Re: [tor-bugs] #2749 [Tor Hidden Services]: Persistent storage for HSDir descriptors

["Tor Bug Tracker & Wiki" <torproject-admin@xxxxxxxxxxxxxx>]

#2749: Persistent storage for HSDir descriptors
---------------------------------+------------------------------------------
 Reporter:  special              |          Owner:  rransom
     Type:  enhancement          |         Status:  new    
 Priority:  normal               |      Milestone:         
Component:  Tor Hidden Services  |        Version:         
 Keywords:                       |         Parent:         
   Points:                       |   Actualpoints:         
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Comment(by rransom):

 Replying to [ticket:2749 special]:
 > Store descriptors on HSDir nodes on disk, rather than in memory, so they
 can persist between Tor restarts, and to avoid excessive memory usage if
 the directory becomes large.

 One of the drawbacks of this (with the current v2 HS directory protocol)
 is that it makes enumeration of hidden service names much easier.
 Currently, an attacker can make a list of most, if not all, hidden service
 names in use by running one or more HSDir relays modified to log the
 hidden services' identity keys (contained in the descriptors) to disk; if
 we make Tor log the descriptors to disk ourselves, there is no longer
 ''any'' barrier to performing this 'attack'.  Do we care about this issue?

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2749#comment:1>
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