https://github.com/aphyr/tund

SSH reverse tunnel daemon
https://github.com/aphyr/tund

Last synced: 17 days ago
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SSH reverse tunnel daemon

• Host: GitHub
• URL: https://github.com/aphyr/tund
• Owner: aphyr
• License: mit
• Created: 2010-12-24T21:32:09.000Z (almost 14 years ago)
• Default Branch: master
• Last Pushed: 2020-02-07T23:14:15.000Z (almost 5 years ago)
• Last Synced: 2024-11-17T06:08:29.967Z (25 days ago)
• Language: Ruby
• Homepage:
• Size: 13.7 KB
• Stars: 419
• Watchers: 17
• Forks: 27
• Open Issues: 1
• Metadata Files:
  • Readme: README
  • License: LICENSE

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README

        
Tund (tunneling daemon) establishes a reverse SSH tunnel from some publically

accessible computer to your own. In the event of theft or loss, you can log in

to your machine as soon as it connects to the internet.

It's also useful for machines behind a NAT you'd like to have a tunnel to.

You need two computers: the local host (say, your laptop), and the remote host,

which is on the internet. Tund will use SSH forwarding to connect a port on the

remote host to a port on the local host. You can then ssh -p 

remote.com to access your local host.

First, edit the options in bin/tund.

Install tund and generate a passwordless SSH keypair. I've included an upstart

setup script for you, which should work on Ubuntu.

  local$ sudo bin/setup

Create a user on the remote host

  remote# adduser --disabled-password --shell /bin/false tunnel

  remote# cd ~tunnel

  remote# rm .bash* .profile

On the tunneling host, create .ssh/authorized_keys

  remote# mkdir .ssh

  remote# $VISUAL .ssh/authorized_keys

and paste the public key into that file.

Lock down the user's homedir

  remote# chown -R tunnel:tunnel ~tunnel

  remote# chmod 400 .ssh/authorized_keys

  remote# chmod 500 . .ssh

Confirm that you can establish a tunnel:

  local$ ssh -vgN -i etc/tund/key -R 2222:localhost:22 [email protected]

You can re-run bin/setup any time to make changes.

I suggest leaving a honeypot account available on your local machine. It will

encourage laptop thiefs to use the machine as-is. When they connect it to the

network, you'll be able to recover it. Conversely, any user capable of running

a privilege escalation attack has already won, when physical access is

available.