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From: =?UTF-8?Q?I=C3=B1aki_Baz_Castillo?= <ibc@aliax.net>
Date: Sat, 11 Mar 2017 16:25:46 +0100
Message-ID: <CALiegfkfntWj56NEXhr_waogJtsw9oy_P0Jo331ba_WNzBGRSQ@mail.gmail.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/vg24CqviTDU-_UJf0j0manepxsA>
Cc: Flemming Andreasen <fandreas@cisco.com>, "hta@google.com" <hta@google.com>,
 mmusic@ietf.org
Subject: Re: [MMUSIC] Handling of unverified data and media
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AFAIK you dont need a SDP aswer for that.

El 11/3/2017 16:24, "Christer Holmberg" <christer.holmberg@ericsson.com>
escribi=C3=B3:

> Hi,
>
> In case of a Data Channel, you also need to establish the SCTP associatio=
n
> before you can send any content.
>
> Regards,
>
> Christer
>
> -----Original Message-----
> From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of I=C3=B1aki Baz
> Castillo
> Sent: 11 March 2017 17:12
> To: Roman Shpount <roman@telurix.com>
> Cc: Flemming Andreasen <fandreas@cisco.com>; 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>:
> > 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 th=
e
> 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.
>
>
> --
> I=C3=B1aki Baz Castillo
> <ibc@aliax.net>
>
> _______________________________________________
> mmusic mailing list
> mmusic@ietf.org
> https://www.ietf.org/mailman/listinfo/mmusic
>

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<div dir=3D"auto">AFAIK you dont need a SDP aswer for that.</div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">El 11/3/2017 16:24, &quot;C=
hrister Holmberg&quot; &lt;<a href=3D"mailto:christer.holmberg@ericsson.com=
">christer.holmberg@ericsson.com</a>&gt; escribi=C3=B3:<br type=3D"attribut=
ion"><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
In case of a Data Channel, you also need to establish the SCTP association =
before you can send any content.<br>
<br>
Regards,<br>
<br>
Christer<br>
<br>
-----Original Message-----<br>
From: mmusic [mailto:<a href=3D"mailto:mmusic-bounces@ietf.org">mmusic-boun=
ces@ietf.<wbr>org</a>] On Behalf Of I=C3=B1aki Baz Castillo<br>
Sent: 11 March 2017 17:12<br>
To: Roman Shpount &lt;<a href=3D"mailto:roman@telurix.com">roman@telurix.co=
m</a>&gt;<br>
Cc: Flemming Andreasen &lt;<a href=3D"mailto:fandreas@cisco.com">fandreas@c=
isco.com</a>&gt;; <a href=3D"mailto:hta@google.com">hta@google.com</a>; mmu=
sic WG &lt;<a href=3D"mailto:mmusic@ietf.org">mmusic@ietf.org</a>&gt;<br>
Subject: Re: [MMUSIC] Handling of unverified data and media<br>
<br>
2017-03-10 23:47 GMT+01:00 Roman Shpount &lt;<a href=3D"mailto:roman@teluri=
x.com">roman@telurix.com</a>&gt;:<br>
&gt; My assumption always was that data is received, decoded and discarded<=
br>
&gt; until fingerprint is received and verified. This way DTLS handshake<br=
>
&gt; completes, key frames are decoded, but user is nor presented with any =
unverified media.<br>
<br>
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 DataCha=
nnel messages to the browser *before* the browser receives the SDP answer.<=
br>
<br>
Do you mean that such a DataChannel messages should be discarded? I conside=
r 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 signal=
ing handshake (send offer, receive answer, send<br>
ACK) before the server sends any DataChannel message.<br>
<br>
<br>
--<br>
I=C3=B1aki Baz Castillo<br>
&lt;<a href=3D"mailto:ibc@aliax.net">ibc@aliax.net</a>&gt;<br>
<br>
______________________________<wbr>_________________<br>
mmusic mailing list<br>
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<a href=3D"https://www.ietf.org/mailman/listinfo/mmusic" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/mmusic</a><br=
>
</blockquote></div></div>

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