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Impersonation Configuration
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When hosting a web application for general public consumption, it s usually acceptable to allow Anonymous access to your web server. But what if you wanted to enable more functionality (requiring greater permissions) for certain users What if certain users need Write permissions on a target folder on the web server or need to write to an event log ASP .NET can handle this situation by using a technique known as impersonation. In any situation that involves Windows Integrated security (in an intranet or extranet application, for example), you can enable impersonation on your ASP .NET application. This means ASP .NET will use the authentication token determined by IIS instead of its own mechanism, so your users can be authenticated as local or domain accounts that have more privileges than the standard ASPNET/NETWORK SERVICE account or the IUSR_MachineName account. With impersonation turned off, there s an entry in the Machine.config file that determines which account is used for Anonymous access. The entry is <processModel>, and the default setting is username="Machine", password="AutoGenerate". This special "Machine" value maps to the ASPNET or NETWORK SERVICE account. Impersonation can be turned on by adding the following to the system.web section of either the Machine.config or Web.config file: <identity impersonate="true" /> Using this setting, if Anonymous access is enabled on IIS, your anonymous ASP .NET users are now authenticated using the IUSR_MachineName account, instead of the ASPNET or NETWORK SERVICE account. You can configure impersonation further by adding to this definition: <identity impersonate="true" username="name" password="password"/> Here, the user name and password must relate to a valid account on the web server. This setting affects only the account under which the ASP .NET process itself is run; it doesn t affect Anonymous access to any other IIS-based application. Implementing impersonation gives users of your application a specific set of permissions for performing tasks that the basic ASPNET user account cannot perform.
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APPENDIX B MANAGEMENT OF IIS AND MSDE
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This is a two-phase process: IIS authentication: IIS determines the Windows identity depending on authentication settings or uses the account set for the Anonymous access, if it s enabled. ASP .NET impersonation: For the request execution, the ASP .NET engine impersonates the account set in the <identity> element or the one received from IIS, if no particular one is set. The one received from IIS may be the IUSR_MachineName account or the actual Windows local/domain account the user logged in with, depending on the IIS authentication settings.
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Try It Out: Establish Identity Let s take a look at how to use impersonation with a quick example that declares the user account under which ASP .NET is currently authenticated. 1. Open VS .NET and create a new web application called ImpersonationExample. 2. Create a new web form in your application by right-clicking the application in the Solution Explorer and selecting Add Add Web Form. Call the new form ImpersonateMe.aspx. 3. Delete WebForm1.aspx from the project, right-click ImpersonateMe.aspx, and select Set As Start Page from the context menu. 4. View the code-behind file for ImpersonateMe.aspx and enter the following code into the Page_Load() event handler: Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Response.Write("I am authenticated as: " + _ WindowsIdentity.GetCurrent().Name) End Sub 5. In order to get access to the WindowsIdentity class, you need to tell your web page to reference the classes in the System.Security namespace. Add the following line to the top of the code-behind page, before the class definition: Imports System.Security.Principal 6. Run the project, and view the results. (In Windows Server 2003, you will see NT AUTHORITY\NETWORK SERVICE instead.)
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APPENDIX B MANAGEMENT OF IIS AND MSDE
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How It Works So far, you have not done anything too complex. You just confirmed the fact that ASP .NET pages are run under an account on the web server called ASPNET (NETWORK SERVICE in Windows Server 2003): Response.Write("I am authenticated as: " + _ WindowsIdentity.GetCurrent().Name) Here, you ve output a simple line of text on your browser that gathers information from the local system, using functionality provided by the System.Security namespace. Try It Out: Enable Impersonation with Anonymous Access Let s now extend the example to see how you can enable impersonation for anonymous users and what effect this has on your application. 1. In the ImpersonationExample application, open the Web.config file and add the following line near the top: < xml version="1.0" encoding="utf-8" > <configuration> <system.web> ... <identity impersonate="true" /> ... </system.web> </configuration> 2. Run the application again, and you ll see something similar to the following page.
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How It Works The <identity> tag that you added to the Web.config file has changed the default user account for Anonymous access to your ASP .NET application. The application has reverted to the default user account for all IIS Anonymous access, which is IUSR_MachineName (IUSR_WINXP-VM in the example). If you had configured IIS to use a different account for standard Anonymous access, the details of that account would be displayed instead.
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