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      8  * Copyright (C) 2013 - 2016, 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
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     21  ***************************************************************************/
     22 /* <DESC>
     23 /* Example using an in memory PEM user certificate and RSA key to retrieve an
     24  * https page.
     25  * </DESC>
     26  */
     27 /* Written by Ishan SinghLevett, based on Theo Borm's cacertinmem.c.
     28  * Note that to maintain simplicity this example does not use a CA certificate
     29  * for peer verification.  However, some form of peer verification
     30  * must be used in real circumstances when a secure connection is required.
     31  */
     32 
     33 #include <openssl/ssl.h>
     34 #include <openssl/x509.h>
     35 #include <openssl/pem.h>
     36 #include <curl/curl.h>
     37 #include <stdio.h>
     38 
     39 static size_t writefunction(void *ptr, size_t size, size_t nmemb, void *stream)
     40 {
     41   fwrite(ptr, size, nmemb, stream);
     42   return (nmemb*size);
     43 }
     44 
     45 static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
     46 {
     47   X509 *cert = NULL;
     48   BIO *bio = NULL;
     49   BIO *kbio = NULL;
     50   RSA *rsa = NULL;
     51   int ret;
     52 
     53   const char *mypem = /* www.cacert.org */
     54     "-----BEGIN CERTIFICATE-----\n"\
     55     "MIIHPTCCBSWgAwIBAgIBADANBgkqhkiG9w0BAQQFADB5MRAwDgYDVQQKEwdSb290\n"\
     56     "IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNB\n"\
     57     "IENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRA\n"\
     58     "Y2FjZXJ0Lm9yZzAeFw0wMzAzMzAxMjI5NDlaFw0zMzAzMjkxMjI5NDlaMHkxEDAO\n"\
     59     "BgNVBAoTB1Jvb3QgQ0ExHjAcBgNVBAsTFWh0dHA6Ly93d3cuY2FjZXJ0Lm9yZzEi\n"\
     60     "MCAGA1UEAxMZQ0EgQ2VydCBTaWduaW5nIEF1dGhvcml0eTEhMB8GCSqGSIb3DQEJ\n"\
     61     "ARYSc3VwcG9ydEBjYWNlcnQub3JnMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIIC\n"\
     62     "CgKCAgEAziLA4kZ97DYoB1CW8qAzQIxL8TtmPzHlawI229Z89vGIj053NgVBlfkJ\n"\
     63     "8BLPRoZzYLdufujAWGSuzbCtRRcMY/pnCujW0r8+55jE8Ez64AO7NV1sId6eINm6\n"\
     64     "zWYyN3L69wj1x81YyY7nDl7qPv4coRQKFWyGhFtkZip6qUtTefWIonvuLwphK42y\n"\
     65     "fk1WpRPs6tqSnqxEQR5YYGUFZvjARL3LlPdCfgv3ZWiYUQXw8wWRBB0bF4LsyFe7\n"\
     66     "w2t6iPGwcswlWyCR7BYCEo8y6RcYSNDHBS4CMEK4JZwFaz+qOqfrU0j36NK2B5jc\n"\
     67     "G8Y0f3/JHIJ6BVgrCFvzOKKrF11myZjXnhCLotLddJr3cQxyYN/Nb5gznZY0dj4k\n"\
     68     "epKwDpUeb+agRThHqtdB7Uq3EvbXG4OKDy7YCbZZ16oE/9KTfWgu3YtLq1i6L43q\n"\
     69     "laegw1SJpfvbi1EinbLDvhG+LJGGi5Z4rSDTii8aP8bQUWWHIbEZAWV/RRyH9XzQ\n"\
     70     "QUxPKZgh/TMfdQwEUfoZd9vUFBzugcMd9Zi3aQaRIt0AUMyBMawSB3s42mhb5ivU\n"\
     71     "fslfrejrckzzAeVLIL+aplfKkQABi6F1ITe1Yw1nPkZPcCBnzsXWWdsC4PDSy826\n"\
     72     "YreQQejdIOQpvGQpQsgi3Hia/0PsmBsJUUtaWsJx8cTLc6nloQsCAwEAAaOCAc4w\n"\
     73     "ggHKMB0GA1UdDgQWBBQWtTIb1Mfz4OaO873SsDrusjkY0TCBowYDVR0jBIGbMIGY\n"\
     74     "gBQWtTIb1Mfz4OaO873SsDrusjkY0aF9pHsweTEQMA4GA1UEChMHUm9vdCBDQTEe\n"\
     75     "MBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0\n"\
     76     "IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy\n"\
     77     "dC5vcmeCAQAwDwYDVR0TAQH/BAUwAwEB/zAyBgNVHR8EKzApMCegJaAjhiFodHRw\n"\
     78     "czovL3d3dy5jYWNlcnQub3JnL3Jldm9rZS5jcmwwMAYJYIZIAYb4QgEEBCMWIWh0\n"\
     79     "dHBzOi8vd3d3LmNhY2VydC5vcmcvcmV2b2tlLmNybDA0BglghkgBhvhCAQgEJxYl\n"\
     80     "aHR0cDovL3d3dy5jYWNlcnQub3JnL2luZGV4LnBocD9pZD0xMDBWBglghkgBhvhC\n"\
     81     "AQ0ESRZHVG8gZ2V0IHlvdXIgb3duIGNlcnRpZmljYXRlIGZvciBGUkVFIGhlYWQg\n"\
     82     "b3ZlciB0byBodHRwOi8vd3d3LmNhY2VydC5vcmcwDQYJKoZIhvcNAQEEBQADggIB\n"\
     83     "ACjH7pyCArpcgBLKNQodgW+JapnM8mgPf6fhjViVPr3yBsOQWqy1YPaZQwGjiHCc\n"\
     84     "nWKdpIevZ1gNMDY75q1I08t0AoZxPuIrA2jxNGJARjtT6ij0rPtmlVOKTV39O9lg\n"\
     85     "18p5aTuxZZKmxoGCXJzN600BiqXfEVWqFcofN8CCmHBh22p8lqOOLlQ+TyGpkO/c\n"\
     86     "gr/c6EWtTZBzCDyUZbAEmXZ/4rzCahWqlwQ3JNgelE5tDlG+1sSPypZt90Pf6DBl\n"\
     87     "Jzt7u0NDY8RD97LsaMzhGY4i+5jhe1o+ATc7iwiwovOVThrLm82asduycPAtStvY\n"\
     88     "sONvRUgzEv/+PDIqVPfE94rwiCPCR/5kenHA0R6mY7AHfqQv0wGP3J8rtsYIqQ+T\n"\
     89     "SCX8Ev2fQtzzxD72V7DX3WnRBnc0CkvSyqD/HMaMyRa+xMwyN2hzXwj7UfdJUzYF\n"\
     90     "CpUCTPJ5GhD22Dp1nPMd8aINcGeGG7MW9S/lpOt5hvk9C8JzC6WZrG/8Z7jlLwum\n"\
     91     "GCSNe9FINSkYQKyTYOGWhlC0elnYjyELn8+CkcY7v2vcB5G5l1YjqrZslMZIBjzk\n"\
     92     "zk6q5PYvCdxTby78dOs6Y5nCpqyJvKeyRKANihDjbPIky/qbn3BHLt4Ui9SyIAmW\n"\
     93     "omTxJBzcoTWcFbLUvFUufQb1nA5V9FrWk9p2rSVzTMVD\n"\
     94     "-----END CERTIFICATE-----\n";
     95 
     96 /*replace the XXX with the actual RSA key*/
     97   const char *mykey =
     98     "-----BEGIN RSA PRIVATE KEY-----\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     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    115     "-----END RSA PRIVATE KEY-----\n";
    116 
    117   (void)curl; /* avoid warnings */
    118   (void)parm; /* avoid warnings */
    119 
    120   /* get a BIO */
    121   bio = BIO_new_mem_buf((char *)mypem, -1);
    122 
    123   if(bio == NULL) {
    124     printf("BIO_new_mem_buf failed\n");
    125   }
    126 
    127   /* use it to read the PEM formatted certificate from memory into an X509
    128    * structure that SSL can use
    129    */
    130   cert = PEM_read_bio_X509(bio, NULL, 0, NULL);
    131   if(cert == NULL) {
    132     printf("PEM_read_bio_X509 failed...\n");
    133   }
    134 
    135   /*tell SSL to use the X509 certificate*/
    136   ret = SSL_CTX_use_certificate((SSL_CTX*)sslctx, cert);
    137   if(ret != 1) {
    138     printf("Use certificate failed\n");
    139   }
    140 
    141   /*create a bio for the RSA key*/
    142   kbio = BIO_new_mem_buf((char *)mykey, -1);
    143   if(kbio == NULL) {
    144     printf("BIO_new_mem_buf failed\n");
    145   }
    146 
    147   /*read the key bio into an RSA object*/
    148   rsa = PEM_read_bio_RSAPrivateKey(kbio, NULL, 0, NULL);
    149   if(rsa == NULL) {
    150     printf("Failed to create key bio\n");
    151   }
    152 
    153   /*tell SSL to use the RSA key from memory*/
    154   ret = SSL_CTX_use_RSAPrivateKey((SSL_CTX*)sslctx, rsa);
    155   if(ret != 1) {
    156     printf("Use Key failed\n");
    157   }
    158 
    159   /* free resources that have been allocated by openssl functions */
    160   if(bio)
    161     BIO_free(bio);
    162 
    163   if(kbio)
    164     BIO_free(kbio);
    165 
    166   if(rsa)
    167     RSA_free(rsa);
    168 
    169   if(cert)
    170     X509_free(cert);
    171 
    172   /* all set to go */
    173   return CURLE_OK;
    174 }
    175 
    176 int main(void)
    177 {
    178   CURL *ch;
    179   CURLcode rv;
    180 
    181   rv = curl_global_init(CURL_GLOBAL_ALL);
    182   ch = curl_easy_init();
    183   rv = curl_easy_setopt(ch, CURLOPT_VERBOSE, 0L);
    184   rv = curl_easy_setopt(ch, CURLOPT_HEADER, 0L);
    185   rv = curl_easy_setopt(ch, CURLOPT_NOPROGRESS, 1L);
    186   rv = curl_easy_setopt(ch, CURLOPT_NOSIGNAL, 1L);
    187   rv = curl_easy_setopt(ch, CURLOPT_WRITEFUNCTION, writefunction);
    188   rv = curl_easy_setopt(ch, CURLOPT_WRITEDATA, stdout);
    189   rv = curl_easy_setopt(ch, CURLOPT_HEADERFUNCTION, writefunction);
    190   rv = curl_easy_setopt(ch, CURLOPT_HEADERDATA, stderr);
    191   rv = curl_easy_setopt(ch, CURLOPT_SSLCERTTYPE, "PEM");
    192 
    193   /* both VERIFYPEER and VERIFYHOST are set to 0 in this case because there is
    194      no CA certificate*/
    195 
    196   rv = curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 0L);
    197   rv = curl_easy_setopt(ch, CURLOPT_SSL_VERIFYHOST, 0L);
    198   rv = curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");
    199   rv = curl_easy_setopt(ch, CURLOPT_SSLKEYTYPE, "PEM");
    200 
    201   /* first try: retrieve page without user certificate and key -> will fail
    202    */
    203   rv = curl_easy_perform(ch);
    204   if(rv==CURLE_OK) {
    205     printf("*** transfer succeeded ***\n");
    206   }
    207   else {
    208     printf("*** transfer failed ***\n");
    209   }
    210 
    211   /* second try: retrieve page using user certificate and key -> will succeed
    212    * load the certificate and key by installing a function doing the necessary
    213    * "modifications" to the SSL CONTEXT just before link init
    214    */
    215   rv = curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
    216   rv = curl_easy_perform(ch);
    217   if(rv==CURLE_OK) {
    218     printf("*** transfer succeeded ***\n");
    219   }
    220   else {
    221     printf("*** transfer failed ***\n");
    222   }
    223 
    224   curl_easy_cleanup(ch);
    225   curl_global_cleanup();
    226   return rv;
    227 }
    228