Apache Shiro is a Java security framework and support SSO. And I have multiple sub-domains, each of which has separate application running. How can I use Apache Shiro web fi
For Shiro to support SSO, Cas is now deprecated, you need to use buji-pac4j library to support SSO using multiple protocols like SAML, OpenIdConnect, etc.
I am not Shiro expert, but I will try to help you.
According to my understanding Shiro does not provide SSO service out of the box. You need to use CAS filter as SSO service. Please look the following page that explain you how to define Shiro CasFilter: http://shiro.apache.org/cas.html