Re: How to handle HTTP/2 negotiation failure WRT TLS

What do people think about putting advisory text (not requirements) in Security Considerations?


On 5 Feb 2014, at 12:34 pm, Rob Trace <Rob.Trace@microsoft.com> wrote:

> I am not sure this is such a no brainer.  We should not mandate implementation fallback behavior.  If an implementer would successfully negotiate HTTP 1.1 if HTTP/2 is failing, the implementer should decide how or when to fallback.  For example an implementer could decide that falling back to HTTP 1.1 and a different TLS profile is better than forcing a user to disable HTTP/2 to get to a given site.
>  
> -Rob
>  
> From: patrick.ducksong@gmail.com [mailto:patrick.ducksong@gmail.com] On Behalf Of Patrick McManus
> Sent: Monday, February 3, 2014 7:43 AM
> To: William Chan (陈智昌)
> Cc: Martin Thomson; Brian Smith; Michael Sweet; HTTP Working Group
> Subject: Re: How to handle HTTP/2 negotiation failure WRT TLS
>  
>  
>  
> 
> On Sat, Feb 1, 2014 at 4:42 PM, William Chan (陈智昌) <willchan@chromium.org> wrote:
> It's not clear to me what "this wasn't an issue" means. I'm guessing
> that means that what we have in the spec is OK and it's not necessary
> to discuss how to handle negotiation failure and just let
> implementations figure it out. That's fine by me.
> 
> I observe that as per
> http://dxr.mozilla.org/mozilla-central/source/netwerk/protocol/http/Http2Session.cpp,
> Firefox appears to hard fail. And my inclination is to enforce the
> same policy in Chromium. This will affect other implementations that
> wish to interoperate with these browsers.
> 
>  
> This seems like a no brainer to me.
> 
> HTTP/2 is negotiated via ALPN. If the server selects HTTP/2 and also does something that is non-compliant with HTTP/2 that's a protocol error, not a negotiation error.
>  
> afaict, failing to use TLS 1.2 is an example that isn't really any different than sending a data frame > 14bits long. HTTP/2 has rules - if you can't follow them then run a different protocol, right?
>  
>  
> want me/Chromium to share half-baked thoughts on stuff, that's fine
> and I will stop sharing them. Sorry for the noise.
> 
>  
> phhhbt.
> 

--
Mark Nottingham   http://www.mnot.net/

Received on Wednesday, 5 February 2014 02:31:33 UTC