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How-to Open Source

Securing fetchmail with improved TLS parameters

fetchmail is the workhorse for downloading mail from legacy addresses. This does not mean that you want to be limited to legacy security for your passwords or mail contents. TLS Interposer helps upgrade security.

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How-to Open Source

Upgrade ejabberd to the latest TLS security [UPDATE#2, 2014-06-05]

ejabberd is a very fine XMPP server. However, it has very few options to configure its SSL and TLS security settings away from the very weak OpenSSL defaults. The TLS Interposer makes securing TLS used by ejabberd a breeze.

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How-to Open Source

Upgrading Apache 2.2 OpenSSL security with TLS Interposer

Undoubtedly, you will have heard about the weaknesses of old SSL and TLS protocol versions and ciphers. Web browsers have been updated; but the server administrators are left alone: For stability reasons, many run long-term support editions such as Ubuntu 12.04 LTS. Even without that, most will stick to the reliability of Apache 2.2, hesitant […]

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How-to Open Source

Eliminate BEAST, CRIME, Lucky13, RC4, SSLv3 weaknesses from binary/legacy applications

Security is hard. Security that works with a variety of platforms under a flurry of circumstances with an endless choice of applications is practically impossible. SSL and TLS, the Internet security workhorses, try to achieve this feat … and fail from time to time. While some software has been updated, not all of it has. […]

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How-to

Keep Time Machine backups from slowing down your server

Time Machine backups to a Linux machine running Netatalk is a very convenient way of safeguarding your data. However, the I/O load on the server machine can sometimes become very high. Here is a quick hack to improve this, if you need AppleTalk AFP services mostly for TimeMachine.

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General How-to

School vacation calendar for Stein am Rhein

The two schools in Stein am Rhein, primary school Schanz and secondary school Hopfengarten, both publish their vacation calendars online. However, these calendars are written as formatted text and published as PDF. This post describes how you can import their calendars into your electronic calendar, such as Outlook or iCal. [This article is also available […]

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Fun

Production Planning System for Cookie Clicker (Updated)

Are you serious about your Cookie Clicker production enterprise of intergalactic dimensions? Then you need this time-shifting production planning system with wormhole and cookieverse capability!

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How-to Open Source

TimeMachine corruption: Use btrfs :-)

I do run TimeMachine backups from my MacBook to my Linux server, which is very convenient. However, I sometimes close the MacBook while the backup is going on and walk away. I believe this is the cause for the TimeMachine corruptions that I have once in a while. Even though I tried fixing these TimeMachine […]

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How-to Open Source

Simple versioned TimeMachine-like backup using rsync

Over many years, I have dealt with scripts that do backup versioning, i.e., maintain multiple backups. Due to their flexibility, they have been complex to understand and configure. Here is a simple rsync-based tool with a different focus: The experienced systems administrator who wants to keep his system’s complexity down.

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Publications

Utilizing Photo Sharing Websites for Cloud Storage Backends