I have two usecases for a webapp:
a) The web.xml defines zero security constraints, implying the webapp is 
totally insecure.
b) The web.xml secures a portion of the webapp. There is a subset of the webapp 
that represents unsecured resources.

In case a), there is little we can do. No identity(authentication) is 
established and jacc delegation for authorization is meaningless.

In case b), I am guessing that a jacc delegation for both the secure and 
unsecured resources should be possible (from a perspective of current 
tomcat/jboss implementation) to delegate to a jacc provider (via some config 
asking for delegation for unsecured resources).

A boundary case is:
c) Identity of the user is established by some other means - sso, federation 
etc.  If the webapp is totally insecure (zero security constraints), should we 
delegate to jacc (now that the identity of the caller has been established and 
the jacc provider may need to authorize, irrespective of whether the web.xml 
defines security constraints)???

Is my understanding right?

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