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Since the principal and identity objects contain very few properties and methods, they are rather easy to code. There are only a couple of things that you might find tricky. The first thing you need to know about principals is how to get access to them. You find them using the static property CurrentPrincipal on the Thread object. Since this property returns an IPrincipal, you normally typecast it to either the WindowsPrincipal or the GenericPrincipal like this: WindowsPrincipal ^wPrinc = (WindowsPrincipal^)Thread::CurrentPrincipal; GenericPrincipal ^gPrinc = (GenericPrincipal^)Thread::CurrentPrincipal; The other issue you need to be aware of is that you have to specify how principal and identity objects should be created for the application domain in which the thread is running. You do this by invoking the AppDomain::CurrentDomain->SetPrincipalPolicy() method using as its parameter the appropriate PrincipalPolicy enumeration. The default is PrincipalPolicy::UnauthenticatedPrincipal, which means that the principal has its Name property set to an empty string ("") and its IsAuthenticated property set to false. What you need to set it to is PrincipalPolicy::WindowsPrincipal, which will return the current user associated with the thread along with all the groups it is in as roles. There is also PrincipalPolicy::NoPrincipal, which will cause a nullptr to be returned (not that you will need this when doing role-based security). Here is how you would code it: AppDomain::CurrentDomain->SetPrincipalPolicy(PrincipalPolicy::WindowsPrincipal);

When you have added the Rules.xml file shown in Listing 13-11, you can then compile the project. Copy the resulting assembly to the FxCop Rules folder (C:\Program Files\ Microsoft Visual Studio 8\Team Tools\Static Analysis Tools\FxCop\Rules).

Why is PrincipalPolicy::UnauthenticatedPrincipal the default I m not sure, as it is not normally what you are looking for. Oh, and one final gotcha. You need to set PrincipalPolicy before you call the Thread::CurrentPrincipal method because the SetPrincipalPolicy() method does not change the principal s type once it s been created. Listing 21-1 is a simple example that first gets the Thread s current WindowsPrincipal and WindowsIdentity and displays their information, and then resets the CurrentThread so that it contains a dynamically created GenericPrincipal and GenericIdentity. Listing 21-1. Getting and Setting Principals and Identities using using using using namespace namespace namespace namespace System; System::Security; System::Security::Principal; System::Threading;

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Okay, having principals and identities is all very nice, but how does that secure your code The simple answer is that it doesn t. You still have to add code to your program that provides this security. There are three techniques for doing this. The first technique you have already seen (though you may not have been aware of it). You surround the code that you want restricted to specific roles with the IsInRole() method, like this: if (wPrinc->IsInRole(WindowsBuiltInRole::Administrator)) { // do administrative stuff } Easy enough, but to use this technique you need to get the principal of the executing thread though as you have already seen, getting Thread::CurrentPrincipal is not difficult.

Note If you examine the list of rules, you will note that the new rule you created is listed there, but there

// FillColorController.h #import "SelectColorController.h" @interface FillColorController : SelectColorController {} @end // FillColorController.m #import "FillColorController.h" @implementation FillColorController @end

The second technique of securing your code by role is by using what is known as declarative role-based security With this technique you declare a method with the additional attribute PrincipalPermissionAttribute that specifies which roles are allowed to execute it (I cover other PermissionAttributes later in the chapter, and I will go into greater detail at that time) Basically, you demand that a principal have a specified role like this: [PrincipalPermissionAttribute(SecurityAction::Demand, Role="BUILTIN\\Administrator")] void DeclarativeSecurity() { // do administrative stuff } The third technique is a kind of a mix of the prior two, called imperative role-based security With this approach, you demand that a principal have a specific role but you make the demand (normally) just before the secured code This technique requires that you create an instance of a PrincipalPermission and then execute its Demand() method.

I usually do this in one line: (gcnew PrincipalPermission(nullptr, "BUILTIN\\Administrator"))->Demand(); But you can break it up into its parts and it works just the same Notice the first parameter of the PrincipalPermission is a nullptr This parameter allows you to specify a specific principal s name as well as a role By passing nullptr you tell the PrincipalPermission to use any user principal with this role If you were to specify a principal name, then only that specific principal/role pair would be used which means you are no longer using role-based security and instead are using principal-based (user-based) security One major difference between technique 1 (the IsInRole) and technique 2 (declarative) and 3 (imperative) is that if the demand fails on techniques 2 and 3 a SecurityException is thrown In the case of technique 1, only a false condition occurs.

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