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Re: [tram] Transport of ICMP errors in TURN

Simon Perreault <sperreault@jive.com> Thu, 27 August 2015 14:23 UTC

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To: "Cullen Jennings (fluffy)" <fluffy@cisco.com>, "Tirumaleswar Reddy (tireddy)" <tireddy@cisco.com>
References: <55DD94FF.7080400@acm.org> <55DDB133.6090608@jive.com> <A8F8D0A4-C847-4F3E-B5A3-45DA47CB95D9@cisco.com> <913383AAA69FF945B8F946018B75898A478C7C70@xmb-rcd-x10.cisco.com> <44C024B4-CAC6-4E3A-A812-793809449E10@cisco.com>
From: Simon Perreault <sperreault@jive.com>
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Date: Thu, 27 Aug 2015 10:23:09 -0400
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Cc: Marc Petit-Huguenin <petithug@acm.org>, "Pal Martinsen (palmarti)" <palmarti@cisco.com>, "tram@ietf.org" <tram@ietf.org>
Subject: Re: [tram] Transport of ICMP errors in TURN
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Le 2015-08-27 09:49, Cullen Jennings (fluffy) a écrit :
> 
> A key part of TURN design was that it was not usable for running
> general purpose server that accepted traffic from anyone without
> first identifying who it is that you want to get the traffic from. So
> the client has to tell the TURN server which external hosts can send
> it traffic.
> 
> Receiving ICMP violates this because you would need to accept stuff
> from sources you had not given permission to send you stuff. That
> allows TURN to be used to build generic servers which allows it to
> circumvent firewall policy. One of the reasons we invented TURN
> instead of using one of the other tunnel protocols was to not have
> this problem.

Good point.

That is easily solved by having the TURN server enforce permissions on
the 5-tuple of the ICMP error's encapsulated original packet. Exactly
the same way stateful firewalls do it.

Simon

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