Permission denied UNIX perms appear ok (ACL/MAC wrong?))

[Erwan David]

Le 20/08/2022 à 16:52, Austin Witmer a écrit :
> Hello all!
>
> Recently I upgraded my mail server to Ubuntu 22.04 LTS and ever since 
> then I am periodically getting some dovecot errors like the below in 
> my mail log. As far as I can tell, my unix perms are just fine. What 
> is ACL/MAC?
>
> Aug 20 14:41:58 mail dovecot: 
> imap(user at domain.com)<56316><1NieGKPmuOdKwxVI>: Error: Mailbox INBOX: 
> stat(/mnt/volume1/mailserver/plain/maildir/domain.com/user/dovecot.index.log 
> <http://domain.com/user/dovecot.index.log>) failed: Permission denied 
> (euid=1000(austin) egid=1000(austin) UNIX perms appear ok (ACL/MAC 
> wrong?))
>
> And here is the listing showing the permissions for that file.
>
> *austin at mail*:*~*$ ls -la 
> /mnt/volume1/mailserver/plain/maildir/domain.com/user/dovecot.index.log 
> <http://domain.com/user/dovecot.index.log>
> -rwxrwxr-- 1 austin austin 15796 Aug 20 14:41 
> */mnt/volume1/mailserver/plain/maildir/domain.com/user/dovecot.index.log 
> <http://domain.com/user/dovecot.index.log>*
>
> What in the world is causing these errors, and what can I do about them?
>
> Thanks in advance!
>
> Austin Witmer

Did you check wether your linux distribution uses SeLINUX or Apparmor ? 
In that case you would have to check their policy to give dovecot access 
to this directory.