Re: [kitten] draft-hansen-scram-sha256 and incorporating session hashing for channel binding
Simon Josefsson <simon@josefsson.org> Thu, 28 May 2015 15:11 UTC
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Date: Thu, 28 May 2015 17:11:22 +0200
From: Simon Josefsson <simon@josefsson.org>
To: Nico Williams <nico@cryptonector.com>
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Subject: Re: [kitten] draft-hansen-scram-sha256 and incorporating session hashing for channel binding
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> > You then go on to say: "Personally, I would prefer to change to > > another mandatory channel binding that is secure for all TLS > > versions." > > This is not really appropriate here because it's the applications that > need to do this, and we can't say anything here about this that will > force them to. > A reference to TLS-SESSION-HASH of the same level (i.e., normative > or informative) as RFCs 5246 and 5929 would be nice. I believe that what is required is 1) scram-sha256 has a normative reference to tls-session-hash; or 2) tls-session-hash uses an Update: that makes it applicapable to all TLS versions, and that it is clarified (if not already the case) that tls-session-hash must be used; or 3) scram-sha256 uses a new channel binding that is secure with or without tls-session-hash. I believe 1) and 2) would be worse than 3) for the next ~5 years or so, and things being equal after that. SASL libraries/applications rarely have any influence over TLS internals, but they directly influence the channel binding used. Using another channel binding for hansen-scram-sha256 should not be difficult, as far as I can tell -- SCRAM implementations needs to be changed to support the other stuff for SCRAM-SHA256 so they could just as well be modified to support a new channel binding too. But I would not object to 1) or 2), if people prefer that. /Simon
- [kitten] AD sponsoring draft-hansen-scram-sha256 Stephen Farrell
- Re: [kitten] AD sponsoring draft-hansen-scram-sha… Peter Saint-Andre - &yet
- Re: [kitten] AD sponsoring draft-hansen-scram-sha… Tony Hansen
- Re: [kitten] AD sponsoring draft-hansen-scram-sha… Peter Saint-Andre - &yet
- Re: [kitten] AD sponsoring draft-hansen-scram-sha… Simon Josefsson
- Re: [kitten] [saag] AD sponsoring draft-hansen-sc… Simon Josefsson
- Re: [kitten] [saag] AD sponsoring draft-hansen-sc… Alexey Melnikov
- Re: [kitten] [saag] AD sponsoring draft-hansen-sc… Dave Cridland
- Re: [kitten] AD sponsoring draft-hansen-scram-sha… Simon Josefsson
- Re: [kitten] [saag] AD sponsoring draft-hansen-sc… Martin Thomson
- Re: [kitten] [saag] AD sponsoring draft-hansen-sc… Sam Whited
- Re: [kitten] [saag] AD sponsoring draft-hansen-sc… Stephen Farrell
- Re: [kitten] [saag] AD sponsoring draft-hansen-sc… Tony Hansen
- Re: [kitten] [saag] AD sponsoring draft-hansen-sc… Tony Hansen
- [kitten] draft-hansen-scram-sha256 and the hash i… Tony Hansen
- [kitten] draft-hansen-scram-sha256 and incorporat… Tony Hansen
- Re: [kitten] draft-hansen-scram-sha256 and the ha… Dave Cridland
- Re: [kitten] draft-hansen-scram-sha256 and the ha… Alexey Melnikov
- Re: [kitten] draft-hansen-scram-sha256 and the ha… Tony Hansen
- Re: [kitten] draft-hansen-scram-sha256 and the ha… Simon Josefsson
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Simon Josefsson
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Alexey Melnikov
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Simon Josefsson
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Alexey Melnikov
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Tony Hansen
- Re: [kitten] [saag] AD sponsoring draft-hansen-sc… Karthikeyan Bhargavan
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Simon Josefsson
- Re: [kitten] [saag] AD sponsoring draft-hansen-sc… Simon Josefsson
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Nico Williams
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Nico Williams
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Simon Josefsson
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Simon Josefsson
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Stephen Farrell
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Nico Williams
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Tony Hansen
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Nico Williams
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Simon Josefsson
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Tony Hansen
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Nico Williams
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Simon Josefsson
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Simon Josefsson
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Nico Williams
- Re: [kitten] draft-hansen-scram-sha256 and incorp… Tony Hansen