RFC 6331 documents a number of serious security weaknesses in
the SASL DIGEST-MD5 mechanism. As such, libvirtd should not
by using it as a default mechanism. GSSAPI is the only other
viable SASL mechanism that can provide secure session encryption
so enable that by defalt as the replacement.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
On F17 at least, every time libvirtd starts we get this in syslog:
libvirtd: Could not find keytab file: /etc/libvirt/krb5.tab: No such file or directory
This comes from cyrus-sasl, and happens regardless of whether the
gssapi plugin is requested, which is what actually uses
/etc/libvirt/krb5.tab.
While cyrus-sasl shouldn't complain, we can easily make it shut up by
commenting out the keytab value by default.
Also update the keytab comment to the more modern one from qemu's
sasl config file.
