Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:  closed
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  implemented
  pre028-patch, 201511-deferred, |  Actual Points:
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005|
Parent ID:   | Points:  6
 Reviewer:  nickm|Sponsor:
-+-

Comment (by mikeperry):

 nickm: based on behavior, #17592 and #17604 are bugfixes on 0.2.5.5-alpha.
 that is the last time we changed that behavior (for #6799)

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:  closed
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  implemented
  pre028-patch, 201511-deferred, |  Actual Points:
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005|
Parent ID:   | Points:  6
 Reviewer:  nickm|Sponsor:
-+-
Changes (by nickm):

 * status:  merge_ready => closed
 * resolution:   => implemented


Comment:

 Merging this, at last!  Also merging mikeperry/padding_spec to torspec.
 Thanks for all the hard work here.  This is big, so let's keep an eye on
 it.

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  merge_ready
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005|
Parent ID:   | Points:  6
 Reviewer:  nickm|Sponsor:
-+-

Comment (by mikeperry):

 So one other moving piece here is that I also change the is_client flag to
 be accurate (similar to #21406 and #21585). I check the consensus, where
 as checking for authentication usage might be cleaner, or it might not be.
 I am still inclined to think that the is_client checks should be based on
 the consensus rather than behavior-based, but we should probably decide on
 a single thing here.

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  merge_ready
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005|
Parent ID:   | Points:  6
 Reviewer:  nickm|Sponsor:
-+-
Changes (by dgoulet):

 * status:  needs_revision => merge_ready


Comment:

 Latest update to `mikeperry/netflow_padding-v6-rebased2` fixes the above
 issue (and the entrynodes test failing was already failing on the initial
 commit).

 I'm moving this to `merge_ready` for nickm to take a final look/merge.

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005|
Parent ID:   | Points:  6
 Reviewer:  nickm|Sponsor:
-+-

Comment (by dgoulet):

 Thanks!

 Now I have this issue with the `make test` (with `--enable-fragile-
 hardening`):

 {{{
 channelpadding/channelpadding_decide_to_pad_channel: [forking] Apr 28
 15:28:31.309 [warn] channelpadding_compute_time_until_pad_for_netflow():
 Bug: Channel padding timeout scheduled 100ms in the past. Did the
 monotonic clock just jump? (on Tor 0.3.1.0-alpha-dev bbef0dff69debfee)
 OK
 channelpadding/channelpadding_negotiation: [forking]
 src/test/test_channelpadding.c:637:56: runtime error: member access within
 misaligned address 0x7fffd1aec815 for type 'struct
 channelpadding_negotiate_t', which requires 2 byte alignment
 0x7fffd1aec815: note: pointer points here
  00 00 00 0c 00 01 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 00 00 00 00 00 00 00 00  00
  ^
 src/test/test_channelpadding.c:645:56: runtime error: member access within
 misaligned address 0x7fffd1aec815 for type 'struct
 channelpadding_negotiate_t', which requires 2 byte alignment
 0x7fffd1aec815: note: pointer points here
  00 00 00 0c 01 01 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 00 00 00 00 00 00 00 00  00
  ^
 OK
 }}}

 And this but maybe this is not related to your code and has been fixed
 since (dunno..):

 {{{
 entrynodes/parse_from_state_full: [forking]
   FAIL src/test/test_entrynodes.c:618:
 assert(smartlist_len(gs_br->sampled_entry_guards) OP_EQ 2): 0 vs 2
   [parse_from_state_full FAILED]
 }}}

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005|
Parent ID:   | Points:  6
 Reviewer:  nickm|Sponsor:
-+-

Comment (by mikeperry):

 Arg, I was compiling without --enable-fatal-warnings so I missed that.

 Anyway that was another one of those places where Nick asked to make as
 many things const as possible, which conflicts with using
 channel_is_client(). I reverted removed that commit and pushed the
 previous commit hash to a new branch:
 mikeperry/netflow_padding-v6-rebased2. That branch head is
 bbef0dff69debfeeca4e4bc2980a8e1812aaffdd.

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005|
Parent ID:   | Points:  6
 Reviewer:  nickm|Sponsor:
-+-
Changes (by dgoulet):

 * status:  needs_review => needs_revision


Comment:

 Quite happy with the fixes!

 *HOWEVER*, the branch doesn't compile :).

 {{{
 src/or/channelpadding.c: In function
 ‘channelpadding_get_channel_idle_timeout’:
 src/or/channelpadding.c:567:42: error: passing argument 1 of
 ‘channel_is_client’ discards ‘const’ qualifier from pointer target type
 [-Werror=discarded-qualifiers]
if (!is_canonical || CHANNEL_IS_CLIENT(chan, options)) {
   ^
 src/or/channelpadding.c:69:56: note: in definition of macro
 ‘CHANNEL_IS_CLIENT’
(!public_server_mode((options)) || channel_is_client(chan) || \
 ^~~~
 In file included from src/or/channelpadding.c:12:0:
 src/or/channel.h:668:5: note: expected ‘channel_t * {aka struct channel_s
 *}’ but argument is of type ‘const channel_t * {aka const struct channel_s
 *}’
  int channel_is_client(channel_t *chan);
  ^
 }}}

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005|
Parent ID:   | Points:  6
 Reviewer:  nickm|Sponsor:
-+-
Changes (by mikeperry):

 * status:  needs_revision => needs_review


Comment:

 I fixed the issues from gitlab last week btw. Updates are in a couple of
 commits on my branch. Let me know if I should be rebasing again and/or
 squashing back down into a couple of commits for a merge. Otherwise I am
 waiting for more comments.

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005|
Parent ID:   | Points:  6
 Reviewer:  nickm|Sponsor:
-+-
Changes (by dgoulet):

 * status:  needs_review => needs_revision
 * points:  2 => 6


Comment:

 Made comments on the gitlab. Nothing show stopper but there are multiple
 things I would like addressed before merge so we don't end up forgetting
 it in the void of Tor Unspecified trac refactoring ticket.

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005|
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
-+-

Comment (by dgoulet):

 Pushed the branch to my Gitlab for review:

 Branch: `netflow_padding-v6-rebased`
 https://gitlab.com/dgoulet/tor/merge_requests/24

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  High |  Milestone:  Tor:
 |  0.3.1.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9, nickm-deferred-20161005,   |
  review-group-16|
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
-+-

Comment (by mikeperry):

 FYI this branch and the subtickets were rebased on to master a week or so
 ago in mikeperry/netflow_padding-v6-rebased
 (0b572b90f77bb466d8e1946aa6b0ff2fd131ca4d)

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  High |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9 |
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
 |  SponsorU-can
-+-
Changes (by mikeperry):

 * status:  needs_revision => needs_review


Comment:

 Ok, I commented to everything on that gitlab link and posted links to
 commits.

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  High |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9 |
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
 |  SponsorU-can
-+-

Comment (by nickm):

 [I'll review the other tickets fixed by that branch separately]

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_revision
 Priority:  High |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9 |
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
 |  SponsorU-can
-+-
Changes (by nickm):

 * status:  needs_review => needs_revision


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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  High |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9 |
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
 |  SponsorU-can
-+-

Comment (by nickm):

 I've been over this one on gitlab, and asked a bunch of questions, and
 noted a few places that could use a small amount of tidying.  This patch
 is looking nice!

 Now that I've started on this review, please just add fixup commits to
 this branch, rather than rebasing or starting a new one: it will make
 changes much much easier for me to track.

 (Also, can tell me about your performance testing?)

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  High |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905, |
  review-group-9 |
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
 |  SponsorU-can
-+-

Comment (by nickm):

 I've opened https://gitlab.com/nickm_tor/tor/merge_requests/8 to do the
 commentary here.

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  High |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905  |
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
 |  SponsorU-can
-+-

Comment (by teor):

 A reminder that if we merge Single Onion Services (#17178) and Netflow
 Padding (#16861) in 0.2.9, we'll likely want a Consensus Parameter to
 Disable Netflow Padding For Single Onion Services (#17857) as well.

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Re: [tor-bugs] #16861 [Core Tor/Tor]: Pad Tor connections to collapse netflow records

[Tor Bug Tracker & Wiki]

#16861: Pad Tor connections to collapse netflow records
-+-
 Reporter:  mikeperry|  Owner:
 |  mikeperry
 Type:  enhancement  | Status:
 |  needs_review
 Priority:  High |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:
 Severity:  Normal   | Resolution:
 Keywords:  028-triage, 028-triaged, |  Actual Points:
  pre028-patch, 201511-deferred, |
  201512-deferred, tor-guard, TorCoreTeam-   |
  postponed-201604, nickm-deferred-20160905  |
Parent ID:   | Points:  2
 Reviewer:  nickm|Sponsor:
 |  SponsorU-can
-+-
Changes (by mikeperry):

 * status:  needs_revision => needs_review
 * milestone:  Tor: 0.2.??? => Tor: 0.2.9.x-final


Comment:

 Alright. I switched the code over to using the new handle, monotonic
 timer, and timer wheel abstractions. All unit tests pass without leaks
 from this code (though the unit tests have grown new memory leaks of their
 own).

 mikeperry/netflow_padding-v6. The commit specific to this bug is
 a51a998555b352043437cccbfc2758ab9b737925.

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