Re: [Stox] Stephen Farrell's IESG feedback on draft-ietf-stox-core

Peter Saint-Andre <> Tue, 11 February 2014 15:49 UTC

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Date: Tue, 11 Feb 2014 08:49:47 -0700
From: Peter Saint-Andre <>
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Subject: Re: [Stox] Stephen Farrell's IESG feedback on draft-ietf-stox-core
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On 2/10/14, 3:52 PM, Peter Saint-Andre wrote:
> On 2/10/14, 3:20 PM, Stephen Farrell wrote:
>> Hi Peter,
>> On 02/10/2014 06:24 PM, Peter Saint-Andre wrote:
>>> ( + STOX WG since one of the issues might deserve broader discussion )
>>> Hi Stephen, thanks for your review:
>>> You wrote in part:
>>>     - I wondered why you didn't just say that (D)TLS SHOULD
>>>     be used/supported between gateways. Given that all the
>>>     relevant bits of code are likely to support that, wouldn't
>>>     it be a good thing?
>>> Yes, that seems eminently reasonable.
>> Just to be clear - the above is the only DISCUSS point.
> Yep.
>>>     - Has anyone thought about confusability in the name
>>>     mappings? I expected to see a bit of text in the
>>>     security considerations but didn't see it.
>>> Confusion is always possible. :-) Were you thinking about confusable
>>> characters from Unicode, or something else?
>> Right. Maybe its all there already and I just didn't see
>> if in the mapping stuff, or maybe not. I'm not sure.
> Section 10.5 of draft-ietf-precis-framework has some very nice text
> about visually similar characters. We could borrow from that.
>>>     - It seems a shame to not be able to gateway when the To is
>>>     a sips URI at all but I understand that some loss of
>>>     security is inevitable for cases like this. Is there any
>>>     work planned for an update that would allow gatewaying for
>>>     such cases, e.g. if the 1st XMPP server is the one to which
>>>     the user is connected and the user is connected using
>>>     XMPP/TLS?
>>> Hmm. I cannot say that I am aware of planning for updates to provide
>>> more secure gatewaying, although folks active in the STOX WG might be
>>> thinking along those lines.
>>> Depending on the deployment architecture, I think there are cases where
>>> it is *possible* to TLS-protect all the hops. For instance, if
>>> has a direct server-to-server connection to
>>> (no intermediate hops) and both organizations agree to
>>> force the use of TLS for client connections (e.g., via SLA), then I
>>> suppose that could honor 'sips' URIs when sending
>>> traffic to However, such an arrangement is rare enough
>>> right now that I don't know if it is worth mentioning.
>> Fair enough. I can see that detecting that you (probably) have
>> all (D)TLS hops might be tricky and error prone.
> That's how I see it.
> Oh, and we at least need to mention DTLS for the UDP cases, though (see
> Section 5 of draft-ietf-stox-core).

Hi Stephen,

We've posted an updated version:

We haven't yet added any text about visually similar characters, though. 
Let me know what you think of the rest.


Peter Saint-Andre