Nagios Login type switch from SiteMinder to CAS

Can anyone help me switch my login type from SiteMinder to CAS?
I am not sure what do i need to do , what and where are the scripts located for this kind of issues and how to resolve it.

What is the connection to Nagios, if I may ask? Siteminder is a CA product, and CAS… Well, that 3-letter abbreviation seems to have many meanings… 8)

Central Authentication Services …i want to login to my nagios throught cas.ABC.XYZ/

and there are some integrations available in jasig.org —under CAS and other clients

however since my all nagios files are not all php or not all perl, it’s hard to find any environment variable that could easily replace siteminder to CAS.