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Re: [tor-bugs] #31823 [Core Tor/Stem]: HSv3 descriptor support in stem [encoding]

#31823: HSv3 descriptor support in stem [encoding]
-------------------------------------------------+-------------------------
 Reporter:  asn                                  |          Owner:  atagar
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Stem                        |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs scaling onionbalance          |  Actual Points:  2
  network-team-roadmap-september tor-spec        |
Parent ID:  #26768                               |         Points:  5
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by atagar):

 * status:  needs_revision => needs_information


Comment:

 Thanks asn! Finally got my openssl bindings working.
 [https://gitweb.torproject.org/stem.git/commit/?id=440cb9b Fixed python3
 support].

 > Hm. These fields are not actually optional. They are actually requred by
 rend-spec-v3.txt for the descriptor to be parseable.

 Good point. Fixed.

 > There is an str/bytes issue with Python3.7.5 here, where stem will
 actually produce a descriptor that says:
 > enc-key ntor b'sCII8wNTkbwaIReqUWR86TCR==' here.

 Another good point. Fixed.

 > One of the goals of my old _get_middle_descriptor_layer_body() function
 here was to make the output of stem indistinguishable from the output of
 Tor.

 Sorry, I'm not quite understanding this. The _descriptor_content()
 arguments are simply default values for mandatory fields - if a caller
 would care to provide their own desc-auth-ephemeral-key (rather than use a
 default value) they simply need to provide it...

 {{{
 % cat demo.py
 from stem.descriptor.hidden_service import HiddenServiceDescriptorV3,
 InnerLayer, IntroductionPointV3

 print(HiddenServiceDescriptorV3.content({'desc-auth-ephemeral-key': 'I
 want a pony...'}))

 % python demo.py
 hs-descriptor 3
 descriptor-lifetime 180
 descriptor-signing-key-cert
 -----BEGIN ED25519 CERT-----
 AQgABqxVAT0aH48dgIhVpHORH/KnytuFmK+lU3I7LLDs0gKosTXqAQAgBABhYWFh
 YWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWFhYWJiYmJiYmJiYmJiYmJiYmJiYmJi
 YmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmJiYmI=
 -----END ED25519 CERT-----
 revision-counter 1574205680
 superencrypted
 -----BEGIN MESSAGE-----
 54+p38IDSEm0ZaOPB4WpTXvAPOt2M9tLeDclSQNJ2PXPhVzsxG3YhO8M4fyQjySm
 MiVDypHcDJPEeKDAkG2rq22Iwn2TPNCpcggDDLueOMHxMmWSnbqnkWsIU1nEgQKx
 41rI11LrU0JtJ1jRUGeYITxPn+62LZ5vAKFcaW86m2k8snSI0jA0+gpreEllMI1F
 fZPRIMlT+lcs8qi1oIh1GxD3dlOiqj1bliEYF9ZD1EL4xXCg2WjZ0UOPA6PTbL/y
 cfuAg+5bOIeIVwZEuWYtAbWQjQncL3or42JflExvSqfRhtRdWT5bnGGS4SWxcn0A
 NJTfJTk4HOatA4fz0x4wn6PsAoel+gCcsWdGV66zo0jhjJwPgkfkMl724GtL/zqF
 cwSPV6zC1gunnZ9IOiYIfAG5l2cKxtwErlAQYuAh+6eGR924AgaX9K+a9Hg/nv3r
 9nmvx4+hMhiV9vAjr+W1vBcMb0ScAfJO2XfFHjDJZJLntcYdqaaUsGy/p7MpgO1b
 8CKcdx5Fftq2Sr/2QKLFs76o7+uIQfbF8dGDc5wq+m5nizo4FG8Ysedgvblvzx1w
 771i3MW4f/jI3DmR7Ib4W3F7v96oMBS2jotUhYSAhk8niIQPwe5eYucCPsOqPRZh
 n7Tvgi3q8HKgFhaL0OEg2z9MH54P8YIYuSfQAnkTjzZNgu3VcEfgeg==
 -----END MESSAGE-----
 desc-auth-ephemeral-key I want a pony...
 signature
 sTxFMYH2iGlqzqioPY76jlq0ByyRbUBC6/coXeZ/PBSbYUNlOUtSkVwQrmkb9+scgxHgMz++qwv5A/2zZnFjCQ
 }}}

 Ball's back in your court.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31823#comment:12>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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