Re: [rtcweb] Remote recording - RTC-Web client acting as SIPREC session recording client

Matthew Kaufman <matthew.kaufman@skype.net> Thu, 25 August 2011 21:19 UTC

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Date: Thu, 25 Aug 2011 14:19:45 -0700
From: Matthew Kaufman <matthew.kaufman@skype.net>
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To: "Timothy B. Terriberry" <tterriberry@mozilla.com>
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Cc: "rtcweb@ietf.org" <rtcweb@ietf.org>
Subject: Re: [rtcweb] Remote recording - RTC-Web client acting as SIPREC session recording client
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On 8/25/2011 11:50 AM, Timothy B. Terriberry wrote:
> Matthew Kaufman wrote:
>> But this is a bad idea. Providing APIs that let a browser send audio
>> that is being received from the other end to a third party open several
>> different cans of worms simultaneously. One is that there's now another
>
> The currently proposed MediaStream Processing API 
> (http://hg.mozilla.org/users/rocallahan_mozilla.com/specs/raw-file/tip/StreamProcessing/StreamProcessing.html) 
> essentially allows exactly this (including mixing). It doesn't make 
> any distinction about whether the source of a MediaStream is a local 
> camera, a <video> tag, or a remote stream from a PeerConnection 
> object. So if you want to prevent this kind of thing, you need to have 
> an active method of doing so, because by default the API will allow it.

I think you need to seriously consider the security implications here. 
Any media that originates from somewhere other than a local camera that 
has given permission or a local microphone that has given permission 
needs to be marked as not sendable elsewhere.
>
>> Not to mention all the protocol-level implications of being an RTP
>> mixer, if we're trying to stay true to that particular choice of 
>> protocols.
>
> That's a good point, and it's important to think about what the 
> implications of those are, especially for a ProcessedMediaStream. This 
> is not something I, personally, have thought all the way through yet.

Agree, though less of an issue if it isn't possible.

Matthew Kaufman