[Dovecot] fs quota backend bug

Jan Škoda lefty at multihost.cz
Sun Jan 16 14:58:59 EET 2011 

Hi,

I maintain postfix mailserver with sudo enabled dovecot LDA using
multiple uids. I want to enforce quotas per-unix-user (which can have
multiple domains with multiple emails set up using postfixadmin), so I
have set up a FS quota backend with imap_quota plugin. Unfortunately,
the quota appears to work (when i disable chrooting) according to
dovecot-info.log, but doesn't send anything over IMAP. I found several
topics related to this bug in this mailing list, but without any reply.

All files in Maildir belong to unix-user ofight (1042)

# sudo -u ofight quota
Disk quotas for user ofight (uid 1042):
     Filesystem  blocks   quota   limit    files   quota   limit
/dev/mapper/vg-home
                2058888  2150400 2365440           35432  537600  591360

Info: Loading modules from directory: /usr/lib64/dovecot/imap
Info: Module loaded: /usr/lib64/dovecot/imap/lib10_quota_plugin.so
Info: Module loaded: /usr/lib64/dovecot/imap/lib11_imap_quota_plugin.so
Info: Effective uid=1042, gid=102,
home=/home/vmail/ofight.org/team at ofight.org/
Info: Quota root: name=Kvota backend=fs args=mount=/home
Info: Namespace: type=private, prefix=, sep=., inbox=yes, hidden=no,
list=yes, subscriptions=yes
Info: maildir: data=/home/vmail/ofight.org/team at ofight.org/
Info: maildir++: root=/home/vmail/ofight.org/team at ofight.org, index=,
control=, inbox=/home/vmail/ofight.org/team at o
fight.org
Info: fs quota add storage dir = /home/vmail/ofight.org/team at ofight.org
Info: fs quota block device = /dev/mapper/vg-home
Info: fs quota mount point = /home
Info: fs quota mount type = jfs
Info: Namespace: type=private, prefix=INBOX., sep=., inbox=no,
hidden=yes, list=no, subscriptions=yes
Info: maildir: data=/home/vmail/ofight.org/team at ofight.org/
Info: maildir++: root=/home/vmail/ofight.org/team at ofight.org, index=,
control=, inbox=
Info: Namespace : Using permissions from
/home/vmail/ofight.org/team at ofight.org: mode=0700 gid=-1
Info: Disconnected: Logged out bytes=133/834

Part of IMAP conversation captured with wireshark:

getquotaroot "INBOX"
QUOTAROOT "INBOX"
Ok Getquotaroot completed

Part of strace:
read(0, "357 getquotaroot \"INBOX\"\r\n", 1259) = 26
stat("/home/vmail/ofight.org/team at ofight.org/tmp", {st_dev=makedev(253,
2), st_ino=475158, st_mode=S_IFDIR|0700, st_nlink=2, st_uid=1042,
st_gid=102, st_b
lksize=4096, st_blocks=0, st_size=1, st_atime=2011/01/16-10:07:59,
st_mtime=2011/01/16-10:07:59, st_ctime=2011/01/16-10:07:59}) = 0
stat("/home/vmail/ofight.org/team at ofight.org", {st_dev=makedev(253, 2),
st_ino=475157, st_mode=S_IFDIR|0700, st_nlink=11, st_uid=1042,
st_gid=102, st_blks
ize=4096, st_blocks=16, st_size=4096, st_atime=2009/05/18-12:07:57,
st_mtime=2011/01/16-11:36:32, st_ctime=2011/01/16-11:36:32}) = 0
stat("/home/vmail/ofight.org/team at ofight.org", {st_dev=makedev(253, 2),
st_ino=475157, st_mode=S_IFDIR|0700, st_nlink=11, st_uid=1042,
st_gid=102, st_blks
ize=4096, st_blocks=16, st_size=4096, st_atime=2009/05/18-12:07:57,
st_mtime=2011/01/16-11:36:32, st_ctime=2011/01/16-11:36:32}) = 0
stat("/home/vmail/ofight.org/team at ofight.org/dovecot-shared",
0x3f5aa9cf710) = -1 ENOENT (No such file or directory)
stat("/home/vmail/ofight.org/team at ofight.org", {st_dev=makedev(253, 2),
st_ino=475157, st_mode=S_IFDIR|0700, st_nlink=11, st_uid=1042,
st_gid=102, st_blks
ize=4096, st_blocks=16, st_size=4096, st_atime=2009/05/18-12:07:57,
st_mtime=2011/01/16-11:36:32, st_ctime=2011/01/16-11:36:32}) = 0
stat("/home/vmail/ofight.org/team at ofight.org", {st_dev=makedev(253, 2),
st_ino=475157, st_mode=S_IFDIR|0700, st_nlink=11, st_uid=1042,
st_gid=102, st_blks
ize=4096, st_blocks=16, st_size=4096, st_atime=2009/05/18-12:07:57,
st_mtime=2011/01/16-11:36:32, st_ctime=2011/01/16-11:36:32}) = 0
access("/home/vmail/ofight.org/team at ofight.org/cur", W_OK) = 0
setsockopt(1, SOL_TCP, TCP_CORK, [1], 4) = 0
write(1, "* QUOTAROOT \"INBOX\"\r\n357 OK Getq"..., 53) = 53

# 1.2.16: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-hardened-r31 x86_64 Gentoo Base System release 2.0.0 jfs
base_dir: /var/run/dovecot/
log_path: /var/log/dovecot.log
info_log_path: /var/log/dovecot-info.log
protocols: imap imaps pop3 pop3s managesieve
listen: *, [::]
ssl_cert_file: /etc/apache2/ssl/server.pem
ssl_key_file: /etc/apache2/ssl/server.key
disable_plaintext_auth: no
shutdown_clients: no
login_dir: /var/run/dovecot//login
login_executable(default): /usr/libexec/dovecot/imap-login
login_executable(imap): /usr/libexec/dovecot/imap-login
login_executable(pop3): /usr/libexec/dovecot/pop3-login
login_executable(managesieve): /usr/libexec/dovecot/managesieve-login
login_greeting: Dovecot ready. Welcome to Multihost.cz
login_process_per_connection: no
login_processes_count: 2
login_max_processes_count: 32
login_max_connections: 128
valid_chroot_dirs: /home/vmail
max_mail_processes: 150
first_valid_uid: 102
mail_uid: vmail
mail_gid: vmail
mail_location: maildir:/home/vmail/%d/%u
mail_debug: yes
mail_executable(default): /usr/libexec/dovecot/imap
mail_executable(imap): /usr/libexec/dovecot/imap
mail_executable(pop3): /usr/libexec/dovecot/pop3
mail_executable(managesieve): /usr/libexec/dovecot/managesieve
mail_plugins(default): quota imap_quota
mail_plugins(imap): quota imap_quota
mail_plugins(pop3): quota
mail_plugins(managesieve):
mail_plugin_dir(default): /usr/lib64/dovecot/imap
mail_plugin_dir(imap): /usr/lib64/dovecot/imap
mail_plugin_dir(pop3): /usr/lib64/dovecot/pop3
mail_plugin_dir(managesieve): /usr/lib64/dovecot/managesieve
imap_client_workarounds(default): outlook-idle delay-newmail
imap_client_workarounds(imap): outlook-idle delay-newmail
imap_client_workarounds(pop3):
imap_client_workarounds(managesieve):
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
pop3_client_workarounds(managesieve):
namespace:
  type: private
  separator: .
  inbox: yes
  list: yes
  subscriptions: yes
namespace:
  type: private
  separator: .
  prefix: INBOX.
  hidden: yes
  list: no
  subscriptions: yes
lda:
  postmaster_address: postmaster at multihost.cz
  mail_plugins: sieve quota
  quota_full_tempfail: yes
auth default:
  mechanisms: plain login skey
  cache_size: 256
  user: nobody
  verbose: yes
  passdb:
    driver: sql
    args: /etc/dovecot/dovecot-sql.conf
  userdb:
    driver: sql
    args: /etc/dovecot/dovecot-sql.conf
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: mail
    master:
      path: /var/run/dovecot/auth-master
      mode: 432
      user: vmail
      group: mail
plugin:
  quota: fs:Kvota:mount=/home
  trash: /etc/dovecot/trash.conf
  sieve_global_path: /etc/dovecot/global.sieve
  sieve_global_dir: /etc/dovecot/sieve-repo/

Thanks,
Lefty

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