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/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * SPDX-License-Identifier: curl
 *
 ***************************************************************************/
/* <DESC>
 * CA cert in memory with OpenSSL to get an HTTPS page.
 * </DESC>
 */

#include <openssl/err.h>
#include <openssl/ssl.h>
#include <curl/curl.h>
#include <stdio.h>

#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic ignored "-Woverlength-strings"
#endif

static size_t writefunction(void *ptr, size_t size, size_t nmemb, void *stream)
{
  fwrite(ptr, size, nmemb, (FILE *)stream);
  return nmemb * size;
}

static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
{
  CURLcode rv = CURLE_ABORTED_BY_CALLBACK;

  /** This example uses two (fake) certificates **/
  static const char mypem[] =
    "-----BEGIN CERTIFICATE-----\n"
    "MIIH0zCCBbugAwIBAgIIXsO3pkN/pOAwDQYJKoZIhvcNAQEFBQAwQjESMBAGA1UE\n"
    "AwwJQUNDVlJBSVoxMRAwDgYDVQQLDAdQS0lBQ0NWMQ0wCwYDVQQKDARBQ0NWMQsw\n"
    "CQYDVQQGEwJFUzAeFw0xMTA1MDUwOTM3MzdaFw0zMDEyMzEwOTM3MzdaMEIxEjAQ\n"
    "BgNVBAMMCUFDQ1ZSQUlaMTEQMA4GA1UECwwHUEtJQUNDVjENMAsGA1UECgwEQUND\n"
    "VjELMAkGA1UEBhMCRVMwggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQCb\n"
    "qau/YUqXry+XZpp0X9DZlv3P4uRm7x8fRzPCRKPfmt4ftVTdFXxpNRFvu8gMjmoY\n"
    "HtiP2Ra8EEg2XPBjs5BaXCQ316PWywlxufEBcoSwfdtNgM3802/J+Nq2DoLSRYWo\n"
    "G2ioPej0RGy9ocLLA76MPhMAhN9KSMDjIgro6TenGEyxCQ0jVn8ETdkXhBilyNpA\n"
    "0KIV9VMJcRz/RROE5iZe+OCIHAr8Fraocwa48GOEAqDGWuzndN9wrqODJerWx5eH\n"
    "k6fGioozl2A3ED6XPm4pFdahD9GILBKfb6qkxkLrQaLjlUPTAYVtjrs78yM2x/47\n"
    "JyCpZET/LtZ1qmxNYEAZSUNUY9rizLpm5U9EelvZaoErQNV/+QEnWCzI7UiRfD+m\n"
    "AM/EKXMRNt6GGT6d7hmKG9Ww7Y49nCrADdg9ZuM8Db3VlFzi4qc1GwQA9j9ajepD\n"
    "vV+JHanBsMyZ4k0ACtrJJ1vnE5Bc5PUzolVt3OAJTS+xJlsndQAJxGJ3KQhfnlms\n"
    "tn6tn1QwIgPBHnFk/vk4CpYY3QIUrCPLBhwepH2NDd4nQeit2hW3sCPdK6jT2iWH\n"
    "7ehVRE2I9DZ+hJp4rPcOVkkO1jMl1oRQQmwgEh0q1b688nCBpHBgvgW1m54ERL5h\n"
    "I6zppSSMEYCUWqKiuUnSwdzRp+0xESyeGabu4VXhwOrPDYTkF7eifKXeVSUG7szA\n"
    "h1xA2syVP1XgNce4hL60Xc16gwFy7ofmXx2utYXGJt/mwZrpHgJHnyqobalbz+xF\n"
    "d3+YJ5oyXSrjhO7FmGYvliAd3djDJ9ew+f7Zfc3Qn48LFFhRny+Lwzgt3uiP1o2H\n"
    "pPVWQxaZLPSkVrQ0uGE3ycJYgBugl6H8WY3pEfbRD0tVNEYqi4Y7\n"
    "-----END CERTIFICATE-----\n"
    "-----BEGIN CERTIFICATE-----\n"
    "MIIFtTCCA52gAwIBAgIIYY3HhjsBggUwDQYJKoZIhvcNAQEFBQAwRDEWMBQGA1UE\n"
    "AwwNQUNFRElDT00gUm9vdDEMMAoGA1UECwwDUEtJMQ8wDQYDVQQKDAZFRElDT00x\n"
    "CzAJBgNVBAYTAkVTMB4XDTA4MDQxODE2MjQyMloXDTI4MDQxMzE2MjQyMlowRDEW\n"
    "MBQGA1UEAwwNQUNFRElDT00gUm9vdDEMMAoGA1UECwwDUEtJMQ8wDQYDVQQKDAZF\n"
    "RElDT00xCzAJBgNVBAYTAkVTMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKC\n"
    "AgEA/5KV4WgGdrQsyFhIyv2AVClVYyT/kGWbEHV7w2rbYgIB8hiGtXxaOLHkWLn7\n"
    "09gtn70yN78sFW2+tfQh0hOR2QetAQXW8713zl9CgQr5auODAKgrLlUTY4HKRxx7\n"
    "XBZXehuDYAQ6PmXDzQHe3qTWDLqO3tkE7hdWIpuPY/1NFgu3e3eM+SW10W2ZEi5P\n"
    "gvoFNTPhNahXwOf9jU8/kzJPeGYDdwdY6ZXIfj7QeQCM8htRM5u8lOk6e25SLTKe\n"
    "I6RF+7YuE7CLGLHdztUdp0J/Vb77W7tH1PwkzQSulgUV1qzOMPPKC8W64iLgpq0i\n"
    "5ALudBF/TP94HTXa5gI06xgSYXcGCRZj6hitoocf8seACQl1ThCojz2GuHURwCRi\n"
    "ipZ7SkXp7FnFvmuD5uHorLUwHv4FB4D54SMNUI8FmP8sX+g7tq3PgbUhh8oIKiMn\n"
    "MCArz+2UW6yyetLHKKGKC5tNSixthT8Jcjxn4tncB7rrZXtaAWPWkFtPF2Y9fwsZ\n"
    "o5NjEFIqnxQWWOLcpfShFosOkYuByptZ+thrkQdlVV9SH686+5DdaaVbnG0OLLb6\n"
    "zqylfDJKZ0DcMDQj3dcEI2bw/FWAp/tmGYI1Z2JwOV5vx+qQQEQIHriy1tvuWacN\n"
    "GHk0vFQYXlPKNFHtRQrmjseCNj6nOGOpMCwXEGCSn1WHElkQwg9naRHMTh5+Spqt\n"
    "r0CodaxWkHS4oJyleW/c6RrIaQXpuvoDs3zk4E7Czp3otkYNbn5XOmeUwssfnHdK\n"
    "Z05phkOTOPu220+DkdRgfks+KzgHVZhepA==\n"
    "-----END CERTIFICATE-----\n";

  BIO *cbio = BIO_new_mem_buf(mypem, sizeof(mypem));
  X509_STORE  *cts = SSL_CTX_get_cert_store((SSL_CTX *)sslctx);
  int i;
  STACK_OF(X509_INFO) *inf;
  (void)curl;
  (void)parm;

  if(!cts || !cbio) {
    return rv;
  }

  inf = PEM_X509_INFO_read_bio(cbio, NULL, NULL, NULL);

  if(!inf) {
    BIO_free(cbio);
    return rv;
  }

  for(i = 0; i < sk_X509_INFO_num(inf); i++) {
    X509_INFO *itmp = sk_X509_INFO_value(inf, i);
    if(itmp->x509) {
      X509_STORE_add_cert(cts, itmp->x509);
    }
    if(itmp->crl) {
      X509_STORE_add_crl(cts, itmp->crl);
    }
  }

  sk_X509_INFO_pop_free(inf, X509_INFO_free);
  BIO_free(cbio);

  rv = CURLE_OK;
  return rv;
}

int main(void)
{
  CURL *ch;
  CURLcode rv;

  curl_global_init(CURL_GLOBAL_ALL);
  ch = curl_easy_init();
  curl_easy_setopt(ch, CURLOPT_VERBOSE, 0L);
  curl_easy_setopt(ch, CURLOPT_HEADER, 0L);
  curl_easy_setopt(ch, CURLOPT_NOPROGRESS, 1L);
  curl_easy_setopt(ch, CURLOPT_NOSIGNAL, 1L);
  curl_easy_setopt(ch, CURLOPT_WRITEFUNCTION, writefunction);
  curl_easy_setopt(ch, CURLOPT_WRITEDATA, stdout);
  curl_easy_setopt(ch, CURLOPT_HEADERFUNCTION, writefunction);
  curl_easy_setopt(ch, CURLOPT_HEADERDATA, stderr);
  curl_easy_setopt(ch, CURLOPT_SSLCERTTYPE, "PEM");
  curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 1L);
  curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");

  /* Turn off the default CA locations, otherwise libcurl loads CA
   * certificates from the locations that were detected/specified at
   * build-time
   */
  curl_easy_setopt(ch, CURLOPT_CAINFO, NULL);
  curl_easy_setopt(ch, CURLOPT_CAPATH, NULL);

  /* first try: retrieve page without ca certificates -> should fail
   * unless libcurl was built --with-ca-fallback enabled at build-time
   */
  rv = curl_easy_perform(ch);
  if(rv == CURLE_OK)
    printf("*** transfer succeeded ***\n");
  else
    printf("*** transfer failed ***\n");

  /* use a fresh connection (optional) this option seriously impacts
   * performance of multiple transfers but it is necessary order to
   * demonstrate this example. recall that the ssl ctx callback is only called
   * _before_ an SSL connection is established, therefore it does not affect
   * existing verified SSL connections already in the connection cache
   * associated with this handle. normally you would set the ssl ctx function
   * before making any transfers, and not use this option.
   */
  curl_easy_setopt(ch, CURLOPT_FRESH_CONNECT, 1L);

  /* second try: retrieve page using cacerts' certificate -> succeeds to load
   * the certificate by installing a function doing the necessary
   * "modifications" to the SSL CONTEXT just before link init
   */
  curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, sslctx_function);
  rv = curl_easy_perform(ch);
  if(rv == CURLE_OK)
    printf("*** transfer succeeded ***\n");
  else
    printf("*** transfer failed ***\n");

  curl_easy_cleanup(ch);
  curl_global_cleanup();
  return (int)rv;
}
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