posting hidden service descriptors

[Karsten Loesing]

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Hi James,

> I am trying to sort out a few low-level details about hidden services.
> 
> I know that hidden servers must post their descriptors to the DAs
> anonymously to avoid exposing their IP addresses.  Is this done through
> a normal (i.e. three hop) circuit?  I suspect it is not because in
> src/or/circuitbuild.c there is a condition for creating one-hop tunnels
> and a log message "Launching a one-hop circuit for dir tunnel."
> 
> My concern here is that using a one-hop circuit exposes the origin of
> the hidden service to that onion router (i.e. the one-hop).  Even if the
> data the one-hop relays to the DA from the OP is encrypted, the one-hop
> still learns an IP address which originates some hidden service
> (although, it may not be certain which one exactly).

Just a guess: Maybe Tor is "cannibalizing" an already existing circuit
and adding another hop before connecting to the directory? A one-hop
solution would case headaches for me, too. :)

Karsten
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