October 2020 - dovecot

Re: zlib errors after upgrading to 2.3.11.3
by Robert Nowotny 14 Oct '20

14 Oct '20

On 9. Sep 2020, at 11.14, Robert Nowotny <rnowotny1966(a)gmail.com> wrote: Sep 3 08:33:25 lxc-imap dovecot: imap(mpaul)<48684><2/9E5mKuAezAqKjk>: Error: Mailbox Sent: UID=2171: read(zlib(/home/vmail/virtualmailboxes/mpaul/storage/m.119)) failed: read(/home/vmail/virtualmailboxes/mpaul/storage/m.119) failed: Broken pipe (FETCH BODY[]) Also this way you can see if the broken mail is actually xz or zstd or zlib. It would be nice to know if there are any zstd or zlib compressed mails that have problems. We did a lot of stress testing with zstd and also with xz, but haven't been able to reproduce any problems. It's also strange that it says taht the error is "Broken pipe" - that doesn't indicate that the mail is corrupted but that there is something more strange going on. So perhaps you don't actually have any mails written as corrupted, but Dovecot is just somehow having trouble reading the mails. I managed to reproduce this. The files aren't corrupted, it's just that reading is failing. The attached patch should fix the xz code and should make your files readable again. Yes, it works ! I switched now to "zstd" compression and currently re-compressing all user imap folders (one by one) Actually, with further testing it looks like the mails were written truncated. My patch simply hides the truncation when reading the mail. But it's anyway best that can be done about them. zstd also has a bug in writing compressed output, but it should always crash instead of writing broken output. We'll try to get fixes to these merged to git soon. currently I am re-compressing the mailboxes and so far i can see only one (1) Error, after about 120GB of recomresses emails : Sep 10 11:32:24 lxc-imap dovecot: imap(ebay)<37070><1aDvPvKus+/AqKjk>: Panic: file ostream.c: line 287 (o_stream_sendv_int): assertion failed: (!stream->blocking) Sep 10 11:32:24 lxc-imap dovecot: imap(ebay)<37070><1aDvPvKus+/AqKjk>: Error: Raw backtrace: /usr/local/lib/dovecot/libdovecot.so.0(backtrace_append+0x41) [0x7f5b00de6da1] -> /usr/local/lib/dovecot/libdovecot.so.0(backtrace_get+0x22) [0x7f5b00de6ec2] -> /usr/local/lib/dovecot/libdovecot.so.0(+0xfe5eb) [0x7f5b00df05eb] -> /usr/local/lib/dovecot/libdovecot.so.0(+0xfe687) [0x7f5b00df0687] -> /usr/local/lib/dovecot/libdovecot.so.0(+0x598e1) [0x7f5b00d4b8e1] -> /usr/local/lib/dovecot/libdovecot.so.0(+0x5e2c1) [0x7f5b00d502c1] -> /usr/local/lib/dovecot/libdovecot.so.0(o_stream_sendv+0x32) [0x7f5b00e14a92] -> /usr/local/lib/dovecot/libdovecot.so.0(io_stream_copy+0x5a) [0x7f5b00e1535a] -> /usr/local/lib/dovecot/libdovecot.so.0(o_stream_send_istream+0x50) [0x7f5b00e15060] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(index_storage_save_continue+0x2d) [0x7f5b00f9659d] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(dbox_save_continue+0x30) [0x7f5b00f3d3b0] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_save_continue+0x3e) [0x7f5b00f1a34e] -> dovecot/imap [ebay 192.168.168.228 APPEND](+0x13801) [0x55d6905bf801] -> dovecot/imap [ebay 192.168.168.228 APPEND](command_exec+0x6c) [0x55d6905ce3ec] -> dovecot/imap [ebay 192.168.168.228 APPEND](+0x12fdb) [0x55d6905befdb] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x6d) [0x7f5b00e06ced] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x145) [0x7f5b00e08305] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x54) [0x7f5b00e06d94] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_run+0x48) [0x7f5b00e06f08] -> /usr/local/lib/dovecot/libdovecot.so.0(master_service_run+0x17) [0x7f5b00d7f8d7] -> dovecot/imap [ebay 192.168.168.228 APPEND](main+0x459) [0x55d6905bec99] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f5b00b0e0b3] -> dovecot/imap [ebay 192.168.168.228 APPEND](_start+0x2e) [0x55d6905bed2e] Sep 10 11:32:24 lxc-imap dovecot: imap-login: Panic: epoll_ctl(del, 21) failed: Bad file descriptor Sep 10 11:32:24 lxc-imap dovecot: imap(ebay)<37070><1aDvPvKus+/AqKjk>: Fatal: master: service(imap): child 37070 killed with signal 6 (core dumps disabled - https://dovecot.org/bugreport.html#coredumps) until now I only have one broken mailbox, I need to repair (I will try that later, just finish all the other users before): Sep 10 12:13:13 lxc-imap dovecot: imap(mtrenner)<41872><KVTf0PKu7+7AqKi0>: Error: lzma.read(/home/vmail/virtualmailboxes/mtrenner/storage/m.349): corrupted data at 3763912 Sep 10 12:13:13 lxc-imap dovecot: imap(mtrenner)<41872><KVTf0PKu7+7AqKi0>: Error: Mailbox Sent: UID=1480: read(zlib(/home/vmail/virtualmailboxes/mtrenner/storage/m.349)) failed: read(/home/vmail/virtualmailboxes/mtrenner/storage/m.349) failed: lzma.read(/home/vmail/virtualmailboxes/mtrenner/storage/m.349): corrupted data at 3763912 (FETCH BODY[]) > zstd also has a bug in writing compressed output, but it should always crash instead of writing broken output. > We'll try to get fixes to these merged to git soon. Uh-Oh, that would be good ... pls notify ! how such thing can slip through the tests ? I just can not remember, the last error with compression was like 10 years ago (dont know if it was me who reported that) However, thank You for Your fast response and taking care !!! Robert

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Spam learning for rspamd
by Dan Egli 14 Oct '20

14 Oct '20

I'm quite new to Dovecot, so forgive me if this is a simple question. I've got rspamd running, and it's rewriting the subject of many messages as spam even when they are not. I've moved things out of the spam folder, which I was under the impression would teach rspamd since I've connected a sieve script that is supposed to call rspamd's learning tool, but nothing is happening. I'm really at a loss as to where to even begin searching for an answer, so any help is appreciated! -- Dan Egli On my Test server

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Procmail with Dovecot
by Dan Egli 13 Oct '20

13 Oct '20

Hey folks, here's a question. I want to enable procmail for the users so that they can have their incoming messages sorted info various folders and such regardless of MUA access or web access. I know I can set procmail to deliver to a maildir, but wouldn't that screw up dovecot's indexes? If it would, what can I do to ensure that the indexes stay correct? Thanks! -- Dan Egli On my Test server

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Fatal: setgid from userdb lookup fails with wrong gid
by Julien Beauviala 13 Oct '20

13 Oct '20

Hello all, I'm quite new as well to Dovecot, just installed it on a FreeBSD system with Postfix and Rspamd as side apps. Things are running semi-smoothly for all users but I do have quite a few errors in the logs : Oct 13 19:43:56 apollo dovecot[24478]: imap(user1)<34412><zIeI9ZCxXDmsFhZG>: Fatal: setgid(1030(user1) from userdb lookup) failed with euid=1022(user4), gid=1022(user4), egid=1022(user4): Operation not permitted (This binary should probably be called with process group set to 1030(user1) instead of 1022(user4)) Oct 13 19:43:59 apollo dovecot[24478]: imap(user1)<37376><pPS79ZCx+kasFhZG>: Fatal: setgid(1030(user1) from userdb lookup) failed with euid=1124(user3), gid=1124(user3), egid=1124(user3): Operation not permitted (This binary should probably be called with process group set to 1030(user1) instead of 1124(user3)) Oct 13 19:46:45 apollo dovecot[24478]: imap(user2)<38858><3hOk/5CxVO1dBDTq>: Fatal: setgid(1136(user2) from userdb lookup) failed with euid=1038(user5), gid=1038(user5), egid=1038(user5): Operation not permitted (This binary should probably be called with process group set to 1136(user2) instead of 1038(user5)) Oct 13 19:48:55 apollo dovecot[24478]: imap(user3)<40607><jQtWB5GxHuwKAkQ2>: Fatal: setgid(1124(user3) from userdb lookup) failed with euid=1022(user4), gid=1022(user4), egid=1022(user4): Operation not permitted (This binary should probably be called with process group set to 1124(user3) instead of 1022(user4)) There seems to be confusion. The logs are trying to be helpful but I can't quite process it. Could someone point me in the right direction ? system is used by about 60 users. Thanks, j. -- doveconf -n # 2.3.11.3 (502c39af9): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.11 (d71e0372) # OS: FreeBSD 12.1-RELEASE-p10 amd64 # Hostname: apollo.domain1.tld auth_mechanisms = plain login cram-md5 auth_username_format = %Ln mail_location = maildir:~/Maildir 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 index ihave duplicate mime foreverypart extracttext imapsieve vnd.dovecot.imapsieve 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 = type = private } passdb { args = scheme=cram-md5 /usr/local/etc/dovecot/cram-md5.pwd driver = passwd-file } plugin { imapsieve_mailbox1_before = file:/var/vmail/sieve/global/learn-spam.sieve imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_name = Spam imapsieve_mailbox2_before = file:/var/vmail/sieve/global/learn-ham.sieve imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_from = Spam imapsieve_mailbox2_name = * quota = maildir:User quota quota_exceeded_message = Benutzer %u hat das Speichervolumen überschritten. / User %u has exhausted allowed storage space. sieve = file:~/sieve;active=~/.dovecot.sieve sieve_before = /var/vmail/sieve/global/spam-global.sieve sieve_global_extensions = +vnd.dovecot.pipe sieve_pipe_bin_dir = /usr/local/bin sieve_plugins = sieve_imapsieve sieve_extprograms } postmaster_address = postmaster(a)apollo.domain1.tld protocols = imap lmtp sieve service auth { client_limit = 3000 unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0666 user = postfix } } service imap-login { service_count = 0 } service imap { process_min_avail = 4 service_count = 512 vsz_limit = 1 G } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } vsz_limit = 1 G } ssl_cert = </usr/local/etc/letsencrypt/live/apollo.domain1.tld/fullchain.pem ssl_cipher_list = EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA256:EECDH:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA:kEDH:CAMELLIA128-SHA:AES128-SHA ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it ssl_prefer_server_ciphers = yes syslog_facility = local5 userdb { driver = passwd } protocol lda { mail_plugins = sieve } protocol lmtp { mail_plugins = quota sieve postmaster_address = postmaster(a)domain1.tld } protocol imap { mail_max_userip_connections = 100 mail_plugins = " quota imap_quota imap_sieve" } local_name imap.domain2.tld { ssl_cert = </usr/local/etc/letsencrypt/live/mail.domain2.tld/fullchain.pem ssl_key = # hidden, use -P to show it } local_name mail.domain2.tld { ssl_cert = </usr/local/etc/letsencrypt/live/mail.domain2.tld/fullchain.pem ssl_key = # hidden, use -P to show it }

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Re: LMTP Authentication Error
by David Morsberger 13 Oct '20

13 Oct '20

On 2020-10-07 12:43, Alexander Dalloz wrote: > Am 07.10.2020 um 18:20 schrieb david(a)mmpcrofton.com: >> Any ideas on how to resolve the Userdb connect/lookup problem? My users are pinging me on Sieve support. >> Thanks, >> David > Provide a full output of "doveconf -n"? > Alexander Alexandar, Thanks and here you go. # 2.3.7.2 (3c910f64b): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.7.2 () # OS: Linux 5.4.0-48-generic x86_64 Ubuntu 20.04.1 LTS # Hostname: mmp-mail.mmpcrofton.com base_dir = /var/run/dovecot/ first_valid_uid = 150 login_greeting = Dovecot ready. mail_gid = 150 mail_location = mbox:~/mail:INBOX=/var/mail/%u mail_privileged_group = mail mail_uid = 150 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 index ihave duplicate mime foreverypart extracttext namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { auto = no special_use = \Sent } mailbox Spam { auto = create special_use = \Junk } mailbox Trash { auto = subscribe special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { sieve = file:/home/mail/rules/%u/;active=/home/mail/rules/%u/.dovecot.sieve sieve_dir = /home/mail/rules/%u } protocols = " imap lmtp sieve pop3 sieve" service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } ssl = required ssl_cert = </etc/letsencrypt/live/imap.mmpcrofton.com/fullchain.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it userdb { driver = prefetch } userdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } protocol lmtp { mail_plugins = " sieve" postmaster_address = david(a)mmpcrofton.com } protocol imap { mail_max_userip_connections = 50 }

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Move older messages to Old folder after a bunch of changes (sql + other stuff)
by Chris Bennett 13 Oct '20

13 Oct '20

I'm starting to get things better done now. Moved to all virtual users over IMAP. Using a SQL database for users/passwords. Setting up folders working properly with neomutt. Right now, that leaves me with just new mail in the INBOX, and other folders. I have a bunch of old mail in each users Maildirs in their real home folders. Right now, I'd like to move all the old mail into a folder (doesn't really matter what it's called). Right now is actually a perfect time to do this by good luck in timing. How should I go about creating a new folder for those messages and then adding the old mail from system user home Maildir folders to the virtual users folders I'm using? Thanks for any help, Chris Bennett

1 0

DKIM fail if WHM adds Message-ID, should be Message-Id
by Robert Martin 13 Oct '20

13 Oct '20

I created a client library to send emails for a webapp. After connecting to the SMTP server with credential setup in CPANEL, and then do NOT add Message-Id header, the DKIM signature 'h' record created by dovecot/WHM is wrong, and a Message-ID (with a capital D) header is added, invalidating the generated DKIM signature value. This causes outlook, yahoo, gmail and other email recipients to add 'dkim:fail' to the message, and thus relegate it to junk or spam. The work around is to add to the message a Message-Id with a little 'd' header. Then the SMTP server processes the email with the correct generated DKIM, correct DKIM 'h' record and does not add a Message-ID header. My SMTP hosting providers that run the WHM/dovecot/CPANEL software are refusing to raise this as a bug and have requested that I do it. Regards Robert

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Preparing for replication: dsync-local(testaccount): Panic: file mbox-lock.c
by Marc Roos 12 Oct '20

12 Oct '20

I am preparing a bit for setting up replication. However when I manually try to dsync an account, the first time I execute this[1] command it seems to be ok. The 2nd time I am getting this error[2]. If I add -1 (one way syncing) the error disappears. Does this mean I will have problems with setting up replication between these two servers? [1] [@ ~]# doveadm sync -n inbox -u testaccount tcp:mail.local:542 [2] [@ ~]# doveadm sync -n inbox -u testaccount tcp:mail.local:542 dsync-local(testaccount): Panic: file mbox-lock.c: line 799 (mbox_lock): assertion failed: (lock_type == F_RDLCK || mbox->mbox_lock_type != F_RDLCK) dsync-local(testaccount): Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0xa192e) [0x7fd4f827992e] -> /usr/lib64/dovecot/libdovecot.so.0(default_fatal_handler+0x2a) [0x7fd4f827999a] -> /usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7fd4f8209257] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mbox_lock+0xef) [0x7fd4f858feef] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mbox_save_begin+0x658) [0x7fd4f8591958] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_save_begin+0x83) [0x7fd4f855a573] -> doveadm(+0x4a6a3) [0x55e5ae8276a3] -> doveadm(dsync_mailbox_import_mail+0xca) [0x55e5ae82a9fa] -> doveadm(dsync_brain_sync_mails+0xb3) [0x55e5ae824963] -> doveadm(dsync_brain_run+0x551) [0x55e5ae820551] -> doveadm(+0x438e0) [0x55e5ae8208e0] -> doveadm(+0x5899f) [0x55e5ae83599f] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x52) [0x7fd4f828f672] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x10f) [0x7fd4f8290d5f] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x3c) [0x7fd4f828f70c] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7fd4f828f8c8] -> doveadm(+0x297c9) [0x55e5ae8067c9] -> doveadm(+0x2bdcc) [0x55e5ae808dcc] -> doveadm(+0x2c9ca) [0x55e5ae8099ca] -> doveadm(doveadm_mail_try_run+0x215) [0x55e5ae80a325] -> doveadm(main+0x46a) [0x55e5ae7f949a] -> /lib64/libc.so.6(__libc_start_main+0xf5) [0x7fd4f7e2c555] -> doveadm(+0x1c605) [0x55e5ae7f9605] Aborted CentOS Linux release 7.8.2003 (Core) dovecot-pigeonhole-2.2.36-6.el7_8.1.x86_64 dovecot-2.2.36-6.el7_8.1.x86_64

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Doveadm-Sync for sieve / control
by Marc Roos 12 Oct '20

12 Oct '20

How to dsync sieve rules and maybe other necessary files like in control?

1 0

DKIM fail if WHM adds Message-ID, should be Message-Id
by webadmin＠exalt.com.au 12 Oct '20

12 Oct '20

I created a client library to send emails for a webapp. When the client library makes a connection to the SMTP server, and then do NOT add Message-Id header, Message-ID (with a capital D) header is added, and the SMTP server adds a incorrect DKIM-Signature record 'h' part, invalidating the generated DKIM signature value. This causes outlook, yahoo, gmail and other email recipients to add 'dkim:fail' to the message which pushes it into junk/spam folder. The work around is to add to the message a Message-Id with a little ‘d’ header. Then the SMTP server processes the email with the correct DKIM-Signature, correct DKIM ‘h’ part and does not add a Message-ID header. Message-ID fails DKIM, Message-Id is better by OzBob · Pull Request #142 · dovecot/core (github.com) https://github.com/dovecot/core/pull/142 Regards Robert

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