Hi hlsun,
as it is reported in this answer https://www.knowage-suite.com/qa/6690/knowage-single-sign-on-sso-login the Knowage CAS engine is deprecated.
I suggest you to evaluate other mechanism such as the built-in SSO system, or Google/Azure connectors.
If you still want to use CAS, please refer to the official .war files
Hope this helps,Bye,Marco