NAME

       CURLOPT_PROXY_CRLFILE - HTTPS proxy Certificate Revocation List file

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CRLFILE, char *file);

DESCRIPTION

       This option is for connecting to an HTTPS proxy, not an HTTPS server.

       Pass  a char * to a null-terminated string naming a file with the concatenation of CRL (in
       PEM format) to use in the certificate validation that occurs during the SSL exchange.

       When curl is built to use GnuTLS, there is no way to influence the use of  CRL  passed  to
       help   in   the  verification  process.  When  libcurl  is  built  with  OpenSSL  support,
       X509_V_FLAG_CRL_CHECK and X509_V_FLAG_CRL_CHECK_ALL are  both  set,  requiring  CRL  check
       against all the elements of the certificate chain if a CRL file is passed.

       This    option    makes    sense    only    when    used    in    combination   with   the
       CURLOPT_PROXY_SSL_VERIFYPEER(3) option.

       A specific error code (CURLE_SSL_CRL_BADFILE) is defined with the option. It  is  returned
       when  the  SSL  exchange  fails  because  the  CRL  file  cannot  be loaded.  A failure in
       certificate verification due to a revocation information found in the CRL does not trigger
       this specific error.

       The application does not have to keep the string around after setting this option.

DEFAULT

       NULL

PROTOCOLS

       Used with HTTPS proxy.

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
           curl_easy_setopt(curl, CURLOPT_PROXY, "https://localhost:80");
           curl_easy_setopt(curl, CURLOPT_PROXY_CRLFILE, "/etc/certs/crl.pem");
           res = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in 7.52.0

RETURN VALUE

       Returns   CURLE_OK   if   the   option  is  supported,  CURLE_UNKNOWN_OPTION  if  not,  or
       CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO

       CURLOPT_PROXY_SSL_VERIFYHOST(3),                          CURLOPT_PROXY_SSL_VERIFYPEER(3),
       CURLOPT_SSL_VERIFYHOST(3), CURLOPT_SSL_VERIFYPEER(3)