ASP.NET Core Identity with Windows Authentication

Question

I\'m using .NET Core 3.0 Preview6.
We have an Intranet application with enabled Windows authentication which means that only valid AD users are allowed to use the applicatio

Answer 1

This is fixed now. It's been a bug in the preview releases. Now it's working like intended. Good luck!

Update: I'd like to post my working code for .NET Core 3.1 Final.

1. It's essential to register the custom login middleware after framework middlewares in Configure:

    app.UseAuthentication();
    app.UseAuthorization();
    app.UseMiddleware<AutoLoginMiddleware>();

2. In the custom middleware, after signing in the user you must call CreateUserPrincipalAsync and save this principal to the HttpContext.User property.

   await signInManager.SignInAsync(user, true);
   context.User = await signInManager.CreateUserPrincipalAsync(user);
   

3. For Blazor, we must use AuthenticationStateProvider. It has a property User which contains the ClaimsPrincipal from HttpContext. That's it.

4. You are now able to get the Identity user like follows:

   var authState = await _authenticationStateProvider.GetAuthenticationStateAsync();
   var intranetUser = await UserManager.GetUserAsync(authState.User);