- dovecot - dovecot.org

SIGABRT on fetching mail
by Peter Nabbefeld 29 May '19

29 May '19

Hello, I've never used gdb, so I don't know why I'm running into problems using "gdb bt". Usually, I'm fetching my mail using "sudo -E getmail", but this doesn't seem to work with backtrace. :-/ Output from "dovecot -n" attached. Kind regards, Peter

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imap userdb Fatal setuid errors
by Steven Smith 28 May '19

28 May '19

I’m trying to configure dovecot lmtp in multi-user mode. My error logs are filled with messages saying that an imap process cannot do a setuid to another user: > May 21 22:28:46 imap(pid 17441 user myuser): Fatal: setuid(512(myuser) from userdb lookup) failed with euid=501(adminuser): Operation not permitted (This binary should probably be called with process user set to 512(myuser) instead of 501(adminuser)) I see that others have had similar issues, but I am not able to apply any of the fixes or workarounds to solve this issue (e.g. setting libexec/dovecot/imap as setuid-root). I’ve also tried other fixes like setting the permissions to 0777 on the userdb auth for postfix smtpd. According to the code (restrict-access.c, linked below), it appears that when a user authenticates, an imap worker process is launched that has the bid of the authenticator. When another user authenticates, this last process is used, but it does not have the permissions to perform a setuid to the new user, resulting in the Fatal error that appears in the logs. Is this a bug, or a configuration issue? I’ve posted my doveconf below. Any pointers would be greatly appreciated. Steve Related: https://serverfault.com/questions/930245/dovecot-operation-not-permitted <https://serverfault.com/questions/930245/dovecot-operation-not-permitted> https://dovecot.org/list/dovecot/2012-May/135549.html <https://dovecot.org/list/dovecot/2012-May/135549.html> https://trac.macports.org/ticket/58506 <https://trac.macports.org/ticket/58506> Code at https://github.com/dovecot/core/blob/master/src/lib/restrict-access.c <https://github.com/dovecot/core/blob/master/src/lib/restrict-access.c>: https://github.com/dovecot/core/blob/863887d4272f962926ab279ac4cf37855dd200… <https://github.com/dovecot/core/blob/863887d4272f962926ab279ac4cf37855dd200…> https://github.com/dovecot/core/blob/863887d4272f962926ab279ac4cf37855dd200… <https://github.com/dovecot/core/blob/863887d4272f962926ab279ac4cf37855dd200…> doveconf -n: > # 2.3.0.1 (ffd8a29): /opt/local/etc/dovecot/dovecot.conf > # Pigeonhole version 0.5.0.1 (d33dca20) > # OS: Darwin 18.6.0 x86_64 apfs > auth_cache_size = 10 M > auth_gssapi_hostname = $ALL > auth_krb5_keytab = /opt/local/etc/dovecot/imap.keytab > auth_mechanisms = plain gssapi > auth_realms = host.domain.tld > auth_socket_path = /opt/local/var/run/dovecot/auth-userdb > auth_username_format = %Ln > debug_log_path = /opt/local/var/log/mail/mail-debug.log > default_internal_user = _dovecot > default_login_user = _dovenull > disable_plaintext_auth = no > first_valid_gid = 6 > first_valid_uid = 6 > imap_id_log = * > imap_id_send = "name" * "version" * > imap_idle_notify_interval = 29 mins > imap_urlauth_submit_user = submit > info_log_path = /opt/local/var/log/mail/mail-info.log > last_valid_gid = 100 > lda_mailbox_autocreate = yes > log_path = /opt/local/var/log/mail/mail-err.log > login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c > mail_access_groups = mail > mail_attachment_dir = /private/var/mail/tld.domain.mail/attachments > mail_attachment_fs = sis posix:mode=0666 > mail_debug = yes > mail_gid = mail > mail_home = /private/var/mail/tld.domain.mail > mail_location = mdbox:/private/var/mail/tld.domain.mail/%Ln/mdbox > mail_log_prefix = "%s(pid %p user %u): " > mail_plugins = quota zlib acl fts fts_solr fts_lucene > mail_privileged_group = mail > mail_uid = _dovecot > 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 > mdbox_rotate_size = 200 M > namespace inbox { > inbox = yes > location = > mailbox Archive { > auto = subscribe > special_use = \Archive > } > mailbox Drafts { > auto = subscribe > special_use = \Drafts > } > mailbox Junk { > auto = create > special_use = \Junk > } > mailbox Notspam_train { > auto = create > special_use = \Junk > } > mailbox Sent { > auto = subscribe > special_use = \Sent > } > mailbox Spam_train { > auto = create > special_use = \Junk > } > mailbox Trash { > auto = create > special_use = \Trash > } > prefix = > separator = / > } > passdb { > driver = pam > name = pam > } > plugin { > fts = solr > fts_autoindex = yes > fts_autoindex_exclude = \Junk > fts_solr = url=http://127.0.0.1:8983/solr/dovecot/ > imapsieve_mailbox1_before = file:/opt/local/etc/dovecot/sieve/report-spam.sieve > imapsieve_mailbox1_causes = COPY APPEND > imapsieve_mailbox1_name = Spam_train > imapsieve_mailbox2_before = file:/opt/local/etc/dovecot/sieve/report-ham.sieve > imapsieve_mailbox2_causes = COPY APPEND > imapsieve_mailbox2_name = Notspam_train > mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename > mail_log_fields = uid box msgid from subject size flags > quota_grace = 10%% > quota_rule = *:storage=16G > quota_rule2 = Trash:storage=+256M > quota_warning = storage=100%% quota-exceeded %u > quota_warning2 = storage=80%% quota-warning %u > recipient_delimiter = + > sieve = /private/var/mail/tld.domain.mail/rules/%Ln/dovecot.sieve > sieve_after = /opt/local/etc/dovecot/sieve-after.d > sieve_before = /opt/local/etc/dovecot/sieve-before.d > sieve_dir = /private/var/mail/tld.domain.mail/rules/%Ln/%u > sieve_global_extensions = +vnd.dovecot.pipe +vnd.dovecot.environment > sieve_pipe_bin_dir = /opt/local/etc/dovecot/sieve > sieve_plugins = sieve_imapsieve sieve_extprograms > sieve_quota_max_storage = 50M > } > postmaster_address = postmaster(a)domain.tld > protocols = imap lmtp sieve > quota_full_tempfail = yes > sendmail_path = /opt/local/sbin/sendmail > service auth-worker { > user = root > } > service auth { > extra_groups = _keytabusers > idle_kill = 15 mins > unix_listener /opt/local/var/spool/postfix/private/auth { > group = mail > mode = 0660 > user = _postfix > } > } > service imap-login { > inet_listener imap { > address = 127.0.0.1, ::1 > port = 143 > } > inet_listener imaps { > port = 993 > ssl = yes > } > process_min_avail = 6 > service_count = 0 > vsz_limit = 2 G > } > service imap { > client_limit = 16 > process_limit = 200 > process_min_avail = 6 > service_count = 0 > } > service lmtp { > unix_listener /opt/local/var/spool/postfix/private/dovecot-lmtp { > group = mail > mode = 0660 > user = _postfix > } > } > ssl = required > ssl_ca = </etc/certificates/chain.pem > ssl_cert = </etc/certificates/cert.pem > ssl_cipher_list = ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256 > ssl_dh = # hidden, use -P to show it > ssl_key = # hidden, use -P to show it > ssl_min_protocol = TLSv1.2 > ssl_prefer_server_ciphers = yes > userdb { > driver = passwd > name = passwd > } > verbose_proctitle = yes > protocol lda { > mail_fsync = optimized > mail_plugins = quota zlib acl fts fts_solr fts_lucene sieve > } > protocol imap { > mail_max_userip_connections = 50 > mail_plugins = quota zlib acl fts fts_solr fts_lucene imap_acl imap_quota imap_zlib imap_sieve > } > protocol lmtp { > mail_fsync = optimized > mail_plugins = quota zlib acl fts fts_solr fts_lucene sieve > }

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ssl_dh
by ＠lbutlr 28 May '19

28 May '19

Does ssl_dh need to be manually updated each time the underlying certificate renews? -- 2+2=5 for sufficiently large values of 2.

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Hello some help on login users saying it's disabled
by Remo Mattei 28 May '19

28 May '19

Hello I am experiencing some strange issue with the dovecot, the web round cube works fine but when I try to connect with an iPhone over IMAP IMAPs it tells me that the account is disabled. Please advice here is what I see in the logs: May 25 14:30:32 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=172.10.163.251, lip=208.53.44.237, session=<4AZjBr2J2cisCqP7> May 25 14:30:32 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=172.10.163.251, lip=208.53.44.237, session=<fFVkBr2J2sisCqP7> May 25 14:30:32 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=172.10.163.251, lip=208.53.44.237, session=<TnpkBr2J28isCqP7> May 25 14:30:32 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=172.10.163.251, lip=208.53.44.237, session=<KcplBr2J3MisCqP7> May 25 14:30:34 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=172.10.163.251, lip=208.53.44.237, session=<wPiABr2J3cisCqP7> May 25 14:30:34 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=172.10.163.251, lip=208.53.44.237, session=<gDSCBr2J3sisCqP7> May 25 14:30:37 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=172.10.163.251, lip=208.53.44.237, session=<byuzBr2J4MisCqP7> May 25 14:30:37 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=172.10.163.251, lip=208.53.44.237, session=<ob20Br2J4cisCqP7> May 25 14:30:39 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=172.10.163.251, lip=208.53.44.237, session=<bUfQBr2J4sisCqP7> May 25 14:30:39 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=172.10.163.251, lip=208.53.44.237, session=<tsbRBr2J48isCqP7> And the account does not show any mail whereas the Web shows the mail just fine. Thanks

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pam authentication error?
by unknown＠example.com 28 May '19

28 May '19

Getting this: auth-worker(5045): Error: pam(kremels,xxx.xxx.xxx.xxx: pam_authenticate() failed: authentication error (/etc/pam.d/dovecot missing?) # cat /etc/pam.d/dovcot auth required pam_unix.so nullok account required pam_unix.so (file was last updated in April of 2018) passdb { username_filter = "!*@*" driver = pam } userdb { driver = passwd } service auth { unix_listener auth-userdb { } unix_listener /var/spool/postfix/private/auth { mode = 0666 } } # ls -ls /var/spool/postfix/private/auth 0 srw-rw-rw- 1 root wheel 0 May 27 13:57 /var/spool/postfix/private/auth postfix/main.cf: smtpd_sasl_authenticated_header = yes smtpd_sasl_path = private/auth smtpd_sasl_type = dovecot smtpd_starttls_timeout = 20s smtpd_tls_cert_file = /usr/local/etc/dehydrated/certs/covisp.net/fullchain.pem smtpd_tls_key_file = /usr/local/etc/dehydrated/certs/covisp.net/privkey.pem smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_security_level = may 16 -rw------- 1 root 443 4152 May 20 21:08 fullchain-1558408117.pem 0 lrwx------ 1 root 443 24 May 20 21:08 fullchain.pem -> fullchain-1558408117.pem 8 -rw------- 1 root 443 3243 May 20 21:08 privkey-1558408117.pem 0 lrwx------ 1 root 443 22 May 20 21:08 privkey.pem -> privkey-1558408117.pem

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Re: Hello some help on login users saying it's disabled
by Joseph Tam 27 May '19

27 May '19

> Hello I am experiencing some strange issue with the dovecot, the web > round cube works fine but when I try to connect with an iPhone over > IMAP IMAPs it tells me that the account is disabled. > > May 25 14:30:32 imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=... > ... It's probably the iPhone mail app trying to be clever and auto-configuring the settings for IMAP (and getting it wrong). To stop this behaviour, hardwire the iPhone IMAP parameters, then disable "Automatic manage connection". If you use SSL/TLS, this will also secure you from plaintext MITM attacks. Other oddities I've seen from Apple mail readers: 1) If you don't disable "Automatic manage connection", it will also hunt around for outgoing mail settings. 2) Once in a while, it initiates an idle authenticated SMTP session (i.e. authenticates, but does nothing). 3) Roofs your user IMAP connection limit when the client does global mail searches. Joseph Tam <jtam.home(a)gmail.com>

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SIGABRT on fetching mail
by Peter Nabbefeld 27 May '19

27 May '19

Hello, I still cannot fetch my mails, relying on my smartphone (which makes it a burden to read my mails ...) - could probably somebody help me? Kind regards, Peter

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Error suggestions please
by Remo Mattei 27 May '19

27 May '19

May 25 15:01:27 imap(xxxxx(a)italy1.com)<10256><LsrOdL2J3uisCqP7>: Error: Mailbox INBOX: UID=208: read(/home/vpopmail/domains/italy1.com/xxxxx/Maildir/cur/1154731221.9257.az… failed: Cached message size smaller than expected (26421 < 26511, box=INBOX, UID=208) (read reason=mail stream) May 25 15:01:27 imap(xxxxxx(a)italy1.com)<10256><LsrOdL2J3uisCqP7>: Error: Corrupted record in index cache file /home/vpopmail/domains/italy1.com/xxxxx/Maildir/dovecot.index.cache: UID 208: Broken physical size in mailbox INBOX: read(/home/vpopmail/domains/italy1.com/xxxxx/Maildir/cur/1154731221.9257.az… failed: Cached message size smaller than expected (26421 < 26511, box=INBOX, UID=208) May 25 15:01:27 imap(xxxxxx(a)italy1.com)<10256><LsrOdL2J3uisCqP7>: Panic: file istream.c: line 315 (i_stream_read_memarea): assertion failed: (old_size <= _stream->pos - _stream->skip) Can someone tell help on how to fix this issue. Thanks

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Unknown error message
by Jerry 26 May '19

26 May '19

dovecot 2.3.6 (7eab80676) FreeBSD 12.0-RELEASE-p5 amd64 I have recently been finding error messages similar to the following in my Dovecot log file: May 26 06:58:32 imap(gerard(a)seibercom.net)<87791><WvXT+LyJHBCubeH6>: Error: stat(/var/mail/vmail/seibercom.net/gerard/.dovecot.sieve/tmp) failed: Not a directory The message is correct as there is no such directory. The question is why has it suddenly started appearing? I checked my maillog file, and there are no messages being transmitted to Dovecot when that error message is created. Neither is there any mail with that ID number either. Could this be someone attempting to hack into my system? Thanks! -- Jerry

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Automatically subscribe to the INBOX folder
by glts 26 May '19

26 May '19

Hello, I am using the ‘auto = subscribe’ feature in the mailbox configuration section in the usual fashion (as shown in conf.d/15-mailboxes.conf): namespace inbox { inbox = yes mailbox Drafts { special_use = \Drafts auto = subscribe } ... } When I connect to an account with the Thunderbird mail client, those mailboxes/folders get autocreated and autosubscribed. Good! INBOX, however, does not get subscribed to automatically. When I look at the account’s subscriptions in Thunderbird, all folders are subscribed, except INBOX. How can I enable autosubscribe for the INBOX folder (like the other folders)? Is there an option for this? This is in Dovecot 2.2.22. Cheers, David

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