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Dovecot (doveadm, ssl, sync) - SSL error
by Arkadiusz Majewski 03 Dec '17

03 Dec '17

Hello! I've got a problem to run syncing between both dovecot services on the separate servers. The error indicates to the problem with SSL. Directly using openssl command to connect from one server to other and vice versa is passed without any errors. OS: FreeBSD 11.1-RELEASE-p4 Dovecot: 2.2.33.2_2 and the older one dovecot-2.2.32.1_1 (or similar) - build by ports. OpenSSL: 1.0.2k-freebsd 26 Jan 2017 dovecot: doveadm(10.18.1.15): Error: doveadm client disconnected before handshake: SSL_accept() failed: error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol dovecot.conf (on both servers): mail_plugins = $mail_plugins notify replication service replicator { process_min_avail = 1 } service aggregator { fifo_listener replication-notify-fifo { user = dovecot } unix_listener replication-notify { user = dovecot } } service replicator { unix_listener replicator-doveadm { mode = 0600 } } replication_max_conns = 10 service doveadm { inet_listener { port = 12130 ssl = yes } } ssl = required ssl_protocols = SSLv3 TLSv1 TLSv1.1 TLSv1.2 ssl_cert = </usr/local/etc/dovecot/ssl/cert.crt ssl_key = </usr/local/etc/dovecot/ssl/cert.key ssl_client_ca_file = </usr/local/etc/dovecot/ssl/ca.pem ssl_client_ca_dir = /usr/local/etc/dovecot/ssl Thank you in advance for any help. Kind Regards, Arkadiusz Majewski

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doveadm with 2-level user/domain quotas scheme
by Max Kostikov 03 Dec '17

03 Dec '17

Hi! I believe now it a right time to return to previous discussion about Dovecot's in 2-level user/domain quotas scheme wich was finished here https://dovecot.org/pipermail/dovecot/2015-October/102346.html Here is configuration. 1. Dictionary storage placed in MySQL table "quota2" root@localhost [(none)]> SHOW COLUMNS FROM quota2 FROM exim; +----------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------+--------------+------+-----+---------+-------+ | username | varchar(100) | NO | PRI | NULL | | | bytes | bigint(20) | NO | | 0 | | | messages | int(11) | NO | | 0 | | +----------+--------------+------+-----+---------+-------+ 3 rows in set (0,00 sec) 2. Two types of quota - for domains with index "2" and for users without index. ... plugin { quota = dict:user_quota::proxy::sqluserquota quota_rule2 = Trash:storage=+10%% quota_rule3 = Junk:storage=+10%% quota_warning = storage=100%% quota-exceeded 100 %u quota_warning2 = storage=95%% quota-warning 95 %u quota_warning3 = storage=90%% quota-warning 90 %u quota_warning4 = storage=75%% quota-warning 75 %u quota2 = dict:domain_quota:%d:proxy::sqldomainquota } dict { sqluserquota = mysql:/usr/local/etc/dovecot/dovecot-dict-sql-user.conf sqldomainquota = mysql:/usr/local/etc/dovecot/dovecot-dict-sql-domain.conf } service dict { unix_listener dict { user = mailnull mode = 0660 } } ... 3. Both stored in the same table and files "dovecot-dict-sql-user.conf" and "dovecot-dict-sql-domain.conf" are identical. connect = host=localhost dbname=exim user=user password=password map { pattern = priv/quota/storage table = quota2 username_field = username value_field = bytes } map { pattern = priv/quota/messages table = quota2 username_field = username value_field = messages } All quotas for users and domains are calculates correctly until "doveadm quota recalc" use. root@beta:~ # doveadm quota recalc -u foo(a)my.domain root@beta:~ # doveadm quota get -u foo(a)my.domain Quota name Type Value Limit % user_quota STORAGE 7850978 - 0 user_quota MESSAGE 32474 - 0 domain_quota STORAGE 7850978 - 0 domain_quota MESSAGE 32474 - , 0 If we look at MySQL table directly foo(a)my.domain quota was counted right but last users data was copied into domains values. ... root@localhost [exim]> SELECT * FROM quota2 WHERE username LIKE '%my.domain'; +-------------------+-------------+----------+ | username | bytes | messages | +-------------------+-------------+----------+ | foo(a)my.domain | 8039401321 | 32474 | | my.domain | 8039401321 | 32474 | | john(a)my.domain | 3455382803 | 11142 | | mary(a)my.domain | 544637146 | 1965 | +-------------------+-------------+----------+ 4 rows in set (0.00 sec) ... Also you may see that "doveadm quota get" above gave wrong values. For domain its produces empty output root@beta:~ # doveadm quota get -u my.domain doveadm(my.domain): Error: User doesn't exist Quota name Type Value Limit % Than if we are trying to calculate quota for domain or for all users (-A) it produces an error. root@beta:~ # doveadm quota recalc -u my.domain doveadm(my.domain): Error: User doesn't exist root@beta:~ # doveadm quota recalc -A Error: User listing returned failure doveadm: Error: Failed to iterate through some users So "doveadm quota" almost useless for such quotas scheme except single user. I wrote small shell-script "dovequota.sh" to resolve this issue but I believe that doveadm need to be fixed too. (script may be found here https://kostikov.co/problemy-uchyota-domennoj-kvoty-v-dovecot-2) -- With best regards, Max Kostikov BBM: 24CA5DF8 | W: https://kostikov.co

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Re: Howto authenticate smartPhone via Active Directory
by Aki Tuomi 03 Dec '17

03 Dec '17

Actually you are authenticating gssapi clients from ad and everyone else from shadow. maybe you need to configure pam module? ---Aki TuomiDovecot oy -------- Original message --------From: Mark Foley <mfoley(a)ohprs.org> Date: 03/12/2017 06:03 (GMT+02:00) To: dovecot(a)dovecot.org Subject: Howto authenticate smartPhone via Active Directory I have a Samba4 Active Directory server. Dovecot authenticates AD Users with domain credentials using GSSAPI (Thunderbird client). I believe I have Dovecot set to attempt authentication via shadow first and. failing that, it does authenticate via GSSAPI. Smartphones connect to Dovecot via port 143 and SSL. They are not domain members so if the shadow authentication fails, no other methods are tried and no connection is made. What can I do with my dovecot config to fix this? > doveconf -n # 2.2.15: /usr/local/etc/dovecot/dovecot.conf # OS: Linux 4.4.88 x86_64 Slackware 14.2 auth_debug = yes auth_debug_passwords = yes auth_gssapi_hostname = $ALL auth_krb5_keytab = /etc/dovecot/dovecot.keytab auth_mechanisms = plain login gssapi auth_use_winbind = yes auth_username_format = %n auth_verbose = yes auth_verbose_passwords = plain disable_plaintext_auth = no info_log_path = /var/log/dovecot_info mail_location = maildir:~/Maildir passdb { driver = shadow } protocols = imap ssl_cert = </etc/ssl/certs/OHPRS/GoDaddy/Apache/2016-08-10/54e789087d419b6e.crt ssl_key = </etc/ssl/certs/OHPRS/GoDaddy/mail.ohprs.org.key userdb { driver = passwd } verbose_ssl = yes Thanks, Mark

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mmap() Error, Invalid Argument - Double slash in path?
by GE Junk 02 Dec '17

02 Dec '17

I get a ton of these mmap() errors in the log. I noticed there's a double slash before Maildir. Is this normal? Config error? Dovecot bug? dovecot: imap(email(a)email.net): Error: mmap() failed with file /shares/email/vmail/vmail1/email.net/e/m/a/email-2017.02.25.08.09.39//Maildir/dovecot.index.cache: Invalid argument I'm running dovecot version 2.2.22 Thanks Eric

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Re: Lua Auth
by Aki Tuomi 02 Dec '17

02 Dec '17

-------- Original message --------From: Mark Moseley <moseleymark(a)gmail.com> Date: 02/12/2017 02:34 (GMT+02:00) To: Cc: Dovecot Mailing List <dovecot(a)dovecot.org> Subject: Re: Lua Auth On Thu, Nov 30, 2017 at 5:26 AM, Stephan Bosch <s.bosch(a)ox.io> wrote: > > > Op 29-11-2017 om 6:17 schreef Aki Tuomi: > >> On November 29, 2017 at 4:37 AM Mark Moseley <moseleymark(a)gmail.com> >>> wrote: >>> >>> >>> Just happened to be surfing the docs and saw this. This is beyond >>> awesome: >>> >>> https://wiki2.dovecot.org/AuthDatabase/Lua >>> >>> Any words of wisdom on using it? I'd be putting a bunch of mysql logic in >>> it. Any horrible gotchas there? When it says 'blocking', should I assume >>> that means that a auth worker process will *not* accept any new auth >>> lookups until both auth_passdb_lookup() and auth_userdb_lookup() have >>> completed (in which I'd be doing several mysql calls)? If that's the >>> case, >>> I assume that the number of auth workers should be bumped up. >>> >>> And is a 2.3 release fairly imminent? >>> >> Hi! >> >> This feature was added very recently, and there is very little >> operational experience on it. As the docs should say, blocking=yes means >> that an auth worker is used, and yes, it will block each auth worker during >> authentication, but what we tried, it should perform rather nicely. >> >> The most important gotcha is to always test your lua code rigorously, >> because there is not much we can do to save you. >> >> It should be present in master branch, so if someone feels like trying it >> out, please let us know if you find any bugs or strangeness. It's not >> present in nightlies yet. >> >> We are planning on releasing 2.3.0 this year. >> > > The Xi package builder has this feature enabled since yesterday. It is > available in the dovecot-lua package; the first Xi package that doesn't > have an official Debian equivalent (yet anyway). > > > I've been playing with Lua auth and so far no issues. I was previously putting together a very ugly MySQL stored procedure. Using Lua would be a lot easier (esp when it comes to returning an arbitrary number of columns). I'd love to see any test Lua code that the dovecot team has been playing around with (and realize it's not remotely production-ready, so don't worry about caveats I did have a couple of questions though: 1) Is the data returned by Lua auth not cacheable? I've got the following settings (and I'm just using Lua in the userdb lookup, not passdb -- passdb is doing a lightweight SQL lookup for username/password): auth_cache_negative_ttl = 1 mins auth_cache_size = 10 M auth_cache_ttl = 10 mins but I notice that every time I auth, it'll redo all the queries in my Lua code. I'd have expected that data to be served out of cache till the 10min TTL is up 2) Is there an appropriate way to return data with spaces in it (or presumably other non-alphanum chars. My quota name had a space in it, which somehow got interpreted as 'yes' , i.e.: imap: Error: Failed to initialize quota: Invalid quota root quota: Unknown quota backend: yes I simply changed the space to an underscore as a workaround, but I'm curious if there's a better way. I tried various quoting without success. Didn't try escaping yet. 3) Can you elaborate on the "auth_request#response_from_template(template)" and "auth_request#var_expand(template)" functions? Specifically how to use them. I'm guessing that I could've used one of them to work around #2 (that it would have done the escaping for me) Thanks! ----- 1) I'll have to check this. 2) Instead of string, return a key value table. you can have spaces in values. 3) response_from_template expands a key=value string into table by var expanding values. var_expand can be used to interpolation for any purposes. it returns a string. see https://wiki.dovecot.org/Variables for details on how to use it. Individual variable access is more efficient to do directly. --- Aki Tuomi

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Re: iPhone/iPad IMAP connection bursts causes user+IP exceeded
by Joseph Tam 02 Dec '17

02 Dec '17

"David.M.Clark" <david(a)davrom.com> wrote: > I have modified mail_max_userip_connections to 400 which made no difference. > > The end user customer actually had Apple remote into their device and > they were impressed that the end user knew their IMAP settings. They > tested it and during this connection time, it worked as expected with > send and receive of e-mails. After Apple support disconnected from the > device, it not longer worked. I'm not sure your problem is the same as mine. Apart from getting a lot of these log messages ... Oct 24 21:32:54 server dovecot: imap-login: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=12): user=<user> my users are not reporting any functional problems. I investigated this a little further. I bumped mail_max_userip_connections to 100, and looked at one of these connection bursts for one of my users. What I found was that it would steadily open new connections, hit the cap, then disconnect them all, and start the cycle over again. However, it would stop when the total number of connections made roughly equal to the number of mailboxes the user had. So a rough algorithm for these clients is for each mailbox[1..n] { if open mailbox[i] { ... do operation ... } else { // Hit cap close all open mailboxes } } close all open mailbox For example, if the user has 13 mailboxes and mail_max_userip_connections=5, you would see (c=connect, d=disconnect, m=max log lessage): ccccc m ddddd ccccc m ddddd ccc ddd I'm not sure whether the reader client displays partial results, or it collects all the results when the entire operation finishes. So the final effect I saw of bumping mail_max_userip_connections from the server perspective is that I get fewer "Maximum number of connections" log messages. Joseph Tam <jtam.home(a)gmail.com>

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client unable to send mail, dovecot-imap errors
by GE Junk 02 Dec '17

02 Dec '17

Hi, I have an email client that is currently unable to send mail through imap. I am getting a ton of errors in dovecot-imap.log. All of these errors continue to show up, even after purging the dovecot*.* files from the offending folders. This happens to all email accounts on the server. Clearing the cache files doesn't fix, the error appears pretty much immediately after the new cache is generated. ============================== Error: mmap() failed with file path/Maildir/dovecot.index.cache: Invalid argument ============================== These errors are associated with an account unable to send right now. They seem to have only started since the send problem started. ============================== Error: Corrupted transaction log file path/Maildir/dovecot.index.log seq 5: indexid changed 1512100549 -> 1512183737 (sync_offset=0) Error: Index path/Maildir/dovecot.index: Lost log for seq=5 offset=12576: Failed to map file seq=178 offset=40..18446744073709551615 (ret=0) Warning: fscking index file path/Maildir/dovecot.index Error: Fixed index file path/Maildir/dovecot.index: log_file_seq 5 -> 179 IMAP session state is inconsistent, please relogin. in=26 out=1276 ============================== This error is also associated with the offending email client ============================== message repeated 9 times: [ imap(emailaddress): Error: Transaction log path/Maildir/dovecot.index.log: duplicate transaction log sequence (2)] ============================== Some additional info: dovecot: 2.2.22 (fe789d2) Ubuntu Server 16.04 Running on a qemu VM installed on an Unraid 6.3.5 Server 4GB RAM mail folder is located on virtio 9p2000 host passthru fs located on the same physical machine as the VM. Anyone have any ideas? Need additional information? Thanks, Eric

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Lua Auth
by Mark Moseley 02 Dec '17

02 Dec '17

Just happened to be surfing the docs and saw this. This is beyond awesome: https://wiki2.dovecot.org/AuthDatabase/Lua Any words of wisdom on using it? I'd be putting a bunch of mysql logic in it. Any horrible gotchas there? When it says 'blocking', should I assume that means that a auth worker process will *not* accept any new auth lookups until both auth_passdb_lookup() and auth_userdb_lookup() have completed (in which I'd be doing several mysql calls)? If that's the case, I assume that the number of auth workers should be bumped up. And is a 2.3 release fairly imminent?

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Autoreplies are not sent
by Sergio Belkin 01 Dec '17

01 Dec '17

Hi, Let's say I have 2 domains: - Virtual Mailbox Domain: example.local (internal domain) - Virtual Alias Domain: example.com (public domain) Every mail sent to @example.com is really sent to @example.local. I have a virtual alias that forward mails sent to support-abc(a)example.com is sent finally to: op1(a)example.local Now, I'd want to every mail was sent to support-abc(a)example.com it triggers an autoreply vacation style. So, I've wrote and compiled a sieve filter, something like that and put in op1(a)example.local sieve folder. But it fails complaining like that: nov 29 15:55:39 muteriver.example.local dovecot[12549]: lmtp(12675, op1(a)example.local) CqNdF6sCH1qDMQAAcSFsIQ: sieve: msgid=< ded22f3d-f1e3-157e-0667-ca73d851d1a8(a)example.com>: discarding vacation response for implicitly delivered message; no known (envelope) recipient address found in message headers (recipient=<op1(a)example.local>, and additional `:addresses' are specified) I've tried appending in dovecot configuration: lda_original_recipient_header = X-Original-To But it does not work either. Using: dovecot-pigeonhole-2.2.10-8.el7.centos.x86_64 and postfix-2.10.1-6.el7.x86_64 Please could you help me? Thanks in advance! -- -- Sergio Belkin LPIC-2 Certified - http://www.lpi.org

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Re: iPhone/iPad IMAP connection bursts causes user+IP exceeded
by David.M.Clark 01 Dec '17

01 Dec '17

Thanks for the reply and suggestion Robert. I have now set mail_max_userip_connections to 400 in 20-imap.conf to see if it makes any difference. Late yesterday the customer tested from his office, an older IOS 9 tablet and he had IMAP working in a matter of minutes, so is certainly an newer software version by Apple issue. On 30/11/17 03:03, Robert Giles wrote: > David, > > I'd say that if you set the mail_max_userip_connections value to a > large-ish number (300-400), your users likely won't notice an issue on > their iOS 10.x and iOS 11.x devices. It's more of an annoyance in the > logs, and occasionally the iOS Mail app will show that it is stuck > checking mail for a few minutes (when the new max_userip_connections is > reached again, but with a large number, it happens much less frequently). > > Keep in mind max_userip applies to *authenticated* users, so a true, > malicious DoS situation is less likely. > > And yeah, I'm definitely tired of Apple going off and breaking their > software, because the blame always comes back on IT instead of Apple :( > > Robert > > > > On 2017-11-28 at 22:18, David.M.Clark wrote: >> Robert just got this one today. >> >> A customer has phoned who has replaced or updated their Apple 'stuff' >> (including iPhone 8 just purchased) and the identical settings that >> work on the older Apple based devices, as well as Outlook based PCs, >> work fine with IMAP (internal port 143 and external port 10143), but >> the newer IOS based devices just do not work. iPhone 8 does not let >> you downgrade to earlier OS either, which is something the customer >> was thinking of doing. >> >> Once again either Apple or Microsoft have 'moved the goal posts' >> expecting everyone else in the world to be forced to move with them. >> >> They are reporting issues on-line also with MS server and Office 365 >> so will be hoping we have some kind of good result quickly from Apple >> as this will only get worse as more people update and find their >> e-mail is 'dead in the water'. >> >> On 04/11/17 06:19, Robert Giles wrote: >>> Apologies for bumping Joseph Tam's rather old thread, but I'm >>> wondering if anyone has come up with a workaround/fix for this >>> problem that iOS Mail.app clients (10.3.3, 11.0.3, 11.1?) continue to >>> exhibit? >>> >>> Robert >>> >>> >>> >>> On 10/28/2016 at 03:49 PM, Joseph Tam wrote: >>>> I frequently see this from my iPhone/iPad IMAP users: >>>> >>>> Oct 24 21:30:55 server dovecot: imap-login: Login: user=<user>, >>>> ... >>>> [... repeated 10 times ...] >>>> Oct 24 21:32:54 server dovecot: imap-login: Maximum number of >>>> connections from user+IP exceeded (mail_max_userip_connections=12): >>>> user=<user> >>>> Oct 24 21:32:54 server dovecot: imap(user): Logged out ... >>>> [... repeated 11 times ...] >>>> >>>> These bursts of logins/max/logouts would cycling on for a few minutes. >>>> Googling this problem seems to turn up lots of similar complaints about >>>> iOS mail mail clients. e.g. >>>> >>>> https://discussions.apple.com/thread/2547839?tstart=0 >>>> >>>> iOS mail readers do not limit connections limit as other mailreaders >>>> can. I could increase mail_max_userip_connections, but that just moves >>>> the goal posts. >>>> >>>> Using the new rawlog feature in 2.2.26 (thanks Dovecot team!), I was >>>> able >>>> to see that these connection bursts are caused by clients doing global >>>> searches. The rawlogs show each mailbox being SELECT'd and searched >>>> (e.g. From header string): >>>> >>>> 1477369968.730450 2 ID ("name" "iPad Mail" "version" "13G36" >>>> "os" "iOS" "os-version" "9.3.5 (13G36)") >>>> 1477369968.781932 3 SELECT {mailbox} >>>> 1477369968.961636 4 UID SEARCH RETURN (COUNT) 1:* NOT DELETED >>>> 1477369969.006087 5 UID SEARCH RETURN (ALL) 1:* NOT DELETED >>>> 1477369969.052701 6 UID SEARCH RETURN (ALL) {search-term} NOT >>>> DELETED >>>> 1477369974.624153 7 LOGOUT >>>> >>>> Questions: >>>> >>>> 1) How does this affect the user? I heard from one user that it >>>> makes global searches unusable because his reader just spins its >>>> wheel. I'm not sure whether this is impatience or this results >>>> in failed searches. >>>> >>>> 2) Is there a client-side fix (e.g. connection limiting)? >>>> Apple appears to be intransigent on addressing this. >>>> >>>> 3) Will maintaining search indices (e.g. solr) help with this? >>>> Maybe the searches are taking too long and the connections pile >>>> up waiting for previous searches to finish. >>>> >>>> Thanks, >>>> Joseph Tam <jtam.home(a)gmail.com> >>> >> > -- As always, I remain at your service. Kindest Regards, David.M.Clark (Director - Senior Linux/UNIX Consultant) =--------------------------------------------------------------------------= Davrom Consulting Pty Ltd Mobile: 0418763124 PO Box 1644, Sunnybank Hills, 4109 E-mail (Work): david(a)davrom.com ABN: 81 096 990 804 E-mail (Priv): dmc1961(a)dmc1961.id.au Website: http://davrom.com Skype: dmc1961 Podcast: http://ldup.com.au Google: dmc1961(a)gmail.com =--------------------------------------------------------------------------= Specialising in: Linux (Fedora/RedHat/CentOS), UNIX, SCO, MikroTik, Networking/Internet, E-mail/Web Technologies =--------------------------------------------------------------------------= Please note: Any e-mail communication bearing this signature is for the exclusive purpose of the sender and is not for publication without the expressed permission of the sender or respective sender's organisation. =--------------------------------------------------------------------------=

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