Okay that’s fine. It was just the wording of this one sentence that made me ask 
this question.
> Am 13.12.2019 um 07:45 schrieb Benjamin Kaduk <ka...@mit.edu>:
> 
> On Wed, Dec 11, 2019 at 12:48:58PM -0500, Russ Housley wrote:
>> Mirja:
>> 
>>> ----------------------------------------------------------------------
>>> COMMENT:
>>> ----------------------------------------------------------------------
>>> 
>>> Just a small thing to double-check: I wonder if this sentence would actually
>>> require an update to RFC8446:
>>>  "TLS 1.3 does not permit the server to send a CertificateRequest
>>>  message when a PSK is being used.  This restriction is removed when
>>>  the "tls_cert_with_extern_psk" extension is negotiated, allowing
>>>  certificate-based authentication for both the client and the server."
>>> Or maybe it should be phrased differently, just:
>>> "If the "tls_cert_with_extern_psk" extension is negotiated, 
>>> certificate-based
>>> authentication is allowed for both the client and the server." I guess it
>>> depends on what exactly is said in RFC8446 (and I didn't went and tried to 
>>> find
>>> it).
>> 
>> I do not believe that an update is needed or appropriate.  First, the 
>> presence of this extension is an indication that this behavior will be 
>> different.  Second, this is going to be an Experimental RFC, so it should 
>> not update a standards-track RFC.
> 
> I agree; this is just an extension working as normal.  (Not that I haven't
> asked the same question before for other documents....)
> 
> -Ben
> 
>>> And as a side note, it is usually recommended to provide the link to the
>>> registry in the IANA section (to make life for IANA easier)
>> 
>> I will gladly add a reference to the registry:
>> 
>> https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml
>> 
>> Russ
>> 
> 

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