Re: GnuTLS versions 2.9.7 and later breaks libsoup (epiphany)

[Andreas Metzler]

On 2010-06-08 Nikos Mavrogiannopoulos <address@hidden> wrote:
> Andreas Metzler wrote:
> > Hello,
> > this is http://bugs.debian.org/576339
>
> > With GnuTLS versions 2.9.7 and later epiphany is unable to load https
> > sites. Reproducing this is very easy on Debian/unstable
> > (+experimental)

> > sudo apt-get install epiphany-browser
> > sudo apt-get install libgnutls26=2.9.11-1
> > epiphany-browser https://db.debian.org/
 
> > epiphany simply gets stuck, resending the same request again and
> > again. GnuTLS 2.9.6 and earlier (including 2.8.x) are fine.

> Hi,
>  The problem seems to be the support for TLS 1.2. It seems that epiphany
> sets a priority string of "NORMAL:!VERS-TLS1.1:!VERS-TLS1.0". Thus the
> allowed versions are now TLS 1.2 and SSL 3.0. The servers do not support
> TLS 1.2 thus falling back to TLS 1.0 which is not supported.

Shouldn't GnuTLS fall back to the supported protocol (SSL 3.0) in that
case instead of getting stuck?

> A quick fix
> would be to add !VERS-TLS1.2 to epiphany (I have no idea where it is).

The respective code seems to be in libsoup
libsoup2.4-2.30.1/libsoup/soup-gnutls.c
and the explaining comment points to 
http://bugzilla.gnome.org/show_bug.cgi?id=581342 as reason. Apparently
epiphany experienced breakage with SSL 3.0 only servers
(www.paypal.com).

While changing the respective initialisation from

gnutls_priority_set_direct (session, "NORMAL:!VERS-TLS1.1:!VERS-TLS1.0", NULL)
to
gnutls_priority_set_direct (session, "NORMAL", NULL)

makes https://db.debian.org/ accessible again with GnuTLS 2.9.7,
it also breaks connecting to https://www.paypal.com/. Not really a
solution.

cu andreas
-- 
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