Re: [secdir] SecDir review of draft-ietf-tsvwg-rsvp-l3vpn-02
Magnus Westerlund <magnus.westerlund@ericsson.com> Thu, 03 September 2009 17:48 UTC
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Date: Thu, 03 Sep 2009 11:55:40 +0200
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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To: Francois Le Faucheur IMAP <flefauch@cisco.com>
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Cc: Gorry Fairhurst <gorry@erg.abdn.ac.uk>, Bruce Davie <bsd@cisco.com>, secdir@ietf.org, iesg@ietf.org, Ashok Narayanan <ashokn@cisco.com>, James Polk <jmpolk@cisco.com>
Subject: Re: [secdir] SecDir review of draft-ietf-tsvwg-rsvp-l3vpn-02
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Hi, I haven't seen any follow up on this discussion. Can Stefan and Francois please come to conlusion on what to do? Cheers Magnus Francois Le Faucheur IMAP skrev: > Hello Stefan, > > Thanks for your review. Please find a response to your question embedded > below: > > On 23 Jun 2009, at 18:51, Stefan Santesson wrote: > >> I have reviewed this document as part of the security directorate's >> ongoing effort to review all IETF documents being processed by the >> IESG. These comments were written primarily for the benefit of the >> security area directors. Document editors and WG chairs should treat >> these comments just like any other last call comments. >> >> This specification define a set of procedures to overcome challenges >> with deployment of Resource Reservation Protocols over BGP/MPLS VPNs. >> >> The BGP/MPLS VPN (RFC 4364) is a VPN technique that doesn't rely >> encryption to ensure secrecy or message integrity. The security >> properties are instead dependent on the security of the network >> infrastructure. >> >> It appears that this draft makes a serious effort to describe and >> analyze relevant security considerations. With my limited expertise in >> this particular area I can't find any thing that is obviously missing. >> >> However, one question that comes to my mind, which might be worth >> looking at from a security perspective, is whether the procedures >> introduced by this document requires the communication to be >> unencrypted and if so, whether deployment of this protocol blocks or >> prevents legitimate use of e.g. IPsec based VPN as discussed in RFC >> 4364 and RFC 4023. If this is the case, should it be discussed in the >> security considerations section? > > The short answer is that this document does not require that > communication be un-encrypted. > > The longer answer would be: > > RFC4364 mentions use of IPsec both CE-CE and PE-PE: > Specifically, I noticed: "Cryptographic privacy is not provided by this > architecture, nor by Frame Relay or ATM VPNs. These architectures are > all compatible with the use of cryptography on a CE-CE basis, if that is > desired. The use of cryptography on a PE-PE basis is for further study." > > Regarding PE-PE IPsec: > * RSVP over VPN would work just fine (as currently specified) for PE-CE > links > * RSVP over VPN would not allow CAC over MPLS Core as we need TE tunnels > to do that which I believe could not be used with MPLS over IP/IPsec in > the core. > > Regarding CE-CE IPsec (or if IPsec starts deeper inside the VPN site): > RFC 4923 "Quality of Service (QoS) Signaling in a Nested Virtual Private > Network" describes a model for RSVP operation through IPsec Gateways (in > a nutshell, the idea is that there is effectively a form of hierarchical > RSVP where an RSVP reservation is made for the IPsec tunnel and then > individual RSVP reservations are admitted/aggregated over the tunnel > reservation). This would apply in case to the case of CE-CE IPsec (or if > IPsec starts deeper inside the VPN site) and the procedures defined in > the document would simply apply "as is" to the reservation for the > tunnel(s) (and not to the individual end to end RSVP reservation). > > If this answers your question appropriately, we could add text capturing > this in the Security Considerations (whenever we issue the next rev). > Please let us if this works for you. > > Thanks > > Francois > >> >> >> *Stefan Santesson >> *AAA-sec.com >> >> >> >> >> > -- Magnus Westerlund IETF Transport Area Director ---------------------------------------------------------------------- Multimedia Technologies, Ericsson Research EAB/TVM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden| mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- [secdir] SecDir review of draft-ietf-tsvwg-rsvp-l… Stefan Santesson
- Re: [secdir] SecDir review of draft-ietf-tsvwg-rs… Francois Le Faucheur IMAP
- Re: [secdir] SecDir review of draft-ietf-tsvwg-rs… Magnus Westerlund
- Re: [secdir] SecDir review of draft-ietf-tsvwg-rs… Magnus Westerlund