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 <[email protected]>
Sent: Monday, December 2, 2024 2:55 PM
To: Hannes Tschofenig <[email protected]>
Cc: Hannes Tschofenig <[email protected]>; RFC Editor
<[email protected]>; Isobe Kohei <[email protected]>;
[email protected]; Cose Chairs Wg <[email protected]>; Michael Jones
<[email protected]>; Paul Wouters <[email protected]>;
[email protected]
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":"[email protected]<mailto:[email protected]>",
"iss":"https://server.example.com<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
<[email protected]<mailto:[email protected]>> 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:
[email protected]<mailto:[email protected]>
An:
[email protected]<mailto:[email protected]>,
[email protected]<mailto:[email protected]>,
[email protected]<mailto:[email protected]>
Kopie (CC):
[email protected]<mailto:[email protected]>,
[email protected]<mailto:[email protected]>,
[email protected]<mailto:[email protected]>,
[email protected]<mailto:[email protected]>,
[email protected]<mailto:[email protected]>,
[email protected]<mailto:[email protected]>
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--------------------------------------
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<http://www.transmute.industries/>
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