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      1 /***************************************************************************
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      3  *  Project                     ___| | | |  _ \| |
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      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel (at) 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 http://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 #include <stdio.h>
     23 
     24 #include <curl/curl.h>
     25 
     26 /* some requirements for this to work:
     27    1.   set pCertFile to the file with the client certificate
     28    2.   if the key is passphrase protected, set pPassphrase to the
     29         passphrase you use
     30    3.   if you are using a crypto engine:
     31    3.1. set a #define USE_ENGINE
     32    3.2. set pEngine to the name of the crypto engine you use
     33    3.3. set pKeyName to the key identifier you want to use
     34    4.   if you don't use a crypto engine:
     35    4.1. set pKeyName to the file name of your client key
     36    4.2. if the format of the key file is DER, set pKeyType to "DER"
     37 
     38    !! verify of the server certificate is not implemented here !!
     39 
     40    **** This example only works with libcurl 7.9.3 and later! ****
     41 
     42 */
     43 
     44 int main(void)
     45 {
     46   int i;
     47   CURL *curl;
     48   CURLcode res;
     49   FILE *headerfile;
     50   const char *pPassphrase = NULL;
     51 
     52   static const char *pCertFile = "testcert.pem";
     53   static const char *pCACertFile="cacert.pem";
     54 
     55   const char *pKeyName;
     56   const char *pKeyType;
     57 
     58   const char *pEngine;
     59 
     60 #ifdef USE_ENGINE
     61   pKeyName  = "rsa_test";
     62   pKeyType  = "ENG";
     63   pEngine   = "chil";            /* for nChiper HSM... */
     64 #else
     65   pKeyName  = "testkey.pem";
     66   pKeyType  = "PEM";
     67   pEngine   = NULL;
     68 #endif
     69 
     70   headerfile = fopen("dumpit", "w");
     71 
     72   curl_global_init(CURL_GLOBAL_DEFAULT);
     73 
     74   curl = curl_easy_init();
     75   if(curl) {
     76     /* what call to write: */
     77     curl_easy_setopt(curl, CURLOPT_URL, "HTTPS://your.favourite.ssl.site");
     78     curl_easy_setopt(curl, CURLOPT_HEADERDATA, headerfile);
     79 
     80     for(i = 0; i < 1; i++) /* single-iteration loop, just to break out from */
     81     {
     82       if (pEngine)             /* use crypto engine */
     83       {
     84         if (curl_easy_setopt(curl, CURLOPT_SSLENGINE,pEngine) != CURLE_OK)
     85         {                     /* load the crypto engine */
     86           fprintf(stderr,"can't set crypto engine\n");
     87           break;
     88         }
     89         if (curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT,1L) != CURLE_OK)
     90         { /* set the crypto engine as default */
     91           /* only needed for the first time you load
     92              a engine in a curl object... */
     93           fprintf(stderr,"can't set crypto engine as default\n");
     94           break;
     95         }
     96       }
     97       /* cert is stored PEM coded in file... */
     98       /* since PEM is default, we needn't set it for PEM */
     99       curl_easy_setopt(curl,CURLOPT_SSLCERTTYPE,"PEM");
    100 
    101       /* set the cert for client authentication */
    102       curl_easy_setopt(curl,CURLOPT_SSLCERT,pCertFile);
    103 
    104       /* sorry, for engine we must set the passphrase
    105          (if the key has one...) */
    106       if (pPassphrase)
    107         curl_easy_setopt(curl,CURLOPT_KEYPASSWD,pPassphrase);
    108 
    109       /* if we use a key stored in a crypto engine,
    110          we must set the key type to "ENG" */
    111       curl_easy_setopt(curl,CURLOPT_SSLKEYTYPE,pKeyType);
    112 
    113       /* set the private key (file or ID in engine) */
    114       curl_easy_setopt(curl,CURLOPT_SSLKEY,pKeyName);
    115 
    116       /* set the file with the certs vaildating the server */
    117       curl_easy_setopt(curl,CURLOPT_CAINFO,pCACertFile);
    118 
    119       /* disconnect if we can't validate server's cert */
    120       curl_easy_setopt(curl,CURLOPT_SSL_VERIFYPEER,1L);
    121 
    122       /* Perform the request, res will get the return code */
    123       res = curl_easy_perform(curl);
    124       /* Check for errors */
    125       if(res != CURLE_OK)
    126         fprintf(stderr, "curl_easy_perform() failed: %s\n",
    127                 curl_easy_strerror(res));
    128 
    129       /* we are done... */
    130     }
    131     /* always cleanup */
    132     curl_easy_cleanup(curl);
    133   }
    134 
    135   curl_global_cleanup();
    136 
    137   return 0;
    138 }
    139