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6 <title>Petter Reinholdtsen: entries from January
2016</title>
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15 <a href=
"http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen
</a>
22 <h3>Entries from January
2016.
</h3>
26 <a href=
"http://people.skolelinux.org/pere/blog/Always_download_Debian_packages_using_Tor___the_simple_recipe.html">Always download Debian packages using Tor - the simple recipe
</a>
32 <p>During his DebConf15 keynote, Jacob Applebaum
33 <a href=
"https://summit.debconf.org/debconf15/meeting/331/what-is-to-be-done/">observed
34 that those listening on the Internet lines would have good reason to
35 believe a computer have a given security hole
</a> if it download a
36 security fix from a Debian mirror. This is a good reason to always
37 use encrypted connections to the Debian mirror, to make sure those
38 listening do not know which IP address to attack. In August, Richard
39 Hartmann observed that encryption was not enough, when it was possible
40 to interfere download size to security patches or the fact that
41 download took place shortly after a security fix was released, and
42 <a href=
"http://richardhartmann.de/blog/posts/2015/08/24-Tor-enabled_Debian_mirror/">proposed
43 to always use Tor to download packages from the Debian mirror
</a>. He
44 was not the first to propose this, as the
<tt>apt-transport-tor
</tt>
45 package by Tim Retout already existed to make it easy to convince apt
46 to use
<a href=
"https://www.torproject.org/">Tor
</a>, but I was not
47 aware of that package when I read the blog post from Richard.
</p>
49 <p>Richard discussed the idea with Peter Palfrader, one of the Debian
50 sysadmins, and he set up a Tor hidden service on one of the central
51 Debian mirrors using the address vwakviie2ienjx6t.onion, thus making
52 it possible to download packages directly between two tor nodes,
53 making sure the network traffic always were encrypted.
</p>
55 <p>Here is a short recipe for enabling this on your machine, by
56 installing
<tt>apt-transport-tor
</tt> and replacing http and https
57 urls with tor+http and https, and using the hidden service instead of
58 the official Debian mirror site. I recommend installing
59 <tt>etckeeper
</tt> before you start to have a history of the changes
63 apt install apt-transport-tor
64 sed -i 's% http://ftp.debian.org/%tor+http://vwakviie2ienjx6t.onion/%' /etc/apt/sources.list
65 sed -i 's% http% tor+http%' /etc/apt/sources.list
68 <p>If you have more sources listed in /etc/apt/sources.list.d/, run
69 the sed commands for these too. The sed command is assuming your are
70 using the ftp.debian.org Debian mirror. Adjust the command (or just
71 edit the file manually) to match your mirror.
</p>
73 <p>This work in Debian Jessie and later. Note that tools like
74 <tt>apt-file
</tt> only recently started using the apt transport
75 system, and do not work with these tor+http URLs. For
76 <tt>apt-file
</tt> you need the version currently in experimental,
77 which need a recent apt version currently only in unstable. So if you
78 need a working
<tt>apt-file
</tt>, this is not for you.
</p>
80 <p>Another advantage from this change is that your machine will start
81 using Tor regularly and at fairly random intervals (every time you
82 update the package lists or upgrade or install a new package), thus
83 masking other Tor traffic done from the same machine. Using Tor will
84 become normal for the machine in question.
</p>
86 <p>On
<a href=
"https://wiki.debian.org/FreedomBox">Freedombox
</a>, APT
87 is set up by default to use
<tt>apt-transport-tor
</tt> when Tor is
88 enabled. It would be great if it was the default on any Debian
95 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/sikkerhet">sikkerhet
</a>.
100 <div class=
"padding"></div>
104 <a href=
"http://people.skolelinux.org/pere/blog/Nedlasting_fra_NRK__som_Matroska_med_undertekster.html">Nedlasting fra NRK, som Matroska med undertekster
</a>
110 <p>Det kommer stadig nye løsninger for å ta lagre unna innslag fra NRK
111 for å se på det senere. For en stund tilbake kom jeg over et script
112 nrkopptak laget av Ingvar Hagelund. Han fjernet riktignok sitt script
113 etter forespørsel fra Erik Bolstad i NRK, men noen tok heldigvis og
114 gjorde det
<a href=
"https://github.com/liangqi/nrkopptak">tilgjengelig
117 <p>Scriptet kan lagre som MPEG4 eller Matroska, og bake inn
118 undertekster i fila på et vis som blant annet VLC forstår. For å
119 bruke scriptet, kopier ned git-arkivet og kjør
</p>
122 nrkopptak/bin/nrk-opptak k
<ahref=
"https://tv.nrk.no/serie/bmi-turne/MUHH45000115/sesong-1/episode-1">https://tv.nrk.no/serie/bmi-turne/MUHH45000115/sesong-
1/episode-
1</a>
125 <p>URL-eksemplet er dagens toppsak på tv.nrk.no. Argument 'k' ber
126 scriptet laste ned og lagre som Matroska. Det finnes en rekke andre
127 muligheter for valg av kvalitet og format.
</p>
129 <p>Jeg foretrekker dette scriptet fremfor youtube-dl, som
130 <a href=
"http://people.skolelinux.org/pere/blog/Hvordan_enkelt_laste_ned_filmer_fra_NRK_med_den__nye__l_sningen.html">
131 nevnt i
2014 støtter NRK
</a> og en rekke andre videokilder, på grunn
132 av at nrkopptak samler undertekster og video i en enkelt fil, hvilket
133 gjør håndtering enklere på disk.
</p>
139 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/norsk">norsk
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/video">video
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/web">web
</a>.
144 <div class=
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3)
</a></li>
462 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/robot">robot (
9)
</a></li>
464 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/rss">rss (
1)
</a></li>
466 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ruter">ruter (
4)
</a></li>
468 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (
2)
</a></li>
470 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (
45)
</a></li>
472 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (
4)
</a></li>
474 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (
4)
</a></li>
476 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/standard">standard (
48)
</a></li>
478 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (
3)
</a></li>
480 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (
10)
</a></li>
482 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (
36)
</a></li>
484 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (
2)
</a></li>
486 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/usenix">usenix (
2)
</a></li>
488 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/valg">valg (
8)
</a></li>
490 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/video">video (
55)
</a></li>
492 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (
4)
</a></li>
494 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/web">web (
38)
</a></li>
500 <p style=
"text-align: right">
501 Created by
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