Re: [secdir] SECDIR early review of draft-ietf-tokbind-tls13-00
Nick Harper <nharper@google.com> Mon, 02 April 2018 20:26 UTC
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From: Nick Harper <nharper@google.com>
Date: Mon, 02 Apr 2018 13:25:51 -0700
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To: Stephen Kent <stkent@verizon.net>
Cc: secdir@ietf.org, Leif Johansson <leifj@sunet.se>, uta@ietf.org, IETF Tokbind WG <unbearable@ietf.org>, Eric Rescorla <ekr@rtfm.com>
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Subject: Re: [secdir] SECDIR early review of draft-ietf-tokbind-tls13-00
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On Thu, Mar 22, 2018 at 8:00 AM, Stephen Kent <stkent@verizon.net> wrote: > SECDIR *early* review of draft-ietf-tokbind-tls13-00 > > > > > > I have reviewed this document as part of the security directorate's > ongoing effort to review all IETF documents being processed by the IESG. These > comments were written with the intent of improving security requirements > and considerations in IETF drafts. Comments not addressed in last call > may be included in AD reviews during the IESG review. Document editors > and WG chairs should treat these comments just like any other last call > comments. > > > > This (very brief) document defines how to negotiate Token Binding for TLS > v1.3. Existing IETF documents (IDs) define this protocol and how to > negotiate it capability only for earlier versions of TLS. > > > > The first question that comes to mind is why there is a need for a new ID, > instead of adding text to draft-ietf-tokbind-negotiation-10. I realize > that draft-ietf-tokbind-negotiation-10 is in last call, but the text here > is so small that it seems overkill to create a separate RFC. I’m guessing > that the argument is that this document references TLS 1.3, which is not > yet an RFC, and thus the author is trying to avoid creating a down > reference problem with draft-ietf-tokbind-negotiation-10. Right? > That sounds right. My recollection of WG discussions on whether to add this TLS 1.3 language to draft-ietf-tokbind-negotiation was that it was unclear how the tokbind drafts would get sequenced with respect to draft-ietf-tls-tls13 in IETF last call and the RFC Editor's queue, and didn't want the tokbind drafts to get delayed waiting for draft-ietf-tls-tls13 to get published. > > > Section 2 notes that the format of the extension is the same as defined in > draft-ietf-tokbind-negotiation-10, so nothing new there. The section > cites two differences from the behavior in draft-ietf-tokbind-negotiation-10, > which are described in just two sentences. Section 3 adds one paragraph to > deal with 0-RTT, a TLS 1.3 feature not present in earlier versions. Section > 4 is non-normative, but, presumably useful. The security concerns are > asserted to be the same as for draft-ietf-tokbind-negotiation-10, plus a > sentence discussing why the 0-RTT exclusion avoids other potential security > concerns. > > > > So, if folks don’t want to delay publication of draft-ietf-tokbind-negotiation-10, > I guess this is OK as a separate document, updating that RFC. >
- [secdir] SECDIR early review of draft-ietf-tokbin… Stephen Kent
- Re: [secdir] SECDIR early review of draft-ietf-to… Nick Harper