Subject: Re: [Last-Call] [stir] Last Call: <draft-ietf-stir-passport-divert-07.txt> (PASSporT Extension for Diverted Calls) to Proposed Standard

From: Jack Rickard <[email-masked]>
Date: Fri, 29 Nov 2019 17:29:32 +0000

Hello,

I have been attempting to implement the changes described in this draft, however I have come across issues that have made this difficult, if not impossible.

The format of the "dest" claim understandably mirrors that of the "orig" claim, however it is also meant to match the "dest" claim of a previous PASSporT, specifically:
> For each "div" PASSporT, the verification service MUST find an earlier PASSporT that contains a "dest" claim with a value equivalent to the "div" claim in each "div" PASSporT.
The word "equivalent" here is not well defined as "dest" and "div" have different structures (the first contains arrays the second single values). However, stating that "div" must equal one of the corresponding values in "dest" is not enough, as it is also not explicit that the "div" header cannot contain both a "tn" and a "uri" claim, which would make this matching impossible.

Lastly, RFC 8224 explicitly left verification of "dest" undefined for future compatibility, and while this doesn't define this, it does impose some meaning to a "dest" claim with multiple values, which seems valuable to note.

Please could you consider addressing these issues before standardising this draft as they leave ambiguity for implementations.

Regards,
Jack Rickard

-----Original Message-----
From: stir <[email-masked]> On Behalf Of The IESG
Sent: 18 November 2019 09:36
To: IETF-Announce <[email-masked]>
Cc: [email-masked]; [email-masked]; [email-masked]; [email-masked]; [email-masked]
Subject: [stir] Last Call: <draft-ietf-stir-passport-divert-07.txt> (PASSporT Extension for Diverted Calls) to Proposed Standard

NOTE: Message is from an external sender

The IESG has received a request from the Secure Telephone Identity Revisited
WG (stir) to consider the following document: - 'PASSporT Extension for
Diverted Calls'
  <draft-ietf-stir-passport-divert-07.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
[email-masked] mailing lists by 2019-12-02. Exceptionally, comments may
be sent to [email-masked] instead. In either case, please retain the beginning
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Abstract

   PASSporT is specified in RFC 8225 to convey cryptographically-signed
   information about the people involved in personal communications.
   This document extends PASSporT to include an indication that a call
   has been diverted from its original destination to a new one.  This
   information can greatly improve the decisions made by verification
   services in call forwarding scenarios.  Also specified here is an
   encapsulation mechanism for nesting a PASSporT within another
   PASSporT that assists relying parties in some diversion scenarios.

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