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As you will see in 20, when using forms authentication, you need to authenticate your users against a custom store. This means you must do much more than create a basic login page for validating user names and passwords. Of course, you need a way to manage users as well as assign users to roles. With ASP.NET 1.x you had to create such management tools and components for programmatic management on your own. ASP.NET 2.0 provides this infrastructure through the membership API, the roles API, and the profiles API.

To download the ASP.NET Development Helper, surf to http://www.nikhilk.net/ Project.WebDevHelper.aspx. There you can download two DLLs, one for the HTTP module (WebDevInfo.dll) and one for the browser plug-in (WebDevInfo.BHO.dll). Copy these to any directory. Then, install the browser extension with the following command line: regsvr32 nStuff.WebDevInfo.BHO.dll Next, you need install the assembly for the HTTP module into the GAC. You can do this by dragging and dropping in Windows Explorer, but it s generally easier to use the gacutil.exe utility. Start a Visual Studio command prompt (choose Programs Visual Studio 2005 Visual Studio Tools Visual Studio 2005 Command Prompt from the Start menu), and then run this command: gacutil /i nStuff.WebDevInfo.dll Now, when you want to use this tool with a web application, you need to modify the web.config file so it loads the HTTP module. The content you need depends on the exact version of the tool you re using, but it looks something like this: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <httpModules> <add name="DevInfo" type="nStuff.WebDevInfo.DevInfoModule, nStuff.WebDevInfo, Version=0.5.0.0, Culture=neutral, PublicKeyToken=8fc0e3af5abcb6c4" /> </httpModules> ... </system.web> </configuration> Now, run one of the pages from this application. To actually call up the browser plug-in, look for a button (with a gear icon) in the browser, which will have been added to the end of the Standard toolbar. When you click this icon, you ll see a display like the one shown in Figure 2-34 (assuming you re currently viewing an ASP.NET page from an application that has the matching HTTP module loaded). You ll see the ASP.NET Developer Helper at work in 3.

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While Basic authentication transmits the information through the HTTP header, Windows authentication uses either NTLM or Kerberos for transmitting the information..

The membership API is a complete user management system. It helps you create, edit, and delete users, and it includes functionality for password recovery. You can use the API for programmatically performing all these management tasks, or you can use the ASP.NET web configuration tool for the graphical administration of your users. With this infrastructure you can save lots of time, as you don t have to create your own user administration application anymore because it already exists within the ASP.NET 2.0 framework. Furthermore, it includes functionality for validating a user name and password combination entered by the user. You will learn more details about the membership API in 21.

Summary

Figure 19-4. IIS authentication options Digest authentication is similar to Basic authentication. Instead of sending the credentials Base64 encoded across the wire, it hashes the user s password and transmits the hashed version across the wire. Although this sounds more secure, Digest authentication has never become common. As a result, it s rarely used outside of controlled environments (such as intranets). Passport authentication uses Microsoft Passport as its underlying infrastructure. Microsoft Passport implements a central identity management. In that case, the user s credentials are managed by a separate Passport server. While usually this infrastructure is hosted by Microsoft, you can also host your own Passport infrastructure within your company and use that instead. Finally, IIS supports one additional authentication method, certificate authentication, that cannot be found in Figure 19-3, as it is configured through SSL.

In many cases authorization is performed on groups of users called roles. One role can contain many users, and a user can be assigned to many roles. ASP.NET 2.0 includes a ready-to-use API that allows you to assign users to roles as needed. Again, you can do this programmatically through the roles API or with the ASP.NET web configuration utility. In 23, you will learn about the details of using the roles API in your applications.

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