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Umbauen statt Zurückzahlen

14 February 2012, 8:00 am

Bundesminister Bahrs Forderung, die Mitglieder der Krankenkasse in Deutschland an den derzeitig erwirtschafteten Überschüssen teilhaben zu lassen, kann durchaus als ein wahlkampftaktisches Manöver gesehen werden (vergleiche auch den Audiokommentar von Stephan Ueberbach). Setzt man derzeit den Wert (wie in den Medien genannt) 16 Milliarden Euro, die “überschüssig” sind, ins Verhältnis zum Gesamtumsatz, so kommt man auf magere neun Prozent – eine “Rendite”, die manch einem Anteilseigner an der Börse wohl eher ein Lächeln denn Begeisterungsstürme abringen würde. Somit hört sich die ganze Aktion also schön an und kann hervorrangend medienwirksam verwendet werden – doch täuscht dieses “mediale Trommeln”. Continue reading ‘Umbauen statt Zurückzahlen’ »

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Blog’s Second Anniversary

21 January 2012, 12:00 am

Today’s the Blog’s Second Anniversary of this Blog. Since that a number of interesting post which (based on hits) apparently interest a larger community have been born. Continue reading ‘Blog’s Second Anniversary’ »

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GPGOL of GPG4WIN and Umlauts

9 January 2012, 9:29 pm

Recently I stumbled over the problem that the GPGOL addin of GPG4WIN (version 2.1.0) apparently has some problems with the German umlauts. At the bottom it turned out that it could not deal well with the message encoding. Here is how I managed to work around the problem. Continue reading ‘GPGOL of GPG4WIN and Umlauts’ »

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mv_crypto Oops with OpenSWAN / NETKEY on Excito Bubba3

27 December 2011, 9:18 pm

Today I had to install another Bubba3 server together with an VPN service. Having the need of allowing Windows systems to logon with its native client (via VPN transport mode) my choice went to Openswan. After learning that the automatic detection of the KLIPS and/or NETKEY stack is broken in the case of road warriors with NAT enabled, I added the line

config setup
  # ...
  protostack netkey

in the /etc/ipsec.conf file (please note that this may be necessary, even though KLIPS may not be available and autodetection of the stack falls back to NETKEY support). That worked out during my first tests. However, soon after I got the problem that the kernel oops’ed with an error message like

kernel: Internal error: Oops: 5 [#1]
kernel: Process mv_crypto (pid: 563, stack limit = 0xdfb80270)
kernel: Stack: (0xdfb81ef4 to 0xdfb82000)

Continue reading ‘mv_crypto Oops with OpenSWAN / NETKEY on Excito Bubba3’ »

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Papandreou’s Referendum – ein Sieg für die Demokratie

1 November 2011, 8:40 pm

Am gestrigen Tag hat der griechische Ministerpräsident Papandreou ankündigt, daß er beabsichtigt, das griechische Volk über die Annahme der vor sechs Tagen ausgehandelten Maßnahmen zur Eurostabilität inklusive eines “Haircuts” für griechische Staatsanleihen um 50% in einem Referendum abstimmen zu lassen. Für die Börse, die finanztechnisch dies heute nun aufarbeiten mußte, war diese Erkenntnis niederschmettern. Neben dem destraströsen Ergebnis an den Börsen gaben sich die meisten europäischen politischen Kräfte irritiert über diesen Schritt. Und doch sollte dieser Schritt Papandreous eigentlich gewürdigt werden. Continue reading ‘Papandreou’s Referendum – ein Sieg für die Demokratie’ »

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Hebelwirkung am EFSF – “Wohl ist des Hebels Macht, wenn er denn richtig angebracht”

20 October 2011, 11:47 pm

Politische Diskussionen sind üblicherweise keine Begründung für mich einen Blog-Eintrag zu verfassen. In der aktuellen Streitfrage über die Verwendung einer “Hebelwirkung” für den zukünftigen “Eurorettungsschirm” (EFSF) erscheint mir allerdings “Not an der Tastatur” zu sein, denn es wird viel über die möglichen Handlungen berichtet, allerdings die Konsequenzen aus dem Handeln nicht transparent gemacht. Continue reading ‘Hebelwirkung am EFSF – “Wohl ist des Hebels Macht, wenn er denn richtig angebracht”’ »

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Subversion Installation on Debian with Plesk – Without Security Issue

13 October 2011, 10:14 pm

Available at http://www.bluehelp.de/tutorial/svn-debian-plesk.html there is a good (German) description on how to set up a Subversion repository on a Debian system if also Parallels Plesk Panel is installed. However, there is one thing that needs improvement there: When generating the HTTP password file with the two commands it happens with

htpasswd –cs /var/svnrepo/dav_svn.passwd alice
htpasswd –s /var/svnrepo/dav_svn.passwd tom

However, this implies that the password file is being generated with unix rights rw-r–r– and author/group with the current user. It is well-known that password files which are world-readable are bad idea in any case and cause a security risk.
Thus, I would like to enhance the statement on that page there by recommending to issue the following additional commands:

chown .www-data /var/svnrepo/dav_svn.passwd
chmod o-r /var/svnrepo/dav_svn.passwd

By this the file still is readable by the Apache Webserver, but no “other” users will be allowed to read the contents of the hashed password file.

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Acer’s WebCam Windows XP not shutting down anymore

30 September 2011, 8:02 pm

Sometimes you could go nuts: Having sent in an Acer TravelMate 7730G to the German Acer Support for replacing the mainboard, it turns out afterwards that the operating system does not shut down properly anymore. After some long time googling around you detect that this might be related to the driver of the integrated WebCam. The device manager reports it to be a “Acer Crystal Eye Webcam” wheras the manufactor of the driver is Suyin.
Many forums on the web recommend to reinstall the driver to fix the problem, however, that turns out to be not successful in this case. Only after I detected this post I got the important hint: it’s the point that the power management of this driver does not work well. By deactivating the power management of the USB root hub to where the camera is attached, you are able to fix the problem. How to detect the root hub in question is a bit more complex than stated at the post there: As the camera itself is a composite USB device, the hardware that is connected to the hub is not the camera itself, but the composite device. At the end you need to look out for an USB root hub where the composite device is attached to. After finding that fixing the problem was a piece of cake (see recommendation provided by the post mentioned above).

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Funny Linux Kernel

21 May 2011, 10:57 am

In knew that Linux is a funny thing, but that its kernel is humorous was new to me today when I entered the following command into the command prompt:

lenny:/# cat /proc/swaps
Filename                                Type            Size    Used    Priority
/dev/null                               partition       1048576 3440    -1

Swapping out main memory pages into /dev/null might be performed very efficiently, however, I doubt that reading them back will be as easy.

The solution to this miracle is very short: The funny linux kernel is running in a virtual machine environment. The swap partition is out of its domain and thus it does not know how to reference to it.

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Strongswan on the Excito Bubba3 Server

13 May 2011, 11:28 pm

Having become a proud owner of a Bubba3 server, I was very pleased to make notice of two facts: Excito, the manufaturer of the B3, has built the system internally on Debian Squeeze and provides (though unsupported) additional information via Wiki pages how to leverage any functionality that is available with this distribution, if supported by the system’s architecture (ARMEL). My special interest has been caught by the wiki page explaining how to install a VPN client/server on the box as in my system setup at home, I need this feature to allow access to the internet. Though the description is very accurate (kudos to you!) and easy to follow, I still had the impression that a normal user should not be forced to recompile the kernel delivered natively by Excito. Continue reading ‘Strongswan on the Excito Bubba3 Server’ »

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