TYPE_CODE;

  APR_ARRAY_PUSH(result, const char *) = OIDC_PROTO_RESPONSE_TYPE_IDTOKEN;

  APR_ARRAY_PUSH(result, const char *) = OIDC_PROTO_RESPONSE_TYPE_IDTOKEN_TOKEN;

  APR_ARRAY_PUSH(result, const char *) = OIDC_PROTO_RESPONSE_TYPE_CODE_IDTOKEN;

  APR_ARRAY_PUSH(result, const char *) = OIDC_PROTO_RESPONSE_TYPE_CODE_TOKEN;

  APR_ARRAY_PUSH(result, const char *) = OIDC_PROTO_RESPONSE_TYPE_CODE_IDTOKEN_TOKEN;

  return result;

}

/*

 * check if a particular OpenID Connect flow is supported

 */

apr_byte_t oidc_proto_flow_is_supported(apr_pool_t *pool, const char *flow) {

  apr_array_header_t *flows = oidc_proto_supported_flows(pool);

  for (int i = 0; i < flows->nelts; i++) {

    if (oidc_util_spaced_string_equals(pool, flow, APR_ARRAY_IDX(flows, i, const char *)))

      return TRUE;

  }

  return FALSE;

}

/*

 * set the WWW-Authenticate response header according to https://tools.ietf.org/html/rfc6750#section-3

 */

int oidc_proto_return_www_authenticate(request_rec *r, const char *error, const char *error_description) {

  apr_byte_t accept_token_in = (apr_byte_t)oidc_cfg_dir_oauth_accept_token_in_get(r);

  char *hdr;

  if (accept_token_in == OIDC_OAUTH_ACCEPT_TOKEN_IN_BASIC) {

    hdr = apr_psprintf(r->pool, "%s", OIDC_PROTO_BASIC);

  } else {

    hdr = apr_psprintf(r->pool, "%s", OIDC_PROTO_BEARER);

  }

  if (ap_auth_name(r) != NULL)

    hdr = apr_psprintf(r->pool, "%s %s=\"%s\"", hdr, OIDC_PROTO_REALM, ap_auth_name(r));

  if (error != NULL)

    hdr =

        apr_psprintf(r->pool, "%s%s %s=\"%s\"", hdr, (ap_auth_name(r) ? "," : ""), OIDC_PROTO_ERROR, error);

  if (error_description != NULL)

    hdr = apr_psprintf(r->pool, "%s, %s=\"%s\"", hdr, OIDC_PROTO_ERROR_DESCRIPTION, error_description);

  oidc_http_hdr_err_out_add(r, OIDC_HTTP_HDR_WWW_AUTHENTICATE, hdr);

  return HTTP_UNAUTHORIZED;

}