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Forms authentication is a ticket-based (also called token-based) system. This means when users log in, they receive a ticket with basic user information. This information is stored in an encrypted cookie that s attached to the response so it s automatically submitted on each subsequent request. When a user requests an ASP.NET page that is not available for anonymous users, the ASP.NET runtime verifies whether the forms authentication ticket is available. If it s not available, ASP .NET automatically redirects the user to a login page. At that moment, it s your turn. You have to create this login page and validate the credentials within this login page. If the user is successfully validated, you just tell the ASP.NET infrastructure about the success (by calling a method of the FormsAuthentication class), and the runtime automatically sets the authentication cookie (which actually contains the ticket) and redirects the user to the originally requested page. With this request, the runtime detects that the authentication cookie with the ticket is available and grants access to the page. You can see this process in Figure 20-1.

Remember that the methods of FormsAuthentication are Shared, so you do not need to create an instance of FormsAuthentication to use them you simply access them through the name of the class If FormsAuthenticationAuthenticate(UsernameTextText, PasswordTextText) Then .. End If If a match is found for the supplied credentials, you can use the RedirectFromLoginPage() method, as shown here: FormsAuthenticationRedirectFromLoginPage(UsernameTextText, False) This method performs several tasks at once: 1 It creates an authentication ticket for the user 2 It encrypts the information from the authentication ticket 3 It creates a cookie to persist the encrypted ticket information 4 It adds the cookie to the HTTP response, sending it to the client 5 It redirects the user to the originally requested page (which is contained in the query string parameter of the login page request s URL).

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As mentioned previously, you might want to use encryption in a web application for two reasons: To protect communication (data over the wire): For example, you might want to make sure an eavesdropper on the public Internet can t read a credit card number that s used to purchase an item on your e-commerce site The industry-standard approach to this problem is to use SSL SSL also implements digital signatures for ensuring integrity SSL isn t implemented by ASP NET Instead, it s a feature provided by IIS Your web-page (or web service) code is identical whether or not SSL is used To protect permanent information (data in a database or in a file): For example, you might want to store a user credit card in a database record for future use.

The second parameter of RedirectFromLoginPage() indicates whether a persistent cookie should be created Persistent cookies are stored on the user s hard drive and can be reused for later visits Persistent cookies are described in the section Persistent Cookies in Forms Authentication later in this chapter Finally, if Authenticate() returns False, an error message is displayed on the page Feedback such as this is always useful However, make sure it doesn t compromise your security For example, it s all too common for developers to create login pages that provide separate error messages depending.

If you want to accomplish a certain UI effect, you might handle rapid events such as mouse movements with client-side JavaScript. (Or, better yet, you might use a custom ASP.NET control that already has these smarts built-in.) However, all your business code must execute in the secure, feature-rich server environment.

Although you could store this data in plain text and assume the web server won t be compromised, this is never a good idea Instead, you should use the encryption classes that are provided with NET to manually encrypt data before you store it It s worth noting that the NET encryption classes aren t directly tied to ASPNET In fact, you can use them in any type of NET application You ll learn about encryption and digital signatures as well as how to take control of custom encryption in 25..

on whether the user has entered a user name that isn t recognized or a correct user name with the wrong password. This is usually not a good idea. If a malicious user is trying to guess a user name and password, the user s chances increase considerably if your application gives this sort of specific feedback.

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