[OAUTH-WG] Re: [Technical Errata Reported] RFC9470 (7951)

[Brian Campbell <[e-mail]>]

I suspect a variety of not-entirely-improbable rational could be provided
to explain why it might make sense. But the reality is that it's just a
mistake in the document where somewhere along the way updates were made to
the examples that didn't fully align with content already in those
examples. I try to be careful with details like that but apparently wasn't
careful enough in this case.

On Thu, May 23, 2024 at 5:45 AM Tomasz Kuczyński <
[e-mail]> wrote:

> The introspection response should rather reflect facts related to the
> access token sent for the introspection. So even in case, a new
> authentication event took place after the token issuance, it should not be
> included in the response as the authentication event is not related to the
> introspected access token.
> The inclusion of that information in the introspection response should be
> treated as a vulnerability.
>
> Regardless of the above, the "exp" in response is also earlier than the
> "auth_time", which means that the introspected token is beyond the time
> window of its validity and in fact, the introspection response should
> contain nothing more than {"active": false}.
>
> Best regards
> Tomasz Kuczyński
> W dniu 23.05.2024 o 01:06, Justin Richer pisze:
>
> This seems to be logical - the authentication event would always be before
> the token was issued in the usual case. However, assuming that the AS
> "upgrades" an existing token in-place during a step up, isn't it possible
> for the latest relevant authentication event to come after the token was
> initially issued?
>
>  - Justin
> ------------------------------
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> *Subject:* [OAUTH-WG] [Technical Errata Reported] RFC9470 (7951)
>
> The following errata report has been submitted for RFC9470,
> "OAuth 2.0 Step Up Authentication Challenge Protocol".
>
> --------------------------------------
> You may review the report below and at:
> https://www.rfc-editor.org/errata/eid7951
>
> --------------------------------------
> Type: Technical
> Reported by: Tomasz Kuczyński <[e-mail]>
> <[e-mail]>
>
> Section: 6.2
>
> Original Text
> -------------
>      "exp": 1639528912,
>      "iat": 1618354090,
>      "auth_time": 1646340198,
>
> Corrected Text
> --------------
>      "exp": 1639528912,
>      "iat": 1618354090,
>      "auth_time": 1618354090,
>
> Notes
> -----
> I noticed a small inconsistency in the example "Figure 7: Introspection
> Response". It seems that the time for the user-authentication event should
> be less than or equal to the time of token issuance to ensure logical
> coherence.
>
> Instructions:
> -------------
> This erratum is currently posted as "Reported". (If it is spam, it
> will be removed shortly by the RFC Production Center.) Please
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>
> --------------------------------------
> RFC9470 (draft-ietf-oauth-step-up-authn-challenge-17)
> --------------------------------------
> Title               : OAuth 2.0 Step Up Authentication Challenge Protocol
> Publication Date    : September 2023
> Author(s)           : V. Bertocci, B. Campbell
> Category            : PROPOSED STANDARD
> Source              : Web Authorization Protocol
> Stream              : IETF
> Verifying Party     : IESG
>
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> --
> Tomasz Kuczynski
>
> Applications Division
> Large Scale Applications and Services Department Manager
> Poznan Supercomputing and Networking Center
> Polish Academy of Sciences
> Jana Pawla II 10, Room 1.28
> 61-139 Poznan, Poland
> Tel.: [phone]
>
>

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