[bug 2.3.15] seeing user-shared mailboxes across different storage types requires manual change to subscriptions

6 Jul 2021


      Hi,
While I was checking old bug I once reported (that one seems to be
fixed, https://www.dovecot.org/list/dovecot/2017-January/106593.html) I
discovered another issue happening under current version when user
sharing his mailbox (with Maildir storage) is not visible under user
using mdbox (or sdbox, also tested) - unless subscriptions file is
manually adjusted (after subscribing).
Consider following config:
# 2.3.15 (0503334ab1): /etc/dovecot/dovecot.conf
# OS: Linux 5.12.14-arch1-1 x86_64 Arch Linux btrfs
# Hostname: hakai
auth_debug = yes
auth_mechanisms = plain login
disable_plaintext_auth = no
first_valid_uid = 1
listen = *
mail_debug = yes
mail_gid = dovecot
mail_location = maildir:/var/mail1/%n/Maildir
mail_plugins = acl
mail_uid = dovecot
namespace {
inbox = yes
location =
prefix =
separator = /
type = private
}
namespace shared1 {
inbox = no
list = yes
location = maildir:%%h/Maildir/
prefix = shared1/%%n/
separator = /
subscriptions = no
type = shared
}
namespace shared2 {
inbox = no
list = yes
location = mdbox:%%h/mdbox/
prefix = shared2/%%n/
separator = /
subscriptions = no
type = shared
}
passdb {
args = /etc/dovecot/local-maildir
driver = passwd-file
}
passdb {
args = /etc/dovecot/local-mdbox
driver = passwd-file
}
plugin {
acl = vfile
acl_shared_dict = file:/var/mail-data/shared-database/shared-mailboxes.db
}
protocols = imap
service auth {
unix_listener auth-userdb {
group = mail
mode = 0660
user = dovecot
}
user = dovecot
}
service imap-login {
inet_listener imap {
address = *
port = 143
}
inet_listener imaps {
address = *
port = 993
}
user = dovecot
}
service imap {
executable = /usr/lib/dovecot/imap
}
userdb {
driver = prefetch
}
userdb {
args = /etc/dovecot/local-maildir
driver = passwd-file
}
userdb {
args = /etc/dovecot/local-mdbox
driver = passwd-file
}
protocol imap {
mail_max_userip_connections = 100
mail_plugins = acl imap_acl
}
/etc/dovecot/local-maildir:
user1:{PLAIN}test:::user1:/var/mail1/user1::userdb_mail=maildir:/var/mail1/user1/Maildir
userdb_home=/var/mail1/user1
user2:{PLAIN}test:::user2:/var/mail1/user2::userdb_mail=maildir:/var/mail1/user2/Maildir
userdb_home=/var/mail1/user2
/etc/dovecot/local-mdbox:
user3:{PLAIN}test:::user3:/var/mail2/user3::userdb_mail=mdbox:/var/mail2/user3/mdbox
userdb_home=/var/mail2/user3
There are two shared namespaces - shared1 for Maildir mailboxes and
shared2 for mdbox ones. 'user1' is sharing his 'qwer' folder to user3.
doveadm mailbox create -u user1 -s qwer
doveadm acl add -u user1 qwer user=user3 read lookup
doveadm mailbox subscribe -u user3 shared1/user1/qwer
This produces subscriptions file such as:
14:44 # cat /var/mail2/user3/mdbox/subscriptions
V       2
Trash
shared1	user1	qwer
With all that in place, 'qwer' won't be visible to user3. But if we
change the 'shared1	user1	qwer' to shared1/user1/qwer - then everything
will be working fine.
Sharing mdbox folder to maildir user (user3 -> user1) as well as maildir
to maildir (user1 -> user2) works without issues.

Michal Soltys

Michal Soltys

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