Re: [TLS] Fixing TLS
mrex@sap.com (Martin Rex) Thu, 14 January 2016 09:40 UTC
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To: Ilari Liusvaara <ilariliusvaara@welho.com>
Date: Thu, 14 Jan 2016 10:40:44 +0100
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From: mrex@sap.com
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Subject: Re: [TLS] Fixing TLS
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Ilari Liusvaara wrote: > > Peter Gutmann wrote: > >> Salz, Rich <rsalz@akamai.com> writes: >> >>>> TLS needs an LTS version that you can just push out and leave to its own >>>> devices >>> >>>So don't you have that with TLS 1.1 and appropriate cipher and option >>>choices? >> >> Based on the feedback I've had, I'm kinda tempted to do a TLS 1.2 LTS draft >> that specifices just a single boolean flag, "use this known-good >> configuration and not the 6.023e23 other ones and you should be good >> for the next decade or so". That can then be baked into long-term >> systems and devices and left alone while people get on with other things. > > To actually fix the known problems with TLS 1.2, you would at minimum > need a new extension, since there is currently no way to fix the broken > server authentication. One Boolean signaling is sufficent to fix all of the problems. one SCSV in the Client->Server direction and a TLS extension Boolean response in ServerHello. > > Then there are the other security fix extensions (at least three already). > Those all would need to be impiled. > > And then there is the TLS 1.2 Diffie-Hellman issue... TLS 1.2LTS should fix them all at once, including: - promise to support minimum DHE key lengths >= 2048 bits whenever ClientHello includes DHE cipher suites - promise to support a certain small subset of EC curves and uncompressed point format whenever ClientHello includes ECDHE cipher suites (but may omit TLS extensions). - new/improved ServerKeyExchange handshake message, which does not only contain the reasonable set of DHE parameters, but also uses a digititally signed covering all prior handshake messages, not just the two hello randoms. - overriding any TLS record layer protocol version and ClientHello.client_version that is less than TLSv1.2 - promise that digital signatures using SHA-256 are supported - fix the misunderstood semantics of the signature_algorithm extension so that it is only used as a hint to certificate selection, but *NEVER* seen as a hard requirement (or reason for server to abort the TLS handshake based on the signature of the server cert). -Martin
- [TLS] Fixing TLS Peter Gutmann
- Re: [TLS] Fixing TLS Dave Garrett
- Re: [TLS] Fixing TLS Yoav Nir
- Re: [TLS] Fixing TLS Ilari Liusvaara
- Re: [TLS] Fixing TLS Peter Bowen
- Re: [TLS] Fixing TLS Watson Ladd
- Re: [TLS] Fixing TLS Eric Rescorla
- Re: [TLS] Fixing TLS Dave Garrett
- Re: [TLS] Fixing TLS Peter Bowen
- Re: [TLS] Fixing TLS Eric Rescorla
- Re: [TLS] Fixing TLS Ilari Liusvaara
- Re: [TLS] Fixing TLS David Benjamin
- Re: [TLS] Fixing TLS Bill Cox
- Re: [TLS] Fixing TLS Dave Garrett
- Re: [TLS] Fixing TLS Andrei Popov
- Re: [TLS] Fixing TLS Bill Cox
- Re: [TLS] Fixing TLS Dave Garrett
- Re: [TLS] Fixing TLS Tony Arcieri
- Re: [TLS] Fixing TLS Eric Rescorla
- Re: [TLS] Fixing TLS Kurt Roeckx
- Re: [TLS] Fixing TLS Eric Rescorla
- Re: [TLS] Fixing TLS Dave Garrett
- Re: [TLS] Fixing TLS Eric Rescorla
- Re: [TLS] Fixing TLS Peter Gutmann
- Re: [TLS] Fixing TLS Watson Ladd
- Re: [TLS] Fixing TLS Martin Rex
- Re: [TLS] Fixing TLS Nikos Mavrogiannopoulos
- Re: [TLS] Fixing TLS SCHWARZ, Albrecht (Albrecht)
- Re: [TLS] Fixing TLS Hubert Kario
- Re: [TLS] Fixing TLS Hubert Kario
- Re: [TLS] Fixing TLS Dmitry Belyavsky
- Re: [TLS] Fixing TLS Hubert Kario
- Re: [TLS] Fixing TLS Hubert Kario
- Re: [TLS] Fixing TLS Peter Gutmann
- Re: [TLS] Fixing TLS Salz, Rich
- Re: [TLS] Fixing TLS Martin Rex
- Re: [TLS] Fixing TLS Peter Gutmann
- Re: [TLS] Fixing TLS Peter Gutmann
- Re: [TLS] Fixing TLS Ilari Liusvaara
- Re: [TLS] Fixing TLS Ilari Liusvaara
- Re: [TLS] Fixing TLS Martin Rex
- Re: [TLS] Fixing TLS Ilari Liusvaara
- Re: [TLS] Fixing TLS Martin Rex