A UTHENT I CATI ON AN D A UTHORIZA TI ON in VB.NET

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CHAPTER 12 A UTHENT I CATI ON AN D A UTHORIZA TI ON
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The PrincipalRoleInList() method loops through the list of roles to determine whether the current user is in any of the roles in the list. This method is just a simple loop, but it calls a Private method named IsInRole() rather than calling the IsInRole() method on the current principal object. Here s the IsInRole() method: Private Shared Function IsInRole( _ ByVal principal As IPrincipal, ByVal role As String) As Boolean If _IsInRoleProvider Is Nothing Then Dim provider = ApplicationContext.IsInRoleProvider If String.IsNullOrEmpty(provider) Then _IsInRoleProvider = IsInRoleDefault Else Dim items = provider.Split(","c) Dim containingType = Type.GetType(items(0) & "," & items(1)) _IsInRoleProvider = DirectCast(([Delegate].CreateDelegate( _ GetType(IsInRoleProvider), _ containingType, items(2))), IsInRoleProvider) End If End If Return _IsInRoleProvider(principal, role) End Function This method abstracts the IsInRole() concept so it isn t necessarily tied to checking with the current principal object. If the application s config file contains an entry for an IsInRoleProvider() method, that method is used instead of the default. The config entry would go in the <appSettings> element and would look like this: <add key="CslaIsInRoleProvider" value="Namespace.Class.Method,Assembly" /> The default IsInRoleProvider() exists in the AuthorizationRules class and looks like this: Private Shared Function IsInRoleDefault( _ ByVal principal As IPrincipal, ByVal role As String) As Boolean Return principal.IsInRole(role) End Function The reason for all this work is to allow an advanced business developer to replace how the IsInRole() operation is performed by substituting his own method for this one. At this point you should understand how business type level authorization roles are stored in ObjectAuthorizationRules and how the AuthorizationRules class makes the behaviors available both to the business object developer and to any other code that needs to check the rules.
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Property-Level and Method-Level Authorization
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It is quite common for a user to have access to a form or a page but not to all the data on that form. Or a user may be allowed to view some data but not change it, based on her role. CSLA .NET supports this concept by allowing a business developer to specify which roles are allowed or denied read and write access to each property on a business object. The developer can do the same thing for methods exposed by the object by specifying which roles are allowed to execute the method. Per-property authorization is implemented by the GetProperty() and SetProperty() methods I discussed in 7. These two methods call CanReadProperty() and CanWriteProperty(), which actually perform the role checks with the help of the AuthorizationRules object. Per-method authorization requires that the method implementation make an explicit call to CanExecuteMethod() before doing any actual work. The CanExecuteMethod() does the role check with the help of the AuthorizationRules object.
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CHAPTER 12 A UTHENT I CATI ON AN D A UTHORIZA TI ON
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Table 12-4 describes the AuthorizationRules methods available to a business developer to specify roles that are allowed or denied access to properties and methods.
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Table 12-4. Property and Method Authorization Options
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Method
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AllowRead() DenyRead() AllowWrite() DenyWrite() AllowExecute() DenyExecute()
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Specifies the roles allowed to read a property Specifies the roles not allowed to read a property Specifies the roles allowed to write to a property Specifies the roles not allowed to write to a property Specifies the roles allowed to execute a method Specifies the roles not allowed to execute a method
The default implementation provided by CSLA .NET is permissive. This means that by default all users are allowed to read and write to all properties and to execute all methods. However, if one or more roles are allowed to read, write, or execute, all other roles are denied access. Alternately, you can choose to deny access to specific roles, in which case all other roles continue to have access. Not only does each object enforce its rules but the rules are exposed publicly to the rest of the application. This is primarily so a UI developer can enable and disable UI controls to give the user visual cues about what she can and can t do. The IAuthorizeReadWrite interface in the Csla.Security namespace provides a standardized way to access this information, and it is used by the UI controls discussed in 10.
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