[tor-bugs] #22688 [Core Tor/Tor]: hs: stop HSDirs being used as single-hop "proxies"

Mon Jul 2 05:10:31 UTC 2018

#22688: hs: stop HSDirs being used as single-hop "proxies"
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs, relay-safety,                |  Actual Points:  0.3
  034-triage-20180328, 034-removed-20180328      |
Parent ID:  #17945                               |         Points:  0.3
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Description changed by teor:

Old description:

> handle_post_hs_descriptor and handle_get_hs_descriptor_v3 should check
> that the connection is:
> * encrypted, and
> * not from a client (channel_is_client in 0.3.1.1-alpha and later
> correctly identifies unauthenticated peers, which are clients and
> bridges).
>
> For extra safety, we can check if the circuit is from a relay.

New description:

 handle_post_hs_descriptor and handle_get_hs_descriptor_v3 should check
 that the connection is:
 * encrypted, and
 * not from a client (channel_is_client in 0.3.1.1-alpha and later
 correctly identifies unauthenticated peers, which are clients and
 bridges).

 For HSv2, we should allow direct Tor2web client connections by default,
 but have a consensus parameter to turn them off. Direct service
 connections should always be refused,

--

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22688#comment:21>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online