Re: [Insipid] I-D Action: draft-ietf-insipid-session-id-23.txt

"Paul Giralt (pgiralt)" <pgiralt@cisco.com> Tue, 28 June 2016 20:07 UTC

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From: "Paul Giralt (pgiralt)" <pgiralt@cisco.com>
To: Ben Campbell <ben@nostrum.com>
Thread-Topic: [Insipid] I-D Action: draft-ietf-insipid-session-id-23.txt
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Date: Tue, 28 Jun 2016 20:06:21 +0000
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Subject: Re: [Insipid] I-D Action: draft-ietf-insipid-session-id-23.txt
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Ben,

Thanks for the guidance. See inline…


> - The text states that, since the session-IDs must not contain device or user identifying information, they have no privacy considerations. That sort of statement is a bit of a red flag during IESG review. In particular, it would be good to also say something about the use of a session-ID as a persistent identifier to correlate across session.


Ok - I will fix this.


> As it is, 4.2 says they generate a new, previously unused UUID. Is there any normative text about reusing the UUID for more than one "session"? (Not counting the text about transfers, etc.).


The only the only text  is Section 6 which describes the conditions under which the UUID is maintained. The transfer / redirect cases are the only time a UUID is “reused” and even then, it’s not really being reused for a different “session” but that depends on what you fine as being a session. That may be the issue - that we don’t clearly define what a session is.

I added an additional line at the end of paragraph 1 in section 4.2 to highlight the persistence of the UUID mentioned in Section 6:

	Section 6 describes how the UUIDs selected by the source and destination UAs persist
        for the duration of the session.

Not sure if that’s necessary, but I figured it can’t hurt.

Would it help if we give a clearer definition of what a “session” means in the context of this specification?

> 
> - The statement that session-id "MUST NOT be used for billing purposes" will probably draw objections. I suggest that be changed ot "is not appropriate for billing purposes." (Not really new text, but the revisions drew my attention to it.)
> 


Ok - fixed.


> Thanks!
> 
> Ben.