blog/Automatic_proxy_configuration_with_Debian_Edu___Skolelinux.html

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   6     <title>Petter Reinholdtsen: Automatic proxy configuration with Debian Edu / Skolelinux</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     <div class="entry">
  23       <div class="title">Automatic proxy configuration with Debian Edu / Skolelinux</div>
  24       <div class="date">13th February 2012</div>
  25       <div class="body"><p>New in the Squeeze version of
  26 <a href="http://www.skolelinux.org/">Debian Edu / Skolelinux</a> is the
  27 ability for clients to automatically configure their proxy settings
  28 based on their environment.  We want all systems on the client to use
  29 the WPAD based proxy definition fetched from <tt>http://wpad/wpad.dat</tt>, to
  30 allow sites to control the proxy setting from a central place and make
  31 sure clients do not have hard coded proxy settings.  The schools can
  32 change the global proxy setting by editing
  33 <tt>tjener:/etc/debian-edu/www/wpad.dat</tt> and the change propagate
  34 to all Debian Edu clients in the network.</p>
  35
  36 <p>The problem is that some systems do not understand the WPAD system.
  37 In other words, how do one get from a WPAD file like this (this is a
  38 simple one, they can run arbitrary code):</p>
  39
  40 <blockquote><pre>
  41 function FindProxyForURL(url, host)
  42 {
  43    if (!isResolvable(host) ||
  44        isPlainHostName(host) ||
  45        dnsDomainIs(host, ".intern"))
  46       return "DIRECT";
  47    else
  48       return "PROXY webcache:3128; DIRECT";
  49 }
  50 </pre></blockquote>
  51
  52 <p>to a proxy setting in the process environment looking like this:</p>
  53
  54 <blockquote><pre>
  55 http_proxy=http://webcache:3128/
  56 ftp_proxy=http://webcache:3128/
  57 </pre></blockquote>
  58
  59 <p>To do this conversion I developed a perl script that will execute
  60 the javascript fragment in the WPAD file and return the proxy that
  61 would be used for
  62 <tt><a href="http://www.debian.org/">http://www.debian.org/</a></tt>,
  63 and insert this extracted proxy URL in <tt>/etc/environment</tt> and
  64 <tt>/etc/apt/apt.conf</tt>.  The perl script wpad-extract work just
  65 fine in Squeeze, but in Wheezy the library it need to run the
  66 javascript code is <a href="http://bugs.debian.org/631045">no longer
  67 able to build</a> because the C library it depended on is now a C++
  68 library.  I hope someone find a solution to that problem before Wheezy
  69 is frozen.  An alternative would be for us to rewrite wpad-extract to
  70 use some other javascript library currently working in Wheezy, but no
  71 known alternative is known at the moment.</p>
  72
  73 <p>This automatic proxy system allow the roaming workstation (aka
  74 laptop) setup in Debian Edu/Squeeze to use the proxy when the laptop
  75 is connected to the backbone network in a Debian Edu setup, and to
  76 automatically use any proxy present and announced using the WPAD
  77 feature when it is connected to other networks.  And if no proxy is
  78 announced, direct connections will be used instead.</p>
  79
  80 <p>Silently using a proxy announced on the network might be a privacy
  81 or security problem.  But those controlling DHCP and DNS on a network
  82 could just as easily set up a transparent proxy, and force all HTTP
  83 and FTP connections to use a proxy anyway, so I consider that
  84 distinction to be academic.  If you are afraid of using the wrong
  85 proxy, you should avoid connecting to the network in question in the
  86 first place.  In Debian Edu, the proxy setup is updated using dhcp and
  87 ifupdown hooks, to make sure the configuration is updated every time
  88 the network setup changes.</p>
  89
  90 <p>The WPAD system is documented in a
  91 <a href="http://tools.ietf.org/html/draft-ietf-wrec-wpad-01">IETF
  92 draft</a> and a
  93 <a href="http://en.wikipedia.org/wiki/Web_Proxy_Autodiscovery_Protocol">Wikipedia
  94 page</a> for those that want to learn more.</p>
  95 </div>
  96
  97       <div class="tags">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>.</div>
  98
  99
 100     </div>
 101
 102
 103
 104
 105     <div id="sidebar">
 106
 107
 108
 109 <h2>Archive</h2>
 110 <ul>
 111
 112 <li>2017
 113 <ul>
 114
 115 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 116
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 134
 135 </ul></li>
 136
 137 <li>2016
 138 <ul>
 139
 140 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 141
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 153
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 155
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 157
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 159
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 161
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 163
 164 </ul></li>
 165
 166 <li>2015
 167 <ul>
 168
 169 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 170
 171 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 172
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 174
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 176
 177 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 178
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 180
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 182
 183 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 184
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 186
 187 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 188
 189 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 190
 191 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 192
 193 </ul></li>
 194
 195 <li>2014
 196 <ul>
 197
 198 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 199
 200 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 201
 202 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 203
 204 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 205
 206 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 207
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 209
 210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 211
 212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 213
 214 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 215
 216 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 217
 218 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 219
 220 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 221
 222 </ul></li>
 223
 224 <li>2013
 225 <ul>
 226
 227 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 228
 229 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 230
 231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 232
 233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 234
 235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 236
 237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 238
 239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 240
 241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 242
 243 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 244
 245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 246
 247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 248
 249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 250
 251 </ul></li>
 252
 253 <li>2012
 254 <ul>
 255
 256 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 257
 258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 259
 260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 261
 262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 263
 264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 267
 268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 269
 270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 271
 272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 273
 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 275
 276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 277
 278 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 279
 280 </ul></li>
 281
 282 <li>2011
 283 <ul>
 284
 285 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 286
 287 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 288
 289 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 290
 291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 292
 293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 296
 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 298
 299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 300
 301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 302
 303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 304
 305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 306
 307 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 308
 309 </ul></li>
 310
 311 <li>2010
 312 <ul>
 313
 314 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 315
 316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 317
 318 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 319
 320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 321
 322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 323
 324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 325
 326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 327
 328 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 329
 330 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 331
 332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 333
 334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 335
 336 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 337
 338 </ul></li>
 339
 340 <li>2009
 341 <ul>
 342
 343 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 344
 345 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 346
 347 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 348
 349 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 350
 351 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 354
 355 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 356
 357 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 358
 359 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 360
 361 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 362
 363 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 364
 365 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 366
 367 </ul></li>
 368
 369 <li>2008
 370 <ul>
 371
 372 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 373
 374 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 375
 376 </ul></li>
 377
 378 </ul>
 379
 380
 381
 382 <h2>Tags</h2>
 383 <ul>
 384
 385  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (14)</a></li>
 386
 387  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 388
 389  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 390
 391  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 392
 393  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (9)</a></li>
 394
 395  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (16)</a></li>
 396
 397  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 398
 399  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 400
 401  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (154)</a></li>
 402
 403  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 404
 405  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 406
 407  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 408
 409  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
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 411  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (24)</a></li>
 412
 413  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 414
 415  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (359)</a></li>
 416
 417  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 418
 419  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
 420
 421  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (30)</a></li>
 422
 423  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 424
 425  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (18)</a></li>
 426
 427  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 428
 429  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 430
 431  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (15)</a></li>
 432
 433  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
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 435  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 436
 437  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 438
 439  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 440
 441  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 442
 443  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 444
 445  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 446
 447  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (39)</a></li>
 448
 449  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (9)</a></li>
 450
 451  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (293)</a></li>
 452
 453  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (189)</a></li>
 454
 455  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (33)</a></li>
 456
 457  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 458
 459  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (66)</a></li>
 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (104)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 464
 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (5)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (53)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (55)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (52)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (59)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (40)</a></li>
 504
 505 </ul>
 506
 507
 508     </div>
 509     <p style="text-align: right">
 510  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 511 </p>
 512
 513   </body>
 514 </html>