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Plus d'nformations sur l'association.
Rejoignez-nous chaque mardi au weekly meeting, ouvert à tous.
Voir photos

More information about our association.
Join us every tuesday at our weekly meeting (en), open to everyone.
See photos


Coronavirus (CoViD-19)


Pour des raisons de protection sanitaire liées au Covid-19, et suite à la décision du conseil fédéral d’interdire les événements public et privé, ainsi que la fermeture de tous les lieux de divertissement et commerce non alimentaire, le comité de Post Tenebras Lab à pris la décision de fermer et d’annuler toutes les activités liées de l’association jusqu'à ce que la situation s'améliore.

2020/03/30 11:18 · micmac2 · 0 Pas de commentaires

Assemblée Générale Ordinaire 2020

Vous êtes cordialement invité(e) à notre Assemblée Générale ordinaire qui aura lieu le vendredi 7 février 2020 à 19h30 précise dans nos locaux à Avenue de la Praille, 36 - Carouge.

Tous les membres sont priés d'y participer, de se faire excuser ou donner une procuration à un autre membre en utilisant le Formulaire procuration .

Veuillez consulter l'ordre du jour et inscrivez vous pour le repas.

2020/01/22 01:17 · micmac2 · 0 Pas de commentaires

Calibrate the colors of your laptop screen on Linux

Some days ago I found this little puppy on ricardo.ch:

it's an X-Rite i1 Pro display calibration colorimeter.

It just arrived at my door and I tested it on my tiny and old, little Linux laptop and … it worked!

For any other member willing to calibrate his monitor, I will leave it on my not-locked-locker, in a little dark bag, feel free to use it (please, don't take it away from the PTL).

If you are on Linux you can follow the instructions here.

I used this really professional open source calibration software: https://displaycal.net/.

The result is noticeable: the images seem more naturals.

More important the colors are, if not exactly, way closer to what the author meant and calibration is even more crucial if the author is you.


Turn your Raspberry Pi into a Spotify remote device in three steps

If you happen to have a Spotify Premium account, a Raspberry lying on your lan and some speakers, you could easily stream your Spotify playlist from your phone to the raspberry.

Shrunken installation steps look like these:

  $ wget https://github.com/Spotifyd/spotifyd/releases/download/0.2.11/spotifyd-2019-06-19-armv6.zip
  $ unzip ./spotifyd-2019-06-19-armv6.zip
  $ ./spotifyd

Check this extended cookbook note for further details: Turn your Raspberry Pi into a Spotify remote device

2019/06/23 17:03 · pliski

Launch an hidden service with Tor

Some of us followed this conference of Axel Beckert at Cosin 2019.

Go and watch the slides to learn some neat tricks on ssh. Anyway, in this page we will talk about a past workshop I found in the same author's site call Gate as a public, free VPN to reach your own server at home behind NAT.

So I'll show in few steps how I've managed to pull up an hidden web service via the Tor onion network.

Prepare to launch

All you need for your tor service.

Hello world

I've put together a simple hello world web service just for the purpose of showing something. Clone the expresshello repo from github or with:

  git clone https://github.com/pliski/expresshello.git

(For the records and for the curious it's done with Nodejs/Express/Typescript)


We will use docker to build up our service, because its simple, easy shareable, does not pollute your environment, etc etc.

So make sure you have Docker and docker-compose installed.

Tor Browser

To access the service you can get a tor browser here .

On Ubuntu I followed these steps in order to install it.


3,2,1 ... Tor

You should follow along the slides of the workshop if you want to have a better understanding of the process. Anyway here we will take a shortcut and use a docker-compose file, like one of those found in this useful repo, that I've adapted to launch our expresshello service.

So, go into the expresshello directory that you have already installed and type:

  docker-compose -f docker-compose.tor.yml up

And that's all. Compose will download the goldy/tor-hidden-service and expresshello docker images and run them; at the end, if all went well, you should see the Done message and the Express console waiting for some connection.

Retrieve the address

The goldy/tor-hidden-service docker image come with a nice utility to retrieve the address of your service. Type:

  docker exec -ti expresshello_tor_1 onions

Then copy the address (something like vegm3d7q64gutl75.onion:80) and paste it in the tor browser.

If you are still skeptic try the same thing from another machine/address.

Reach the stars

Now what?

Some practical(?) use cases/ideas.

Call Ground Control

Install docker in a Raspberry PI at your home and launch your remote home automation service. Or don't use docker and follow the slides.


You can try other images from docker hub or build your own. So why not an image of an SSH server that you could reach with something like:

  ssh -o 'ProxyCommand = nc -X 5 -x localhost: 9050% h% p' pi@kumd43gasfh6ywxt.onion

See this slide .


This was a very quick jump, I encourage you to follow the slides of the talk if you want to dig deeper (or fly higher!).

If you have other use cases or ideas of hidden services feel free to share them in the comments.

start.txt · Dernière modification: 2016/03/29 17:21 par t42