SELinux in action

by FelixBauer 2 years ago

GNU/Linux ◆ xterm-256color ◆ zsh 776 views

On centos 8

First I create a new daemon that provices a bindshell and install it to the system. It runs unconfined and everything works. Later I create a policy so it starts but gets killed once I connect to it and execute a command.

Much based on this guide:

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/using_selinux/writing-a-custom-selinux-policy_using-selinux

With code heavily based on deadbits github repository:

https://github.com/deadbits/shells

More by FelixBauer

Detect Reconnaissance with Auditd 00:45

by FelixBauer 2 months ago

Routing Basics (inside LXD) 08:22

by FelixBauer 6 years ago

Docker Vars in ENV of unprivileged user 01:36

by FelixBauer 6 years ago

Check app security with mitmproxy --mode wireguard 00:39

by FelixBauer 1 year ago

See all

You can download this recording in asciicast v2 format, as a .cast file.

Download

Replay in terminal

You can replay the downloaded recording in your terminal using the asciinema play command:

asciinema play 487811.cast

If you don't have asciinema CLI installed then see installation instructions.

Use with stand-alone player on your website

Download asciinema player from the releases page (you only need .js and .css file), then use it like this:

<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" type="text/css" href="asciinema-player.css" />
</head>
<body>
  <div id="player"></div>
  <script src="asciinema-player.min.js"></script>
  <script>
    AsciinemaPlayer.create(
      '/assets/487811.cast',
      document.getElementById('player'),
      { cols: 160, rows: 32 }
    );
  </script>
</body>
</html>

See asciinema player quick-start guide for full usage instructions.

While this site doesn't provide GIF conversion at the moment, you can still do it yourself with the help of asciinema GIF generator utility - agg.

Once you have it installed, generate a GIF with the following command:

agg https://asciinema.org/a/487811 demo.gif

Or, if you already downloaded the recording file:

agg demo.cast demo.gif

Check agg --help for all available options. You can change font family and size, select color theme, adjust speed and more.

See agg manual for full usage instructions.