Multitenant Identity Server 4

Question

I'm trying to implement an IdentityServer that handles an SSO for a multitenant application. Our system will have only one IdentityServer4 instance to handle the authentication of a multitentant client.

On the client side, I'm using the acr_value to pass the tenant Id. A piece of code from the Startup.cs file is as follows:

public void ConfigureServices(IServiceCollection services)
{
        services.AddMvc();
        services.AddAuthorization();

        services.AddAuthentication(options =>
            {
                options.DefaultScheme = "Cookies";
                options.DefaultChallengeScheme = "oidc";
            })
            .AddCookie("Cookies")
            .AddOpenIdConnect("oidc", options =>
            {
                options.SignInScheme = "Cookies";
                options.Authority = "http://localhost:5000";
                options.RequireHttpsMetadata = false;
                options.ClientId = "Client1";
                options.ClientSecret = "secret";
                options.ResponseType = "code id_token";
                options.SaveTokens = true;
                options.GetClaimsFromUserInfoEndpoint = true;                    
                options.Scope.Add("openid");
                options.Scope.Add("profile");
                options.Scope.Add("offline_access");
                options.Events.OnRedirectToIdentityProvider = n =>
                {
                    if (n.ProtocolMessage.RequestType == 
                          OpenIdConnectRequestType.Authentication)
                    {
                        n.ProtocolMessage.AcrValues = "tenant:clientId1";
                    }
                    return Task.FromResult(0);
                };
            });
}

For the identity server the IdentityServer4 with ASP.NET Core Identity is used. To handle multitenant client authentication I followed the instructions given by Scott Brady for ASP.NET Identity in this post: https://www.scottbrady91.com/ASPNET-Identity/Quick-and-Easy-ASPNET-Identity-Multitenancy

I modified the UserStore to receive the tenant Id but the moment of the UserStore instance is injected for the AccountController I can't retrieve the passed acr_value.

Has any one faced this problem before?

Solution

if you haven't figure out yet, here is the solution

private readonly IIdentityServerInteractionService _interaction;


 var context = await _interaction.GetAuthorizationContextAsync(model.ReturnUrl);
            var tenant = context.Tenant;