April 2019 - dovecot - dovecot.org

Re: Mail account brute force / harassment
by Odhiambo Washington 11 Apr '19

11 Apr '19

All your approaches are not well thought out. The best solutions are always the simplest ones. KISS principle dictates so. On Thu, 11 Apr 2019 at 15:01, Marc Roos <M.Roos(a)f1-outsourcing.eu> wrote: > > How long have we been using the current strategy? Do we have less or > more abuse clouds operating? > > "Let the others bother with their own problems." is a bit narrow minded > view. If every one on this mailing list would have this attitude, there > would be no single answer to your question. > > > -----Original Message----- > From: Odhiambo Washington [mailto:odhiambo@gmail.com] > Sent: donderdag 11 april 2019 12:54 > To: Marc Roos > Cc: dovecot > Subject: Re: Mail account brute force / harassment > > Marc, > > There is a strategy loosely referred to as "choose your battles well" > :-) > If you can, hack the server and dump the 500GB - you'll be using > resources transferring the 500GB as the other server receives it. Two > servers wasting resources because you think you are punishing an > offender! > > > On Thu, 11 Apr 2019 at 13:43, wrote: > > > Please do not assume anything other than what is written, it is a > hypothetical situation > > > A. With the fail2ban solution > - you 'solve' that the current ip is not able to access you > - it will continue bothering other servers and admins > - you get the next abuse host to give a try. > > B. With 500GB dump > - the owner of the attacking server (probably hacked) will notice > it > will be forced to take action. > > > If abuse clouds are smart (most are) they would notice that > attacking my > servers, will result in the loss of abuse nodes, hence they will > not > bother me anymore. > > If every one would apply strategy B, the abuse problem would get > less. > Don't you agree?? > > > > > > > -----Original Message----- > From: Odhiambo Washington > Sent: donderdag 11 april 2019 12:28 > To: Marc Roos > Cc: dovecot > Subject: Re: Mail account brute force / harassment > > > > On Thu, 11 Apr 2019 at 13:24, Marc Roos via dovecot > <dovecot(a)dovecot.org> wrote: > > > > > Say for instance you have some one trying to constantly > access an > account > > > Has any of you made something creative like this: > > * configure that account to allow to login with any > password > * link that account to something like /dev/zero that > generates > infinite > amount of messages > (maybe send an archive of virusses?) > * transferring TB's of data to this harassing client. > > I think it would be interesting to be able to do such a > thing. > > > > > Instead of being evil, just use fail2ban to address this problem > :-) > > -- > > Best regards, > Odhiambo WASHINGTON, > Nairobi,KE > +254 7 3200 0004/+254 7 2274 3223 > "Oh, the cruft.", grep ^[^#] :-) > > > > > > > -- > > Best regards, > Odhiambo WASHINGTON, > Nairobi,KE > +254 7 3200 0004/+254 7 2274 3223 > "Oh, the cruft.", grep ^[^#] :-) > > > -- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254 7 3200 0004/+254 7 2274 3223 "Oh, the cruft.", grep ^[^#] :-)

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Re: Mail account brute force / harassment
by Odhiambo Washington 11 Apr '19

11 Apr '19

Marc, There is a strategy loosely referred to as "choose your battles well" :-) Let the others bother with their own problems. If you can, hack the server and dump the 500GB - you'll be using resources transferring the 500GB as the other server receives it. Two servers wasting resources because you think you are punishing an offender! On Thu, 11 Apr 2019 at 13:43, Marc Roos <M.Roos(a)f1-outsourcing.eu> wrote: > Please do not assume anything other than what is written, it is a > hypothetical situation > > > A. With the fail2ban solution > - you 'solve' that the current ip is not able to access you > - it will continue bothering other servers and admins > - you get the next abuse host to give a try. > > B. With 500GB dump > - the owner of the attacking server (probably hacked) will notice it > will be forced to take action. > > > If abuse clouds are smart (most are) they would notice that attacking my > servers, will result in the loss of abuse nodes, hence they will not > bother me anymore. > > If every one would apply strategy B, the abuse problem would get less. > Don't you agree?? > > > > > > > -----Original Message----- > From: Odhiambo Washington > Sent: donderdag 11 april 2019 12:28 > To: Marc Roos > Cc: dovecot > Subject: Re: Mail account brute force / harassment > > > > On Thu, 11 Apr 2019 at 13:24, Marc Roos via dovecot > <dovecot(a)dovecot.org> wrote: > > > > > Say for instance you have some one trying to constantly access an > account > > > Has any of you made something creative like this: > > * configure that account to allow to login with any password > * link that account to something like /dev/zero that generates > infinite > amount of messages > (maybe send an archive of virusses?) > * transferring TB's of data to this harassing client. > > I think it would be interesting to be able to do such a thing. > > > > > Instead of being evil, just use fail2ban to address this problem :-) > > -- > > Best regards, > Odhiambo WASHINGTON, > Nairobi,KE > +254 7 3200 0004/+254 7 2274 3223 > "Oh, the cruft.", grep ^[^#] :-) > > > -- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254 7 3200 0004/+254 7 2274 3223 "Oh, the cruft.", grep ^[^#] :-)

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Re: Lua Push Notification Plugin
by Sami Ketola 11 Apr '19

11 Apr '19

Hi, doveadm mailbox metadata get -u victim INBOX /private/vendor/vendor.dovecot/pvt/server/vendor/vendor.dovecot/http-notify or doveadm mailbox metadata set if you are not using appsuite as your mail frontend then you need to set the metadata manually or make sure that your mail frontend does set it. Sami > On 11 Apr 2019, at 11.50, Pabsky <j0hnw0rk3r(a)gmail.com> wrote: > > Sami, > > the package 'appsuite' is not mentioned in the documentation, also I already enabled imap metadata. > > What do you mean by 'It's not supposed to be a file. It's supposed to be a attribute on the users INBOX'? > > I'm attaching my dovecot configuration file for you to examine. Thanks Sami! > > On 11/04/2019 4:37 PM, Sami Ketola wrote: >> >> >>> On 11 Apr 2019, at 11.00, Pabsky via dovecot <dovecot(a)dovecot.org <mailto:dovecot@dovecot.org>> wrote: >>> >>> Thanks AKI! I'm a step closer to achieving my goals. >>> >>> However, I'm getting a new error as indicated from below: >>> >>> Apr 11 01:45:34 lmtp(user(a)mydomain.com <mailto:user@mydomain.com>)<20801><pVlIEJ7wrlxBUQAAUdwEFQ>: Debug: push-notification-ox: Skipped because not active (/private/vendor/vendor.dovecot/pvt/server/vendor/vendor.dovecot/http-notify METADATA not set) >>> Apr 11 01:45:34 lmtp(user(a)mydomain.com <mailto:user@mydomain.com>)<20801><pVlIEJ7wrlxBUQAAUdwEFQ>: Debug: push-notification: Push notification transaction completed >>> >>> By the way, the file /private/vendor/vendor.dovecot/pvt/server/vendor/vendor.dovecot/http-notify does not exist on my server. >> >> It's not supposed to be a file. It's supposed to be a attribute on the users INBOX. Also you need to enable imap metadata or appsuite can't set the attribute. >> >> Sami >> >> > <dovecot.conf>

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Passord change problem. (INTERNAL)
by Arvid.Eikas＠telenor.com 11 Apr '19

11 Apr '19

Hi, We have a strange problem with login after password change. We need to kill the auth_worker processes to activate the new password. It doesn't work with SIGHUP on pid, it doesn't help to run "doveadm auth cache flush". It runs flush xx but the new password still doesn't work. Are there any suggestions for how this can be resolved? Our release is 2.3.5. Arvid

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Re: Lua Push Notification Plugin
by Pabsky 11 Apr '19

11 Apr '19

Thanks AKI! I'm a step closer to achieving my goals. However, I'm getting a new error as indicated from below: Apr 11 01:45:34 lmtp(user(a)mydomain.com)<20801><pVlIEJ7wrlxBUQAAUdwEFQ>:*Debug: push-notification-ox: Skipped because not active (/private/vendor/vendor.dovecot/pvt/server/vendor/vendor.dovecot/http-notify METADATA not set)* Apr 11 01:45:34 lmtp(user(a)mydomain.com)<20801><pVlIEJ7wrlxBUQAAUdwEFQ>:*Debug: push-notification: Push notification transaction completed *By the way, the file****/private/vendor/vendor.dovecot/pvt/server/vendor/vendor.dovecot/http-notify* *does not exist on my server. Again, I appreciate the help :) ** > On 11 April 2019 07:57 Robust Coding via dovecot <dovecot(a)dovecot.org> wrote: > > > Hi Admin, > > I hope you consider reading and addressing my concern promptly. > > For the past few days I've been setting up a VPS with cPanel and WHM > pre-installed on Bluehost. I want to enable push notification plugin in > Dovecot2.3.5. I tried OX and Lua plugins and got errors. > > For using OX plugin: > push_notification_driver = ox:url=http://staging.mydomain.com/mail-notify/v1 > user_from_metadata > And got this error on runtime: > Error: push-notification-ox: Skipped because unable to get attribute: Mailbox > attributes not enabled > mail_attribute_dict = file:%h/Maildir/dovecot-attributes > When using Lua: > mail_plugins = $mail_plugins mail_lua notify push_notification > push_notification_lua > > plugin { > push_notification_driver = lua:file=/path/to/lua/push.lua > } > And got this order: > Plugin 'push_notification_lua' not found from directory /usr/lib64/dovecot > You do not have push_notification_lua installed. > I think I'm missing something here but I can't figure it out. Please HELP! > > Sincerely, > John Lopena > > -- > > "Become a programmer - Lose your brain's virginity" Aki

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masteruser can not select INBOX
by Ludwig Wieland 11 Apr '19

11 Apr '19

Hello, My Dovecot Master can login but not not select INBOX ! What's wrong ? best regards Luda 1) USER can select INBOX: OK --------------------------------------------------- telnet localhost imap Trying ::1... Connected to localhost. Escape character is '^]'. * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=CRAM-MD5 AUTH=DIGEST-MD5 AUTH=GSSAPI AUTH=PLAIN AUTH=LOGIN] Dovecot ready. a login test1 password a OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS BINARY MOVE SEARCH=FUZZY SPECIAL-USE COMPRESS=DEFLATE QUOTA ACL RIGHTS=texk] Logged in b select INBOX * FLAGS (\Answered \Flagged \Deleted \Seen \Draft) * OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags permitted. * 5 EXISTS * 0 RECENT * OK [UNSEEN 1] First unseen. * OK [UIDVALIDITY 1328091893] UIDs valid * OK [UIDNEXT 6] Predicted next UID * OK [HIGHESTMODSEQ 11] Highest b OK [READ-WRITE] Select completed (0.000 + 0.000 secs). c logout * BYE Logging out c OK Logout completed. Connection closed by foreign host. 2) MASTER-USER can't select INBOX: ! --------------------------------------------------- admins$ telnet localhost imap Trying ::1... Connected to localhost. Escape character is '^]'. * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=CRAM-MD5 AUTH=DIGEST-MD5 AUTH=GSSAPI AUTH=PLAIN AUTH=LOGIN] Dovecot ready. a login test1*mailmaster password a OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS BINARY MOVE SEARCH=FUZZY SPECIAL-USE COMPRESS=DEFLATE QUOTA ACL RIGHTS=texk] Logged in b select INBOX b NO [SERVERBUG] Internal error occurred. Refer to server log for more information. [2019-04-09 08:20:46] (0.000 + 0.000 secs). c logout * BYE Logging out c OK Logout completed. Connection closed by foreign host. ---------------------------------------- An the Server Error log says: Apr 09 00:05:40 imap(pid 62335 user test1): Error: Opening INBOX failed: Mailbox doesn't exist: INBOX ---------------------------------------- admins$ doveconf -n # 2.2.24 (a82c823): /Library/Server/Mail/Config/dovecot/dovecot.conf # OS: Darwin 16.7.0 x86_64 hfs auth_master_user_separator = * auth_mechanisms = cram-md5 digest-md5 gssapi plain login apop auth_realms = xserver.mydomain.ch auth_socket_path = /var/run/dovecot/auth-userdb auth_username_format = %n debug_log_path = /Library/Logs/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_urlauth_submit_user = submit info_log_path = /Library/Logs/Mail/mail-info.log log_path = /Library/Logs/Mail/mail-err.log login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c mail_access_groups = mail mail_attribute_dict = file:/Library/Server/Mail/Data/attributes/attributes.dict mail_location = maildir:/Library/Server/Mail/Data/mail/%u mail_log_prefix = "%s(pid %p user %u): " mail_plugins = quota zlib acl fts fts_sk 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 ihave mdbox_rotate_size = 200 M namespace acl-mailboxes { list = children location = maildir:/Library/Server/Mail/Data/mail/users/%%u:INDEX=/Library/Server/Mail/Data/mail/shared/%%u prefix = shared.%%u. separator = . subscriptions = no type = shared } namespace inbox { inbox = yes location = mailbox "Deleted Messages" { special_use = \Trash } 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 = } namespace list-archives { list = children location = maildir:/Library/Server/Mail/Data/listserver/messages/archive/lists/%%u:INDEX=/Library/Server/Mail/Data/listserver/messages/archive/shared/%%u prefix = archives.%%u. separator = . subscriptions = no type = shared } passdb { args = /Library/Server/Mail/Config/dovecot/master-users driver = passwd-file master = yes pass = yes } passdb { driver = od } passdb { args = /Library/Server/Mail/Config/dovecot/submit.passdb driver = passwd-file } plugin { acl = vfile:/Library/Server/Mail/Config/dovecot/global-acls:cache_secs=300 acl_shared_dict = file:/Library/Server/Mail/Data/shared/shared-mailboxes fts = sk quota = maildir:User quota quota_warning = storage=100%% quota-exceeded %u quota_warning2 = storage=80%% quota-warning %u sieve = /Library/Server/Mail/Data/rules/%u/dovecot.sieve sieve_dir = /Library/Server/Mail/Data/rules/%u stats_refresh = 30 secs stats_track_cmds = yes } postmaster_address = postmaster(a)xserver.myserver.ch protocols = imap pop3 lmtp sieve quota_full_tempfail = yes service auth { idle_kill = 15 mins unix_listener auth-userdb { user = _dovecot } } service dns_client { unix_listener dns-client { mode = 0600 } } service imap-login { inet_listener imap { port = 143 } inet_listener imaps { port = 993 ssl = yes } service_count = 0 } service imap { client_limit = 5 process_limit = 200 service_count = 0 } service indexer-worker { user = _dovecot } service lmtp { unix_listener lmtp { mode = 0600 } } service managesieve-login { inet_listener sieve { port = 4190 } } service pop3-login { inet_listener pop3 { port = 110 } inet_listener pop3s { port = 995 ssl = yes } } service pop3 { client_limit = 5 process_limit = 200 service_count = 0 } service quota-exceeded { executable = script /Applications/Server.app/Contents/ServerRoot/usr/libexec/dovecot/quota-exceeded.sh unix_listener quota-exceeded { group = mail mode = 0660 user = _dovecot } user = _dovecot } service quota-warning { executable = script /Applications/Server.app/Contents/ServerRoot/usr/libexec/dovecot/quota-warning.sh unix_listener quota-warning { group = mail mode = 0660 user = _dovecot } user = _dovecot } service stats { fifo_listener stats-mail { mode = 0600 user = _dovecot } } ssl = required ssl_ca = </etc/certificates/myserver.ch.A9FFFFB4B4C0E4CA959917BC2F60BDECBC414D35.chain.pem ssl_cert = </etc/certificates/myserver.ch.A9FFFFB4B4C0E4CA959917BC2F60BDECBC414D35.cert.pem ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL:!ADH:!eNULL ssl_key = </etc/certificates/myserver.ch.A9FFFFB4B4C0E4CA959917BC2F60BDECBC414D35.key.pem ssl_key_path = /etc/certificates/myserver.ch.A9FFFFB4B4C0E4CA959917BC2F60BDECBC414D35.key.pem ssl_protocols = !SSLv2 !SSLv3 userdb { args = partition=/Library/Server/Mail/Config/dovecot/partition_map.conf global_quota=0 enforce_quotas=yes driver = od } userdb { args = /Library/Server/Mail/Config/dovecot/submit.passdb driver = passwd-file } verbose_proctitle = yes protocol lmtp { mail_plugins = quota zlib acl fts fts_sk sieve } protocol lda { mail_plugins = quota zlib acl fts fts_sk sieve } protocol imap { mail_max_userip_connections = 20 mail_plugins = quota zlib acl fts fts_sk imap_acl imap_quota imap_zlib } protocol pop3 { mail_max_userip_connections = 6 }

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Lua Push Notification Plugin
by Robust Coding 11 Apr '19

11 Apr '19

Hi Admin, I hope you consider reading and addressing my concern promptly. For the past few days I've been setting up a VPS with cPanel and WHM pre-installed on Bluehost. I want to enable push notification plugin in Dovecot2.3.5. I tried OX and Lua plugins and got errors. For using OX plugin: push_notification_driver = ox:url=http://staging.mydomain.com/mail-notify/v1 user_from_metadata And got this error on runtime: *Error: push-notification-ox: Skipped because unable to get attribute: Mailbox attributes not enabled* When using Lua: mail_plugins = $mail_plugins mail_lua notify push_notification push_notification_luaplugin { push_notification_driver = lua:file=/path/to/lua/push.lua} And got this order: *Plugin 'push_notification_lua' not found from directory /usr/lib64/dovecot* I think I'm missing something here but I can't figure it out. Please HELP! Sincerely, John Lopena -- *"Become a programmer - Lose your brain's virginity"*

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ssl_cert: Can't open file permission denied
by Laura Smith 10 Apr '19

10 Apr '19

Dovecot 2.3.3 (dcead646b) openSUSE Leap 15.0 I am getting a weird error message: Fatal: Error in configuration file /etc/dovecot/local.conf line 16: ssl_cert: Can't open file /etc/foobar/ssl/certbot.pem: Permission denied I have tried the following: - chmod -R 655 /etc/foobar/ssl (/etc/foobar is 755) - create "ssl_users" group add dovecot to it chown -R dovecot:ssl_users /etc/foobar/ssl How can I fix this ? There's no obvious solution ?

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/var/run/dovecot/stats-writer) failed: Permission denied
by ＠lbutlr 10 Apr '19

10 Apr '19

I am getting this error in logs net_connect_unix(/var/run/dovecot/stats-writer) failed: Permission den)) and I looked around the google results and it seems to be related to using service stats, which I am not using. # doveconf -n | grep stat # doveconf -n | head -3 # 2.3.5.1 (7ec6d0ade): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.5 (2483b085) # OS: FreeBSD 11.2-RELEASE-p4 i386 Postfix is 3.4-20190106 (the newest version in ports) -- Over 3,500 gay marriages and, what, no hellfire? I was promise hellfire. And riots. What gives? -- Mark Morford

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Restoring mailboxes from backup duplicates messages in POP clients
by Luis F. V. Gomes 10 Apr '19

10 Apr '19

Hello I had a disk problem and had to reformat it. All mailboxes were backed up using rsync. After I restored the mailboxes, the POP clients (Thunderbird) that were configured to leave the messages on the mailserver for, let's say, 30 days, didn't understand that some messages were already transfered and the users got duplicated messages in their Inbox. How can we avoid this? -- Thanks Luís F. Gomes IT Manager (55)(21) 3527-1220 Departamento de Engenharia Elétrica PUC-Rio R. Marques de S. Vicente 225/401L 22451-900 - Rio de Janeiro/RJ

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