Java Authentication and Authorization Service (JAAS) provides the ability to implement the two things that any decent security system needs: authentication and authorisation. See how JAAS may save you time and effort the next time you need to add security to your Java app.
Balancing openness and security is complicated when you're writing applications that users outside your company's normal network sandbox must be able to access or that access resources needing security protection.
Many Java programmers create their own security modules for their applications. Most of these modules are for a specific application; then, when the next app comes along that needs security, the programmer has to start all over again. Another drawback of building your own security system for your application is that, as the application becomes more complex, the security requirements probably will too.
Java Authentication and Authorization Service
You can avoid this problem (or at least significantly reduce the impact of implementing security for your application) by taking advantage of the Java Authentication and Authorization Service (JAAS) API, which is in the standard Java distribution.
JAAS provides the ability to implement the two things that any decent security system needs: authentication and authorisation.
|> Authentication means verifying a user's identity. There are ways to achieve this by using different mechanisms, including certificates, existing authentication schemes, databases, etc. The authentication section of JAAS is pluggable, so you configure your application at runtime to use the authentication module you desire.
|> The authorisation component of JAAS determines which resources an authenticated user can access. This authorisation scheme is based on roles and principles.
Developers can use JAAS for standalone applications, Web apps, EJBs, and pretty much any type of Java app that you can create. The flexibility and openness of the API can make it a bit difficult to understand at first. But if you're using an application server, it probably already has JAAS modules that you can use to manage your application's security.
The next time you need security in your application, consider whether JAAS can save you time and effort. If you're already using a J2EE or servlet container, check out its JAAS capabilities. Even though JAAS has a steep learning curve, it's also a very short one, and the benefits are definitely worth the effort it takes to get started.
This was published in 
