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mardi 12 septembre 2017

The war on SPAM: an review of the real world tools

Anti-spam techniques review: a few hints and tools review from my own experience.

Spam mesage are very common these days, but filtering them out is not as easy as it seems. The filtering techniques have evolved at the same rate than the spammers' evasive techniques, and the risk of filtering out a legitimate message is greater than ever.

It is also quite difficult to find good and up-to-date counter-measures list that anyone can implement.

Here is a summary of the anti-spam strategies I used / am still using. I hope it will help you understanding today's threats, and build your own solutions.

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lundi 17 juillet 2017

Mémo rsync pour mes collègues

Un rappel de l'usage pratique de rsync pour mes collègues qui oublient tout le temps les commandes à taper.

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mardi 11 juillet 2017

Configure Wordpress for Performance and Stability

Wordpress is a very common CMS nowadays, and works well out-of-the-box. But when it comes to Performance and Security, its default options are not hardening it enough.

This topic has been discussed a lot on Internet, but here are my tips, as a web developer and sysadmin.

Performance : the main culprits

On a public websites, the slowness can com from :

  • Network : your provider has as slow network, a huge traffic load, or the user simply has a bad connection
  • Database access : the provider's database may be under load, you query's sizes may be too important, or the access time between the script and the datbase is just "usually slow".
  • Disk access : the disk where is stored your files may be slow, or does not have proper in-ram caching
  • CPU : the CPU of the machine where you site is hosted may be slow, or you are on a low-cost VPS

There is no "miracle solution" for a badly designed website, but in the vast majority of cases, we could help a bit with simple solutions.

Security : the main threats

The main threat in a Wordpress installation is the updates execution. You should update your modules, themes, and core as soon as possible.

Custom and unmaintained modules and themes can also become a threat as they are not updated anymore, and can contain exploitable leaks.

There are several way to prevent your site from leaking too many informations on its "healthiness". It can give you some time to update your website before its exploitation by hackers.

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mercredi 4 janvier 2017

Cinq raisons qui prouvent que l'IA de Portal est la même que celle de WiiFit

aperture_wiifit.jpg

On m'a fait jouer (de force) à Wii Fit il y a quelques jours, et cette fois c'est une certitude : l'IA qui ponctue l'avancée du joueur dans Portal est la même que celle du jeu Wii Fit. Voici pourquoi.

Nota Bene : cet article est le produit d'un Programme Expérimental d'Enrichissement du Blog par Recyclage d'Articles Restés en Brouillon (PEEBRARB).

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samedi 30 juillet 2016

Sample public calendar for ownCloud using ICS parser

When ownCloud removed the ability to share a calendar publicly, I had no other choice than forcing my acquaintances to register to my ownCloud.

I didn't want that, so I implemented my own solution.

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