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Re: [saag] [tsvwg] Fwd: Last Call: <draft-ietf-tsvwg-transport-encrypt-19.txt> (Considerations around Transport Header Confidentiality, Network Operations, and the Evolution of Internet Transport Protocols) to Informational RFC

"C. M. Heard" <heard@pobox.com> Thu, 11 February 2021 19:11 UTC

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From: "C. M. Heard" <heard@pobox.com>
Date: Thu, 11 Feb 2021 11:10:42 -0800
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To: Fernando Gont <fgont@si6networks.com>
Cc: Tom Herbert <tom@herbertland.com>, Gorry Fairhurst <gorry@erg.abdn.ac.uk>, "tsvwg@ietf.org" <tsvwg@ietf.org>, Benjamin Kaduk <kaduk@mit.edu>, "saag@ietf.org" <saag@ietf.org>, Fernando Gont <fernando@gont.com.ar>
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Subject: Re: [saag] [tsvwg] Fwd: Last Call: <draft-ietf-tsvwg-transport-encrypt-19.txt> (Considerations around Transport Header Confidentiality, Network Operations, and the Evolution of Internet Transport Protocols) to Informational RFC
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On Thu, Feb 11, 2021 at 10:41 AM Fernando Gont <fgont@si6networks.com> wrote:
>
> On 11/2/21 15:18, Tom Herbert wrote:
> [...]
> >
> > When the transport layer is encrypted, network devices would only see
> > the plaintext EH and that is only what that is what they can act on.
> > At the destination, we could try to rectify transport information in
> > HBH with decrypted plaintext transport headers, but I suspect that
> > wouldn't typically be done. The HBH information is only operationally
> > useful to the network, not the transport endpoints that have access to
> > the transport header.
>
> Then this is what an attacker would do:
> He/she would advertise on a HBH option something that looks sensible to
> the guy enforcing a network-based security policy, and then at transport
> would do what he/she needs to do. :-)
>
>
> e.g., HBH could advertise that my packets are directed to ports 80/443,
> while in transport they are actually directed to port, say, 22.

Wasn't this the sort of problem that AH was intended to solve?

Mike Heard

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