Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
+
 Reporter:  korobkov|  Owner:  (none)
 Type:  defect  | Status:  new
 Priority:  Medium  |  Milestone:
Component:  Circumvention/Obfs4 |Version:
 Severity:  Normal  | Resolution:
 Keywords:  needs-spec-change needs-tor-change  |  Actual Points:
Parent ID:  | Points:
 Reviewer:  |Sponsor:
+
Changes (by arma):

 * component:  Archived/Obfsproxy => Circumvention/Obfs4


Comment:

 rescuing a ticket that still matters.

 we would also need a way for the parent (tor) to tell the child
 (obfsproxy) about this request.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:
  change,sponsor19-can   |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
 |  Sponsor19
-+-
Changes (by ahf):

 * keywords:  needs-spec-change needs-tor-change => needs-spec-change needs-
 tor-change,sponsor19-can
 * sponsor:   => Sponsor19


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:
  change,sponsor19-can   |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
 |  Sponsor19
-+-

Comment (by ahf):

 There should also be an option for clients, since clients are also used
 for HS operators (which are more server-like).

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:
  change,sponsor19-can   |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
 |  Sponsor19
-+-

Comment (by arma):

 Sounds like it could be the same option for both clients and server side,
 but we would want to pick a more general name than FOO_SERVER_BAR.

 For example, something like TOR_PT_OUTBOUND_BIND_ADDRESS would be an ok
 color for the bike shed.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:
  change,sponsor19-can   |
Parent ID:   | Points:
 Reviewer:   |Sponsor:
 |  Sponsor19
-+-

Comment (by ahf):

 But it's not just for binding it is also for being used as source address
 for outgoing connections. Maybe `TOR_PT_OUTBOUND_ADDRESS` ?

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:
  change,sponsor19-can   |
Parent ID:  #30471   | Points:
 Reviewer:   |Sponsor:
 |  Sponsor19
-+-
Changes (by phw):

 * parent:   => #30471


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:
  change,sponsor19-can   |
Parent ID:  #30471   | Points:
 Reviewer:   |Sponsor:
 |  Sponsor19
-+-

Comment (by phw):

 Replying to [comment:11 ahf]:
 > But it's not just for binding it is also for being used as source
 address for outgoing connections. Maybe `TOR_PT_OUTBOUND_ADDRESS` ?

 I don't follow: isn't "use this address for an outgoing connection" also
 called "binding"? And that's why we call it `OutboundBindAddress` in tor?

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:  new
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:
  change,sponsor19-can   |
Parent ID:  #30471   | Points:
 Reviewer:   |Sponsor:
 |  Sponsor19
-+-

Comment (by ahf):

 Replying to [comment:13 phw]:
 > I don't follow: isn't "use this address for an outgoing connection" also
 called "binding"? And that's why we call it `OutboundBindAddress` in tor?

 You are right. I think I thought we had another option similar to this
 that didn't have Bind in its name. It looks like we don't.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.2
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:   |Sponsor:
 |  Sponsor19
-+-
Changes (by ahf):

 * status:  new => needs_review
 * points:   => 1
 * actualpoints:   => 0.2


Comment:

 Added a spec patch here:
 https://github.com/ahf/torspec/commit/c5ed6c20a9c38c15bae61821d81a97bc79e59b9c

 Asking phw and dcf on IRC if one of them is up for reviewing.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.2
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:   |Sponsor:
 |  Sponsor19
-+-

Comment (by phw):

 Replying to [comment:15 ahf]:
 > Added a spec patch here:
 https://github.com/ahf/torspec/commit/c5ed6c20a9c38c15bae61821d81a97bc79e59b9c
 >
 > Asking phw and dcf on IRC if one of them is up for reviewing.

 I have three minor remarks that I left as comments in your GitHub patch.
 Other than that, it looks good to me!

 One more question: Do we currently have any PTs where the server proxy
 could use this feature? As I understand, in all our deployed PTs, only the
 client proxies are making outgoing connections.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.2
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:   |Sponsor:
 |  Sponsor19
-+-

Comment (by ahf):

 Replying to [comment:16 phw]:
 > I have three minor remarks that I left as comments in your GitHub patch.
 Other than that, it looks good to me!

 Should be fixed with
 https://github.com/ahf/torspec/commit/18fead7a8b968107df0b39ca241d758a162db919

 > One more question: Do we currently have any PTs where the server proxy
 could use this feature? As I understand, in all our deployed PTs, only the
 client proxies are making outgoing connections.

 I don't think we do right now, no.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.2
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor19
-+-
Changes (by ahf):

 * reviewer:   => phw


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.2
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor19
-+-

Comment (by dcf):

 Does tor need to care whether the PT proxy understands/honors
 `TOR_PT_OUTBOUND_BIND_ADDRESS`? tor can set the variable but it will be
 ignored by every existing PT proxy. If it's a critical for tor to know
 whether the variable is being honored, then, there could be an
 acknowledgement message along the lines of `PROXY OK`.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.2
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor19
-+-

Comment (by ahf):

 I don't think it's needed for us to receive an acknowledgement from the PT
 that it will honor it. In the ideal world PT's would be sandboxed somehow
 where we could easily spot if they don't honor it, but we are not there
 yet.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.2
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor19
-+-
Changes (by teor):

 * status:  needs_review => needs_revision


Comment:

 There's only one env var for bind addresses. But the Tor configuration
 allows an IPv4 and an IPv6 bind address. If a pluggable transport makes
 both IPv4 and IPv6 connections, it will need both addresses. I suggest we
 create two variables, _V4 and _V6.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.2
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor19
-+-

Comment (by ahf):

 Good point, Teor. The current design only allows you to specify either an
 IPv4 address or an IPv6 address.

 I'll revise the spec change to V4/V6 variants of the variable. Thanks!

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.25
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor19
-+-
Changes (by ahf):

 * status:  needs_revision => needs_review
 * actualpoints:  0.2 => 0.25


Comment:

 Split the variable into a _V4 and a _V6 version in
 https://github.com/ahf/torspec/commit/926d09f629d7feada285d65b3debf6145ac25d62

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.25
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor19
-+-

Comment (by teor):

 Just one grammar nitpick: "IPv6 loopback address". I made a comment on the
 commit.

 Otherwise it looks good to me.
 Thanks for using documentation IP address ranges!

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.25
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor19
-+-

Comment (by ahf):

 Good catch. Added
 https://github.com/ahf/torspec/commit/479046e9e7f3a69bcaa5f0518032b904c5185361

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  merge_ready
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor- |  Actual Points:  0.25
  change,sponsor19-can   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor19
-+-
Changes (by phw):

 * status:  needs_review => merge_ready


Comment:

 Looks good, thanks ahf.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  ahf
 Type:  defect   | Status:
 |  assigned
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap-july   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by teor):

 * status:  needs_revision => assigned
 * owner:  (none) => ahf


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap-july   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by teor):

 * status:  merge_ready => needs_revision
 * milestone:   => Tor: 0.4.3.x-final


Comment:

 Sorry, we didn't look at this ticket until now, because it wasn't in a Tor
 milestone.

 Replying to [comment:29 ahf]:
 > Added implementation for Tor in
 https://github.com/torproject/tor/pull/1164
 >
 > This implementation should reflect the spec changes that have already
 been reviewed by phw and teor in
 https://github.com/ahf/torspec/compare/bugs/5304

 Here's what we still need to do:
 * resolve conflicts with the current tor master
 * revise the patch based on the review at:
 https://github.com/torproject/tor/pull/1164#pullrequestreview-257045293
 * wait for tor's CI to finish
 * review the changes since "Expose TOR_PT_OUTBOUND_BIND_ADDRESS..."
 * squash if needed
 * merge

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  ahf
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap-july   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by teor):

 * status:  assigned => needs_revision


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  ahf
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap-july network-team- |
  roadmap-2020Q1 |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by gaba):

 * keywords:  needs-spec-change needs-tor-change, anti-censorship-roadmap-
 july =>
 needs-spec-change needs-tor-change, anti-censorship-roadmap-july
 network-team-roadmap-2020Q1


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  ahf
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  network-team-roadmap-2020Q1|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by phw):

 * keywords:
 needs-spec-change needs-tor-change, anti-censorship-roadmap-july
 network-team-roadmap-2020Q1
 => needs-spec-change needs-tor-change, network-team-roadmap-2020Q1


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  ahf
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  network-team-roadmap-2020Q1, 043-should|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by ahf):

 * keywords:  needs-spec-change needs-tor-change, network-team-roadmap-
 2020Q1 =>
 needs-spec-change needs-tor-change, network-team-roadmap-2020Q1,
 043-should


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  ahf
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  network-team-roadmap-2020Q1, 043-should|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by catalyst):

 * cc: catalyst (added)


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:
 |  catalyst
 Type:  defect   | Status:
 |  assigned
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  network-team-roadmap-2020Q1, 043-should|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by catalyst):

 * status:  needs_revision => assigned
 * owner:  ahf => catalyst


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:
 |  catalyst
 Type:  defect   | Status:
 |  assigned
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  network-team-roadmap-2020Q1, 043-should|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-

Comment (by catalyst):

 rebased torspec changes at https://github.com/torproject/torspec/pull/115

 phw, do these cover all of your previous feedback?

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:
 |  catalyst
 Type:  defect   | Status:
 |  assigned
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  network-team-roadmap-2020Q1, 043-should|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-

Comment (by catalyst):

 My rebase seems to have reverted part of
 6d03c0566568f4a56efb4aea2f32bcd86c090a22; I'll investigate whether that
 was git's fault or mine.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:
 |  catalyst
 Type:  defect   | Status:
 |  assigned
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  network-team-roadmap-2020Q1, 043-should|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-

Comment (by phw):

 Replying to [comment:45 catalyst]:
 > phw, do these cover all of your previous feedback?
 [[br]]
 Yes it does, thanks!

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:
 |  catalyst
 Type:  defect   | Status:
 |  assigned
 Priority:  Medium   |  Milestone:  Tor:
 |  0.4.3.x-final
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change, needs-tor-|  Actual Points:  1.25
  change, network-team-roadmap-2020Q1,   |
  043-should, network-team-roadmap-2020Q2|
Parent ID:  #30471   | Points:  3
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by catalyst):

 * points:  1 => 3


Comment:

 Bumping estimate, because this might need some additional unit tests.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  merge_ready
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  0.25
  anti-censorship-roadmap|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by gaba):

 * keywords:  needs-spec-change needs-tor-change,sponsor19-can => needs-
 spec-change needs-tor-change, anti-censorship-roadmap


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by ahf):

 * status:  merge_ready => needs_review
 * actualpoints:  0.25 => 1.25


Comment:

 Added implementation for Tor in
 https://github.com/torproject/tor/pull/1164

 This implementation should reflect the spec changes that have already been
 reviewed by phw and teor in
 https://github.com/ahf/torspec/compare/bugs/5304

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-

Comment (by dcf):

 It seems like `TOR_PT_OUTBOUND_BIND_ADDRESS_V*` should not be a single
 address, but should be tied to specific transport names, just like
 `TOR_PT_SERVER_BINDADDR` is. Otherwise there's no way to use different
 outbound addresses for different outbound transports, or set an outbound
 address for only one transport and let the other use the default.

 It would be good for implementation to reuse the `TOR_PT_SERVER_BINDADDR`
 syntax. Something like:
 {{{
 TOR_PT_OUTBOUND_BIND_ADDRESS_V4=obfs4-0.0.0.0:5000
 }}}

 Remember that tor can run multiple transport plugins, and a transport
 plugin can run multiple transports. The PT spec already has the bug that
 you cannot run multiple instances of the same named transport with
 different options (because options are keyed by transport name); so it
 would be good to avoid making the problem worse with options that can only
 be specified globally.

 

 An alternative to extending the PT spec is to use per-connection arguments
 (on the client side), or SMETHOD ARGS: (on the server side). After all,
 the notion of a "port" or an "outbound address" only applies to a subset
 of notional transports. This could be something to be handled at the level
 of the individual transport implementation, not globally at the level of
 the PT spec.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-

Comment (by teor):

 I did a review on the code, it looks good, but there's some code
 duplication we could avoid.

 Replying to [comment:30 dcf]:
 > It seems like `TOR_PT_OUTBOUND_BIND_ADDRESS_V*` should not be a single
 address, but should be tied to specific transport names, just like
 `TOR_PT_SERVER_BINDADDR` is. Otherwise there's no way to use different
 outbound addresses for different outbound transports, or set an outbound
 address for only one transport and let the other use the default.
 >
 > It would be good for implementation to reuse the
 `TOR_PT_SERVER_BINDADDR` syntax. Something like:
 > {{{
 > TOR_PT_OUTBOUND_BIND_ADDRESS_V4=obfs4-0.0.0.0:5000
 > }}}

 Tor doesn't support binding to outbound port, and neither does a lot of
 other software, because it's error-prone.
 Best to let the OS assign the port.

 As for using different IP addresses for each transport, sure, why not?

 > Remember that tor can run multiple transport plugins, and a transport
 plugin can run multiple transports. The PT spec already has the bug that
 you cannot run multiple instances of the same named transport with
 different options (because options are keyed by transport name); so it
 would be good to avoid making the problem worse with options that can only
 be specified globally.
 >
 > 
 >
 > An alternative to extending the PT spec is to use per-connection
 arguments (on the client side), or SMETHOD ARGS: (on the server side).
 After all, the notion of a "port" or an "outbound address" only applies to
 a subset of notional transports.

 But outbound addresses are used by any transport that makes a TCP or UDP
 connection to a non-loopback address.
 Can you give an example of a transport that doesn't make these types of
 connections?

 (I can think of transports that use Unix domain sockets, but I'm not aware
 of any in production. And I'd expect there would be an IP connections
 somewhere along the way.)

 > This could be something to be handled at the level of the individual
 transport implementation, not globally at the level of the PT spec.

 The advantage of having it in the spec is that it's standardised.
 The advantage of using environmental variables is that the user can set
 them, even if the tor version doesn't support them.
 Env vars are particularly important for other apps that don't implement
 the latest spec.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-

Comment (by teor):

 > As for using different IP addresses for each transport, sure, why not?

 But since the user can only set one value for each environmental variable,
 we should treat an unqualified address as applying to every transport that
 isn't named.

 So we would end up with something like:

 TOR_PT_OUTBOUND_BIND_ADDRESS_V4=obfs4-0.0.0.0,snowflake-203.0.113.4,203.0.113.2

 I'm not sure if we need this level of complexity in our implementation?
 We could put transport-qualified addresses in the spec, but avoid
 implementing them until we actually have some demand for them.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-

Comment (by ahf):

 Replying to [comment:32 teor]:
 > But since the user can only set one value for each environmental
 variable, we should treat an unqualified address as applying to every
 transport that isn't named.
 >
 > So we would end up with something like:
 >
 >
 TOR_PT_OUTBOUND_BIND_ADDRESS_V4=obfs4-0.0.0.0,snowflake-203.0.113.4,203.0.113.2
 >
 > I'm not sure if we need this level of complexity in our implementation?
 > We could put transport-qualified addresses in the spec, but avoid
 implementing them until we actually have some demand for them.

 I also don't see much sense in implementing this additional complexity and
 this was considered when the spec change was proposed.

 For Tor clients I cannot think of any use case where you want to have
 multiple different source addresses for different transports since most
 people will have up to two different IP's, at max, per family
 (wifi/ethernet, whonix internal/external IP in Qubes, internal/external
 interface on a router).

 For Tor bridges: I think everybody who wants to run multiple transports
 would be much better off running multiple instances of Tor itself with a
 single transport enabled given that they then get access to statistics and
 other useful information on how their bridge is doing. Or what am I
 missing here?

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap|
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-

Comment (by dcf):

 Replying to [comment:31 teor]:
 > Tor doesn't support binding to outbound port, and neither does a lot of
 other software, because it's error-prone.
 > Best to let the OS assign the port.

 I'm sorry, I misunderstood what this was about, especially regarding
 address versus port. I should not have commented.

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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap-july   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by gaba):

 * keywords:  needs-spec-change needs-tor-change, anti-censorship-roadmap =>
 needs-spec-change needs-tor-change, anti-censorship-roadmap-july


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Re: [tor-bugs] #5304 [Circumvention/Obfs4]: Obfsproxy should respect OutboundBindAddress in torrc

[Tor Bug Tracker & Wiki]

#5304: Obfsproxy should respect OutboundBindAddress in torrc
-+-
 Reporter:  korobkov |  Owner:  (none)
 Type:  defect   | Status:
 |  merge_ready
 Priority:  Medium   |  Milestone:
Component:  Circumvention/Obfs4  |Version:
 Severity:  Normal   | Resolution:
 Keywords:  needs-spec-change needs-tor-change,  |  Actual Points:  1.25
  anti-censorship-roadmap-july   |
Parent ID:  #30471   | Points:  1
 Reviewer:  phw  |Sponsor:
 |  Sponsor28-must
-+-
Changes (by phw):

 * status:  needs_review => merge_ready


Comment:

 It looks like we're done here, right?

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