I'm trying to replace the backend login to Umbraco with an openidconnect server I am running. I have all of the code to handle auth successfully working within the Umbraco project, but I am struggling to make it replace the backend authentication. I have installed UmbracoIdentityExtensions, replaced the standard owin startup in the web.config with the umbracostandardowinstartup and changed the code in it to look like this;

    public class UmbracoStandardOwinStartup : UmbracoDefaultOwinStartup
{
    public override void Configuration(IAppBuilder app)
    {
        //ensure the default options are configured
        base.Configuration(app);

        app.UseUmbracoBackOfficeCookieAuthentication(ApplicationContext.Current);
        app.UseUmbracoBackOfficeExternalCookieAuthentication(ApplicationContext.Current);

        app.UseCookieAuthentication(new CookieAuthenticationOptions
        {
            AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie
        });

        app.UseOpenIdConnectAuthentication(new OpenIdConnectAuthenticationOptions
        {
            Authority = "https://localhost:44333/identity",
            ClientId = "MVCTestsite",
            RedirectUri = "http://localhost:44302/Umbraco",
            ResponseType = "id_token",
            Scope = "openid profile roles email",

            SignInAsAuthenticationType = CookieAuthenticationDefaults.AuthenticationType
        });
    }
}

Unfortunately it is here that I am stuck. I do not know how to change the back-end login from using the Umbraco authentication to using my custom provider.

Any help or pointers would be greatly appreciated!