nginx centos build only supports SSLv3 and ignores ssl_protocols[solved -- found an issue in nginx]

[Rob Stradling]

Hi.  Visit https://www.ssllabs.com/ssltest/viewMyClient.html and check 
out "Protocol Details -> Signature algorithms".  I expect you'll find 
that your browser doesn't offer SHA512/RSA.

Judging from a recent discussion on the IETF TLS list [1], there seems 
to be some confusion over whether the TLS signature_algorithms extension 
should 1) restrict the permitted certificate signature algorithms and 
the non-certificate uses of digital signatures in the TLS protocol or 2) 
only restrict the non-certificate uses of digital signatures in the TLS 
protocol.

Those taking view 2 don't offer SHA512/RSA because no cipher suites 
require it.  I've concluded that, sadly, certs signed with SHA512/RSA 
basically don't work for TLS.

[1] http://www.ietf.org/mail-archive/web/tls/current/msg13606.html

On 02/10/14 07:00, mayak wrote:
> hi all,
>
> indeed -- i generated a new set of certs and tested:
>
> a signature of sha256 results in TLSv* begin offered
> a signature of sha512 results in TLSv* _not_ being offered
> certs with 4096 bit keys work fine
>
> i suspect that there is a variable that is not long enough to support
> the signature ...
>
> thanks!
>
> m

-- 
Rob Stradling
Senior Research & Development Scientist
COMODO - Creating Trust Online