[tor-bugs] #25866 [Core Tor/Stem]: does DescriptorDownloader.get_server_descriptors() get non-consensus descriptors?

[Tor Bug Tracker & Wiki]

#25866: does DescriptorDownloader.get_server_descriptors() get non-consensus
descriptors?
---+
 Reporter:  cypherpunks|  Owner:  atagar
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:
Component:  Core Tor/Stem  |Version:
 Severity:  Normal |   Keywords:
Actual Points: |  Parent ID:
   Points: |   Reviewer:
  Sponsor: |
---+
 bad-relays@ runs a stem script that fetches all descriptors from the
 current consensus via
 
https://stem.torproject.org/api/descriptor/remote.html#stem.descriptor.remote.DescriptorDownloader.get_server_descriptors


 "If no fingerprints are provided then this returns all descriptors in the
 present consensus."

 On 2018-04-20 it generated an output about relay
 9925389058263BB54D4AE2319DBCD3087393EB24

 I was unable to find any consensus from 2018-04-20 with this relay in it.

 Only moria1 and dizum seem to vote about it.

 Does .get_server_descriptors() also fetch descriptors not in consensus?

 {{{
 @type server-descriptor 1.0
 router Lesearch2017 223.197.177.49 9090 0 9030
 platform Tor 0.2.6.0-alpha-dev on Linux
 protocols Link 1 2 Circuit 1
 published 2018-04-20 08:26:03
 fingerprint 9925 3890 5826 3BB5 4D4A E231 9DBC D308 7393 EB24
 uptime 13165920
 bandwidth 10485760 20971520 53832
 extra-info-digest 820073CDA736DF930C03D4EA7B82FC8C43645EA7
 onion-key
 -BEGIN RSA PUBLIC KEY-
 MIGJAoGBANuX97BAzqakkQs1pflUljFEZwO+2yLv1TbE40sgfHnATzh5RLFw7Paf
 h6y6wpWb/GYkn2BD2eLzToF/kKmaApIej0ePrIRi0XBwUBajoij+Ga+YdSQrSBOg
 1WiVg+TDJM8Fkfu0UmL8ZcceztddeV+yTMRAEbdV5SAGuzY98uWDAgMBAAE=
 -END RSA PUBLIC KEY-
 signing-key
 -BEGIN RSA PUBLIC KEY-
 MIGJAoGBANxawKDc8HTF9OEqRYQURtgdKP3OIpzufcHb4WUJUdP0IbpTwAfXguuy
 xU7Xe3LmLZo9bqghoigZlbYGX8iLorIshJ0BvDNXErYv0hpqGSxrAnckwoGhgiit
 Ky8oEVugV4KymqeH6gK+itMrUZm/3JvFoACrbe8f3UsxMoEMwRJ3AgMBo7M=
 -END RSA PUBLIC KEY-
 hidden-service-dir
 ntor-onion-key hXVaWAq8PRgiKdIOxhRAgKZ6ECIhYsAsgsHFmxhQCEk=
 reject *:*
 router-signature
 -BEGIN SIGNATURE-
 Mi/lWn+p3xWllJxy3y558WuHyRNUlmtyJ4vnUvZhogQVjETNO1/t70keNDL+1JVW
 Ap5BW6rfZH5ZEI0OJoif+W/8hiWvJpf/Mkn07XbNJMZbr6BsKyfcGZy/SHd6iKK9
 yly/p5GVtQQO2SpgLpEXWB0Tu2cElUsOX7bCQz1LUow=
 -END SIGNATURE-
 }}}

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Re: [tor-bugs] #25866 [Core Tor/Stem]: does DescriptorDownloader.get_server_descriptors() get non-consensus descriptors?

[Tor Bug Tracker & Wiki]

#25866: does DescriptorDownloader.get_server_descriptors() get non-consensus
descriptors?
---+
 Reporter:  cypherpunks|  Owner:  atagar
 Type:  defect | Status:  closed
 Priority:  Medium |  Milestone:
Component:  Core Tor/Stem  |Version:
 Severity:  Normal | Resolution:  fixed
 Keywords: |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:
---+
Changes (by atagar):

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


Comment:

 Hi cypherpunks, good point. Pushed a small doc fix...

 https://gitweb.torproject.org/stem.git/commit/?id=27b2cbd

 Unfortunately the spec is a bit vague about what server descriptors will
 be available but you're right that it's not necessarily what is in the
 consensus. Feel free to reopen with the 'Core Tor / Tor' component if
 you'd like more clarity about what relays will and won't be available in
 the response.

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Re: [tor-bugs] #25866 [Core Tor/Stem]: does DescriptorDownloader.get_server_descriptors() get non-consensus descriptors?

[Tor Bug Tracker & Wiki]

#25866: does DescriptorDownloader.get_server_descriptors() get non-consensus
descriptors?
---+
 Reporter:  cypherpunks|  Owner:  atagar
 Type:  defect | Status:  closed
 Priority:  Medium |  Milestone:
Component:  Core Tor/Stem  |Version:
 Severity:  Normal | Resolution:  fixed
 Keywords: |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:
---+

Comment (by teor):

 This is how Tor works in detail:
 Relays try to fetch all descriptors for every consensus they successfully
 download and validate.
 Relays cache all descriptors they have ever successfully downloaded.
 Relays remove a descriptor from their cache when it expires.

 So the number of descriptors returned by a relay depends on its uptime.

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Re: [tor-bugs] #25866 [Core Tor/Stem]: does DescriptorDownloader.get_server_descriptors() get non-consensus descriptors?

[Tor Bug Tracker & Wiki]

#25866: does DescriptorDownloader.get_server_descriptors() get non-consensus
descriptors?
---+
 Reporter:  cypherpunks|  Owner:  atagar
 Type:  defect | Status:  closed
 Priority:  Medium |  Milestone:
Component:  Core Tor/Stem  |Version:
 Severity:  Normal | Resolution:  fixed
 Keywords: |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:
---+

Comment (by cypherpunks):

 in this example the script directly connects to dir auths I guess.

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Re: [tor-bugs] #25866 [Core Tor/Stem]: does DescriptorDownloader.get_server_descriptors() get non-consensus descriptors?

[Tor Bug Tracker & Wiki]

#25866: does DescriptorDownloader.get_server_descriptors() get non-consensus
descriptors?
---+
 Reporter:  cypherpunks|  Owner:  atagar
 Type:  defect | Status:  closed
 Priority:  Medium |  Milestone:
Component:  Core Tor/Stem  |Version:
 Severity:  Normal | Resolution:  fixed
 Keywords: |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:
---+

Comment (by cypherpunks):

 and thanks for the fast documentation fix

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Re: [tor-bugs] #25866 [Core Tor/Stem]: does DescriptorDownloader.get_server_descriptors() get non-consensus descriptors?

[Tor Bug Tracker & Wiki]

#25866: does DescriptorDownloader.get_server_descriptors() get non-consensus
descriptors?
---+
 Reporter:  cypherpunks|  Owner:  atagar
 Type:  defect | Status:  closed
 Priority:  Medium |  Milestone:
Component:  Core Tor/Stem  |Version:
 Severity:  Normal | Resolution:  fixed
 Keywords: |  Actual Points:
Parent ID: | Points:
 Reviewer: |Sponsor:
---+

Comment (by teor):

 I think recent versions of stem use fallbacks by default for descriptor
 fetches.

 Anyway, here is the authority behaviour:
 Authorities cache any descriptors posted to them by relays
 Authorities try to fetch all descriptors for every vote and consensus they
 successfully download and validate.
 Authorities cache all descriptors they have ever successfully downloaded.
 Authorities remove a descriptor from their cache when it expires, or for
 miscordescs, when it hasn't been mentioned in a recent consensus.

 So the number of descriptors returned by an authority depends on its
 reachability and uptime.

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