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Once you have an account token, you can use the WindowsIdentity.Impersonate() method to start impersonating the corresponding identity. You can use the Impersonate() method in two ways. You can use the static version, which requires an account token. Alternatively, you can use the instance version, which impersonates the identity represented by the corresponding WindowsIdentity object. In either case, the Impersonate() method returns a WindowsImpersonationContext object that has a single function it allows you to revert to the original identity by calling its Undo() method. Here s an example of programmatic impersonation at its simplest, using the static version of the Impersonate() method: WindowsImpersonationContext impersonateContext; impersonateContext = WindowsIdentity.Impersonate(token); // (Now perform tasks under the impersonated ID. // This code will not be able to perform any task // that the user would not be allowed to do.) impersonateContext.Undo()

At any time, you can determine the identity that your code is currently executing under by calling the WindowsIdentity.GetCurrent() method. Here s a function that uses this technique to determine the current identity and display the corresponding user name in a label on a web page: private void DisplayIdentity() { // Get the identity under which the code is currently executing. WindowsIdentity identity = WindowsIdentity.GetCurrent(); lblInfo.Text += "Executing as: " + identity.Name + "<br>"; } Using the method, you can create a simple test that impersonates the authenticated IIS identity and then reverts to the standard identity: private void Page_Load(object sender, System.EventArgs e) { if (User is WindowsPrincipal) { DisplayIdentity(); // Impersonate the IIS identity. WindowsIdentity id; id = (WindowsIdentity)User.Identity; WindowsImpersonationContext impersonateContext; impersonateContext = id.Impersonate(); DisplayIdentity(); // Revert to the original ID as shown here. impersonateContext.Undo(); DisplayIdentity(); } else { // User isn't Windows authenticated. // Throw an error or take other steps. } } Figure 22-18 shows the result.

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Given a long string as its first argument, this function drops all words after the number specified in the second argument, returning the modified string. It preserves punctuation adjacent to words, and automatically adds ellipses after the shortened string before returning it. This is mostly useful for showing brief summaries of content prior to displaying the full text in a separate view.

Summary

In this chapter, you learned how to use Windows authentication with ASP.NET to let IIS validate user identities. You also learned about the different types of authentication, how to retrieve user information, and how to impersonate users so your code runs under a different Windows account. In the next chapter, you ll learn about using advanced authorization rules that apply to Windows authentication and forms authentication.

o far, you ve seen how to confirm that users are who they say they are and how to retrieve information about those authenticated identities. This gives your application the basic ability to distinguish between different users, but it s only a starting point. To create a truly secure web application, you need to act upon that identity at various points using authorization. Authorization is the process of determining whether an authenticated user has sufficient permissions to perform a given action. This action could be requesting a web page, accessing a resource controlled by the operating system (such as a file or database), or performing an application-specific task (such as placing an order or assigning a project). Windows performs some of these checks automatically, and you can code others declaratively using the web.config file. You ll need to perform still others directly in your code using the IPrincipal object. In this chapter, you ll learn how ASP.NET authorization works, how to protect different resources, and how to implement your own role-based security.

The most straightforward way to set security permissions is on individual web pages, web services, and subdirectories. Ideally, a web application framework should support resource-specific authorization without requiring you to change code and recompile the application. ASP.NET supports this requirement with declarative authorization rules, which you can define in the web.config file. The rules you define are acted upon by the UrlAuthorizationModule, a specific HTTP module. This module examines these rules and checks each request to make sure users can t access resources you ve specifically restricted. This type of authorization is called URL authorization because it considers only two details the security context of the user and the URL of the resource that the user is attempting to access. If the page is forbidden and you re using forms authentication, the user will be redirected to the login page. If the page is forbidden and you re using Windows authentication, the user will receive an access denied (HTTP 401) error page, as shown in Figure 23-1, or a more generic error message or custom error page, depending on the <customErrors> element.

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