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Re: [COSE] [Last-Call] Iotdir telechat review of draft-ietf-cose-x509-07

Michael Richardson <mcr+ietf@sandelman.ca> Tue, 20 October 2020 01:15 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Carsten Bormann <cabo@tzi.org>, iot-directorate@ietf.org, last-call@ietf.org, draft-ietf-cose-x509.all@ietf.org, cose@ietf.org
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Subject: Re: [COSE] [Last-Call] Iotdir telechat review of draft-ietf-cose-x509-07
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Thank you for the timely review!

Carsten Bormann via Datatracker <noreply@ietf.org> wrote:
    > These rules apply when the validation succeeds in a single step as
    > well as when certificate chains need to be built.

    > The draft uses the term "bag" for what is meant to be a set.
    > Maybe stick with the "x5bag" parameter name and the prose "certificate
    > bag", but when saying what it is, say that it is a set.

I believe we use the term bag because it is permissible for a certificate
artifact to appear more than once. Stupid maybe, but permissible.

I think that some systems/libaries considered the Issuer/Subject to be the
key for indexing the set, and then they got confused if there was more than
one certificate in the bag.  The additional object used a different signature
and/or hash.  At least, I have some dim memory of some situation being
described to me.  I think that the names of the guilty parties were withheld.

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide

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