[Samba] [Solved] A working CUPS authentication now fails without change anything...

[Daniel Carrasco Marín]

2015-05-12 19:45 GMT+02:00 Sketch <smblist at rednsx.org>:

> On Tue, 12 May 2015, Andrey Repin wrote:
>
>  Greetings, Daniel Carrasco Marín!
>>
>>  Hi again!!, this time is not for help request as always :P finally i've
>>> found the solution and I want to share it.
>>> The problem was just permissions. If you change the keytab permission to
>>> 644 it works perfect: chmod 644 /etc/krb5.keytab
>>> Anyway I don't understand why the daemons can't read that file when are
>>> running as root.
>>>
>>
>> Not all daemons are run as root, far from that.
>> Most of single-purpose daemons, such as cups, run as their own users.
>>
>
> Yep, this is done for security purposes so that if one process is
> compromised, it doesn't have administrative access to the rest of the
> system.
>
> In a similar vein, you don't generally want any process on the machine to
> have access to some things.  The system kerberos keytab is probably one of
> those.  If cups is running as it's own user, a better solution would be to
> either generate a new keytab just for cups, or copy the existing keytab and
> make it only readable by the cups user.
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Yes, for now keytab is compromised.

Cups calls pam authentication, and pam use winbind then I need to give
permissions to winbind daemon but i don't know what account is using that
daemon. How i can see it?, because ps aux shows the most as root.

Greetings!!