GnuTLS/NSS interop in Exim 4.80 RC

[Phil Pennock]

On 2012-05-20 at 16:24 +0200, Nikos Mavrogiannopoulos wrote:
>  From what I can tell it is the client for some reason terminates the
> connection. What is the output on the client? Do you have a tcpdump of
> the issue? Have you tried alternative priority strings than normal
> [0]?
> 
> [0]. http://www.gnu.org/software/gnutls/manual/html_node/Interoperability.html

Janne Snabb has done better detective work than I and found that NSS has
a hard-coded clamp on the number of DH bits used for ephemeral D-H and
GnuTLS's return value from gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH,
GNUTLS_SEC_PARAM_NORMAL) is over that limit.

I'll add a clamp option to Exim and default it to the current NSS limit.

Thanks,
-Phil