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Re: [TLS] WGLC for draft-ietf-tls-ticketrequests

Rob Sayre <sayrer@gmail.com> Mon, 03 February 2020 03:40 UTC

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From: Rob Sayre <sayrer@gmail.com>
Date: Sun, 02 Feb 2020 19:39:51 -0800
Message-ID: <CAChr6SwkwEntnigHaQ8rnN0Ku_MKbGcFFh4EBSaUtrxfQaMdUg@mail.gmail.com>
To: Daniel Migault <daniel.migault=40ericsson.com@dmarc.ietf.org>
Cc: Eric Rescorla <ekr@rtfm.com>, "<tls@ietf.org>" <tls@ietf.org>
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Subject: Re: [TLS] WGLC for draft-ietf-tls-ticketrequests
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On Sun, Feb 2, 2020 at 11:52 AM Daniel Migault <daniel.migault=
40ericsson.com@dmarc.ietf.org> wrote:

>
> On Sun, Feb 2, 2020 at 12:09 PM Eric Rescorla <ekr@rtfm.com> wrote:
>
>>
>>
>> 1. TLS 1.3 takes the position that reuse is bad and that position
>>    is for good reasons, so we shouldn't undercut it in a new
>>    extension.
>>
>>

> . Appendix C.4 discourages tickets re-use when Client tracking is a
> concern. The section uses SHOULD and not MUST. So, in fact, TLS 1.3 takes
> position this is not mandatory to renew tickets.
>

RFC 2119 is a bit stronger than that: implementations are not required to
interoperate with parties that violate the "SHOULD" (that is reserved for
requirements designated with "MAY").

thanks,
Rob

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