[tor-bugs] #24978 [Core Tor/Tor]: Tor doesn't work when built with (unreleased) OpenSSL 1.1.1 built with enable-tls1_3

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#24978: Tor doesn't work when built with (unreleased) OpenSSL 1.1.1 built with
enable-tls1_3
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     Reporter:  nickm    |      Owner:  nickm
         Type:  defect   |     Status:  assigned
     Priority:  Medium   |  Milestone:  Tor: 0.3.3.x-final
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  029-backport 031-backport
     Severity:  Normal   |  032-backport openssl
Actual Points:           |  Parent ID:
       Points:           |   Reviewer:
      Sponsor:           |
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 From https://www.openssl.org/blog/blog/2017/05/04/tlsv1.3/ :

 >If you explicitly configure your ciphersuites then care should be taken
 to ensure that you are not inadvertently excluding all TLSv1.3 compatible
 ciphersuites. If a client has TLSv1.3 enabled but no TLSv1.3 ciphersuites
 configured then it will immediately fail (even if the server does not
 support TLSv1.3) with an error message

 That's the situation we're in now.  When OpenSSL 1.1.1 releases in April,
 current Tor versions just won't work with it at all, since they have
 neither disabled TLS1.3 nor enabled any TLS1.3 ciphers.

 We have two options for fixing this: I'll implement both and we can see
 what we like.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24978>
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