GnuTLS/NSS interop in Exim 4.80 RC

[Nikos Mavrogiannopoulos]

On Mon, May 21, 2012 at 1:17 AM, Phil Pennock
<help-gnutls-phil at spodhuis.org> wrote:
> 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.

That's very interesting. Our key sizes is according to recommendations
like ECRYPT [0]. What is the NSS limit? Did you report it to the NSS
people?

[0]. http://www.keylength.com/en/3/

regards,
Nikos