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The approach necessitates management of the passwords for the systems. Different legacy systems may require password changes at different times. Users will still have to remember (or, dangerously, write down) the individual passwords so that they can change them when they expire, or alternatively the passwords will need to be set not to expire at all, which is in itself a security risk. For seamless integration, the proxy SSO server would need to manage the life cycle for each username and password pair. If the proxy SSO server had rules for each legacy system that dictated the password expiration, the range of valid password values, and the ability to change passwords, this could all be managed for the user. The integration development costs for a project like this would be very high. Because the passwords must be retrieved in order to present them to the legacy systems, they must be stored by the proxy SSO solution in an encrypted form that decrypts to plaintext. This is generally considered undesirable. More desirable would be a solution that stores a message digest or hash of the password, so the original password cannot be reconstructed.

The common registry approach is something of a compromise between the true and proxy SSO solutions. While it does not require full implementation of a GSS-API compliant system, it does require some changes to any legacy systems involved. The idea is that a central system is used to carry out all authentication, but that users are prompted for usernames and passwords each time they access a different system. However, subsequent access to the same systems within the login session does not require reauthentication. Perhaps the term Single Sign-On is a misnomer here, since of course the user is making multiple login efforts, but because a single username and password combination is required, far less is required of the user. In practice this is often a satisfactory solution, and it has the advantage that it is compatible with a migration to the True SSO solution as the legacy systems are retired. In a portlet environment, the attraction of this approach is less obvious, since it is possible that users would be initially presented with a great number of portlets on their home page, each and every one of which could initially demand a username and password before they can be used!

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An alternative transaction-management strategy is to use a JTA transaction manager. All application servers come with such a transaction manager, although some stand-alone implementations exist. You don t automatically need to use JTA when deploying applications in an application server. Nothing stops you from using DataSourceTransactionManager, which gives you the advantage of more independence from the deployment environment. However, in a minority of cases, you want to delegate transaction management to the JTA transaction manager of your application server. The most common reason for this is to work with distributed transactions.

We have encountered a small part of the Java Authentication and Authorization Services ( JAAS) in our coverage of the Principal object returned by the getUserPrincipal() method of the PortletRequest object.

The storage space used by WordPress, your images, your download files, and so on The space taken by your database holding your posts, comments, links, and so on (this is sometimes counted separately from your main storage) The bandwidth used each month by your visitors accessing your pages

The portlet generally obtains a principal in this manner, so you can get by without knowing how to do this manually. However, it is enlightening to see the mechanism used in practice, and in some SSO scenarios especially the proxy scenario it can be necessary. At the point that you conduct a login, some details of the login mechanism must be known. You cannot generally log in to a Unix system using NTLM (Microsoft) authentication, and most authentication systems provide no discovery mechanism to determine the protocol in use. JAAS is therefore based on an API called Pluggable Authentication Modules (PAM), which allows you to try a login on a system or systems using a variety of different protocols. As a result, you can conduct a JAAS login, at the end of which one or more systems may have vouched for your credentials. The protocols to be used are generally specified using a configuration file. This can contain individual or multiple entries.

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