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    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
    9:  *
   10:  * This software is licensed as described in the file COPYING, which
   11:  * you should have received as part of this distribution. The terms
   12:  * are also available at https://curl.haxx.se/docs/copyright.html.
   13:  *
   14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   15:  * copies of the Software, and permit persons to whom the Software is
   16:  * furnished to do so, under the terms of the COPYING file.
   17:  *
   18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   19:  * KIND, either express or implied.
   20:  *
   21:  ***************************************************************************/
   22: /* <DESC>
   23:  * Uses the CURLINFO_TLS_SESSION data.
   24:  * </DESC>
   25:  */
   26: 
   27: /* Note that this example currently requires curl to be linked against
   28:    GnuTLS (and this program must also be linked against -lgnutls). */
   29: 
   30: #include <stdio.h>
   31: 
   32: #include <curl/curl.h>
   33: #include <gnutls/gnutls.h>
   34: #include <gnutls/x509.h>
   35: 
   36: static CURL *curl;
   37: 
   38: static size_t wrfu(void *ptr, size_t size, size_t nmemb, void *stream)
   39: {
   40:   const struct curl_tlssessioninfo *info;
   41:   unsigned int cert_list_size;
   42:   const gnutls_datum_t *chainp;
   43:   CURLcode res;
   44: 
   45:   (void)stream;
   46:   (void)ptr;
   47: 
   48:   res = curl_easy_getinfo(curl, CURLINFO_TLS_SESSION, &info);
   49: 
   50:   if(!res) {
   51:     switch(info->backend) {
   52:     case CURLSSLBACKEND_GNUTLS:
   53:       /* info->internals is now the gnutls_session_t */
   54:       chainp = gnutls_certificate_get_peers(info->internals, &cert_list_size);
   55:       if((chainp) && (cert_list_size)) {
   56:         unsigned int i;
   57: 
   58:         for(i = 0; i < cert_list_size; i++) {
   59:           gnutls_x509_crt_t cert;
   60:           gnutls_datum_t dn;
   61: 
   62:           if(GNUTLS_E_SUCCESS == gnutls_x509_crt_init(&cert)) {
   63:             if(GNUTLS_E_SUCCESS ==
   64:                gnutls_x509_crt_import(cert, &chainp[i], GNUTLS_X509_FMT_DER)) {
   65:               if(GNUTLS_E_SUCCESS ==
   66:                  gnutls_x509_crt_print(cert, GNUTLS_CRT_PRINT_FULL, &dn)) {
   67:                 fprintf(stderr, "Certificate #%u: %.*s", i, dn.size, dn.data);
   68: 
   69:                 gnutls_free(dn.data);
   70:               }
   71:             }
   72: 
   73:             gnutls_x509_crt_deinit(cert);
   74:           }
   75:         }
   76:       }
   77:       break;
   78:     case CURLSSLBACKEND_NONE:
   79:     default:
   80:       break;
   81:     }
   82:   }
   83: 
   84:   return size * nmemb;
   85: }
   86: 
   87: int main(void)
   88: {
   89:   curl_global_init(CURL_GLOBAL_DEFAULT);
   90: 
   91:   curl = curl_easy_init();
   92:   if(curl) {
   93:     curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
   94: 
   95:     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, wrfu);
   96: 
   97:     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
   98:     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
   99: 
  100:     curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
  101: 
  102:     (void) curl_easy_perform(curl);
  103: 
  104:     curl_easy_cleanup(curl);
  105:   }
  106: 
  107:   curl_global_cleanup();
  108: 
  109:   return 0;
  110: }