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All principal objects implement the IPrincipal interface, which defines a core set of functionality. When you access the User property of the current web page (System.Web.UI.Page) or from the current HTTP context (HttpContext.Current), you re accessing an IPrincipal object that represents the security context of the current user. The IPrincipal interface defines a single property named Identity, which retrieves an IIdentity object that provides information about the current user. The IPrincipal interface also defines a single method named IsInRole(), which allows you to test whether the current user is a member of a specific role. Here s an example that uses the IsInRole() method to test whether the current user is a member of a role named Admin: If HttpContext.Current.User.IsInRole("Admin") Then ' (Do something.) End If When using Windows authentication or forms authentication, the principal object is created automatically. However, it s also possible to create a principal object on the fly, with user and role information that you extract from another location, such as a custom database. You ll see examples of both techniques in later chapters.

Finally, if you want to include additional setup steps in your setup project, you can create custom installer classes, which include setup steps executed by Windows Installer during the different steps of the install and uninstall processes. For adding a custom installer class, you need to add a class library to your solution that contains the installer class. After you have added the class library project, you can add a new installer class to the class library by selecting Project Add New Item within your class library. In the Add New Item dialog box, you then select Installer Class, as shown in Figure 18-40.

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Before the ASP.NET runtime even gets in touch with an incoming request, IIS verifies the security according to its own configuration. Therefore, before you learn about the details of ASP .NET security, you have to learn about the first gatekeeper in the security pipeline of your web application IIS. IIS provides you with a couple of essential security mechanisms that act as gatekeepers before ASP .NET starts with the request processing. Basically, IIS includes the following security mechanisms: Authentication: IIS supports Basic authentication, Digest authentication, Passport authentication, and Windows authentication as well as certificate authentication through an SSL channel. Any authentication IIS performs results in an authenticated Windows user. Therefore, IIS supports authenticating Windows users only. Authorization: IIS provides built-in support of IP address restrictions and evaluation of Windows ACLs. Confidentiality: Encryption can be enforced through SSL. In the following sections, you will learn about the details of IIS security configuration. The other subsequent security chapters will go into the details of the ASP.NET security infrastructure. You have to keep IIS security always in mind, because it affects how ASP .NET behaves with different security settings applied in web.config. For example, if your ASP.NET application wants to use Windows authentication, you should configure IIS to use either Windows or Basic (or Digest) authentication. If your ASP.NET web application doesn t want to use Windows accounts (and therefore use custom or forms authentication), you must configure IIS to allow anonymous access.

Figure 18-40. Adding a custom installer class This adds a class to your class library that is inherited from the base class System.Configuration. Install.Installer. In your installer class, you can override several methods, which are called during the execution steps of a setup package as follows: namespace Apress.CustomInstaller { [RunInstaller(true)] public partial class DbInstaller : System.Configuration.Install.Installer { public DbInstaller() { InitializeComponent(); }

Like the IPrincipal interface, the IIdentity interface provides consistency no matter what authentication scheme you use. All identity objects must implement IIdentity. The IIdentity interface defines the basic information needed to represent the current user. At a minimum, this includes the following three read-only properties: AuthenticationType: Returns the type of authentication used as a string (forms, Passport, NTLM, or a custom authentication type) IsAuthenticated: Returns a Boolean value that indicates whether the user has been authenticated (True) or is anonymous (False) Name: Returns the name of the current user as a string You can access the IIdentity object that represents the current user through the IPrincipal object. Here s an example that uses this technique to check whether the user has been authenticated: If HttpContext.Current.User.Identity.IsAuthenticated Then lblUserName.Text = HttpContext.Current.User.Identity.Name & " is logged in" End If

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