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    <p>If your authentication is already being handled by Windows (I'm guessing via Active Directory), then what you're looking for is an authorization mechanism which match roles to users. One option you have is to load the user roles into the current session once successfully. Then create a custom authorize attribute that will check if the current session has the necessary roles that you're working with</p> <pre><code>[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited=true, AllowMultiple=true)] public class CustomAuthorizationAttribute : AuthorizeAttribute { protected override bool AuthorizeCore(HttpContextBase httpContext) { IPrincipal user = httpContext.User; if (!user.Identity.IsAuthenticated) { return false; } //check your users against a database and return true or false return base.AuthorizeCore(httpContext); } } </code></pre> <p>Then you can use the attribute like this</p> <pre><code>[CustomAuthorization] public ActionResult SomeAction() { return View(); } </code></pre> <p><strong>UPDATE</strong></p> <p>AuthorizeCore is the method that will be used to check whether this user should be allowed to access the respective Action Method. Within this method you can check the httpContext.User.Identity.Name property against your database or where your roles are stored. If you're using Windows Authentication via Active Directory, HttpContext.User.Identity should be an instance of <a href="http://msdn.microsoft.com/en-us/library/system.security.principal.windowsidentity.aspx" rel="noreferrer">WindowsIdentity</a></p>
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    1. COHi thanks for that. The company uses Active Directory for user management/logon etc. but they have a separate app that handles role management for their various windows and web systems. This returns a list of roles for a given user and is called via a stored proc. I have seen articles about customising the authorization attribute so will probably do that, but I'd like to find a good high level guide to how the whole thing hangs together.
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    2. COAlso what does AuthorizeCore do...how do I use it to "check users against a database"?
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