CURLOPT_PROXY_SSL_VERIFYPEER(3)                       curl_easy_setopt options

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 verifies the authenticity of the HTTPS
       proxy's certificate. A value of 1 means curl verifies; 0 (zero) means
       it doesn't.

       This is the proxy version of _SSL_VERIFYPEER&section=3">CURLOPT_SSL_VERIFYPEER(3) that's 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 _PROXY_CAINFO&section=3">CURLOPT_PROXY_CAINFO(3) option or the
       _PROXY_CAPATH&section=3">CURLOPT_PROXY_CAPATH(3) option.

       When _PROXY_SSL_VERIFYPEER&section=3">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 _PROXY_SSL_VERIFYHOST&section=3">CURLOPT_PROXY_SSL_VERIFYHOST(3) for
       that. The check that the host name in the certificate is valid for the
       host name you're connecting to is done independently of the
       _PROXY_SSL_VERIFYPEER&section=3">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
       All

EXAMPLE
       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 7.52.0

       If built TLS enabled.

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_VERIFYPEER(3),
       CURLOPT_SSL_VERIFYHOST(3),

libcurl 7.77.0                 November 4, 2020
                                               CURLOPT_PROXY_SSL_VERIFYPEER(3)