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      7  *
      8  * Copyright (C) 1998 - 2019, 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 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  * CA cert in memory with OpenSSL to get a HTTPS page.
     24  * </DESC>
     25  */
     26 
     27 #include <openssl/err.h>
     28 #include <openssl/ssl.h>
     29 #include <curl/curl.h>
     30 #include <stdio.h>
     31 
     32 static size_t writefunction(void *ptr, size_t size, size_t nmemb, void *stream)
     33 {
     34   fwrite(ptr, size, nmemb, (FILE *)stream);
     35   return (nmemb*size);
     36 }
     37 
     38 static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
     39 {
     40   CURLcode rv = CURLE_ABORTED_BY_CALLBACK;
     41 
     42   /** This example uses two (fake) certificates **/
     43   static const char mypem[] =
     44     "-----BEGIN CERTIFICATE-----\n"
     45     "MIIH0zCCBbugAwIBAgIIXsO3pkN/pOAwDQYJKoZIhvcNAQEFBQAwQjESMBAGA1UE\n"
     46     "AwwJQUNDVlJBSVoxMRAwDgYDVQQLDAdQS0lBQ0NWMQ0wCwYDVQQKDARBQ0NWMQsw\n"
     47     "CQYDVQQGEwJFUzAeFw0xMTA1MDUwOTM3MzdaFw0zMDEyMzEwOTM3MzdaMEIxEjAQ\n"
     48     "BgNVBAMMCUFDQ1ZSQUlaMTEQMA4GA1UECwwHUEtJQUNDVjENMAsGA1UECgwEQUND\n"
     49     "VjELMAkGA1UEBhMCRVMwggIiMA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQCb\n"
     50     "qau/YUqXry+XZpp0X9DZlv3P4uRm7x8fRzPCRKPfmt4ftVTdFXxpNRFvu8gMjmoY\n"
     51     "HtiP2Ra8EEg2XPBjs5BaXCQ316PWywlxufEBcoSwfdtNgM3802/J+Nq2DoLSRYWo\n"
     52     "G2ioPej0RGy9ocLLA76MPhMAhN9KSMDjIgro6TenGEyxCQ0jVn8ETdkXhBilyNpA\n"
     53     "0KIV9VMJcRz/RROE5iZe+OCIHAr8Fraocwa48GOEAqDGWuzndN9wrqODJerWx5eH\n"
     54     "k6fGioozl2A3ED6XPm4pFdahD9GILBKfb6qkxkLrQaLjlUPTAYVtjrs78yM2x/47\n"
     55     "JyCpZET/LtZ1qmxNYEAZSUNUY9rizLpm5U9EelvZaoErQNV/+QEnWCzI7UiRfD+m\n"
     56     "AM/EKXMRNt6GGT6d7hmKG9Ww7Y49nCrADdg9ZuM8Db3VlFzi4qc1GwQA9j9ajepD\n"
     57     "vV+JHanBsMyZ4k0ACtrJJ1vnE5Bc5PUzolVt3OAJTS+xJlsndQAJxGJ3KQhfnlms\n"
     58     "tn6tn1QwIgPBHnFk/vk4CpYY3QIUrCPLBhwepH2NDd4nQeit2hW3sCPdK6jT2iWH\n"
     59     "7ehVRE2I9DZ+hJp4rPcOVkkO1jMl1oRQQmwgEh0q1b688nCBpHBgvgW1m54ERL5h\n"
     60     "I6zppSSMEYCUWqKiuUnSwdzRp+0xESyeGabu4VXhwOrPDYTkF7eifKXeVSUG7szA\n"
     61     "h1xA2syVP1XgNce4hL60Xc16gwFy7ofmXx2utYXGJt/mwZrpHgJHnyqobalbz+xF\n"
     62     "d3+YJ5oyXSrjhO7FmGYvliAd3djDJ9ew+f7Zfc3Qn48LFFhRny+Lwzgt3uiP1o2H\n"
     63     "pPVWQxaZLPSkVrQ0uGE3ycJYgBugl6H8WY3pEfbRD0tVNEYqi4Y7\n"
     64     "-----END CERTIFICATE-----\n"
     65     "-----BEGIN CERTIFICATE-----\n"
     66     "MIIFtTCCA52gAwIBAgIIYY3HhjsBggUwDQYJKoZIhvcNAQEFBQAwRDEWMBQGA1UE\n"
     67     "AwwNQUNFRElDT00gUm9vdDEMMAoGA1UECwwDUEtJMQ8wDQYDVQQKDAZFRElDT00x\n"
     68     "CzAJBgNVBAYTAkVTMB4XDTA4MDQxODE2MjQyMloXDTI4MDQxMzE2MjQyMlowRDEW\n"
     69     "MBQGA1UEAwwNQUNFRElDT00gUm9vdDEMMAoGA1UECwwDUEtJMQ8wDQYDVQQKDAZF\n"
     70     "RElDT00xCzAJBgNVBAYTAkVTMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKC\n"
     71     "AgEA/5KV4WgGdrQsyFhIyv2AVClVYyT/kGWbEHV7w2rbYgIB8hiGtXxaOLHkWLn7\n"
     72     "09gtn70yN78sFW2+tfQh0hOR2QetAQXW8713zl9CgQr5auODAKgrLlUTY4HKRxx7\n"
     73     "XBZXehuDYAQ6PmXDzQHe3qTWDLqO3tkE7hdWIpuPY/1NFgu3e3eM+SW10W2ZEi5P\n"
     74     "gvoFNTPhNahXwOf9jU8/kzJPeGYDdwdY6ZXIfj7QeQCM8htRM5u8lOk6e25SLTKe\n"
     75     "I6RF+7YuE7CLGLHdztUdp0J/Vb77W7tH1PwkzQSulgUV1qzOMPPKC8W64iLgpq0i\n"
     76     "5ALudBF/TP94HTXa5gI06xgSYXcGCRZj6hitoocf8seACQl1ThCojz2GuHURwCRi\n"
     77     "ipZ7SkXp7FnFvmuD5uHorLUwHv4FB4D54SMNUI8FmP8sX+g7tq3PgbUhh8oIKiMn\n"
     78     "MCArz+2UW6yyetLHKKGKC5tNSixthT8Jcjxn4tncB7rrZXtaAWPWkFtPF2Y9fwsZ\n"
     79     "o5NjEFIqnxQWWOLcpfShFosOkYuByptZ+thrkQdlVV9SH686+5DdaaVbnG0OLLb6\n"
     80     "zqylfDJKZ0DcMDQj3dcEI2bw/FWAp/tmGYI1Z2JwOV5vx+qQQEQIHriy1tvuWacN\n"
     81     "GHk0vFQYXlPKNFHtRQrmjseCNj6nOGOpMCwXEGCSn1WHElkQwg9naRHMTh5+Spqt\n"
     82     "r0CodaxWkHS4oJyleW/c6RrIaQXpuvoDs3zk4E7Czp3otkYNbn5XOmeUwssfnHdK\n"
     83     "Z05phkOTOPu220+DkdRgfks+KzgHVZhepA==\n"
     84     "-----END CERTIFICATE-----\n";
     85 
     86   BIO *cbio = BIO_new_mem_buf(mypem, sizeof(mypem));
     87   X509_STORE  *cts = SSL_CTX_get_cert_store((SSL_CTX *)sslctx);
     88   X509_INFO *itmp;
     89   int i, count = 0;
     90   STACK_OF(X509_INFO) *inf;
     91   (void)curl;
     92   (void)parm;
     93 
     94   if(!cts || !cbio) {
     95     return rv;
     96   }
     97 
     98   inf = PEM_X509_INFO_read_bio(cbio, NULL, NULL, NULL);
     99 
    100   if(!inf) {
    101     BIO_free(cbio);
    102     return rv;
    103   }
    104 
    105   for(i = 0; i < sk_X509_INFO_num(inf); i++) {
    106     itmp = sk_X509_INFO_value(inf, i);
    107     if(itmp->x509) {
    108       X509_STORE_add_cert(cts, itmp->x509);
    109       count++;
    110     }
    111     if(itmp->crl) {
    112       X509_STORE_add_crl(cts, itmp->crl);
    113       count++;
    114     }
    115   }
    116 
    117   sk_X509_INFO_pop_free(inf, X509_INFO_free);
    118   BIO_free(cbio);
    119 
    120   rv = CURLE_OK;
    121   return rv;
    122 }
    123 
    124 int main(void)
    125 {
    126   CURL *ch;
    127   CURLcode rv;
    128 
    129   rv = curl_global_init(CURL_GLOBAL_ALL);
    130   ch = curl_easy_init();
    131   rv = curl_easy_setopt(ch, CURLOPT_VERBOSE, 0L);
    132   rv = curl_easy_setopt(ch, CURLOPT_HEADER, 0L);
    133   rv = curl_easy_setopt(ch, CURLOPT_NOPROGRESS, 1L);
    134   rv = curl_easy_setopt(ch, CURLOPT_NOSIGNAL, 1L);
    135   rv = curl_easy_setopt(ch, CURLOPT_WRITEFUNCTION, *writefunction);
    136   rv = curl_easy_setopt(ch, CURLOPT_WRITEDATA, stdout);
    137   rv = curl_easy_setopt(ch, CURLOPT_HEADERFUNCTION, *writefunction);
    138   rv = curl_easy_setopt(ch, CURLOPT_HEADERDATA, stderr);
    139   rv = curl_easy_setopt(ch, CURLOPT_SSLCERTTYPE, "PEM");
    140   rv = curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 1L);
    141   rv = curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");
    142 
    143   /* Turn off the default CA locations, otherwise libcurl will load CA
    144    * certificates from the locations that were detected/specified at
    145    * build-time
    146    */
    147   rv = curl_easy_setopt(ch, CURLOPT_CAINFO, NULL);
    148   rv = curl_easy_setopt(ch, CURLOPT_CAPATH, NULL);
    149 
    150   /* first try: retrieve page without ca certificates -> should fail
    151    * unless libcurl was built --with-ca-fallback enabled at build-time
    152    */
    153   rv = curl_easy_perform(ch);
    154   if(rv == CURLE_OK)
    155     printf("*** transfer succeeded ***\n");
    156   else
    157     printf("*** transfer failed ***\n");
    158 
    159   /* use a fresh connection (optional)
    160    * this option seriously impacts performance of multiple transfers but
    161    * it is necessary order to demonstrate this example. recall that the
    162    * ssl ctx callback is only called _before_ an SSL connection is
    163    * established, therefore it will not affect existing verified SSL
    164    * connections already in the connection cache associated with this
    165    * handle. normally you would set the ssl ctx function before making
    166    * any transfers, and not use this option.
    167    */
    168   rv = curl_easy_setopt(ch, CURLOPT_FRESH_CONNECT, 1L);
    169 
    170   /* second try: retrieve page using cacerts' certificate -> will succeed
    171    * load the certificate by installing a function doing the necessary
    172    * "modifications" to the SSL CONTEXT just before link init
    173    */
    174   rv = curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
    175   rv = curl_easy_perform(ch);
    176   if(rv == CURLE_OK)
    177     printf("*** transfer succeeded ***\n");
    178   else
    179     printf("*** transfer failed ***\n");
    180 
    181   curl_easy_cleanup(ch);
    182   curl_global_cleanup();
    183   return rv;
    184 }
    185