[Samba] ads_sasl_spnego_krb5_bind failed: Program lacks supportfor encryption type [SEC=UNCLASSIFIED]

Rob Townley rob.townley at gmail.com
Tue Feb 23 20:32:55 MST 2010

On Sat, Feb 13, 2010 at 8:57 PM, Jeremy Allison <jra at samba.org> wrote:
> On Sat, Feb 13, 2010 at 01:35:12PM -0600, dale at briannassaladdressing.com wrote:
>> Alex,
>> I've been a victim of this since Day 1.  After a lot of reading and emailing, it comes down to this.  libkrb5-3 version 1.8x by default disallows DES encryption.  /etc/krb5.conf can be changed to allow weak encryption, but as it relates to Samba, is only effective in letting the system join the domain.  For it's internal functioning, winbind uses an autogenerated krb5.conf that resides in /var/run/samba.  This krb5.conf has no knowledge of allow_weak_crypto=true.  Sam Hartman, the maintainer of libkrb5-3 in Debian, has taken over the responsibility of fixing that package, rather than the Samba maintainers doing a change there.  In the interim, winbind is broken with libkrb5-3 version 1.8x.  We can only hope this fix is soon coming.
> In Samba 3.5.0 there is a parameter "create krb5 conf" that controls
> if this private krb5.conf file is created or not. Would it be helpful
> for this to be back ported to earlier versions ?
> Jeremy.

    i do not want any weak encryption on my systems.

    If     "create krb5 conf = no"    in smb.conf means, that i can
specify RC4 and AES in /etc/krb5.conf and then winbind will honor and
not create a ghost krb5.conf.NEBIOSDOMAINNAME, i would greatly
appreciate it being backported.
Of course, i run CentOS 5 and that uses 3.0.33.  How far back is realistic?

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