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CHAPTER 12 A UTHENT I CATI ON AN D A UTHORIZA TI ON
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If authenticated Then MyBase.Name = username MyBase.IsAuthenticated = True MyBase.Roles = roles ' list of roles from security store Else MyBase.Name = String.Empty MyBase.IsAuthenticated = False MyBase.Roles = Nothing End If End Sub End Class This is just an example, and to make this work, the DataPortal_Fetch() method needs to be finished, so it talks to the security store to validate the user s credentials and loads the user s list of roles. The UsernameCriteria class is used to easily pass the username and password credentials from the factory method through the data portal and to the DataPortal_Fetch() method. If an application uses credentials other than a username/password pair, the developer needs to create her own custom criteria class, as described in 5.
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MembershipProvider Authentication
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Creating a custom identity object that validates the user s credentials against the ASP.NET MembershipProvider component follows the same basic process I ve discussed thus far. The developer needs to create a custom principal and custom identity class as shown previously. However, CSLA .NET includes the MembershipIdentity class to simplify the process of validating the username and password against the ASP.NET security store. So instead of subclassing CslaIdentity, a developer can subclass MembershipIdentity because it already includes the code necessary to do the credential validation. This means creating a subclass that looks like this: <Serializable()> _ Public Class CustomIdentity Inherits MembershipIdentity Protected Overrides Sub LoadCustomData() ' load roles and any custom properties here End Sub End Class The MembershipIdentity base class takes care of validating the username and password but doesn t attempt to load any roles for the user. It does call the LoadCustomData() method shown here so the developer can override that method to load the user s roles and any other user-related data. By the time LoadCustomData() is invoked, the identity object is already loaded with the username, IsAuthenticated is True, and the identity object is essentially ready for use. If the user s credentials are invalid, no exception is thrown. Instead, an unauthenticated instance of MembershipIdentity is returned, with an IsAuthenticated value of False. In this case, the LoadCustomData() method is not invoked because the identity doesn t represent a valid user. You should now have an understanding of the difference between Windows and custom authentication. And you should understand how the BusinessPrincipalBase and various identity base classes can be used to create custom principal and identity objects that provide user and role information to .NET and CSLA .NET for authorization. In the rest of the chapter I discuss how CSLA .NET supports authorization at the type and property levels.
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CHAPTER 12 A UTHENT I CATI ON AN D A UTHORIZA TI ON
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Authorization supports the idea that each business object property and method can have a list of roles that are allowed and denied access. I already touched on some of these concepts when I discussed how properties are declared in 7. Behind the scenes, those methods make use of an AuthorizationRules object from the Csla.Security namespace. Every business object that uses authorization rules has an associated AuthorizationRules object that manages the list of roles associated with each property and method. The AuthorizationRules class also maintains a list of roles allowed to create, get, update, and delete each business object type. To do this work, AuthorizationRules relies on a number of other classes. Table 12-2 describes the types required for authorization.
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Table 12-2. Types Used to Implement the Authorization Subsystem
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AccessType AuthorizationRules AuthorizationRulesManager IAuthorizeReadWrite IsInRoleProvider ObjectAuthorizationRules NoAccessBehavior RolesForProperty RolesForType SharedAuthorizationRules
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Description
Lists access types for properties and methods Coordinates the functionality of the authorization subsystem Maintains list of roles for a business object or business object type Defines methods for use by UI components such as Csla. Wpf.Authorizer Defines a delegate signature for the method that resolves whether the current user is in a specific role Maintains the cache of all object type level authorization roles for all business object types Lists options describing what step should be taken when a user attempts an action but does not have access Maintains a list of roles allowed and denied access to a property Maintains a list of roles allowed and denied access to a business object type Maintains the cache of all per-type property authorization roles defined for all business object types
I ll discuss how these types are used to implement authorization at the business object type level and at the property level.
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