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In this chapter, you learned about the Membership API, which is new in ASP.NET 2.0. The Membership API provides you with a full-fledged infrastructure for managing users of your application. You can use either the WAT, the new security controls, or the Membership API for accessing these base services. Membership itself is provider based. In other words, you can exchange the underlying store by changing the underlying provider without touching your application. In this chapter you used only SQL Server as a provider. In 26 you will learn the necessary details for creating and configuring a custom Membership provider. In the next chapter, you ll look at a different approach of validating user identity Windows authentication.

orms authentication is a great approach if you want to roll your own authentication system using a back-end database and a custom login page. But what if you are creating a web application for a smaller set of known users who already have Windows user accounts In these situations, it makes sense to use an authentication system that can leverage the existing user and group membership information. The solution is Windows authentication, which matches web users to Windows user accounts that are defined on the local computer or another domain on the network. In this chapter, you ll learn how to use Windows authentication in your web applications. You ll also learn how to apply impersonation to temporarily assume another identity.

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Unlike forms authentication, Windows authentication isn t built into ASP.NET. Instead, Windows authentication hands over responsibility of authentication to IIS. IIS asks the browser to authenticate itself by providing credentials that map to a Windows user account. If the user is successfully authenticated, IIS allows the web-page request and passes the user and role information onto ASP .NET so that your code can act on it in much the same way that it works with identity information in a forms authentication scenario. Figure 22-1 shows the end-to-end flow.

When retrieving objects from the database, it s often expected that exactly one row will be returned. This is always the case whenever the query is a primary key but slugs and perhaps even dates can be made unique in certain applications. Django supports this situation with a QuerySet s method, and if it matches more than one result, it can throw off the whole execution of the application.

You would want to use Windows authentication for three main reasons: It involves little programming work on the developer s part. It allows you to use existing user logins. It allows you to use impersonation and Windows security. The first reason is quite simple using Windows authentication allows IIS and the client browser to take care of the authentication process so you don t need to create a login page, check a database, or write any custom code. Similarly, Windows already supports basic user account features such as password expiry, account lockout, and group membership. The second, and most important, reason for using Windows authentication is that it allows you to leverage existing Windows accounts. Typically, you use Windows authentication for applications where the users are part of the same local network or intranet as your web server. That means you can authenticate users with the same credentials they use to log into their computers. Best of all, depending on the settings you use and the network architecture, you may be able to provide invisible authentication that works without forcing a separate login step. Instead, the browser simply uses the logged-in identity of the current user.

Figure 22-1. The Windows authentication process The third reason you might want to use Windows authentication is that it allows you to take advantage of existing Windows security settings. For example, you can control access to files by setting Windows file-access permissions. However, it s important to remember that these permissions don t take effect automatically. That s because by default your web application runs using a fixed account (typically ASPNET, as defined in the machine.config file). You can change this behavior by carefully using Windows authentication and impersonation, as described in the Impersonation and Delegation on Windows Server 2003 section of this chapter.

So, why would you not want to use Windows authentication It s tied to Windows users. It s tied to Windows client machines. It doesn t provide much flexibility or control and can t be customized easily.

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