Re: [secdir] SECDIR review of draft-ietf-mpls-forwarding-06

Stephen Kent <kent@bbn.com> Wed, 05 February 2014 21:30 UTC

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Date: Wed, 05 Feb 2014 16:30:19 -0500
From: Stephen Kent <kent@bbn.com>
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Cc: swallow@cisco.com, samante@apple.com, cpignata@cisco.com, kireeti@juniper.net, secdir <secdir@ietf.org>, agmalis@gmail.com, curtis@occnc.com, rcallon@juniper.net, Adrian Farrel <adrian@olddog.co.uk>, Loa Andersson <loa@pi.nu>, Stewart Bryant <stbryant@cisco.com>
Subject: Re: [secdir] SECDIR review of draft-ietf-mpls-forwarding-06
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Curtis,

I agree; the new text is better.

Thanks,

Steve
> In message <52F249B4.6020301@bbn.com>;
> Stephen Kent writes:
>> Curtis,
>>   
>> Thanks for the quick reply.
>>   
>> I agree that a thorough summary of the relevant security considerations
>> from the many normative references would be a non-trivial task ;-).
>> The brief summary you assembled is excellent!
>>   
>> I am satisfied with the changes/responses.
>>   
>> Steve
>
> Steve,
>
> If you don't mind I'd like to add a little to this.  This is the very
> last paragraph and follows the numbered list.
>
>   OLD PROPOSED
>
>     MPLS security including data plane security is discussed in greater
>     detail in [RFC5920] (MPLS/GMPLS Security Framework).
>
>   NEW PROPOSED
>
>     MPLS security including data plane security is discussed in greater
>     detail in [RFC5920] (MPLS/GMPLS Security Framework).  THe MPLS-TP
>     security framework [RFC6941] build upon this, focusing largely on
>     the MPLS-TP OAM additions and OAM channels with some attention
>     given to using network management in place of control plane setup.
>     In both security framework documents MPLS is assumed to run within
>     a "trusted zuone", defined as being where a single service provider
>     (SP) has total operational control over that part of the network.
>
>     If control plane security and management plane security are
>     sufficiently robust, compromise of a single network element may
>     result in chaos in the data plane anywhere in the network through
>     denial of service attacks, but not a Byzantine security failure in
>     which other network elements are fully compromised.
>
>     MPLS security, or lack of, can affect whether traffic can be
>     misrouted and lost, or intercepted, or intercepted and reinserted
>     (a man-in-the-middle attack) or spoofed.  End user applications,
>     including control plane and management plane protocols used by the
>     SP, are expected to make use of appropriate end-to-end
>     authentication and where appropriate end-to-end encryption.
>
> I think the original, while not incorrect, was too brief.  This new
> text provides a better summary, indicating the underlying "trusted
> zuone" assumption and the lack of any meaningful data plane security
> if that underlying assumption proves invalid for any reason, but most
> likely invalid due to a breach or a physical intercept along
> transmission media.
>
> Please let me know if this further change is an improvement or if we
> should leave it out (or change it).
>
> Curtis
>