Documentation
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CAS
Set this to true to enable CAS single sign on. NTLM will work only if LDAP authentication is also enabled and the authentication is made by screen name. If set to true, then the property auto.login.hooks must contain a reference to the class com.liferay.portal.security.auth.CASAutoLogin and the filter com.liferay.portal.servlet.filters.sso.cas.CASFilter must be referenced in web.xml.
cas.auth.enabled=false
A user may be authenticated from CAS and not yet exist in the portal. Set this to true to automatically import users from LDAP if they do not exist in the portal.
cas.import.from.ldap=false
Set the default values for the required CAS URLs. Set either cas.server.name or cas.service.url. Setting cas.server.name allows deep linking. See http://issues.liferay.com/browse/LEP-4423.
Examples:
cas.login.url=https://localhost:8443/cas-web/login
cas.logout.url=https://localhost:8443/cas-web/logout
cas.server.name=localhost:8080
cas.server.url=https://localhost:8443/cas-web
cas.service.url=
cas.service.url=http://localhost:8080/c/portal/login
cas.no.such.user.redirect.url=http://localhost:8080
Set this to true to log out the user from CAS when the portal session expires.
cas.logout.on.session.expiration=false