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CURLOPT_DOH_SSL_VERIFYPEER(3)       libcurl      CURLOPT_DOH_SSL_VERIFYPEER(3)


NAME

       CURLOPT_DOH_SSL_VERIFYPEER - verify the DoH SSL certificate


SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_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 DoH (DNS-over-
       HTTPS) server's certificate. A value of 1 means curl verifies; 0 (zero)
       means it does not.

       This option is the DoH equivalent of CURLOPT_SSL_VERIFYPEER(3) and only
       affects requests to the DoH server.

       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_CAINFO(3) option or the CURLOPT_CAPATH(3)
       option.

       When CURLOPT_DOH_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_DOH_SSL_VERIFYHOST(3) for that.
       The check that the host name in the certificate is valid for the host
       name you are connecting to is done independently of the
       CURLOPT_DOH_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

       DoH


EXAMPLE

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

         curl_easy_setopt(curl, CURLOPT_DOH_URL, "https://cloudflare-dns.com/dns-query");

         /* Disable certificate verification of the DoH server */
         curl_easy_setopt(curl, CURLOPT_DOH_SSL_VERIFYPEER, 0L);

         curl_easy_perform(curl);
       }


AVAILABILITY

       Added in 7.76.0

       If built TLS enabled.


RETURN VALUE

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


SEE ALSO

       CURLOPT_DOH_SSL_VERIFYHOST(3),  CURLOPT_SSL_VERIFYHOST(3),
       CURLOPT_SSL_VERIFYPEER(3),  CURLOPT_PROXY_SSL_VERIFYPEER(3),
       CURLOPT_PROXY_SSL_VERIFYHOST(3),  CURLOPT_CAINFO(3),
       CURLOPT_CAPATH(3),

ibcurl 8.1.2                    April 26, 2023   CURLOPT_DOH_SSL_VERIFYPEER(3)

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