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

[Anders Kaseorg]

Filed https://github.com/systemd/systemd/issues/4157 upstream for the
NOTFOUND vs. UNAVAIL problem.

** Bug watch added: github.com/systemd/systemd/issues #4157
   https://github.com/systemd/systemd/issues/4157

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

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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