lazy_expunge mangles dovecot-acl-list

[Florian Tischler]

Am Donnerstag, 12. Juni 2014, 11:53:26 schrieb Christoph Bußenius:
> Hi,
> 
> I think I found a bug in Dovecot 2.1.17 and 2.2.13.
> 
> In our setup, sometimes ACLs stop working because "dovecot-acl-list" is
> replaced by an empty file.  We found that lazy_expunge is connected to
> this.
> 
> To reproduce, create ACLs for "user1" in a folder.  Put a mail in that
> folder and expunge it, so that the folder will be created in the
> "expunged" namespace.
> 
> For instance,
> 
> # cat user1/mail/mailboxes/folder/dbox-Mails/dovecot-acl
> user=user2 keilrwts
> 
> # cat user1/mail/dovecot-acl-list
> 1350914868 folder
> 
> # doveadm -f user1w fetch -u "user1" 'guid' mailbox _EXPUNGED.\*
> 
> # ls -l user1/mail/dovecot-acl-list
> -rw------- 1 vmail vmail 0 2014-06-12 11:40 user1/mail/dovecot-acl-list
> 
> You see that we have used doveadm to list the expunged namespace, which
> has emptied the "dovecot-acl-list" file.

Hi,

tried it with dovecot-ee-2.1.17.7-1.el6 and can confirm exactly the 
behaviour!

Interestingly a doveadm acl debug recreates dovecot-acl-list:
doveadm acl debug -u user2 user/user1/Folder
...
doveadm(user2): Info: User user2 has rights: ...
doveadm(user2): Error: Mailbox not found from dovecot-acl-list, rebuilding
doveadm(user2): Info: User user1 found from ACL shared dict
doveadm(user2): Info: Retrying after rebuilds:
...

A question because you mention 2.2.13, is acl + lazy_expunge working for you 
with 2.2.13???

2.2.13 fails for me completely with unknown namespace .EXPUNGED as soon as a 
user shares a folder. (as long as nothing is shared everything is file)
Reproducible with: doveadm acl set -u user1 Folder user=user2 rights...
2.1.17: doveadm acl debug -u user2 user/user1/Folder everything is fine.
2.2.13: unknown namespace .EXPUNGED, user2 cannot login anymore.

Unfortunately I never got any feedback to this issue and therefore stick 
with 2.1.17 :-(

Florian

> Cheers,
> Christoph
> 
> 
> 
> 
> # 2.2.13: /usr/local/dovecot/etc/dovecot/dovecot.conf
> # OS: Linux 2.6.32-57-server x86_64 Ubuntu 10.04.4 LTS
> disable_plaintext_auth = no
> mail_gid = vmail
> mail_location = mdbox:~/mail
> mail_plugins = acl
> mail_uid = vmail
> namespace {
>    inbox = no
>    list = children
>    location = mdbox:%%h/mail
>    prefix = INBOX.shared.%%u.
>    separator = .
>    subscriptions = no
>    type = shared
> }
> namespace default {
>    inbox = yes
>    location =
>    prefix = INBOX.
>    separator = .
>    type = private
> }
> namespace expunged {
>    hidden = yes
>    list = no
>    location =
> mdbox:~/mail:MAILBOXDIR=expunged:SUBSCRIPTIONS=expunged-subscriptions
>    prefix = _EXPUNGED.
>    separator = .
>    subscriptions = yes
> }
> passdb {
>    args = scheme=CRYPT username_format=%u
> /usr/local/dovecot/etc/dovecot/users
>    driver = passwd-file
> }
> plugin {
>    acl = vfile
>    acl_shared_dict = file:/mail/shared-mailboxes
>    lazy_expunge = _EXPUNGED.
> }
> protocols = imap pop3
> service auth {
>    unix_listener auth-userdb {
>      group = vmail
>      mode = 0660
>    }
> }
> ssl_cert = </etc/ssl/certs/dovecot.pem
> ssl_key = </etc/ssl/private/dovecot.pem
> userdb {
>    args = /usr/local/dovecot/etc/dovecot/users
>    driver = passwd-file
> }
> protocol imap {
>    imap_client_workarounds = tb-extra-mailbox-sep
>    mail_max_userip_connections = 20
>    mail_plugins = acl imap_acl acl
> }
-- 
Florian Tischler
System Administrator
*Johann Radon Institute for Computational and Applied Mathematics (RICAM)
http://www.ricam.oeaw.ac.at/
florian.tischler at oeaw.ac.at
*Industrial Mathematics Institute
http://www.indmath.uni-linz.ac.at/
tischler at indmath.uni-linz.ac.at
http://www.ricam.oeaw.ac.at/people/page.cgi?firstn=Florian;lastn=Tischler
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