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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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I built a minimalist SPA tool using eBPF/XDP to keep ports invisible. First project in Go! (github.com)

submitted 3 days ago by lucy@lemy.nl to c/linux@lemmy.ml

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Hi guys, I wanted to share a project I’ve been working on called xSpa. It's an implementation of Single Packet Authorization that works at the XDP level.

I built this because I wanted something faster and more DDoS-resilient than traditional port-knocking or SPA tools that rely on userspace processing or iptables. Here, the "drop-all" logic happens right at the driver level.

Key bits:

 L1 verification (SipHash) in kernel space.

 L2 (ChaCha20-Poly1305) in Go userspace.

 It uses the eBPF ring buffer for communication.

This is my first Go project and my first shot at Open Source. I’m still a bit of a noob when it comes to kernel-level programming, so I’d love to get some feedback on the architecture and security. If anyone has time to check the code, I’d love to hear your thoughts on how to make it better.

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[–] org@lemmy.org 5 points 3 days ago (3 children)

You mean, you don’t use “init” for all your commits?

[–] lucy@lemy.nl 1 points 3 days ago (2 children)

caught me! still learning the 'professional' way to do things. at least it's better than 'fix1', 'fix2', 'asdfgh'..

[–] org@lemmy.org 1 points 3 days ago (1 children)

“Be sure to commit with a descriptive message after each change”

Assuming you didn’t one-and-done this. Please tell me you didn’t.

[–] lucy@lemy.nl 2 points 3 days ago

I got in the zone :)