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Mostly you will use the FormsAuthentication class and the FormsIdentity class, which represents a successfully authenticated user in your application. Next you will learn how to use forms authentication in your application.

Summary

Figure 19-9. The ASP .NET security gatekeepers as IHttpModule classes The two primary events you need to deal with are the AuthenticateRequest and AuthorizeRequest events. These aren t the only events that fire, but these are the most useful. Figure 19-10 shows the order of security-related application events.

Basically, you need to complete the following steps to use forms authentication in your application: 1. Configure forms authentication in the web.config file. 2. Configure IIS to allow anonymous access to the virtual directory, and configure ASP.NET to restrict anonymous access to the web application. 3. Create a custom login page that collects and validates a user name and password and then interacts with the forms authentication infrastructure for creating the ticket. The following sections describe these steps.

In this chapter, you learned how to configure your web application on the target environment. For this step, IIS the web hosting software included with Windows plays a key role; you saw the different aspects of installing and configuring IIS on Windows 2000/XP and Windows Server 2003 systems.

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Session state is not accessible until after the authorization and authentication events have fired. This prevents you from storing user identity information in session state. Instead, you must use other mechanisms.

The cookie is encrypted with a machine-specific key that s defined in the machine.config file. Usually, this detail isn t important. However, in a web farm you need to make sure all servers use the same key so that one server can decrypt the cookie created by another.

You also learned about the process architecture of IIS 5x and IIS 60, and you learned about the differences between those two architectures While IIS 5x uses a single-process model and ASPNET executes in a separate worker process called aspnet_wpexe for executing managed applications, IIS 60 favors the more secure and reliable worker process model where you can configure as many processes as you want for running your web applications Every worker process is configured through application pools Based on these pools, you can configure recycling settings, performance and health settings, and a custom identity for every process By default each process runs under the restricted Network Service account, but if additional permissions are required, you can configure your own identity Then you learned about how Windows and IIS share web applications through virtual directories.

The AuthenticateRequest event is raised by the HttpApplication object when a request requires authentication. Once the user is authenticated (typically supplying some sort of user credential such as a cookie with user information), the next step is to make sure the user identity information is readily available for the rest of the page-processing cycle. To accomplish this, you must create a new object with user information and attach it to the User property of the current HttpContext. The AuthorizeRequest event is raised after the user has been authenticated in the AuthenticateRequest event. Authorization modules use AuthorizeRequest to check whether the user is authorized for the resource they are requesting.

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