Re: [Sip] draft-state-sip-relay-attack-00
"Dale Worley" <dworley@nortel.com> Fri, 06 March 2009 19:41 UTC
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From: Dale Worley <dworley@nortel.com>
To: Nils Ohlmeier <lists@ohlmeier.org>
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Organization: Nortel Networks
Date: Fri, 06 Mar 2009 14:41:59 -0500
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Cc: sip@ietf.org
Subject: Re: [Sip] draft-state-sip-relay-attack-00
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On Thu, 2009-03-05 at 14:40 +0100, Nils Ohlmeier wrote: > One thing which is not that obvious but is implictly a requirement for the > attack: the proxies has to challenge in-dialog requests. I do not see a > big benefit in challeging in-dialog requests as these are hopefully > rejected by the remote side if no matching dialog exists. If the UA would > know that his proxy does not challenge in-dialog requests it could simply > ignore the challenge :-) Except that there are legitimate uses for challenging in-dialog requests: sipX uses it to allow a phone to transfer a caller to any destination that the executing phone has permission to call. The first step of this process is that when the executing phone sends a REFER, the proxy challenges the REFER so that the executing phone attaches its credentials to the REFER. The proxy then analyzes these credentials to determine the user that is responsible for the transfer operation, etc. Without the in-dialog challenge, there is no way for the proxy to determine the user that is responsible for transfer operation. Dale
- Re: [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- Re: [Sip] draft-state-sip-relay-attack-00 Michael Procter
- Re: [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- Re: [Sip] draft-state-sip-relay-attack-00 Dan Wing
- Re: [Sip] draft-state-sip-relay-attack-00 Theo Zourzouvillys
- Re: [Sip] draft-state-sip-relay-attack-00 Jan Janak
- Re: [Sip] draft-state-sip-relay-attack-00 Michael Procter
- Re: [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- Re: [Sip] draft-state-sip-relay-attack-00 Nils Ohlmeier
- Re: [Sip] draft-state-sip-relay-attack-00 Theo Zourzouvillys
- Re: [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- Re: [Sip] draft-state-sip-relay-attack-00 Dan Wing
- Re: [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- Re: [Sip] draft-state-sip-relay-attack-00 Theo Zourzouvillys
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Theo Zourzouvillys
- Re: [Sip] draft-state-sip-relay-attack-00 Dale Worley
- Re: [Sip] draft-state-sip-relay-attack-00 Nils Ohlmeier
- Re: [Sip] draft-state-sip-relay-attack-00 Theo Zourzouvillys
- Re: [Sip] draft-state-sip-relay-attack-00 Nils Ohlmeier
- Re: [Sip] draft-state-sip-relay-attack-00 Jan Janak
- Re: [Sip] draft-state-sip-relay-attack-00 Jan Janak
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Jan Janak
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Victor Pascual Ávila
- Re: [Sip] draft-state-sip-relay-attack-00 Theo Zourzouvillys
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Nils Ohlmeier
- Re: [Sip] draft-state-sip-relay-attack-00 Theo Zourzouvillys
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- Re: [Sip] draft-state-sip-relay-attack-00 Nils Ohlmeier
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- Re: [Sip] draft-state-sip-relay-attack-00 Scott Lawrence
- Re: [Sip] draft-state-sip-relay-attack-00 Hadriel Kaplan
- Re: [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- Re: [Sip] draft-state-sip-relay-attack-00 Nils Ohlmeier
- Re: [Sip] draft-state-sip-relay-attack-00 Victor Pascual Ávila
- Re: [Sip] draft-state-sip-relay-attack-00 Nils Ohlmeier
- Re: [Sip] draft-state-sip-relay-attack-00 Jonathan Rosenberg
- Re: [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- Re: [Sip] draft-state-sip-relay-attack-00 Jonathan Rosenberg
- Re: [Sip] draft-state-sip-relay-attack-00 Nils Ohlmeier
- Re: [Sip] draft-state-sip-relay-attack-00 Raphael Coeffic
- Re: [Sip] draft-state-sip-relay-attack-00 Victor Pascual Ávila
- Re: [Sip] draft-state-sip-relay-attack-00 Jiri Kuthan