LDA ignores virtual mailbox settings

[Toni Mueller]

Hi Aki,

On Sun, Dec 27, 2020 at 09:18:25PM +0200, Aki Tuomi wrote:
> > On 27/12/2020 18:19 Toni Mueller <support at oeko.net> wrote:
> > 
> > 16:04:16 postfix/qmgr[4970]: 8CD6CE072E: from=<user at example.com>, size=880, nrcpt=1 (queue active)
> > 16:04:16 dovecot: auth: Debug: master in: USER#0111#011user at example.com#011service=lda
> > 16:04:16 dovecot: auth: Debug: prefetch(user at example.com): passdb didn't return userdb entries, trying the next userdb
> > 16:04:16 dovecot: auth: Debug: sql(user at example.com): SELECT '/path-to-mailboxen/' || virtual_users.home AS home, uid , gid , quota as quota_rule FROM virtual_users WHERE email = 'user at example.com' AND status = 'A'
> > 16:04:16 dovecot: auth: Debug: userdb out: USER#0111#011user at example.com#011home=/path-to-mailboxen/example.com/user#011uid=12345#011gid=12345#011quota_rule=*:storage=0
> > 
> > ^^^^^^^^^^^^^^^^^^^^^^
> > 
> > This shows that the database lookup works. The intended effect should be
> > that the message is delivered to
> > 
> > /path-to-mailboxen/example.com/user/Maidir/new
> > 
> > 16:04:16 dovecot: lda(user at example.com)<5291><DDxBHYCw6F+rFAAApiCoHg>: Error: setegid(privileged) failed: Operation not permitted
> > 16:04:16 dovecot: lda(user at example.com)<5291><DDxBHYCw6F+rFAAApiCoHg>: Error: Mailbox INBOX: open(/var/mail/user at example.com) failed: Permission denied (euid=12345(mailbox) egid=12345(mailbox) missing +w perm: /var/mail, we're not in group 8(mail), dir owned by 0:8 mode=0775)
> > 
> > ^^^^^^^^^^^^^^^^^^^^^^
> > 
> > And this shows that dovecot-lda just ignores the result.
> > 
> > 
> > 16:04:16 dovecot: lda(user at example.com)<5291><DDxBHYCw6F+rFAAApiCoHg>: Error: Mailbox INBOX: Failed to autocreate mailbox: Mailbox INBOX: open(/var/mail/user at example.com) failed: Permission denied (euid=12345(mailbox) egid=12345(mailbox) missing +w perm: /var/mail, we're not in group 8(mail), dir owned by 0:8 mode=0775)
> > 16:04:16 dovecot: lda(user at example.com)<5291><DDxBHYCw6F+rFAAApiCoHg>: msgid=<20201226224933.014608 at laptop.example.com>: save failed to open mailbox INBOX: Mailbox INBOX: Failed to autocreate mailbox: Mailbox INBOX: open(/var/mail/user at example.com) failed: Permission denied (euid=12345(mailbox) egid=12345(mailbox) missing +w perm: /var/mail, we're not in group 8(mail), dir owned by 0:8 mode=0775)
> > 16:04:16 postfix/pipe[5284]: 8CD6CE072E: to=<user at example.com>, orig_to=<userA at example2.com>, relay=dovecot, delay=62083, delays=62083/0.04/0/0.04, dsn=4.3.0, status=deferred (temporary failure)
> > 
> > 
> > In /etc/postfix/master.cf, I have this to call it:
> > 
> > dovecot   unix  -       n       n       -       -       pipe
> >   flags=DRhu user=_mailbox argv=/usr/lib/dovecot/deliver -f ${sender} -d ${user}@${domain} -a ${recipient}
> > 
> Try adding
> 
> mail_privileged_group = mail

I am not sure why you recommend this. I never ever want to deliver to
/var/mail, and my mailbox directory has group 'mailbox' - hence I have

mail_privileged_group = mailbox

in my configuration.

My question is why this thing wants to deliver to /var/mail, despite
having a different location from the userdb, and how I can force it to
use the location from the userdb.


Thanks,
Toni