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One of the nice features of Windows authentication is that no login page is required. Once you enable it in IIS and deny anonymous users in your web.config file, IIS springs into action. Depending on the authentication protocol you re using, the login process may take place automatically or the browser may show a login dialog box. Either way, you don t need to perform any additional work. You can retrieve information about the currently logged-on user from the User object. As you learned earlier, the User object provides identity information through the User.Identity property. Depending on the type of authentication, a different identity object is used, and each identity object can provide customized information. To get some additional information about the identity of the user who has logged in with Windows authentication, you can convert the generic IIdentity object to a WindowsIdentity object (which is defined in the System.Security.Principal namespace). The following is a sample test page that uses Windows authentication (see Figure 20-12). To use this code as written, you need to import the System.Security.Principal namespace (where the WindowsIdentity class is defined). Public Partial Class SecuredPage Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load Dim displayText As New StringBuilder() displayText.Append("You have reached the secured page, ") displayText.Append(User.Identity.Name)

The Events controller will contain all the actions for the Calendar plugin since the plugin itself is going to be fairly basic. To get this controller working inside the plugin, you must extend the Calendar App controller and provide actions to perform the plugin s logic. Listing 13-8 contains the initial content of the Events controller. Write this code to a new file called app/ plugins/calendar/controllers/events_controller.php.

Dim winIdentity As WindowsIdentity winIdentity = CType(User.Identity, WindowsIdentity) displayText.Append(".<br /><br />Authentication Type: ") displayText.Append(winIdentity.AuthenticationType) displayText.Append("<br />Anonymous: ") displayText.Append(winIdentity.IsAnonymous) displayText.Append("<br />Authenticated: ") displayText.Append(winIdentity.IsAuthenticated) displayText.Append("<br />Guest: ") displayText.Append(winIdentity.IsGuest) displayText.Append("<br />System: ") displayText.Append(winIdentity.IsSystem) displayText.Append("<br />Administrator: ") displayText.Append(User.IsInRole("BUILTIN\Administrators")) lblMessage.Text = displayText.ToString() End Sub End Class

In ASP.NET, all code runs under a carefully limited account. In Windows XP, this is typically an account that ASP.NET creates automatically, which is named ASPNET. In Windows Server 2003, Windows Vista, and Windows Server 2008, ASP.NET uses the network service account instead. The account that ASP.NET uses determines what Windows will allow your application to do. As you ve already learned earlier in this book, this account needs to be able to access the databases you want to use, the files you want to change, and so on. From a security standpoint,

this design makes sense, because it limits what your application can do if it s tricked into performing the wrong action or compromised in some way. Obviously, the permissions that are given to the ASP.NET account do not match the permissions that you want your users to have. For example, the ASP.NET account is allowed to perform tasks that the application users are not, like compile code. Furthermore, the ASP.NET account usually has the free run of any databases and files you use, whereas individual users are only allowed to see some of the information inside. Because of this mismatch of permissions, you need to write security checks in your code. For example, if the user goes to the current account page, your code makes sure the user only sees the information for their account, and only sees that if they re properly logged in. In some cases, you might want your ASP.NET application to temporarily assume the permissions of the ASP.NET user. This process, whereby a portion of your code runs under a different Windows account, with a different set of Windows permissions, is called impersonation.

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With impersonation, your ASPNET code interacts with the system under the identity of the authenticated user not the normal ASPNET account This changes the equation of what your website code is allowed to do For example, if you try to perform a database operation, Windows will now evaluate whether that specific Windows user is allowed to access the database Impersonation is useful when you don t want to worry about authorization details in your code For example, imagine you have a simple application that lets users upload, view, and manage some personal files on the web server Each user has a separate folder to store files, and each folder has a different set of Windows permissions that allow the appropriate user and restrict everyone else Now, imagine you build an ASPNET web page that lets users browse and view these files.