Debugging why KRB5_KTNAME isn't working

[Brian J. Murrell]

On Thu, 2022-01-27 at 20:31 +0100, Jochen Kellner wrote:
> 
> I once configured postfix to uses sasl:
> 
> main.cf:83:smtpd_sasl_auth_enable = yes

I do have that already.

> And in  /etc/postfix/sasl/smtpd.conf:

Hrm.  I don't have this file.  But I never did and this all worked
prior to a few days ago when the machine was upgraded from EL7 to EL8,
which unsurprisingly upgrades a lot of things in big jumps.  So maybe
this is now necessary.

Ahh.  Looking at smtpd's strace output, it seems it's looking in
/etc/sasl2/smtpd.conf on my machine and I do have that file with:

pwcheck_method: saslauthd
mech_list: gssapi plain login

> keytab: /etc/smtp.keytab

And indeed, winner winner, chicken dinner!  Adding a "keytab:
/etc/postfix/smtp.keytab" to that file is making smtpd use the correct
keytab file now.

So this must all be new behavior in some upgraded versions.

Cheers,
b.