Re: [tcpm] question about TCP-AO and rekeying
Joe Touch <touch@ISI.EDU> Thu, 18 June 2009 05:19 UTC
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Date: Wed, 17 Jun 2009 22:19:30 -0700
From: Joe Touch <touch@ISI.EDU>
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To: Eric Rescorla <ekr@networkresonance.com>
References: <4A2AB973.3030203@isi.edu> <20090616131807.75C481BC6EB@kilo.networkresonance.com> <4A37A202.9020500@isi.edu> <20090617054551.A4E0C1BCA23@kilo.networkresonance.com> <4A388C37.3030703@isi.edu> <20090617140939.A3AB61BCC72@kilo.networkresonance.com> <4A390EC0.6070003@isi.edu> <20090617161518.5276C50822@romeo.rtfm.com> <4A3917B7.20301@isi.edu> <20090617232813.1C49D50822@romeo.rtfm.com> <4A39C800.2030901@isi.edu> <20090618051622.719361BDC6B@kilo.networkresonance.com>
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Cc: tcpm Extensions WG <tcpm@ietf.org>
Subject: Re: [tcpm] question about TCP-AO and rekeying
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Eric Rescorla wrote: > At Wed, 17 Jun 2009 21:52:16 -0700, > Joe Touch wrote: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> >> >>>>> If so, the entry fails. If that's what >>>>> you mean by "prohibit overlaps", yes, I think we should >>>>> prohibit overlaps. >>>>> >>>>> If what you mean is that two MKTs with different key-ids can't overlap >>>>> the same socket pair space, I don't see a problem with that. >>>> That is a problem for outgoing SYNs. For those, either the connection >>>> has to know a-priori which ID to use, or we need to make sure MKTs can't >>>> overlap at all (ignoring keyIDs). >>> I'm sorry, but I don't see why. >> So let's consider outgoing SYNs. >> >> Consider a system with two MKTs: >> >> MKT alpha from ANY:ANY to JOE:80 KEYID=4 >> >> MKT beta from ANY:ANY to ANY:ANY KEYID=5 >> >> >> So my web client wants to connect to JOE:80. The web client has not been >> modified to indicate a desired KEYID; I doubt many apps will be so >> modified. So I'll need to ensure that the socket pair of the SYN matches >> only one MKT. >> >> That means I can't have default keys, like beta. > > Why on earth would you want to do this? The misquote Dr. Strangelove, > "the whole point of a cryptographic key is lost unless you keep it > a secret. Why would you tell the world?" > > Since almost every other machine on the Internet isn't going to > have key beta, you're going to get packets that aren't protected > with AO, in which case you'll have to discard them. Configuring > your system this way is mostly useful for breaking TCP It's a bit overgeneralized above, but clamp it down a bit more and it might still make sense, e.g.: alpha from ME:ANY to JOE:BGP KEYID=6 beta from ME:ANY to JOE:ANY KEYID=7 I.e., I may want to lock BGP with a different key than other connections between the two, but OK to use a single key for the rest. Joe -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAko5zmIACgkQE5f5cImnZrv6RACeO6qWdPaOSbNpxHvBWHnhIPOj NIkAn0Ls9Ejgfe0apGSGuNJ4b53XD6Bq =ldoM -----END PGP SIGNATURE-----
- [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Eddy, Wesley M. (GRC-MS00)[Verizon]
- Re: [tcpm] question about TCP-AO and rekeying Eric Rescorla
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch
- Re: [tcpm] question about TCP-AO and rekeying Joe Touch