Re: [MMUSIC] Handling of unverified data and media

Christer Holmberg <christer.holmberg@ericsson.com> Sat, 11 March 2017 15:24 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: =?utf-8?B?ScOxYWtpIEJheiBDYXN0aWxsbw==?= <ibc@aliax.net>, Roman Shpount <roman@telurix.com>
Thread-Topic: [MMUSIC] Handling of unverified data and media
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Date: Sat, 11 Mar 2017 15:24:21 +0000
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Cc: Flemming Andreasen <fandreas@cisco.com>, "hta@google.com" <hta@google.com>, mmusic WG <mmusic@ietf.org>
Subject: Re: [MMUSIC] Handling of unverified data and media
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Hi,

In case of a Data Channel, you also need to establish the SCTP association before you can send any content.

Regards,

Christer

-----Original Message-----
From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Iñaki Baz Castillo
Sent: 11 March 2017 17:12
To: Roman Shpount <roman@telurix.com>
Cc: Flemming Andreasen <fandreas@cisco.com>om>; hta@google.com; mmusic WG <mmusic@ietf.org>
Subject: Re: [MMUSIC] Handling of unverified data and media

2017-03-10 23:47 GMT+01:00 Roman Shpount <roman@telurix.com>om>:
> My assumption always was that data is received, decoded and discarded 
> until fingerprint is received and verified. This way DTLS handshake 
> completes, key frames are decoded, but user is nor presented with any unverified media.

Just imagine an app (running in a computer with public IP) which sends the SDP offer to a server, DTLS handshake is done, and the server sends DataChannel messages to the browser *before* the browser receives the SDP answer.

Do you mean that such a DataChannel messages should be discarded? I consider that catastrophic as the server may not know whether the browser has yet received the answer or not. Apps should implement some kind of 3-way signaling handshake (send offer, receive answer, send
ACK) before the server sends any DataChannel message.


--
Iñaki Baz Castillo
<ibc@aliax.net>

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