Interoperability issue with The Bat (Debian Bug #316522)

Marc Haber mh+gnutls-devel at
Thu Jan 3 01:24:58 CET 2008


Simon Josefsson has suggested to me (a member of the maintainer team
for Exim's packages for the Debian Operating System) that it might be
a good idea to move a technical debate from our blogs
to gnutls-devel as this list is a better medium for archived discussion.

I'll send a dedicated mail for each of Debian's bug reports, so that
the threads are not going to intermix.

Debian Bug #316522,

Simon writes:
>  When the email client TheBat talks with exim4 4.50-8, gnutls (in
>  exim4) will log (gnutls_handshake): An error was encountered at the
>  TLS Finished packet calculation. Other clients than TheBat reportedly
>  works. An older version of Exim4, specifically 4.32-2, worked though.
>  It is unclear whether the version of GnuTLS changed when exim4 was
>  upgraded from 4.32-2 to 4.50-8.

Unfortunately, I wasn't able to find out which GnuTLS library exim4
4.32-2 was compiled against since is incomplete
here. 4.32-4 was built for Debian on April 26, 2004.

Exim 4.50-8 in Debian has a binary depends on libgnutls11 (>= 1.0.16).

>  There is no discussion of whether changing to OpenSSL would solve the
>  problem. Conclusion: The problem with TheBat warrants debugging.
>  However, this do not seem to be a widely reported problem. Further,
>  TheBat is not free software so we cannot help debug it. Questions:
>  The reported said earlier versions worked, which GnuTLS versions was
>  this? Can the problem be pin-pointed to a specific GnuTLS release or
>  Exim4 release? Does the problem go away with OpenSSL?

Can you ask these questions to the submitter on the BTS?

It might be possible (judging from that The Bat by default
refuses to talk TLS to a server presenting a self-signed certificate.


Marc Haber         | "I don't trust Computers. They | Mailadresse im Header
Mannheim, Germany  |  lose things."    Winona Ryder | Fon: *49 621 72739834
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