| Internet-Draft | Resinfo DNSSEC | September 2024 |
| Bortzmeyer | Expires 15 March 2025 | [Page] |
This document is the specification of a DNS Resolver Information Key [RFC9606] for DNSSEC validation, "dnssecval".¶
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RFC 9606 created a DNS record type RESINFO to allow resolvers to publish information about their capabilities and policies. This information is encoded as {key, value} pairs. Keys are in an IANA registry and this specification adds a new key, to indicate that the resolver validates with DNSSEC [RFC4033][RFC4034][RFC4035].¶
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.¶
The name of the key is "dnssecval", for "DNSSEC validating [resolver]". The presence of this key indicates that the DNS resolver validates all answers with DNSSEC [RFC4033] [RFC4034] [RFC4035]. Note that, per the rules for the keys defined in Section 6.4 of [RFC6763] if there is no '=' in a key, then it is a boolean attribute, simply identified as being present, with no value.¶
The resolver which announces this capability in a RESINFO record MAY add DNSSEC-specific EDE (Extended DNS Error Codes, [RFC8914]) to the value of the "exterr" key.¶
IANA is requested to add "dnssecval" and a reference to this document to the registry "DNS Resolver Information Keys".¶
DNSSEC is a very important tool for the security of the DNS and therefore it is important for users to know in advance if the resolver they consider supports DNSSEC or not. It would be better to assume that every resolver validates (thus rendering this document useless) but it is not the case today.¶
As with any information published in the DNS, the key in the RESINFO may be wrong or outdated. They should be regarded with care.¶
My cat did nothing to help.¶