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6 <title>Petter Reinholdtsen
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14 <a href=
"http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen
</a>
23 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Non_blocking_bittorrent_plugin_for_vlc.html">Non-blocking bittorrent plugin for vlc
</a></div>
24 <div class=
"date">12th December
2018</div>
25 <div class=
"body"><p>A few hours ago, a new and improved version (
2.4) of
26 <a href=
"https://tracker.debian.org/pkg/vlc-plugin-bittorrent">the VLC
27 bittorrent plugin
</a> was uploaded to Debian. This new version
28 include a complete rewrite of the bittorrent related code, which seem
29 to make the plugin non-blocking. This mean you can actually exit VLC
30 even when the plugin seem to be unable to get the bittorrent streaming
31 started. The new version also include support for filtering playlist
32 by file extension using command line options, if you want to avoid
33 processing audio, video or images. The package is currently in Debian
34 unstable, but should be available in Debian testing in two days. To
35 test it, simply install it like this:
</p>
38 apt install vlc-plugin-bittorrent
41 <p>After it is installed, you can try to use it to play a file
42 downloaded live via bittorrent like this:
45 vlc https://archive.org/download/Glass_201703/Glass_201703_archive.torrent
48 <p>As usual, if you use Bitcoin and want to show your support of my
49 activities, please send Bitcoin donations to my address
50 <b><a href=
"bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b
</a></b>.
</p>
55 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/video">video
</a>.
60 <div class=
"padding"></div>
63 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Retten_til_kontant_betaling_er_en_rettighet_som_m__brukes_for___beholdes.html">Retten til kontant betaling er en rettighet som må brukes for å beholdes
</a></div>
64 <div class=
"date">11th December
2018</div>
65 <div class=
"body"><p><a href=
"https://www.fn.no/Om-FN/Avtaler/Menneskerettigheter/FNs-verdenserklaering-om-menneskerettigheter">FNs
66 menneskerettighetserklæring
</a> artikkel
13 første punkt lyder som
70 Enhver har rett til å bevege seg fritt og til fritt å velge
71 oppholdssted innenfor en stats grenser.
74 <p>Det er altså en menneskerett å kunne bevege seg fritt i landet.
75 For å bevege seg fritt i landet, så må en kunne bevege seg uten å bli
76 sporet. Det vil i dagens samfunn innebære å bevege seg uten å legge
77 igjen digitale spor og uten å være radiomerket. Hvis en vet at ens
78 bevegelser, hvor en befinner seg når, og hvem som befinner seg i
79 nærheten, blir samlet inn og gjort tilgjengelig for fremmede, det være
80 seg myndighetene eller private organisasjoner, så kan en ikke lenger
81 bevege seg fritt. Dette gjør at det er en forutsetning for å ha glede
82 av retten til å bevege seg fritt i landet at en motstår fristelsen til
83 å legge igjen digitale spor når en betaler for seg. Rettigheter som
84 ikke blir brukt, blir fjernet. Den eneste måten i dag å unngå å legge
85 igjen digitale spor når en betaler for seg, er å betale med kontanter,
86 samt takke nei til å legge igjen navn og adresse (slik f.eks. Elkjøp
87 ber om
— jeg sier de kan legge inn «anonym anonym» når
88 datasystemet deres trenger et navn). Personlig anbefaler jeg å
89 konsekvent bruke kontant betaling når man beveger seg rundt, for å
90 bidra til forsvaret av menneskerettighetene i Norge. Kanskje noe også
91 for deg? Merk at det ikke er tilstrekkelig for å unngå sporing å
92 betale med kontanter, men det er et lite steg i riktig retning.
</p>
94 <p>Det er flere andre argumenter i tillegg til
95 menneskerettighetsargumentet for å bruke kontanter. I går hadde
96 Dagbladet en utmerket kommentar av sin journalist John Olav Egeland om
98 <a href=
"https://www.dagbladet.no/kultur/kontantlost-diktatur/70543434">kontantløst
99 diktatur
</a> som venter oss hvis mange nok slutter å insistere på å
100 betale med kontanter. Jeg anbefaler deg å lese den.
</p>
102 <p>Som vanlig, hvis du bruker Bitcoin og ønsker å vise din støtte til
103 det jeg driver med, setter jeg pris på om du sender Bitcoin-donasjoner
105 <b><a href=
"bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b
</a></b>.
106 Merk, betaling med bitcoin er ikke anonymt. :)
</p>
111 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/norsk">norsk
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/personvern">personvern
</a>.
116 <div class=
"padding"></div>
119 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Why_is_your_site_not_using_Content_Security_Policy___CSP_.html">Why is your site not using Content Security Policy / CSP?
</a></div>
120 <div class=
"date"> 9th December
2018</div>
121 <div class=
"body"><p>Yesterday, I had the pleasure of watching on Frikanalen the OWASP
122 talk by Scott Helme titled
123 "
<a href=
"https://frikanalen.no/video/626080/">What We’ve Learned From
124 Billions of Security Reports
</a>". I had not heard of the
125 <a href="https://en.wikipedia.org/wiki/Content_Security_Policy
">Content
126 Security Policy standard</a> nor its ability to "call home" when a
127 browser detect a policy breach (I do not follow web page design
128 development much these days), and found the talk very illuminating.
</p>
130 <p>The mechanism allow a web site owner to use HTTP headers to tell
131 visitors web browser which sources (internal and external) are allowed to
132 be used on the web site. Thus it become possible to enforce a "only
133 local content" policy despite web designers urge to fetch programs
134 from random sites on the Internet, like the one
135 <a href=
"https://securityaffairs.co/wordpress/68966/hacking/browsealoud-plugin-hack.html">enabling
136 the attack
</a> reported by Scott Helme earlier this year.
</p>
138 <p>Using CSP seem like an obvious thing for a site admin to implement
139 to take some control over the information leak that occur when
140 external sources are used to render web pages, it is a mystery more
141 sites are not using CSP? It is being
142 <a href=
"https://www.w3.org/TR/CSP/">standardized under W3C
</a> these
143 days, and is supposed by most web browsers
</p>
145 <p>I managed to find
<a href=
"https://github.com/mozilla/django-csp">a
146 Django middleware for implementing CSP
</a> and was happy to discover
147 it was already in Debian. I plan to use it to add CSP support to the
148 Frikanalen web site soon.
</p>
150 <p>As usual, if you use Bitcoin and want to show your support of my
151 activities, please send Bitcoin donations to my address
152 <b><a href=
"bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b
</a></b>.
</p>
157 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/standard">standard
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/web">web
</a>.
162 <div class=
"padding"></div>
165 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/New_and_improved_Frikanalen_Kodi_addon_version_0_0_3.html">New and improved Frikanalen Kodi addon version
0.0.3</a></div>
166 <div class=
"date"> 8th November
2018</div>
167 <div class=
"body"><p>If you read my blog regularly, you probably know I am involved in
168 running and developing the
<a href=
"https://frikanalen.no/">Norwegian
169 TV channel Frikanalen
</a>. It is an open channel, allowing everyone
170 in Norway to publish videos on a TV channel with national coverage.
171 You can think of it as Youtube for national television.
172 In addition to distribution on RiksTV and Uninett, Frikanalen is also
173 available as a Kodi addon. The last few days I have updated the code
174 to add more features. A
175 <a href=
"https://kodi.tv/addon/plugins-video-add-ons/frikanalen-nett-tv">new
176 and improved version
0.0.3 Frikanalen addon
</a> was just made
177 available via the Kodi repositories. This new version include a
178 option to browse videos by category, as well as free text search
179 in the video archive. It will now also show the video duration in the
180 video lists, which were missing earlier. A new and experimental
181 link to the HD video stream currently being worked on is provided, for
182 those that want to see what the
<a href=
"https://casparcg.com/">CasparCG
</a>
183 output look like. The alternative is the SD video stream, generated
184 using MLT. CasparCG is controlled by our
185 <a href=
"https://github.com/Frikanalen/mltplayout/">mltplayout
186 server
</a> which instead of talking to mlt is giving PLAY instructions
187 to the CasparCG server when it is time to start a new program.
</p>
189 <p>By now, you are probably wondering what kind of content is being
190 played on the channel. These days, it is filled with technical
191 presentations like those from
<a href=
"https://www.nuug.no/">NUUG
</a>,
192 <a href=
"https://www.debconf.org/">Debconf
</a>, Makercon, and TED,
193 but there are also some periods with
194 <a href=
"https://www.empo.no/">EMPT TV
</a> and
195 <a href=
"https://www.p7.no/">P7
</a>.
197 <p>As usual, if you use Bitcoin and want to show your support of my
198 activities, please send Bitcoin donations to my address
199 <b><a href=
"bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b
</a></b>.
</p>
204 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/kodi">kodi
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/video">video
</a>.
209 <div class=
"padding"></div>
212 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Time_for_an_official_MIME_type_for_patches_.html">Time for an official MIME type for patches?
</a></div>
213 <div class=
"date"> 1st November
2018</div>
214 <div class=
"body"><p>As part of my involvement in
215 <a href=
"https://gitlab.com/OsloMet-ABI/nikita-noark5-core">the Nikita
216 archive API project
</a>, I've been importing a fairly large lump of
217 emails into a test instance of the archive to see how well this would
218 go. I picked a subset of
<a href=
"https://notmuchmail.org/">my
219 notmuch email database
</a>, all public emails sent to me via
220 @lists.debian.org, giving me a set of around
216 000 emails to import.
221 In the process, I had a look at the various attachments included in
222 these emails, to figure out what to do with attachments, and noticed
223 that one of the most common attachment formats do not have
224 <a href=
"https://www.iana.org/assignments/media-types/media-types.xhtml">an
225 official MIME type
</a> registered with IANA/IETF. The output from
226 diff, ie the input for patch, is on the top
10 list of formats
227 included in these emails. At the moment people seem to use either
228 text/x-patch or text/x-diff, but neither is officially registered. It
229 would be better if one official MIME type were registered and used
232 <p>To try to get one official MIME type for these files, I've brought
234 <a href=
"https://www.ietf.org/mailman/listinfo/media-types">the
235 media-types mailing list
</a>. If you are interested in discussion
236 which MIME type to use as the official for patch files, or involved in
237 making software using a MIME type for patches, perhaps you would like
238 to join the discussion?
</p>
240 <p>As usual, if you use Bitcoin and want to show your support of my
241 activities, please send Bitcoin donations to my address
242 <b><a href=
"bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b
</a></b>.
</p>
247 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/standard">standard
</a>.
252 <div class=
"padding"></div>
255 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Measuring_the_speaker_frequency_response_using_the_AUDMES_free_software_GUI___nice_free_software.html">Measuring the speaker frequency response using the AUDMES free software GUI - nice free software
</a></div>
256 <div class=
"date">22nd October
2018</div>
257 <div class=
"body"><p><img src=
"http://people.skolelinux.org/pere/blog/images/2018-10-22-audmes-measure-speakers.png" align=
"right" width=
"40%"/></p>
259 <p>My current home stereo is a patchwork of various pieces I got on
260 flee markeds over the years. It is amazing what kind of equipment
261 show up there. I've been wondering for a while if it was possible to
262 measure how well this equipment is working together, and decided to
263 see how far I could get using free software. After trawling the web I
264 came across an article from DIY Audio and Video on
265 <a href=
"https://www.diyaudioandvideo.com/Tutorial/SpeakerResponseTesting/">Speaker
266 Testing and Analysis
</a> describing how to test speakers, and it listing
267 several software options, among them
268 <a href=
"https://sourceforge.net/projects/audmes/">AUDio MEasurement
269 System (AUDMES)
</a>. It is the only free software system I could find
270 focusing on measuring speakers and audio frequency response. In the
271 process I also found an interesting article from NOVO on
272 <a href=
"http://novo.press/understanding-speaker-specifications-and-frequency-response/">Understanding
273 Speaker Specifications and Frequency Response
</a> and an article from
275 <a href=
"https://www.ecoustics.com/articles/understanding-speaker-frequency-response/">Understanding
276 Speaker Frequency Response
</a>, with a lot of information on what to
277 look for and how to interpret the graphs. Armed with this knowledge,
278 I set out to measure the state of my speakers.
</p>
280 <p>The first hurdle was that AUDMES hadn't seen a commit for
10 years
281 and did not build with current compilers and libraries. I got in
282 touch with its author, who no longer was spending time on the program
283 but gave me write access to the subversion repository on Sourceforge.
284 The end result is that now the code build on Linux and is capable of
285 saving and loading the collected frequency response data in CSV
286 format. The application is quite nice and flexible, and I was able to
287 select the input and output audio interfaces independently. This made
288 it possible to use a USB mixer as the input source, while sending
289 output via my laptop headphone connection. I lacked the hardware and
290 cabling to figure out a different way to get independent cabling to
291 speakers and microphone.
</p>
293 <p>Using this setup I could see how a large range of high frequencies
294 apparently were not making it out of my speakers. The picture show
295 the frequency response measurement of one of the speakers. Note the
296 frequency lines seem to be slightly misaligned, compared to the CSV
297 output from the program. I can not hear several of these are high
298 frequencies, according to measurement from
299 <a href=
"http://freehearingtestsoftware.com">Free Hearing Test
300 Software
</a>, an freeware system to measure your hearing (still
301 looking for a free software alternative), so I do not know if they are
302 coming out out the speakers. I thus do not quite know how to figure
303 out if the missing frequencies is a problem with the microphone, the
304 amplifier or the speakers, but I managed to rule out the audio card in my
305 PC by measuring my Bose noise canceling headset using its own
306 microphone. This setup was able to see the high frequency tones, so
307 the problem with my stereo had to be in the amplifier or speakers.
</p>
309 <p>Anyway, to try to role out one factor I ended up picking up a new
310 set of speakers at a flee marked, and these work a lot better than the
311 old speakers, so I guess the microphone and amplifier is OK. If you
312 need to measure your own speakers, check out AUDMES. If more people
313 get involved, perhaps the project could become good enough to
314 <a href=
"https://bugs.debian.org/910876">include in Debian
</a>? And if
315 you know of some other free software to measure speakers and amplifier
316 performance, please let me know. I am aware of the freeware option
317 <a href=
"https://www.roomeqwizard.com/">REW
</a>, but I want something
318 that can be developed also when the vendor looses interest.
</p>
320 <p>As usual, if you use Bitcoin and want to show your support of my
321 activities, please send Bitcoin donations to my address
322 <b><a href=
"bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b
</a></b>.
</p>
327 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software
</a>.
332 <div class=
"padding"></div>
335 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Web_browser_integration_of_VLC_with_Bittorrent_support.html">Web browser integration of VLC with Bittorrent support
</a></div>
336 <div class=
"date">21st October
2018</div>
337 <div class=
"body"><p>Bittorrent is as far as I know, currently the most efficient way to
338 distribute content on the Internet. It is used all by all sorts of
339 content providers, from national TV stations like
340 <a href=
"https://www.nrk.no/">NRK
</a>, Linux distributors like
341 <a href=
"https://www.debian.org/">Debian
</a> and
342 <a href=
"https://www.ubuntu.com/">Ubuntu
</a>, and of course the
343 <a href=
"https://archive.org/">Internet archive
</A>.
345 <p>Almost a month ago
346 <a href=
"https://tracker.debian.org/pkg/vlc-plugin-bittorrent">a new
347 package adding Bittorrent support to VLC
</a> became available in
348 Debian testing and unstable. To test it, simply install it like
352 apt install vlc-plugin-bittorrent
355 <p>Since the plugin was made available for the first time in Debian,
356 several improvements have been made to it. In version
2.2-
4, now
357 available in both testing and unstable, a desktop file is provided to
358 teach browsers to start VLC when the user click on torrent files or
359 magnet links. The last part is thanks to me finally understanding
360 what the strange x-scheme-handler style MIME types in desktop files
361 are used for. By adding x-scheme-handler/magnet to the MimeType entry
362 in the desktop file, at least the browsers Firefox and Chromium will
363 suggest to start VLC when selecting a magnet URI on a web page. The
364 end result is that now, with the plugin installed in Buster and Sid,
366 <a href=
"https://archive.org/details/CopyingIsNotTheft1080p">Internet
367 Archive page with movies
</a> using a web browser and click on the
368 torrent link to start streaming the movie.
</p>
370 <p>Note, there is still some misfeatures in the plugin. One is the
371 fact that it will hang and
372 <a href=
"https://github.com/johang/vlc-bittorrent/issues/13">block VLC
373 from exiting until the torrent streaming starts
</a>. Another is the
375 <a href=
"https://github.com/johang/vlc-bittorrent/issues/9">will pick
376 and play a random file in a multi file torrent
</a>. This is not
377 always the video file you want. Combined with the first it can be a
378 bit hard to get the video streaming going. But when it work, it seem
379 to do a good job.
</p>
381 <p>For the Debian packaging, I would love to find a good way to test
382 if the plugin work with VLC using autopkgtest. I tried, but do not
383 know enough of the inner workings of VLC to get it working. For now
384 the autopkgtest script is only checking if the .so file was
385 successfully loaded by VLC. If you have any suggestions, please
386 submit a patch to the Debian bug tracking system.
</p>
388 <p>As usual, if you use Bitcoin and want to show your support of my
389 activities, please send Bitcoin donations to my address
390 <b><a href=
"bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b
</a></b>.
</p>
395 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/video">video
</a>.
400 <div class=
"padding"></div>
403 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Release_0_2_of_free_software_archive_system_Nikita_announced.html">Release
0.2 of free software archive system Nikita announced
</a></div>
404 <div class=
"date">18th October
2018</div>
405 <div class=
"body"><p>This morning, the new release of the
406 <a href=
"https://gitlab.com/OsloMet-ABI/nikita-noark5-core/">Nikita
407 Noark
5 core project
</a> was
408 <a href=
"https://lists.nuug.no/pipermail/nikita-noark/2018-October/000406.html">announced
409 on the project mailing list
</a>. The free software solution is an
410 implementation of the Norwegian archive standard Noark
5 used by
411 government offices in Norway. These were the changes in version
0.2
412 since version
0.1.1 (from NEWS.md):
415 <li>Fix typos in REL names
</li>
416 <li>Tidy up error message reporting
</li>
417 <li>Fix issue where we used Integer.valueOf(), not Integer.getInteger()
</li>
418 <li>Change some String handling to StringBuffer
</li>
419 <li>Fix error reporting
</li>
420 <li>Code tidy-up
</li>
421 <li>Fix issue using static non-synchronized SimpleDateFormat to avoid
423 <li>Fix problem where deserialisers were treating integers as strings
</li>
424 <li>Update methods to make them null-safe
</li>
425 <li>Fix many issues reported by coverity
</li>
426 <li>Improve equals(), compareTo() and hash() in domain model
</li>
427 <li>Improvements to the domain model for metadata classes
</li>
428 <li>Fix CORS issues when downloading document
</li>
429 <li>Implementation of case-handling with registryEntry and document upload
</li>
430 <li>Better support in Javascript for OPTIONS
</li>
431 <li>Adding concept description of mail integration
</li>
432 <li>Improve setting of default values for GET on ny-journalpost
</li>
433 <li>Better handling of required values during deserialisation
</li>
434 <li>Changed tilknyttetDato (M620) from date to dateTime
</li>
435 <li>Corrected some opprettetDato (M600) (de)serialisation errors.
</li>
436 <li>Improve parse error reporting.
</li>
437 <li>Started on OData search and filtering.
</li>
438 <li>Added Contributor Covenant Code of Conduct to project.
</li>
439 <li>Moved repository and project from Github to Gitlab.
</li>
440 <li>Restructured repository, moved code into src/ and web/.
</li>
441 <li>Updated code to use Spring Boot version
2.
</li>
442 <li>Added support for OAuth2 authentication.
</li>
443 <li>Fixed several bugs discovered by Coverity.
</li>
444 <li>Corrected handling of date/datetime fields.
</li>
445 <li>Improved error reporting when rejecting during deserializatoin.
</li>
446 <li>Adjusted default values provided for ny-arkivdel, ny-mappe,
447 ny-saksmappe, ny-journalpost and ny-dokumentbeskrivelse.
</li>
448 <li>Several fixes for korrespondansepart*.
</li>
451 <li>Now handle both file upload and download.
</li>
452 <li>Uses new OAuth2 authentication for login.
</li>
453 <li>Forms now fetches default values from API using GET.
</li>
454 <li>Added RFC
822 (email), TIFF and JPEG to list of possible file formats.
</li>
458 <p>The changes and improvements are extensive. Running diffstat on
459 the changes between git tab
0.1.1 and
0.2 show
1098 files changed,
460 108666 insertions(+),
54066 deletions(-).
</p>
462 <p>If free and open standardized archiving API sound interesting to
463 you, please contact us on IRC
464 (
<a href=
"irc://irc.freenode.net/%23nikita">#nikita on
465 irc.freenode.net
</a>) or email
466 (
<a href=
"https://lists.nuug.no/mailman/listinfo/nikita-noark">nikita-noark
467 mailing list
</a>).
</p>
469 <p>As usual, if you use Bitcoin and want to show your support of my
470 activities, please send Bitcoin donations to my address
471 <b><a href=
"bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b
</a></b>.
</p>
476 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/nuug">nuug
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/standard">standard
</a>.
481 <div class=
"padding"></div>
484 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Fetching_trusted_timestamps_using_the_rfc3161ng_python_module.html">Fetching trusted timestamps using the rfc3161ng python module
</a></div>
485 <div class=
"date"> 8th October
2018</div>
486 <div class=
"body"><p>I have earlier covered the basics of trusted timestamping using the
487 'openssl ts' client. See blog post for
488 <a href=
"http://people.skolelinux.org/pere/blog/Public_Trusted_Timestamping_services_for_everyone.html">2014</a>,
489 <a href=
"http://people.skolelinux.org/pere/blog/syslog_trusted_timestamp___chain_of_trusted_timestamps_for_your_syslog.html">2016</a>
491 <a href=
"http://people.skolelinux.org/pere/blog/Idea_for_storing_trusted_timestamps_in_a_Noark_5_archive.html">2017</a>
492 for those stories. But some times I want to integrate the timestamping
493 in other code, and recently I needed to integrate it into Python.
494 After searching a bit, I found
495 <a href=
"https://dev.entrouvert.org/projects/python-rfc3161">the
496 rfc3161 library
</a> which seemed like a good fit, but I soon
497 discovered it only worked for python version
2, and I needed something
498 that work with python version
3. Luckily I next came across
499 <a href=
"https://github.com/trbs/rfc3161ng/">the rfc3161ng library
</a>,
500 a fork of the original rfc3161 library. Not only is it working with
501 python
3, it have fixed a few of the bugs in the original library, and
502 it has an active maintainer. I decided to wrap it up and make it
503 <a href=
"https://tracker.debian.org/pkg/python-rfc3161ng">available in
504 Debian
</a>, and a few days ago it entered Debian unstable and testing.
</p>
506 <p>Using the library is fairly straight forward. The only slightly
507 problematic step is to fetch the required certificates to verify the
508 timestamp. For some services it is straight forward, while for others
509 I have not yet figured out how to do it. Here is a small standalone
510 code example based on of the integration tests in the library code:
</p>
517 Python
3 script demonstrating how to use the rfc3161ng module to
518 get trusted timestamps.
520 The license of this code is the same as the license of the rfc3161ng
526 import pyasn1.codec.der
530 import urllib.request
537 def fetch(url, f=None):
538 response = urllib.request.urlopen(url)
539 data = response.read()
545 with tempfile.NamedTemporaryFile() as cert_f,\
546 tempfile.NamedTemporaryFile() as ca_f,\
547 tempfile.NamedTemporaryFile() as msg_f,\
548 tempfile.NamedTemporaryFile() as tsr_f:
550 # First fetch certificates used by service
551 certificate_data = fetch('https://freetsa.org/files/tsa.crt', cert_f)
552 ca_data_data = fetch('https://freetsa.org/files/cacert.pem', ca_f)
554 # Then timestamp the message
556 rfc3161ng.RemoteTimestamper('http://freetsa.org/tsr',
557 certificate=certificate_data)
558 data = b"Python forever!\n"
559 tsr = timestamper(data=data, return_tsr=True)
561 # Finally, convert message and response to something 'openssl ts' can verify
563 store(tsr_f, pyasn1.codec.der.encoder.encode(tsr))
564 args = ["openssl", "ts", "-verify",
567 "-CAfile", ca_f.name,
568 "-untrusted", cert_f.name]
569 subprocess.check_call(args)
571 if '__main__' == __name__:
575 <p>The code fetches the required certificates, store them as temporary
576 files, timestamp a simple message, store the message and timestamp to
577 disk and ask 'openssl ts' to verify the timestamp. A timestamp is
578 around
1.5 kiB in size, and should be fairly easy to store for future
581 <p>As usual, if you use Bitcoin and want to show your support of my
582 activities, please send Bitcoin donations to my address
583 <b><a href=
"bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b
</a></b>.
</p>
588 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/english">english
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet
</a>.
593 <div class=
"padding"></div>
596 <div class=
"title"><a href=
"http://people.skolelinux.org/pere/blog/Automatic_Google_Drive_sync_using_grive_in_Debian.html">Automatic Google Drive sync using grive in Debian
</a></div>
597 <div class=
"date"> 4th October
2018</div>
598 <div class=
"body"><p>A few days, I rescued a Windows victim over to Debian. To try to
599 rescue the remains, I helped set up automatic sync with Google Drive.
600 I did not find any sensible Debian package handling this
601 automatically, so I rebuild the grive2 source from
602 <a href=
"http://www.webupd8.org/">the Ubuntu UPD8 PPA
</a> to do the
603 task and added a autostart desktop entry and a small shell script to
604 run in the background while the user is logged in to do the sync.
605 Here is a sketch of the setup for future reference.
</p>
607 <p>I first created
<tt>~/googledrive
</tt>, entered the directory and
608 ran '
<tt>grive -a
</tt>' to authenticate the machine/user. Next, I
609 created a autostart hook in
<tt>~/.config/autostart/grive.desktop
</tt>
610 to start the sync when the user log in:
</p>
614 Name=Google drive autosync
616 Exec=/home/user/bin/grive-sync
617 </pre></blockquote></p>
619 <p>Finally, I wrote the
<tt>~/bin/grive-sync
</tt> script to sync
620 ~/googledrive/ with the files in Google Drive.
</p>
627 if [ "$syncpid" ] ; then
631 trap cleanup EXIT INT QUIT
632 /usr/lib/grive/grive-sync.sh listen googledrive
2>&
1 | sed "s%^%$
0:%" &
635 if ! xhost
>/dev/null
2>&
1 ; then
636 echo "no DISPLAY, exiting as the user probably logged out"
639 if [ ! -e /run/user/
1000/grive-sync.sh_googledrive ] ; then
640 /usr/lib/grive/grive-sync.sh sync googledrive
643 done
2>&
1 | sed "s%^%$
0:%"
644 </pre></blockquote></p>
646 <p>Feel free to use the setup if you want. It can be assumed to be
647 GNU GPL v2 licensed (or any later version, at your leisure), but I
648 doubt this code is possible to claim copyright on.
</p>
650 <p>As usual, if you use Bitcoin and want to show your support of my
651 activities, please send Bitcoin donations to my address
652 <b><a href=
"bitcoin:15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b">15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b
</a></b>.
</p>
657 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>.
662 <div class=
"padding"></div>
664 <p style=
"text-align: right;"><a href=
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"http://people.skolelinux.org/pere/blog/xml.gif" alt=
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"http://people.skolelinux.org/pere/blog/archive/2009/07/">July (
4)
</a></li>
946 <li><a href=
"http://people.skolelinux.org/pere/blog/archive/2009/08/">August (
3)
</a></li>
948 <li><a href=
"http://people.skolelinux.org/pere/blog/archive/2009/09/">September (
1)
</a></li>
950 <li><a href=
"http://people.skolelinux.org/pere/blog/archive/2009/10/">October (
2)
</a></li>
952 <li><a href=
"http://people.skolelinux.org/pere/blog/archive/2009/11/">November (
3)
</a></li>
954 <li><a href=
"http://people.skolelinux.org/pere/blog/archive/2009/12/">December (
3)
</a></li>
961 <li><a href=
"http://people.skolelinux.org/pere/blog/archive/2008/11/">November (
5)
</a></li>
963 <li><a href=
"http://people.skolelinux.org/pere/blog/archive/2008/12/">December (
7)
</a></li>
974 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (
16)
</a></li>
976 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/amiga">amiga (
1)
</a></li>
978 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/aros">aros (
1)
</a></li>
980 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/bankid">bankid (
4)
</a></li>
982 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (
10)
</a></li>
984 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (
17)
</a></li>
986 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/bsa">bsa (
2)
</a></li>
988 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (
2)
</a></li>
990 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/debian">debian (
164)
</a></li>
992 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (
158)
</a></li>
994 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (
4)
</a></li>
996 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/digistan">digistan (
10)
</a></li>
998 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/dld">dld (
17)
</a></li>
1000 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/docbook">docbook (
25)
</a></li>
1002 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (
4)
</a></li>
1004 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/english">english (
394)
</a></li>
1006 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (
23)
</a></li>
1008 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (
13)
</a></li>
1010 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (
32)
</a></li>
1012 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (
9)
</a></li>
1014 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (
19)
</a></li>
1016 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/h264">h264 (
20)
</a></li>
1018 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/intervju">intervju (
42)
</a></li>
1020 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (
16)
</a></li>
1022 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/kart">kart (
20)
</a></li>
1024 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/kodi">kodi (
4)
</a></li>
1026 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ldap">ldap (
9)
</a></li>
1028 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/lego">lego (
4)
</a></li>
1030 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/lenker">lenker (
8)
</a></li>
1032 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (
2)
</a></li>
1034 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (
1)
</a></li>
1036 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (
8)
</a></li>
1038 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (
41)
</a></li>
1040 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (
11)
</a></li>
1042 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/norsk">norsk (
300)
</a></li>
1044 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/nuug">nuug (
191)
</a></li>
1046 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (
34)
</a></li>
1048 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/open311">open311 (
2)
</a></li>
1050 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (
72)
</a></li>
1052 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/personvern">personvern (
108)
</a></li>
1054 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/raid">raid (
2)
</a></li>
1056 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/reactos">reactos (
1)
</a></li>
1058 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/reprap">reprap (
11)
</a></li>
1060 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/rfid">rfid (
3)
</a></li>
1062 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/robot">robot (
10)
</a></li>
1064 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/rss">rss (
1)
</a></li>
1066 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ruter">ruter (
6)
</a></li>
1068 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (
2)
</a></li>
1070 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (
55)
</a></li>
1072 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (
4)
</a></li>
1074 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (
5)
</a></li>
1076 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/standard">standard (
58)
</a></li>
1078 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (
6)
</a></li>
1080 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (
12)
</a></li>
1082 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (
55)
</a></li>
1084 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (
4)
</a></li>
1086 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/usenix">usenix (
2)
</a></li>
1088 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/valg">valg (
9)
</a></li>
1090 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (
14)
</a></li>
1092 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/video">video (
71)
</a></li>
1094 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (
4)
</a></li>
1096 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/web">web (
42)
</a></li>
1102 <p style=
"text-align: right">
1103 Created by
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