Re: Permissions problem with mdbox maildir

[Emanuel Evans]

Emanuel Evans  writes:

> Steffen Kaiser  writes:
>
>> Could you try what happens, if you create the hardlink manually as the 
>> vmail user _two_ times, if the first link() succeeds. Maybe:
>>
>> 1) hard links won't work on your encfs,
>> 2) link() fails with "Operation not permitted" instead of "File exists" in 
>> your case, if the target file already exists.
>>
>> Something like: sudo -u vmail ln  \
>> /var/decrypted/vmail/aleme.nu/root/mailboxes/INBOX/dbox-Mails/dovecot.index \
>> /var/decrypted/vmail/aleme.nu/root/mailboxes/INBOX/dbox-Mails/dovecot.index.backup.tmp
>
> It turns out (1) was the problem—encfs doesn't allow hard links in my
> configuration. I've set maildir_copy_with_hardlinks to no; hopefully
> that will resolve the issue. Thanks so much for your help!

Unfortunately, even with maildir_copy_with_hardlinks set to "no", the
problem still seems to persist. So my question becomes: is there a way
to prevent dovecot from using hardlinks in all circumstances? (If it
isn't possible, I can change my encfs setup.)

Re: Permissions problem with mdbox maildir

[Emanuel Evans]

Steffen Kaiser  writes:

> Could you try what happens, if you create the hardlink manually as the 
> vmail user _two_ times, if the first link() succeeds. Maybe:
>
> 1) hard links won't work on your encfs,
> 2) link() fails with "Operation not permitted" instead of "File exists" in 
> your case, if the target file already exists.
>
> Something like: sudo -u vmail ln  \
> /var/decrypted/vmail/aleme.nu/root/mailboxes/INBOX/dbox-Mails/dovecot.index \
> /var/decrypted/vmail/aleme.nu/root/mailboxes/INBOX/dbox-Mails/dovecot.index.backup.tmp

It turns out (1) was the problem—encfs doesn't allow hard links in my
configuration. I've set maildir_copy_with_hardlinks to no; hopefully
that will resolve the issue. Thanks so much for your help!

Permissions problem with mdbox maildir

[Emanuel Evans]

Hi! Apologies if this has come up before, or if this is a duplicate
posting (I tried posting before but I think it got lost). Anyways, I'm
trying to set up an IMAP server with dovecot, and everything seems to be
more or less working except that I periodically see error messages like
this in my logs:

  Feb 18 01:01:15 stark dovecot: lmtp(31956, r...@aleme.nu): Error: 
link(/var/decrypted/vmail/aleme.nu/root/mailboxes/INBOX/dbox-Mails/dovecot.index,
 
/var/decrypted/vmail/aleme.nu/root/mailboxes/INBOX/dbox-Mails/dovecot.index.backup.tmp)
 failed: Operation not permitted

I'm assuming it's a permissions problem with my maildir, but I can't
figure out what the relevant process is in order to fix it. The maildir
is owned by vmail with permissions set to 700; here is the output of
dovecot -n:

  # 2.1.7: /etc/dovecot/dovecot.conf
  # OS: Linux 3.2.0-4-amd64 x86_64 Debian 7.8 fuse.encfs
  mail_gid = vmail
  mail_location = mdbox:/var/decrypted/vmail/%d/%n
  mail_uid = vmail
  managesieve_notify_capability = mailto
  managesieve_sieve_capability = fileinto reject envelope encoded-character 
vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy 
include variables body enotify environment mailbox date ihave
  namespace inbox {
inbox = yes
location = 
mailbox Drafts {
  special_use = \Drafts
}
mailbox Junk {
  special_use = \Junk
}
mailbox Sent {
  special_use = \Sent
}
mailbox "Sent Messages" {
  special_use = \Sent
}
mailbox Trash {
  special_use = \Trash
}
prefix = 
  }
  passdb {
args = /etc/dovecot/dovecot-sql.conf.ext
driver = sql
  }
  plugin {
antispam_allow_append_to_spam = no
antispam_dspam_args = --user;root;deliver=;--source=error;--client
antispam_spam = Junk
antispam_trash = Trash
sieve = ~/.dovecot.sieve
sieve_before = /var/lib/dovecot/sieve/before
sieve_dir = ~/sieve
sieve_global_dir = /var/lib/dovecot/sieve/global
  }
  protocols = " imap lmtp sieve"
  service auth {
unix_listener /var/spool/postfix/private/auth {
  group = postfix
  mode = 0660
  user = postfix
}
  }
  service imap-login {
inet_listener imaps {
  port = 993
  ssl = yes
}
service_count = 1
  }
  service lmtp {
unix_listener /var/spool/postfix/private/dovecot-lmtp {
  group = postfix
  mode = 0600
  user = postfix
}
user = vmail
  }
  ...  ...
  userdb {
args = uid=vmail gid=vmail home=/var/vmail/%d/%n
driver = static
  }
  protocol lmtp {
mail_plugins = " sieve"
  }
  protocol imap {
mail_plugins = " antispam"
  }

As you can see, I'm keeping the maildir on an encfs-encrypted volume, in
case that's relevant. Please let me know any ideas for why this might be
happening. Thanks in advance!

  Emanuel