Re: [TLS] A la carte handshake negotiation
Ilari Liusvaara <ilari.liusvaara@elisanet.fi> Mon, 15 June 2015 15:21 UTC
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Date: Mon, 15 Jun 2015 18:21:45 +0300
From: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
To: Hubert Kario <hkario@redhat.com>
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References: <201506122145.13790.davemgarrett@gmail.com> <8295853.kIc6eIqDrM@pintsize.usersys.redhat.com> <20150615135023.GA28680@LK-Perkele-VII> <4377771.p3nGbdM9qk@pintsize.usersys.redhat.com>
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Subject: Re: [TLS] A la carte handshake negotiation
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On Mon, Jun 15, 2015 at 04:30:16PM +0200, Hubert Kario wrote: > On Monday 15 June 2015 16:50:23 Ilari Liusvaara wrote: > > On Mon, Jun 15, 2015 at 03:36:44PM +0200, Hubert Kario wrote: > > > > > > there's a difference between having messages which are optional from > > > protocol standpoint but are mandatory for given ciphersuite and messages > > > which are optional always > > > > Well, the former are what I called "context-sensitive". And presence or > > absence of those can be inferred from the past handshake. > > yes, and I'm saying we should be careful not to introduce ones which can not > be inferred from previous messages > > putting ECDH_anon or ECDHE_PSK behind ECDHE_ECDSA_* ciphersuites makes this > likely Unfortunately, things get nasty when considering extensions that introduce new handshake messages. Especially if you have multiple such things trying to put messages in the same "slot": Scanning TLS registeries and relevant RFCs, I found 7: client_certificate_url(2) uses certificate_url(21) This extension is somewhat dangerous. status_request(5) uses certificate_status(22) Obsoleted by status_request_v2 user_mapping(6) uses supplemental_data(23) Dunno about this. client_authz(7) uses supplemental_data(23) Infamous. server_authz(8) -> supplemental_data(23) Infamous. status_request_v2(17) -> certificate_status(22) This one looks to be in actual use. SessionTicket TLS(35) -> NewSessionTicket(4) Related to resumption in TLS 1.0-1.2 The slots these messages go is (apparently): certificate_url: Replaces certificate certificate_status: Immediately after certificate supplemental_data: Immediately before certificate NewSessionTicket: Immediately before server CCS. -Ilari
- 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