[tor-bugs] #27896 [Core Tor/Tor]: base32 padding inconsistency between client and server in HS v3 client auth preview

Tor Bug Tracker & Wiki blackhole at torproject.org
Fri Oct 19 19:19:32 UTC 2018


#27896: base32 padding inconsistency between client and server in HS v3 client auth
preview
--------------------------+------------------------------------
 Reporter:  jchevali      |          Owner:  (none)
     Type:  defect        |         Status:  needs_information
 Priority:  Medium        |      Milestone:  Tor: unspecified
Component:  Core Tor/Tor  |        Version:  Tor: 0.3.5.1-alpha
 Severity:  Normal        |     Resolution:
 Keywords:  tor-hs        |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
--------------------------+------------------------------------

Comment (by jchevali):

 I've tried to pick up on this test but I can't even get that far.

 Now I got client-side errors when trying to connect to a v3 HS with user
 authentication defined for it, even before the client has defined his own
 client-side bit of the authentication.

 I got a file at the server inside the HS folder with .auth extension
 containing this:

 {{{
 descriptor:x25519:LSHKYRU3WPY3QW6HZWET6UW4IKU2WZXRWAVVZZVGR2NROXJ3WQZQ
 }}}

 What I get at the client side when I try to connect to this HS is this:

 {{{
 Oct 19 20:08:06.000 [warn] Failed to store hidden service descriptor
 Oct 19 20:08:06.000 [warn] Encrypted service descriptor MAC check failed
 Oct 19 20:08:06.000 [warn] Decrypting encrypted desc failed.
 Oct 19 20:08:06.000 [warn] Service descriptor decryption failed.
 Oct 19 20:08:06.000 [warn] Could not parse received descriptor as client.
 Oct 19 20:08:06.000 [warn] Failed to parse received descriptor "..."(lots
 of stuff)[...truncated]
 }}}

 Is this the way the client is meant to convey that it does not possess the
 right credentials for this HS?  With a long series of warnings thrown to
 the log?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27896#comment:4>
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