Re: [TLS] draft-ietf-tls-esni feedback
Rob Sayre <sayrer@gmail.com> Mon, 21 October 2019 14:32 UTC
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From: Rob Sayre <sayrer@gmail.com>
Date: Mon, 21 Oct 2019 07:32:11 -0700
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To: Eric Rescorla <ekr@rtfm.com>
Cc: "TLS@ietf.org" <tls@ietf.org>
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Subject: Re: [TLS] draft-ietf-tls-esni feedback
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On Mon, Oct 21, 2019 at 6:06 AM Eric Rescorla <ekr@rtfm.com> wrote: > >> >> I hadn't seen the fixed-but-variable length construction that the "zeros" >> field uses before (although I haven't written much TLS code). >> > > It is used in other places. See, for instance: > https://tools.ietf.org/rfcmarkup?doc=8446#section-5.2 > Ah. I have only worked on some handshake messages, and it was new to me. In the future, I think it might be worth calling out this kind of field as a distinct type. Maybe "dependent vector"? The TLS 1.3 RFC does say "The size of the vector may be specified at documentation time or left unspecified until runtime", but I thought the latter part of that sentence was referring to variable-length vectors. > Judging by the mailing list archives, the design of the field is >> intentional. It's not clear to me why "zeros" wasn't specified as >> variable-length with a prose restriction, though. >> > > Because then you have a spurious length field. > I don't understand why it would be spurious. In this case, the deserializing implementation needs to inspect every byte anyway. > This part of the spec is also just generally difficult to follow, in my >> opinion. I had no trouble following the ESNIKeys section. Perhaps the >> problem is in the interaction of prose order, serialization order, and >> procedural code order. >> > > Well, this structure is likely to change a fair bit, so probably not worth > trying to update the text right at this moment. > Fair enough. I would also suggest making sure that this section does not span a page boundary. That made things worse for me. thanks, Rob
- [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Christian Huitema
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Patrick McManus
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Ben Schwartz
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Ben Schwartz
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Salz, Rich
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Salz, Rich
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Eric Rescorla
- Re: [TLS] draft-ietf-tls-esni feedback Ben Schwartz
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Christian Huitema
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- [TLS] ESNI padding Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Salz, Rich
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Watson Ladd
- Re: [TLS] draft-ietf-tls-esni feedback Bill Frantz
- Re: [TLS] draft-ietf-tls-esni feedback Watson Ladd
- Re: [TLS] draft-ietf-tls-esni feedback Ilari Liusvaara
- Re: [TLS] draft-ietf-tls-esni feedback Ben Schwartz
- Re: [TLS] draft-ietf-tls-esni feedback Ilari Liusvaara
- Re: [TLS] draft-ietf-tls-esni feedback Ilari Liusvaara
- Re: [TLS] draft-ietf-tls-esni feedback Ben Schwartz
- Re: [TLS] draft-ietf-tls-esni feedback Rob Sayre
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Christopher Wood
- Re: [TLS] draft-ietf-tls-esni feedback Stephen Farrell
- Re: [TLS] draft-ietf-tls-esni feedback Ilari Liusvaara