[Bug 1624071] Re: libnss-resolve: Fallback from resolve to dns breaks DNSSEC validation

[Martin Pitt]

Upstream PR sent with a possible fix:
https://github.com/systemd/systemd/pull/4164

With that "resolve [!UNAVAIL=return] dns" does the right thing.

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https://bugs.launchpad.net/bugs/1624071

Title:
  libnss-resolve: Fallback from resolve to dns breaks DNSSEC validation

Status in systemd:
  Unknown
Status in systemd package in Ubuntu:
  Triaged

Bug description:
  The libnss-resolve postinst script inserts ‘resolve’ before ‘dns’ in
  the hosts line of /etc/nsswitch.conf.  This makes DNSSEC validation
  impossible, even with DNSSEC=yes in /etc/systemd/resolved.conf,
  because if libnss_resolve returns a validation failure, glibc will
  simply fall back to libnss_dns.  It also makes NXDOMAIN lookups twice
  as slow.

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