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CSLA .NET supports either integrated Windows authentication (Active Directory or AD) or custom authentication. Using the ASP.NET MembershipProvider is considered a form of custom authentication because CSLA .NET can be used totally outside of ASP.NET, but you can still choose to authenticate using that model. In all cases, the current thread should have a valid principal object and associated identity object, allowing the authorization code discussed later in this chapter to verify the user s roles as appropriate. You should also be aware that when using custom authentication, the data portal requires that the custom principal object inherit from the Csla.Security.BusinessPrincipalBase class. A business application implements its own principal and identity classes so it can authenticate the user and load the user s roles as appropriate for the application. In the .NET security model used by CSLA .NET, the user is always identified by a principal object, which must implement the IPrincipal interface from the System.Security.Principal namespace.
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CHAPTER 12 A UTHENT I CATI ON AN D A UTHORIZA TI ON
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Every principal object contains exactly one identity object, which must implement the IIdentity interface from that same namespace. If you are using integrated Windows authentication, the .NET environment automatically has WindowsPrincipal and WindowsIdentity objects initialized for you to use. They contain the user s identity and groups, based on the username entered when logging into the Windows workstation or website. In other words, your application has to do almost nothing in this case because Windows and .NET have done most of the work. If you are using custom authentication (including using the ASP.NET MembershipProvider model), you must create your own custom principal and identity classes, and you must get the username/ password (or other credentials) from the user to create those objects. This is obviously more work but allows you the flexibility of authenticating the user in any way you choose. The CSLA .NET framework includes the Csla.Security namespace, where you can find several classes to help in the implementation of custom authentication. Before I get into that namespace, however, you should understand how CSLA .NET manages and exposes the current .NET principal object in different environments. I ll first discuss the Csla.ApplicationContext.User property, which manages and exposes the principal object in Windows, web, and WPF applications. Then I ll show you how to configure CSLA .NET to use either integrated Windows authentication or custom authentication. Once you understand those issues, I dig into the Csla.Security namespace.
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Csla.ApplicationContext.User Property
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When code is running outside ASP.NET, it relies on System.Threading.Thread.CurrentPrincipal to maintain the user s principal object. On the other hand, when code is running inside ASP.NET, the only reliable way to find the user s principal object is through HttpContext.Current.User. Normally, this would mean that you would have to write code to detect whether HttpContext.Current is null and use System.Threading only if HttpContext isn t available. The User property of the Csla.ApplicationContext module automates this process on your behalf: Public Property User() As IPrincipal Get If HttpContext.Current Is Nothing Then Return Thread.CurrentPrincipal Else Return HttpContext.Current.User End If End Get Set(ByVal value As IPrincipal) If HttpContext.Current IsNot Nothing Then HttpContext.Current.User = value End If Thread.CurrentPrincipal = value End Set End Property In general, you should use Csla.ApplicationContext.User in favor of System.Threading or HttpContext because it automatically adjusts to the environment in which your code is running. With CSLA .NET based applications, this is particularly important, because your client code could be a Windows Forms application, but your server code could be running within ASP.NET. Remember that your business objects run in both locations, so they must behave properly both inside and outside ASP.NET.
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When using integrated Windows authentication, your application and .NET relies on the underlying Windows operating system to take care of the authentication and to provide information about the user. Although most of the work is done for you by Windows and .NET, you do need to configure the environment, including both CSLA .NET and .NET.
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