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Re: [rtcweb] How to determine TLS roles?

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 11 February 2014 15:56 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Tim Panton <tim@phonefromhere.com>
Thread-Topic: [rtcweb] How to determine TLS roles?
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Date: Tue, 11 Feb 2014 15:56:10 +0000
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] How to determine TLS roles?
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Hi,

>>> However, signalling it over your high level signalling protocol is the wrong way to do it (IMHO). Your peer should 
>>> deduce the appropriate DTLS role from the 'signalling' in the ICE packets, by looking at the ICE CONTROLLING flag.
>>
>> In SIP/SDP O/A it is done using the setup attribute (red: high level signalling protocol), and JSEP is based on SDP O/A, so...
>>
>> If we do NOT want to use the setup attribute to determine the DTLS roles, then I think we need to have a separate discussion about that.
>
> we are using the  setup attribute in a way. - actpass means we are saying "we don't care". 

That is NOT what it means in SDP O/A - it means "the other side decides" :)

> That leaves it to the lower levels to sort it out - via the iceControlling flag.
>
> So now you see what caused the rant :-)

One way would be to add some flag/parameter, to explicitly indicate the usage of the iceControlling flag to determine the roles - if people want to do that. The advantage is that it would be independent of the signalling protocol used between the peers.

Regards,

Chrsiter

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