[Bug 1851427] Re: Consider updating GNUTLS for TLSv1.3 and unified config w/Focal

[Dimitri John Ledkov]

Bionic at point-zero shipped with two OpenSSL series the legacy 1.0.2
and non-lts 1.1.0. We made the call that 1.1.0 series is unsupportable
over the 10 years, and thus chose (as one time only event) upgrade to
1.1.1 series. It was primarily driven by supportability and maintenance
concern.

Note, many applications in bionic, despite using 1.1.1 series do not
support TLSv1.3. And many use 1.02.

We do not currently have supportability concerns of the GnuTLS 3.5 in
bionic over the bionic lifespan. Thus the same premise as to why we went
through the painful process of OpenSSL backport do not stand.

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https://bugs.launchpad.net/bugs/1851427

Title:
  Consider updating GNUTLS for TLSv1.3 and unified config w/Focal

Status in gnutls28 package in Ubuntu:
  New

Bug description:
  Bionic uses GNUTLS 3.5, and many programs embed its functionality
  (like Samba). The OpenSSL library in Bionic was backported to support
  TLSv1.3, but many packages using GNUTLS 3.5 are using an older branch
  (the stable branch of GNUTLS is now 3.6).

  There are some advantages to the latest GNUTLS, such as TLSv1.3
  support, optimizations and fixes, and also centralized management of
  cipher profile strings, which will let SYSADMINs and MSPs easily
  template cipher changes across the board between Bionic and Focal
  systems.

  Would it be possible to backport GNUTLS to Bionic the same way that
  OpenSSL was? It would be nice to have both major encryption libraries
  on the current branch through a release's supported life.

  Further reading:
  https://gnutls.org/news.html
  https://nikmav.blogspot.com/2018/05/gnutls-and-tls-13.html

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