+ <item>
+ <title>Pieces of the roaming laptop puzzle in Debian</title>
+ <link>http://people.skolelinux.org/pere/blog/Pieces_of_the_roaming_laptop_puzzle_in_Debian.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Pieces_of_the_roaming_laptop_puzzle_in_Debian.html</guid>
+ <pubDate>Wed, 19 May 2010 19:00:00 +0200</pubDate>
+ <description>
+<p>Today, the last piece of the puzzle for roaming laptops in Debian
+Edu finally entered the Debian archive. Today, the new
+<a href="http://packages.qa.debian.org/libp/libpam-mklocaluser.html">libpam-mklocaluser</a>
+package was accepted. Two days ago, two other pieces was accepted
+into unstable. The
+<a href="http://packages.qa.debian.org/p/pam-python.html">pam-python</a>
+package needed by libpam-mklocaluser, and the
+<a href="http://packages.qa.debian.org/s/sssd.html">sssd</a> package
+passed NEW on Monday. In addition, the
+<a href="http://packages.qa.debian.org/libp/libpam-ccreds.html">libpam-ccreds</a>
+package we need is in experimental (version 10-4) since Saturday, and
+hopefully will be moved to unstable soon.</p>
+
+<p>This collection of packages allow for two different setups for
+roaming laptops. The traditional setup would be using libpam-ccreds,
+nscd and libpam-mklocaluser with LDAP or Kerberos authentication,
+which should work out of the box if the configuration changes proposed
+for nscd in <a href="http://bugs.debian.org/485282">BTS report
+#485282</a> is implemented. The alternative setup is to use sssd with
+libpam-mklocaluser to connect to LDAP or Kerberos and let sssd take
+care of the caching of passwords and group information.</p>
+
+<p>I have so far been unable to get sssd to work with the LDAP server
+at the University, but suspect the issue is some SSL/GnuTLS related
+problem with the server certificate. I plan to update the Debian
+package to version 1.2, which is scheduled for next week, and hope to
+find time to make sure the next release will include both the
+Debian/Ubuntu specific patches. Upstream is friendly and responsive,
+and I am sure we will find a good solution.</p>
+
+<p>The idea is to set up the roaming laptops to authenticate using
+LDAP or Kerberos and create a local user with home directory in /home/
+when a usre in LDAP logs in via KDM or GDM for the first time, and
+cache the password for offline checking, as well as caching group
+memberhips and other relevant LDAP information. The
+libpam-mklocaluser package was created to make sure the local home
+directory is in /home/, instead of /site/server/directory/ which would
+be the home directory if pam_mkhomedir was used. To avoid confusion
+with support requests and configuration, we do not want local laptops
+to have users in a path that is used for the same users home directory
+on the home directory servers.</p>
+
+<p>One annoying problem with gdm is that it do not show the PAM
+message passed to the user from libpam-mklocaluser when the local user
+is created. Instead gdm simply reject the login with some generic
+message. The message is shown in kdm, ssh and login, so I guess it is
+a bug in gdm. Have not investigated if there is some other message
+type that can be used instead to get gdm to also show the message.</p>
+
+<p>If you want to help out with implementing this for Debian Edu,
+please contact us on debian-edu@lists.debian.org.</p>
+</description>
+ </item>
+
+ <item>
+ <title>Magnetstripeinnhold i billetter fra Flytoget og Hurtigruten</title>
+ <link>http://people.skolelinux.org/pere/blog/Magnetstripeinnhold_i_billetter_fra_Flytoget_og_Hurtigruten.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Magnetstripeinnhold_i_billetter_fra_Flytoget_og_Hurtigruten.html</guid>
+ <pubDate>Fri, 21 May 2010 16:00:00 +0200</pubDate>
+ <description>
+<p>For en stund tilbake kjøpte jeg en magnetkortleser for å kunne
+titte på hva som er skrevet inn på magnetstripene til ulike kort. Har
+ikke hatt tid til å analysere mange kort så langt, men tenkte jeg
+skulle dele innholdet på to kort med mine lesere.</p>
+
+<p>For noen dager siden tok jeg flyet til Harstad og Hurtigruten til
+Bergen. Flytoget fra Oslo S til flyplassen ga meg en billett med
+magnetstripe. Påtrykket finner jeg følgende informasjon:</p>
+
+<pre>
+Flytoget Airport Express Train
+
+Fra - Til : Oslo Sentralstasjon
+Kategori : Voksen
+Pris : Nok 170,00
+Herav mva. 8,00% : NOK 12,59
+Betaling : Kontant
+Til - Fra : Oslo Lufthavn
+Utstedt: : 08.05.10
+Gyldig Fra-Til : 08.05.10-07.11.10
+Billetttype : Enkeltbillett
+
+102-1015-100508-48382-01-08
+</pre>
+
+<p>På selve magnetstripen er innholdet
+<tt>;E?+900120011=23250996541068112619257138248441708433322932704083389389062603279671261502492655?</tt>.
+Aner ikke hva innholdet representerer, og det er lite overlapp mellom
+det jeg ser trykket på billetten og det jeg ser av tegn i
+magnetstripen. Håper det betyr at de bruker kryptografiske metoder
+for å gjøre det vanskelig å forfalske billetter.</p>
+
+<p>Den andre billetten er fra hurtigruta, der jeg mistenker at
+strekkoden på fronten er mer brukt enn magnetstripen (det var i hvert
+fall den biten vi stakk inn i dørlåsen).</p>
+
+<p>Påtrykket forsiden er følgende:</p>
+
+<pre>
+Romnummer 727
+Hurtigruten
+Midnatsol
+Reinholdtsen
+Petter
+Bookingno: SAX69 0742193
+Harstad-Bergen
+Dep: 09.05.2010 Arr: 12.05.2010
+Lugar fra Risøyhamn
+Kost: FRO=4
+</pre>
+
+<p>På selve magnetstripen er innholdet
+<tt>;1316010007421930=00000000000000000000?+E?</tt>. Heller ikke her
+ser jeg mye korrespondanse mellom påtrykk og magnetstripe.</p>
+</description>
+ </item>
+
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