Authors, Thank you for the discussion and suggested changes. Our files now reflect the updates below (see <https://www.rfc-editor.org/authors/rfc9679-lastrfcdiff.html> for a snapshot of the changes). Please review and let us know if these changes are agreeable or if any further updates are needed. We will then ask the AD to approve them.
1) Section 5.3 OLD: Any party in possession of a key that is represented as a COSE Key can use the COSE Key Thumbprint. NEW: The only prerequisites are that the COSE_Key representation of the key be defined and the party creating the COSE Key Thumbprint be in possession of the necessary key material. ... 2) Addition of New Section. Note that we made “json web key” uppercase for consistency. NEW: 5.5 Relationship to JSON Web Key Thumbprints The ckt of a cose key and jkt of a JSON Web Key are different, even when underlying cryptographic key material is the same. This document does not register a JWT claim for using ckt as a confirmation method for a JWT or a CWT claim for using jkt as a confirmation method for a CWT. ... 3) Section 8 OLD: Confirmation Method Name: ckt Confirmation Method Description: COSE Key SHA-256 Thumbprint JWT Confirmation Method Name: jkt NEW: Confirmation Method Name: ckt Confirmation Method Description: COSE Key SHA-256 Thumbprint JWT Confirmation Method Name: (none) —FILES (please refresh)— The updated XML file is here: https://www.rfc-editor.org/authors/rfc9679.xml The updated output files are here: https://www.rfc-editor.org/authors/rfc9679.txt https://www.rfc-editor.org/authors/rfc9679.pdf https://www.rfc-editor.org/authors/rfc9679.html This diff file shows all changes made during AUTH48: https://www.rfc-editor.org/authors/rfc9679-auth48diff.html These diff files show only changes made during the last edit round: https://www.rfc-editor.org/authors/rfc9679-lastdiff.html https://www.rfc-editor.org/authors/rfc9679-lastrfcdiff.html This diff file shows all changes made to date: https://www.rfc-editor.org/authors/rfc9679-diff.html For the AUTH48 status of this document, please see: https://www.rfc-editor.org/auth48/rfc9679 Thank you, RFC Editor/kc > On Dec 3, 2024, at 7:55 AM, Hannes Tschofenig <hannes.tschofe...@gmail.com> > wrote: > > Thanks for the insightful comment, Orie. I agree with your proposed edits for > the IANA consideration section and the extra text before the section on > relationship to certificate thumbprints. > > I am also fine with the additional text Mike proposed. > > It is indeed too late to add new functionality at this point in time. > > Ciao > Hannes > > > On Tue, Dec 3, 2024 at 3:13 AM Michael Jones <michael_b_jo...@hotmail.com> > wrote: > I support adding the section that Orie proposed. > > > > However in reviewing related text, I unfortunately found a problem. Reading > https://datatracker.ietf.org/doc/html/draft-ietf-cose-key-thumbprint-06#section-5.3, > it differs from https://www.rfc-editor.org/rfc/rfc7638#section-3.5 in a > counterproductive and overly restrictive way. Please change: > > > > Any party in possession of a key that is represented as a COSE Key can > > use the COSE Key Thumbprint. > > > > to: > > > > The only prerequisites are that the COSE_Key representation > > of the key be defined and the party creating the COSE Key Thumbprint > > be in possession of the necessary key material. > > > > That way it will be more actionable and will parallel the corresponding RFC > 7638 text. > > > > Thanks all, > > -- Mike > > > > From: Orie Steele <orie@transmute.industries> > Sent: Monday, December 2, 2024 5:55 PM > To: Michael Jones <michael_b_jo...@hotmail.com> > Cc: Hannes Tschofenig <hannes.tschofe...@gmail.com>; Hannes Tschofenig > <hannes.tschofe...@gmx.net>; RFC Editor <rfc-edi...@rfc-editor.org>; Isobe > Kohei <isobeko...@gmail.com>; cose-...@ietf.org; Cose Chairs Wg > <cose-cha...@ietf.org>; Paul Wouters <paul.wout...@aiven.io>; auth48archive > <auth48archive@rfc-editor.org> > Subject: Re: AUTH48: RFC-to-be 9679 <draft-ietf-cose-key-thumbprint-06> for > your review > > > > Let's add a section to the document, before the section on relationship to > certificate thumbprints. > > > > 5.5 Relationship to JSON Web Key Thumbprints > > > > The ckt of a cose key, and jkt of a json web key are different, even when > underlying cryptographic key material is the same. > > > > This document does not register a JWT claim for using ckt as a confirmation > method for a JWT, or a CWT claim for using jkt as a confirmation method for a > CWT. > > > > > > > > > > On Mon, Dec 2, 2024, 6:26 PM Orie Steele <orie@transmute.industries> wrote: > > I agree, let's just stick with the simple (none) solution. > > > > Hannes can you approve or suggest changes to the clarifying text that makes > it clear this is not an oversight? > > > > Mike, do you object to that clarifying text assuming we take you change to > the IANA considerations section? > > > > OS > > > > On Mon, Dec 2, 2024, 5:56 PM Michael Jones <michael_b_jo...@hotmail.com> > wrote: > > I’m either fine with Orie’s proposed change to the registration wording or > the following one: > > > > From: > > Confirmation Method Name: ckt > Confirmation Method Description: COSE Key SHA-256 Thumbprint > JWT Confirmation Method Name: jkt > > To: > > Confirmation Method Name: ckt > Confirmation Method Description: COSE Key SHA-256 Thumbprint > JWT Confirmation Method Name: (none) > > For the record, I’m not OK trying to add a ckt JWT “cnf” method as an AUTH48 > action (despite me appreciating Orie’s discussion of the possibility). > > > > Cheers, > > -- Mike > > > > From: Orie Steele <orie@transmute.industries> > Sent: Monday, December 2, 2024 2:55 PM > To: Hannes Tschofenig <hannes.tschofe...@gmail.com> > Cc: Hannes Tschofenig <hannes.tschofe...@gmx.net>; RFC Editor > <rfc-edi...@rfc-editor.org>; Isobe Kohei <isobeko...@gmail.com>; > cose-...@ietf.org; Cose Chairs Wg <cose-cha...@ietf.org>; Michael Jones > <michael_b_jo...@hotmail.com>; Paul Wouters <paul.wout...@aiven.io>; > auth48archive@rfc-editor.org > Subject: Re: AUTH48: RFC-to-be 9679 <draft-ietf-cose-key-thumbprint-06> for > your review > > > > This is indeed a bug, for extra assurance that it is a problem: > > How would you use a ckt to verify a JWT that was using "cnf"? > > Here is a more complete fix for the bug: > > https://datatracker.ietf.org/doc/html/draft-ietf-cose-key-thumbprint-06#section-5.3 > > Note that the ckt of a cose key, and jkt of a json web key are different, > even when underlying cryptographic key material is the same. > > ckt is a binary string and jkt is always a base64url string encoded as > described in section 6.1 of RFC9449. > To use a ckt claim inside a JWT, the ckt claim value MUST be base64url > encoded. > The example provided in section 6.1 of RFC9449 is modified to distinguish > confirmation with a CKT instead of JKT: > { > "sub":"some...@example.com", > "iss":"https://server.example.com";, > "nbf":1562262611, > "exp":1562266216, > "cnf": { > "ckt":"SWvYr63zB-WwjGSwQhv53AFSijRKQ72oj63RZp2iU-w" > } > } > > I used the same base64url encoded thumbprint the draft already used for extra > clarity. > > ckt would also need to be added here: > https://www.iana.org/assignments/jwt/jwt.xhtml#confirmation-methods > > This kind of change might need to be taken to the relevant lists for > review... and maybe another WGLC. > > ... we could leave the "ckt" in JWT cnf registration to another document, but > I think at a minimum we need something added to section 5.3 to the effect of: > > Note that the ckt of a cose key, and jkt of a json web key are different, > even when underlying cryptographic key material is the same. > ckt is a binary string and jkt is always a base64url string encoded as > described in section 6.1 of RFC9449. > > ^ If we are comfortable with this change alone, we still have a problem with > the registration template: > https://www.rfc-editor.org/rfc/rfc8747.html#name-registration-template > > """ > CWT claims should normally have a corresponding JWT claim. If a corresponding > JWT claim would not make sense, the designated experts can choose to accept > registrations for which the JWT Claim Name is listed as "N/A". > """ > > The logical JWT claim is "ckt"... not "jkt"... so N/A... does not make > sense... and leaving it blank also does not make sense. > > There is also the x5t claim which sets the precedent that ckt is for cose > key, jkt is for json web key, and x5t is for x.509 certs. > > I propose: > > From: > > Confirmation Method Name: ckt > Confirmation Method Description: COSE Key SHA-256 Thumbprint > JWT Confirmation Method Name: jkt > > To: > > Confirmation Method Name: ckt > Confirmation Method Description: COSE Key SHA-256 Thumbprint > JWT Confirmation Method Name: Not assigned by RFCXXXX ( not to be confused > with x5t or jkt ) > > > OS > > > > On Mon, Dec 2, 2024 at 4:14 PM Hannes Tschofenig > <hannes.tschofe...@gmail.com> wrote: > > Thanks for the work on the draft and sorry for the slow response. > > > > I read through the draft carefully today and in general the edits look good > but I noticed a possible bug. > > > > In the IANA consideration section we say that the ckt confirmation method > maps to the jkt JWT configuration method. I double-checked RFC 9449, which > defines the jkt, and it defines the computation as follows: > > " > The value of the jkt member MUST be the base64url encoding > > of the JWK SHA-256 Thumbprint. > " > > In draft-ietf-cose-key-thumbprint-06 we define the ckt thumbprint as the hash > of the deterministic encoding of the COSE_Key structure. > > > > So, the question to me is whether we can even map the ckt to the jkt since > the underlying structure that is hashed is different: JWK vs. COSE_Key > structure. > > > > For that reason I believe it would be more correct to change the IANA > consideration section by omitting the JWT Confirmation Method Name. > > Here is the proposed change: > > From: > > Confirmation Method Name: ckt > Confirmation Method Description: COSE Key SHA-256 Thumbprint > JWT Confirmation Method Name: jkt > > > To: > > Confirmation Method Name: ckt > Confirmation Method Description: COSE Key SHA-256 Thumbprint > JWT Confirmation Method Name: > > > Do you agree with me? > > > > Sorry for noticing this issue only now. > > > > Ciao > > Hannes > > > > Betreff: > > AUTH48: RFC-to-be 9679 <draft-ietf-cose-key-thumbprint-06> for your review > > Datum: > > Mon, 21 Oct 2024 14:30:59 -0700 (PDT) > > Von: > > rfc-edi...@rfc-editor.org > > An: > > isobeko...@gmail.com, hannes.tschofe...@gmx.net, orie@transmute.industries > > Kopie (CC): > > rfc-edi...@rfc-editor.org, cose-...@ietf.org, cose-cha...@ietf.org, > michael_b_jo...@hotmail.com, paul.wout...@aiven.io, > auth48archive@rfc-editor.org > > > > *****IMPORTANT***** > > Updated 2024/10/21 > > RFC Author(s): > -------------- > > Instructions for Completing AUTH48 > > Your document has now entered AUTH48. 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Please use ‘REPLY ALL’, > as all the parties CCed on this message need to see your approval. > > > Files ----- > > The files are available here: > https://www.rfc-editor.org/authors/rfc9679.xml > https://www.rfc-editor.org/authors/rfc9679.html > https://www.rfc-editor.org/authors/rfc9679.pdf > https://www.rfc-editor.org/authors/rfc9679.txt > > Diff file of the text: > https://www.rfc-editor.org/authors/rfc9679-diff.html > https://www.rfc-editor.org/authors/rfc9679-rfcdiff.html (side by side) > > Diff of the XML: https://www.rfc-editor.org/authors/rfc9679-xmldiff1.html > > > Tracking progress > ----------------- > > The details of the AUTH48 status of your document are here: > https://www.rfc-editor.org/auth48/rfc9679 > > Please let us know if you have any questions. > Thank you for your cooperation, > > RFC Editor > > -------------------------------------- > RFC9679 (draft-ietf-cose-key-thumbprint-06) > > Title : CBOR Object Signing and Encryption (COSE) Key Thumbprint > Author(s) : K. Isobe, H. Tschofenig, O. Steele > WG Chair(s) : Matthew A. Miller, Ivaylo Petrov, Michael B. Jones > > Area Director(s) : Deb Cooley, Paul Wouters > > > > > > -- > > > ORIE STEELE > Chief Technology Officer > www.transmute.industries > -- auth48archive mailing list -- auth48archive@rfc-editor.org To unsubscribe send an email to auth48archive-le...@rfc-editor.org
