blog/archive/2014/11/index.html

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   6     <title>Petter Reinholdtsen: entries from November 2014</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 November 2014.</h3>
  23
  24     <div class="entry">
  25       <div class="title">
  26         <a href="http://people.skolelinux.org/pere/blog/A_Debian_package_for_SMTP_via_Tor__aka_SMTorP__using_exim4.html">A Debian package for SMTP via Tor (aka SMTorP) using exim4</a>
  27       </div>
  28       <div class="date">
  29         10th November 2014
  30       </div>
  31       <div class="body">
  32         <p>The right to communicate with your friends and family in private,
  33 without anyone snooping, is a right every citicen have in a liberal
  34 democracy.  But this right is under serious attack these days.</p>
  35
  36 <p>A while back it occurred to me that one way to make the dragnet
  37 surveillance conducted by NSA, GCHQ, FRA and others (and confirmed by
  38 the whisleblower Snowden) more expensive for Internet email,
  39 is to deliver all email using SMTP via Tor.  Such SMTP option would be
  40 a nice addition to the FreedomBox project if we could send email
  41 between FreedomBox machines without leaking metadata about the emails
  42 to the people peeking on the wire.  I
  43 <a href="http://lists.alioth.debian.org/pipermail/freedombox-discuss/2014-October/006493.html">proposed
  44 this on the FreedomBox project mailing list in October</a> and got a
  45 lot of useful feedback and suggestions.  It also became obvious to me
  46 that this was not a novel idea, as the same idea was tested and
  47 documented by Johannes Berg as early as 2006, and both
  48 <a href="https://github.com/pagekite/Mailpile/wiki/SMTorP">the
  49 Mailpile</a> and <a href="http://dee.su/cables">the Cables</a> systems
  50 propose a similar method / protocol to pass emails between users.</p>
  51
  52 <p>To implement such system one need to set up a Tor hidden service
  53 providing the SMTP protocol on port 25, and use email addresses
  54 looking like username@hidden-service-name.onion.  With such addresses
  55 the connections to port 25 on hidden-service-name.onion using Tor will
  56 go to the correct SMTP server.  To do this, one need to configure the
  57 Tor daemon to provide the hidden service and the mail server to accept
  58 emails for this .onion domain.  To learn more about Exim configuration
  59 in Debian and test the design provided by Johannes Berg in his FAQ, I
  60 set out yesterday to create a Debian package for making it trivial to
  61 set up such SMTP over Tor service based on Debian.  Getting it to work
  62 were fairly easy, and
  63 <a href="https://github.com/petterreinholdtsen/exim4-smtorp">the
  64 source code for the Debian package</a> is available from github.  I
  65 plan to move it into Debian if further testing prove this to be a
  66 useful approach.</p>
  67
  68 <p>If you want to test this, set up a blank Debian machine without any
  69 mail system installed (or run <tt>apt-get purge exim4-config</tt> to
  70 get rid of exim4).  Install tor, clone the git repository mentioned
  71 above, build the deb and install it on the machine.  Next, run
  72 <tt>/usr/lib/exim4-smtorp/setup-exim-hidden-service</tt> and follow
  73 the instructions to get the service up and running.  Restart tor and
  74 exim when it is done, and test mail delivery using swaks like
  75 this:</p>
  76
  77 <p><blockquote><pre>
  78 torsocks swaks --server dutlqrrmjhtfa3vp.onion \
  79   --to fbx@dutlqrrmjhtfa3vp.onion
  80 </pre></blockquote></p>
  81
  82 <p>This will test the SMTP delivery using tor.  Replace the email
  83 address with your own address to test your server. :)</p>
  84
  85 <p>The setup procedure is still to complex, and I hope it can be made
  86 easier and more automatic.  Especially the tor setup need more work.
  87 Also, the package include a tor-smtp tool written in C, but its task
  88 should probably be rewritten in some script language to make the deb
  89 architecture independent.  It would probably also make the code easier
  90 to review.  The tor-smtp tool currently need to listen on a socket for
  91 exim to talk to it and is started using xinetd.  It would be better if
  92 no daemon and no socket is needed.  I suspect it is possible to get
  93 exim to run a command line tool for delivery instead of talking to a
  94 socket, and hope to figure out how in a future version of this
  95 system.</p>
  96
  97 <p>Until I wipe my test machine, I can be reached using the
  98 <tt>fbx@dutlqrrmjhtfa3vp.onion</tt> mail address, deliverable over
  99 SMTorP. :)</p>
 100
 101       </div>
 102       <div class="tags">
 103
 104
 105         Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox</a>, <a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern</a>, <a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance</a>.
 106
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 110     <div class="padding"></div>
 111
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 113     <div id="sidebar">
 114
 115
 116
 117 <h2>Archive</h2>
 118 <ul>
 119
 120 <li>2014
 121 <ul>
 122
 123 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 124
 125 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 126
 127 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/03/">March (8)</a></li>
 128
 129 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/04/">April (7)</a></li>
 130
 131 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 132
 133 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/06/">June (2)</a></li>
 134
 135 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 136
 137 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 138
 139 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 140
 141 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 142
 143 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (1)</a></li>
 144
 145 </ul></li>
 146
 147 <li>2013
 148 <ul>
 149
 150 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 151
 152 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 153
 154 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 155
 156 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 157
 158 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 159
 160 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/06/">June (10)</a></li>
 161
 162 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/07/">July (7)</a></li>
 163
 164 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/08/">August (3)</a></li>
 165
 166 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 167
 168 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 169
 170 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 171
 172 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 173
 174 </ul></li>
 175
 176 <li>2012
 177 <ul>
 178
 179 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 180
 181 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 182
 183 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 184
 185 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 186
 187 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 188
 189 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 190
 191 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 192
 193 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 194
 195 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 196
 197 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 198
 199 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 200
 201 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 202
 203 </ul></li>
 204
 205 <li>2011
 206 <ul>
 207
 208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 209
 210 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 211
 212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 213
 214 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 215
 216 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 217
 218 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 219
 220 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 221
 222 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 223
 224 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 225
 226 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 227
 228 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 229
 230 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 231
 232 </ul></li>
 233
 234 <li>2010
 235 <ul>
 236
 237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 238
 239 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 240
 241 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 242
 243 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 244
 245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 246
 247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 248
 249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 250
 251 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 252
 253 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 254
 255 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 256
 257 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 258
 259 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 260
 261 </ul></li>
 262
 263 <li>2009
 264 <ul>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 267
 268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 269
 270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 271
 272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 273
 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 275
 276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 277
 278 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 279
 280 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 281
 282 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 283
 284 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 285
 286 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 287
 288 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 289
 290 </ul></li>
 291
 292 <li>2008
 293 <ul>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 296
 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 298
 299 </ul></li>
 300
 301 </ul>
 302
 303
 304
 305 <h2>Tags</h2>
 306 <ul>
 307
 308  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (13)</a></li>
 309
 310  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 311
 312  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 313
 314  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 315
 316  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (8)</a></li>
 317
 318  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (14)</a></li>
 319
 320  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 321
 322  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 323
 324  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (108)</a></li>
 325
 326  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (151)</a></li>
 327
 328  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 329
 330  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (15)</a></li>
 331
 332  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (12)</a></li>
 333
 334  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 335
 336  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (262)</a></li>
 337
 338  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (21)</a></li>
 339
 340  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
 341
 342  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (13)</a></li>
 343
 344  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 345
 346  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (11)</a></li>
 347
 348  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (41)</a></li>
 349
 350  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (10)</a></li>
 351
 352  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (19)</a></li>
 353
 354  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 355
 356  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 357
 358  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 359
 360  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 361
 362  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 363
 364  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (31)</a></li>
 365
 366  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (248)</a></li>
 367
 368  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (163)</a></li>
 369
 370  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (11)</a></li>
 371
 372  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 373
 374  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (48)</a></li>
 375
 376  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (76)</a></li>
 377
 378  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (1)</a></li>
 379
 380  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 381
 382  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 383
 384  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 385
 386  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (9)</a></li>
 387
 388  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 389
 390  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (4)</a></li>
 391
 392  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 393
 394  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (41)</a></li>
 395
 396  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 397
 398  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (4)</a></li>
 399
 400  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (45)</a></li>
 401
 402  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (3)</a></li>
 403
 404  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (9)</a></li>
 405
 406  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (27)</a></li>
 407
 408  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (2)</a></li>
 409
 410  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (8)</a></li>
 411
 412  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (44)</a></li>
 413
 414  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 415
 416  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (33)</a></li>
 417
 418 </ul>
 419
 420
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