Re: [TLS] Confirming consensus about one
Martin Rex <mrex@sap.com> Thu, 28 January 2010 14:56 UTC
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From: Martin Rex <mrex@sap.com>
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To: ynir@checkpoint.com
Date: Thu, 28 Jan 2010 15:56:47 +0100
In-Reply-To: <02F6A83D-6FE0-4095-8523-A91C95BE1481@checkpoint.com> from "Yoav Nir" at Jan 28, 10 07:40:03 am
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Cc: DPKemp@missi.ncsc.mil, tls@ietf.org
Subject: Re: [TLS] Confirming consensus about one
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Yoav Nir wrote: > > A new version of TLS (4.0? It's time to stop explaining that > three-point-one-means-one-point-zero) would have to be certified > again anyway, so it might as well change the way Finished is > calculated. Then you don't need either SCSV or RI. > > Of course as long as you support older versions of TLS, you still > need them, but fully 4.0 handshakes will need neither SCSV nor RI. I could imagine that a part of the installed base might have an interop problems with protcol_versions where the major_number is != 0x03. (I believe ours does). In order to allow servers to perform some plausibility tests on the initial incoming data of a connection to recognize ClientHellos and distinguish them from e.g. HTTP GET/PUT/... the protocol_version at the record layer should IMHO use the lowest(!) protocol_version acceptable to the client. I'm also wondering about one thing I encountered not so long ago during interop tests: when a Server aborts a handshake while processing the initial ClientHello on a connection, there seems to be an uncertainty what protocol_version that alert will use at the record layer and from which set of available alerts it will be chosen. If possible, the protocol_version for that alert (and therefore the set of avaiable alert numbers) should --if possible-- be chosen to match a protocol version _not_ exceeding the highest protocol_version proposed by the client in client_version. There may be TLS server implementations that do not account for this yet. -Martin
- Re: [TLS] Confirming consensus about one Martin Rex
- Re: [TLS] Chatter on consensus Martin Rex
- [TLS] Confirming consensus about one draft-ietf-t… Pasi.Eronen
- Re: [TLS] Confirming consensus about one draft-ie… Robert Dugal
- Re: [TLS] Confirming consensus about one draft-ie… Dr Stephen Henson
- Re: [TLS] Confirming consensus about one draft-ie… Kemp, David P.
- Re: [TLS] Confirming consensus about one draft-ie… Paul Hoffman
- Re: [TLS] Confirming consensus about one draft-ie… Michael D'Errico
- Re: [TLS] Confirming consensus about one draft-ie… Rex, Martin
- Re: [TLS] Confirming consensus about one draft-ie… Joseph Salowey (jsalowey)
- Re: [TLS] Confirming consensus about one draft-ie… Martin Rex
- [TLS] Metadiscussion on changes in draft-ietf-tls… Paul Hoffman
- Re: [TLS] Confirming consensus about one draft-ie… Marsh Ray
- Re: [TLS] Metadiscussion on changes in draft-ietf… Martin Rex
- Re: [TLS] Confirming consensus about one draft-ie… Hovav Shacham
- Re: [TLS] Confirming consensus about one Martin Rex
- Re: [TLS] Confirming consensus about one Kemp, David P.
- Re: [TLS] Confirming consensus about one draft-ie… Nikos Mavrogiannopoulos
- Re: [TLS] Confirming consensus about one Yoav Nir
- Re: [TLS] Confirming consensus about one draft-ie… Yngve Nysaeter Pettersen
- [TLS] Chatter on consensus Kemp, David P.
- Re: [TLS] Chatter on consensus Martin Rex
- Re: [TLS] Confirming consensus about one Martin Rex
- Re: [TLS] Confirming consensus about one Nelson B Bolyard
- Re: [TLS] Confirming consensus about one Martin Rex
- Re: [TLS] Metadiscussion on changes in draft-ietf… Bob Braden
- Re: [TLS] Confirming consensus about one Michael D'Errico
- Re: [TLS] Chatter on consensus Kemp, David P.
- Re: [TLS] Confirming consensus about one Marsh Ray
- Re: [TLS] Confirming consensus about one draft-ie… Robert Relyea
- Re: [TLS] Metadiscussion on changes in draft-ietf… Martin Rex
- Re: [TLS] Metadiscussion on changes in draft-ietf… Paul Hoffman
- [TLS] interoperability and security guarantees [w… Daniel Kahn Gillmor
- Re: [TLS] Chatter on consensus Kemp, David P.
- Re: [TLS] Chatter on consensus Michael D'Errico
- Re: [TLS] Chatter on consensus Martin Rex
- Re: [TLS] Confirming consensus about one Yoav Nir
- Re: [TLS] Metadiscussion on changes in draft-ietf… Pasi.Eronen
- Re: [TLS] Metadiscussion on changes in draft-ietf… Martin Rex
- Re: [TLS] Chatter on consensus Kemp, David P.
- Re: [TLS] Confirming consensus about one Martin Rex
- Re: [TLS] Confirming consensus about one Martin Rex
- Re: [TLS] Chatter on consensus Nikos Mavrogiannopoulos
- Re: [TLS] Metadiscussion on changes in draft-ietf… Pasi.Eronen
- Re: [TLS] Metadiscussion on changes in draft-ietf… Martin Rex
- Re: [TLS] Confirming consensus about one draft-ie… Paul Hoffman
- Re: [TLS] Confirming consensus about one draft-ie… Martin Rex
- Re: [TLS] Chatter on consensus Martin Rex
- Re: [TLS] Confirming consensus about one draft-ie… Bill Frantz
- Re: [TLS] Confirming consensus about one draft-ie… tom.petch
- Re: [TLS] Confirming consensus about one draft-ie… Joseph Salowey (jsalowey)