Krb_public.Client_identitySourcetype t = {client_principal : Principal.Name.t;The client principal
*)cross_realm_client_principal : Cross_realm_principal_name.t;The client principal with realm information
*)request_forwarded_creds : unit -> Cred_cache.t Async.Deferred.Or_error.t;Request a forwarded TGT from the client. The client must have explicitly enabled credential forwarding with on_credential_forwarding_request on connection establishment.
}