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   6     <title>Petter Reinholdtsen: entries from April 2010</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <h3>Entries from April 2010.</h3>
  23
  24     <div class="entry">
  25       <div class="title">
  26         <a href="http://people.skolelinux.org/pere/blog/Kerberos_for_Debian_Edu_Squeeze_.html">Kerberos for Debian Edu/Squeeze?</a>
  27       </div>
  28       <div class="date">
  29         14th April 2010
  30       </div>
  31       <div class="body">
  32         <p><a href="http://www.nuug.no/aktiviteter/20100413-kerberos/">Yesterdays
  33 NUUG presentation</a> about Kerberos was inspiring, and reminded me
  34 about the need to start using Kerberos in Skolelinux.  Setting up a
  35 Kerberos server seem to be straight forward, and if we get this in
  36 place a long time before the Squeeze version of Debian freezes, we
  37 have a chance to migrate Skolelinux away from NFSv3 for the home
  38 directories, and over to an architecture where the infrastructure do
  39 not have to trust IP addresses and machines, and instead can trust
  40 users and cryptographic keys instead.</p>
  41
  42 <p>A challenge will be integration and administration.  Is there a
  43 Kerberos implementation for Debian where one can control the
  44 administration access in Kerberos using LDAP groups?  With it, the
  45 school administration will have to maintain access control using flat
  46 files on the main server, which give a huge potential for errors.</p>
  47
  48 <p>A related question I would like to know is how well Kerberos and
  49 pam-ccreds (offline password check) work together.  Anyone know?</p>
  50
  51 <p>Next step will be to use Kerberos for access control in Lwat and
  52 Nagios.  I have no idea how much work that will be to implement.  We
  53 would also need to document how to integrate with Windows AD, as such
  54 shared network will require two Kerberos realms that need to cooperate
  55 to work properly.</p>
  56
  57 <p>I believe a good start would be to start using Kerberos on the
  58 skolelinux.no machines, and this way get ourselves experience with
  59 configuration and integration.  A natural starting point would be
  60 setting up ldap.skolelinux.no as the Kerberos server, and migrate the
  61 rest of the machines from PAM via LDAP to PAM via Kerberos one at the
  62 time.</p>
  63
  64 <p>If you would like to contribute to get this working in Skolelinux,
  65 I recommend you to see the video recording from yesterdays NUUG
  66 presentation, and start using Kerberos at home.  The video show show
  67 up in a few days.</p>
  68
  69       </div>
  70       <div class="tags">
  71
  72
  73         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>.
  74
  75
  76       </div>
  77     </div>
  78     <div class="padding"></div>
  79
  80     <div class="entry">
  81       <div class="title">
  82         <a href="http://people.skolelinux.org/pere/blog/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>
  83       </div>
  84       <div class="date">
  85         19th April 2010
  86       </div>
  87       <div class="body">
  88         <p>The last few weeks i have had the pleasure of reading a
  89 thought-provoking collection of essays by Cory Doctorow, on topics
  90 touching copyright, virtual worlds, the future of man when the
  91 conscience mind can be duplicated into a computer and many more. The
  92 book titled "Content: Selected Essays on Technology, Creativity,
  93 Copyright, and the Future of the Future" is available with few
  94 restrictions on the web, for example from
  95 <a href="http://craphound.com/content/">his own site</a>. I read the
  96 epub-version from
  97 <a href="http://www.feedbooks.com/book/2883">feedbooks</a> using
  98 <a href="http://www.fbreader.org/">fbreader</a> and my N810. I
  99 strongly recommend this book.</p>
 100
 101       </div>
 102       <div class="tags">
 103
 104
 105         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>, <a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett</a>, <a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet</a>, <a href="http://people.skolelinux.org/pere/blog/tags/web">web</a>.
 106
 107
 108       </div>
 109     </div>
 110     <div class="padding"></div>
 111
 112     <div class="entry">
 113       <div class="title">
 114         <a href="http://people.skolelinux.org/pere/blog/Thoughts_on_roaming_laptop_setup_for_Debian_Edu.html">Thoughts on roaming laptop setup for Debian Edu</a>
 115       </div>
 116       <div class="date">
 117         28th April 2010
 118       </div>
 119       <div class="body">
 120         <p>For some years now, I have wondered how we should handle laptops in
 121 Debian Edu.  The Debian Edu infrastructure is mostly designed to
 122 handle stationary computers, and less suited for computers that come
 123 and go.</p>
 124
 125 <p>Now I finally believe I have an sensible idea on how to adjust
 126 Debian Edu for laptops, by introducing a new profile for them, for
 127 example called Roaming Workstations.  Here are my thought on this.
 128 The setup would consist of the following:</p>
 129
 130 <ul>
 131
 132  <li>During installation, the user name of the owner / primary user of
 133    the laptop is requested and a local home directory is set up for
 134    the user, with uid and gid information fetched from the LDAP
 135    server.  This allow the user to work also when offline.  The
 136    central home directory can be available in a subdirectory on
 137    request, for example mounted via CIFS.  It could be mounted
 138    automatically when a user log in while on the Debian Edu network,
 139    and unmounted when the machine is taken away (network down,
 140    hibernate, etc), it can be set up to do automatic mounting on
 141    request (using autofs), or perhaps some GUI button on the desktop
 142    can be used to access it when needed.  Perhaps it is enough to use
 143    the fish protocol in KDE?</li>
 144
 145  <li>Password checking is set up to use LDAP or Kerberos
 146    authentication when the machine is on the Debian Edu network, and
 147    to cache the password for offline checking when the machine unable
 148    to reach the LDAP or Kerberos server.  This can be done using
 149    <a href="http://www.padl.com/OSS/pam_ccreds.html">libpam-ccreds</a>
 150    or the Fedora developed
 151    <a href="https://fedoraproject.org/wiki/Features/SSSD">System
 152    Security Services Daemon</a> packages.</li>
 153
 154  <li>File synchronisation with the central home directory is set up
 155    using a shared directory in both the local and the central home
 156    directory, using unison.</li>
 157
 158  <li>Printing should be set up to print to all printers broadcasting
 159    their existence on the local network, and should then work out of
 160    the box with CUPS.  For sites needing accurate printer quotas, some
 161    system with Kerberos authentication or printing via ssh could be
 162    implemented.</li>
 163
 164  <li>For users that should have local root access to their laptop,
 165    sudo should be used to allow this to the local user.</li>
 166
 167  <li>It would be nice if user and group information from LDAP is
 168    cached on the client, but given that there are entries for the
 169    local user and primary group in /etc/, it should not be needed.</li>
 170
 171 </ul>
 172
 173 <p>I believe all the pieces to implement this are in Debian/testing at
 174 the moment.  If we work quickly, we should be able to get this ready
 175 in time for the Squeeze release to freeze.  Some of the pieces need
 176 tweaking, like libpam-ccreds should get support for pam-auth-update
 177 (<a href="http://bugs.debian.org/566718">#566718</a>) and nslcd (or
 178 perhaps debian-edu-config) should get some integration code to stop
 179 its daemon when the LDAP server is unavailable to avoid long timeouts
 180 when disconnected from the net.  If we get Kerberos enabled, we need
 181 to make sure we avoid long timeouts there too.</p>
 182
 183 <p>If you want to help out with implementing this for Debian Edu,
 184 please contact us on debian-edu@lists.debian.org.</p>
 185
 186       </div>
 187       <div class="tags">
 188
 189
 190         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug</a>.
 191
 192
 193       </div>
 194     </div>
 195     <div class="padding"></div>
 196
 197     <p style="text-align: right;"><a href="04.rss"><img src="http://people.skolelinux.org/pere/blog/xml.gif" alt="RSS Feed" width="36" height="14" /></a></p>
 198     <div id="sidebar">
 199
 200
 201
 202 <h2>Archive</h2>
 203 <ul>
 204
 205 <li>2012
 206 <ul>
 207
 208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 209
 210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 211
 212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 213
 214 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 215
 216 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 217
 218 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 219
 220 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (12)</a></li>
 221
 222 </ul></li>
 223
 224 <li>2011
 225 <ul>
 226
 227 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 228
 229 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 230
 231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 232
 233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 234
 235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 236
 237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 238
 239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 240
 241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 242
 243 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 244
 245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 246
 247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 248
 249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 250
 251 </ul></li>
 252
 253 <li>2010
 254 <ul>
 255
 256 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 257
 258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 259
 260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 261
 262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 263
 264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 267
 268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 269
 270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 271
 272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 273
 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 275
 276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 277
 278 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 279
 280 </ul></li>
 281
 282 <li>2009
 283 <ul>
 284
 285 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 286
 287 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 288
 289 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 290
 291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 292
 293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 296
 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 298
 299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 300
 301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 302
 303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 304
 305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 306
 307 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 308
 309 </ul></li>
 310
 311 <li>2008
 312 <ul>
 313
 314 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 315
 316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 317
 318 </ul></li>
 319
 320 </ul>
 321
 322
 323
 324 <h2>Tags</h2>
 325 <ul>
 326
 327  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (13)</a></li>
 328
 329  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 330
 331  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 332
 333  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (2)</a></li>
 334
 335  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (12)</a></li>
 336
 337  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 338
 339  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (55)</a></li>
 340
 341  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (109)</a></li>
 342
 343  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (9)</a></li>
 344
 345  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 346
 347  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (141)</a></li>
 348
 349  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (17)</a></li>
 350
 351  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
 352
 353  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (6)</a></li>
 354
 355  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (30)</a></li>
 356
 357  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (16)</a></li>
 358
 359  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (8)</a></li>
 360
 361  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (4)</a></li>
 362
 363  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 364
 365  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (22)</a></li>
 366
 367  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (188)</a></li>
 368
 369  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (139)</a></li>
 370
 371  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (4)</a></li>
 372
 373  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 374
 375  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (32)</a></li>
 376
 377  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (48)</a></li>
 378
 379  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (1)</a></li>
 380
 381  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 382
 383  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (2)</a></li>
 384
 385  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (4)</a></li>
 386
 387  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 388
 389  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (4)</a></li>
 390
 391  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 392
 393  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (23)</a></li>
 394
 395  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 396
 397  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (1)</a></li>
 398
 399  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (35)</a></li>
 400
 401  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (1)</a></li>
 402
 403  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (4)</a></li>
 404
 405  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (10)</a></li>
 406
 407  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (6)</a></li>
 408
 409  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (32)</a></li>
 410
 411  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (1)</a></li>
 412
 413  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (25)</a></li>
 414
 415 </ul>
 416
 417
 418     </div>
 419     <p style="text-align: right">
 420  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.4</a>
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