[Samba] How do I get an ssh client to authenticate with samba4's kerberos GSSAPI? [Solved]

Ritter, Marcel - RRZE marcel.ritter at rrze.fau.de
Wed Jul 11 00:32:49 MDT 2012

Hi Quinn,

I just tried your solution (my machine is also multi-homed). However it
doesn't work for me. The man-page of sshd_config also states, that the
behavior of "GSSAPIStrictAcceptorCheck" may depend on the used
krb5 libraries.

Could you please have a look at the krb5 and openssh versions you're
using (and perhaps the linux distribution/version)?

BTW: I'm running:
	 Ubuntu 12.04 LTS
	openssh-server 5.9p1-5ubuntu1
	libkrb5-3 1.10+dfsg~beta1-2ubuntu0.1

auth.log mentions (during failed login):
	Unspecified GSS failure.
	Minor code may provide more information:
	Wrong principal in request


-----Ursprüngliche Nachricht-----
Von: samba-bounces at lists.samba.org [mailto:samba-bounces at lists.samba.org] Im Auftrag von Quinn Plattel
Gesendet: Dienstag, 10. Juli 2012 16:08
An: samba
Betreff: Re: [Samba] How do I get an ssh client to authenticate with samba4's kerberos GSSAPI? [Solved]


I solved my ssh GSSAPI problem.  There were a lot of solutions on google referring to a proper fqdn in the /etc/hosts file and having the fqdn's/principals in the kerberos server's keytab file but I found out that my problem was that the samba4/kerberos server was running on a multi-homed machine and that the ssh server kerberos authentication needed the following parameter in order for it to work on multi-homed machines:

GSSAPIStrictAcceptorCheck no

The default is yes, using "no" will, according to the manpage "clients may authenticate against any service key stored in the machine's default store."

I hope this helps others that have similar setups as I do.

Thank you all for your input.

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