BPF-based dns_events table in osquery with uprobes

by alessandrogario 4 years ago

GNU/Linux ◆ xterm-256color ◆ zsh 83 views

The dns_events table is able to capture getaddrinfo invocations system wide making use of BPF and Uprobes. Does not require kernel headers or external libraries.

In this demo, we are capturing the “node” and “service” parameters from the getaddrinfo function inside the libc library.

Implemented using the ebpfpub library (https://github.com/trailofbits/ebpfpub).

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

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asciinema play 301515.cast

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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/301515.cast',
      document.getElementById('player'),
      { cols: 120, rows: 39 }
    );
  </script>
</body>
</html>

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Once you have it installed run the following command to create GIF file:

agg https://asciinema.org/a/301515 301515.gif

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agg 301515.cast 301515.gif

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