Was manche Leute in ihrer „Datenschutzerklärung“ stehen haben …

23. Juli 2020 in Sonstiges.

Gesehen auf https://t3n.de/datenschutz/ am 23. Juli 2020, Zitat: „Eine Einwilligung in den Einsatz des Facebook-Pixels darf nur von Nutzern, die älter als 13 Jahre alt sind, erklärt werden. Falls Sie jünger sind, bitten wir Sie, Ihre Erziehungsberechtigten um Erlaubnis zu fragen.“

Das von t3n als „Datenschutzerklärung“ bezeichnete Dokument ist 110991 Zeichen in 13945 Wörtern lang; das obige Zitat erfolgt nach 40% des gesamten Texts bzw. nach 5681 Wörtern, die man hat lesen müssen, um bei dieser Information anzukommen. Eine so relevante Information, die nämlich mitteilt, dass unter 13 Jahre alte Benutzer die Webseite nur mit Einwilligung ihrer Erziehungsberechtigten verwenden dürfen, halte ich persönlich für reichlich unzugänglich.

Noch ein Zitat aus besagtem Dokument: „Facebook Inc. mit Sitz in den USA ist für das us-europäische Datenschutzübereinkommen „Privacy Shield“ zertifiziert, welches die Einhaltung des in der EU geltenden Datenschutzniveaus gewährleistet.“

Diese Aussage ist mit einem Urteil des europäischen Gerichtshofs vom 16. Juli 2020 als falsch festgestellt, und eine Änderung des Dokuments wird nötig sein. Das wäre vieleicht ein guter Anlass, auch an anderen Stellen in diesem Dokument für mehr Klarheit zu sorgen.

Endlich Sommer …

25. April 2020 in Sonstiges.

… im April. 😯

Determining User Access on a Linux Filesystem with „Classic Permissions“

30. November 2021 in Administration, GNU/Linux.

Introduction

Looking at a Linux filesystem, checking if a certain file or directory is accessible for reading, writing or executing by certain users or groups poses interesting challenges.

Let the basic and seemingly simple question be: „Given a user X and a file Y, can it be determined if X has access to Y, and if yes, how can it be determined?“ A simple answer was: „Let X try to access Y, and if it does not work, X does not have that kind of access.“ However, this may not be feasible: The users, files and directories in question may not exist yet. More generally, access by users to files and directories should be predictable; appropriate access restrictions should be placed in advance, not after exposing possibly sensitive information. Also, certain types of access, such as deleting a file or directory, can not be simulated in a safe manner.

Moreover, a test procedure that just involves „trying to access the file“ may be incomplete: Just because the way the test procedure has attempted access did not succeed, that does not mean that there is no procedure at all by which the user in question can access the file.

This article investigates Linux filesystems that implement the semantics of „classic UNIX permissions“ in an effort to find more exhaustive methods of determining access.

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AD-Precreation using ktutil, kinit and adcli

4. Dezember 2019 in Administration, GNU/Linux.

Using computer object precreation you can enable machines to join an Active Directory domain with knowledge of just one dedicated one-time-password. Combined with delegation you can offload management of computer objects to an otherwise unprivileged AD user.

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Drawing a Yellow Rectangle on Android

26. November 2021 in Programmierung.

As an addendum to my previous article, there now also is an Android App „YellowRectangle“ that draws a yellow rectangle and terminates on the first touch event. It runs on Android version 4.0.3 (Ice Cream Sandwich MR1) and upward. It is written in Java and C++ and uses the Allegro game development library (http://liballeg.org/).

YellowRectangle running on Android 7.0 in the Genymotion emulator.

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Drawing A Yellow Rectangle

25. März 2018 in Programmierung.

Premise

On the weekend i wanted to perform the task of drawing a yellow rectangle programmatically onto the screen of a Personal Computer:

  • The program would feature a viewport that occupies the entirety of the primary display of the PC.
  • On the viewport, 640 pixels could be adressed in width, 480 in height.
  • The viewport would be drawn in black color by default.
  • A yellow, filled rectangle would be drawn from an upper left corner at pixel coordinates 10 from the left, 20 from the top to a lower right corner at 100 from the left, 75 from the top.

  • When having drawn the yellow rectangle, the program would indefinately await any keypress and then shut down.

I solved this task using several different programming languages and toolkits, having the following goals for the implementation:

  • The program does a simple thing, so it should require little processing and memory resources.
  • The program should still work in 24 months from now.
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Creative E-MU 1616m PCIe on Windows 10 64bit

27. Mai 2021 in Multimedia, Technik.

Update: Update 1903 of Windows 10 introduced breaking changes that Creative will not fix anymore. The device can still be brought to operation following this article on answers.microsoft.com by Mr. Freddie Stjerna. Having performed the procedure described therein, my 1616m PCIe works flawlessly on Win10Pro64, also as an ASIO device for Ableton 10 (64bit).
Update no. 2: Unfortunately, the 64-bit ASIO driver as installed using the procedure described in the previous update delivers very bad performance when used with Ableton Live 11. Status now is that i will not use the device in Windows anymore, only in Linux. 😎

On a PC running Win10Pro64 that has no Firewire port i needed a 4in4out audio solution functioning as an ASIO device.

So i dug out my E-MU 1616m PCIe, and – fearing that it would show severe compatibility issues – installed the most recent driver (EmuPMX_PCDrv_US_2_30_00.exe, July 15th 2011). To my surprise, the device started working immediately. So far i have not found any unsupported or problematic features (at 48 kHz samplerate i use WDM audio output, symmetrical input with zero-latency monitoring and ASIO sends and output to speakers through a 4-band EQ as DSP insert).

I think the E-MU 1616m PCIe is a great device:

  • 10 years after i bought it, it works as on the first day.
  • It has good and solid performance, i permanently run it with 10ms buffer size, which in Ableton Live adds on to 23.3 ms global round-trip latency, and i am yet to encounter any dropout or instability.
  • PatchMix looks and feels very functional (apart from the brushed Aluminium skin which i find quite funny and nostalgic). Since it has spent many years in maturity, having no „software development“ bloating it with useless features and workflows, it runs rock solid and lightning fast on a modern PC.
  • The breakout box (called „Microdock“) has massive connectivity:
    • copper S/PDIF, AES or EBU (really!),
    • optical ADAT or S/PDIF,
    • four balanced 6.35mm input jacks,
    • two XLR/jack combo inputs,
    • six balanced 6.35mm output jacks,
    • three unbalanced 3.5mm stereo output jacks,
    • a dedicated 6.35 mm headphone output jack with hardware volume control and
    • a stereo pair of RCA inputs plus GND (Phono).
  • It works with Linux (using emutrix instead of PatchMix).

This is the best Creative product ever – ah wait, it’s not really by Creative … 😉

xdraw 1.1

26. November 2021 in Multimedia, Programmierung.

I was very pleased to notice that my small Xlib-utility xdraw has made it across the years unscathed. It compiled after 11 years of complete lack of code or build system maintenance. Hail to the stability of the X Library!

However, i found the visual quality of the drawing results a bit lacking – the drawn lines are too uneasy. So i have added weighted average smoothing to the drawn lines.

xdraw in action.

I have released this improvement as version 1.1 of xdraw here: https://gitlab.tk-sls.de/tilman/xdraw/tree/1.1

Project information not readable.