NoCheatPlus
Detect and fight the exploitation of various flaws/bugs in Minecraft!
Introduction
NoCheatPlus attempts to prevent cheat clients from exploiting weaknesses of Minecraft or its protocol, making your server more safe. Checks cover a wide range of issues including flying and speeding, fighting hacks, fast block breaking and nukers, inventory hacks, chat spam and other types of malicious behaviour. For a more complete list have a look at the Features Page.
NoCheatPlus puts emphasis on configurability and allows you to customize actions that are carried out when a player fails a check (e.g. silent cancelling, executing commands, just logging). Bypass permissions allow to control what check to apply for which players, all checks can be deactivated in the configuration, also having the option for world-specific configuration files. Many checks allow more detailed configuration to adjust sensitivity.
Certainly NoCheatPlus is not a magical bullet, it uses a lot of heuristics and even guessing, so you will encounter false positives here and there and also not catch every single violation. Example video of how NoCheatPlus blocks cheats (outdated plugin version).
NoCheatPlus was introduced by NeatMonster, building on the code base of NoCheat by Evenprime.
Recommended
The following plugins might be useful to have a look at.
ProtocolLib
Allows NoCheatPlus to activate packet-level checks, covering a range of exploits that can't be monitored using ordinary means. Since roughly Minecraft 1.7.10, the fight.speed check can't work as expected anymore, due to changes in CraftBukkit. With ProtocolLib this can be repaired.
CompatNoCheatPlus (cncp)
Make plugins like mcMMO or MachinaCraft more compatbile with NoCheatPlus. Not all existing plugins are covered (yet), but you can leave a note or create an issue/ticket request for cncp. Phasing out: Citizens 2 should work with NCP out of the box, MagicSpells are working on compatibility too - rest will be integrated into NCP.
Orebfuscator
Orebfuscator fights all sorts of X-ray-hacks by altering the map information that is sent to the players, such that they have to mine blocks to actually reveal what is behind. Virtually a "must have". (Latest versions of Spigot contain features of Orebfuscator.)
Downloads and History of Changes
- Download officially approved versions on the Files page at BukkitDev.
- Development builds have been moved over to the Jenkins at md-5.net.
- Do not download from any other source, do not use jars other people send you.
- Change lists: Wiki (digest) | Jenkins (by build number) | GitHub (all commits).
- Source code
Plugin statistics are no longer reported to mcstats.org.
Support
Documentation Resources
- Consider first: Frequently asked Questions and Known Issues.
- Wiki (Configuration, Permissions, Commands)
- Developers might have a look at the page describing the API of NoCheatPlus.
Contact us
- Quick questions can be asked on this page,
or on IRC (Server: irc.spi.gt | Default-Port: 6667 | SSL-Port: 6697 | Channel: #nocheat | Web client: WebIRC) - For real issues or feature requests please create a new issue/ticket or add to an existing issue/ticket.
- To send information that is not to be seen by all, you can also reach us by PM to @asofold and @MyPictures. @IceAP (IRC: ICE) will also help or redirect the conversation. Please do not contact the user 'NoCheatPlus', it is for administrative purposes only and will likely not be answered in time. Keep to BukkitDev and GitHub for support, do not trust users on other forums or websites, also not if their nick names are the same as NCP staff on BukkitDev.
Please always state the output of the "ncp version" command to let us know versions in use (users of cncp also the "cncp" command).
Comments
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_ForgeUser9668734 Owner
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_ForgeUser15078623 Ticket Manager
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_ForgeUser16101223 Contributor
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_ForgeUser7091862 Former Author
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_ForgeUser7459264 Former Author
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Forge_User_61842651 Author
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MyPicturesCP Artist
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Posted Nov 2, 2012@ni_r3ng3r_ni
It appears your server runs out of memory. It can be related to NoCheatPlus, but in fact the pastie does not seem to give evidence that this is caused by NoCheatPlus directly.
Please keep to this ticket: http://dev.bukkit.org/server-mods/nocheatplus/tickets/308-out-of-memory/
Would be good to get some more information to be able to judge this issue.
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Posted Nov 2, 2012Hi, I have a big problem, server crashes randomly caused by nocheat :/ Error: click for pastie
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Posted Nov 1, 2012@TheWinningHit
Thanks. Aim-bots are difficult, because the client just tells that he is attacking a certain entity (or interacting), also the point of time the attack-packet arrives the entity has moved on anyway, without knowledge of even the aim-bot. We still can improve checks, but basically we can't do much more than finding some unlikely pattern in the moving+attacking behavior of a player and alert for that.
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Posted Nov 1, 2012This is awesome! I do not have to deal with anymore hackers. If only there were a way to stop aimbotters as well, possibly make it so that if they aim in one specific spot of a player long enough they could get kicked? I don't know! Either way this is really cool!
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Posted Nov 1, 2012@Glacksy
It is not a vanilla feature, so you have to adapt the settings to match Spout. I am not sure how many lines you can type in Spout, but you will have to increase the chat.text level settings, especially the shortterm one.
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Posted Nov 1, 2012attacking mobs seems to lag a lot, its also detecting chatting in spout, which let you type more than one line, and it will post it all in chat at once... its a feature and not a hack i believe?
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Posted Nov 1, 2012@andrewkm
@LordKainzo
Are you sure that is only related to NCP ?
Since 1.4.2 general performance seems to have dropped again by a good bit...
Also if you use development builds of PermissionsEx: one of the latest builds contains a change "concurrency for superperms" - i would advise to use a build before that for the moment unless you really need it and until someone has tested its performance.
I could use timings from "good times" and timings from now if you have any - any other kind of logs that might indicate anything are also welcome, probably pm if you are willing to share them. Currently i am taking timings with a 1.4.2 16 slot server to get some reference, i will further check the timings of less obvious events (not only moving) to get an impression what to optimize.
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Posted Nov 1, 2012@andrewkm
Yes please :( we're getting so bogged down these days that I think manually finding hackers may be the better route to go.
I'll try disabling the accounting check for flight and see if that improves. OnMove checks is horrid no matter what for a large server.
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Posted Nov 1, 2012@Maxetto
Thankyou verymuch for this comment!
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Posted Nov 1, 2012NoCheatPlus for 1.4.2 is Out!
Download it: http://dev.bukkit.org/server-mods/nocheatplus/files/34-nocheat-plus-3-8-0-rc-b207/
(Not Already Approved by Bukkit Team)
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Posted Oct 31, 2012@deathhzone
Build 205 is explicitely compiled with the beta of CB. 204 just matched the latest dev before it.
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Posted Oct 31, 2012@andrewkm
Show reports !
If possible also from differing versions, if you can state those.
Actually i am aware of some increase of timings for the moving checks. You might set survivalfly.accounting to false to spare small amounts, not sure if the most recent fly bypass attempts work better without it.
But we reduced some false positives which usually should be worse than a slight average timing increase. But i am not sure what versions and timings you refer to, i would have to have a look.
Obviously the optimizing iteration is still in the queue.
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Posted Oct 31, 2012Woah timings on NCP have gotten worse and worse. If youd like to see some reports asofold please pm me. Would love some performance work on NCP.
I would hate to start disabling checks; I love all the anti-cheat features of NCP but it may be my only option :(
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Posted Oct 31, 2012@deathhzone
Build 204.
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Posted Oct 31, 2012Are there any 1.4 versions made against the new Craftbukkit beta build for 1.4 yet?
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Posted Oct 31, 2012@asofold
Yep, welcome to the Team @TobSeb :)
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Posted Oct 31, 2012We added @TobSeb as Tester and Ticketmanager officially, welcome to the team!
He will help with testing and tickets.
We should also mention that we are grateful for all that also run the development builds and report bugs and problems, it is a great help.
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Posted Oct 31, 2012@doggyroc
Probably you were just unlucky to download the backport version for 1.3.1 in the short window while the new 1.4.2 version coming right after it was not yet built. In any case from now on there should be no further backport versions for 1.3.1. To avoid trouble like this, you should click on the build number to see the change for that build before downloading, or you have a look at the recent-changes list. Such versions will be just singular builds, with a clear description of the game version and that it is a backport, also they will be followed by a build for the current version always.
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Posted Oct 31, 2012@asofold
Oh, I thought I was using the dev builds. Sorry about that.
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Posted Oct 30, 2012@winter4w
Why do you paste such a long log?
Please use a paste, there is a link on top of the page for well working paste, then just add the link here.
And if you would read either comments or the 1.4 note on top of the page (RED BOLD LETTERS), then you would probably know what to download.