NAME

       CURLOPT_SSL_OPTIONS - set SSL behavior options

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_OPTIONS, long bitmask);

DESCRIPTION

       Pass a long with a bitmask to tell libcurl about specific SSL behaviors.

       CURLSSLOPT_ALLOW_BEAST  tells  libcurl  to  not attempt to use any workarounds for a security flaw in the
       SSL3 and TLS1.0 protocols.  If this option isn't used or this bit is set to 0, the SSL layer libcurl uses
       may use a work-around for this flaw although it might cause interoperability problems with  some  (older)
       SSL  implementations. WARNING: avoiding this work-around lessens the security, and by setting this option
       to 1 you ask for exactly that.  This option is only supported for DarwinSSL, NSS and OpenSSL.

       Added in 7.44.0:

       CURLSSLOPT_NO_REVOKE tells libcurl to disable certificate revocation checks for those SSL backends  where
       such  behavior  is  present.  Currently  this option is only supported for WinSSL (the native Windows SSL
       library), with an exception in the case of Windows' Untrusted Publishers blacklist which it  seems  can't
       be  bypassed.  This  option  may  have  broader  support to accommodate other SSL backends in the future.
       https://curl.haxx.se/docs/ssl-compared.html

DEFAULT

       0

PROTOCOLS

       All TLS-based protocols

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
         /* weaken TLS only for use with silly servers */
         curl_easy_setopt(curl, CURLOPT_SSL_OPTIONS, CURLSSLOPT_ALLOW_BEAST |
                          CURLSSLOPT_NO_REVOKE);
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY

       Added in 7.25.0

RETURN VALUE

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

SEE ALSO

       CURLOPT_SSLVERSION(3), CURLOPT_SSL_CIPHER_LIST(3),

libcurl 7.58.0                                    May 31, 2017                            CURLOPT_SSL_OPTIONS(3)