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Some components communicate without the need for authentication. This is because the communication is based on a preestablished trust mechanism. A protection domain is the name given to a group of components that have this trust established. Components within the same protection domain do not need to be authenticated with each other, and consequently no constraint is placed on the identity associated during a call. Authentication is required only for components that interact across the boundary of the protection domain. Figure 10-1 illustrates the authentication requirements for interactions that are contained within and that cross the boundary of a protection domain. The container in the JEE environment provides the authentication boundary between external and internal components. It is possible that the authentication boundary is not synchronized with the boundaries of protection domains. Even though it is the responsibility of the container to enforce the boundaries, you may encounter an environment that contains protection domains that span multiple containers. The issue of protection boundaries is extremely important, as enterprise requirements fuse JEE web and EJB components with back-end EIS resources that have preexisting application security in place for example, IBM RACF (Resource Access Control Facility) security for CICS (Customer Information Control System) transactions interacting with JEE. In general, it is the responsibility of the container to authenticate component calls and police the boundaries of the protection domain. On an inbound call, the container passes the authenticated credentials to the component being called. The credentials can be a simple identity or a more complicated item such as an X.509 certificate. Similarly, when a component makes an outbound call, the container is responsible for establishing the identity of the component making the call. When a call is made across containers and the identity of the calling component has not been authenticated, the containers will check whether an existing trust exists between the interacting containers. If the trust exists, the call is permitted; if not, the call is rejected.
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It is important that you differentiate the identity propagation model from the delegation/impersonation model. In the propagation model, the providers must determine whether or not to accept propagated identities as authentic. In delegation/ propagation, the called component is given access to the caller s authentication context, thus enabling the called component to use the passed credentials to act on behalf of (or to impersonate) the caller.
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In a JEE application, the user s client container communicates with containers in the web, EJB, or EIS layers to access resources in their respective zones. These resources can be either protected or unprotected. A resource is protected when an authorization constraint is defined to the container that hosts it. When a user wishes to access a protected resource, the client container must present credentials (along with, when no trust exists between the containers, an authenticator that proves the caller has a right to use the identity) so that the container can validate them against the defined authorization constraint and then either permit or deny access to the resource.
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Collections of web resources, such as JSPs, servlets, HTML documents, image files, and compressed archives, are protected in the JEE environment when the deployer specifies one or more authorization constraints for the collection at deployment time. In the deployed or target environment, when a user of a browser attempts to access protected resources, the web container determines whether the user has been authenticated; if not, the user will be prompted to identify himself using the mechanism specified in the application s deployment descriptor. When the user is successfully authenticated, he still will not be able to access the resource unless his identity is one that is granted permission according to the authorization constraint. As already mentioned, the deployer specifies the authentication mechanism in the application deployment descriptor. A JEE web container typically supports the following types of authentication mechanisms:
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