NAME

       CURLOPT_PROXY_SSL_VERIFYPEER - verify the proxy's SSL certificate

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_VERIFYPEER,
                                 long verify);

DESCRIPTION

       Pass a long as parameter set to 1L to enable or 0L to disable.

       This  option  tells  curl  to  verify the authenticity of the HTTPS proxy's certificate. A
       value of 1 means curl verifies; 0 (zero) means it does not.

       This is the proxy version of CURLOPT_SSL_VERIFYPEER(3) that is  used  for  ordinary  HTTPS
       servers.

       When  negotiating  a  TLS or SSL connection, the server sends a certificate indicating its
       identity. Curl verifies whether the certificate is authentic, i.e. that you can trust that
       the  server  is who the certificate says it is.  This trust is based on a chain of digital
       signatures, rooted in certification authority (CA) certificates you supply.  curl  uses  a
       default  bundle of CA certificates (the path for that is determined at build time) and you
       can  specify  alternate  certificates  with  the  CURLOPT_PROXY_CAINFO(3)  option  or  the
       CURLOPT_PROXY_CAPATH(3) option.

       When  CURLOPT_PROXY_SSL_VERIFYPEER(3) is enabled, and the verification fails to prove that
       the certificate is authentic, the connection fails. When the  option  is  zero,  the  peer
       certificate verification succeeds regardless.

       Authenticating  the  certificate  is not enough to be sure about the server. You typically
       also want to ensure that the server  is  the  server  you  mean  to  be  talking  to.  Use
       CURLOPT_PROXY_SSL_VERIFYHOST(3)  for  that. The check that the hostname in the certificate
       is  valid  for  the  hostname  you  are  connecting  to  is  done  independently  of   the
       CURLOPT_PROXY_SSL_VERIFYPEER(3) option.

       WARNING:  disabling  verification  of the certificate allows bad guys to man-in-the-middle
       the communication without you knowing it. Disabling verification makes  the  communication
       insecure.  Just  having  encryption on a transfer is not enough as you cannot be sure that
       you are communicating with the correct end-point.

DEFAULT

       1

PROTOCOLS

       This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

       All TLS backends support this option.

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

           /* Set the default value: strict certificate check please */
           curl_easy_setopt(curl, CURLOPT_PROXY_SSL_VERIFYPEER, 1L);

           curl_easy_perform(curl);
         }
       }

AVAILABILITY

       Added in curl 7.52.0

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

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