Re: [Ace] "sub" and "iss" ... RE: WGLC feedback on draft-ietf-ace-cwt-proof-of-possession-02

Roman Danyliw <rdd@cert.org> Tue, 26 June 2018 01:54 UTC

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From: Roman Danyliw <rdd@cert.org>
To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, "ace@ietf.org" <ace@ietf.org>
Thread-Topic: "sub" and "iss" ... RE: WGLC feedback on draft-ietf-ace-cwt-proof-of-possession-02
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Date: Tue, 26 Jun 2018 01:54:31 +0000
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Subject: Re: [Ace] "sub" and "iss" ... RE: WGLC feedback on draft-ietf-ace-cwt-proof-of-possession-02
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Hi Hannes!

> -----Original Message-----
> From: Hannes Tschofenig [mailto:Hannes.Tschofenig@arm.com]
> Sent: Friday, June 22, 2018 9:36 AM
> To: Roman Danyliw <rdd@cert.org>;; ace@ietf.org
> Subject: "sub" and "iss" ... RE: WGLC feedback on draft-ietf-ace-cwt-proof-of-
> possession-02
> 
> Hi Roman,
> 
> this is also a good question:
> 
> > (3) (Editorial) Page 4, Section 3.0, I read to the end of this section by which
> point there has been discussion of "sub" or "iss".  I was left wondering about
> how to interpret the case where both are present and none are.
> 
> Here is the text from the draft:
> 
> "
>    The presenter can be identified in one of several ways by the CWT
>    depending upon the application requirements.  If the CWT contains a
>    "sub" (subject) claim [CWT], the presenter is normally the subject
>    identified by the CWT.  (In some applications, the subject identifier
>    will be relative to the issuer identified by the "iss" (issuer) claim
>    [CWT].)  If the CWT contains no "sub" claim, the presenter is
>    normally the issuer identified by the CWT using the "iss" claim.  The
>    case in which the presenter is the subject of the CWT is analogous to
>    Security Assertion Markup Language (SAML) 2.0
>    [OASIS.saml-core-2.0-os] SubjectConfirmation usage.  At least one of
>    the "sub" and "iss" claims is typically present in the CWT and some
>    use cases may require that both be present.
> "
> 
> The CWT PoP document does not define the subject or issuer claims.
> The document also not mandate a specific set of claims to be included in a
> CWT since this is application profile specific.
> 
> Hence, I am wondering whether we could shorten the paragraph above,
> which is actually a bit confusing.
> 
> "
> This specification adds a new claim to offer the proof-of-possession
> functionality.
> There are various claims already defined and the IANA claims registry [REF]
> contains the most up-to-date list of standardized claims. Application using
> the CWT functionality define what claims have to be used.
> 
>   The presenter can, if necessary, be identified in one of several ways by the
> CWT
>    depending upon the application requirements.  If the CWT contains a
>    "sub" (subject) claim [CWT], the presenter is the subject
>    identified by the CWT. In some cases, there CWT may not include a "sub"
>    claim, which allows the presenter to remain anonymous.
> "

I like this shortened paragraph proposed above.  IMO, it's simpler and more appropriate in this draft.

Thanks,
Roman

> Ciao
> Hannes
> 
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