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If you remove integrated Windows authentication from your virtual directory, you won t be able to debug your web application. That s because Visual Studio .NET uses this protocol to authenticate you when you compile and run an application in the development environment.

Once you ve configured IIS, the authentication process happens automatically. However, if you want to be able to access the identity information for the authenticated user, you need to configure the web.config file to use Windows authentication, as shown here:

<configuration> <system.web> <!-- Other settings omitted. --> <authentication mode="Windows"/> </system.web> </configuration> This tells ASP.NET that you want to use the Windows authentication module. The WindowsAuthenticationModule HTTP module will then handle the Application_AuthenticateRequest event.

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As described earlier, you can force users to log on by modifying IIS virtual directory settings or by using authorization rules in the web.config file. The second approach is generally preferred. Not only does it give you more flexibility, but it also makes it easier to verify and modify authorization rules after the application is deployed to a production web server. 23 describes authorization in detail. For now, you ll consider only the simple technique of denying access to all unauthenticated users. To do this, you must use the <authorization> element of the web.config file to add a new authorization rule, as follows: <configuration> <system.web> <!-- Other settings omitted. --> <authorization> <deny users=" " /> </authorization> </system.web> </configuration> The question mark ( ) is a wildcard character that matches all anonymous users. By including this rule in your web.config file, you specify that anonymous users are not allowed. Every user must be authenticated using one of the configured Windows authentication protocols.

One of the nice things about Windows authentication is that no login page is required. When the user requests a page that requires authentication, the browser transmits the credentials to IIS. Your web application can then retrieve information directly from the User property of the web page. Here s an example that displays the currently authenticated user: if (Request.IsAuthenticated) { // Display generic identity information. lblInfo.Text = "<b>Name: </b>" + User.Identity.Name; lblInfo.Text += "<br><b>Authenticated With: </b>"; lblInfo.Text += User.Identity.AuthenticationType; } This is the same code you can use to get information about the current identity when using forms authentication. However, you ll notice one slight difference. The user name is always in the form DomainName\UserName or ComputerName\UserName. Figure 22-7 shows an example with a user account named Matthew on the computer FARIAMAT.

As you ve learned in the past two chapters, the User property returns an IPrincipal object. When you use Windows authentication, this is an instance of the WindowsPrincipal class. The WindowsPrincipal class provides access to a WindowsIdentity object through the Identity property. The WindowsPrincipal class implements three overloads of IsInRole() that all check whether the user is in a specified Windows user group. The required IsInRole(string) overload is implemented so that it accepts the name of the user group to be checked. IsInRole(int) expects an integer RID (role identifier) that refers to a user group. Finally, an overload is provided that expects a member of the WindowsBuiltInRole enumeration, which provides a list of predefined Windows account types (such as Guest, Administrator, and so on). You can find the WindowsPrincipal, WindowsIdentity, and WindowsBuiltInRole types in the System.Security.Principal namespace. Here s a simple example that tests whether the user is in a predefined Windows role: if (Request.IsAuthenticated) { lblInfo.Text = "<b>Name: </b>" + User.Identity.Name; WindowsIdentity principal = (WindowsPrincipal)User; lblInfo.Text += "<br><b>Power user </b>"; lblInfo.Text += principal.IsInRole( WindowsBuiltInRole.PowerUser).ToString(); } Note that you must cast the User object to a WindowsPrincipal in order to access this Windowsspecific functionality. Figure 22-8 shows the result.

Table 21-1 lists all the possible roles provided through the WindowsBuiltInRole enumeration. You can also test for membership with any arbitrary group you ve created. 23 discusses this technique. Table 21-1. Values for the WindowsBuiltInRole Enumeration

When writing strings out to JavaScript, whether in source code or in a response code in JavaScript Object Notation (JSON),2 there are certain considerations that have to be taken into account for special characters. This function properly escapes these special characters, including Unicode characters, in a way that JavaScript can understand.

AccountOperator Administrator BackupOperator Guest PowerUser PrintOperator Replicator SystemOperator User

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