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How can you authorize users in WCF What is the difference between authentication and authorization in the first place You should also take this opportunity to investigate some of the .NET Framework offerings to handle authentication and authorization. You ll first investigate the fundamentals of the .NET application security model.

There will come a time where you will find that your application has FullTrust and yet your assembly still throws permission errors. This can t happen, so you must have coded something incorrectly, right Well, actually you may have coded everything correctly. What most likely happened is one of the assemblies down the stack walk did not have FullTrust or a permission was overridden. It is with these last three actions on permissions that we override the standard stack walk.

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Figure 5 4. How the RelayCommand is envisaged to work The command target (ViewModel) will create one RelayCommand for each command it wishes to handle. These commands will then be exposed via public properties for binding by the ICommandSources in the view. When the command source calls the Execute method on the RelayCommand, it should delegate the call to its owning ViewModel, which is then free to handle the command itself, or perhaps forward the message on to a more appropriate object.

The Assert override is probably one of the most dangerous features of code access security and must be used carefully. The reason is that with Assert you can accidentally add permissions that the stack walk would normally have denied. This is because the Assert stops the stack walk at the stack frame where the Assert is made. For those of you more visually inclined, Figure 19-14 might help.

authentication and authorization. The objective is to create a specialized, static (once only) Principal object after the Active Directory authentication is approved. This Principal object will securely live on the client s desktop and attend authorization requests during the life span of the user session. The authorization and authentication are provided by different providers. This provider information is usually based in configuration files. The objective is to seamlessly transfer the user context from one authorization or authentication provider without any code changes. This is the best practice in the industry. It is important to note that WCF explicitly does not address authentication and authorization. What WCF does is evaluate claims and authenticate and authorize these claim sets utilizing .NET Framework to satisfy the security requirements.

Caution Microsoft warns that because calling Assert removes the requirement that all code in the call chain must be granted permission to access the specified resource, it can open up security vulnerabilities if used incorrectly or inappropriately. Therefore, it should be used with great caution.

Personally, I only use Assert when I have complete control of the call stack that is being walked. Keep in mind that Assert does not grant permission to a demand. The demand works as it normally would for that stack frame, so if that frame would normally have denied the permission the Assert point would also be denied permission. The actual code involved in an Assert is fairly simple: CodeAccessPermission ^permission = gcnew FileIOPermission(FileIOPermissionAccess::Read, "C:\\"); permission->Assert(); // Do stuff permission->RevertAssert(); Since only one Assert is allowed to be in effect at a time for a frame, you should make sure that you call the RevertAssert() method when you are done with your Assert. This basically turns off your Assert.

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