ASP.NET MVC - Custom IIdentity or IPrincipal with Windows Authentication - asp.net-mvc

Question

I am working on an intranet site with Windows Authentication for logins. However, I want to extend the IPrincipal to have other properties. For instance, I'd like to get the user's FirstName in #User.FirstName or User.AuthorizedActivity("Admin/Permissions/Edit") (would retrieve from db) using activities instead of roles to hide certain links, etc. I am really having a heck of a time figuring this out over the past 2 days and find much information doing this with Windows Authentication.
My CustomPrincipal and BaseViewPage setup:
namespace Intranet_v2.Helpers
{
public interface ICustomPrincipal : IPrincipal
{
Guid UserGuid { get; set; }
string FirstName { get; set; }
string LastName { get; set; }
string FullName { get; set; }
}
public class CustomPrincipal : ICustomPrincipal
{
public IIdentity Identity { get; private set; }
public bool IsInRole(string role) { return false; }
public CustomPrincipal(string identity)
{
this.Identity = new GenericIdentity(identity);
}
public Guid UserGuid { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string FullName { get; set; }
}
public class CustomPrincipalSerializeModel
{
public Guid UserGuid { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string FullName { get; set; }
}
public class BaseController : Controller
{
protected virtual new CustomPrincipal User
{
get { return HttpContext.User as CustomPrincipal; }
}
}
public abstract class BaseViewPage : WebViewPage
{
public virtual new CustomPrincipal User
{
get { return base.User as CustomPrincipal; }
}
}
public abstract class BaseViewPage<TModel> : WebViewPage<TModel>
{
public virtual new CustomPrincipal User
{
get { return base.User as CustomPrincipal; }
}
}
}
Views Web.Config BaseViewPage:
<system.web.webPages.razor>
<host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<pages pageBaseType="Intranet_v2.Helpers.BaseViewPage">
<namespaces>
<add namespace="System.Web.Mvc" />
<add namespace="System.Web.Mvc.Ajax" />
<add namespace="System.Web.Mvc.Html" />
<add namespace="System.Web.Optimization"/>
<add namespace="System.Web.Routing" />
<add namespace="Intranet_v2" />
</namespaces>
</pages>
I think my main problem is I have no idea what to do in the protected void Application_PostAuthenticateRequest(object sender, EventArgs args) for my Global.asax.cs file. I have a poor attempt at setting it up here:
protected void Application_PostAuthenticateRequest(object sender, EventArgs args)
{
//var application = (HttpApplication)sender;
var context = application.Context;
if (context.User != null || !context.User.Identity.IsAuthenticated) return;
var formsIdentity = (FormsIdentity)context.User.Identity;
if (formsIdentity == null) return;
var ticket = formsIdentity.Ticket;
JavaScriptSerializer serializer = new JavaScriptSerializer();
CustomPrincipalSerializeModel serializeModel = serializer.Deserialize<CustomPrincipalSerializeModel>(ticket.UserData);
CustomPrincipal newUser = new CustomPrincipal(ticket.Name);
newUser.UserGuid = serializeModel.UserGuid;
newUser.FirstName = serializeModel.FirstName;
newUser.LastName = serializeModel.LastName;
newUser.FullName = serializeModel.FullName;
var values = ticket.UserData.Split('|');
var roles = values[1].Split(',');
context.User = new GenericPrincipal(new GenericIdentity(ticket.Name, "Forms"), roles);
}
Now I'm at the point where #User.Name is now null. I'm in way over my head on this. Any help is appreciated. My protected void Application_PostAuthenticateRequest(object sender, EventArgs args) is completely out of wack.
All I want to do is rely on Windows Authentication to do what it does normally and add a few extra properties to the HttpContext.Current.User. Any help is appreciated... I can't be the only one trying to do this.

Answer 1

What I normally do is just request the additional user information later. For instance, using an Extension method like:
public static class PrincipalExtensions
{
private static void Initialize(string userName)
{
var userRecord = //Get user information from DB;
var session = HttpContext.Current.Session;
if (session != null)
{
session.Add("UserID", userRecord.ID);
session.Add("UserEmail", userRecord.Email);
//And so on
}
}
public static long? GetUserID(this IPrincipal user)
{
var id = HttpContext.Current.Session["UserID"] as long?;
if (id == null)
Initialize();
return (long)HttpContext.Current.Session["UserID"];
}
}
This is roughly what I implement in some of my projects; rather than tapping into the login process and store it in the cookie, the system can lazy load the information and cache in session when the information is needed.