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

[Adrien Nader]

Unfortunately, TLS libraries are large beasts and even patch updates
often introduce small behaviour changes which rules them out for
backports. Major releases are basically guaranteed to contain such
behaviour changes and are therefore impossible to backport sadly.

** Changed in: gnutls28 (Ubuntu)
       Status: New => Won't Fix

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

Status in gnutls28 package in Ubuntu:
  Won't Fix

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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