Re: [sipcore] I-D Action: draft-ietf-sipcore-sip-token-authnz-02.txt

> On 9 Jul 2019, at 23:16, Rifaat Shekh-Yusef <rifaat.ietf@gmail.com> wrote:
> 
> This document is specifically focused on confidential UAs.
> UAs running in the browser, public UAs, will be addressed in a separate document.
Maybe you should make that more clear, as it is very confusing terminology… I see that section 1.2 in your draft defines theses
types, based on RFC 6749. You apply it to the term “UA” which I think confuses things. A “public UA” may have support
for confidentiality, but not from an Oauth point of view. I think we should look for other terms for this.

In addition, I don’t find any text in your draft indicating that “Public UAs” is out of scope.

/O
> 
> Regards,
>  Rifaat
> 
> 
> On Tue, Jul 9, 2019 at 3:29 PM Roman Shpount <roman@telurix.com <mailto:roman@telurix.com>> wrote:
> On Tue, Jul 9, 2019 at 3:11 PM Christer Holmberg <christer.holmberg@ericsson.com <mailto:christer.holmberg@ericsson.com>> wrote:
> >> As far as I know, OAuth for SIP has only been used for REGISTER requests, between the UA and the registrar. 
> >> I have never heard about anyone using it for non-REGISTER authentication, and I wonder whether we even need 
> >> to cover it in the draft. We could limit the scope the REGISTER requests. Then, if anyone ever needs OAuth for non-REGISTER requests, a separate draft can be written.
> > 
> > Really? Normally, for a secure solution, every SIP request, including requests sent by UA in dialog established from the 
> > server to the registered end point must be authenticated. OAuth for REGISTRER requests only is kind of useless since it 
> > does not allow UA to send any messages to the server without some additional authentication mechanism.
> 
> Not sure what you mean by "secure solution", but UAs can still use SIP Digest authentication.
> 
> What I am saying is that only use-case for SIP OAuth I am aware of is for REGISTER.
> 
> How do they get these SIP Digest credentials?
> 
> I am looking at a very simple SIP-Over-Websockets client scenario:
> 
> User logs into the web site which uses OAuth. UA, running in the browser gets a token which is used to Register UA with a SIP proxy.
> 
> What credentials is UA using to place a call (send INVITE to the proxy)? 
> If a call comes in from the proxy to UA, what credentials is UA using to hang up the call (send BYE message)?
> 
> Best Regards,
> _____________
> Roman Shpount
>  
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