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Hi Tim,<br>
<br>
you hit me hard today because I didn't think about the privacy of
the users :-)<br>
But the data points for read and write are just average values and
the time series database also only stores the average values. So I
don't think that just by looking at the graph you can track specific
Hidden Services or make other attempts. They would get better
precision if they trace the IP of the server.<br>
<br>
~Josef<br>
<br>
<div class="moz-cite-prefix">Am 25.11.2015 um 23:33 schrieb Tim
Wilson-Brown - teor:<br>
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<div class="">On 26 Nov 2015, at 05:36, Josef Stautner <<a
moz-do-not-send="true" href="mailto:hello@veloc1ty.de"
class=""><a class="moz-txt-link-abbreviated" href="mailto:hello@veloc1ty.de">hello@veloc1ty.de</a></a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div class="">Hello @all,<br class="">
<br class="">
(I'm not sure if you guys are interested in a topic like
this)<br class="">
I wrote a perl script to gather bandwidth data from my Tor
exit relay.<br class="">
The script connects to the Tor control socket, fetches the
running<br class="">
config to extract the bandwidth limits and the reject rule
count.<br class="">
Afterwards the last 60 bw-cache entries are fetched and
average values<br class="">
are built for bandwidth in and out.<br class="">
All this performance data is then forwarded to
Nagios/Icinga where you<br class="">
can do anything with that values.<br class="">
<br class="">
Every 30 minutes a cronjob renders the graph showing the
datapoints of<br class="">
the last 6 houres and uploads the resulting image to my
website. You can<br class="">
find the image here (Hint: The values for in and out are
stacked):<br class="">
<a moz-do-not-send="true"
href="https://blog.veloc1ty.de/bandwidth-large.png"
class="">https://blog.veloc1ty.de/bandwidth-large.png</a><br
class="">
<br class="">
The source of the script can be found here on GitHub:<br
class="">
<a class="moz-txt-link-freetext" href="https://github.com/vlcty/check_tor_bandwidth">https://github.com/vlcty/check_tor_bandwidth</a><br class="">
It's released under the GPLv3<br class="">
<br class="">
Maybe somebody will find it usefull :-)<br class="">
</div>
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<div><br class="">
</div>
Hi Josef,</div>
<div><br class="">
</div>
<div>Thanks for creating this tool - it looks like a great way for
operators to keep an eye on their relay.<br class="">
<br class="">
</div>
<div>But I wonder about the privacy implications of making a
relay's high-resolution bandwidth figures public.</div>
<div>For example, attacker can correlate a traffic-based attack on
a hidden service, with a traffic peak on its Guards.</div>
<div>(I am not sure if any similar attack applies to Exits, or any
other role Exits may have.)</div>
<div>We previously moved to a bandwidth statistics interval of 6
hours for this reason.</div>
<div>(That's why the 3 days and 1 month bandwidth graphs are empty
on Globe.)</div>
<div><br class="">
</div>
<div>You lose a certain amount of precision moving to a graph,
rather than reporting exact figures in a data file.</div>
<div>But I'm not sure if that's enough to avoid the attack I
described above.</div>
<div><br class="">
</div>
<div>Tim</div>
<br class="">
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class="">
<div style="color: rgb(0,
0, 0); letter-spacing:
normal; text-transform:
none; white-space:
normal; word-spacing:
0px;
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0px; orphans: auto;
text-align: start;
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class="">Tim
Wilson-Brown (teor)</div>
<div style="color: rgb(0,
0, 0); letter-spacing:
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none; white-space:
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class=""><br class="">
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class="">teor2345 at
gmail dot com<br
class="">
PGP 968F094B<br class="">
<br class="">
teor at blah dot im<br
class="">
OTR CAD08081
9755866D 89E2A06F E3558B7F
B5A9D14F</div>
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