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Re: Proxy secured incoming POP3/IMAP4 to unsecure backend?
by Alexander Chekalin 17 Sep '18

17 Sep '18

Thank you! Ok, so I can omit ssl=no and startssl=no, and this results in default settings for ssl which is 'off'? Or the defaults are 'on' anyway? Can I somehow specify ports on remote hosts that proxy will use to connect to? Like (just image): 'proxy host_imap=10.1.1.1:143 host_pop=10.1.1.1:110' or somehow? On Mon, Sep 17, 2018 at 4:33 PM Aki Tuomi <aki.tuomi(a)dovecot.fi> wrote: > Due to certain design issues, the ssl=no is actually same as ssl=yes, same > goes for starttls=no. So there is no support actually for "ssl=no" at this > moment. > > Aki > > > On 17 September 2018 at 15:32 Alexander Chekalin < > alexander.chekalin(a)gmail.com> wrote: > > > > > > Surely. > > > > Here it is: > > > > # doveadm auth user(a)domain.com > > Password: > > passdb: chekalin_krg(a)ascon.ru auth succeeded > > extra fields: > > user=user(a)domain.com > > proxy > > host=10.10.14.131 > > ssl=no > > startssl=no > > source_ip=10.10.14.2 > > proxy > > proxy > > pass=password > > > > Two "proxy" are from two "proxy" and "proxy=yes" settings passed from > > passdb. > > > > On Mon, Sep 17, 2018 at 3:03 PM Aki Tuomi <aki.tuomi(a)dovecot.fi> wrote: > > > > > Can you provide output of > > > > > > doveadm auth test some-user > > > Aki > > > > > > On 17.09.2018 14:58, Alexander Chekalin wrote: > > > > > > Dear Aki, > > > > > > we keep our users in LDAP so I when I even return 'proxy > host=backend_ip > > > tls=no' it won't use non-TLS connection. The same is when I remove > 'tls=no' > > > part. May there be any extra things I need to pass when I use LDAP? > > > > > > On Mon, Sep 17, 2018 at 2:07 PM Aki Tuomi <aki.tuomi(a)dovecot.fi> > wrote: > > > > > >> > > >> > > >> On 17.09.2018 13:59, Alexander Chekalin wrote: > > >> > Hi, > > >> > > > >> > I try to set up dovecot as a proxy server, to proxy requests to > > >> > several dovecot-based backend servers. I wand external clients who > > >> > connects to this proxy Dovecot to use TLS (this is easy to set up) > > >> > while want to have unsecured (plain IMAP/POP) connections to > backends. > > >> > > > >> > You see, links to backends are over LAN so no TLS needed, and these > > >> > backends are poor old machines (with old Docecots like 2.0.6) this > is > > >> > why I don't want to use TLS to acces backends. > > >> > > > >> > But as I did the test setup I can see proxy Dovecot uses TLS to > > >> > connect to backends. Is there any way I can specify this aspect of > > >> > Dovecot proxy? > > >> > > > >> > Please advice! > > >> > > > >> > Yours, > > >> > Alexander > > >> > > >> Dovecot does not use TLS/SSL when connecting to a backend server by > > >> default, you are probably specifying this in your proxy config or > > >> password database. > > >> > > >> Aki > > >> > > > > > > >

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Proxy secured incoming POP3/IMAP4 to unsecure backend?
by Alexander Chekalin 17 Sep '18

17 Sep '18

Hi, I try to set up dovecot as a proxy server, to proxy requests to several dovecot-based backend servers. I wand external clients who connects to this proxy Dovecot to use TLS (this is easy to set up) while want to have unsecured (plain IMAP/POP) connections to backends. You see, links to backends are over LAN so no TLS needed, and these backends are poor old machines (with old Docecots like 2.0.6) this is why I don't want to use TLS to acces backends. But as I did the test setup I can see proxy Dovecot uses TLS to connect to backends. Is there any way I can specify this aspect of Dovecot proxy? Please advice! Yours, Alexander

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Problem with envelope from in Pigeonhole after upgrade
by David Dodd 17 Sep '18

17 Sep '18

On our FreeBSD 11.2 servers, we recently upgraded from: dovecot2-2.2.26.0_1 dovecot-pigeonhole-0.4.16_1 to: dovecot-2.3.2.1 dovecot-pigeonhole-0.5.2_3 Prior to the upgrade the envelope sender was as expected. After the upgrade, the envelope sender for a user with a sieve script configured is now being set to: >From MAILER-DAEMON Tue Sep 04 13:31:39 2018 The same user without a sieve script in place gets: >From someone(a)gmail.com Tue Sep 04 11:06:04 2018 This happens when manually testing by directly executing: /usr/local/libexec/dovecot/dovecot-lda -d dgdtst -f someone(a)gmail.com It happens with an empty sieve script i.e. just using the implicit keep functionality. I have groped around looking for a configuration setting that might fix the behaviour but nothing I have tried helps. Can anyone suggest what to set to correct the problem ? -- Dave

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Quotas not working with roundcube
by Mik J 17 Sep '18

17 Sep '18

Hello, I'm trying to have quotas working with roundcube. When I'm logged into roundcube I see 0% quota which seems to correspond to disabled. However I did everything that I could to enable quotas https://wiki.dovecot.org/Quota # doveconf -n auth_mechanisms = cram-md5 loginauth_verbose = yes debug_log_path = /tmp/dovecot.log first_valid_uid = 1000 log_path = /var/log/dovecot.log mail_gid = vmail mail_location = maildir:/home/mail/%d/%n/Maildir mail_plugins = notify replication quota mail_uid = vmail mbox_write_locks = fcntl mmap_disable = yes 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 = } passdb { driver = bsdauth } passdb { args = /etc/dovecot/dovecot.passwd driver = passwd-file } plugin { quota_grace = 10%% quota_rule = *:storage=2G quota_rule2 = Trash:storage=+200M quota_rule3 = SPAM:ignore quota_status_nouser = DUNNO quota_status_overquota = 552 5.2.2 Mailbox is full quota_status_success = DUNNO quota_warning = storage=95%% quota-warning 95 %u quota_warning2 = storage=80%% quota-warning 80 %u } ssl_ca = /etc/ssl/certs/CA_Intermed_Lets_Encrypt.crt ssl_cert = </etc/ssl/certs/imap.mydomain.org.crt ssl_key = # hidden, use -P to show it ssl_key_password = # hidden, use -P to show it userdb { driver = passwd } userdb { driver = static } protocol lda { mail_plugins = notify replication quota } protocol imap { mail_plugins = notify replication quota imap_quota }

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Dsync deleting mailboxes due to duplicate UIDs
by Andreas Thienemann 16 Sep '18

16 Sep '18

Hi, I am attempting to migrate a mailspool from a cyrus server to a dovecot server using the dsync backup approach as described in the wiki at <https://wiki.dovecot.org/Migration/Dsync>. The first attempt works great. Everything copies over and a quick glance over the spool looks good. Running doveadm backup again though results in the following error: dsync(eggs): Warning: Deleting mailbox 'INBOX.MailRestore': UID=39 already exists locally for a different mail: Headers hashes don't match (18d567fc7e258a67e47b629c8bb16500 vs 230354b2d5cad21ebbb4a7440b977adb) As promised, the folder MailRestore is gone after dsync finishes. Running doveadm backup again for the third time copies the folder again. Running it a fourth time gives the same error and the folder is gone. Trying to figure this out I initially had a few mails where the header hashes were 68b329da9893e34099c7d8ad5cb9c940, the md5sum of an empty string. Turns out that the source mailspool had a few broken emails and cleaning these out fixed most my issues. But in this case, I am stumped. UID 39 on the server is a valid mail with correct headers and everything. Is there a good way of identifying the two mails that seem to clash? I had a quick look at the dovecot code but did not see how the header_stream gets hashed into the hdr_hash used for comparing mails. Thanks, Andreas

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dovecot_deleted_to_trash no longer compiles with dovecot 2.3.2.1
by Robert S 16 Sep '18

16 Sep '18

I have just upgraded to the latest version of dovecot (Gentoo amd64). When I try to compile the dovecot_deleted_to_trash plugin it won't compile. Is this plugin going to be updated (from https://github.com/lexbrugman/dovecot_deleted_to_trash - same error from https://github.com/NethServer/dovecot-deleted-to-trash)? # make cc \ -fPIC -shared -Wall \ -I/usr/include/dovecot \ -I/usr/include/dovecot/src \ -I/usr/include/dovecot/src/lib \ -I/usr/include/dovecot/src/lib-storage \ -I/usr/include/dovecot/src/lib-mail \ -I/usr/include/dovecot/src/lib-imap \ -I/usr/include/dovecot/src/lib-index \ -DHAVE_CONFIG_H \ src/deleted-to-trash-plugin.c -o lib_deleted_to_trash_plugin.so src/deleted-to-trash-plugin.c: In function ‘copy_deleted_mail_to_trash’: src/deleted-to-trash-plugin.c:117:16: error: too few arguments to function ‘mail box_transaction_begin’ dest_trans = mailbox_transaction_begin(trash_box, MAILBOX_TRANSACTION_FLAG_EX TERNAL); ^~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /usr/include/dovecot/mail-storage-private.h:7:0, from src/deleted-to-trash-plugin.h:5, from src/deleted-to-trash-plugin.c:4: /usr/include/dovecot/mail-storage.h:656:1: note: declared here mailbox_transaction_begin(struct mailbox *box, ^~~~~~~~~~~~~~~~~~~~~~~~~ make: *** [Makefile:32: lib_deleted_to_trash_plugin.so] Error 1 Some further info: # dovecot -n # 2.3.2.1 (0719df592): /etc/dovecot/dovecot.conf # OS: Linux 4.14.8-gentoo-r1 x86_64 Gentoo Base System release 2.4.1 # Hostname: basement-vm.schmidli.com.au doveconf: Warning: please set ssl_dh=</etc/dovecot/dh.pem doveconf: Warning: You can generate it with: dd if=/var/lib/dovecot/ssl-parameters.dat bs=1 skip=88 | openssl dhparam -inform der > /etc/dovecot/dh.pem dict { expire = db:/var/lib/dovecot/expire.db } disable_plaintext_auth = no listen = * mail_location = maildir:~/.maildir mail_plugins = deleted_to_trash mailbox_alias 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 = } passdb { args = * driver = pam } plugin { deleted_to_trash_folder = Trash expire = Trash 7 Spam 30 expire_dict = proxy::expire

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Re: auth_policy in a non-authenticating proxy chain
by Peter Mogensen 15 Sep '18

15 Sep '18

On 09/15/2018 10:41 AM, Aki Tuomi wrote: > Point of sending the success ones is to maintain whitelist as well as > blacklist so you know which ones you should not tarpit anymore. We > know it does scale as we have very large deployments using the whole > three request per login model. > > "Success" in a proxy which is not it self authenticating is only whether it know where to proxy the requested username to. I'm not sure whether this would be input to a whitelist. I'm not doubting that 3 req/login scales. /Peter

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auth_policy in a non-authenticating proxy chain
by Peter Mogensen 15 Sep '18

15 Sep '18

Hi, I was looking into the new Authentication Policy feature: https://wiki2.dovecot.org/Authentication/Policy I had kinda hoped that I would be able to enfore this in a proxy running in front of several backends. This proxy does not authenticate. It use "nopassword". But I realize that the "succes" reported in the final authpolicy req. (command=report) is not what is actaully happening on the IMAP protocol level, but rather the result of the passdb chain in the proxy. (I should probably have predicted this, it's kinda reasonable). However... since the proxy use "nopassword", ALL passdb lookups result in "success", so the proxy will never report an authentication failure to the authpolicy server. This, of course, forces me to do the authpolicy check on the backend with a shared state, but It would still have been nice to have the proxy being able to do the first "command=allow" req. and reject attemps already there even though the backend does "command=report". /Peter

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encryption issue in outlook 2016
by ChandranManikandan 14 Sep '18

14 Sep '18

Hi Friends, Am facing the serious issue in outlook 2016. When i tried to configure the email in outlook 2016 it's asking encrypted connection and checked automatically and if not available then it showing unencrypted. but finally unable to configure the email account in outlook 2016 and not permitted. Do i need to update any in the server. Am using COS 6 32 and 64 bit servers with qmailtoaster + dovecot 2.2.7. Currently configured in outlook 2010 it's working without any issue. And always showing in outlook 2010 when i open the account. Do you want to continue yes or no for the certification. Because i have configured in advanced selected Auto in outlook 2010. If i select none it was not working the email. Anyone facing the same issue. How do i rectify it in outlook 2016 and how can i stop the certificate warning message in outlook. If possible to use without encryption and what's the configuration. Please advice and let me know the process. Am seriously cannot access the email from outlook. I have attached the message while open outlook. If i click yes then it will open Is the certificate expired. How do renew it or reload it with the fresh certificate. -- *Thanks & Best Regards,Manikandan.C*

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Occasional crash in db-auth.c (Valgrind: Invalid read of size 4 et al.), Dovecot 2.2.27+
by Jonas Wielicki 14 Sep '18

14 Sep '18

Dear list, We are encountering troubles with dovecot using LDAP userdbs on Debian stretch (but if I’m reading valgrind correctly, we can reproduce this with vanilla dovecot master). Minimal reproducer below. While testing an upgrade to Debian stretch (dovecot-core=1:2.2.27-3+deb9u1), auth-worker has stopped working. We are using two LDAP user databases; one which is iterable, and one which is not (for reasons; I think this is not relevant; if it is, we’re happy to elaborate). The issue seems to be present in any LDAP userdb iteration handling, but it only seems to cause a crash in certain conditions which seem to be reproducibly caused by our setup for some reason. We’re seeing one of two errors. Variant A: Jan 27 13:40:05 up2 dovecot: auth-worker: Error: *** Error in `dovecot/auth': free(): corrupted unsorted chunks: 0x000056553f0fcfa0 *** Jan 27 13:40:05 up2 dovecot: auth-worker: Error: ======= Backtrace: ========= Jan 27 13:40:05 up2 dovecot: auth-worker: Error: /lib/x86_64-linux-gnu/ libc.so.6(+0x70bcb)[0x7f78426adbcb] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: /lib/x86_64-linux-gnu/ libc.so.6(+0x76f96)[0x7f78426b3f96] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: /lib/x86_64-linux-gnu/ libc.so.6(+0x777de)[0x7f78426b47de] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: /usr/lib/dovecot/modules/ auth/libauthdb_ldap.so(+0x5bde)[0x7f7842008bde] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: /usr/lib/dovecot/ libdovecot.so.0(io_loop_call_io+0x52)[0x7f78430cfdd2] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: /usr/lib/dovecot/ libdovecot.so.0(io_loop_handler_run_internal+0x109)[0x7f78430d1409] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: /usr/lib/dovecot/ libdovecot.so.0(io_loop_handler_run+0x3c)[0x7f78430cfe6c] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: /usr/lib/dovecot/ libdovecot.so.0(io_loop_run+0x38)[0x7f78430d0018] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: /usr/lib/dovecot/ libdovecot.so.0(master_service_run+0x13)[0x7f7843057e93] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: dovecot/auth(main+0x398) [0x56553da45f98] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: /lib/x86_64-linux-gnu/ libc.so.6(__libc_start_main+0xf1)[0x7f784265d2b1] Jan 27 13:40:05 up2 dovecot: auth-worker: Error: dovecot/auth(_start+0x2a) [0x56553da461aa] Variant B: Jan 27 13:06:56 up2 dovecot: auth-worker(27495): Panic: file db-ldap.c: line 840 (db_ldap_result_unref): assertion failed: (res->refcount > 0) Jan 27 13:06:56 up2 dovecot: auth-worker(27495): Error: Raw backtrace: /usr/ lib/dovecot/libdovecot.so.0(+0x95272) [0x7f027a4fc272] -> /usr/lib/dovecot/ libdovecot.so.0(+0x9536d) [0x7f027a4fc36d] -> /usr/lib/dovecot/libdovecot.so. 0(i_fatal+0) [0x7f027a492951] -> /usr/lib/dovecot/modules/auth/ libauthdb_ldap.so(+0x3868) [0x7f0279447868] -> /usr/lib/dovecot/modules/auth/ libauthdb_ldap.so(+0x5d7c) [0x7f0279449d7c] -> /usr/lib/dovecot/libdovecot.so. 0(io_loop_call_io+0x52) [0x7f027a510dd2] -> /usr/lib/dovecot/libdovecot.so. 0(io_loop_handler_run_internal+0x109) [0x7f027a512409] -> /usr/lib/dovecot/ libdovecot.so.0(io_loop_handler_run+0x3c) [0x7f027a510e6c] -> /usr/lib/ dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f027a511018] -> /usr/lib/ dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f027a498e93] -> dovecot/ auth(main+0x398) [0x55b981cd2f98] -> /lib/x86_64-linux-gnu/libc.so. 6(__libc_start_main+0xf1) [0x7f0279a9e2b1] -> dovecot/auth(_start+0x2a) [0x55b981cd31aa] When running auth-worker within valgrind, we get more information (valgrind extract from mail.log attached for two versions of dovecot). We have attached mail.log contents for the respective valgrind runs. This seems to affect at least 2.2.27 onwards. We can reproduce the crash with our production data 100% of the time. The valgrind error is present even with very minimal setups (see below). Unfortunately, I haven’t been able so far to create an LDAP database which produces the crash as reliable as our production database does (which we cannot share for obvious reasons). Minimal Reproducer of Valgrind error: - Install dovecot 2.2.27 from debian stretch, or compile from master. - Install valgrind - In conf.d/10-auth.conf, disable auth-system.conf.ext - In conf.d/10-auth.conf, enable auth-ldap.conf.ext - Set contents of dovecot-ldap.conf.ext to: hosts = localhost base = dc=nodomain - In conf.d/10-master.conf, in section "service auth-worker", set executable = /usr/bin/valgrind /usr/lib/dovecot/auth -w (path may differ on your system) - Install an LDAP server with a database for dc=nodomain; this is trivial to do with debian: Simply install slapd and systemctl start slapd. - Start dovecot - Run doveadm user '*' - You should find the error in the mail.log. I hope this is somehow useful to fix our crash issue. We’ll be happy to provide more information as needed. kind regards, Jonas

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