ComputerProtection.Lua

-- computer password protection with built-in password setup

local pullEvent = os.pullEvent -- stops people from using ctrl + t
os.pullEvent = os.pullEventRaw -- ..
local loop = true
local Tries = 3 -- after this amount of tries the computer shuts down
while loop do -- loop :)
    term.clear()
    term.setCursorPos(1,1)
    if fs.exists("Password") then -- check if there is a password set already
        file = io.open("Password", "r")
        Password = file:read() -- get actual password
        textutils.slowPrint("Enter password: ")
        local Input = read("*")
        if Input == Password then -- compare actual password to user input
            textutils.slowPrint("Password correct.")
            loop = false
            os.pullEvent = pullEvent -- you can use ctrl + t if it crashed here
        else -- password wrong
            Tries = (Tries - 1) -- minus 1 try
            textutils.slowPrint("Password incorrect.")
            textutils.slowPrint("Tries left: ")
            textutils.slowPrint(Tries)
            if Tries == 0 then
                sleep(2)
                os.shutdown() -- reboot if tries = 0
            end
        end
    else -- no password yet
        textutils.slowPrint("Please choose a password:")
        PasswordFile = read("*") -- type password
        textutils.slowPrint("Password chosen: "..PasswordFile)
        print("Do you want this password?") -- confirm
        PasswordOK = read()
        if PasswordOK == "Yes" then
            file = io.open("Password", "w")
            file:write(PasswordFile) -- store password
            file:close()
        end
    end
end