samba - Feb 2023 - Kerberos settings

Hello listers

In our environment there have been some changes in AD to what I think might be
default Kerberos settings for tickets

ticket_lifetime has been shortened from 24 hrs (default?) to 10 hrs

renew_lifetime has been set at 7d from a default of no limit?

If this makes sense, just wondering if Samba needs to be aware of this
(smb.conf: include system krb5 conf = yes)?, which is the default but I had been
using "no" for this .. and then adjust those lines in /etc/krb5.conf?

We see a situation where users appear to lose their drive mapping after some
period of time where it was working fine, and it made me wonder if it could be
related to Kerberos ticket expiration

When they re-map the drive after the disconnect smbstatus shows two sessions for
the same user from the same machine to a single share

Thanks,

Robert Vaughan



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On 27/02/2023 15:20, Vaughan, Robert J via samba wrote:
> Hello listers
> 
> In our environment there have been some changes in AD to what I think might
be default Kerberos settings for tickets
> 
> ticket_lifetime has been shortened from 24 hrs (default?) to 10 hrs
> 
> renew_lifetime has been set at 7d from a default of no limit?
Can you describe your environment a little better ? I ask because, as 
far as I am aware, your changes have always been the defaults.
> 
> If this makes sense, just wondering if Samba needs to be aware of this
(smb.conf: include system krb5 conf = yes)?, which is the default but I had been
using "no" for this .. and then adjust those lines in /etc/krb5.conf?
I do not understand why you have been doing that, it is only supposed to 
affect Samba DC's built with MIT
> 
> We see a situation where users appear to lose their drive mapping after
some period of time where it was working fine, and it made me wonder if it could
be related to Kerberos ticket expiration
Do you have 'winbind refresh tickets = yes' set in smb.conf ?

Rowland