docs/examples/usercertinmem.c

   1 /***************************************************************************
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   8  * Copyright (C) 2013 - 2017, 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  * Use an in-memory user certificate and RSA key and retrieve an https page.
  24  * </DESC>
  25  */
  26 /* Written by Ishan SinghLevett, based on Theo Borm's cacertinmem.c.
  27  * Note that to maintain simplicity this example does not use a CA certificate
  28  * for peer verification.  However, some form of peer verification
  29  * must be used in real circumstances when a secure connection is required.
  30  */
  31
  32 #include <openssl/ssl.h>
  33 #include <openssl/x509.h>
  34 #include <openssl/pem.h>
  35 #include <curl/curl.h>
  36 #include <stdio.h>
  37
  38 static size_t writefunction(void *ptr, size_t size, size_t nmemb, void *stream)
  39 {
  40   fwrite(ptr, size, nmemb, stream);
  41   return (nmemb*size);
  42 }
  43
  44 static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
  45 {
  46   X509 *cert = NULL;
  47   BIO *bio = NULL;
  48   BIO *kbio = NULL;
  49   RSA *rsa = NULL;
  50   int ret;
  51
  52   const char *mypem = /* www.cacert.org */
  53     "-----BEGIN CERTIFICATE-----\n"\
  54     "MIIHPTCCBSWgAwIBAgIBADANBgkqhkiG9w0BAQQFADB5MRAwDgYDVQQKEwdSb290\n"\
  55     "IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNB\n"\
  56     "IENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRA\n"\
  57     "Y2FjZXJ0Lm9yZzAeFw0wMzAzMzAxMjI5NDlaFw0zMzAzMjkxMjI5NDlaMHkxEDAO\n"\
  58     "BgNVBAoTB1Jvb3QgQ0ExHjAcBgNVBAsTFWh0dHA6Ly93d3cuY2FjZXJ0Lm9yZzEi\n"\
  59     "MCAGA1UEAxMZQ0EgQ2VydCBTaWduaW5nIEF1dGhvcml0eTEhMB8GCSqGSIb3DQEJ\n"\
  60     "ARYSc3VwcG9ydEBjYWNlcnQub3JnMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIIC\n"\
  61     "CgKCAgEAziLA4kZ97DYoB1CW8qAzQIxL8TtmPzHlawI229Z89vGIj053NgVBlfkJ\n"\
  62     "8BLPRoZzYLdufujAWGSuzbCtRRcMY/pnCujW0r8+55jE8Ez64AO7NV1sId6eINm6\n"\
  63     "zWYyN3L69wj1x81YyY7nDl7qPv4coRQKFWyGhFtkZip6qUtTefWIonvuLwphK42y\n"\
  64     "fk1WpRPs6tqSnqxEQR5YYGUFZvjARL3LlPdCfgv3ZWiYUQXw8wWRBB0bF4LsyFe7\n"\
  65     "w2t6iPGwcswlWyCR7BYCEo8y6RcYSNDHBS4CMEK4JZwFaz+qOqfrU0j36NK2B5jc\n"\
  66     "G8Y0f3/JHIJ6BVgrCFvzOKKrF11myZjXnhCLotLddJr3cQxyYN/Nb5gznZY0dj4k\n"\
  67     "epKwDpUeb+agRThHqtdB7Uq3EvbXG4OKDy7YCbZZ16oE/9KTfWgu3YtLq1i6L43q\n"\
  68     "laegw1SJpfvbi1EinbLDvhG+LJGGi5Z4rSDTii8aP8bQUWWHIbEZAWV/RRyH9XzQ\n"\
  69     "QUxPKZgh/TMfdQwEUfoZd9vUFBzugcMd9Zi3aQaRIt0AUMyBMawSB3s42mhb5ivU\n"\
  70     "fslfrejrckzzAeVLIL+aplfKkQABi6F1ITe1Yw1nPkZPcCBnzsXWWdsC4PDSy826\n"\
  71     "YreQQejdIOQpvGQpQsgi3Hia/0PsmBsJUUtaWsJx8cTLc6nloQsCAwEAAaOCAc4w\n"\
  72     "ggHKMB0GA1UdDgQWBBQWtTIb1Mfz4OaO873SsDrusjkY0TCBowYDVR0jBIGbMIGY\n"\
  73     "gBQWtTIb1Mfz4OaO873SsDrusjkY0aF9pHsweTEQMA4GA1UEChMHUm9vdCBDQTEe\n"\
  74     "MBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0\n"\
  75     "IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy\n"\
  76     "dC5vcmeCAQAwDwYDVR0TAQH/BAUwAwEB/zAyBgNVHR8EKzApMCegJaAjhiFodHRw\n"\
  77     "czovL3d3dy5jYWNlcnQub3JnL3Jldm9rZS5jcmwwMAYJYIZIAYb4QgEEBCMWIWh0\n"\
  78     "dHBzOi8vd3d3LmNhY2VydC5vcmcvcmV2b2tlLmNybDA0BglghkgBhvhCAQgEJxYl\n"\
  79     "aHR0cDovL3d3dy5jYWNlcnQub3JnL2luZGV4LnBocD9pZD0xMDBWBglghkgBhvhC\n"\
  80     "AQ0ESRZHVG8gZ2V0IHlvdXIgb3duIGNlcnRpZmljYXRlIGZvciBGUkVFIGhlYWQg\n"\
  81     "b3ZlciB0byBodHRwOi8vd3d3LmNhY2VydC5vcmcwDQYJKoZIhvcNAQEEBQADggIB\n"\
  82     "ACjH7pyCArpcgBLKNQodgW+JapnM8mgPf6fhjViVPr3yBsOQWqy1YPaZQwGjiHCc\n"\
  83     "nWKdpIevZ1gNMDY75q1I08t0AoZxPuIrA2jxNGJARjtT6ij0rPtmlVOKTV39O9lg\n"\
  84     "18p5aTuxZZKmxoGCXJzN600BiqXfEVWqFcofN8CCmHBh22p8lqOOLlQ+TyGpkO/c\n"\
  85     "gr/c6EWtTZBzCDyUZbAEmXZ/4rzCahWqlwQ3JNgelE5tDlG+1sSPypZt90Pf6DBl\n"\
  86     "Jzt7u0NDY8RD97LsaMzhGY4i+5jhe1o+ATc7iwiwovOVThrLm82asduycPAtStvY\n"\
  87     "sONvRUgzEv/+PDIqVPfE94rwiCPCR/5kenHA0R6mY7AHfqQv0wGP3J8rtsYIqQ+T\n"\
  88     "SCX8Ev2fQtzzxD72V7DX3WnRBnc0CkvSyqD/HMaMyRa+xMwyN2hzXwj7UfdJUzYF\n"\
  89     "CpUCTPJ5GhD22Dp1nPMd8aINcGeGG7MW9S/lpOt5hvk9C8JzC6WZrG/8Z7jlLwum\n"\
  90     "GCSNe9FINSkYQKyTYOGWhlC0elnYjyELn8+CkcY7v2vcB5G5l1YjqrZslMZIBjzk\n"\
  91     "zk6q5PYvCdxTby78dOs6Y5nCpqyJvKeyRKANihDjbPIky/qbn3BHLt4Ui9SyIAmW\n"\
  92     "omTxJBzcoTWcFbLUvFUufQb1nA5V9FrWk9p2rSVzTMVD\n"\
  93     "-----END CERTIFICATE-----\n";
  94
  95 /*replace the XXX with the actual RSA key*/
  96   const char *mykey =
  97     "-----BEGIN RSA PRIVATE KEY-----\n"\
  98     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
  99     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 100     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 101     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 102     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 103     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 104     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 105     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 106     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 107     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 108     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 109     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 110     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 111     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 112     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 113     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
 114     "-----END RSA PRIVATE KEY-----\n";
 115
 116   (void)curl; /* avoid warnings */
 117   (void)parm; /* avoid warnings */
 118
 119   /* get a BIO */
 120   bio = BIO_new_mem_buf((char *)mypem, -1);
 121
 122   if(bio == NULL) {
 123     printf("BIO_new_mem_buf failed\n");
 124   }
 125
 126   /* use it to read the PEM formatted certificate from memory into an X509
 127    * structure that SSL can use
 128    */
 129   cert = PEM_read_bio_X509(bio, NULL, 0, NULL);
 130   if(cert == NULL) {
 131     printf("PEM_read_bio_X509 failed...\n");
 132   }
 133
 134   /*tell SSL to use the X509 certificate*/
 135   ret = SSL_CTX_use_certificate((SSL_CTX*)sslctx, cert);
 136   if(ret != 1) {
 137     printf("Use certificate failed\n");
 138   }
 139
 140   /*create a bio for the RSA key*/
 141   kbio = BIO_new_mem_buf((char *)mykey, -1);
 142   if(kbio == NULL) {
 143     printf("BIO_new_mem_buf failed\n");
 144   }
 145
 146   /*read the key bio into an RSA object*/
 147   rsa = PEM_read_bio_RSAPrivateKey(kbio, NULL, 0, NULL);
 148   if(rsa == NULL) {
 149     printf("Failed to create key bio\n");
 150   }
 151
 152   /*tell SSL to use the RSA key from memory*/
 153   ret = SSL_CTX_use_RSAPrivateKey((SSL_CTX*)sslctx, rsa);
 154   if(ret != 1) {
 155     printf("Use Key failed\n");
 156   }
 157
 158   /* free resources that have been allocated by openssl functions */
 159   if(bio)
 160     BIO_free(bio);
 161
 162   if(kbio)
 163     BIO_free(kbio);
 164
 165   if(rsa)
 166     RSA_free(rsa);
 167
 168   if(cert)
 169     X509_free(cert);
 170
 171   /* all set to go */
 172   return CURLE_OK;
 173 }
 174
 175 int main(void)
 176 {
 177   CURL *ch;
 178   CURLcode rv;
 179
 180   rv = curl_global_init(CURL_GLOBAL_ALL);
 181   ch = curl_easy_init();
 182   rv = curl_easy_setopt(ch, CURLOPT_VERBOSE, 0L);
 183   rv = curl_easy_setopt(ch, CURLOPT_HEADER, 0L);
 184   rv = curl_easy_setopt(ch, CURLOPT_NOPROGRESS, 1L);
 185   rv = curl_easy_setopt(ch, CURLOPT_NOSIGNAL, 1L);
 186   rv = curl_easy_setopt(ch, CURLOPT_WRITEFUNCTION, writefunction);
 187   rv = curl_easy_setopt(ch, CURLOPT_WRITEDATA, stdout);
 188   rv = curl_easy_setopt(ch, CURLOPT_HEADERFUNCTION, writefunction);
 189   rv = curl_easy_setopt(ch, CURLOPT_HEADERDATA, stderr);
 190   rv = curl_easy_setopt(ch, CURLOPT_SSLCERTTYPE, "PEM");
 191
 192   /* both VERIFYPEER and VERIFYHOST are set to 0 in this case because there is
 193      no CA certificate*/
 194
 195   rv = curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 0L);
 196   rv = curl_easy_setopt(ch, CURLOPT_SSL_VERIFYHOST, 0L);
 197   rv = curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");
 198   rv = curl_easy_setopt(ch, CURLOPT_SSLKEYTYPE, "PEM");
 199
 200   /* first try: retrieve page without user certificate and key -> will fail
 201    */
 202   rv = curl_easy_perform(ch);
 203   if(rv==CURLE_OK) {
 204     printf("*** transfer succeeded ***\n");
 205   }
 206   else {
 207     printf("*** transfer failed ***\n");
 208   }
 209
 210   /* second try: retrieve page using user certificate and key -> will succeed
 211    * load the certificate and key by installing a function doing the necessary
 212    * "modifications" to the SSL CONTEXT just before link init
 213    */
 214   rv = curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
 215   rv = curl_easy_perform(ch);
 216   if(rv==CURLE_OK) {
 217     printf("*** transfer succeeded ***\n");
 218   }
 219   else {
 220     printf("*** transfer failed ***\n");
 221   }
 222
 223   curl_easy_cleanup(ch);
 224   curl_global_cleanup();
 225   return rv;
 226 }