Public bug reported:
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.
The following syntax would preserve the fallback in the case that
systemd-resolved is not running at all, but allow systemd-resolved to
fail lookups that should fail when it is running:
hosts: files resolve [!TRYAGAIN=return] dns
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1624071
Title:
libnss-resolve: Fallback from resolve to dns breaks DNSSEC validation
Status in systemd package in Ubuntu:
New
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.
The following syntax would preserve the fallback in the case that
systemd-resolved is not running at all, but allow systemd-resolved to
fail lookups that should fail when it is running:
hosts: files resolve [!TRYAGAIN=return] dns
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