docs/examples/cacertinmem.c

   1 /*****************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  *
   9  * Example using a "in core" PEM certificate to retrieve a https page.
  10  * Written by Theo Borm
  11  */
  12
  13 /* on a netBSD system with OPENSSL& LIBCURL installed from
  14  * pkgsrc (using default paths) this program can be compiled using:
  15  * gcc -I/usr/pkg/include -L/usr/pkg/lib -lcurl -Wl,-R/usr/pkg/lib -lssl
  16  * -lcrypto -lz -o curlcacerttest curlcacerttest.c
  17  * on other operating systems you may want to change paths to headers
  18  * and libraries
  19 */
  20 #include <openssl/ssl.h>
  21 #include <curl/curl.h>
  22 #include <stdio.h>
  23
  24 size_t writefunction( void *ptr, size_t size, size_t nmemb, void *stream)
  25 {
  26   fwrite(ptr,size,nmemb,stream);
  27   return(nmemb*size);
  28 }
  29
  30 static CURLcode sslctx_function(CURL * curl, void * sslctx, void * parm)
  31 {
  32   X509_STORE * store;
  33   X509 * cert=NULL;
  34   BIO * bio;
  35   char * mypem = /* www.cacert.org */
  36     "-----BEGIN CERTIFICATE-----\n"\
  37     "MIIHPTCCBSWgAwIBAgIBADANBgkqhkiG9w0BAQQFADB5MRAwDgYDVQQKEwdSb290\n"\
  38     "IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNB\n"\
  39     "IENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRA\n"\
  40     "Y2FjZXJ0Lm9yZzAeFw0wMzAzMzAxMjI5NDlaFw0zMzAzMjkxMjI5NDlaMHkxEDAO\n"\
  41     "BgNVBAoTB1Jvb3QgQ0ExHjAcBgNVBAsTFWh0dHA6Ly93d3cuY2FjZXJ0Lm9yZzEi\n"\
  42     "MCAGA1UEAxMZQ0EgQ2VydCBTaWduaW5nIEF1dGhvcml0eTEhMB8GCSqGSIb3DQEJ\n"\
  43     "ARYSc3VwcG9ydEBjYWNlcnQub3JnMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIIC\n"\
  44     "CgKCAgEAziLA4kZ97DYoB1CW8qAzQIxL8TtmPzHlawI229Z89vGIj053NgVBlfkJ\n"\
  45     "8BLPRoZzYLdufujAWGSuzbCtRRcMY/pnCujW0r8+55jE8Ez64AO7NV1sId6eINm6\n"\
  46     "zWYyN3L69wj1x81YyY7nDl7qPv4coRQKFWyGhFtkZip6qUtTefWIonvuLwphK42y\n"\
  47     "fk1WpRPs6tqSnqxEQR5YYGUFZvjARL3LlPdCfgv3ZWiYUQXw8wWRBB0bF4LsyFe7\n"\
  48     "w2t6iPGwcswlWyCR7BYCEo8y6RcYSNDHBS4CMEK4JZwFaz+qOqfrU0j36NK2B5jc\n"\
  49     "G8Y0f3/JHIJ6BVgrCFvzOKKrF11myZjXnhCLotLddJr3cQxyYN/Nb5gznZY0dj4k\n"\
  50     "epKwDpUeb+agRThHqtdB7Uq3EvbXG4OKDy7YCbZZ16oE/9KTfWgu3YtLq1i6L43q\n"\
  51     "laegw1SJpfvbi1EinbLDvhG+LJGGi5Z4rSDTii8aP8bQUWWHIbEZAWV/RRyH9XzQ\n"\
  52     "QUxPKZgh/TMfdQwEUfoZd9vUFBzugcMd9Zi3aQaRIt0AUMyBMawSB3s42mhb5ivU\n"\
  53     "fslfrejrckzzAeVLIL+aplfKkQABi6F1ITe1Yw1nPkZPcCBnzsXWWdsC4PDSy826\n"\
  54     "YreQQejdIOQpvGQpQsgi3Hia/0PsmBsJUUtaWsJx8cTLc6nloQsCAwEAAaOCAc4w\n"\
  55     "ggHKMB0GA1UdDgQWBBQWtTIb1Mfz4OaO873SsDrusjkY0TCBowYDVR0jBIGbMIGY\n"\
  56     "gBQWtTIb1Mfz4OaO873SsDrusjkY0aF9pHsweTEQMA4GA1UEChMHUm9vdCBDQTEe\n"\
  57     "MBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0\n"\
  58     "IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy\n"\
  59     "dC5vcmeCAQAwDwYDVR0TAQH/BAUwAwEB/zAyBgNVHR8EKzApMCegJaAjhiFodHRw\n"\
  60     "czovL3d3dy5jYWNlcnQub3JnL3Jldm9rZS5jcmwwMAYJYIZIAYb4QgEEBCMWIWh0\n"\
  61     "dHBzOi8vd3d3LmNhY2VydC5vcmcvcmV2b2tlLmNybDA0BglghkgBhvhCAQgEJxYl\n"\
  62     "aHR0cDovL3d3dy5jYWNlcnQub3JnL2luZGV4LnBocD9pZD0xMDBWBglghkgBhvhC\n"\
  63     "AQ0ESRZHVG8gZ2V0IHlvdXIgb3duIGNlcnRpZmljYXRlIGZvciBGUkVFIGhlYWQg\n"\
  64     "b3ZlciB0byBodHRwOi8vd3d3LmNhY2VydC5vcmcwDQYJKoZIhvcNAQEEBQADggIB\n"\
  65     "ACjH7pyCArpcgBLKNQodgW+JapnM8mgPf6fhjViVPr3yBsOQWqy1YPaZQwGjiHCc\n"\
  66     "nWKdpIevZ1gNMDY75q1I08t0AoZxPuIrA2jxNGJARjtT6ij0rPtmlVOKTV39O9lg\n"\
  67     "18p5aTuxZZKmxoGCXJzN600BiqXfEVWqFcofN8CCmHBh22p8lqOOLlQ+TyGpkO/c\n"\
  68     "gr/c6EWtTZBzCDyUZbAEmXZ/4rzCahWqlwQ3JNgelE5tDlG+1sSPypZt90Pf6DBl\n"\
  69     "Jzt7u0NDY8RD97LsaMzhGY4i+5jhe1o+ATc7iwiwovOVThrLm82asduycPAtStvY\n"\
  70     "sONvRUgzEv/+PDIqVPfE94rwiCPCR/5kenHA0R6mY7AHfqQv0wGP3J8rtsYIqQ+T\n"\
  71     "SCX8Ev2fQtzzxD72V7DX3WnRBnc0CkvSyqD/HMaMyRa+xMwyN2hzXwj7UfdJUzYF\n"\
  72     "CpUCTPJ5GhD22Dp1nPMd8aINcGeGG7MW9S/lpOt5hvk9C8JzC6WZrG/8Z7jlLwum\n"\
  73     "GCSNe9FINSkYQKyTYOGWhlC0elnYjyELn8+CkcY7v2vcB5G5l1YjqrZslMZIBjzk\n"\
  74     "zk6q5PYvCdxTby78dOs6Y5nCpqyJvKeyRKANihDjbPIky/qbn3BHLt4Ui9SyIAmW\n"\
  75     "omTxJBzcoTWcFbLUvFUufQb1nA5V9FrWk9p2rSVzTMVD\n"\
  76     "-----END CERTIFICATE-----\n";
  77   /* get a BIO */
  78   bio=BIO_new_mem_buf(mypem, -1);
  79   /* use it to read the PEM formatted certificate from memory into an X509
  80    * structure that SSL can use
  81    */
  82   PEM_read_bio_X509(bio, &cert, 0, NULL);
  83   if (cert == NULL)
  84     printf("PEM_read_bio_X509 failed...\n");
  85
  86   /* get a pointer to the X509 certificate store (which may be empty!) */
  87   store=SSL_CTX_get_cert_store((SSL_CTX *)sslctx);
  88
  89   /* add our certificate to this store */
  90   if (X509_STORE_add_cert(store, cert)==0)
  91     printf("error adding certificate\n");
  92
  93   /* all set to go */
  94   return CURLE_OK ;
  95 }
  96
  97 int main(void)
  98 {
  99   CURL * ch;
 100   CURLcode rv;
 101
 102   rv=curl_global_init(CURL_GLOBAL_ALL);
 103   ch=curl_easy_init();
 104   rv=curl_easy_setopt(ch,CURLOPT_VERBOSE, 0L);
 105   rv=curl_easy_setopt(ch,CURLOPT_HEADER, 0L);
 106   rv=curl_easy_setopt(ch,CURLOPT_NOPROGRESS, 1L);
 107   rv=curl_easy_setopt(ch,CURLOPT_NOSIGNAL, 1L);
 108   rv=curl_easy_setopt(ch,CURLOPT_WRITEFUNCTION, *writefunction);
 109   rv=curl_easy_setopt(ch,CURLOPT_WRITEDATA, stdout);
 110   rv=curl_easy_setopt(ch,CURLOPT_HEADERFUNCTION, *writefunction);
 111   rv=curl_easy_setopt(ch,CURLOPT_WRITEHEADER, stderr);
 112   rv=curl_easy_setopt(ch,CURLOPT_SSLCERTTYPE,"PEM");
 113   rv=curl_easy_setopt(ch,CURLOPT_SSL_VERIFYPEER,1L);
 114   rv=curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");
 115
 116   /* first try: retrieve page without cacerts' certificate -> will fail
 117    */
 118   rv=curl_easy_perform(ch);
 119   if (rv==CURLE_OK)
 120     printf("*** transfer succeeded ***\n");
 121   else
 122     printf("*** transfer failed ***\n");
 123
 124   /* second try: retrieve page using cacerts' certificate -> will succeed
 125    * load the certificate by installing a function doing the nescessary
 126    * "modifications" to the SSL CONTEXT just before link init
 127    */
 128   rv=curl_easy_setopt(ch,CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
 129   rv=curl_easy_perform(ch);
 130   if (rv==CURLE_OK)
 131     printf("*** transfer succeeded ***\n");
 132   else
 133     printf("*** transfer failed ***\n");
 134
 135   curl_easy_cleanup(ch);
 136   curl_global_cleanup();
 137   return rv;
 138 }