We need to monitor websites that are protected by client certificates. So i created an prof of concept patch to enable the libcurl client certficate support.
Take a look at: https://www.zabbix.com/forum/showthread.php?t=38625
this is a quick and dirty patch/hack to monitor client certificate protected websites. This patch is against Zabbix 2.0.4.
The cert files have to be in PEM format. You need an file for the CA, the client certifcate, the private key and the password for this private key.
This was my example code for libcurl SSL support: http://curl.haxx.se/libcurl/c/simplessl.html
With the curl cmd tool and an .curlrc file it's possible to test the PEM files:
I hope this patch is useful for someone.