Tarbit - A async ruby tcp tarpit

Introduction

Tarbit is a tcp tarpit written in ruby. It can slow down automated ssh/http/tcp "attacks" or bot connections. It is designed to consume a very little amount of cpu and memory. Tarbit can also generate statistic images.

"Red Wood Cutting", Vladimir Kush

Tarbit is heaviliy inspired by endlessh, the python version, feel free to take a look: https://nullprogram.com/blog/2019/03/22/

Installation

gem install tarbit

You can now run tarbit manually (you can also omit the default params):

The interval option marks the seconds until the statistics are written to disk.

tarbit serve --port 22 --interval 1800

Advanced

Create a systemd service

Verify your tarbit executable: (change the path bin to wrapper within the systemd ExecStart )

which tarbit

[Unit]
Description=Tarbit - ruby ssh tarpit

[Service]
Type=simple
ExecStart=/usr/local/rvm/gems/ruby-2.6.5/wrappers/tarbit serve
AmbientCapabilities=CAP_NET_BIND_SERVICE

[Install]
WantedBy=multi-user.target

Create a cron job for making statistic snapshots:

Again make sure the path has changed bin with wrapper

* */2 * * * /usr/local/rvm/gems/ruby-2.6.5/wrappers/tarbit snapshot

It is recommended to cleanup the statistics folder. You can use a cron job too. (It will remove all statistics every 12 hours)

* */12 * * * rm /etc/tarbit/statistics/*.json

Enjoy statistics like these:

Troubleshooting

Native extensions: Imagemagick can not find MagickWand.h

On Ubuntu, you can run:

sudo apt-get install libmagickwand-dev

On Centos, you can run:

sudo yum install gcc ImageMagick-devel make which

On Macos, you can run:

brew install imagemagick@6
brew link --force imagemagick@6

On Windoes, you can install Linux instead.