blog/Fetching_trusted_timestamps_using_the_rfc3161ng_python_module.html

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  14  <h1>
  15      <a href="https://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="https://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html">2014</a>,
  28 <a href="https://people.skolelinux.org/pere/blog/syslog_trusted_timestamp___chain_of_trusted_timestamps_for_your_syslog.html">2016</a>
  29 and
  30 <a href="https://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="https://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="https://people.skolelinux.org/pere/blog/tags/noark5">noark5</a>, <a href="https://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet</a>.</div>
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 387
 388 <li>2014
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 391 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
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 408
 409 <li><a href="https://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
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 412
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 414
 415 </ul></li>
 416
 417 <li>2013
 418 <ul>
 419
 420 <li><a href="https://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 421
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 443
 444 </ul></li>
 445
 446 <li>2012
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 462
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 472
 473 </ul></li>
 474
 475 <li>2011
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 488 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 489
 490 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 491
 492 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 493
 494 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 495
 496 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 497
 498 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 499
 500 <li><a href="https://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 501
 502 </ul></li>
 503
 504 <li>2010
 505 <ul>
 506
 507 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 508
 509 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 510
 511 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 512
 513 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 514
 515 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 516
 517 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 518
 519 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 520
 521 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 522
 523 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 524
 525 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 526
 527 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 528
 529 <li><a href="https://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 530
 531 </ul></li>
 532
 533 <li>2009
 534 <ul>
 535
 536 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 537
 538 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 539
 540 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 541
 542 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 543
 544 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 545
 546 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 547
 548 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 549
 550 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 551
 552 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 553
 554 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 555
 556 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 557
 558 <li><a href="https://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 559
 560 </ul></li>
 561
 562 <li>2008
 563 <ul>
 564
 565 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 566
 567 <li><a href="https://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 568
 569 </ul></li>
 570
 571 </ul>
 572
 573
 574
 575 <h2>Tags</h2>
 576 <ul>
 577
 578  <li><a href="https://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (19)</a></li>
 579
 580  <li><a href="https://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 581
 582  <li><a href="https://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 583
 584  <li><a href="https://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 585
 586  <li><a href="https://people.skolelinux.org/pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 587
 588  <li><a href="https://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (13)</a></li>
 589
 590  <li><a href="https://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 591
 592  <li><a href="https://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 593
 594  <li><a href="https://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (3)</a></li>
 595
 596  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian">debian (201)</a></li>
 597
 598  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (159)</a></li>
 599
 600  <li><a href="https://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (9)</a></li>
 601
 602  <li><a href="https://people.skolelinux.org/pere/blog/tags/digistan">digistan (11)</a></li>
 603
 604  <li><a href="https://people.skolelinux.org/pere/blog/tags/dld">dld (18)</a></li>
 605
 606  <li><a href="https://people.skolelinux.org/pere/blog/tags/docbook">docbook (33)</a></li>
 607
 608  <li><a href="https://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 609
 610  <li><a href="https://people.skolelinux.org/pere/blog/tags/english">english (463)</a></li>
 611
 612  <li><a href="https://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 613
 614  <li><a href="https://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (14)</a></li>
 615
 616  <li><a href="https://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (34)</a></li>
 617
 618  <li><a href="https://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 619
 620  <li><a href="https://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 621
 622  <li><a href="https://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 623
 624  <li><a href="https://people.skolelinux.org/pere/blog/tags/intervju">intervju (43)</a></li>
 625
 626  <li><a href="https://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (18)</a></li>
 627
 628  <li><a href="https://people.skolelinux.org/pere/blog/tags/kart">kart (23)</a></li>
 629
 630  <li><a href="https://people.skolelinux.org/pere/blog/tags/kodi">kodi (6)</a></li>
 631
 632  <li><a href="https://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 633
 634  <li><a href="https://people.skolelinux.org/pere/blog/tags/lego">lego (5)</a></li>
 635
 636  <li><a href="https://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 637
 638  <li><a href="https://people.skolelinux.org/pere/blog/tags/linuxcnc">linuxcnc (7)</a></li>
 639
 640  <li><a href="https://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 641
 642  <li><a href="https://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 643
 644  <li><a href="https://people.skolelinux.org/pere/blog/tags/madewithcc">madewithcc (3)</a></li>
 645
 646  <li><a href="https://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 647
 648  <li><a href="https://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (46)</a></li>
 649
 650  <li><a href="https://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (15)</a></li>
 651
 652  <li><a href="https://people.skolelinux.org/pere/blog/tags/noark5">noark5 (25)</a></li>
 653
 654  <li><a href="https://people.skolelinux.org/pere/blog/tags/norsk">norsk (325)</a></li>
 655
 656  <li><a href="https://people.skolelinux.org/pere/blog/tags/nuug">nuug (199)</a></li>
 657
 658  <li><a href="https://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (41)</a></li>
 659
 660  <li><a href="https://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 661
 662  <li><a href="https://people.skolelinux.org/pere/blog/tags/opensnitch">opensnitch (4)</a></li>
 663
 664  <li><a href="https://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (76)</a></li>
 665
 666  <li><a href="https://people.skolelinux.org/pere/blog/tags/personvern">personvern (114)</a></li>
 667
 668  <li><a href="https://people.skolelinux.org/pere/blog/tags/raid">raid (4)</a></li>
 669
 670  <li><a href="https://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 671
 672  <li><a href="https://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 673
 674  <li><a href="https://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 675
 676  <li><a href="https://people.skolelinux.org/pere/blog/tags/robot">robot (17)</a></li>
 677
 678  <li><a href="https://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 679
 680  <li><a href="https://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 681
 682  <li><a href="https://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 683
 684  <li><a href="https://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (60)</a></li>
 685
 686  <li><a href="https://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 687
 688  <li><a href="https://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 689
 690  <li><a href="https://people.skolelinux.org/pere/blog/tags/standard">standard (76)</a></li>
 691
 692  <li><a href="https://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 693
 694  <li><a href="https://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (14)</a></li>
 695
 696  <li><a href="https://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (65)</a></li>
 697
 698  <li><a href="https://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (5)</a></li>
 699
 700  <li><a href="https://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 701
 702  <li><a href="https://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 703
 704  <li><a href="https://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (22)</a></li>
 705
 706  <li><a href="https://people.skolelinux.org/pere/blog/tags/video">video (80)</a></li>
 707
 708  <li><a href="https://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 709
 710  <li><a href="https://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 711
 712 </ul>
 713
 714
 715     </div>
 716     <p style="text-align: right">
 717  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 718 </p>
 719
 720   </body>
 721 </html>