Re: [DNSOP] Updating RFC 7344 for cross-NS consistency
Bob Harold <rharolde@umich.edu> Tue, 28 June 2022 14:21 UTC
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From: Bob Harold <rharolde@umich.edu>
Date: Tue, 28 Jun 2022 10:20:47 -0400
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To: Peter Thomassen <peter@desec.io>
Cc: Paul Wouters <paul@nohats.ca>, "dnsop@ietf.org WG" <dnsop@ietf.org>
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Subject: Re: [DNSOP] Updating RFC 7344 for cross-NS consistency
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On Tue, Jun 28, 2022 at 9:52 AM Peter Thomassen <peter@desec.io> wrote: > > > On 6/28/22 02:56, Paul Wouters wrote: > >> I thus propose to update RFC 7344 along the lines of (2), such that it > is REQUIRED to retrieve CDS/CDNSKEY records using queries to all > authoritative nameservers. > > > > The question is now how to phrase this exactly. Do we want the parent to > use > > its "external" knowledge of NS records of the child - eg from its WHOIS > data? > > That would be clean and simple. > > > > Or are we okay that it queries for the NS records to get the list ? > > If so, it would need to require DNSSEC for the NS RRset, but there might > > be more than one validly signed NS RRset if these nameservers are out > > of sync. In that case, which of these is the intended one? > > The parental agent has unerring knowledge of the delegation NS records, so > I think those should be used. This is also what's done for bootstrapping, > where the child-side NS RRset is not yet trusted. > > For the reason you mentioned and for consistency with bootstrapping, I'd > suggest to choose phrasing that similar to that in the bootstrapping draft, > such as (inspired by in draft-ietf-dnsop-dnssec-bootstrapping, Section 3.2): > > Query the CDS/CDNSKEY records at the Child zone apex directlyfrom > each of the authoritative servers as determined by thedelegation's > NS record set using a trusted DNSresolver and enforce DNSSEC > validation > > or (inspired by bootstrapping Section 3.3): > > The Parental Agent MUST ascertain that queries are only made against > the proper set of nameservers as listed in the Child's delegation > from the Parent. > > Having this aligned allows CDS/CDNSKEY scanners to use the same query > logic for bootstrapping and for rollovers. > > >> Does the WG think this is a reasonable thing to pursue? > > > > I think this could be an excellent super short RFC that Updates: 7344. > > Sure, I'm volunteering to write up something. I'll wait until Thursday or > so, in case others share thoughts I should know before I start. > > Thanks, > Peter > > -- > https://desec.io/ > > But the parent NS set is not covered by DNSSEC, and thus could be spoofed?? (Wish we could fix that!) -- Bob Harold
- [DNSOP] Updating RFC 7344 for cross-NS consistency Peter Thomassen
- Re: [DNSOP] Updating RFC 7344 for cross-NS consis… Paul Wouters
- Re: [DNSOP] Updating RFC 7344 for cross-NS consis… Peter Thomassen
- Re: [DNSOP] Updating RFC 7344 for cross-NS consis… Bob Harold
- Re: [DNSOP] Updating RFC 7344 for cross-NS consis… Peter Thomassen
- Re: [DNSOP] Updating RFC 7344 for cross-NS consis… Bob Harold
- Re: [DNSOP] Updating RFC 7344 for cross-NS consis… Peter Thomassen