local server = changeme
rednet.open("back")

while true do
  textutils.slowPrint("please log in")
  textutils.slowPrint("Username:")
  local user = read()
  textutils.slowPrint("Password:")
  local pass = read()
  rednet.send(server, user.."n"..pass)
  textutils.slowPrint("waiting for server")

  local id, access
  repeat
    id, access = rednet.receive()
  until id == server
  if access == "granted" then
    textutils.slowPrint("access granted for 10 seconds")
    redstone.setOutput("left", true)
    sleep(10)
    redstone.setOutput("left", false)
    term.clear()
    term.setCursorPos(1, 1)
  else
    textutils.slowPrint("access denied")
    sleep(2)
    term.clear()
    term.setCursorPos(1, 1)
  end
end