Inactive [SEC] NoCheat v3.5.0 [CB 1.2.4 R1.0][ABANDONED]

Evenprime · Feb 15, 2011

click this >> Get It here << click this

Clavus · Jul 9, 2011

Evenprime said: ↑

I don't think one can produce severe violations by doing that. You could look through your logs to find the corresponding message and check if the locations written there are at water/land, matching their stories or not. Beyond that I can't really help with that. If you are using older versions of CraftBukkit/NoCheat, it could also be a bug that was fixed already.
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I'm on the first functional CraftBukkit for MC 1.7.3, and I installed NoCheat two days ago (1.07c). These are the log lines on which I based the ban:

11.07.09 21:56:18 [WARNING] NC: Moving violation: aWhiiteeKiid from world (-900.7, 127.4, 133.1) to (-901.7, 130.4, 133.0) distance (1.0, 3.0, 0.1)
11.07.09 21:56:18 [SEVERE] NC: Moving violation: aWhiiteeKiid from world (-901.7, 130.3, 133.0) to (-902.7, 133.3, 132.9) distance (1.0, 3.0, 0.1)
11.07.09 21:56:23 [SEVERE] NC: Moving summary of last ~5 seconds: aWhiiteeKiid total Violations: (0,1,1)
11.07.09 21:56:23 [WARNING] NC: Moving violation: aWhiiteeKiid from world (-901.7, 127.9, 128.5) to (-902.7, 130.9, 128.5) distance (1.0, 3.0, 0.0)
11.07.09 21:56:24 [SEVERE] NC: Moving violation: aWhiiteeKiid from world (-902.8, 130.8, 128.4) to (-903.8, 133.8, 128.4) distance (1.0, 3.0, 0.0)
11.07.09 21:56:28 [SEVERE] NC: Moving summary of last ~5 seconds: aWhiiteeKiid total Violations: (0,1,2)
11.07.09 21:56:30 [SEVERE] NC: Moving violation: aWhiiteeKiid from world (-901.7, 128.6, 129.0) to (-902.7, 131.6, 129.1) distance (1.0, 3.0, 0.1)
11.07.09 21:56:32 [WARNING] NC: Moving violation: aWhiiteeKiid from world (-900.7, 125.6, 130.0) to (-901.0, 128.6, 131.0) distance (0.3, 3.0, 1.0)
11.07.09 21:56:35 [SEVERE] NC: Moving summary of last ~5 seconds: aWhiiteeKiid total Violations: (0,2,7)
11.07.09 21:56:45 [WARNING] NC: Moving violation: aWhiiteeKiid from world (-900.7, 125.4, 129.1) to (-901.7, 128.4, 129.1) distance (1.0, 3.0, 0.0)
11.07.09 21:56:46 [SEVERE] NC: Moving violation: aWhiiteeKiid from world (-902.7, 131.3, 129.1) to (-903.7, 134.3, 129.1) distance (1.0, 3.0, 0.0)
11.07.09 21:56:50 [SEVERE] NC: Moving summary of last ~5 seconds: aWhiiteeKiid total Violations: (0,2,5)
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His mates blame it on a combination of lag and the water jumps. I just like your opinion on the chance of this being a false positive.

Evenprime · Jul 9, 2011

Clavus said: ↑

I'm on the first functional CraftBukkit for MC 1.7.3, and I installed NoCheat two days ago (1.07c). These are the log lines on which I based the ban:

His mates blame it on a combination of lag and the water jumps.
Click to expand...

In that case I'd say flyhack, 100% sure.

1. A normal jump in Minecraft only gets you a height of about 1.4 blocks, split over multiple smaller movements (typically 3-4 moves of ~0.1-0.7 blocks upward movement each - it varies a bit). So there is simply no legal way to just jump 3.0 Blocks upwards in one move.
2. He tried over and over again, in each case moving exactly 3.0 blocks up. Even if there were some weird combination of lag and whatever that would allow him to go that high, there should be at least some variety in the numbers.

zolcos · Jul 9, 2011

Speedhack seems to still work on my server with this mod. I saw a player moving faster than normal (about the max minecart speed) -- he says he's not using a timing speedhack, but rather using zombe's flight mod and flying along the ground.
Now, flying does cause players to be kicked, but only when they fly up. So it can still be used for fast horizontal movement.
Any idea what this problem may be?
Bukkit 953, NoCheat v1.08b

fffizzz · Jul 9, 2011

Evenprime said: ↑

I'm not sure I understand what you want. Do you mean something like e.g. a permission "nocheat.flying.worldname", with "worldname" being one of the worlds you have? Such that you could use a Permissions-plugin that doesn't have multi-world support?
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I guess it wouild be like this
you add like nocheat.allowflight to whatever world permissions file you want for a user or group, this would allow them to bypass the nocheat fly detection, but ONLY on that world.

Evenprime · Jul 10, 2011

fffizzz said: ↑

I guess it wouild be like this
you add like nocheat.allowflight to whatever world permissions file you want for a user or group, this would allow them to bypass the nocheat fly detection, but ONLY on that world.
Click to expand...

That *should* work already, but there may be a short delay, because NoCheat will check the permissions of players only at most every 10 seconds for performance reasons.

@Malchus :
@zolcos :

The fast horizontal movement should now work no longer. The check that does this works now different. First I adapted the expected distances per move to the newer bukkit version, and second it now works based on a simple heuristic. Each time a player makes a move that's further than the expected value, the difference gets added to a variable X. Only if X > 1, the bad move will be counted as a violation. In addition, with every move X gets reduced by 3%. This combination seems to work out pretty well to silently "swallow" bad moves that may be the result of lag or special cornercases, while still catching real cheating. A nice side effect is that permanent small cheating will keep X growing, and therefore the violation level will also grow.

I tested it with zombe's and a multiplier of 1.2, and (after a short time running around) it got detected.

Version 1.08c (for CB 953+)

Rewritten moving check to catch sprinting mods (like Zombe) with speed multipliers set to ~1.2 or more

efstajas · Jul 10, 2011

Zombes FlyMod seems to send something to the server when it's being activated, because, on some servers, I can't activate it and the server directly says "Zombes FlyMod is not allowed on this server". Which plugin is that, or is it that one?

Edit.: If it is that one, can I allow the FlyMod only for a certain world? I have some creative worlds and some survival ones.

jeanpoivrot · Jul 10, 2011

by turning ON fly in server.properties, don't that allow fly mod work in our servers ? or Nocheat still send that info to fly mod who respect that propertie ?

pyros · Jul 10, 2011

efstajas said: ↑

Zombes FlyMod seems to send something to the server when it's being activated, because, on some servers, I can't activate it and the server directly says "Zombes FlyMod is not allowed on this server". Which plugin is that, or is it that one?
Click to expand...

I would quite like this plugin also if anyone knows the name

Is it possible to set multiple custom actions for actions? Im looking to increase severity of warning automatically with the amount of and cant seem to find any documentations on it. I do have the customactions set up, just need to implement them

Also, I seem to be getting a number of false positives lately (at least, the users claim not to have mods), with just 1 (usually medium) alert, is there anyway to ignore these?

Evenprime · May 9, 2016

efstajas said: ↑

Zombes FlyMod seems to send something to the server when it's being activated, because, on some servers, I can't activate it and the server directly says "Zombes FlyMod is not allowed on this server". Which plugin is that, or is it that one?

Edit.: If it is that one, can I allow the FlyMod only for a certain world? I have some creative worlds and some survival ones.
Click to expand...

lemachinbidule said: ↑

by turning ON fly in server.properties, don't that allow fly mod work in our servers ? or Nocheat still send that info to fly mod who respect that propertie ?
Click to expand...

NoCheat doesn't send stuff to client mods like Zombe's flymod. That is done by plugins that set/change the "Message Of The Day". Whenever somebody with Zombe's mod connects to a server, Zombe's mod will read the MotD and search for the text "no-z-fly" and "no-z-cheat" in it. If it finds one of them, it disables the corresponding functionality of itself.
Alternatively to "no-z-fly" and "no-z-cheat" the MotT can contain colorcodes like "&f &f &2 &0 &4 &8" (you'll have to look in the thread of Zombe's mod to find out the correct ones - I don't know them) to invisibly instruct the client to deactivate the cheats.

EDIT: This of course only works with client mods that respect these values. It doesn't really prevent flying/cheating.

Allowing flying in server.properties by setting "allow-flight=true" just deactivates minecrafts builtin flight prevention. NoCheat will still do its own flight prevention, unless you deactivate that too in the "plugins/NoCheat/nocheat.yml" file.

pyros said: ↑

Is it possible to set multiple custom actions for actions? Im looking to increase severity of warning automatically with the amount of and cant seem to find any documentations on it. I do have the customactions set up, just need to implement them

Also, I seem to be getting a number of false positives lately (at least, the users claim not to have mods), with just 1 (usually medium) alert, is there anyway to ignore these?
Click to expand...

For the first question: Yes, you can have as many custom actions attached to one line in the config file as you want.
Code:
moving:
    actions:
        low: loglow cancel nicewarning notsonicewarning strongwarning gtfo

customactions:
    nicewarning: "[2,false] tell [player] Please stop that"
    notsonicewarning : "[4,false] tell [player] I said: Stop that"
    strongwarning: "[7,false] tell [player] You'll get kicked if you don't stop"
    gtfo: "[10,false] kick [player] You've been warned!"
For the second: No, not really. This will be possible in the newer version of NoCheat. Changing this in the old version would be too much work as it would require huge changes to the codebase. But if the player can describe where and why it happened I could see if I maybe can fix that.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

morizuki · Jul 10, 2011

are there really no fix for the invisible when you've teleport like the MobArena??

Evenprime · Jul 10, 2011

morizuki said: ↑

are there really no fix for the invisible when you've teleport like the MobArena??
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I actually didn't know that is still a problem. I thought players being invisible after teleports was fixed back in the CB ~700 versions somewhere.

morizuki · Jul 10, 2011

Evenprime said: ↑

I actually didn't know that is still a problem. I thought players being invisible after teleports was fixed back in the CB ~700 versions somewhere.
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nope.. it's still here.. just try the MobArena (teleporting to arena) and it invisible us.. when I remove the NoCheat.. it's ok again..

Evenprime · Jul 10, 2011

morizuki said: ↑

nope.. it's still here.. just try the MobArena (teleporting to arena) and it invisible us.. when I remove the NoCheat.. it's ok again..
Click to expand...

Do you get any logs from NoCheat when this invisibility happens? Like "moving" violations? The only thing I can think of right away is to set the option "enforceteleport=true" in the NoCheat configuration file and see what happens if you do that.

I'll try to find out what else could be wrong in the meantime.

o0AzzA0o · Jul 10, 2011

Evenprime said: ↑
NoCheat - Detect and Fight the exploitation of various Flaws/Bugs in Minecraft

Latest Versions:
v1.08c for CraftBukkit RB #953 (and probably newer)
v1.06b for CraftBukkit RB #935
v1.05c for CraftBukkit RB #860

Why this plugin exists:

Minecraft was written with a strong focus on singleplayer, which means most of its code assumes a trustworthy user. This is a big problem for multiplayer games, where the server should never trust the client (player). Team Mojang tried to fix at least some of these problems in the past by moving control piece by piece from the client to the server (most famous example is storing the players inventory only at the server to prevent the player from tampering with it) and the Bukkit developers do a good job with patching the holes left (e.g. preventing item duplication by death), some of these problems go deeper and are at their core design problems that can't be fixed without rewriting huge parts of Minecrafts server and client code.

This is where my NoCheat plugin comes into play. Problems like players flying, teleporting without authorization, walking through walls, running fast and speedhacking by modifying the tickrate of their client are basically design problems with no real way to fix, but that can be identified with very good accuracy and/or limited greatly in their effectiveness. Read the following section to learn more about the problems and how I tackle them.

The problems and their solution(s) (open)

The problems, their consequences and their solution(s):

Short Version: There are 5 problem categories currently treated by my plugin.

moving includes flying, running, clientside teleporting, walking through walls.
speedhack running really fast by e.g. manipulating the system clock
airbuild placing blocks in midair
bogusitems Itemstacks with amount smaller or equal to 0 can be used to create infinite legit copies of the item and/or can be used infinitely often
nuke Players will use custom clients to destroy large areas around themselves automatically or extend their reach

These six problem groups are handled by checks (with identical names) within my plugin.

Long version (open) Long version (close)

Moving Problem: Trusting the client(s) movement calculations

The client calculates the players movement (walking, jumping, crawling, swimming,...) all by it self and just sends the server the result of that calculation (the new x,y,z location of the player). This prevents the server from reconstructing what happened on the players computer and it therefore has to trust the player.

Consquences: Flying, Running, fake sneaking, walking through walls (noclip), teleporting

A client can outright lie about the new player location, the server doesn't care at all. The client can just modify the y-coordinate (height) to allow players to float/fly, it may modify the x,z-coordinates to allow the player to do bigger steps, it may ignore all clientside checks that normally prevent the player from walking through walls (noclip) or just set the coordinates to a far away location that the player wants to "teleport" to.

Solution: Don't believe the client if what it claims can't be true

Pretty easy, isn't it? It isn't. The server gets absolutely no information from the player except for the new coordinates. No information about the player pressing the jump/forward/backward button, the crawl button, nothing. Therefore my plugin has to first guess what action a player did, then calculate if the new position of the player can be the result
of that action. If it comes to the conclusion that the players move was not possible, a violation level is chosen depending on how far off the new player position is from the closest plausible location. The server admin can decide what happens for each level, usually teleporting the player back to where he was before and/or logging the incident.

Speedhack Problem: The server has no working lag handling strategy

Usually a player sends no more than one move packet with new player x,y,z coordinates to the server within 50 ms ( = 1 tick ). That means a total of 1 packet per tick or 20 packets per second per player maximum. The server however accepts an arbitrary amount of such packets. Movement in Minecraft is calculated solely on a per-tick basis.

Consquence: Speedhack

The client can increase its number of ticks per second to allow a player to effectively move faster, while still staying within plausible limits for movement from move packet to move packet. This can be done by either modifying the game client itself, or use one of the lamest tricks ever, setting your system clock forward while the game is running (no longer works).

Solution: Limit the number of accepted move packets per second

Again, this sounds easier than it is, because there are legitimate situations that would cause the server to receive more move packets than the usual 20 per second per player. Some of these are: "void-diving" (a player falling into an unloaded chunk), using a boat in combination with a water elevator, but also non-software problems like a faulty internet connection delaying packet delivery, a server being overloaded and therefore delaying working through the move packets that start to pile up. My solution is (in addition of actively ignoring everything that is known to cause more packets than usual) to measure server lag every half second, and only count the clients packets if server lag is small to nonexistant. Depending on how much more packets were counted than expected, a violation level is chosen and consequences (as determined by the admin) are taken.

Airbuild problem: Trusting the players block placing

Just like with Movement, Minecraft does simply believe clients when they claim that a player placed a block at a specific x,y,z location.

Consquence: Placing blocks at invalid locations

The client simply lies (again) and therefore allows a player to place blocks wherever he wants to. This isn't as big a problem now as it was in earlier Minecraft version. Now serverside checks are already in place that prevent players from placing blocks too far away or (in the case of bukkit) at locations that the player couldn't be seeing because they are e.g. behind a wall. But it is still possible (afaik, if you know better and this has been fixed, please tell me!) to place blocks in midair, which isn't possible in an unmodified game.

Solution: Prevent placing blocks in invalid locations

For once a simple solution, just deny placing blocks at locations where the player had nothing to build against. The attempts of doing that are counted per second and, based on the admins settings sorted into different violation levels, can be treated/logged automatically.

Bogusitems problem: Itemstacks with amount smaller or equal to 0 can be used to create infinite legit copies of the item and/or can be used infinitely often

Solution: Delete those itemstacks whenever they are detected or being used.

Alternative/Complementary Plugins:
(I don't take any responsibility if these break your server. I didn't write them, I just find them interesting.)

Problem X-Ray:

FoundDiamonds: Helps you Identify X-Rayers by telling when a player harvests diamonds. Simple, no impact on performance.
AntiXRay: Removes ores from the map and only puts them back in if a player discovers them. Effective, small performance impact.

Didn't find a solution for your problem? Maybe one of these plugins will help you (I'm open for suggestions for this list, as long as they help identify and/or prevent cheating):

Getting the Plugin to work:

1. Download the plugin into your plugins folder. (look further below for download links) The newest version is usually a good choice, but you may have to use an older one if you are using an outdated version of Craftbukkit. Be careful to only have one version of the plugin in that folder at the same time.

2. Load the plugin a first time. Do this by either (re)starting your server or reloading your plugins with the command "reload". This will initialize the plugin, creating a folder "NoCheat" in your "plugins" folder and fill it with two files, a log file and the config file "nocheat.yml". If you delete the config file, a new one will be created when the plugin is (re)loaded the next time.

3. Adjust your config file. It will be always filled with default values, if you didn't specify values yourself.

You can execute the NoCheat.jar directly to get a graphical editor for the config file (windows users can probably just doubleclick it, others will have to do whatever they usually do to execute .jar archives.

You'll also find an always-up-to-date file "descriptions.txt" in your plugins/NoCheat folder specifically for the version you run. Because updating this thread with newest configuration options and the plugin itself is tedious, I just suggest you go and read that "descriptions.txt" file to find out what each option does.

The only thing you won't find information about, is the last option: "customactions:" - it's experimental and won't be there forever or in this form, so don't get to used to it.

"customactions:" (Experimental!) Define your own actions like "cancel" and "log***" here. Don't forget to indent the commands with 4 spaces.
Code:
    nameofaction: command to be executed
for example:
    warnplayer: tell [player] Stop doing that!
You can also change if and when this action should be executed by using the following scheme:
Code:
    nameofaction: [firstexecutedafterXevents,repeat] command to be executed
for example:
    warnplayer: [3,false] tell [player] Stop doing that!
will only be executed after the third event, and only once (within 5 seconds).
4. Adjust permissions: If you don't use a Permissions plugin (you'll get a message when my plugin is loaded telling you that you don't have one) it is quite easy. If you are OP, you won't be checked at all, everybody else will be checked by the "active" checks (see the config section above). If you have a Permissions plugin, you can be a lot more precise (I assume you know how to give permissions to a player, if not, look for instructions on the Permissions plugin authors thread):

Every player with one of these permissions won't be checked by the corresponding check at all.
Code:
nocheat.speedhack
nocheat.moving
nocheat.flying (don't prevent flying within the "moving" check)
nocheat.fakesneak (don't prevent fakesneaking within the "moving" check)
nocheat.fastswim (don't prevent swimming at walking speed within the "moving" check)
nocheat.airbuild
nocheat.bogusitems
nocheat.nuke
Every player with this permission will get log messages in the ingame chat (if you have activated that feature in the config file)
Code:
nocheat.notify
What the log messages mean (open) What the log messages mean (close)
Making sense of log messages:

The moving check does check if a player moved in a way that should've been impossible. It will give you log lines that may look like this:
Code:
03:26:09 [INFO] NC: Moving violation: evenprime from world (-983,3, 63,0, 964,5) to world (-983,0, 63,0, 963,7)
03:26:10 [WARNING] NC: Moving violation: evenprime from world (-966,0, 64,2, 920,3) to world (-965,9, 64,2, 918,3)
03:26:11 [SEVERE] NC: Moving violation: evenprime from world (-960,0, 64,2, 920,3) to world (-977,9, 90,0, 918,3)
Let's break that down. First you'll get a log level in "[ ]" brackets, namely INFO, WARNING and SEVERE. These correspond to the "low", "med", "high" you'll find in the config file and should give a idea about how far off the player movement was compared to the limit set.

INFO: The player went less than 0.5 Blocks too high/far in that move.
WARNING: The player went less than 2.0 Blocks too high/far in that move.
SEVERE: The player went more than 2.0 Blocks too high/far in that move.
(these thresholds will be configurable by you in future versions, such that you can decide how precise the checks are)

Then you get the name of the check ("Moving"), the name of the player "evenprime" and two coordinates "world (x,y,z)". The coordinates allow you to check where this happened and maybe find out what happened. If you believe that it was an error, you should tell me (ideally with screenshots of that place and a description of what the player did) such that I can fix my plugin.

Every 5 seconds you'll also get a line like this:
Code:
03:26:14 [WARNING] NC: Moving summary of last ~5 seconds: evenprime total Violations: (3,5,2)
This just informs you, how many violations happened in, well, the last 5 seconds for that player. The first number is "low" ("INFO"), the second "med" ("WARNING") and the third "high" ("SEVERE"). In the example above I managed to violate the low limits 3 times, medium limits 5 times and the high limits 2 times within 5 seconds.

That's nice, but what does it mean?

There is no easy answer to that. I can give some (real) examples (taken from testing):

A wild mixture of a few low, few med and many high violations usually is the result of a player using noclip (and/or a fly mod in combination). E.g. (3, 7, 25)

Many low violations or many medium violations may be the result of a player running too fast (by increasing the step size, NOT speedhack by changing the system clock) or attempting to fly (if "reset" is active). E.g. (35, 0, 0) or (0, 24, 0)

A (few) high violation(s) with coordinates that are very far apart are likely an attempt to teleport with a clientside hack or a conflict of my plugin with another plugin that tried to do a teleport, but didn't do it right. E.g. (0, 0, 3)

One/A few low/med violations may be either somebody trying to fly and giving up on it immediatly or a bug in my plugin causing false positives, like sometimes when players get knocked back very far in fights. E.g. (2, 0, 0) or (0, 3, 0)

If you only log without cancelling player movement, especially flying people will have a ton more "med" and "high" violations, because every move while they are in midair will be counted as such a violation.
Known problems (open) Known problems (close)

Known Problems:

Players go invisible after being teleported. Seems to still happen occasionally and is not my fault, but rather a bug in Minecraft itself (I believe this is fixed in Minecraft by now)

Players triggering violations when crawling onto ledges. Should almost never happen now and even if, the player will be moved back from the ledge a bit instead of getting stuck.

Some plugins may prevent player teleporting in some situations, which sadly also prevents the teleporting of players back to the ground in case they are flying. I'm working on this.

In some situations the player gets "pushed" somewhere e.g. by explosions, enemies, which is very hard and sometimes impossible to predict by my plugin. In those cases that behaviour may be flagged as cheating, even if it is not. I'm constantly improving on predicting these things, but it is not and will never be perfect.

Features (open) Features (close)

Features:

Prevent flying, running or teleporting by many clientside mods or at least reduce their effectiveness (optional)

Reset players to their last valid location in case of violation (optional)

Detect some speed-hacks that manipulate the system clock (optional)

Log event with timestamp and number of total incidents of that player to console, file, multiplayer chat (configurable)

Prevent placing blocks in midair without another block next to it (optional)

Permissions plugin support (optional)

CraftIRC plugin support (optional)

Donations:

I don't expect any donations, and getting (or not getting) them won't influence the time and effort I put into developing this plugin. I prefer people to help me by answering these questions:

If you use NoCheat, how many players are on your server? What options do you use?

Did you experience a negative performance impact by my plugin? Does it use too much memory or CPU power in your opinion?

Have you found a way to bypass it? Know a client mod that can do so? Where can I find it or can you send it to me?

Know other plugins that do the same as mine or are ideal to use simultaneously (to defeat cheaters/hackers)?

Any other holes in Minecraft that should be stuffed but nobody did so yet?

But if you really like to just say "Thank you", feel free to: (I've fixed the button. Now donations should really work again)

Download Latest Versions:

Download 1: http://dl.dropbox.com/u/18816277/NoCheat.jar v1.08c for RB 953 +
Download 2: http://dl.dropbox.com/u/18816277/NoCheat_1.06b.jar v.1.06b for RB 935
Download 3: http://dl.dropbox.com/u/18816277/NoCheat_1.05c.jar v1.05a for RB 860

Source Code: https://github.com/Evenprime/NoCheat

older Versions (open) older Versions (close)

http://dl.dropbox.com/u/18816277/NoCheat_1.08b.jar RB 953
http://dl.dropbox.com/u/18816277/NoCheat_1.08a.jar RB 953
http://dl.dropbox.com/u/18816277/NoCheat_1.08.jar RB 953
http://dl.dropbox.com/u/18816277/NoCheat_1.07c.jar RB 953
http://dl.dropbox.com/u/18816277/NoCheat_1.07b.jar RB 953
http://dl.dropbox.com/u/18816277/NoCheat_1.07a.jar RB 953
http://dl.dropbox.com/u/18816277/NoCheat_1.07.jar RB 953
http://dl.dropbox.com/u/18816277/NoCheat_1.06a.jar RB 935
http://dl.dropbox.com/u/18816277/NoCheat_1.06.jar RB 935
http://dl.dropbox.com/u/18816277/NoCheat_1.05b.jar RB 860
http://dl.dropbox.com/u/18816277/NoCheat_1.05a.jar RB 860
http://dl.dropbox.com/u/18816277/NoCheat_1.05.jar RB 860
http://dl.dropbox.com/u/18816277/NoCheat_1.04c.jar RB 860
http://dl.dropbox.com/u/18816277/NoCheat_1.04b.jar RB 860
http://dl.dropbox.com/u/18816277/NoCheat_1.04a.jar RB 860
http://dl.dropbox.com/u/18816277/NoCheat_1.03.jar RB 818
http://dl.dropbox.com/u/18816277/NoCheat_1.02.jar RB 818
http://dl.dropbox.com/u/18816277/NoCheat_1.01a.jar RB 803
http://dl.dropbox.com/u/18816277/NoCheat_1.01.jar RB 803

Even older Changelogs and Download links: http://dl.dropbox.com/u/18816277/versionlog.txt

Changelog:

Version 1.08c (for CB 953+)

Rewritten moving check to catch sprinting mods (like Zombe) with speed multipliers set to ~1.2 or more

Version 1.08b (for CB 953)

Added option "nuke.limitreach" to limit the maximum distance of block-breaking to more reasonable value

Fixed boolean options in the config file not getting their correct default values assigned

Version 1.08a (for CB 953+)

Rewritten part of the "nuke" check to make it faster(less multiplications) and more stable (no div/0 errors possible anymore)

Customactions now really should work for commands provided by other plugins

Version 1.08 (for CB 953)

Added experimental check "nuke", which may prevent hack-clients from using that functionality and kicks the player trying to use it. Deactivated by default, because it's experimental and may have unexpected side-effects!

Version 1.07c (for CB 953)

Fixed respawning in case the player's body is still moving while respawning

Version 1.07b (for CB 953)

Fixed rare exception in case of teleports between worlds

Version 1.07a (for CB 953)

Fixed teleporting (this time for real)

Ignore move events of dead players

Version 1.07 (for CB 953)

Fixed teleporting and other stuff that broke with CB 953

Less false positives when jumping/moving around normally

Version 1.06b (for CB 935) + Version 1.05c (for CB 860)

Less false positives when jumping/moving around normally

Version 1.06a (for CB 935) + Version 1.05b (for CB 860)

Potential fix for flying players after respawning

Version 1.06

Adapted moving and speedhack check to RB 928(+) - this means that they won't work with older CB versions!!

Removed bedteleport check

Modified bogusitems check to ignore picking up of items with a stacksize of exactly 0 (to workaround a bug in bukkit)

Version 1.05a

Fixed leaving vehicles (again)

Version 1.05

A little bit better lag-detection and handling in speedhack check

Removed workarounds for respawning and using portals in favour of a simpler solution

New option "checkops" for each check, allowing you to enforce that OPs are also checked

Write nice keywords like [player] into newly generated config files instead of the ugly %1$s stuff

Generate a file "descriptions.txt" with lengthy explainations about every option in the config file on startup

New option "enforceteleport" to override other plugins decisions to cancel NoCheats teleports (ideal for e.g. MobArena)

The GUI config tool will now display the descriptions for each option as a nice message if you click the "?" button

Always rewrite the config file on startup, removing no longer existing options and adding new options with their default values

Minor changes to make the transition to post-CB-888 a bit smoother (hopefully).

Version 1.04c

Potential fix for async tasks not shutting down

new keyword "[distance]" can be used in "moving: logmessage"

Warning about disfunctional Permissions plugin now gets displayed (at most) once every 60 seconds instead of just once per reload (if necessary).

Version 1.04b

Improved handling of plugins that set a players velocity a bit

Potential fix for respawn to custom location bug

Version 1.04a

Fix for vanilla nether portals

Fix for speedhack warning with plugin nether portals

Potential fix for a minecart destruction teleporting a player back to where he came from (needs testing)

Older Changelogs (open) Older Changelogs (close)

Version 1.03

Use soft dependencies to load the Permissions and CraftIRC plugin(s) before the NoCheat plugin (if they are available) to better support Permissions 3.x

Removed "itemdupe" check - no longer needed, because bukkit/minecraft has a fix for that included now

new config option to allow usage of pre-1.6 (water) ladders/elevators without flagging them as cheating

potential fix for exception about an IllegalAccess on startup

Version 1.02

Fixed a bug that could prevent the config file from being read properly

Removed support for water elevators (will be readded as an optional feature later)

Prevent people from hovering above water as if it were solid ground

Prevent "fastswim": people moving through water as fast as they can walk on land (optional).

new permission "nocheat.fastswim" and configuration option "nocheat.allowfastswim" to accompany this feature

Get infos about blocks (liquid? solid? ...) directly from bukkit instead of hardcoding them

Version 1.01a

Don't count placing AIR in the air in airbuild check

Potential fix for the problem(s) with loading the config file

Version 1.01

Fixed bug that could allow flying (to a limited degree) in certain conditions

Try to teleport players closer to the ground, if the original "setback" location is high above ground

Removed some old workarounds for problems that have been fixed by bukkit and/or other plugins

Even older Changelogs and Download links: http://dl.dropbox.com/u/18816277/versionlog.txt
Click to expand...
Thanks for the update and could you add this plugin to a list of your complimentry ?

http://forums.bukkit.org/threads/sec-admin-logores-v0-6-log-ores-to-look-for-cheaters-953.25432/

Its quite lite alternative to anti-xray

Evenprime · May 9, 2016

o0AzzA0o said: ↑

Thanks for the update and could you add this plugin to a list of your complimentry ?

http://forums.bukkit.org/threads/sec-admin-logores-v0-6-log-ores-to-look-for-cheaters-953.25432/

Its quite lite alternative to anti-xray
Click to expand...

Looks nice, added it to the list.

@morizuki :

I just tried it and couldn't reproduce that. Can you send me the config file you use for MobArena and NoCheat? Maybe its some special corner case that's causing this problem. Plus where were the people before teleporting to the arena? Rather close by or far away/in another world?

I used MobArena 0.92.2 and NoCheat 1.08c for testing this.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

morizuki · Jul 10, 2011

ok the people are beside the arena, it's rather close by.. and my mob arena is in another world, so let say.. main world.. going to mob arena world using buttonwarp, after teleporting the mobarena world, /ma join to get to the lobby.. and it will be invisible..

MobArena

Code:

# MobArena Configuration-file
# Please go to https://github.com/garbagemule/MobArena/wiki/Installing-MobArena for more details.
global-settings:
    update-notification: true
    enabled: true
    allowed-commands: /list, /pl
classes:
    Chef:
        items: stone_sword, bread:6, grilled_pork:4, mushroom_soup, cake:3, cookie:12
        armor: 314,315,316,317
    Oddjob:
        items: stone_sword, wood_pickaxe, tnt:4, lever:4, fishing_rod, apple, grilled_pork:3
        armor: 298,299,300,301
    Tank:
        items: iron_sword, grilled_pork:3, apple
        armor: 310,311,312,313
    Knight:
        items: diamond_sword, grilled_pork:2
        armor: 306,307,308,309
    Archer:
        items: wood_sword, bow, arrow:128, grilled_pork
        armor: 298,299,300,301
    Tamer:
        items: iron_sword, grilled_pork:1, bone:2
        armor: 298,299,300,301
arenas:
    default:
        settings:
            world: Arena_Grass
            enabled: true
            protect: true
            clear-wave-before-next: false
            detonate-creepers: false
            detonate-damage: false
            lightning: true
            auto-equip-armor: true
            force-restore: false
            soft-restore: false
            soft-restore-drops: false
            require-empty-inv-join: true
            require-empty-inv-spec: true
            hellhounds: true
            pvp-enabled: false
            monster-infight: false
            allow-teleporting: false
            player-limit: 5
            repair-delay: 5
            first-wave-delay: 5
            wave-interval: 20
            special-modulo: 4
            max-idle-time: 0
        waves:
            default:
                spiders: 10
                creepers: 10
                skeletons: 10
                wolves: 10
                zombies: 10
            special:
                ghasts: 5
                zombie-pigmen: 10
                slimes: 10
                powered-creepers: 10
                giants: 0
                humans: 10
                angry-wolves: 10
        rewards:
            waves:
                after:
                    '7': minecart, storage_minecart, powered_minecart
                    '16': diamond_sword
                    '13': iron_sword, iron_pickaxe, iron_spade
                every:
                    '3': feather, bone, stick
                    '10': iron_ingot:10, gold_ingot:8
                    '5': dirt:4, gravel:4, stone:4
        coords:
            lobby: 4,75,24,0.0,0.0
            spectator: 0,81,-26,0.0,0.0
            arena: 0,73,0,0.0,0.0
            spawnpoints:
                s1: 0,73,-8,1.9485779,23.099932
                s2: -8,73,0,272.39813,13.799981
                s3: 0,73,7,182.54868,24.450024
                s4: 7,73,0,94.94864,21.149986
            p1: -16,66,-28,179.25159,0.7500043
            p2: 15,87,27,0.30090332,15.15001

NoCheat

Code:

logging:
    filename: "plugins/NoCheat/nocheat.log"
    logtofile: "low"
    logtoconsole: "high"
    logtochat: "med"
    logtoirc: "med"
    logtoirctag: "nocheat"
active:
    speedhack: "true"
    moving: "true"
    airbuild: "false"
    bogusitems: "false"
    nuke: "true"
speedhack:
    logmessage: "[player] sent [events] move events, but only [limit] were allowed. Speedhack?"
    checkops: "false"
    limits:
        low: "22"
        med: "33"
        high: "44"
    action:
        low: "loglow cancel"
        med: "logmed cancel"
        high: "loghigh cancel"
moving:
    logmessage: "Moving violation: [player] from [world] [from] to [to] distance [distance]"
    summarymessage: "Moving summary of last ~[timeframe] seconds: [player] total Violations: [violations]"
    allowflying: "false"
    allowfakesneak: "true"
    allowfastswim: "false"
    waterelevators: "false"
    checkops: "false"
    enforceteleport: "false"
    action:
        low: "loglow cancel"
        med: "logmed cancel"
        high: "loghigh cancel"
airbuild:
    checkops: "false"
    limits:
        low: "1"
        med: "3"
        high: "10"
    action:
        low: "loglow cancel"
        med: "logmed cancel"
        high: "loghigh cancel"
bogusitems:
    checkops: "false"
nuke:
    checkops: "false"
    logmessage: "Nuke: [player] tried to nuke the world"
    kickmessage: "No nuking allowed"
    limitreach: "true"
customactions:

Evenprime · Jul 10, 2011

morizuki said: ↑

ok the people are beside the arena, it's rather close by.. and my mob arena is in another world, so let say.. main world.. going to mob arena world using buttonwarp, after teleporting the mobarena world, /ma join to get to the lobby.. and it will be invisible..
Click to expand...

Hm, still nothing. But with those setting you should at least get a message from NoCheat in your logfile "/plugins/NoCheat/nocheat.log" in the case that NoCheat did or tried to do something. Can you check if there are any messages for that specific time when players join the arena?

Is somebody else using NoCheat and MobArena together or knows of a server that uses that combination? How does it work out for you/that server? I know there are a lot with that combination (by googling nocheat + mobarena), so please step forward and speak up.

morizuki · Jul 10, 2011

Evenprime said: ↑

Hm, still nothing. But with those setting you should at least get a message from NoCheat in your logfile "/plugins/NoCheat/nocheat.log" in the case that NoCheat did or tried to do something. Can you check if there are any messages for that specific time when players join the arena?

Is somebody else using NoCheat and MobArena together or knows of a server that uses that combination? How does it work out for you/that server? I know there are a lot with that combination (by googling nocheat + mobarena), so please step forward and speak up.
Click to expand...

oh it worked after I've changed the Teleport to true in config.yml of NoCheat.. but when using /tp it make them invisible..

and also can you add a changeable in Speedhacking like the Zombe Mod fly mod the one with a speed of 1.2 i want to change it to 1.6 if it's possible..

Evenprime · Jul 10, 2011

morizuki said: ↑

and also can you add a changeable in Speedhacking like the Zombe Mod fly mod the one with a speed of 1.2 i want to change it to 1.6 if it's possible..
Click to expand...

Yes, I'll add a option for that in the next version.

Lykkepillen · Jul 10, 2011

Do you think this is an issue with NoCheat or me not having updated Permissions for a while?

Code:

2011-07-10 19:41:32 [SEVERE] NC: Asking Permissions-Plugin if rezin123 has permission nocheat.moving caused an Exception null. Please review your permissions config file. This message is displayed at most once every 60 seconds.
2011-07-10 19:41:33 [SEVERE] java.lang.NullPointerException
2011-07-10 19:41:33 [SEVERE]    at com.nijiko.permissions.Control.getGroup(Control.java:535)
2011-07-10 19:41:33 [SEVERE]    at com.nijiko.permissions.Control.permission(Control.java:308)
2011-07-10 19:41:33 [SEVERE]    at com.sk89q.bukkit.migration.NijiPermissionsResolver.hasPermission(NijiPermissionsResolver.java:61)
2011-07-10 19:41:33 [SEVERE]    at com.sk89q.bukkit.migration.PermissionsResolverManager.hasPermission(PermissionsResolverManager.java:102)
2011-07-10 19:41:33 [SEVERE]    at com.sk89q.worldguard.bukkit.WorldGuardPlugin.hasPermission(WorldGuardPlugin.java:322)
2011-07-10 19:41:33 [SEVERE]    at com.sk89q.worldguard.protection.GlobalRegionManager.hasBypass(GlobalRegionManager.java:232)
2011-07-10 19:41:33 [SEVERE]    at com.sk89q.worldguard.bukkit.WorldGuardPlayerListener.onPlayerMove(WorldGuardPlayerListener.java:286)
2011-07-10 19:41:33 [SEVERE]    at org.bukkit.plugin.java.JavaPluginLoader$7.execute(JavaPluginLoader.java:286)
2011-07-10 19:41:33 [SEVERE]    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:58)
2011-07-10 19:41:33 [SEVERE]    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:321)
2011-07-10 19:41:33 [SEVERE]    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:163)
2011-07-10 19:41:33 [SEVERE]    at net.minecraft.server.Packet10Flying.a(SourceFile:126)
2011-07-10 19:41:33 [SEVERE]    at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
2011-07-10 19:41:33 [SEVERE]    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:84)
2011-07-10 19:41:33 [SEVERE]    at net.minecraft.server.NetworkListenThread.a(SourceFile:105)
2011-07-10 19:41:33 [SEVERE]    at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:451)
2011-07-10 19:41:33 [SEVERE]    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361)
2011-07-10 19:41:33 [SEVERE]    at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)

fysics · Jul 10, 2011

Hey, I've noticed that i get significant cpu usage (at or around 100%, when normal cpu usage is in the 20% to 30% range) when people fly, even when they have permission to fly. I don't know how exactly you're doing it now, but an easy fix would be to check if someone has permission to fly, and if they do, skip the fly check altogether instead of doing the permission check after the fly check. (Maybe you're already doing it this way.)

Evenprime · May 9, 2016

fysics said: ↑

Hey, I've noticed that i get significant cpu usage (at or around 100%, when normal cpu usage is in the 20% to 30% range) when people fly, even when they have permission to fly. I don't know how exactly you're doing it now, but an easy fix would be to check if someone has permission to fly, and if they do, skip the fly check altogether instead of doing the permission check after the fly check. (Maybe you're already doing it this way.)
Click to expand...

Yeah, I'm doing it already that way around. But anyway the plugin shouldn't cause an increase in CPU usage depending on players flying or not - the flying check is just a few additional additions and multiplications. Do you get any output on the console when people are flying, e.g. some error messages? That would better explain that increased usage. Or are you also using the Anti-Hack plugin? That one does get much more CPU intensive when players fly, and does the permissions check only afterwards.

Lykkepillen said: ↑

Do you think this is an issue with NoCheat or me not having updated Permissions for a while?
Click to expand...

You probably don't have to update Permissions. Just go through your permissions files, especially for user "rezin123" and check if the group he belongs to is spelled correctly/exists/... It is definitely an error in the permissions configuration file somewhere that prevented the Permissions-plugin from finding out which group "rezin123" belongs to.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

fysics · Jul 10, 2011

Evenprime said: ↑

Yeah, I'm doing it already that way around. But anyway the plugin shouldn't cause an increase in CPU usage depending on players flying or not - the flying check is just a few additional additions and multiplications. Do you get any output on the console when people are flying, e.g. some error messages? That would better explain that increased usage. Or are you also using the Anti-Hack plugin? That one does get much more CPU intensive when players fly, and does the permissions check only afterwards.
Click to expand...

Hmmm... I'll look into it.

chaseoes · Jul 11, 2011

Evenprime said: ↑

Hm, still nothing. But with those setting you should at least get a message from NoCheat in your logfile "/plugins/NoCheat/nocheat.log" in the case that NoCheat did or tried to do something. Can you check if there are any messages for that specific time when players join the arena?

Is somebody else using NoCheat and MobArena together or knows of a server that uses that combination? How does it work out for you/that server? I know there are a lot with that combination (by googling nocheat + mobarena), so please step forward and speak up.

Click to expand...

I'm using MobArena and NoCheat together (have been for a while) and have never had issues with invisibility.. or any issues at all.

morizuki · Jul 11, 2011

ok something problem.. my player just register using xAuth and it suddenly give a warning

Code:

11.07.11 02:31:01 [INFO] NC: Moving violation: xxxxx from world (-8.2, 65.2, -991.9) to (-8.3, 65.8, -992.3) distance (0.0, 0.6, 0.5)
11.07.11 02:31:06 [INFO] NC: Moving summary of last ~5 seconds: xxxxx total Violations: (5,0,0)
11.07.11 02:31:06 [WARNING] NC: Moving violation: xxxxx from world (-8.4, 64.0, -990.9) to (-8.3, 64.0, -990.4) distance (0.1, 0.0, 0.5)
11.07.11 02:31:11 [WARNING] NC: Moving summary of last ~5 seconds: xxxxx total Violations: (0,6,0)
11.07.11 02:31:13 [WARNING] NC: Moving violation: xxxxx from world (-8.2, 64.0, -991.8) to (-8.2, 64.0, -992.0) distance (0.0, 0.0, 0.2)
11.07.11 02:31:18 [WARNING] NC: Moving summary of last ~5 seconds: xxxxx total Violations: (0,4,0)

Paah · Jul 11, 2011

NoCheat doesn't like players dropping from Skylands back to normal world.
http://forums.bukkit.org/threads/mi...nds-are-in-your-dreams-permissions-953.24188/

Evenprime · May 9, 2016

@morizuki :
@Paah :

After testing a bit I believe those two problems may be related. I'll see what I can do about it.

@morizuki : Your problem may be fixed with this newer version of NoCheat. I couldn't get xAuth to freak out like that, so I can't say if it really was the same problem or not...

@Paah : Your problem should be fixed now, at least I couldn't reproduce it after the changes I made anymore.

Version 1.09 (for CB 953+)

Replaced flying check with a newer version that is especially strong at catching hovering players, in addition to the usual stuff

Fixed some other teleporting issues, where other plugins do the teleporting in a not so obvious way or strange situations (like if the player drops out of the bottom of a map)
Those two things belong together. The new flying check is also something I've been working on for NC 2.0, and works similar to the running check. Plus it will be pretty tough on people trying to hover over gaps or in midair, no more walking around in the air after falling a few dozen blocks.

Fixed descriptions.txt to be written/updated correctly again when loading the plugin
It contains instructions on the settings of the config file. Go read it, people!

Fixed log summary message sometimes getting filed under a too high severity level
Something small, but whatever. I always wanted that the 5-second summaries have a severity level that matches the values in the summary. Now this really works.

This was a bit of a bigger modification and may break other stuff related to movement (although I hope not and don't think so).

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

embty · May 9, 2016

Evenprime said: ↑

Hm, still nothing. But with those setting you should at least get a message from NoCheat in your logfile "/plugins/NoCheat/nocheat.log" in the case that NoCheat did or tried to do something. Can you check if there are any messages for that specific time when players join the arena?

Is somebody else using NoCheat and MobArena together or knows of a server that uses that combination? How does it work out for you/that server? I know there are a lot with that combination (by googling nocheat + mobarena), so please step forward and speak up.

Click to expand...

The problem is that mobarena prevents any kind of teleportation inside of its area. so when you fly and nocheat tries to teleport u back to ur position, mobarena prevents mobarena from doing that.

Is it possible to have an option to kick/ban players when they have a certain amount of violations? And possibly get a msg "hacking is not allowed" ?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

Evenprime · Jul 11, 2011

embty said: ↑

The problem is that mobarena prevents any kind of teleportation inside of its area. so when you fly and nocheat tries to teleport u back to ur position, mobarena prevents mobarena from doing that.
Click to expand...

You can go into NoCheats config file and set "enforceteleport=true". Then NoCheat will teleport players who are inside mobarena despite mobarena trying to prevent it. It's just not activated by default because it may cause problems with other plugins.

embty said: ↑

Is it possible to have an option to kick/ban players when they have a certain amount of violations?
Click to expand...

Only for a certain amount of violations within 5 seconds (I currently don't store them longer than that - this will change however at some point). Just add e.g.
Code:
customactions:
    kickme: "[10,false] kick [player] Goodbye Sir!"
at the end of the config file and "kickme" in addition or replacement to the existing "logxxx cancel" settings wherever you want it. Like this:
Code:
moving:
    actions:
        low: "loglow cancel"

        med: "logmed cancel"

        high: "loghigh cancel kickme"
That will execute the servers kick command on the player after 10 heavy violations within 5 seconds (the "false" just says that this action will be only executed once per 5 seconds).

embty · Jul 11, 2011

Evenprime said: ↑
You can go into NoCheats config file and set "enforceteleport=true". Then NoCheat will teleport players who are inside mobarena despite mobarena trying to prevent it. It's just not activated by default because it may cause problems with other plugins.

Only for a certain amount of violations within 5 seconds (I currently don't store them longer than that - this will change however at some point). Just add e.g.
Code:
customactions:
    kickme: "[10,false] kick [player] Goodbye Sir!"
at the end of the config file and "kickme" in addition or replacement to the existing "logxxx cancel" settings wherever you want it. Like this:
Code:
moving:
    actions:
        low: "loglow cancel"

        med: "logmed cancel"

        high: "loghigh cancel kickme"
That will execute the servers kick command on the player after 10 heavy violations within 5 seconds (the "false" just says that this action will be only executed once per 5 seconds).
Click to expand...
Can it be for 3 violations instead of 10 ?

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