[Bug 2117730] Re: Enable (opportunistic) DNSSEC

[Nick Rosbrook]

** Also affects: livecd-rootfs (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: livecd-rootfs (Ubuntu)

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Title:
  Enable (opportunistic) DNSSEC

Status in bind9 package in Ubuntu:
  New
Status in dnsmasq package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  Fix Committed

Bug description:
  DNSSEC is an established DNS extension that allows to
  cryptographically sign & validate DNS records. It can be enabled in
  “auto” (fallback) mode, which does not enforce signed records, but
  uses them whenever possible. We should enable that “fallback” mode by
  default in Ubuntu and provide means to enforce DNSSEC, too.

  It is currently turned off by default in systemd-resolved (in Debian &
  Ubuntu), due to “compatibility issues with certain network access
  points”:

  * https://salsa.debian.org/systemd-team/systemd/-/commit/e99d4d7c1f8fba6ea197c6dd7ecf6c7f0e8ac894
  * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=959996

  While upstream systemd recommends the usage of `default-dnssec=allow-
  downgrade`.

  Some specific issues observed in the past:
  - bug #1628778
  - bug #1682499
  - bug #1690605
  - bug #1857639

  Due to issues like the ones mentioned above, we should provide an easy
  way to disable DNSSEC, therefore I think shipping drop-in configs for
  systemd-resolved to set "[Resolve] DNSSEC=allow-downgrade" via a
  Recommends "systemd-resolved-dnssec" package and (optionally) set
  "[Resolve] DNSSEC=yes" manually in a drop-in config in
  /etc/systemd/resolved.conf.d/10-dnssec.conf. No need to modify the
  "-Ddefault-dnssec==no" build flags. That way the "systemd-resolved-
  dnssec" package could be removed to downgrade to "DNSSEC=no" in case
  of issues:

  $ apt remove systemd-resolved-dnssec

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