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This year, many Hackeriet members attended the 39th Chaos Communication Congress. It was a blast! As part of our efforts to improve how we organize these trips, we held a lessons-learned meetup afterward. Around 15 people joined the meeting, and there was good engagement and a strong willingness to contribute.

There was broad agreement that this year’s congress worked well. Notes were prepared in advance and added during the meeting; these are available at https://pad.hackeriet.no/40C3. The…

Securing systems exposed to the internet is a moving target, especially when dealing with brute-force attacks on authentication services. I run a Zimbra mail server on an Ubuntu 18.04 server (yes, I know it’s time to upgrade), and I decided to tackle these never-ending login attempts. Along the way, I integrated AbuseIPDB for IP reporting, configured the recidive jail for persistent offenders, and encountered a few interesting bugs and quirks worth sharing.

Fail2Ban is an open-source intrusion…

Hackeriet at one point aquired a few Fun Generation LED pots, and one of the strong selling arguments for us was the knowledge that they supported DMX.

“DMX (Digital Multiplex) is a protocol used to control devices such as lights or fog machines. The signal is unidirectional, meaning it only travels in one direction; from the controller or first light, all the way to the last. In its most basic form, DMX is just a protocol for lights, like how MIDI is for keyboards or DAW controllers.” 1

This…