Re: [secdir] Secdir review of draft-ietf-mpls-ldp-gtsm-07
"Rajiv Asati (rajiva)" <rajiva@cisco.com> Fri, 01 June 2012 21:28 UTC
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Date: Fri, 01 Jun 2012 16:28:28 -0500
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Thread-Topic: Secdir review of draft-ietf-mpls-ldp-gtsm-07
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From: "Rajiv Asati (rajiva)" <rajiva@cisco.com>
To: "Brian Weis (bew)" <bew@cisco.com>
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Cc: draft-ietf-mpls-ldp-gtsm.all@tools.ietf.org, The IESG <iesg@ietf.org>, secdir@ietf.org
Subject: Re: [secdir] Secdir review of draft-ietf-mpls-ldp-gtsm-07
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Hi Brian, Thanks. Will work with my co-author to get the next version submitted. Cheers, Rajiv > -----Original Message----- > From: Brian Weis (bew) > Sent: Friday, June 01, 2012 5:11 PM > To: Rajiv Asati (rajiva) > Cc: secdir@ietf.org; The IESG; draft-ietf-mpls-ldp-gtsm.all@tools.ietf.org > Subject: Re: Secdir review of draft-ietf-mpls-ldp-gtsm-07 > > Hi Rajiv, > > Your proposed text looks good to me. I think it's good to go with this added. > > Thanks, > Brian > > > On Jun 1, 2012, at 1:37 PM, Rajiv Asati (rajiva) wrote: > > > Hi Brian, > > > > Really appreciate your critical review and suggestions. > > > > I agree to your both of your suggestions, and would propose the > > following text for us to include in the next revision. > > > > > > // > > As discussed in section 3, it is possible that > > - GTSM for LDP may not always be enforced on a single-hop LDP peering > > session and may still be susceptible to forged/spoofed protocol > > packets, if the single-hop LDP peering session is set up using > > Extended Discovery. > > - GTSM for LDP may cause LDP peering session to not get established > > (or torn down), if IP routing ever declares that the directly > > connected peer is more than one hop away. > > Suffice to say, use of cryptographic integrity (e.g., RFC 5925) is > > recommended as an alternate solution for detecting forged protocol > > packets (especially for the multi-hop case). > > // > > > > Cheers, > > Rajiv > > > > > >> -----Original Message----- > >> From: Brian Weis (bew) > >> Sent: Friday, June 01, 2012 2:16 PM > >> To: secdir@ietf.org; The IESG > >> Cc: draft-ietf-mpls-ldp-gtsm.all@tools.ietf.org > >> Subject: Secdir review of draft-ietf-mpls-ldp-gtsm-07 > >> > >> 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 document applies the Generalized TTL Security Mechanism (GTSM) > >> mechanism defined in RFC 5082. This mechanism is used by routing > >> protocols as a low-cost non-cryptographic method intended to > >> frustrate > > off- > >> path attackers. It is applicable when the peer is known to be > > connected by a > >> single hop. > >> > >> The security considerations of this draft mostly point to RFC 5082's > >> extensive security considerations section, which is appropriate. > > However > >> because this I-D discusses multi-hop cases in greater detail it would > > be > >> appropriate for the security considerations section to also discuss > > multi-hop > >> a bit more. Here are some thoughts for that: > >> > >> 1) Use of cryptographic integrity (e.g., RFC 5925) should be > > recommended as > >> an alternate solution for detecting forged protocol packets in the > > multi-hop > >> case. > >> > >> 2) GTSM is expected to be enabled by default for Basic Discovery > > because > >> it's usually a single-hop, and disabled for Extended Discovery > >> because > > it's > >> usually multi-hop. But then Section 3 mentions several exceptions, > > which > >> apparently need to be administratively configured away from the > > defaults. > >> Failing to do this when needed results in security risks in either > > case: either > >> GTSM isn't deployed when it should be and the router is inadvertently > > open > >> to spoofing, or GTSM is deployed when it shouldn't be and this > >> results > > in an > >> availability issue because LDP packets will be dropped before > >> reaching > > the > >> LDP peer. This should be stated in the Security Considerations. > >> > >> Brian > >> > >> > >> > >> > >> > > > > > -- > Brian Weis > Security Standards and Technology, SRTG, Cisco Systems > Telephone: +1 408 526 4796 > Email: bew@cisco.com > > > >
- [secdir] Secdir review of draft-ietf-mpls-ldp-gts… Brian Weis
- Re: [secdir] Secdir review of draft-ietf-mpls-ldp… Brian Weis
- Re: [secdir] Secdir review of draft-ietf-mpls-ldp… Rajiv Asati (rajiva)
- Re: [secdir] Secdir review of draft-ietf-mpls-ldp… Rajiv Asati (rajiva)
- Re: [secdir] Secdir review of draft-ietf-mpls-ldp… Carlos Pignataro