- dovecot - dovecot.org

[Dovecot] Proxying Authentication on both sides
by Andy Dills 30 Mar '12

30 Mar '12

I've recently set up a director proxy environment on my test servers, with the intention of deploying on our cluster soon. One thing I found confusing in the proxying documentation [1] was the first bit about their being two ways to do the authentication...either you have the proxy forward the auth to the real server for authentication, or you have the proxy authenticate it and then login to the real server with a master password. Well, we use /bin/checkpassword authentication which hooks into a variety of subsytems for various specific customer needs, and sometimes we need to know the username AND password of the user in order to determine their home directory information. So, using a master password (which requires the back-end server not getting the user password) is out. However, when we have the front-end server do a static director proxy, the problem is that authentication failures are logged on the back-end server with a source IP of the proxy, and no authentication failure with the client IP address is logged on the proxy. So, fail2ban (which is a MUST these days, at least for us) will not be able to properly filter out the brute force attackers. My solution was an alternative: I authenticate with our /bin/checkpassword on the proxy, which authenticates the user and only at that point returns the proxy=y nopassword=y switch to proxy the connection and forward the authentication. As a result, we get logs on the proxy for failed attempts, and the full username and password is supplied to the back-end server for proper processing. Food for thought in case anybody else is implementing this. Thanks, Andy [1] http://wiki2.dovecot.org/PasswordDatabase/ExtraFields/Proxy --- Andy Dills Xecunet, Inc. www.xecu.net 301-682-9972 ---

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[Dovecot] Multiple instances
by Timo Sirainen 30 Mar '12

30 Mar '12

v2.1 now saves the base_dir and instance_name to /var/lib/dovecot/instances when starting up. If you have for example two instances with names "backend" and "proxy", you can then use: doveadm -i proxy proxy list instead of something like: doveadm -c /etc/dovecot-proxy/dovecot.conf proxy list The same -i parameter works for all dovecot programs. I also added a couple of new doveadm commands: # doveadm instance list path name last used running /var/run/dovecot proxy 2012-02-06 21:41:39 yes # doveadm instance remove proxy It would be possible to add commands to start/shutdown some/all instances using doveadm, but is it all that useful? I'd guess people would have their own init.d scripts anyway doing that. Anything else that could be useful related to this?

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[Dovecot] IMAP to Maildir Migration preserving UIDs?
by Gedalya 30 Mar '12

30 Mar '12

Hello all, I'm facing the need to migrate from a proprietary IMAP server to Dovecot. The migration must be as smooth and transparent as possible. The mailbox format I would want to use is Maildir++. The storage format used by the current server is unknown, and I don't look forward to trying to reverse-engineer it. This leaves me with the option of reading the mailboxes using IMAP. There are tools like offlineimap or mbsync, and they do store the UID and UIDVALIDITY info. The last piece of the puzzle is a process to properly create the dovecot-uidlist and dovecot-uidvalidity files. So far I wasn't able to find anything on this. Are there any tips? Are there any tools available to do this job, or part of it? In either case I need this done, and I'll have to create whatever I can't find available. If there isn't anything out there that I'm yet to become aware of, then I'm looking at creating something like an offlineimap post-processing routine? Any help would be much appreciated. Gedalya

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[Dovecot] Dovecot migration from any IMAP/POP3 server
by Timo Sirainen 30 Mar '12

30 Mar '12

With the latest hg version / upcoming v2.1.4 you can do a perfect migration to Maildir using imapc/pop3c backends: http://wiki2.dovecot.org/Migration/Dsync The main new feature here is the pop3-migration plugin that matches messages from IMAP and POP3 servers together, so that when dsync needs to request POP3 UIDL for some IMAP message it's actually looked up from the POP3 server.

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[Dovecot] newbie: keep getting same emails in mail client
by neuronetv 29 Mar '12

29 Mar '12

dovecot-2.0.9-2.el6_1.1.i686 I've just set up dovecot in centos 6.2 (server install) and finally got it working (kind of). I set up a unix user (not a virtual user) sent a test email to this user but in my mail client I keep getting this test email over and over again. I don't think the fault is with the email client because other emails work fine and never duplicate and I've tweaked the account settings too, so it must be something I've done wrong in the dovecot setup. Here is my dovecot.conf file: # Dovecot configuration file protocols = pop3 imap disable_plaintext_auth = no mail_location = mbox:~/mail:INBOX=/var/spool/mail/unix-username ssl_cert = </etc/pki/dovecot/certs/dovecot.pem ssl_key = </etc/pki/dovecot/private/dovecot.pem passdb { driver = pam } userdb { driver = passwd } thanks for any pointers. -- View this message in context: http://old.nabble.com/newbie%3A-keep-getting-same-emails-in-mail-client-tp3… Sent from the Dovecot mailing list archive at Nabble.com.

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[Dovecot] SIS and restoring from backups
by Charles Marcus 29 Mar '12

29 Mar '12

On 2012-03-24 7:49 AM, Timo Sirainen <tss(a)iki.fi> wrote: > This is already optionally done in v2.0+dbox. MIME attachments can be > stored in plain binary form if they can be reconstructed back into > their original form. It doesn't break any signed stuff. Hey Timo, Splitting this off into a separate thread... On the question of the existing SIS capability for attachments... have you given any thought as to how to solve the problem of restoring from backups when SIS is used? I was planning on using it initially, until I read on list that restoring from (normal disk-to-disk) backups would not work when SIS was enabled - this is obviously a deal breaker for anyone who relies on backups - which I would think would be almost everyone? Or maybe I misunderstood the problem? -- Best regards, Charles

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[Dovecot] Sieve fileinto and year/month folders.
by Xavier Beaudouin 29 Mar '12

29 Mar '12

Hi there, I am trying to move from lmtpd (lmtpd.sf.net) to dovecot sieve. One thing used by some of powerusers are archiving mail automatically with autocreated folders based on year + month. Is there any good way to make that with sieve... One example require "fileinto"; if address :is ["From", "To"] "dovecot(a)dovecot.org" { fileinto "INBOX.mls.%Y.%m.dovecot"; } This will fill any mails into INBOX.mls.2012.03.dovecot uppon receiving... I don't know if some sieve guru can tell me how to do that... ? Kind regards, Xavier

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[Dovecot] Problem about dovecot Panic
by FABIO FERRARI 29 Mar '12

29 Mar '12

Good morning, we have 2 Redhat Enterprise 5.7 machines, they are a cluster with some mail services in it (postfix and dovecot 2). The version of dovecot is dovecot-2.0.1-1_118.el5 (installed via rpm). >From last week we have this dovecot problem: suddenly dovecot doesn't accept any new connections, the dovecot.log file reports lines like these Mar 15 12:38:54 secchia dovecot: imap: Panic: epoll_ctl(add, 5) failed: Invalid argument Mar 15 12:38:54 secchia dovecot: imap: Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0 [0x36ea436de0] -> /usr/lib64/dovecot/libdovecot.so.0 [0x36ea436e3a] -> /usr/lib64/dovecot/ libdovecot.so.0 [0x36ea4362e8] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handle_add+0x118) [0x36ea441498] -> /usr/lib64/dovecot/libdovecot.so.0(io_add+0x8f) [0x36ea440b7f] -> /usr/li b64/dovecot/libdovecot.so.0(master_service_init_finish+0x1c6) [0x36ea430c16] -> dovecot/imap(main+0x10a) [0x41773a] -> /lib64/libc.so.6(__libc_start_main+0xf4) [0x36ea01d994] -> dovecot/ imap [0x408179] Mar 15 12:38:54 secchia dovecot: master: Error: service(imap): child 14514 killed with signal 6 (core dumps disabled) Mar 15 12:38:54 secchia dovecot: master: Error: service(imap): command startup failed, throttling Mar 15 12:39:50 secchia dovecot: imap-login: Error: master(imap): Auth request timed out (received 0/12 bytes) Mar 15 12:39:51 secchia dovecot: imap-login: Error: master(imap): Auth request timed out (received 0/12 bytes) Mar 15 12:39:51 secchia dovecot: imap-login: Error: master(imap): Auth request timed out (received 0/12 bytes) Mar 15 12:39:52 secchia dovecot: imap-login: Error: net_connect_unix(imap) failed: Resource temporarily unavailable Mar 15 12:39:52 secchia dovecot: imap-login: Error: net_connect_unix(imap) failed: Resource temporarily unavailable Mar 15 12:39:52 secchia dovecot: imap-login: Error: master(imap): Auth request timed out (received 0/12 bytes) Mar 15 12:39:53 secchia dovecot: imap-login: Error: net_connect_unix(imap) failed: Resource temporarily unavailable Mar 15 12:39:53 secchia dovecot: imap-login: Error: net_connect_unix(imap) failed: Resource temporarily unavailable Mar 15 12:39:54 secchia dovecot: imap-login: Error: net_connect_unix(imap) failed: Resource temporarily unavailable Mar 15 12:39:54 secchia dovecot: imap: Error: Login client disconnected too early Mar 15 12:39:54 secchia dovecot: imap: Error: Login client disconnected too early Mar 15 12:39:54 secchia dovecot: imap: Error: Login client disconnected too early Mar 15 12:39:54 secchia dovecot: imap: Error: Login client disconnected too early Mar 15 12:39:55 secchia dovecot: imap: Panic: epoll_ctl(add, 5) failed: Invalid argument and the kern.log file reports Mar 15 12:38:52 secchia kernel: dlm: closing connection to node 1 Mar 15 12:39:04 secchia kernel: lpfc 0000:83:00.0: 1:(0):2753 PLOGI failure DID:010400 Status:x9/x32900 Mar 15 12:39:04 secchia kernel: lpfc 0000:03:00.0: 0:(0):2753 PLOGI failure DID:010400 Status:x9/x32900 Mar 15 12:41:14 secchia kernel: lpfc 0000:03:00.0: 0:(0):2753 PLOGI failure DID:010400 Status:x9/x32900 Mar 15 12:41:15 secchia kernel: lpfc 0000:83:00.0: 1:(0):2753 PLOGI failure DID:010400 Status:x9/x32900 Mar 15 12:42:11 secchia kernel: dlm: got connection from 1 can you help us? thanks in advance Fabio Ferrari

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[Dovecot] dsync is SLOW compared to rsync
by Jeff Gustafson 29 Mar '12

29 Mar '12

Hi all, We are currently using snapshots and rsync to backup a large mail server to a backup mail server. I have been looking into using dsync to replace rsync in hopes that it would make backups more efficient. I decided to test the performance using a single mailbox. Unfortunately dsync seems to run much slower than rsync. Rsync was able to sync the mailbox in 2 seconds. dsync took over a minute. The test was run so that the source and destination are on the same filesystem. We would like to using the new replication system, but that doesn't seem likely since the performance of the underlying dsync is so much slower than rsync. Even with the extra work that dsync is doing I can't believe the difference in performance would be that great. I realize that dsync is actively being worked on and I hope bringing attention to performance issue will provoke some ideas on how to improve it. Here is the output of the tests using dovecot 2.1.3: [root@n24 bu]# du -hs /home/10.0.1.101/1009/users/testuser% domain.com/Maildir/ 517M /home/10.0.1.101/1009/users/testuser%domain.com/Maildir/ [root@n24 bu]# time rsync -va /home/10.0.1.101/1009/users/testuser% domain.com/Maildir/ . sending incremental file list Maildir/ Maildir/dovecot-uidlist [ ... deleted cruft ... ] Maildir/cur/1332387577.M381054P27635.n24,S=14215502,W=14448554:2, Maildir/new/ Maildir/tmp/ sent 540927820 bytes received 1222 bytes 216371616.80 bytes/sec total size is 540855755 speedup is 1.00 real 0m2.677s user 0m3.184s sys 0m1.513s [root@n24 bu]# time dsync backup -u testuser(a)domain.com \ mdbox:/home/bu/testuser real 1m9.519s user 1m7.592s sys 0m1.126s [root@n24 bu]# time dsync backup -u testuser(a)domain.com \ sdbox:/home/bu/testuser2 real 1m2.164s user 1m0.882s sys 0m0.993s [root@n24 bu]#

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[Dovecot] Dovecot 1.2.9 Crash, NFS
by Müller Lukas 28 Mar '12

28 Mar '12

Hi, I'm stuck with a problem we have with dovecot. My suspicion is, that it has to do with accessing the same mailbox/mail stored on a NFS-share from two machines at the same time. setup We have to mail servers running, both run a Ubuntu 10.04, Postfix 2.70 and Dovecot 1.2.9. The mailboxes are stored in maildir format on a NFS-Share. In front of those to mail servers we have a load balancer. Unfortunately it can't be set up to use the same server for each domain, but it uses the same server for the same source-ip for at least 1 hour. Here is the output of dovecot -n: # 1.2.9: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-33-server x86_64 Ubuntu 10.04.3 LTS nfs log_timestamp: %Y-%m-%d %H:%M:%S protocols: imap imaps pop3 pop3s ssl_ca_file: /etc/ssl/ca-bundle/SSL123_CA_Bundle.pem ssl_cert_file: /etc/ssl/mail.newmedia.ch/mail.newmedia.ch.crt ssl_key_file: /etc/ssl/mail.newmedia.ch/mail.newmedia.ch.key ssl_verify_client_cert: yes disable_plaintext_auth: no login_dir: /var/run/dovecot/login login_executable(default): /usr/lib/dovecot/imap-login login_executable(imap): /usr/lib/dovecot/imap-login login_executable(pop3): /usr/lib/dovecot/pop3-login mail_max_userip_connections: 25 mail_privileged_group: mail mail_location: maildir:/data/vmail/%d/%n:INDEX=/data/vmail/%d/%n/indexes mmap_disable: yes dotlock_use_excl: no mail_nfs_storage: yes mail_nfs_index: yes mbox_write_locks: fcntl dotlock mail_executable(default): /usr/lib/dovecot/imap mail_executable(imap): /usr/lib/dovecot/imap mail_executable(pop3): /usr/lib/dovecot/pop3 mail_plugins(default): quota imap_quota mail_plugins(imap): quota imap_quota mail_plugins(pop3): mail_plugin_dir(default): /usr/lib/dovecot/modules/imap mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3 imap_client_workarounds(default): outlook-idle delay-newmail imap_client_workarounds(imap): outlook-idle delay-newmail imap_client_workarounds(pop3): auth default: passdb: driver: sql args: /etc/dovecot/dovecot-mysql.conf userdb: driver: passwd userdb: driver: sql args: /etc/dovecot/dovecot-mysql.conf plugin: quota: maildir:storage=409600 sieve_global_path: /data/vmail/globalsieverc dict: quotadict: mysql:/etc/dovecot-dict-quota.conf problem the problem happens with a client's mailbox that is used by multiple users. >From time to time he cannot see any Emails in the mailbox, neither with his mail clients (Apple Mail) nor with in the webmail (Roundcube). Around this time I get the following entries in the log files: Mar 6 08:26:31 mail02 dovecot: IMAP(user(a)example.com): fdatasync(/data/vmail/example.com/user/dovecot-uidlist) failed: Input/output error Mar 6 08:42:29 mail02 dovecot: IMAP(user(a)example.com): Maildir /data/vmail/example.com/user: Expunged message reappeared, giving a new UID (old uid=1522, file=1326961561.V15I4d8562M567017.mail02:2,Sad) Mar 6 08:42:29 mail02 dovecot: IMAP(user(a)example.com): Maildir /data/vmail/example.com/user: Expunged message reappeared, giving a new UID (old uid=1523, file=1326705103.V15I90105M613353.mail01:2,Sad) Mar 6 08:42:29 mail02 dovecot: IMAP(user(a)example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 4: 1326961561.V15I4d8562M567017.mail02:2,Sad (uid 1522 -> 1598) Mar 6 08:42:29 mail02 dovecot: IMAP(user(a)example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 5: 1326705103.V15I90105M613353.mail01:2,Sad (uid 1523 -> 1599) Mar 6 08:42:30 mail02 dovecot: IMAP(user(a)example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 4: 1326961561.V15I4d8562M567017.mail02:2,Sad (uid 1522 -> 1598) Mar 6 08:42:30 mail02 dovecot: IMAP(user(a)example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 5: 1326705103.V15I90105M613353.mail01:2,Sad (uid 1523 -> 1599) Mar 6 08:42:30 mail02 dovecot: IMAP(user(a)example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 4: 1326961561.V15I4d8562M567017.mail02:2,Sad (uid 1522 -> 1598) Mar 6 08:42:30 mail02 dovecot: IMAP(user(a)example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 5: 1326705103.V15I90105M613353.mail01:2,Sad (uid 1523 -> 1599) Mar 6 08:42:31 mail02 dovecot: IMAP(user(a)example.com): Maildir /data/vmail/example.com/user: Expunged message reappeared, giving a new UID (old uid=1524, file=1327500903.V15I5722c8M210039.mail01:2,Se) Mar 6 08:42:31 mail02 dovecot: IMAP(user(a)example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 6: 1327500903.V15I5722c8M210039.mail01:2,Se (uid 1524 -> 1600) Mar 6 08:42:31 mail02 dovecot: IMAP(user(a)example.com): Panic: file maildir-uidlist.c: line 403 (maildir_uidlist_records_array_delete): assertion failed: (pos != NULL) Mar 6 08:42:31 mail02 dovecot: IMAP(user(a)example.com): Raw backtrace: imap(+0xaeb5a) [0x7f37602b8b5a] -> imap(+0xaebc7) [0x7f37602b8bc7] -> imap(+0xae238) [0x7f37602b8238] -> imap(+0x497d7) [0x7f37602537d7] -> imap(maildir_uidlist_refresh+0x6f2) [0x7f37602545c2] -> imap(+0x4bb06) [0x7f3760255b06] -> imap(maildir_uidlist_sync_init+0x4d) [0x7f376025652d] -> imap(+0x46ed4) [0x7f3760250ed4] -> imap(maildir_storage_sync_init+0x147) [0x7f3760251557] -> imap(imap_sync_init+0x70) [0x7f376023b190] -> imap(+0x2411e) [0x7f376022e11e] -> imap(io_loop_handle_timeouts+0xcc) [0x7f37602c069c] -> imap(io_loop_handler_run+0x60) [0x7f37602c1000] -> imap(io_loop_run+0x18) [0x7f37602c0448] -> imap(main+0x58e) [0x7f376023bc5e] -> /lib/libc.so.6(__libc_start_main+0xfd) [0x7f375f877c4d] -> imap(+0x21979) [0x7f376022b979] Mar 6 08:42:31 mail02 dovecot: dovecot: child 16934 (imap) killed with signal 6 (core dumps disabled) Mar 6 08:42:31 mail02 dovecot: IMAP(user(a)example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 6: 1327500903.V15I5722c8M210039.mail01:2,Se (uid 1524 -> 1600) Mar 6 08:42:31 mail02 dovecot: IMAP(user(a)example.com): Panic: file maildir-uidlist.c: line 403 (maildir_uidlist_records_array_delete): assertion failed: (pos != NULL) Mar 6 08:42:31 mail02 dovecot: IMAP(user(a)example.com): Raw backtrace: imap(+0xaeb5a) [0x7ff81b415b5a] -> imap(+0xaebc7) [0x7ff81b415bc7] -> imap(+0xae238) [0x7ff81b415238] -> imap(+0x497d7) [0x7ff81b3b07d7] -> imap(maildir_uidlist_refresh+0x6f2) [0x7ff81b3b15c2] -> imap(maildir_uidlist_sync_init+0x105) [0x7ff81b3b35e5] -> imap(+0x46ed4) [0x7ff81b3aded4] -> imap(maildir_storage_sync_force+0x52) [0x7ff81b3ae392] -> imap(maildir_file_do+0x99) [0x7ff81b3b3cb9] -> imap(+0x4d944) [0x7ff81b3b4944] -> imap(index_mail_set_seq+0x148) [0x7ff81b3c8ed8] -> imap(index_storage_search_next_nonblock+0x162) [0x7ff81b3cd622] -> imap(mailbox_search_next_nonblock+0x20) [0x7ff81b3db2c0] -> imap(mailbox_search_next+0x26) [0x7ff81b3db316] -> imap(imap_fetch_more+0x2bf) [0x7ff81b39295f] -> imap(cmd_fetch+0x36c) [0x7ff81b38a9ec] -> imap(+0x28fad) [0x7ff81b38ffad] -> imap(+0x2908d) [0x7ff81b39008d] -> imap(client_handle_input+0x135) [0x7ff81b3902c5] -> imap(client_input+0x5f) [0x7ff81b390baf] -> imap(io_loop_handler_run+0xbd) [0x7ff81b41e05d] -> imap(io_loop_run+0x18) [0x7ff81b41d448] -> Mar 6 08:42:31 mail02 dovecot: IMAP(user(a)example.com): imap(main+0x58e) [0x7ff81b398c5e] -> /lib/libc.so.6(__libc_start_main+0xfd) [0x7ff81a9d4c4d] -> imap(+0x21979) [0x7ff81b388979] Mar 6 08:42:31 mail02 dovecot: dovecot: child 13712 (imap) killed with signal 6 (core dumps disabled) Mar 6 08:42:31 mail01 dovecot: IMAP(user(a)example.com): /data/vmail/example.com/user/dovecot-uidlist: Duplicate file entry at line 4: 1326961561.V15I4d8562M567017.mail02:2,Sad (uid 1522 -> 1598) Mar 6 08:42:31 mail01 dovecot: IMAP(user(a)example.com): Panic: file maildir-uidlist.c: line 403 (maildir_uidlist_records_array_delete): assertion failed: (pos != NULL) Mar 6 08:42:31 mail01 dovecot: IMAP(user(a)example.com): Raw backtrace: imap(+0xaeb5a) [0x7f4a311fcb5a] -> imap(+0xaebc7) [0x7f4a311fcbc7] -> imap(+0xae238) [0x7f4a311fc238] -> imap(+0x497d7) [0x7f4a311977d7] -> imap(maildir_uidlist_refresh+0x6f2) [0x7f4a311985c2] -> imap(+0x47023) [0x7f4a31195023] -> imap(maildir_storage_sync_init+0x147) [0x7f4a31195557] -> imap(imap_sync_init+0x70) [0x7f4a3117f190] -> imap(+0x2411e) [0x7f4a3117211e] -> imap(+0x64c0e) [0x7f4a311b2c0e] -> imap(io_loop_handle_timeouts+0xcc) [0x7f4a3120469c] -> imap(io_loop_handler_run+0x60) [0x7f4a31205000] -> imap(io_loop_run+0x18) [0x7f4a31204448] -> imap(main+0x58e) [0x7f4a3117fc5e] -> /lib/libc.so.6(__libc_start_main+0xfd) [0x7f4a307bbc4d] -> imap(+0x21979) [0x7f4a3116f979] Mar 6 08:42:31 mail01 dovecot: dovecot: child 24257 (imap) killed with signal 6 (core dumps disabled) Note: the first part is on a mail server, while the smaller second part is on the other one. Unfortunately I'm not able to reproduce this error. My suspicion/speculation what happens is the following: Multiple users are accessing the Mailbox from their offices (all on the same server), one (or more) uses the Webmail or accesses the Mailbox from a different IP. Somehow this leads to problems with Locks on NFS, which leads to the crash. I have no idea how to solve this problem and any help is greatly appreciated. If you need further information, please say so. Mit freundlichen Grüssen Lukas Müller Systems Engineer _______________________________________________ NEWMEDIA Südostschweiz Newmedia AG Kasernenstrasse 1 Postfach 508, CH-7007 Chur http://www.newmedia.ch<http://www.newmedia.ch/> _______________________________________________ TYPO3 & Drupal - Wir wissen wie. Ihre professionelle Web Agentur in Chur, Ilanz, Glarus und Zürich.

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