Coding – Tog Hackerspace

26/06/202126/06/2021

Hack Challenge Redo (part3)

We had a small break with our hacking challenges Redo. The format of the Meetup required a change, to accommodate for less experienced visitors. And as much as I love the SANS Institute Challenges, they tend to be quite a puzzle, especially later one. So for now, we are going to focus on couple other Hacking Challenges that are available online. And hopefully in December, when new 2022 SANS Hack Challenge starts, we will have a group ready to battle it together 🙂

Let’s start from Over the Wire. There are plenty games there, we will start with the Bandit, as most suitable to get used to the platform. Bandit offers 33 levels to play, it teaches Linux commands and tools. In each level your goal is identical, find a password to the next level, but let’s start from the beginning.

To play Bandit you will need to establish SSH connection to the Over the Wire lab server, all details of connection are given in Level 0.

So, what is SSH?

Secure Shell, sometimes referred to as Secure Socket Shell, is a protocol which allows you to connect securely to a remote computer or a server by using a text-based interface. When a secure SSH connection is established, a shell session will be started, and you will be able to manipulate the server by typing commands within the client on your local computer. System and network administrators use this protocol the most, as well as anyone who needs to manage a computer remotely in a highly secure manner.

How to use SSH on Windows?

Most common ways of using SSH on Windows is by using one of the clients. Most popular clients are: PuTTY, BitwiseSSH and OpenSSH. Windows 10 users have now the option to use build-in OpenSSH client. Just follow the installation details of your choose client.

How to use SSH on Mac?

Mac’s have build-in Terminal feature, that provides SSH client.

How do we do it on Linux?

That shouldn’t be a problem for any regular Linux users, but in case you are just starting with Linux. Go to your terminal and type:

ssh

This should list all ssh details and commands. If that’s not the case, just use the following command to install OpenSSH:

sudo apt-get install openssh-client

Full list of common SSH flags can be found here.

This should get everyone started and ready for this week challenge 🙂

One more thing, you may need to use Vim and couple Linux commands.

See you @ 5-7pm today @ our dedicated Discord channel.

15/04/202115/04/2021

Project: Fun with Smart Plugs and Tasmota

This project is by our member Jeffrey Roe and is about saying goodbye to the default firmware on this smart plug.

The project started with a request from an artist for a device to turn on/off up to eight devices that are mains powered with a custom timing sequence. I decided to try out smart plugs as they have come down in price. It would also save building a circuit of relays as I have done in the past. Most smart plugs come with a firmware that connects the device to a private server and requires the internet to control it. The use case called for this unit to be used without the internet.

After doing a bit of research, the open firmware Tasmota seemed to have all the features the project needed and would cut down on the need to code up something totally from scratch. To flash the new firmware, some devices allow this to be done wireless but most require soldering wires to the microcontroller. The ease of soldering the wires varies from device to device due to the placement of the chip. The soldering job can be much harder on some devices.

Wireless flashing seemed the easy way to go as it required no soldering, so I purchased two plugs that the internet said worked with the TUYA-CONVERT. I went for two AOFO 4AC + 4USB Power Strip plugs ( Model C379 ).

This is when the problems started. After hours of work, getting PI ready, installing the flashing tool and nothing happens. It turns out the blog post that recommended this plug combination with using the flashing tool had a comment at the end of the post (Which I did not read before starting out). It warned people that a recent update by the manufacturer fixed the hole that allowed users to flash a new firmware over the air.

Plan B was now in operation and I knew a soldering iron would be involved. https://templates.blakadder.com/index.html is a great website with a list of devices that can be used with Tasmota, which pins to connect to, how to get access to the pins and the template to control all the features Unfortunately the two plugs I now had awkwardly required the chip to be completely removed in order to flash them.

Due to lockdown, all I had at home was a soldering iron, solder and solder braid. No desoldering tools. After some effort, I managed to desolder the chip and connect the five wires required to flash the chip. Using the great tool Tasmotizer, it is straightforward to flash the chip with the wires in place. You can even give the WiFi details and config template.

Then started the job of putting the chip back in the board, soldering it again and putting all the parts back together. With a quick test, all was back working but another plug was still left one to do. In the previous photo above, you might have noticed a black plastic cover on the board that covers each plug. That cover blocks access to a pin required to put the chip into flashing mode and hence the need for all this desoldering. The second time around I checked if I could remove this cover and to my surprise, it came off.

\o/. With the cover off I could just solder wires to all the pins and not remove the chip from the board. This speeded up the whole process and made flashing the chip much much easier. A few crocodile clips, an FTDI programmer and we were in business. Both plugs are now ready to be controlled via WiFi API call.

I have updated the page on https://templates.blakadder.com/aofo_C379.html so anyone else flashing these plugs can know about this shortcut.

The rest of the project involved adventures in writing code for esp32 & esp8266 and problems with WiFi but that is for another time.

If you would like to see more photos from the project check out our gallery.

14/01/202122/01/2021

12 years of TOG – a perfect time to do some hacking :-)

For the last five years I was getting more and more anxious the closer it was till the end of the year. Why so? The answer is very simple – the SANS Hack Challenge (https://holidayhackchallenge.com/2020/index.html) run online by Counter Hack Team (https://www.counterhack.com/expert-pen-testers). I have learnt plenty and had an immeasurable amount of fun while solving hacking challenges. This winter I found myself helping others with their tasks by giving hints and I discovered that I have learnt even more. The best part was seeing others to grow and to learn how to beat the tasks.

Unfortunately, SANS hack challenge is only once a year and I didn’t always managed to find enough spare time to solve all the puzzles. Luckily, there is a way to fix that.

So, this year to celebrate 12th birthday of Tog, there will be a pleasant surprise. A walk through a past SANS Holiday Challenges. We will start on the 23rd of January, all info will be posted online. So, keep an eye on our website and reserve time between 5 pm and 7 pm on the day to join the discussion on a dedicated Discord channel https://discord.gg/322Kw4bkQK.

16/01/202016/01/2020

TOG to host Free Software Foundation Europe meetup, Monday 20th January 7pm

At the Chaos Communications Congrass a few years ago I met with the Free Software Foundation Europe (fsfe.org) and was impressed with their work. They advocate for free software and are working on a campaign called Public Money Public Code (publiccode.eu).

TOG will be hosting a meetup for members of FSFE and anyone interested in free software on Monday, 20^th January at 7pm. Everyone is welcome, details about the venue on www.tog.ie.

06/05/201902/01/2020

What’s happening in Tog in May

Wave Hackers experimental music group.
Seb’s amazing experimental audio research and performance group, a place for artists, dreamers, geeks, hackers, nerds, outcasts, weirdos, rebels and scientists to experiment and create. Circuit bending, instrument design and creation. Everyone welcome, no experience necessary – learn and share but most importantly enjoy yourself. Hosted by Seb every first and third Friday of the month, 3rd and 17th May, from 7 to 10 pm. Let us know you’re coming on meetup.

Electronics and Micro Controller Night: If you hanker to harness the awesome power of electricity and light up a few LEDs or crank a dynamo, Electronics and Micro Controller night is for you. Every second Monday, Gary will guide you into the electronics room where there is a dizzying variety of electronic components to help out beginners and the more experienced alike. You can buy basic kits and we’ll show you what to do with them. Runs Monday 6th and 20th May, starting at 7 pm and finishing at 9 pm. Vital that you bring your own laptop, we don’t have a supply.

CAD Night: Krzysztof and Louise are your guides for 3D printing and laser cutting night, every second Wednesday, in May the 1st, 15th and 29th, from 7 pm to 9 pm. We have a working Prusa Mk 3 3D printer, and a Lasersaur for laser cutting. Please bring your own laptop.

Ray got a little carried away last Open Social night…

Open Social: If you want to see where all these mind-bogglingly fascinating projects take place, come along to our Open Social night on Saturday 18th May from 7 pm until late or later. No need to be a member, just turn up. Food and drink contributions welcome. We will probably roll out the near-legendary pizza oven, weather permitting.

Craft Night: Lots of tools and materials here for dedicated and beginner crafters: this includes, but is not limited to, embroidery, sewing, knitting, screen printing, crochet, drawing, painting, woodwork. Bring your own project along or start one from scratch, there is a wealth of talent and experience on hand to help you get started or navigate the tricky bits. Every other Wednesday, the 1st, 15th and 29th May, starting at 7 pm.

Lock Picking: Ever-popular lock-picking night happens on Mondays, in May on the 13th and 27th, from 7 pm until 9 pm. We have a large selection of padlocks, practice locks, handcuffs and other parts, tools are supplied (and can be bought). Conor hosts and oozes enthusiasm and expertise.

Coding: Same night as Lock Picking, bring your laptop and work on your side project or ask for help with a programming problem. Alternate Mondays, the 1st, 15th and 29th May. Please bring your own laptop, we don’t provide the hardware.

The Science Fiction Book Club: This month we’re reading Fifth Head of Cerberus, by Gene Wolfe. It’s a book club, you know how they work; come along, argue, eat cake. Highly recommended that you read the book first, though. Wednesday 29th May, from 7 pm onwards.

Wikipedia Editing: Want to be part of the world’s biggest collaborative venture? Bring along a laptop, and Rebecca will show you how to become a Wikipedia editor. This all happens on the last Wednesdayof the month, May 29th starting at 7 pm.

Team Bodge Wednesday afternoons you will find Team Bodge in the space, taking broken stuff apart, shaking heads sadly and making those noises you hear from emergency plumbers before expertly restoring everything to a better-than-new working state. That’s the advertising blurb anyway. From 3.30 pm onwards, bring along your non-working components and faulty parts, and James and Brendan will be happy to help and offer advice, tools, expertise and the occasional spare part. Members only, check the mailing list for time and date confirmation.

08/04/201902/01/2020

Tog Events in April

Wave Hackers experimental music group.
An experimental audio research & performance group, a place for artists, dreamers, geeks, hackers, nerds, outcasts, weirdos, rebels and scientists to experiment and create. Everything from circuit bending to instrument design and creation. Everyone welcome no matter experience. Come learn and share but most importantly have fun. Hosted by Seb, Friday 19th April, from 7 to 10 pm. Let us know you’re coming on meetup.

Open Social: We open the doors to all-comers once a month for our Open Social event. This month it’s on Saturday 20th April, from 7 pm until the last one leaves. Come and see what happens in Dublin’s only hackerspace. Contributions of food and drink are always welcome. Club Bodge are threatening cheese and wine (bought, not made).

Lock Picking: Conor runs lock picking nights every other Monday, you never know when you may have put your skills into practice… We open padlocks, mostly taken from the Halfpenny Bridge, handcuffs, and various other locks, all without the original keys. Intrigued? Come along to lock-picking on Monday 1st, Monday 15th, and Monday 29th April, starting at 7 pm. Tools provided, and there are some for sale.

Craft Night: The Crafters are an eclectic bunch, engaging in embroidery, sewing, knitting, screen printing, crochet, drawing, painting, and other craft skills. You can bring a project along, start one from scratch, we have materials, tools and supplies to help you out. Every other Wednesday, this month on the 3rd and 17th April. 7 pm start.

Electronics and Micro Controller Night: Gary runs Electronics and Micro Controller night, every Monday that isn’t a Lock-Picking night. We have an electronics room with a dizzying variety of equipment and bits and pieces to get you started if you’re a beginner. Basic kits for sale and lots of expertise on offer. This month’s evenings will be on Monday 8th and the 22nd April, starting at 7 pm and finishing at 9 pm. We don’t supply laptops, so bring your own.

CAD Night: Krzysztof and Louise host the 3D printing and laser cutting night, every second Wednesday (coincides with Craft Night), in April the 3rd, 17th, from 7 pm to 9 pm. We have a working Prusa Mk 3 3D printer, and a Lasersaur for laser cutting. Recommended that you bring your own laptop.

Coding: If you’re looking for a space to work on your own side project, or if you need help with some programming problem, come along to coding nights on alternate Mondays, the 1st, 15th and 29th April. Please bring your own laptop, we don’t provide the hardware.

The Science Fiction Book Club: While you are waiting for the future to arrive, why not be amazed at what others have imagined it will be like? This month we are reading a (non-Culture) novel by Iain M. Banks, Against A Dark Background. We’ll be eating cake and discussing it on Wednesday April 24th, at 7.30 pm.

Wikipedia Editing: Rebecca will instruct on how to become a Wikipedia editor, this happens every last Wednesday of the month, April 24th starting at 7 pm. You can’t edit without a computer, though, so please bring a laptop.

Team Bodge are in the space most Wednesday afternoons, from 3.30 pm until they run out of steam. Bring along your broken or faulty gadgets or computers – or anything else you’d like fixed – and James and Brendan will help you out, with advice, tools, expertise and the occasional spare part. Members only, check the mailing list for time and date confirmation.