blog/Fetching_trusted_timestamps_using_the_rfc3161ng_python_module.html

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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">Fetching trusted timestamps using the rfc3161ng python module</div>
  24       <div class="date"> 8th October 2018</div>
  25       <div class="body"><p>I have  earlier covered the basics of trusted timestamping using the
  26 'openssl ts' client.  See blog post for
  27 <a href="http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html">2014</a>,
  28 <a href="http://people.skolelinux.org/pere/blog/syslog_trusted_timestamp___chain_of_trusted_timestamps_for_your_syslog.html">2016</a>
  29 and
  30 <a href="http://people.skolelinux.org/pere/blog/Idea_for_storing_trusted_timestamps_in_a_Noark_5_archive.html">2017</a>
  31 for those stories.  But some times I want to integrate the timestamping
  32 in other code, and recently I needed to integrate it into Python.
  33 After searching a bit, I found
  34 <a href="https://dev.entrouvert.org/projects/python-rfc3161">the
  35 rfc3161 library</a> which seemed like a good fit, but I soon
  36 discovered it only worked for python version 2, and I needed something
  37 that work with python version 3.  Luckily I next came across
  38 <a href="https://github.com/trbs/rfc3161ng/">the rfc3161ng library</a>,
  39 a fork of the original rfc3161 library.  Not only is it working with
  40 python 3, it have fixed a few of the bugs in the original library, and
  41 it has an active maintainer.  I decided to wrap it up and make it
  42 <a href="https://tracker.debian.org/pkg/python-rfc3161ng">available in
  43 Debian</a>, and a few days ago it entered Debian unstable and testing.</p>
  44
  45 <p>Using the library is fairly straight forward.  The only slightly
  46 problematic step is to fetch the required certificates to verify the
  47 timestamp.  For some services it is straight forward, while for others
  48 I have not yet figured out how to do it.  Here is a small standalone
  49 code example based on of the integration tests in the library code:</p>
  50
  51 <pre>
  52 #!/usr/bin/python3
  53
  54 """
  55
  56 Python 3 script demonstrating how to use the rfc3161ng module to
  57 get trusted timestamps.
  58
  59 The license of this code is the same as the license of the rfc3161ng
  60 library, ie MIT/BSD.
  61
  62 """
  63
  64 import os
  65 import pyasn1.codec.der
  66 import rfc3161ng
  67 import subprocess
  68 import tempfile
  69 import urllib.request
  70
  71 def store(f, data):
  72     f.write(data)
  73     f.flush()
  74     f.seek(0)
  75
  76 def fetch(url, f=None):
  77     response = urllib.request.urlopen(url)
  78     data = response.read()
  79     if f:
  80         store(f, data)
  81     return data
  82
  83 def main():
  84     with tempfile.NamedTemporaryFile() as cert_f,\
  85          tempfile.NamedTemporaryFile() as ca_f,\
  86          tempfile.NamedTemporaryFile() as msg_f,\
  87          tempfile.NamedTemporaryFile() as tsr_f:
  88
  89         # First fetch certificates used by service
  90         certificate_data = fetch('https://freetsa.org/files/tsa.crt', cert_f)
  91         ca_data_data = fetch('https://freetsa.org/files/cacert.pem', ca_f)
  92
  93         # Then timestamp the message
  94         timestamper = \
  95             rfc3161ng.RemoteTimestamper('http://freetsa.org/tsr',
  96                                         certificate=certificate_data)
  97         data = b"Python forever!\n"
  98         tsr = timestamper(data=data, return_tsr=True)
  99
 100         # Finally, convert message and response to something 'openssl ts' can verify
 101         store(msg_f, data)
 102         store(tsr_f, pyasn1.codec.der.encoder.encode(tsr))
 103         args = ["openssl", "ts", "-verify",
 104                 "-data", msg_f.name,
 105                 "-in", tsr_f.name,
 106                 "-CAfile", ca_f.name,
 107                 "-untrusted", cert_f.name]
 108         subprocess.check_call(args)
 109
 110 if '__main__' == __name__:
 111    main()
 112 </pre>
 113
 114 <p>The code fetches the required certificates, store them as temporary
 115 files, timestamp a simple message, store the message and timestamp to
 116 disk and ask 'openssl ts' to verify the timestamp.  A timestamp is
 117 around 1.5 kiB in size, and should be fairly easy to store for future
 118 use.</p>
 119
 120 <p>As usual, if you use Bitcoin and want to show your support of my
 121 activities, please send Bitcoin donations to my address
 122 <b><a href="bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b</a></b>.</p>
 123 </div>
 124
 125       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/noark5">noark5</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet</a>.</div>
 126
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 320
 321 <li>2013
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 347
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 349
 350 <li>2012
 351 <ul>
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 376
 377 </ul></li>
 378
 379 <li>2011
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 401
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 403
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 405
 406 </ul></li>
 407
 408 <li>2010
 409 <ul>
 410
 411 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 412
 413 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 414
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 416
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 418
 419 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
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 421 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 422
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 424
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 426
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 428
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 430
 431 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 432
 433 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 434
 435 </ul></li>
 436
 437 <li>2009
 438 <ul>
 439
 440 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 441
 442 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
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 455
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 457
 458 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 459
 460 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 461
 462 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 463
 464 </ul></li>
 465
 466 <li>2008
 467 <ul>
 468
 469 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 470
 471 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 472
 473 </ul></li>
 474
 475 </ul>
 476
 477
 478
 479 <h2>Tags</h2>
 480 <ul>
 481
 482  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 483
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 487
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 489
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 491
 492  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (11)</a></li>
 493
 494  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 495
 496  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 497
 498  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
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 502  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 503
 504  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 505
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 507
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 509
 510  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (26)</a></li>
 511
 512  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 513
 514  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (418)</a></li>
 515
 516  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 517
 518  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 519
 520  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 521
 522  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 523
 524  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 525
 526  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 527
 528  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 529
 530  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 531
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 535
 536  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 537
 538  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
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 541
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 543
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 545
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 548  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 549
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 559
 560  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 561
 562  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (75)</a></li>
 563
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 565
 566  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 567
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 569
 570  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 571
 572  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 573
 574  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (12)</a></li>
 575
 576  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 577
 578  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 579
 580  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 581
 582  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (58)</a></li>
 583
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 585
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 588  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (70)</a></li>
 589
 590  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 591
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 593
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 596  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 597
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 601
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 606  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 607
 608  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 609
 610 </ul>
 611
 612
 613     </div>
 614     <p style="text-align: right">
 615  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 616 </p>
 617
 618   </body>
 619 </html>