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Re: [MMUSIC] Handling of unverified data and media

Christer Holmberg <christer.holmberg@ericsson.com> Sat, 11 March 2017 15:30 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Iñaki Baz Castillo <ibc@aliax.net>
Thread-Topic: [MMUSIC] Handling of unverified data and media
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Date: Sat, 11 Mar 2017 15:30:25 +0000
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Cc: Flemming Andreasen <fandreas@cisco.com>, "hta@google.com" <hta@google.com>, "mmusic@ietf.org" <mmusic@ietf.org>
Subject: Re: [MMUSIC] Handling of unverified data and media
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Hi,

>AFAIK you dont need a SDP aswer for that.

Perhaps not, but it will still take some time to do, so maybe the offerer will have received the answer once it’s done and it is possible to start sending any media?

Regards,

Christer


El 11/3/2017 16:24, "Christer Holmberg" <christer.holmberg@ericsson.com<mailto:christer.holmberg@ericsson.com>> escribió:
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<mailto:mmusic-bounces@ietf.org>] On Behalf Of Iñaki Baz Castillo
Sent: 11 March 2017 17:12
To: Roman Shpount <roman@telurix.com<mailto:roman@telurix.com>>
Cc: Flemming Andreasen <fandreas@cisco.com<mailto:fandreas@cisco.com>>; hta@google.com<mailto:hta@google.com>; mmusic WG <mmusic@ietf.org<mailto: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<mailto:roman@telurix.com>>:
> 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<mailto:ibc@aliax.net>>

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