password = "pie"

function getUsers()
	prox = peripheral.wrap("top")
	targets = prox.getTargets()
	for k,v in pairs(targets) do
		if v.Name == "Player" then
		  details = prox.getTargetDetails(k)
		  return details.Username
		end
	end
end

rednet.open("left")
while true do
	id, msg, prot = rednet.receive()
	if prot == "pass" then
		if msg == password then
			rednet.send(id, "granted", "pass")
		else
			rednet.send(id, "denied", "pass")
		end
	end
	if prot == "getUser" then
		rednet.send(id, getUsers(), "getUser")
	end
end