August 15, 2019

APT Patterns

If you have ever used aptitude a bit more extensively on the command-line, you’ll probably have come across its patterns. This week I spent some time implementing (some) patterns for apt, so you do not need aptitude for that, and I want to let you in on the details of this merge request !74. so, what are patterns? Patterns allow you to specify complex search queries to select the packages you want to install/show. ... Read more

June 13, 2019

Encrypted Email Storage, or DIY ProtonMail

In the previous post about setting up a email server, I explained how I setup a forwarder using Postfix. This post will look at setting up Dovecot to store emails (and provide IMAP and authentication) on the server using GPG encryption to make sure intruders can’t read our precious data! Architecture The basic architecture chosen for encrypted storage is that every incoming email is delivered to postfix via LMTP, and then postfix runs a sieve script that invokes a filter that encrypts the email with PGP/MIME using a user-specific key, before processing it further. ... Read more

January 5, 2019

Setting up an email server, part 1: The Forwarder

This week, I’ve been working on rolling out mail services on my server. I started working on a mail server setup at the end of November, while the server was not yet in use, but only for about two days, and then let it rest. As my old shared hosting account expired on January 1, I had to move mail forwarding duties over to the new server. Yes forwarding - I do plan to move hosting the actual email too, but at the moment it’s “just” forwarding to gmail. ... Read more

December 24, 2018

An Introduction to Go

(What follows is an excerpt from my master’s thesis, almost all of section 2.1, quickly introducing Go to people familiar with CS) Go is an imperative programming language for concurrent programming created at and mainly developed by Google, initially mostly by Robert Griesemer, Rob Pike, and Ken Thompson. Design of the language started in 2007, and an initial version was released in 2009; with the first stable version, 1.0 released in 2012 1. ... Read more

December 1, 2018

Migrating web servers

As of today, I migrated various services from shared hosting on uberspace.de to a VPS hosted by hetzner. This includes my weechat client, this blog, and the following other websites: jak-linux.org dep.debian.net redirector mirror.fail Rationale Uberspace runs CentOS 6. This was causing more and more issues for me, as I was trying to run up-to-date weechat binaries. In the final stages, I ran weechat and tmux inside a debian proot. ... Read more

October 25, 2018

Migrated website from ikiwiki to Hugo

So, I’ve been using ikiwiki for my website since 2011. At the time, I was hosting the website on a tiny hosting package included in a DSL contract - nothing dynamic possible, so a static site generator seemed like a good idea. ikiwiki was a good social fit at the time, as it was packaged in Debian and developed by a Debian Developer. Today, I finished converting it to Hugo. ... Read more

October 13, 2018

The demise of G+ and return to blogging (w/ mastodon integration)

I’m back to blogging, after shutting down my wordpress.com hosted blog in spring. This time, fully privacy aware, self hosted, and integrated with mastodon. Let’s talk details: In spring, I shutdown my wordpress.com hosted blog, due to concerns about GDPR implications with comment hosting and ads and stuff. I’d like to apologize for using that, back when I did this (in 2007), it was the easiest way to get into blogging. ... Read more

December 31, 2017

A year ends, a new year begins

2017 is ending. It’s been a rather uneventful year, I’d say. About 6 months ago I started working on my master’s thesis - it plays with adding linear types to Go - and I handed that in about 1.5 weeks ago. It’s not really complete, though - you cannot actually use it on a complete Go program. The source code is of course available on GitHub, it’s a bunch of Go code for the implementation and a bunch of Markdown and LaTex for the document. ... Read more

October 23, 2017

APT 1.6 alpha 1 - seccomp and more

I just uploaded APT 1.6 alpha 1, introducing a very scary thing: Seccomp sandboxing for methods, the programs downloading files from the internet and decompressing or compressing stuff. With seccomp I reduced the number of system calls these methods can use to 149 from 430. Specifically we excluded most ways of IPC, xattrs, and most importantly, the ability for methods to clone(2), fork(2), execve(2), and execveat(2). Yes, that’s right - methods can no longer execute programs. ... Read more

September 24, 2017

APT 1.5 is out

APT 1.5 is out, after almost 3 months the release of 1.5 alpha 1, and almost six months since the release of 1.4 on April 1st. This release cycle was unusually short, as 1.4 was the stretch release series and the zesty release series, and we waited for the latter of these releases before we started 1.5. In related news, 1.4.8 hit stretch-proposed-updates today, and is waiting in the unapproved queue for zesty. ... Read more

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