Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
Mark Andrews <marka@isc.org> Mon, 10 May 2021 22:14 UTC
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From: Mark Andrews <marka@isc.org>
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Date: Tue, 11 May 2021 08:13:58 +1000
Cc: Joe Abley <jabley@hopcount.ca>, dnsop <dnsop@ietf.org>, Pieter Lexis <pieter.lexis@powerdns.com>
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To: Ben Schwartz <bemasc=40google.com@dmarc.ietf.org>
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Subject: Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-svcb-https-05.txt
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> On 11 May 2021, at 02:56, Ben Schwartz <bemasc=40google.com@dmarc.ietf.org> wrote: > > I don't support breaking the SvcParams into separate RRs across the RRSet. This would be an extremely inefficient encoding in wire format, and would conflict with the usual understanding of resource records as independently meaningful alternatives. It would also require a dramatic rewrite of a specification that is now widely deployed. > > As for the question of commas, I continue to believe that the current text is preferable. I believe that the behavior Dick is advocating for is in fact the one that was present in the draft until -02 [1], changed here [2]. We changed this text after receiving complaints from WG members that the algorithm as specified was too complicated, along with my own experiences attempting to implement it in multiple codebases that apply char-string decoding during or before tokenization. > > The key question is: how is the zone file parsing supposed to work? I see two main options: > > One-pass (draft-02): > 1. Read the key name up to an "=" > 2. Load a parser whose behavior depends on the key name > 3. Feed this parser characters from the zone file until it declares completion or error > > Two-pass (more recent drafts): > 1. Read the key name up to an "=" > 2. Parse the value as a char-string > 3. Pass the char-string parser output to the a key-specific parser for deeper processing > > In one-pass parsing, comma-separated value (CSV) lists are like dot-separated domain names: first-class entities whose delimiter escaping is fully integrated into the parsing. In two-pass parsing, CSV format is an implementation detail of particular SvcParam registrations, encoded as data inside plain char-strings in the zone file. > > To see why I favor two-pass, consider a SvcParam whose wire format value is defined to be CBOR, represented as JSON in the zone file. JSON is defined as UTF-16, and allows strings containing any character from the Basic Multilingual Plane. It also allows various kinds of backslash escaping including " \" " for quotes within strings, and "\uD834\uDD1E" for extended unicode codepoints. A one-pass parser must somehow integrate this into the flow of zone file parsing. The easiest way is to simply disable all RFC1035-style escapes and line-breaks for the duration of the SvcParamValue, but this is a major breach of standard zone file practice, and raises questions about how to store UTF-16 characters in a zone file. Alternatively, we could somehow combine both RFC1035 and JSON escaping, but if this is even possible, it would seem to require writing a new RFC1035+JSON hybrid parser. I also think these behaviors would be confusing to users, who would have to try to understand how this new integrated escaping works in order to author zone files containing either kind of escape. Yet you fail to mention that the following 3. Encoding JSON text SHALL be encoded in Unicode. The default encoding is UTF-8. The UTF-16 JSON strings values are encoded as UTF-8. UTF-8 in zone files usually ends up being \DDD for non-ASCII and ASCII control octets once it has gone from text -> wire -> text to put everything into ASCII printable. Zone files are ASCII documents. If you are using the values in other contexts you may convert the wire forms differently. > In two-pass parsing, this is trivial. One simply parses the value as a char-string, and feeds the output to a JSON parser. The resulting double-escaping may be unattractive, but is commonplace when working with structured data inside a string. > > Another point in favor of two-pass parsing: it makes unknown keys "value errors" instead of "syntax errors". In one-pass parsing, when the parser encounters an unrecognized SvcParamKey, it must stop and fail immediately. It cannot proceed, because it cannot even continue tokenizing. > > [1] https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-svcb-https-02#appendix-A.1 > [2] https://github.com/MikeBishop/dns-alt-svc/pull/282 > > > On Mon, May 10, 2021 at 8:35 AM Joe Abley <jabley@hopcount.ca> wrote: > Hi Pieter, > > On 10 May 2021, at 11:23, Pieter Lexis <pieter.lexis@powerdns.com> wrote: > >> You then invite the following issues: >> >> Clients need to match the tuple (ownername + prio + target) and get all >> data from all matched rrsets, whereas now you get all that data in one >> piece of rdata. > > Inviting that issue is also a potential benefit, but I agree that the implication exists. For example, the ability to publish sets of SvcParams with long TTLs ought to increase the probability of cache hits for that data and reduce SVCB response sizes. > >> A client also can't figure out (if not doing DNSSEC valdiation >> themselves) if you have received all the SVC data for a certain name. > > A client can't figure out without DNSSEC whether anything they have received is correct in, in general. So setting aside that more general authentication problem, I don't think it's correct to say that a client cannot tell whether they have received a complete RRSet in the answer section of a response. It's either there and complete or it's absent (and perhaps TC=1 if the reason for its absence is message truncation). > > There should be no response possible in an implementation that adheres to the protocol in which a truncated RRSet appears in the answer section. If we're widening the net to implementations that don't follow the rules then I agree anything is possible. > > > Joe > _______________________________________________ > DNSOP mailing list > DNSOP@ietf.org > https://www.ietf.org/mailman/listinfo/dnsop > _______________________________________________ > DNSOP mailing list > DNSOP@ietf.org > https://www.ietf.org/mailman/listinfo/dnsop -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org
- [DNSOP] I-D Action: draft-ietf-dnsop-svcb-https-0… internet-drafts
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Petr Špaček
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Ben Schwartz
- Re: [DNSOP] I-D Action: draft-ietf-dnsop-svcb-htt… Wellington, Brian
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tom
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Pieter Lexis
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Peter van Dijk
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Stephen Farrell
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- [DNSOP] ZONEMD was Re: [Ext] I-D Action: draft-ie… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… libor.peltan
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Vladimír Čunát
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] ZONEMD was Re: [Ext] I-D Action: draf… Wessels, Duane
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… libor.peltan
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] ZONEMD was Re: [Ext] I-D Action: draf… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Peter van Dijk
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Joe Abley
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John R Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… libor.peltan
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John R Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John R Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… John Levine
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tommy Pauly
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tommy Pauly
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tommy Pauly
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Erik Nygren
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Martin Thomson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Martin Thomson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Wouters
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Martin Thomson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Mark Andrews
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ralf Weber
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Eric Orth
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ralf Weber
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Tim Wicinski
- [DNSOP] Sub-field encoding scheme discussion (pos… Brian Dickson
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Paul Hoffman
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ralf Weber
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Dick Franks
- Re: [DNSOP] [Ext] I-D Action: draft-ietf-dnsop-sv… Ben Schwartz