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Secure Telephone Identity Revisited (Active WG)
Art Area: Adam Roach, Alexey Melnikov, Ben Campbell | 2013-Aug-30 —  

IETF-103 stir minutes

Session 2018-11-05 1120-1220: Meeting 1 - Audio stream - stir chatroom


minutes-103-stir-00 minutes

          Minutes - Secure Telephone Identity Revisited (STIR) - IETF 103
          MONDAY, 5 November 2018 at 1120
          Chris Wendt (Comcast) talked about draft-ietf-stir-passport-shaken.  The
          document is in IETF Last Call, and this discussion focused on resolving
          that were raised.  The origid field carries an opaque value that
          the service provider, not the call originator, so it does not leak
          information.  Chris to add text to Privacy Considerations pointing to base
          PASSporT specification and explaining that the use of origid.
          Jon Peterson (Neustar) talked about draft-ietf-stir-passport-divert.
          A recent
          question came up about having a signature over R-URIs.  This document was
          created to handle a change to the administrative domain. Note that
          there are
          two very different use cases.  The first one is call forwarding.
          The second
          one is a call to 1-800-United that us redirected to a geographic phone
          In the second case, the end user knows that the recipient is representing
          1-800-United.  The core mechanism handles both use cases, and there is
          no need
          to change the mechanism to address the R-URI.  In exceptional cases,
          the R-URI
          changes, but for the standard call forwarding scenarios,  the use of
          div is
          straightforward. Further, if a div includes a R-URI that is radically
          different than the original To field, then it is easier for a verification
          service to determine that it is not a cut-and-paste attack.  The document
          ready for WG Last Call.
          Jon Peterson (Neustar) talked about draft-ietf-stir-oob. This document is
          already in WG Last Call, but the WG Chairs haven't made a consensus
          call yet.
          The WG is going to publish this framework, but not protocol that
          the framework.
          Chris Wendt (Comcast) talked about draft-ietf-stir-passport-rcd.
          The group
          discussed whether it would be better to include a jCard by reference
          or value.
          A reference would be a URL to fetch the jCard.  A value would include the
          jCard in the PASSporT directly.  Alternatively, the whole jCard could be
          carried a SIP request, but the PASSporT signature could cover it.  In
          addition, a reference naturally supports many formats, not just jCard.  If
          integrity of the referenced jCard is needed, the reference can include
          a hash
          of the expected jCard.  Of course, a jCard itself can have URLs inside
          and the hash value does not provide integrity for the objects that they
          reference.  There is concern that including a jCard by value will make the
          PASSporT too large.  The next version of the document will support
          both value
          and reference, and then we will see what actually gets used.

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