Unknown SSL protocol error in connection to graph.facebook.com:443

Problem/Motivation

With an OAauth provider added from the Facebook preset, you get the following error when trying to use it:

Unknown SSL protocol error in connection to graph.facebook.com:443

I am using PHP 5.3.10 and curl 7.24.0.

As described on stackoverflow, this error stems from a timeout, because curl tries to verify the SSL certificate of the server it is connecting to. This seems to be the default as of cURL 7.10, see the PHP manual: http://php.net/manual/en/function.curl-setopt.php

Proposed resolution

In DrupalOAuth2Client.inc set the following option:

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);

Patch follows in a sec.