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ASP .NET implements the concept of gatekeepers (introduced previously) through HTTP modules. Each module is a class implementing the interface IHttpModule, and each module acts as a gatekeeper of the ASP.NET infrastructure. Of course, HTTP modules are used for other tasks, but lots of them are security related. As you can see in Figure 19-9, ASP .NET includes several authentication and authorization modules. Because web applications use the stateless HTTP, no information is retained for the user between requests. As a result, the user must be authenticated and authorized at the beginning of each request. ASP.NET handles this by firing global application events. Authentication modules can handle these events to perform user authentication. Not all requests require authentication or authorization. However, the related events always fire. These events are handled by the configured HTTP modules demonstrated in Figure 19-9. Of course, you can handle the events through the global application class as well (these events are defined in the code-behind class of the Global.asax file), but for higher reusability we recommend creating separate HTTP modules, because it is really easy to create them.

Installs some common tables and stored procedures necessary for both the membership and roles APIs. This includes tables for identifying ASP.NET applications that use other ASP.NET features such as the membership API, role service, or personalization. Installs the database tables, stored procedures, and triggers used by the membership API. This includes tables for users, additional user properties, and stored procedures for accessing this information. Installs all database tables and stored procedures required for associating users with application roles. These roles will be used for authorization, as you will learn in 23. Contains DDL for creating any table and stored procedure required for creating personalized portal applications with web parts. Creates all the necessary tables and stored procedures for supporting ASP.NET 2.0 user profiles.

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When using forms authentication, you have the choice of where to store credentials for the users. You can store them in a custom file or in a database; basically, you can store them anywhere you want if you provide the code for validating the user name and password entered by the user with the values stored in your credential store. The easiest place to store credentials is directly in the web.config file through the <credentials /> subelement of the <forms /> configuration tag introduced previously. <authentication mode="Forms"> <!-- Detailed configuration options --> <forms name="MyCookieName" loginUrl="MyLogin.aspx" timeout="20"> <credentials passwordFormat="Clear"> <user name="Admin" password="(Admin1)"/> <user name="Mario" password="Szpuszta"/> <user name="Matthew" password="MacDonald"/> </credentials> </forms> </authentication>

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.

Installs tables for persistent session state in the TEMP database of SQL Server. That means every time the SQL Server service is shut down, the session state gets lost. Installs tables for persistent session state in a separate ASPState database. That means the state stays alive even if the SQL Server service gets restarted.

First, using web.config as a credential store is possible for simple solutions with just a few users only. In larger scenarios, you should use the Membership API, which is described in 21. Second, you can hash password values for credentials stored in the web.config file. Hashing is nothing more than applying one-way encryption to the password. This means the password will be encrypted in a way that it can t be decrypted anymore. You will learn how you can hash passwords correctly when creating a custom Membership provider in 26.

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.

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