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Include in manual what DNSSEC=no means in detail

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https://www.rfc-editor.org/rfc/rfc4035.html#section-3.2.1 says
security-aware recursive name server MUST set DO bit when sending
requests. systemd-resolved does not do that by design. State it more
clearly in manual page. Unlike other implementations it disables not
only validation as it stated, but complete DNSSEC awareness.

Signed-off-by: Petr Menšík <pemensik@redhat.com>
This commit is contained in:
Petr Menšík 2023-07-15 04:11:25 +02:00 committed by Zbigniew Jędrzejewski-Szmek
parent c46f5680ca
commit 96d384ca4f
1 changed files with 3 additions and 1 deletions
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4
man/resolved.conf.xml
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@ -152,7 +152,9 @@
"downgrade" attacks, where an attacker might be able to
trigger a downgrade to non-DNSSEC mode by synthesizing a DNS
response that suggests DNSSEC was not supported. If set to
false, DNS lookups are not DNSSEC validated.</para>
false, DNS lookups are not DNSSEC validated and the resolver
becomes security-unaware. All forwarded queries have DNSSEC OK (DO)
bit unset.</para>
<para>Note that DNSSEC validation requires retrieval of
additional DNS data, and thus results in a small DNS look-up