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MembershipIdentity UsernameCriteria UnauthenticatedIdentity UnauthenticatedPrincipal
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A developer can use these classes to implement custom authentication against almost any security store and to create custom principal and identity objects that can be used by .NET and CSLA .NET for authorization.
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CHAPTER 12 A UTHENT ICATION AN D A UTHORIZA TION
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You can look at the code in these classes in the code download for this book (www.apress.com/ book/view/1430210192 or www.lhotka.net/cslanet/download.aspx). Here, I focus on the issues they are designed to address.
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Creating a Custom Principal Class
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The data portal, which I discuss in 15, can only deal with Serializable objects. And when CSLA .NET is configured to use custom authentication, it automatically serializes the client principal and identity objects and copies them to the application server on each data portal call. The result is that the application server is able to impersonate the client s identity.
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While CSLA .NET for Silverlight is not the topic of this book, it also has a data portal that serializes objects, and BusinessPrincipalBase is designed to work with CSLA .NET for Silverlight as well.
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The BusinessPrincipalBase class is a very basic implementation of the IPrincipal interface from System.Security.Principal that is compatible with the data portal. The goal of this class is to make it easier for a business developer to create her own custom principal by subclassing BusinessPrincipalBase. The simplest approach is a subclass like this: [Serializable] public class CustomPrincipal : BusinessPrincipalBase { private CustomPrincipal(IIdentity identity) : base(identity) { } public static void Login(string username, string password) { var identity = CustomIdentity.GetIdentity(username, password); Csla.ApplicationContext.User = new CustomPrincipal(identity); } public static void Logout() { var identity = new UnauthenticatedIdentity(); Csla.ApplicationContext.User = new CustomPrincipal(identity); } } The Login() method calls the factory method on a CustomIdentity class (which I show in the next section) to get back an identity object. That identity object may or may not be authenticated, but it is a valid object either way. The identity object is passed as a parameter to the constructor of CustomPrincipal, which passes it to the BusinessPrincipalBase base class. The important thing is that the resulting principal object, containing its identity object (either authenticated or not), is set as the current principal by setting the User property of Csla.ApplicationContext. This ensures that the principal is available to the current thread and/or the current HttpContext as appropriate.
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CHAPTER 12 A UTHENT ICATION AN D A UTHORIZA TION
As BusinessPrincipalBase implements IPrincipal, it has an Identity property that returns the identity object created in the Login() method. Its IsInRole() method calls the identity object contained by this principal, assuming that identity object is a subclass of CslaIdentity. Here s the IsInRole() implementation from BusinessPrincipalBase: public virtual bool IsInRole(string role) { var cslaIdentity = _identity as CslaIdentity; if (cslaIdentity != null) return cslaIdentity.IsInRole(role); else return false; } The method is virtual, so a subclass can replace the implementation, but if the identity object is a subclass of CslaIdentity, this implementation does the work automatically. As you ll see in the next section of this chapter, I recommend having the identity object authenticate the user s credentials and (if successful) load the user s roles, all in one trip to the security store. Also, take a look at the Logout() method. Notice how it creates a CustomPrincipal object but with an UnauthenticatedIdentity as its identity. The UnauthenticatedIdentity object has no username and no roles and its IsAuthenticated property returns false. You ll see a more complete example in 17 when I walk through the ProjectTracker reference application s business object implementation.
Creating a Custom Identity Class
Every principal object contains an identity object. In fact, the identity object is the object that contains information about the user, such as the username, how the user was authenticated, and so forth. Identity objects implement IIdentity from the System.Security.Principal namespace, and CslaIdentity is a base class that makes it easy to create custom identity classes that work with the data portal. When a user logs in using custom authentication, the typical model is to authenticate his credentials using a read-only root object (see the stereotype discussion in s 4 and 5). The CslaIdentity class inherits from ReadOnlyBase so it is not only an identity object but can handle the authentication process in its DataPortal_Fetch() method: [Serializable] public abstract partial class CslaIdentity : ReadOnlyBase<CslaIdentity>, IIdentity By subclassing CslaIdentity, the developer can focus more directly on authenticating the user s credentials and (if successful) loading the user s list of roles. Here s a very simple subclass: [Serializable] public class CustomIdentity : CslaIdentity { private CustomIdentity() { /* require use of factory method */ } public static void GetIdentity(string username, string password) { return DataPortal.Fetch<CustomIdentity>( new UsernameCriteria(username, password)); }
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