Ultimate Door Lock - PDA Opened Doors!

Screenshots

The settings page (door computer)


The normal door computer screen


The Pocket Computer screen.

pastebin get 4QeAEiTM startup

awsmazinggenius, on 23 March 2014 - 06:39 PM said:

What if you are killed in PvP, and someone grabs your PDA when you drop your stuff? Also, does this require advanced computers? (I only took a tiny look at the source). If so, you should port it to normal computers (press r to register a PDA, for example) because those are cheaper to craft.

Also, about the PDA death issue, if you choose to use an RFID or Mag-Strip card to log on (I ditched awsmazingOS before the PDAs, even the ones with no modems, and if you use terminal glasses, your username can be checked), awsmazingOS will occasionally ask you for a password to ensure security. I recommend you implement something similar, as well as require a password to register/delete PDAs, as there are people that don't know any better than to put the computer right next to their door like a normal door lock.

awsmazinggenius, on 24 March 2014 - 06:05 AM said:

Also, when you add a new PDA, it would be nice if you could give it a name for the list, so that you could delete individual PDA's. Say if. I got killed and dropped my tablet, then another friend on the server could delete my PDA while keeping everyone else's intact.

CometWolf, on 24 March 2014 - 08:26 AM said:

Logically you would name it the same as your username :P/>

Apemanzilla, on 24 March 2014 - 01:03 PM said:

I feel like the "opening distance" settings should be Close, Normal, and Far instead of Small, Normal, and Far. Might just be me :P/>

Apemanzilla, on 24 March 2014 - 01:03 PM said:

I feel like the "opening distance" settings should be Close, Normal, and Far instead of Small, Normal, and Far. Might just be me :P/>

cutyehair104, on 25 March 2014 - 03:13 AM said:

This is the first time that I have EVER clicked on a door opening program. It looks very useful, especially with a large piston door. I like the GUI and the fact that it's easy to use for anyone. I just HAVE to check this out!

oeed, on 25 March 2014 - 03:29 AM said:

cutyehair104, on 25 March 2014 - 03:13 AM said:

This is the first time that I have EVER clicked on a door opening program. It looks very useful, especially with a large piston door. I like the GUI and the fact that it's easy to use for anyone. I just HAVE to check this out!

Thanks!

cutyehair104, on 25 March 2014 - 01:49 PM said:

oeed, on 25 March 2014 - 03:29 AM said:

cutyehair104, on 25 March 2014 - 03:13 AM said:

This is the first time that I have EVER clicked on a door opening program. It looks very useful, especially with a large piston door. I like the GUI and the fact that it's easy to use for anyone. I just HAVE to check this out!

Thanks!

You're welcome. I was looking through your code (I'm not even close to a pro at Lua), and I was wondering, how do you actually send messages with the pocket computer? What I think that I'm seeing in there is interfacing with the modem using the modem API. Is there any other way to do this? And if this is the only way, how exactly would I use it? Please pardon me for being a very dumb coder.

Csstform, on 25 March 2014 - 06:00 PM said:

Vibration!!!

Im currently envisioning 2 players reading some signs, when one starts jiggling…. the other is like: "Dude, too much sugar?" Meanwhile, the first guy is like, "My screen is shaking so much, I cant find my dang PC!!"

Or, you are just chatting on skype, when *ding*. What the heck was that!!!!

-snip-

oeed said:

I know Dan was planning to add pocket.vibrate and pocket.beep (or something along those lines), has he done that yet or is it still a maybe?

cutyehair104, on 25 March 2014 - 11:48 PM said:

-snip-

Yeah, I'm sorry, I guess I still don't understand exactly how you do it. Are you interfacing with the wireless modem directly? Is there any easier way to do this? I know that I tried using Rednet, as I thought that it would work, to no avail. Should I use the peripheral API instead and interface directly? Perhaps the modem API? Thank you SOOOO much for your help. You are literally the only person helpful! I've found no documentation anywhere regarding pocket computers except for in your programs. Did some more digging in your Wireless 'class' and I figured it out. Thank you SOOOOO much for your help! It is much appreciated.

oeed said:

I know Dan was planning to add pocket.vibrate and pocket.beep (or something along those lines), has he done that yet or is it still a maybe?

On his Twitter, he stated that he liked the idea, although I tried it in the most recent update, pr7, it does not work. I don't know if he's going to put it in either.

theoriginalbit, on 27 March 2014 - 11:58 PM said:

So congrats on being the first program in "Pocket Programs" :)/>

If you have OneOS running on your PDA

Lyqyd, on 29 March 2014 - 09:28 PM said:

I added a feature to pocketgps to enable compatibility with this program. It works pretty flawlessly, but I noticed that your program sometimes doesn't like packets that come in as tables. You may want to add some additional type checking to disallow other rednet traffic from screwing up the system. Also, just wanted to let you know that you can send tables as tables in more recent versions of ComputerCraft, including 1.6.

Sxw, on 31 March 2014 - 01:03 AM said:

Is there anything keeping others from rebroadcasting the fingerprint to open the door?

oeed, on 31 March 2014 - 03:51 AM said:

Sxw, on 31 March 2014 - 01:03 AM said:

Is there anything keeping others from rebroadcasting the fingerprint to open the door?

No. There's really nothing I can think of that can prevent others from mimicking another PDA. ComputerCraft is very open, even if I did encrypt everything you could still fairly easily reverse it.

If you have any suggestions let me know. I'm trying out the program on the CoderCraft server and haven't run in to any issues as of yet.

Graypup, on 31 March 2014 - 04:43 AM said:

oeed, on 31 March 2014 - 03:51 AM said:

Sxw, on 31 March 2014 - 01:03 AM said:

Is there anything keeping others from rebroadcasting the fingerprint to open the door?

No. There's really nothing I can think of that can prevent others from mimicking another PDA. ComputerCraft is very open, even if I did encrypt everything you could still fairly easily reverse it.

If you have any suggestions let me know. I'm trying out the program on the CoderCraft server and haven't run in to any issues as of yet.

Simple. Shared secret. Server sends a challenge (RANDOM), server encrypts it, without sending the encrypted version, client encrypts it, server checks whether it's the same as its own encryption. Just grab some lua implementation of a cipher, and add the 10 lines of code necessary

amtra5, on 31 March 2014 - 05:57 AM said:

Graypup, on 31 March 2014 - 04:43 AM said:

–snip–

Simple. Shared secret. Server sends a challenge (RANDOM), server encrypts it, without sending the encrypted version, client encrypts it, server checks whether it's the same as its own encryption. Just grab some lua implementation of a cipher, and add the 10 lines of code necessary

The shared key would have to be distributed beforehand in the program, where it could be easily copied from

6677, on 31 March 2014 - 11:59 AM said:

even on short range, just run in with the person opening the door :P/>

6677, on 31 March 2014 - 11:59 AM said:

even on short range, just run in with the person opening the door :P/>

awsmazinggenius, on 01 April 2014 - 02:26 AM said:

How about a shared secret that gets shared when the PDA is first inserted into the drive to sync it. Would that work? I haven't looked at PDAs in drives much yet.

Graypup, on 31 March 2014 - 04:43 AM said:

Simple. Shared secret. Server sends a challenge (RANDOM), server encrypts it, without sending the encrypted version, client encrypts it, server checks whether it's the same as its own encryption. Just grab some lua implementation of a cipher, and add the 10 lines of code necessary

oeed, on 31 March 2014 - 07:56 AM said:

Even if you entered a password specific to that server, you could just copied the message the PDA sent and send that.

oeed, on 01 April 2014 - 03:21 AM said:

But the issue is, if you can record the message the PDA sent you can easily mimic it.

Apemanzilla, on 01 April 2014 - 03:40 AM said:

How about this:
…

Apemanzilla, on 01 April 2014 - 03:40 AM said:

How about this:

Insert PDA into drive connected to door lock computer. Enter PDA ID into computer. Computer then generates a key file and stores it on the PDA along with the door opener program. The key stored on the PDA is used to generate a hash that changes each time a new one is generated. Eg:
PDA and lock both have a record of the key and a record of how many times that key has been used. Every time the door is opened, the PDA generates a hash based on the key and number of usages, then sends it to the lock. The lock generates a hash with the same parameters, checks if they're equal and confirms it with the client. The amount of usages is then incremented by one on both devices so the next hash is different and the prior one is invalid.

That's about as safe as you could get with CC rednet.

MaHuJa, on 01 April 2014 - 04:15 AM said:

Graypup, on 31 March 2014 - 04:43 AM said:

Simple. Shared secret. Server sends a challenge (RANDOM), server encrypts it, without sending the encrypted version, client encrypts it, server checks whether it's the same as its own encryption. Just grab some lua implementation of a cipher, and add the 10 lines of code necessary

oeed, on 31 March 2014 - 07:56 AM said:

Even if you entered a password specific to that server, you could just copied the message the PDA sent and send that.

oeed, on 01 April 2014 - 03:21 AM said:

But the issue is, if you can record the message the PDA sent you can easily mimic it.

That you miss it even after graypup hands you the solution on a silver platter, is slightly worrisome.
Did you just give up prematurely?

You talk about CC being "open" - but it is perhaps less so than the computers and networks outside of minecraft.
Even then "playback attacks" are a solved problem. We know the solutions. They apply just as well in CC.

I discovered this in the code:
for _ = 1, 256 do
local char = math.random(32, 126)
–if char == 96 then char = math.random(32, 95) end
str = str .. string.char(char)
end
Look up table.concat and why it exists.

Lyqyd, on 29 March 2014 - 09:28 PM said:

Also, just wanted to let you know that you can send tables as tables in more recent versions of ComputerCraft, including 1.6.

SuicidalSTDz, on 01 April 2014 - 05:08 PM said:

Lyqyd, on 29 March 2014 - 09:28 PM said:

Also, just wanted to let you know that you can send tables as tables in more recent versions of ComputerCraft, including 1.6.

Did Dan forget to put this in the changelog? I knew people were talking about it a while ago in the IRC channel but I didn't see it documented anywhere.

McDonald072, on 01 April 2014 - 03:41 PM said:

How does this work? Does the PDA send "open the door" to the computer? If so, how do you limit the range of the modems?

oeed, on 01 April 2014 - 09:57 PM said:

I'm currently planning to change the authentication method using the one above, however, to make it more secure.

Lyqyd, on 02 April 2014 - 01:44 AM said:

oeed, on 01 April 2014 - 09:57 PM said:

I'm currently planning to change the authentication method using the one above, however, to make it more secure.

I was really hoping to not see you say this. Oh well, it was nice to include support in pocketgps while I could.

Lyqyd, on 02 April 2014 - 02:16 AM said:

Well, I suppose the problem is more philosophical than technical. I don't think that adding further "security" is going to have any benefit beyond the fingerprint system already in place. We're talking about setting up complex, resource-intensive cryptography systems for a Minecraft door lock. These are not usually operations that are cheap to perform, time-wise. Sure, it's possible to create a more secure system, but on many servers, the other person could also just walk in and break your door. So, with the ease of access in the physical minecraft world and the difficulty/time cost of cryptographic security in ComputerCraft, I've always felt that it simply isn't worth it to include much security in applications. PocketGPS currently supports the door lock compatibility with 18 lines of code, and I have the feeling that that would balloon tremendously if a cryptographic security scheme was added.

oeed, on 02 April 2014 - 02:51 AM said:

I do agree with you completely, I'm commonly stating that security in ComputerCraft is virtually worthless, it's more the fact that people are worried about it. I'll take a look at the PocketGPS code and see issues are involved.

Edit: Oh, I see, you've added a function that essentially works as the pocket computer program. I was thinking that it was interfering with modem messages or something. In that case I'll leave it as it is. The disadvantages outweigh the advantages.

Apemanzilla, on 02 April 2014 - 01:11 PM said:

@oeed, you could provide an API for the door lock :P/>

Lyqyd, on 02 April 2014 - 02:16 AM said:

We're talking about setting up complex, resource-intensive cryptography systems for a Minecraft door lock.

These are not usually operations that are cheap to perform, time-wise.

… door lock compatibility with 18 lines of code … balloon tremendously …

MaHuJa, on 04 April 2014 - 04:20 AM said:

–snip–

wojbie, on 13 April 2014 - 06:39 PM said:

@Sxw - he is using modem api not rednet api - repeater would not pass message on.

CastleMan2000, on 26 April 2014 - 09:13 PM said:

Could you also make the program compatible with regular wireless pocomps? I don't have any advanced ones :/

CastleMan2000, on 27 April 2014 - 06:29 PM said:

I tried it and it didn't seem to :/

SovietRussianSpy, on 20 July 2014 - 09:42 PM said:

This pastebin is telling me No such program… It was working and then it stopped.

Tombot44, on 22 July 2014 - 10:04 AM said:

Maybe make something that you can attach a monitor to the door opening computer and it show the status of the door, and maybe even something on the monitor for a second redstone output with the name Lights so we could have lights and door status.

ninja4523, on 22 November 2014 - 12:50 AM said:

This is a nice program but it would be nice if there was an option to choose whether or not you want doors to open when you get close to them. Also if you made an option to use the PDA as a limited access system that allows users to only access certain areas of the owner's base then that would be very cool.

aoi222, on 28 April 2014 - 02:41 PM said:

First off, love the program, keep up the great work.

I had a couple suggestions that I noticed while playing around with the program.

1) The program doesn't play nice with external monitors unless you make them 5x3 or larger. It would be awesome if it could scale the GUI a bit based on the size of the monitor. Alternatively, direct support for an external monitor that just displays status information could be useful as well.

2) If you have a wired modem connected, which is again useful for connecting external monitors, there can be issues with the program not finding the wireless modem (depending on which side it is attached to).

oeed, on 27 April 2014 - 12:28 AM said:

CastleMan2000, on 26 April 2014 - 09:13 PM said:

Could you also make the program compatible with regular wireless pocomps? I don't have any advanced ones :/

Yea it does work with regular computers.

cygnis, on 14 February 2015 - 09:59 PM said:

oeed, on 27 April 2014 - 12:28 AM said:

CastleMan2000, on 26 April 2014 - 09:13 PM said:

Could you also make the program compatible with regular wireless pocomps? I don't have any advanced ones :/

Yea it does work with regular computers.

I haven't been successful in getting it to work with a regular computer. It just keeps telling me it requires an advanced one.

else
	 print('Ultimate Door Lock requires an advanced (gold) computer or pocket computer.')
end

Spoiler

oeed, on 24 March 2014 - 08:36 AM said:

CometWolf, on 24 March 2014 - 08:26 AM said:

Logically you would name it the same as your username :P/>

It just makes the setup process harder really, if I find a public 1.6 server I'll try it out there and see if there's a need.

Update 1 Released

This update adds support for non-advanced computers. Both PDAs and computers will work with out colour screens. This is the first time I've actually made a non-advanced computer GUI, so it's been a bit of an experiment to get it working at an acceptable level of usability. The key in square brackets is they key you press to click the button.


There may be a few bugs related to this, if you do find anything let me know.

GravityScore, on 23 March 2014 - 02:15 PM said:

Been a while since I clicked on a link to a door lock program! :P/> Great job, looks awesome. Time to test it out.

You need a wireless modem!

unpack = table.unpack

unpack = unpack or table.unpack