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No support for adding user-specific information: For example, you might want to store information such as addresses, credit cards, personal preferences, and so on. Poor performance with a large number of users: The web.config file is just a file, and it can t provide the efficient caching and multiuser access of a database. Therefore, in most applications you will use your own custom credential store for user name and password combinations, and mostly it will be a database such as SQL Server. In ASP.NET 1.x, you had to implement this scenario on your own. In your login form you then had to connect to the database, verify whether the user exists, compare the password stored in the database to the one entered by the user, and then call FormsAuthentication.RedirectFromLoginPage if the user name and password entered by the user were valid. The following example demonstrates this, and it assumes that you have written a function MyAuthenticate that connects to a SQL Server database and reads the corresponding user entry. It returns True if the entered user name and password match the ones stored in the database. Protected Sub LoginAction_Click(ByVal sender As Object, ByVal e As EventArgs) Page.Validate() If (Not Page.IsValid) Then Exit Sub End If If Me.MyAuthenticate(UsernameText.Text, PasswordText.Text) Then FormsAuthentication.RedirectFromLoginPage(UsernameText.Text, False) Else LegendStatus.Text = "Invalid username or password!" End If End Sub Fortunately, ASP.NET 2.0 provides a ready-to-use infrastructure as well as a complete set of security-related controls that do this for you. The membership API includes a SQL Server based data store for storing users and roles and functions for validating user names and passwords against users of this store without knowing any details about the underlying database, as you will learn in 21. Furthermore, this infrastructure is completely extensible through custom providers, as you will learn in 26.

As previously mentioned, IIS supports several authentication mechanisms Any other configuration setting security (and therefore authentication) is configured on a per-website basis You can find the security settings on the Directory Security tab of a virtual directory s properties Figure 19-4 shows the authentication options of IIS Of course, anonymous access gives everyone access to the web page It overrides any other authentication setting of IIS because IIS authenticates only if it is necessary (and of course if anonymous authentication is enabled, no additional authentication steps are necessary for saving round-trips) Further, if you have configured anonymous authentication in IIS, you still can use ASP NET-based security to authenticate users either with ASPNET-integrated mechanisms such as forms authentication or a custom type of authentication, as you will learn later in this chapter and in subsequent chapters.

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You have the same degree of control over the appearance of forms authentication as you do over its functionality. In other words, you can format the login form in any way you like. This flexibility in appearance is not available in the other authentication methods. Windows authentication needs the browser to collect credentials, and Passport authentication requires that users leave your website and visit the Passport site to enter their credentials.

The examples you ve seen so far have used a nonpersistent authentication cookie to maintain the authentication ticket between requests. This means that if the user closes the browser, the cookie is immediately removed. This is a sensible step that ensures security. It s particularly important with shared computers to prevent another user from using a previous user s ticket. Nonpersistent cookies also make session hijacking attacks (where a malicious user gains access to the network and steals another user s cookie) more difficult and more limited. Despite the increased security risks of using persistent authentication cookies, it is appropriate to use them in certain situations. If you are performing authentication for personalization rather than for controlling access to restricted resources, you may decide that the usability advantages of not requiring users to log in on every visit outweigh the increased danger of unauthorized use. Once you have decided to use persistent cookies, implementing them is easy. You simply need to supply a value of True rather than False for the second parameter of the RedirectFromLoginPage() or SetAuthCookie() method of the FormsAuthentication class. Here s an example: FormsAuthentication.RedirectFromLoginPage(UsernameTextBox.Text,True)

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