#23387: prop224: HSdir index desynch between client and service -----------------------------+------------------------------------ Reporter: asn | Owner: (none) Type: defect | Status: new Priority: High | Milestone: Tor: 0.3.2.x-final Component: Core Tor/Tor | Version: Severity: Normal | Resolution: Keywords: prop224, tor-hs | Actual Points: Parent ID: | Points: Reviewer: | Sponsor: -----------------------------+------------------------------------ Description changed by asn:
Old description: > David found his client unable to connect to his service. Apparently, they > compute different hsdir indices because the time period num is not > synched: > {{{ > service side: Sep 01 12:36:59.000 [info] hs_get_responsible_hsdirs(): > Finding responsible HSDirs for blinded key > mCs1ObO+OmLpjYy36SWX3tv5rV9S2P6/BNo8rVjUy0g, time period number 17411 and > for next period > }}} > {{{ > client side: Sep 01 08:23:34.000 [info] hs_get_responsible_hsdirs: > Finding responsible HSDirs for blinded key > 3vsekKmh3WYjr85reqpS6Ts2xqJxSSgZHxgX/Jp1FK0, time period number 17410 and > for current period > }}} > > Theory: We use `time(NULL)` as the time in `node_set_hsdir_index()` > whereas we use the live consensus `valid-after` in > `rotate_all_descriptors()`. This can cause desynch within the same tor > instance. We should probably use the live consensus `valid-after` in all > cases to have a common point of reference, and avoid problems with clock > skews. New description: David found his client unable to connect to his service. Apparently, they compute different hsdir indices, since it was 12:20UTC (non-overlap period) and the live consensus had valid-after at 11:00UTC (overlap period). Apparently something got confused. Theory: We use `time(NULL)` as the time in `node_set_hsdir_index()` whereas we use the live consensus `valid-after` in `rotate_all_descriptors()`. This can cause desynch within the same tor instance. We should probably use the live consensus `valid-after` in all cases to have a common point of reference, and avoid problems with clock skews. -- -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23387#comment:1> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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