Re: [TLS] A la carte handshake negotiation
Viktor Dukhovni <ietf-dane@dukhovni.org> Fri, 12 June 2015 17:22 UTC
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Date: Fri, 12 Jun 2015 17:22:00 +0000
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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References: <201506111558.21577.davemgarrett@gmail.com> <201506121236.18304.davemgarrett@gmail.com> <20150612165558.GZ2050@mournblade.imrryr.org> <201506121309.26874.davemgarrett@gmail.com>
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Subject: Re: [TLS] A la carte handshake negotiation
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On Fri, Jun 12, 2015 at 01:09:26PM -0400, Dave Garrett wrote: > On Friday, June 12, 2015 12:55:59 pm Viktor Dukhovni wrote: > > I still don't understand preclude as a matter of principle negotiation > > of ECDH_anon with AEAD if DH_anon with the same bulk cipher would > > be allowed. Once we have separate negotiation of the key exchange, > > surely ECDH_anon can be one of the supported key exchange variants, > > and then take advantage of all the available bulk ciphersuites. > > EC/FF may be negotiated separately, but a suite still needs to be selected. > Anon cannot be negotiated via an ECDHE_ECDSA suite, as the signatures > extension explicitly prohibits proposing anon alongside actual signatures. > One way or another, anon needs its own suites to be used. The extension definition can presumably be updated in a way that allows peers that support additional code-points to treat one of those as being "anon". Is the current definition really a serious obstacle to solving the problem in a properly orthogonal way. > > Or does this proposal simply compress the client HELLO message, > > but the server is still ultimately selecting the same all-in-one > > ciphersuite (thus requiring Nico's new code points for ECDH_anon > > with AEAD)? > > The server still needs to select a suite. If it selects an ECDHE_ECDSA > suite, then it can negotiate EC/FF and RSA,DSA,ECDSA with extensions. It > cannot negotiate anon. To do so would require either an ECDH_anon or > DH_anon suite be negotiated. Yes, the preferred route is to require Nico's > ECDH_anon codepoints for AEAD ciphers. With an ECDH_anon suite, the groups > extension can be used to negotiate EC/FF. What I was stating earlier is > that we could theoretically do so with DH_anon if we wanted to, but I > would much rather the ECDH_anon draft be resurrected and passed as it > would avoid confusion and the appearance of contradiction. So be it I guess. I wish it were simpler... -- Viktor.
- Re: [TLS] A la carte handshake negotiation Hubert Kario
- [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Viktor Dukhovni
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Eric Rescorla
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Viktor Dukhovni
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Viktor Dukhovni
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Viktor Dukhovni
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Aaron Zauner
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Aaron Zauner
- Re: [TLS] A la carte handshake negotiation Viktor Dukhovni
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Viktor Dukhovni
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- [TLS] ECDH_anon I-D (was: A la carte handshake ne… Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Salz, Rich
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Salz, Rich
- Re: [TLS] A la carte handshake negotiation David Benjamin
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation David Benjamin
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Viktor Dukhovni
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Eric Rescorla
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Eric Rescorla
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Hubert Kario
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Eric Rescorla
- Re: [TLS] A la carte handshake negotiation Hubert Kario
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Hubert Kario
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation David Benjamin
- Re: [TLS] A la carte handshake negotiation David Benjamin
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation David Benjamin
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Daniel Kahn Gillmor
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation David Benjamin
- Re: [TLS] A la carte handshake negotiation Daniel Kahn Gillmor
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation Peter Gutmann
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation Nico Williams
- Re: [TLS] A la carte handshake negotiation Manuel Pegourie-Gonnard
- Re: [TLS] A la carte handshake negotiation Eric Rescorla
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Dave Garrett
- Re: [TLS] A la carte handshake negotiation Kyle Rose
- Re: [TLS] A la carte handshake negotiation Martin Thomson
- Re: [TLS] A la carte handshake negotiation Ilari Liusvaara
- Re: [TLS] A la carte handshake negotiation Peter Gutmann
- Re: [TLS] A la carte handshake negotiation Kyle Rose
- Re: [TLS] A la carte handshake negotiation Peter Gutmann