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Re: [Anima] ANIMA-WG: pls chime in: early allocation for otherName code points (draft-ietf-anima-autonomic-control-plane)

Michael Richardson <mcr+ietf@sandelman.ca> Thu, 02 July 2020 17:29 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: anima@ietf.org
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Date: Thu, 02 Jul 2020 13:29:07 -0400
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Subject: Re: [Anima] ANIMA-WG: pls chime in: early allocation for otherName code points (draft-ietf-anima-autonomic-control-plane)
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Eliot Lear <lear=40cisco.com@dmarc.ietf.org> wrote:
    > I have no objection.  My only caution is that otherName is poorly
    > supported in the open source tool sets, but that is something we could
    > conceivably work on.

I disagree!
otherName is adequately supported (if poorly documented) in openssl.cnf for our purposes.
Creating otherName SAN extensions from library interface is fully supported.

The openssl x509 -text output program does not know how to format arbitrary
otherName text, so it just says <unsupported>.

Here is an proprietary otherName that I created awhile ago, implemented in ruby:

      # the OID: 1.3.6.1.4.1.46930.1 is a Private Enterprise Number OID:
      #    iso.org.dod.internet.private.enterprise . SANDELMAN=46930 . 1
      @idevid.add_extension(extension_factory.create_extension(
                              "subjectAltName",
                              sprintf("otherName:1.3.6.1.4.1.46930.1;UTF8:%s",
                                      self.sanitized_eui64),
                              false))

The hardest part was figuring out the ";UTF8:" part, as I had to read the C
code underneath to learn how that worked.
(false, is I think, whether it is critical)

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-

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