NoCheatPlus

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NoCheatPlus

Detect and fight the exploitation of various flaws/bugs in Minecraft!

Features Permissions Commands Configuration Jenkins

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 Example video of how NoCheatPlus blocks cheats (outdated plugin version).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.

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, Citizens, MagicSpells 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.

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

Support

Documentation Resources

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).

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  • Avatar of baksovic111 baksovic111 Mar 25, 2014 at 12:45 UTC - 0 likes

    [07:58:00] [Server thread/ERROR]: [NoCheatPlus] JoinLeaveListener(fr.neatmonster.nocheatplus.checks.moving.MovingListener) generated an exception (join): NullPointerException [07:58:00] [Server thread/ERROR]: java.lang.NullPointerException at fr.neatmonster.nocheatplus.checks.moving.MovingData.hasSetBackWorldChanged(MovingData.java:390) at fr.neatmonster.nocheatplus.checks.moving.MovingListener.playerJoins(MovingListener.java:1184) at fr.neatmonster.nocheatplus.NoCheatPlus.onJoinLow(NoCheatPlus.java:1043) at fr.neatmonster.nocheatplus.NoCheatPlus$7.onPlayerJoinLow(NoCheatPlus.java:1000) at sun.reflect.GeneratedMethodAccessor470.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:318) at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30) at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:487) at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:472) at net.minecraft.server.v1_7_R1.PlayerList.c(PlayerList.java:245) at net.minecraft.server.v1_7_R1.PlayerList.a(PlayerList.java:135) at net.minecraft.server.v1_7_R1.LoginListener.c(LoginListener.java:87) at net.minecraft.server.v1_7_R1.LoginListener.a(LoginListener.java:42) at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:150) at net.minecraft.server.v1_7_R1.ServerConnection.c(ServerConnection.java:77) at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:700) at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:273) at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:562) at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:469) at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)

  • Avatar of asofold asofold Mar 24, 2014 at 23:48 UTC - 0 likes

    @chsedv: Go

    Development build 676 contains a module for 1.7.5. I have shortly reviewed Minecraft changes related to it, but it is not much tested yet. Also it contains not too much tested alterations to some fight checks.

    BFAK:asofold,90573112,4305cd44b773216e4e4b4865b3831dcc3c507c15087fb5cfeebd9392050724fc

    NoCheatPlus
    Latest beta release (1.8.x, this site) 3.13.0-BETA-sMD5NET-b878
    (Development builds, 1.8.x: Jenkins)

  • Avatar of MyPictures MyPictures Mar 24, 2014 at 21:02 UTC - 0 likes

    @RedZephon9: Go

    No way to really support them. That mod technically is a "cheat" because it can move items around inventories at insane speed. I recommend to disable or give those players the permission to bypass the FastClick check if you want to allow them using InvTweaks.

    BFAK:MyPictures,68804,4095b7e13e1842a5c6922a5b3a9094d1f7dbb5f4e7e36f133280ab58fa2882b0

  • Avatar of RedZephon9 RedZephon9 Mar 24, 2014 at 20:29 UTC - 0 likes

    Is there anyway to add support for inventory sorting programs? They are getting caught by no cheat + but my server wants to allow those plugins.

  • Avatar of asofold asofold Mar 24, 2014 at 19:25 UTC - 0 likes

    @chsedv: Go

    I will update for CraftBukkit, might make it in a couple of hours (not due to the complexity of the task itself). It will be a development build, and there will be changes to the fight.reach and fight.direction checks, which i can not 100% predict as of now. Beta or full release will be around thursday, most likely.

  • Avatar of chsedv chsedv Mar 24, 2014 at 15:16 UTC - 0 likes

    Pls update to Craftbukket or Spigot 1.7.5-R01

  • Avatar of asofold asofold Mar 24, 2014 at 13:15 UTC - 0 likes

    @Wizel603: Go

    For an individual player this could be annoying, because some servers have skill-plugins like mcMMO which allow leveling something with taking fall damage.

    Also false positives are possible for players trying something difficult, e.g. to retrieve their items (desperately). Also thinkable that they do it with lava, not sure that would need more clients for real spamming.

    It certainly is possible to set the death message to *nothing* for the case of repeated equaling death messages or causes, as an add-in. The kicking is possible too, but might have to be deactivated by default.

    Should probably make a ticket for better discussion with others.

  • Avatar of Wizel603 Wizel603 Mar 24, 2014 at 10:26 UTC - 0 likes

    Is there anything ncp can do against death spamming? The latest I've seen on my server is a hacked client will connect and the client will start causing "... fell from a high place" messages at a rate of every 5 seconds, indefinitely. When several players are doing this at the same time it of course multiplies the problem.

    To make matters worse, this activity appears to cause the server to continuously generate a very large amount of outbound traffic for each spamming client during this time, which can flood the server's connection to the point of affecting all players even if they are ignoring chat.

    One thing that comes to mind would be to add a respawn timeout to ncp (in a similar style to ncp's relog timeout) which will kick a player if they continue to respawn too fast.

  • Avatar of asofold asofold Mar 22, 2014 at 23:01 UTC - 0 likes

    @istegosaurus3: Go

    Well i don't exactly know what their settings are, and what exactly the data was, on base of which you were banned for.

    In general i would not ban for checks that are affected by network delay too much.

    If however you reach a very high violation level (constantly...) with the improbable check, then you might indeed be cheating, with a not too much adapted cheat client - still rare reports of false positives even for that check (some stuck-in-something loop) show that banning is very much a two-sided blade thing.

    Basically i suggest they check the data and settings for if those might be prone to lag (network or server) - i could offer some assistance over BukkitDev/pm for them.

  • Avatar of streetkilln streetkilln Mar 22, 2014 at 21:30 UTC - 0 likes

    @asofold: Go

    somthing similar like that but players cant shut the doors at al they can open and close but then it randomly gets stuck..

Facts

Date created
Apr 02, 2012
Categories
Last update
Jan 31, 2016
Development stage
Release
License
GNU General Public License version 3 (GPLv3)
Curse link
NoCheatPlus
Reverse relationships
4
Downloads
1,437,385
Recent files

Authors

Relationships

Optional dependency
ProtocolLib