[Koha] Koha is not authorized to use CAS

[Ahmed Hadzic]

Hi everyone,
I'm trying to implement KOHA library to my university. I' using KOHA 3.18 
and Ubuntu server 14.04 TLS. I followed instructions on how to install 
KOHA from here 
http://wiki.koha-community.org/wiki/Koha_on_ubuntu_-_packages

I needed to do SSO with CAS (4.0.0). So far, I managed to login to CAS as 
default CAS user. When I try to login as patron I get the error 
'The application you attempted to authenticate is not authorized to use 
CAS'. I would like to know how to authenticate KOHA with CAS, how to login 
to CAS as Koha patron. I would appreciate any help

Kind regards,
Ahmed