ISPermission

com.sun.identity.policy.jaas.ISPermission extends java.security.Permission, an abstract class for representing access to a resource. It represents the control of a sensitive operation, such as opening of a socket or accessing a file for a read or write operation. It does not grant permission for that operation, leaving that responsibility to the JAAS AccessController class which evaluates OpenSSO Enterprise policy against the Policy Service.

ISPermission covers the case when additional policy services are defined and imported provided they only have boolean action values as a JAAS permission only has a boolean result.