Re: [tor-bugs] #25768 [Core Tor/DocTor]: doctor should check for clock skew on dir auths

[Tor Bug Tracker & Wiki]

#25768: doctor should check for clock skew on dir auths
-+-
 Reporter:  arma |  Owner:  atagar
 Type:  enhancement  | Status:  closed
 Priority:  Medium   |  Milestone:
Component:  Core Tor/DocTor  |Version:
 Severity:  Normal   | Resolution:  implemented
 Keywords:   |  Actual Points:
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+-
Changes (by atagar):

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


Comment:

 Good idea, Roger. Pushed a little Stem change to surface response
 headers...

 
https://gitweb.torproject.org/stem.git/commit/?id=187d37661f06ed0db754d43f299be68ce1e78f7b

 ... and added a notification when clocks are off by at least ten
 seconds...

 
https://gitweb.torproject.org/doctor.git/commit/?id=5399092235e6d1f74841347b01adddaf9df63d3a

 Presently this is generating notices for dizum...

 {{{
 maatuska: 0.406214 seconds
 tor26: 0.03344 seconds
 Bifroest: 0.369906 seconds
 longclaw: 0.779489 seconds
 dizum: 68.061756 seconds
 bastet: 0.290902 seconds
 gabelmoo: 0.348548 seconds
 moria1: 0.801659 seconds
 dannenberg: 0.002416 seconds
 Faravahar: 0.411186 seconds
 }}}

 > Also note that I filed nearly the same ticket for consensus-health in
 #25767 -- I wonder if there is some better way to handle overlapping
 functionality in the future.

 Consensus-health provides a dashboard whereas DocTor is a notification
 framework. In this case I think DocTor is a better fit since there's
 really not much to visualize. But if having a website that displays clock
 deltas of all the authorities would be helpful then Tom can copy what I
 did in DocTor. It's not much code.

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Re: [tor-bugs] #25768 [Core Tor/DocTor]: doctor should check for clock skew on dir auths

[Tor Bug Tracker & Wiki]

#25768: doctor should check for clock skew on dir auths
-+
 Reporter:  arma |  Owner:  atagar
 Type:  enhancement  | Status:  new
 Priority:  Medium   |  Milestone:
Component:  Core Tor/DocTor  |Version:
 Severity:  Normal   | Resolution:
 Keywords:   |  Actual Points:
Parent ID:   | Points:
 Reviewer:   |Sponsor:
-+

Comment (by arma):

 Also note that I filed nearly the same ticket for consensus-health in
 #25767 -- I wonder if there is some better way to handle overlapping
 functionality in the future.

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[tor-bugs] #25768 [Core Tor/DocTor]: doctor should check for clock skew on dir auths

[Tor Bug Tracker & Wiki]

#25768: doctor should check for clock skew on dir auths
-+
 Reporter:  arma |  Owner:  atagar
 Type:  enhancement  | Status:  new
 Priority:  Medium   |  Milestone:
Component:  Core Tor/DocTor  |Version:
 Severity:  Normal   |   Keywords:
Actual Points:   |  Parent ID:
   Points:   |   Reviewer:
  Sponsor:   |
-+
 In #25756 we discovered that it can actually produce a user-visible
 complaint when dizum has its clock wrong by 65 seconds.

 Specifically, when the combination of skew from the dir auth and from the
 relay doing the fetch sum to more than 60 seconds, then if the relay
 decides to update its consensus at just the right time, the relay will get
 a warn message.

 It would be great if doctor checked the Date: header on dir auth
 responses, and did something smart if it's not right enough.

 Note that the Date header gets chosen when the dir auth begins to respond
 to the request, so if it takes 25 seconds to finish downloading the
 request, you shouldn't decide that the Date was wrong by 25 seconds.

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