NAME

       CURLOPT_PROXY_SSL_VERIFYHOST - verify the proxy certificate's name against host

SYNOPSIS

       #include <curl/curl.h>

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

DESCRIPTION

       Pass  a  long set to 2L as asking curl to verify in the HTTPS proxy's certificate name fields against the
       proxy name.

       This option determines whether libcurl verifies that the proxy cert contains the  correct  name  for  the
       name it is known as.

       When  CURLOPT_PROXY_SSL_VERIFYHOST(3)  is  2,  the proxy certificate must indicate that the server is the
       proxy to which you meant to connect to, or the connection fails.

       Curl considers the proxy the intended one when the Common Name field or a Subject Alternate Name field in
       the certificate matches the hostname in the proxy string which you told curl to use.

       If verify value is set to 1:

       In  7.28.0  and earlier: treated as a debug option of some sorts, not supported anymore due to frequently
       leading to programmer mistakes.

       From 7.28.1 to 7.65.3: setting it to 1 made curl_easy_setopt(3) return an  error  and  leaving  the  flag
       untouched.

       From 7.66.0: treats 1 and 2 the same.

       When the verify value is 0L, the connection succeeds regardless of the names used in the certificate. Use
       that ability with caution!

       See also CURLOPT_PROXY_SSL_VERIFYPEER(3) to verify the digital signature of the proxy certificate.

DEFAULT

       2

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 name check please */
           curl_easy_setopt(curl, CURLOPT_PROXY_SSL_VERIFYHOST, 2L);

           curl_easy_perform(curl);
         }
       }

AVAILABILITY

       Added in curl 7.52.0

RETURN VALUE

       Returns CURLE_OK if TLS is supported, and CURLE_UNKNOWN_OPTION if not.

       If 1 is set as argument, CURLE_BAD_FUNCTION_ARGUMENT is returned.

SEE ALSO

       CURLOPT_CAINFO(3), CURLOPT_PROXY_CAINFO(3), CURLOPT_PROXY_SSL_VERIFYPEER(3), CURLOPT_SSL_VERIFYPEER(3)