How to protect an entire MVC Area by IP/Role/User?

Question

I know in MVC at the top of a controller you can use the [Authorize()] attribute to restrict access to that entire controller to certain authenticated users and/or roles, but not by IP, but this must be done on a per controller instance. Is there a way to restrict access to an entire MVC Area to an authenticated User/Role or by the request Source IP?

Answer 1

Create a Base Controller in your area:

[AuthorizeArea(AllowIpAddresses = new [] {"1.1.1.1", "1.2.3.4"})]
public class CustomAreaBaseController : Controller
{
    public CustomAreaBaseController()
    {
        // possibly any other common code that you want to run for all controllers in this area
    }
}

Have all controllers in your area derive from base controller:

public class HomeController : CustomAreaBaseController
{
    // actions for this controller
}

Create custom Authorize Attribute:

public class AuthorizeArea : AuthorizeAttribute
{
    public string[] AllowIpAddresses { get; set; }

    protected override bool AuthorizeCore(HttpContextBase httpContext)
    {
        bool isValid = false;

        if (httpContext == null)
            throw new ArgumentNullException("httpContext");

        // get current ip address
        var ipAddress = httpContext.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
        if (string.IsNullOrEmpty(ipAddress))
            ipAddress = httpContext.Request.ServerVariables["remote_host"];

        if (AllowIpAddresses.Contains(ipAddress)) isValid = true;

        return base.AuthorizeCore(httpContext) && isValid;
    }
}