MVC 5 openid connect on-premises ADFS 4.0 logout issue - asp.net-mvc

Question

I am trying to setup a new MVC 5 project and a new 2016 server with ADFS. I can authenticate with Oauth 2 and OpenID Connect. The issue I have is when I try to logout of the application. The sign out link points to the default /Account/SignOut action. When that action is called I get redirected to the post logout redirect uri which is https://website.com. This redirect loops until the browser errors out with "website redirected you too many times".
This is my signout method.
public void SignOut()
{
string callbackUrl = Url.Action("SignOutCallback", "Account", routeValues: null, protocol: Request.Url.Scheme);
// Send an OpenID Connect sign-out request.
HttpContext.GetOwinContext().Authentication.SignOut(
new AuthenticationProperties { RedirectUri = callbackUrl },
OpenIdConnectAuthenticationDefaults.AuthenticationType, CookieAuthenticationDefaults.AuthenticationType
);
}
If I just call
HttpContext.GetOwinContext().Authentication.SignOut(CookieAuthenticationDefaults.AuthenticationType)
the logout fails but at least the constant redirects don't happen.
Is there an overload of the Authentication.Signout() method which logs me out and then redirects to the post logout redirect uri?

Answer 1

I worked with MS support and determined that Sign Out is not currently supported for OID Connect with ADFS 2016. It may be part of a future release, but as of now there is no set release date for support.

Answer 2

ADFS 4.0 (on Windows Server 2016) supports "Single log-out". If you use Microsoft.AspNetCore.Authentication.OpenIDConnect package (this is the newer one, for ASP.NET Core) it works seamlessly.
If you query the well known endpoint for OpenID Connect configuration, which is https://your-server/adfs/.well-known/openid-configuration, you will find a key end_session_endpoint which contains the logout URL you should use.
Also, you can check the documentation: https://learn.microsoft.com/en-us/windows-server/identity/ad-fs/development/ad-fs-logout-openid-connect
For instance, in order to invoke it from your controller, you would would use an action method like this one:
[HttpGet]
public IActionResult SignOut()
{
var callbackUrl = Url.Action(nameof(SignedOut), "Account", values: null, protocol: Request.Scheme);
return SignOut(
new AuthenticationProperties { RedirectUri = callbackUrl },
CookieAuthenticationDefaults.AuthenticationScheme,
OpenIdConnectDefaults.AuthenticationScheme);
}
You might find this sample useful (even though it is for Azure ADFS, it works for local installs as well): https://github.com/Azure-Samples/active-directory-dotnet-webapp-openidconnect-aspnetcore