[exim] GnuTLS / OpenSSL interop problems

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Auteur: Tony Finch
Date:  
À: exim-users
Sujet: [exim] GnuTLS / OpenSSL interop problems
I have receved a number of reports recently of TLS interop probblems
between Exim+OpenSSL and Exim+GnuTLS. Is anyone else seeing anything
similar?

My servers are running Exim 4.82 (git revision c0e5623) linked against
OpenSSL 1.0.1e.

GnuTLS clients connecting to send mail see something like:

2014-02-27 15:50:14 1WJ2vo-0004Gf-4W
    TLS error on connection to ppsw.cam.ac.uk [131.111.8.137] (recv):
    A TLS fatal alert has been received.: Bad record MAC


There are some suggestions online that this might be related to GnuTLS's
random record padding, but I thought the problems with that had been
fixed.

Tony.
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