[tor-relays] Correctly setting up arm

[Chris Whittleston <csw34@xxxxxxxxx>]

Dear all,

Previously, I've run arm using 'sudo -u debian-tor arm'. As was mentioned here previously, this is not how you should run it - in fact there is a bit of documentation to suggest how it should be done. Unfortunately I'm having some issues getting arm working correctly as described here in step 14:

https://www.torproject.org/docs/tor-relay-debian.html.en#after

Having added my user (pi) to the debian-tor group, I try to run 'arm' and get the following:

Failed to read authentication cookie (permission denied): /var/run/tor/control.authcookie

I've tried reinstalling arm, relogged and checked that I'm in the right group still using 'groups' (which I am) - no joy.

I've checked my torrc and found the following lines:

## If you enable the controlport, be sure to enable one of these

## authentication methods, to prevent attackers from accessing it.

#HashedControlPassword 16:872860B76453A77D60CA2BB8C1A7042072093276A3D701AD684053EC4C

#CookieAuthentication 1

CookieAuthentication wasn't initially enabled, turning it on makes no difference, I get the same error.Â

I am able to get it working when setting up HashedControlPassword by generating a has using tor --hash-password <password> and editing torrc accordingly.

Am I missing something when it comes to setting up CookieAuthentication? I guess I must be...although it seems strange that I was getting that error even with CookieAuthentication disabled.

Any insight appreciated :)

Chris

--
Dr Chris WhittlestonÂæä
Department of Chemistry
University of Cambridge
Lensfield Road, Cambridge, CB2 1EW
Email: csw34@xxxxxxxxx
Tel: +44 (0)1223 336423

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