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Re: [Ace] draft-ietf-ace-oauth-authz-35 - unauthorized AS address, DoS, and privacy

Michael Richardson <mcr+ietf@sandelman.ca> Thu, 10 September 2020 18:47 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [Ace] draft-ietf-ace-oauth-authz-35 - unauthorized AS address, DoS, and privacy
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John Mattsson <john.mattsson=40ericsson.com@dmarc.ietf.org> wrote:
    > - That RS shares the AS address with anybody that asks can be a severe
    > privacy problem. If RS is a medical device, the AS address can reveal
    > sensitive information. If RS is a blood pressure sensor it could
    > e.g. be “AS address =
    > coaps://as.hopkinsmedicine.org/kimmel_cancer_center/”

    > The requirement "the client MUST be able to determine whether an AS has
    > the authority to issue access tokens for a certain RS. This can for
    > example be done through pre-configured lists, or through an online
    > lookup mechanism that in turn also must be secured." indicates that C
    > is required to have another mechanism to determine the AS for a
    > specific RS and that the unauthorized AS address is completely
    > redundant.

This is a hard problem.
  Q: "Who are you?"
  A: "Depends upon who is asking! Who are you?"
  A: "Depends upon who is asking! Who are you?"
  ...

The DNS-SD WG produced rfc8882, but as I understand it,
   https://datatracker.ietf.org/doc/html/draft-ietf-dnssd-privacy-05
was abandonned because the WG did not see implementation/energy.
I can't seem to find the thread discussing that state.

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

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