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>2020
 113 <ul>
 114
 115 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/02/">February (2)</a></li>
 116
 117 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/03/">March (2)</a></li>
 118
 119 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/04/">April (2)</a></li>
 120
 121 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/05/">May (3)</a></li>
 122
 123 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/06/">June (2)</a></li>
 124
 125 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/07/">July (1)</a></li>
 126
 127 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/09/">September (1)</a></li>
 128
 129 <li><a href="http://people.skolelinux.org/pere/blog/archive/2020/10/">October (1)</a></li>
 130
 131 </ul></li>
 132
 133 <li>2019
 134 <ul>
 135
 136 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/01/">January (4)</a></li>
 137
 138 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/02/">February (3)</a></li>
 139
 140 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/03/">March (3)</a></li>
 141
 142 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/05/">May (2)</a></li>
 143
 144 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/06/">June (5)</a></li>
 145
 146 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/07/">July (2)</a></li>
 147
 148 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/08/">August (1)</a></li>
 149
 150 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/09/">September (1)</a></li>
 151
 152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/11/">November (1)</a></li>
 153
 154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2019/12/">December (4)</a></li>
 155
 156 </ul></li>
 157
 158 <li>2018
 159 <ul>
 160
 161 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/01/">January (1)</a></li>
 162
 163 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/02/">February (5)</a></li>
 164
 165 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/03/">March (5)</a></li>
 166
 167 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/04/">April (3)</a></li>
 168
 169 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/06/">June (2)</a></li>
 170
 171 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/07/">July (5)</a></li>
 172
 173 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/08/">August (3)</a></li>
 174
 175 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/09/">September (3)</a></li>
 176
 177 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/10/">October (5)</a></li>
 178
 179 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/11/">November (2)</a></li>
 180
 181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2018/12/">December (4)</a></li>
 182
 183 </ul></li>
 184
 185 <li>2017
 186 <ul>
 187
 188 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/01/">January (4)</a></li>
 189
 190 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/02/">February (3)</a></li>
 191
 192 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/03/">March (5)</a></li>
 193
 194 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/04/">April (2)</a></li>
 195
 196 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/06/">June (5)</a></li>
 197
 198 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/07/">July (1)</a></li>
 199
 200 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/08/">August (1)</a></li>
 201
 202 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/09/">September (3)</a></li>
 203
 204 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/10/">October (5)</a></li>
 205
 206 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/11/">November (3)</a></li>
 207
 208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2017/12/">December (4)</a></li>
 209
 210 </ul></li>
 211
 212 <li>2016
 213 <ul>
 214
 215 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
 216
 217 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/02/">February (2)</a></li>
 218
 219 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/03/">March (3)</a></li>
 220
 221 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/04/">April (8)</a></li>
 222
 223 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/05/">May (8)</a></li>
 224
 225 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/06/">June (2)</a></li>
 226
 227 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/07/">July (2)</a></li>
 228
 229 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/08/">August (5)</a></li>
 230
 231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/09/">September (2)</a></li>
 232
 233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/10/">October (3)</a></li>
 234
 235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (8)</a></li>
 236
 237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/12/">December (5)</a></li>
 238
 239 </ul></li>
 240
 241 <li>2015
 242 <ul>
 243
 244 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 245
 246 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
 247
 248 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/03/">March (1)</a></li>
 249
 250 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/04/">April (4)</a></li>
 251
 252 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/05/">May (3)</a></li>
 253
 254 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/06/">June (4)</a></li>
 255
 256 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/07/">July (6)</a></li>
 257
 258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/08/">August (2)</a></li>
 259
 260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 261
 262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/10/">October (9)</a></li>
 263
 264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 267
 268 </ul></li>
 269
 270 <li>2014
 271 <ul>
 272
 273 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 274
 275 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 276
 277 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 278
 279 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 280
 281 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 282
 283 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 284
 285 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 286
 287 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 288
 289 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 290
 291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 292
 293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 296
 297 </ul></li>
 298
 299 <li>2013
 300 <ul>
 301
 302 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 303
 304 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 305
 306 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 307
 308 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 309
 310 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 311
 312 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 313
 314 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 315
 316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 317
 318 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 319
 320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 321
 322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 323
 324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 325
 326 </ul></li>
 327
 328 <li>2012
 329 <ul>
 330
 331 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 332
 333 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 334
 335 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 336
 337 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 338
 339 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 340
 341 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 342
 343 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 344
 345 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 346
 347 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 348
 349 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 350
 351 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 354
 355 </ul></li>
 356
 357 <li>2011
 358 <ul>
 359
 360 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 361
 362 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 363
 364 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 365
 366 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 367
 368 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 369
 370 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 371
 372 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 373
 374 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 375
 376 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 377
 378 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 379
 380 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 381
 382 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 383
 384 </ul></li>
 385
 386 <li>2010
 387 <ul>
 388
 389 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 390
 391 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 392
 393 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 394
 395 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 396
 397 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 398
 399 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 400
 401 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 402
 403 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 404
 405 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 406
 407 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 408
 409 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 410
 411 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 412
 413 </ul></li>
 414
 415 <li>2009
 416 <ul>
 417
 418 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 419
 420 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 421
 422 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 423
 424 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 425
 426 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 427
 428 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 429
 430 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 431
 432 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 433
 434 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 435
 436 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 437
 438 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 439
 440 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 441
 442 </ul></li>
 443
 444 <li>2008
 445 <ul>
 446
 447 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 448
 449 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 450
 451 </ul></li>
 452
 453 </ul>
 454
 455
 456
 457 <h2>Tags</h2>
 458 <ul>
 459
 460  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 461
 462  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 463
 464  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 465
 466  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 467
 468  <li><a href="http://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 469
 470  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (11)</a></li>
 471
 472  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (174)</a></li>
 479
 480  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 481
 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (7)</a></li>
 483
 484  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 485
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 563
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 571
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 579
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 587
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 589
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 591     </div>
 592     <p style="text-align: right">
 593  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 594 </p>
 595
 596   </body>
 597 </html>