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13 <h1>
14 <a href="">Petter Reinholdtsen</a>
15
16 </h1>
17
18 </div>
19
20
21
22 <div class="entry">
23 <div class="title"><a href="Forcing_new_users_to_change_their_password_on_first_login.html">Forcing new users to change their password on first login</a></div>
24 <div class="date">2010-05-02 13:47</div>
25 <div class="body">
26 <p>One interesting feature in Active Directory, is the ability to
27 create a new user with an expired password, and thus force the user to
28 change the password on the first login attempt.</p>
29
30 <p>I'm not quite sure how to do that with the LDAP setup in Debian
31 Edu, but did some initial testing with a local account. The account
32 and password aging information is available in /etc/shadow, but
33 unfortunately, it is not possible to specify an expiration time for
34 passwords, only a maximum age for passwords.</p>
35
36 <p>A freshly created account (using adduser test) will have these
37 settings in /etc/shadow:</p>
38
39 <blockquote><pre>
40 root@tjener:~# chage -l test
41 Last password change : May 02, 2010
42 Password expires : never
43 Password inactive : never
44 Account expires : never
45 Minimum number of days between password change : 0
46 Maximum number of days between password change : 99999
47 Number of days of warning before password expires : 7
48 root@tjener:~#
49 </pre></blockquote>
50
51 <p>The only way I could come up with to create a user with an expired
52 account, is to change the date of the last password change to the
53 lowest value possible (January 1th 1970), and the maximum password age
54 to the difference in days between that date and today. To make it
55 simple, I went for 30 years (30 * 365 = 10950) and January 2th (to
56 avoid testing if 0 is a valid value).</p>
57
58 <p>After using these commands to set it up, it seem to work as
59 intended:</p>
60
61 <blockquote><pre>
62 root@tjener:~# chage -d 1 test; chage -M 10950 test
63 root@tjener:~# chage -l test
64 Last password change : Jan 02, 1970
65 Password expires : never
66 Password inactive : never
67 Account expires : never
68 Minimum number of days between password change : 0
69 Maximum number of days between password change : 10950
70 Number of days of warning before password expires : 7
71 root@tjener:~#
72 </pre></blockquote>
73
74 <p>So far I have tested this with ssh and console, and kdm (in
75 Squeeze) login, and all ask for a new password before login in the
76 user (with ssh, I was thrown out and had to log in again).</p>
77
78 <p>Perhaps we should set up something similar for Debian Edu, to make
79 sure only the user itself have the account password?</p>
80
81 <p>If you want to comment on or help out with implementing this for
82 Debian Edu, please contact us on debian-edu@lists.debian.org.</p>
83
84 <p>Update 2010-05-02 17:20: Paul Tötterman tells me on IRC that the
85 shadow(8) page in Debian/testing now state that setting the date of
86 last password change to zero (0) will force the password to be changed
87 on the first login. This was not mentioned in the manual in Lenny, so
88 I did not notice this in my initial testing. I have tested it on
89 Squeeze, and '<tt>chage -d 0 username</tt>' do work there. I have not
90 tested it on Lenny yet.</p>
91 </div>
92 <div class="tags">
93
94
95
96 Tags: <a href="tags/debian edu">debian edu</a>, <a href="tags/english">english</a>, <a href="tags/nuug">nuug</a>, <a href="tags/sikkerhet">sikkerhet</a>.
97
98 </div>
99 </div>
100 <div class="padding"></div>
101
102 <div class="entry">
103 <div class="title"><a href="Thoughts_on_roaming_laptop_setup_for_Debian_Edu.html">Thoughts on roaming laptop setup for Debian Edu</a></div>
104 <div class="date">2010-04-28 20:40</div>
105 <div class="body">
106 <p>For some years now, I have wondered how we should handle laptops in
107 Debian Edu. The Debian Edu infrastructure is mostly designed to
108 handle stationary computers, and less suited for computers that come
109 and go.</p>
110
111 <p>Now I finally believe I have an sensible idea on how to adjust
112 Debian Edu for laptops, by introducing a new profile for them, for
113 example called Roaming Workstations. Here are my thought on this.
114 The setup would consist of the following:</p>
115
116 <ul>
117
118 <li>During installation, the user name of the owner / primary user of
119 the laptop is requested and a local home directory is set up for
120 the user, with uid and gid information fetched from the LDAP
121 server. This allow the user to work also when offline. The
122 central home directory can be available in a subdirectory on
123 request, for example mounted via CIFS. It could be mounted
124 automatically when a user log in while on the Debian Edu network,
125 and unmounted when the machine is taken away (network down,
126 hibernate, etc), it can be set up to do automatic mounting on
127 request (using autofs), or perhaps some GUI button on the desktop
128 can be used to access it when needed. Perhaps it is enough to use
129 the fish protocol in KDE?</li>
130
131 <li>Password checking is set up to use LDAP or Kerberos
132 authentication when the machine is on the Debian Edu network, and
133 to cache the password for offline checking when the machine unable
134 to reach the LDAP or Kerberos server. This can be done using
135 <a href="http://www.padl.com/OSS/pam_ccreds.html">libpam-ccreds</a>
136 or the Fedora developed
137 <a href="https://fedoraproject.org/wiki/Features/SSSD">System
138 Security Services Daemon</a> packages.</li>
139
140 <li>File synchronisation with the central home directory is set up
141 using a shared directory in both the local and the central home
142 directory, using unison.</li>
143
144 <li>Printing should be set up to print to all printers broadcasting
145 their existence on the local network, and should then work out of
146 the box with CUPS. For sites needing accurate printer quotas, some
147 system with Kerberos authentication or printing via ssh could be
148 implemented.</li>
149
150 <li>For users that should have local root access to their laptop,
151 sudo should be used to allow this to the local user.</li>
152
153 <li>It would be nice if user and group information from LDAP is
154 cached on the client, but given that there are entries for the
155 local user and primary group in /etc/, it should not be needed.</li>
156
157 </ul>
158
159 <p>I believe all the pieces to implement this are in Debian/testing at
160 the moment. If we work quickly, we should be able to get this ready
161 in time for the Squeeze release to freeze. Some of the pieces need
162 tweaking, like libpam-ccreds should get support for pam-auth-update
163 (<a href="http://bugs.debian.org/566718">#566718</a>) and nslcd (or
164 perhaps debian-edu-config) should get some integration code to stop
165 its daemon when the LDAP server is unavailable to avoid long timeouts
166 when disconnected from the net. If we get Kerberos enabled, we need
167 to make sure we avoid long timeouts there too.</p>
168
169 <p>If you want to help out with implementing this for Debian Edu,
170 please contact us on debian-edu@lists.debian.org.</p>
171 </div>
172 <div class="tags">
173
174
175
176 Tags: <a href="tags/debian edu">debian edu</a>, <a href="tags/english">english</a>, <a href="tags/nuug">nuug</a>.
177
178 </div>
179 </div>
180 <div class="padding"></div>
181
182 <div class="entry">
183 <div class="title"><a href="Great_book___Content__Selected_Essays_on_Technology__Creativity__Copyright__and_the_Future_of_the_Future_.html">Great book: "Content: Selected Essays on Technology, Creativity, Copyright, and the Future of the Future"</a></div>
184 <div class="date">2010-04-19 17:10</div>
185 <div class="body">
186 <p>The last few weeks i have had the pleasure of reading a
187 thought-provoking collection of essays by Cory Doctorow, on topics
188 touching copyright, virtual worlds, the future of man when the
189 conscience mind can be duplicated into a computer and many more. The
190 book titled "Content: Selected Essays on Technology, Creativity,
191 Copyright, and the Future of the Future" is available with few
192 restrictions on the web, for example from
193 <a href="http://craphound.com/content/">his own site</a>. I read the
194 epub-version from
195 <a href="http://www.feedbooks.com/book/2883">feedbooks</a> using
196 <a href="http://www.fbreader.org/">fbreader</a> and my N810. I
197 strongly recommend this book.</p>
198 </div>
199 <div class="tags">
200
201
202
203 Tags: <a href="tags/english">english</a>, <a href="tags/fildeling">fildeling</a>, <a href="tags/nuug">nuug</a>, <a href="tags/opphavsrett">opphavsrett</a>, <a href="tags/personvern">personvern</a>, <a href="tags/sikkerhet">sikkerhet</a>, <a href="tags/web">web</a>.
204
205 </div>
206 </div>
207 <div class="padding"></div>
208
209 <div class="entry">
210 <div class="title"><a href="Kerberos_for_Debian_Edu_Squeeze_.html">Kerberos for Debian Edu/Squeeze?</a></div>
211 <div class="date">2010-04-14 17:20</div>
212 <div class="body">
213 <p><a href="http://www.nuug.no/aktiviteter/20100413-kerberos/">Yesterdays
214 NUUG presentation</a> about Kerberos was inspiring, and reminded me
215 about the need to start using Kerberos in Skolelinux. Setting up a
216 Kerberos server seem to be straight forward, and if we get this in
217 place a long time before the Squeeze version of Debian freezes, we
218 have a chance to migrate Skolelinux away from NFSv3 for the home
219 directories, and over to an architecture where the infrastructure do
220 not have to trust IP addresses and machines, and instead can trust
221 users and cryptographic keys instead.</p>
222
223 <p>A challenge will be integration and administration. Is there a
224 Kerberos implementation for Debian where one can control the
225 administration access in Kerberos using LDAP groups? With it, the
226 school administration will have to maintain access control using flat
227 files on the main server, which give a huge potential for errors.</p>
228
229 <p>A related question I would like to know is how well Kerberos and
230 pam-ccreds (offline password check) work together. Anyone know?</p>
231
232 <p>Next step will be to use Kerberos for access control in Lwat and
233 Nagios. I have no idea how much work that will be to implement. We
234 would also need to document how to integrate with Windows AD, as such
235 shared network will require two Kerberos realms that need to cooperate
236 to work properly.</p>
237
238 <p>I believe a good start would be to start using Kerberos on the
239 skolelinux.no machines, and this way get ourselves experience with
240 configuration and integration. A natural starting point would be
241 setting up ldap.skolelinux.no as the Kerberos server, and migrate the
242 rest of the machines from PAM via LDAP to PAM via Kerberos one at the
243 time.</p>
244
245 <p>If you would like to contribute to get this working in Skolelinux,
246 I recommend you to see the video recording from yesterdays NUUG
247 presentation, and start using Kerberos at home. The video show show
248 up in a few days.</p>
249 </div>
250 <div class="tags">
251
252
253
254 Tags: <a href="tags/debian edu">debian edu</a>, <a href="tags/english">english</a>, <a href="tags/nuug">nuug</a>.
255
256 </div>
257 </div>
258 <div class="padding"></div>
259
260 <div class="entry">
261 <div class="title"><a href="P___vegne_av_vanvitting_mange__Aftenposten_.html">På vegne av vanvitting mange, Aftenposten!</a></div>
262 <div class="date">2010-03-06 21:15</div>
263 <div class="body">
264 <p><a href="http://fotball.aftenposten.no/incoming/article163000.ece">Aftenposten
265 melder</a> på forsiden av webavisen sin at de tror Erling Fossen
266 provoserer nordlendinger med sine uttalelser på
267 fotballtinget. Jeg er utflyttet nordlending, og må innrømme at jeg
268 ikke kjennet så mye som et snev av provokasjon fra denne litt morsomme
269 uttalelsen til Hr. Fossen. Lurer på om Aftenposten har noen kilder
270 utenom redaksjonen for sin påstand om at nordledinger er provosert av
271 Hr. Fossen. Må innrømme at jeg tviler på det.</p>
272
273 <p>Det hele bringer tankene tilbake til Sture Hansen i Hallo i Uken.</p>
274 </div>
275 <div class="tags">
276
277
278
279 Tags: <a href="tags/norsk">norsk</a>.
280
281 </div>
282 </div>
283 <div class="padding"></div>
284
285 <div class="entry">
286 <div class="title"><a href="After_6_years_of_waiting__the_Xreset_d_feature_is_implemented.html">After 6 years of waiting, the Xreset.d feature is implemented</a></div>
287 <div class="date">2010-03-06 18:15</div>
288 <div class="body">
289 <p>6 years ago, as part of the Debian Edu development I am involved
290 in, I asked for a hook in the kdm and gdm setup to run scripts as root
291 when the user log out. A bug was submitted against the xfree86-common
292 package in 2004 (<a href="http://bugs.debian.org/230422">#230422</a>),
293 and revisited every time Debian Edu was working on a new release.
294 Today, this finally paid off.</p>
295
296 <p>The framework for this feature was today commited to the git
297 repositry for the xorg package, and the git repository for xdm has
298 been updated to use this framework. Next on my agenda is to make sure
299 kdm and gdm also add code to use this framework.</p>
300
301 <p>In Debian Edu, we want to ability to run commands as root when the
302 user log out, to get rid of runaway processes and do general cleanup
303 after a user. With this framework in place, we finally can do that in
304 a generic way that work with all display managers using this
305 framework. My goal is to get all display managers in Debian use it,
306 similar to how they use the Xsession.d framework today.<p>
307 </div>
308 <div class="tags">
309
310
311
312 Tags: <a href="tags/debian edu">debian edu</a>, <a href="tags/english">english</a>, <a href="tags/nuug">nuug</a>.
313
314 </div>
315 </div>
316 <div class="padding"></div>
317
318 <div class="entry">
319 <div class="title"><a href="Digitale_b__ker_uten_digitale_restriksjonsmekanismer__DRM__b__r_f___mva_fritak.html">Digitale bøker uten digitale restriksjonsmekanismer (DRM) bør få mva-fritak</a></div>
320 <div class="date">2010-03-03 19:00</div>
321 <div class="body">
322 <p>Den norske bokbransjen har
323 <a href="http://www.digi.no/823912/nei-til-moms-paa-e-boker">bedt om at
324 digitale bøker må få mva-fritak</a> slik papirbøker har det, og
325 <a href="http://www.digi.no/836875/moms-paa-alt-digitalt-innhold">finansdepartementet
326 har sagt nei</a>. Det er et interessant spørsmål om digitale bøker
327 bør ha mva-fritak eller ikke, og svaret er ikke så enkelt som et ja
328 eller nei.
329 <a href="http://www.digi.no/836925/norske-e-boker-truet-av-moms">Enkelte
330 medlemmer</a> av bokbransjen truer med å droppe den planlagte
331 lanseringen av norske digitale bøker med digitale restriksjonsmekanismer
332 (DRM) som de har snakket om å gjennomføre nå i vår, og det må de
333 gjerne gjøre for min del.</p>
334
335 <p>Papirbøker har mva-fritak pga. at de fremmer kultur- og
336 kunnskapsspredning. Digitale bøker uten digitale
337 restriksjonsmekanismer (DRM) fremmer kultur- og kunnskapsspredning,
338 mens digitale bøker med DRM hindrer kultur og kunnskapsspredning.
339 Digitale bøker uten DRM bør få mva-fritak da det er salg av bøker på
340 lik linje med salg av papirbøker, mens digitale bøker med DRM ikke bør
341 få det da det er utleie av bøker og ikke salg.</p>
342
343 <p>Jeg foretrekker å kjøpe bøker, og velger dermed å la være å bruke
344 DRM-belastede digitale bøker. Vet ikke helt hva jeg ville være villig
345 til å betale for å leie en bok, men tror ikke det er mange kronene.
346 Heldigvis er det mye bøker tilgjengelig uten slike restriksjoner, og
347 de som vil ha tak i engelske bøker kan laste ned bøker som er
348 tilgjengelig uten bruksbegresninger fra <a href="http://www.archive.org/">The
349 Internet Archive</a>. Der er det pr. i dag 1 889 313 bøker
350 tilgjengelig. De er tilgjengelig i flere formater. Besøk
351 <a href="http://www.archive.org/details/texts">oversikten over tekster
352 der</a> for å se hva de har.
353 </div>
354 <div class="tags">
355
356
357
358 Tags: <a href="tags/norsk">norsk</a>, <a href="tags/nuug">nuug</a>, <a href="tags/opphavsrett">opphavsrett</a>.
359
360 </div>
361 </div>
362 <div class="padding"></div>
363
364 <div class="entry">
365 <div class="title"><a href="Debian_Edu___Skolelinux_based_on_Lenny_released__work_continues.html">Debian Edu / Skolelinux based on Lenny released, work continues</a></div>
366 <div class="date">2010-02-11 17:15</div>
367 <div class="body">
368 <p>On Tuesday, the Debian/Lenny based version of
369 <a href="http://www.skolelinux.org/">Skolelinux</a> was finally
370 shipped. This was a major leap forward for the project, and I am very
371 pleased that we finally got the release wrapped up. Work on the first
372 point release starts imediately, as we plan to get that one out a
373 month after the major release, to include all fixes for bugs we found
374 and fixed too late in the release process to include last Tuesday.</p>
375
376 <p>Perhaps it even is time for some partying?</p>
377
378 <p>After this first point release, my plan is to focus again on the
379 next major release, based on Squeeze. We will try to get as many of
380 the fixes we need into the official Debian packages before the freeze,
381 and have just a few weeks or months to make it happen.</p>
382 </div>
383 <div class="tags">
384
385
386
387 Tags: <a href="tags/debian edu">debian edu</a>, <a href="tags/english">english</a>, <a href="tags/nuug">nuug</a>.
388
389 </div>
390 </div>
391 <div class="padding"></div>
392
393 <div class="entry">
394 <div class="title"><a href="Danmark_g__r_for_ODF_.html">Danmark går for ODF?</a></div>
395 <div class="date">2010-01-29 12:00</div>
396 <div class="body">
397 <p>Ble nettopp gjort oppmerksom på en
398 <a href="http://www.version2.dk/artikel/13690-breaking-odf-vinder-dokumentformat-krigen ">nyhet fra Version2</a>
399 fra Danmark, der det hevdes at Folketinget har vedtatt at ODF skal
400 brukes som dokumentutvekslingsformat i Staten.</p>
401
402 <p>Hyggelig lesning, spesielt hvis det viser seg at de av vedtatt
403 kravlisten for hva som skal aksepteres som referert i kommentarfeltet
404 til artikkelen og
405 <a href="http://www.version2.dk/artikel/13693-er-ooxml-doemt-ude-her-er-kravene-til-en-offentlig-dokumentstandard">en
406 annen artikkel</a> i samme nett-avis. Liker spesielt godt denne:</p>
407
408 <p><blockquote> Det skal demonstreres, at standarden i sin helhed kan
409 implementeres af alle direkte i sin helhed på flere
410 platforme.</blockquote></p>
411
412 <p>Noe slikt burde være et krav også i Norge.</p>
413 </div>
414 <div class="tags">
415
416
417
418 Tags: <a href="tags/norsk">norsk</a>, <a href="tags/nuug">nuug</a>, <a href="tags/standard">standard</a>.
419
420 </div>
421 </div>
422 <div class="padding"></div>
423
424 <div class="entry">
425 <div class="title"><a href="Automatic_Munin_and_Nagios_configuration.html">Automatic Munin and Nagios configuration</a></div>
426 <div class="date">2010-01-27 15:15</div>
427 <div class="body">
428 <p>One of the new features in the next Debian/Lenny based release of
429 Debian Edu/Skolelinux, which is scheduled for release in the next few
430 days, is automatic configuration of the service monitoring system
431 Nagios. The previous release had automatic configuration of trend
432 analysis using Munin, and this Lenny based release take that a step
433 further.</p>
434
435 <p>When installing a Debian Edu Main-server, it is automatically
436 configured as a Munin and Nagios server. In addition, it is
437 configured to be a server for the
438 <a href="http://wiki.debian.org/DebianEdu/HowTo/SiteSummary">SiteSummary
439 system</a> I have written for use in Debian Edu. The SiteSummary
440 system is inspired by a system used by the University of Oslo where I
441 work. In short, the system provide a centralised collector of
442 information about the computers on the network, and a client on each
443 computer submitting information to this collector. This allow for
444 automatic information on which packages are installed on each machine,
445 which kernel the machines are using, what kind of configuration the
446 packages got etc. This also allow us to automatically generate Munin
447 and Nagios configuration.</p>
448
449 <p>All computers reporting to the sitesummary collector with the
450 munin-node package installed is automatically enabled as a Munin
451 client and graphs from the statistics collected from that machine show
452 up automatically on http://www/munin/ on the Main-server.</p>
453
454 <p>All non-laptop computers reporting to the sitesummary collector are
455 automatically monitored for network presence (ping and any network
456 services detected). In addition, all computers (also laptops) with
457 the nagios-nrpe-server package installed and configured the way
458 sitesummary would configure it, are monitored for full disks, software
459 raid status, swap free and other checks that need to run locally on
460 the machine.</p>
461
462 <p>The result is that the administrator on a school using Debian Edu
463 based on Lenny will be able to check the health of his installation
464 with one look at the Nagios settings, without having to spend any time
465 keeping the Nagios configuration up-to-date.</p>
466
467 <p>The only configuration one need to do to get Nagios up and running
468 is to set the password used to get access via HTTP. The system
469 administrator need to run "<tt>htpasswd /etc/nagios3/htpasswd.users
470 nagiosadmin</tt>" to create a nagiosadmin user and set a password for
471 it to be able to log into the Nagios web pages. After that,
472 everything is taken care of.</p>
473 </div>
474 <div class="tags">
475
476
477
478 Tags: <a href="tags/debian edu">debian edu</a>, <a href="tags/english">english</a>, <a href="tags/nuug">nuug</a>.
479
480 </div>
481 </div>
482 <div class="padding"></div>
483
484 <p style="text-align: right;"><a href="index.rss"><img src="xml.gif" alt="RSS feed" width="36" height="14"></a></p>
485
486 <div id="sidebar">
487
488
489
490
491
492 <h2>Archive</h2>
493 <ul>
494
495 <li>2010
496 <ul>
497
498 <li><a href="archive/2010/01/">January (2)</a></li>
499
500 <li><a href="archive/2010/02/">February (1)</a></li>
501
502 <li><a href="archive/2010/03/">March (3)</a></li>
503
504 <li><a href="archive/2010/04/">April (3)</a></li>
505
506 <li><a href="archive/2010/05/">May (1)</a></li>
507
508 </ul></li>
509
510 <li>2009
511 <ul>
512
513 <li><a href="archive/2009/01/">January (8)</a></li>
514
515 <li><a href="archive/2009/02/">February (8)</a></li>
516
517 <li><a href="archive/2009/03/">March (12)</a></li>
518
519 <li><a href="archive/2009/04/">April (10)</a></li>
520
521 <li><a href="archive/2009/05/">May (9)</a></li>
522
523 <li><a href="archive/2009/06/">June (3)</a></li>
524
525 <li><a href="archive/2009/07/">July (4)</a></li>
526
527 <li><a href="archive/2009/08/">August (3)</a></li>
528
529 <li><a href="archive/2009/09/">September (1)</a></li>
530
531 <li><a href="archive/2009/10/">October (2)</a></li>
532
533 <li><a href="archive/2009/11/">November (3)</a></li>
534
535 <li><a href="archive/2009/12/">December (3)</a></li>
536
537 </ul></li>
538
539 <li>2008
540 <ul>
541
542 <li><a href="archive/2008/11/">November (5)</a></li>
543
544 <li><a href="archive/2008/12/">December (7)</a></li>
545
546 </ul></li>
547
548 </ul>
549
550
551
552 <h2>Tags</h2>
553 <ul>
554
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