Remote Password Protection [With failure events, auto-shutdown, and easy password change]

modem = "back"

rednet.open(modem)
term.clear()
term.setCursorPos(1,1)
print("Serving Password Requests...")
print("['q' to quit 'c' to change password]")
file = io.open("disk/password.txt","r")
password = file:read()
file:close()
answer = ""
while(true) do
	event,param1,param2 = os.pullEvent()
	if(event == "rednet_message" and param2 == "password") then rednet.send(param1,password)
	elseif(event == "char") then
if(param1 == "q") then break
elseif(param1 == "c") then
	 write("New Password: ")
	 while(true) do
  event,param1,param2 = os.pullEvent()
  if(event == "char") then
	  answer = answer..param1
	  write(param1)
  elseif(event == "key") then
	  if(param1 == 28) then -- ENTER
   break
	  elseif(param1 == 14) then -- Backspace
   x,y = term.getCursorPos()
   term.clearLine()
   term.setCursorPos(1,y)
   write("New Password: ")
   answer = ""
	  end
  end
	 end
	 file = io.open("disk/password.txt","w")
	 file:write(answer)
	 print("")
	 print("Password Changed to: "..answer)
	 password = answer
	 file:close()
	 answer = ""
end
	end
end

username = "Cookies19"
door = "left"
modem = "back"
os.startTimer(30) --go to sleep after 30 seconds (see event)
rednet.open(modem)
rednet.broadcast("password")
id,message = rednet.receive(5)
password = message
term.clear()
term.setCursorPos(1,1)
print("Terminal of Awesomeness")
print("***********************")
print("User Name: ")
write("Password: ")
term.setCursorPos(12,3)
textutils.slowPrint(username)
term.setCursorPos(11,4)
answer = ""
while(true) do
	event,param1,param2 = os.pullEventRaw()
	if(event == "terminate") then print("")print("")print("Now why on earth would I let you do that?") sleep(3) os.shutdown()
	elseif(event == "char") then
answer = answer..param1
write(param1)
	elseif(event == "key")
then
if(param1 == 28) then --ENTER
	 break
elseif(param1 == 14) then --BKSPACE
	 term.setCursorPos(1,4)
	 term.clearLine()
	 write("Password: ")
	 answer = ""
end
	elseif(event == "timer") then term.clear() term.setCursorPos(1,1) print("Going to sleep...") sleep(1) os.shutdown()
	end
end
print("")
print("")
if(answer == password) then print("Access Granted!") redstone.setOutput(door,true) sleep(3) os.shutdown()
else print("Access Denied!") sleep(1) rednet.broadcast("bye") os.shutdown() end

modem = "back"
trap = "front"
rednet.open(modem)
while(true) do
	event,param1,param2 = os.pullEvent()
	if(event == "rednet_message" and param2 == "bye") then redstone.setOutput(trap,true) sleep(3) redstone.setOutput(trap,false) end
end
print("hehe")

• Username entry (this is mostly just a novilty as the system automatically enters the username)
• Termination protection (Ctrl+T won't work)
• Failure events
• Server side password storage
• Password change without rebooting the server
• Simple installation (at least I believe it's simple)
• The word "cookies" in the code (come on, you know you love it)
• Reading my beautiful post

Robd, on 04 April 2012 - 12:08 AM said:

This is a very simple client/server program which allows for the user to make a terminal and a server (which holds and distributes the password.) The code is fairly simple but there are some interesting features that most door locks wouldn't include.

Code:

Spoiler

Server:

modem = "back"

rednet.open(modem)
term.clear()
term.setCursorPos(1,1)
print("Serving Password Requests...")
print("['q' to quit 'c' to change password]")
file = io.open("disk/password.txt","r")
password = file:read()
file:close()
answer = ""
while(true) do
	event,param1,param2 = os.pullEvent()
	if(event == "rednet_message" and param2 == "password") then rednet.send(param1,password)
	elseif(event == "char") then
if(param1 == "q") then break
elseif(param1 == "c") then
	 write("New Password: ")
	 while(true) do
  event,param1,param2 = os.pullEvent()
  if(event == "char") then
	  answer = answer..param1
	  write(param1)
  elseif(event == "key") then
	  if(param1 == 28) then -- ENTER
   break
	  elseif(param1 == 14) then -- Backspace
   x,y = term.getCursorPos()
   term.clearLine()
   term.setCursorPos(1,y)
   write("New Password: ")
   answer = ""
	  end
  end
	 end
	 file = io.open("disk/password.txt","w")
	 file:write(answer)
	 print("")
	 print("Password Changed to: "..answer)
	 password = answer
	 file:close()
	 answer = ""
end
	end
end

Client:

username = "Cookies19"
door = "left"
modem = "back"
os.startTimer(30) --go to sleep after 30 seconds (see event)
rednet.open(modem)
rednet.broadcast("password")
id,message = rednet.receive(5)
password = message
term.clear()
term.setCursorPos(1,1)
print("Terminal of Awesomeness")
print("***********************")
print("User Name: ")
write("Password: ")
term.setCursorPos(12,3)
textutils.slowPrint(username)
term.setCursorPos(11,4)
answer = ""
while(true) do
	event,param1,param2 = os.pullEventRaw()
	if(event == "terminate") then print("")print("")print("Now why on earth would I let you do that?") sleep(3) os.shutdown()
	elseif(event == "char") then
answer = answer..param1
write(param1)
	elseif(event == "key")
then
if(param1 == 28) then --ENTER
	 break
elseif(param1 == 14) then --BKSPACE
	 term.setCursorPos(1,4)
	 term.clearLine()
	 write("Password: ")
	 answer = ""
end
	elseif(event == "timer") then term.clear() term.setCursorPos(1,1) print("Going to sleep...") sleep(1) os.shutdown()
	end
end
print("")
print("")
if(answer == password) then print("Access Granted!") redstone.setOutput(door,true) sleep(3) os.shutdown()
else print("Access Denied!") sleep(1) rednet.broadcast("bye") os.shutdown() end

Installation:

Spoiler

Server:

1. Copy the above code into a file called "startup" and place it in a disk near the server
2. Set the variable "modem" to the side with your wireless modem
3. Create a file called "passwords.txt" on the same disk

Client:

1. Copy the above code directly to the system and call the file "startup"
2. Change the variables "username", "door", and "modem" to the apropriate states (door is a variable for the side the door is on)

Failure Event [Advanced]:

1. Create some kind of redstone powered mechanism to be activated on an incorrect password entry
2. Place a system near the contraption, to turn it on
3. Create a code like this and call it "startup" (you may also choose to put it on a disk near the system):

modem = "back"
trap = "front"
rednet.open(modem)
while(true) do
	event,param1,param2 = os.pullEvent()
	if(event == "rednet_message" and param2 == "bye") then redstone.setOutput(trap,true) sleep(3) redstone.setOutput(trap,false) end
end
print("hehe")

Note that "bye" is the failure message broadcasted by terminals.

Features:

• Username entry (this is mostly just a novilty as the system automatically enters the username)
• Termination protection (Ctrl+T won't work)
• Failure events
• Server side password storage
• Password change without rebooting the server
• Simple installation (at least I believe it's simple)
• The word "cookies" in the code (come on, you know you love it)
• Reading my beautiful post

As always, feedback is welcome

ArcaneShade, on 10 April 2012 - 01:50 PM said:

do you got any idea why the client comes up with this error message?
bios:206: [string "startup"]:29: 'end' expected
(to close 'if' at line 27)

Mrjoecool123, on 05 April 2012 - 01:31 PM said:

can you make it so it wont use a disk to store the password?

ArcaneShade, on 10 April 2012 - 08:46 AM said:

ok, so the usernames and passwords is stored on a 'server' (the server i s just a regular computer, right?) and then when you access another computer with the cilent code you will need to enter the right username/password combo?
so the password dosnt gets stored at the cilent it simply asks the server if the combo is correct?

did i get this right if so you have created the most awesome protection!

my_hat_stinks, on 20 May 2012 - 01:03 AM said:

So, if I'm right, you send the password to anyone who broadcasts "password"?

I've not used rednet at all yet, but… Well, isn't that very insecure?