Banning “problem countries” from your Linux server

It’s not a secret that these days most server hacking attempts originate from chinese IP addresses. A lot of attempts originate from other countries like South Korea and Indonesia as well. It seems that in those countries (cyber-)law-enforcement and technological advancement don’t correlate. I agree that a server has to be able to sustain non-flooding attacks just by using a proper and secure server configuration. But what if almost all traffic from those countries are automated vulnerability scans? Continue reading “Banning “problem countries” from your Linux server”

SSO with SAP Logon Tickets and Java

To validate/verify a SAP Logon Ticket in a non-SAP Java environment you have to call into native libraries. Fortunately there’s some Java sample code provided in the SAPSSOEXT library archive.

Go to service.sap.com (you need a valid user and download permissions) -> Download -> Support Packages and Patches -> Entry by Application Group -> Additional Components, follow the SAPSECULIB and SAPSSOEXT links and download the library versions for your operating system. You’ll also need SAPCAR to extract those .SAR files. Both libraries – sapsecu.dll and sapssoext.dll – are needed to validate a SAP Logon Ticket. Continue reading “SSO with SAP Logon Tickets and Java”

Jailbreak/Activate IPSF 1.1.3 iPhone with 04.03.13_G

The 1.1.3 soft-upgrade is called a soft-upgrade because it won’t update your baseband firmware to the 1.1.3 software level (04.03.13_G). This was necessary because as of today there’s no anySIM hack for the new baseband.

Added 2008-2-23: You don’t need Singal.app if you run anySIM 1.1.3 on your IPSF iPhone. I just tested it today and it works!

Added 2008-2-29: Looking for 1.1.4? See here!  

If you own an iPhoneSimFree’ed (IPSF) 1.1.2 iPhone (or 1.1.1) with the 3.9 bootloader you’re able to fully upgrade to 1.1.3 including baseband! Why would you want the new baseband if you could run 1.1.3 with the older baseband firmware? I don’t really have an answer to that. I just wanted to make sure the software and the baseband firmware in my iPhone are on the same level as intended by Apple’s software engineers.

Continue reading “Jailbreak/Activate IPSF 1.1.3 iPhone with 04.03.13_G”

Uneven iMac Displays

Test your aluminum iMac if it has a good or bad display

 

Added 2008-4-1: Apple being sued over iMac display quality!
“Dazzling displays: Your photos, movies, and games will come to life in rich, vivid color thanks to the new glossy widescreen display on every iMac. …delivering greater performance for everything from enhancing photos to playing games and more.”

This is how Apple describes the displays in the new aluminum iMac. But there seems to be a vast difference between the marketing promises and reality. Users affected by bad iMac displays report their experiences as follows (these are just a few excerpts out of dozens of statements in Apple’s own discussion forum):

“I’m a PC-to-Mac switcher and purchased a 24” imac about a month ago and returned it for a full-refund due to the obvious gradient.”

Continue reading “Uneven iMac Displays”

Setting up a Linux UT3 game server

While the installation of the Linux binary for the Unreal Tournament 3 Server is dead simple, some very brave game server administrators apparently chose to run the server with root permissions because there’s no useful server start script. This usually is an exceptionally bad idea for everything that opens ports on an Internet server.

Here’s a very simple start script that starts the UT3 server with a different account which you have to create using the groupadd/useradd command. In my case I’m using user game in group game. The script will sudo to this less powerful account and then start a botless deathmatch UT3 server. The server will continue to run after you close your shell. Well, at least until the server crashes, which it does frequently. In its current form the script has to be put into the ut3-dedicated/Binaries directory. Continue reading “Setting up a Linux UT3 game server”