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The overall remoting architecture is shown in Figure 11-1.

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Authentication is the process of establishing a user s identity, whereas authorization is the process of granting and denying access to appropriate parts of an application based on that identity This chapter has discussed authentication, but only our coverage of roles has touched on authorization When working with a self-contained portlet, you will be able to work directly with the roles provided by the isUserInRole() method, but interfacing with external systems for SSO you may be obliged to acquire role memberships from elsewhere Generally speaking, role memberships or security group memberships will be listed in a directory service A directory is a hierarchical database Given an appropriate set of keys, you can interrogate it for an associated set of values The set of keys is usually termed a path A typical scenario might map the key /system/ security/users/dave to the values Manager and User .

Figure 11-1. Remoting architecture Every .NET application has a security and isolation boundary. Traditionally, this boundary is provided by the operating system in the form of a process. In the .NET Framework, however, this boundary is provided by the Common Language Runtime (CLR) and is called the application domain, or app domain for short. Two .NET app domains (or applications) cannot talk to each other directly for the sake of obvious security and isolation reasons. If you wish to communicate between two app domains, you need a proxy and marshalling infrastructure.

A directory service that is not directly related to security is the Directory Naming Service (DNS) used to translate names such as examplecom to IP addresses like 192034166 is a directory service In fact, examplecom is a path, but in DNS the keys are separated by dots instead of slashes Java provides an API for accessing directory services called Java Native Directory Interface (JNDI) This permits you to access different services using a standardized API, so it is a simple matter to acquire the role memberships from an appropriate directory server Probably the most popular directory protocol is Lightweight Directory Access Protocol (LDAP) Among the most common proprietary directory service implementations, Microsoft s Active Directory authentication and authorization servers can be accessed via the LDAP protocol Free versions are also available, such as the offering from the OpenLDAP Foundation (wwwopenldapcom).

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Microsoft s Active Directory can be accessed as a Kerberos server for pure authentication, but its implementation includes a proprietary extension that incorporates role (authorization) information into the security tickets..

Fortunately, the .NET Framework provides all the necessary infrastructure to achieve this communication. Figure 11-1 shows a remote object being consumed by a client application. The client application is loaded in its own app domain. Similarly, the server object is loaded in its own app domain. Before the remote object (often called a server) can be consumed, it must be activated on the server. Activation is a process by which the remote object is published and made available on a network, and the remoting infrastructure must be present at both ends of the .NET Framework. When the client wishes to call any method of the remote object, it does so via a proxy. The proxy marshals the method call to the remote server. The remote object then executes it and marshals the return value back. Again, the proxy acts as a middleman and conveys the results back to the client application. The data marshalled from one application to the other is transferred over a communication channel. Typically this channel will be TCP or HTTP.