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Re: Discussion of 9.2.2

From: Jason Greene <jason.greene@redhat.com>
Date: Fri, 26 Sep 2014 09:55:45 -0500
Cc: HTTP Working Group <ietf-http-wg@w3.org>, Michael Sweet <msweet@apple.com>
Message-Id: <67BE9032-4441-46DE-8929-A25E4FEF3CCF@redhat.com>
To: Eric Rescorla <ekr@rtfm.com>, Martin Thomson <martin.thomson@gmail.com>, Mark Nottingham <mnot@mnot.net>
Has there been any discussion and buy-in with the major TLS implementers (OpenSSL, LibreSSL, Microsoft, NSS, etc) about the need to provide a characteristic-based priority and introspection API that also allows for different policies per TLS version? 

According to Michaels investigation it looks like all of them fall short of this. At a minimum we should at least have a commitment that a complete solution meeting the needs of future ciphers, legacy compatibility, and the rules of 9.2.2 will even be possible. While this still falls short of “working code”, there is at least a chance that it can be implemented without breaking standard industry usage patterns.

On Sep 26, 2014, at 7:17 AM, Michael Sweet <msweet@apple.com> wrote:

> I think the lead-in paragraph (everything below only applies to TLS 1.2) is confusing when the first item after it then says "this isn't just limited to TLS 1.2".  Since all of the others are now explicitly TLS 1.2 requirements you can probably drop that lead-in paragraph to avoid the confusion...
> 
> And FWIW I still have no interoperable way to implement these restrictions in a client or server that supports both HTTP/1.1 and HTTP/2 with the current TLS libraries, so I'll have to use the sub-optimal negotiate-and-then-give-up-forcing-a-new-connection approach if I want to enforce the 9.2.2 cipher suite and minimum TLS version requirements.
> 
>> On Sep 26, 2014, at 1:08 AM, Martin Thomson <martin.thomson@gmail.com> wrote:
>> 
>> On 24 September 2014 12:17, Mark Nottingham <mnot@mnot.net> wrote:
>>> <http://http2.github.io/http2-spec/#rfc.section.9.2.2>
>> 
>> I've updated my pull request on this subject.  There are a few
>> editorial changes in the mix, but the commit log shows exactly what
>> changes are involved:
>> 
>> https://github.com/http2/http2-spec/pull/615
>> 
>> I believe that these changes resolve the issues people have raised.
>> That is, other than the one which states we shouldn't have this
>> section at all.
>> 
> 
> _________________________________________________________
> Michael Sweet, Senior Printing System Engineer, PWG Chair
> 
> 

--
Jason T. Greene
WildFly Lead / JBoss EAP Platform Architect
JBoss, a division of Red Hat
Received on Friday, 26 September 2014 14:56:26 UTC

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