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# Part III : Deploying for Single Sign-On in a Kerberos Environment

## Exercise 6: Deploying for Single Sign-On

### Goal of this exercise

The goal of this exercise is to learn how to configure a JAAS application that uses Kerberos for authentication to achieve single sign-on. Single sign-on means that the user needs only authenticate once to a system or a collection of services. After the initial authentication, the user can access other services in the system using the same identity as he used for the initial authentication.

Single sign-on can be used to describe different types of authentication. There are HTTP-based network single sign-on protocols. There is Kerberos-based single sign-on for network services. In this particular exercise, we show how to achieve single sign-on in Kerberos-based systems by showing how to import already-acquired Kerberos credentials from the underlying native operating system.

### Background and Resources for this exercise

Single Sign-On Using Kerberos in Java

In addition, see the information provided in Exercise 2 and Exercise 4 for background information about Kerberos and Java GSS.

### Steps to follow

1. Edit the `jaas-krb5.conf` configuration file.

   This file contains two entries: one named client and one named server. Add the line `useTicketCache=true` to the `client` entry.

2. Perform Kerberos login to the native operating system. To login to Kerberos, use `kinit` command as follows:

       % kinit test

   Provide a secure password.

3. Run the client and server programs in Exercises 1 through 5 and you will note that the client applications no longer ask you to enter a password.

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