Chaos Computer Club - archive feed

Many OS artifacts today are still verified using proprietary, stateful keyring formats. With the "File Hierarchy for the Verification of OS Artifacts (VOA)" an attempt is made to rid the ecosystem of this limitation by implementing a generic lookup directory. With extensibility in mind, this unifying hierarchy currently provides integration for OpenPGP, with further integrations in planning. While...

More than six months have passed since Daan tried to ~~shame~~ gently peer pressure Lennart to actually use the stuff he builds, via a FOSDEM talk: https://fosdem.org/2025/schedule/event/fosdem-2025-4057-particleos-can-we-make-lennart-poettering-run-an-image-based-distribution-/ Did he succeed? Is dogfooding standard practice now in the systemd development process? Or do things like randomly break...

For many years, firewall solutions on Linux have grown and evolved, without any major change, until eBPF. While eBPF can allow very fast and efficient packet filtering, the learning curve doesn't make it easily accessible to non-developers. bpfilter aims to bridge the gap between existing tools (nftables, iptables) and modern technologies such as eBPF. By translating filtering rules into native co...

systemd-sysext provides a nice way to enhance a distribution with a read-only root filesystem without the need to reboot. But there is additional tooling necessary to manage the sysext images: * install an image which is compatible with the installed OS version * update installed images to the newest compatible version * rollback images in case of an OS rollback * cleanup unneeded images In this p...

Landlock is an unprivileged kernel feature that enables all Linux users to sandbox their processes. Complementary to seccomp, developers can leverage Landlock to restrict their programs in a fine-grained way. While Landlock can be used by end users through sandboxer tools, there is currently no well-integrated solution to define security policies tailored to system services. Although AppArmor and...

On image based desktops distributions such as Fedora Atomic desktops and Universal Blue, users are expected to run their graphical applications using Flatpaks and their command line ones using containers. But that approach does not work well for some applications that require more privileges, direct access to devices or kernel interfaces. With systemd system extensions (sysexts), it is possible to...

All the big cloud providers provide your machines with a unique cryptographic identity that can be used to talk to their cloud services securely without having to manage or rotate any cryptographic secrets yourself. For example GCP has Service accounts and AWS has IAM roles. This ubiquity of cloud identity and the seamless integration with all the the services of these cloud providers is one of th...

systemd-confext is a lightweight overlay mechanism for /etc, allowing you to drop in a configuration extension ("confext") bundle and let systemd make it visible to your service as though it was already shipped with the base image. Building on the same extension magic as systemd-sysext, confext also introduces extra features tailored for the /etc use case, such as vpick-ing the newest version and...

Provide a varlink service to access /etc/passwd and /etc/shadow so that no setuid and setgid binaries are necessary for this task. There are two independent "problems" which can be solved with the same idea: all files in /usr should be owned by root:root and no setuid binary should be needed. The first one is a requirement of image based updates of /usr to avoid UID/GID drift, the second one is a...

Let's have an open discussion with systemd developers who are at ASG and users in the audience. We will open with the developers saying what they plan to work on in the near future, and then allow questions / comments from the audience. Licensed to the public under https://creativecommons.org/licenses/by/4.0/de/ about this event: https://cfp.all-systems-go.io/all-systems-go-2025/talk/PXZGEL/

Haven’t you ever wanted to find ways to make your Rust code the most optimal in the world? I know how you feel. This is a talk, where I’d tell you how easy it is to profile your Rust software and how most often the solutions are trivial. This is a story of how I used a few readily-available Open Source tools to achieve huge optimizations in [zbus](https://crates.io/crates/zbus), a pure Rust D-Bus...

Same as every year, a lot has happened in the systemd project since last year's ASG. We released multiple versions, packed with new components and features. This talk will provide an overview of these changes, commenting on successes and challenges, and a sneak peak at what lies ahead. Licensed to the public under https://creativecommons.org/licenses/by/4.0/de/ about this event: https://cfp.all-sy...

Communication is paramount in modern application development. This applies equally well to the process of writing applications and to the code itself. The complexity of the tasks ahead of us calls for a distributed and coordinated development effort, and this often manifests in our code: We design distributed, communicating systems to split complexity and responsibility among many people and teams...

Systing helps you solve problems in minutes rather than days. Out of the box it gives you everything you could possibly need, combined with perfetto’s visualization you will never be confused again. This talk will introduce systing, a tracer that is built on modern BPF tooling, purpose built to debug large applications with complicated interactions. This will be little talk and mostly demo. Two de...

Running **BPF** programs today requires *CAP_BPF* capability, which is an all or nothing BPF capability. But BPF nowadays spans a large area, from simple monitoring to potentially invasive fields like network or tracing. BPF Tokens aims to add fine grained BPF capabilities to systemd units and containers, avoiding to give the whole *CAP_BPF* capability or even worse running the service as privileg...

I'll use these 20 minutes to explain why and why contributing to systemd is a great experience. We'll avoid beating dead horses by not discussing git forges and email, but instead focus on the development experience, from building systemd distribution packages from git main, running integration tests against those distribution packages, debugging failures, writing new tests, and installing the dis...

Linux lacks a coherent security model, and by extension we never defined one for the systemd project either. In this talk I'd like to start changing this, and begin defining some general security design guidelines that we so far mostly followed implicitly, and make them more explicit. After all, systemd to a large degree is involved in security subsystems, from SecureBoot, Measured Boot & TPM, to...

Kurzer Talk, indem ich kurz vorstelle wie wir die Quellcode organisiert haben. https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://pretalx.0x90.space/quellcode-2/talk/QVGLUD/

Im Hackspace sind Systemtelefone von Siemens aufgetaucht. Wir hatten sehr viel Spass mit ihnen und ich will davon erzählen. Zusammen mit zwei anderen Mitgliedern aus dem Nerdberg haben wir uns das "Unify OpenStage 60" Telefon angeschaut, Root-Zugriff bekommen und schlussendlich ein paar nette Anwendungen darauf zum laufen bekommen. Das ganze war aber eher eine längere Reise - von dieser will ich e...

Lightning talk slot, to present some lightning talks. A slot for short talks about different topics, Can be in English or German. Ein Programm Punkt in dem kurze Vorträge über verschiedene Themen vorgetragen werden können. Die Vorträge können in Deutsch oder Englisch gehalten werden. https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://pretalx.0x90.space/quellcode-2/talk/RD9FH...

Lighting Talk about how to make your own personal website and lose your fears and doubts about how to do it. In a world where social media platforms keeps degrading and closing, where more and more places of Internet get subjected to "Enshittification", to the loss of personalization and even censorship, there's this call to oppose this. A counterculture call, to return to "how Internet used to be...

Unsere Beziehungen sind von Herrschaftssystemen vergiftet - wir alle werden willkürlich nach Geschlecht, Ordnung, Herkunft, Leistung, und Fähigkeiten eingeteilt. Wie können wir diese Zwänge abschaffen, und einen Umgang auf Augenhöhe finden? https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://pretalx.0x90.space/quellcode-2/talk/ZLVBAL/

Einführung in die numerische Strömungssimulation mit Free Open Source Software - Grundgleichungen, Software, Beispielrechnungen Aus den Fingern gesogen, ohne Erwartungshaltung https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://pretalx.0x90.space/quellcode-2/talk/G3UJNG/

Du findest dich plötzlich in der **Wildnis**, was tun? Na klar, als allererstes das Smartphone herausholen und Empfang prüfen. Verdammt, wo bin ich eigentlich? In diesen Talk stelle ich dir drei Tolle Apps vor, die dir in der Wildnis eine große Hilfe sein werden. Auch im Bastler*in Alltag können sie aber sehr nützlich sein. https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://...

Introducing a fresh'n tiny DJing Software for Linux to battle the enshittification of DJing The art of DJing has been shifting and progressing over the last 2 decades by the introduction of digital djing. But since then it has been in the greedy hands of a couple of big players, namely Pioneer (now AlphaTheta). Cloud & subscription is now on the plate, with hefty price tags. Time to liberate the A...