Yes, Possible.
CAS configurations are in two section:
- CAS configuration files inside /opt/tomcat/webapps/cas/ ( inside Gluu Server container )
- Inside LDAP: 'ou=oxcas,ou=configuration,inum=@abcd....,ou=appliances,o=gluu'
However as Gluu Server is unified login ( CAS/SAML/OpenID Connect ) and there is no out of the box radius script in community edition; so you can write a [custom authentication interception script](https://gluu.org/docs/customize/script/) that uses a RADIUS API in python or Java.