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[TLS] Re: Mike Bishop's Yes on draft-ietf-tls-8773bis-10: (with COMMENT)

Eric Rescorla <ekr@rtfm.com> Wed, 03 September 2025 12:41 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Wed, 03 Sep 2025 05:41:15 -0700
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To: Russ Housley <housley@vigilsec.com>
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CC: IESG <iesg@ietf.org>, draft-ietf-tls-8773bis@ietf.org, tls-chairs@ietf.org, IETF TLS <tls@ietf.org>, Joe Salowey <jsalowey@gmail.com>
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Subject: [TLS] Re: Mike Bishop's Yes on draft-ietf-tls-8773bis-10: (with COMMENT)
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I don't understand this text. In this context, supported_groups is not
optional.

   The client includes the "tls_cert_with_extern_psk" extension in the
   ClientHello message.  The "tls_cert_with_extern_psk" extension MUST
   be accompanied by the "key_share", "psk_key_exchange_modes", and
   "pre_shared_key" extensions.  The client MAY also find it useful to
   include the "supported_groups" extension.  Since the

But if you send "key_share" you need to send "supported_groups" because
TLS 1.3 requires that the group be selected out of "supported_groups".

-Ekr


On Tue, Sep 2, 2025 at 12:07 PM Russ Housley <housley@vigilsec.com> wrote:

> Mike:
>
> > ----------------------------------------------------------------------
> > COMMENT:
> > ----------------------------------------------------------------------
> >
> > Section 4: "MAY also find it useful" means that the client is permitted,
> but
> > not required, to find the extension useful. Is that the intended sense?
> I'd
> > suggest that this is a lowercase "may" or better yet "might".
>
> Suggestion:
>
> The client MAY also include the "supported_groups" extension.
>
> Russ
>
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