# File lib/pry-remote-em/server.rb, line 228
    def receive_auth(user, pass)
      return send_auth(true) if !@auth || !@auth_required
      return send_auth('auth data must include a user and pass') if user.nil? || pass.nil?
      auth_attempt(user, peer_ip)
      unless (@auth_required = !@auth.call(user, pass))
        @user = user
        auth_ok(user, peer_ip)
        authenticated!
      else
       auth_fail(user, peer_ip)
        if @auth_tries <= 0
          msg = "max authentication attempts reached"
          send_auth(msg)
          @log.debug("[pry-remote-em] #{msg} (#{peer_ip}:#{peer_port})")
          return close_connection_after_writing
        end
        @auth_tries -= 1
      end
      return send_auth(!@auth_required)
    end