Re: [rtcweb] Requiring ICE for RTC calls

"Ravindran Parthasarathi" <pravindran@sonusnet.com> Mon, 26 September 2011 18:29 UTC

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Date: Tue, 27 Sep 2011 00:01:46 +0530
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Thread-Topic: [rtcweb] Requiring ICE for RTC calls
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From: "Ravindran Parthasarathi" <pravindran@sonusnet.com>
To: "Matthew Kaufman" <matthew.kaufman@skype.net>, =?utf-8?B?ScOxYWtpIEJheiBDYXN0aWxsbw==?= <ibc@aliax.net>
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Cc: Randell Jesup <randell-ietf@jesup.org>, rtcweb@ietf.org
Subject: Re: [rtcweb] Requiring ICE for RTC calls
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I'm sort of lean towards ICE or ICElite mechanism for NAT traversal of media because there is no known better mechanism. In case there is known better mechanism, Please list out for discussion.

Thanks
Partha

>-----Original Message-----
>From: rtcweb-bounces@ietf.org [mailto:rtcweb-bounces@ietf.org] On Behalf
>Of Matthew Kaufman
>Sent: Monday, September 26, 2011 9:19 PM
>To: Iñaki Baz Castillo
>Cc: Randell Jesup; rtcweb@ietf.org
>Subject: Re: [rtcweb] Requiring ICE for RTC calls
>
>On 9/26/2011 8:29 AM, Iñaki Baz Castillo wrote:
>> 2011/9/26 Matthew Kaufman<matthew.kaufman@skype.net>et>:
>>> For example, an evil overlord that creates a web site for allowing
>its
>>> clients to attack systems behind a firewall could relax those
>requirements
>>> and not mandate ICE/SRTP when opening arbitrary connections to
>systems
>>> behind said firewall.
>>>
>>> The "configuration" must be retrieved by the WebRTC client *from the
>system
>>> it will be sending traffic to*... the best format we have for that is
>to
>>> send a (rate-limited) STUN connectivity check with short-term
>credentials
>>> and see if it is replied to properly. That's how ICE works.
>> I understand your points and I agree. That would be the perfect
>scenario.
>
>That would be the only scenario that is safe enough to ship in a
>browser.
>
>> But I'm worried about the price to pay for these security constrains
>> (no interoperability with 95% of SIP-PSTN providers within next 3-5
>> years).
>
>The alternative is that you don't ship anything in the browser, because
>the browser *cannot* become an attack vector as a result of adding this
>feature.
>
>And "interoperability with SIP-PSTN providers" is only relevant if you
>are trying to turn the browser into another phone. We have enough
>phones. What we don't have are new real-time communication experiences
>that can only be created within this environment.
>
>Matthew Kaufman
>
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