April 2016 - dovecot - dovecot.org

Looking for NTLM config example
by Mark Foley 26 Oct '17

26 Oct '17

Now that I am running Thunderbird on Linux and away from Windows/Outlook, I'd like to take another run at setting up NTLM authentication from Thunderbird to my Samba4 AC/DC. With the help of the samba maillist folks I was able to set up NTLM authentication for domain user login. I should be able to do the same for email! But, I need help. I went to http://wiki2.dovecot.org/Authentication/Mechanisms/NTLM and got lost immediately. Are "authenticaion submethods" synonymous with "password schemes"? The 7th line down says, "NTLM password scheme is required for NTLM, NTLM2 and NTLMv2.", but in the referenced link I found no reference to "NTLM password scheme". The links http://wiki2.dovecot.org/Authentication/Mechanisms/NTLM and http://wiki2.dovecot.org/Authentication/PasswordSchemes, tell you what the 4 NTLM authentication submethods are, tells you what password schemes are, tells you what the NTLM client/server handshake is, but doesn't actually tell you how to configure dovecot config files. I'm much more interested in the "how to" than in: "NTLMv2: server and client nonce, MITM can't force downgrade" ... whatever that means. Anyway, probably it's my lack of understanding terminology. I don't even know what a "nonce" is. But, I learn well from examples! Can somone please give me a sample 10-auth.conf for NTML and any other supporting settings or configs I need? My current/working dovecot settings, which have been running perfectly for well over a year now, are: $ dovecot -n # 2.2.15: /usr/local/etc/dovecot/dovecot.conf # OS: Linux 3.10.17 x86_64 Slackware 14.1 auth_debug_passwords = yes auth_mechanisms = plain login 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/2015-08-14/57aa6ed6ae98b4c7.crt ssl_key = </etc/ssl/certs/OHPRS/GoDaddy/my.server.name.key userdb { driver = passwd } verbose_ssl = yes Here's what I've tried so far as 10-auth.conf: disable_plaintext_auth = no auth_use_winbind = yes info_log_path = /var/log/dovecot_info auth_verbose = yes auth_debug_passwords = yes auth_verbose_passwords= plain auth_winbind_helper_path = /usr/bin/ntlm_auth auth_mechanisms = ntlm plain login userdb { driver = passwd args = username_format=%n allow_all_users=yes } Which gives me a dovecot -n of: $ dovecot -n # 2.2.15: /usr/local/etc/dovecot/dovecot.conf # OS: Linux 3.10.17 x86_64 Slackware 14.1 auth_debug_passwords = yes auth_mechanisms = ntlm plain login auth_use_winbind = yes auth_verbose = yes auth_verbose_passwords = plain disable_plaintext_auth = no info_log_path = /var/log/dovecot_info mail_location = maildir:~/Maildir protocols = imap ssl_cert = </etc/ssl/certs/OHPRS/GoDaddy/Apache/2015-08-14/57aa6ed6ae98b4c7.crt ssl_key = </etc/ssl/certs/OHPRS/GoDaddy/my.server.name.key userdb { args = username_format=%n allow_all_users=yes driver = passwd } verbose_ssl = yes I configured Thunderbird for NTLM authentication, then tried sending a message, I got the following in /var/log/dovecot_info: Apr 22 01:37:57 imap-login: Debug: SSL: elliptic curve secp384r1 will be used for ECDH and ECDHE key exchanges Apr 22 01:37:57 imap-login: Debug: SSL: elliptic curve secp384r1 will be used for ECDH and ECDHE key exchanges Apr 22 01:37:57 auth: Debug: Loading modules from directory: /usr/local/lib/dovecot/auth Apr 22 01:37:57 imap-login: Info: Disconnected: Auth process broken (disconnected before auth was ready, waited 0 secs): user=<>, rip=192.168.0.58, lip=98.102.63.107, session=<xFuyOgwx9wDAqAA6> On Thunderbird I got the error, "Sending of the message failed. The Outlgoing server (SMTP) my.server.name does not support the selected authentication method. Please change the 'Autnentication method' in 'Account Settings | Outgoing Server (SMTP)'." Clearly, something is configured wrong, but I've no clue what. Can I get some advice? THX --Mark

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Quota-status service on Director
by Michael Kliewe 27 Sep '17

27 Sep '17

Hello, I'm trying to configure the quota-status service, but it seems I'm not successful with my director setup (2.2.9). I activate the quota-status service like this on my director server: $ cat 91-quota-status.conf ## ## Quota-Status configuration. ## # Load Module quota-status and listen on TCP/IP Port for connections. service quota-status { executable = quota-status -p postfix inet_listener { address = 10.0.1.44 port = 12340 } client_limit = 1 } # Plugin configuration. # Return messages for requests by quota status: success, nouser and overquota. plugin { quota_status_success = DUNNO quota_status_nouser = DUNNO quota_status_overquota = "552 5.2.2 Mailbox is over quota" } After restarting the director service I try to query the quota status service: printf "recipient=user(a)domain.de\nsize=100000\n\n" | nc 10.0.1.44 12340 The output is: action=DEFER_IF_PERMIT Invalid user settings. Refer to server log for more information. In the debug log of the director I see this: Feb 23 03:03:09 director01 dovecot: auth: Debug: userdb out: USER 1 user(a)domain.de mail=mdbox:/mnt/data01/domain.de/user/maildir home=/mnt/data01/domain.de/user proxy=Y master=<hidden> pass=<hidden> uid=5000 gid=1 quota_rule=*:storage=60593 quota_rule2=*:messages=100000 Feb 23 03:03:09 director01 dovecot: quota-status(user(a)domain.de): Error: user user(a)domain.de: Initialization failed: Namespace '': mkdir(/mnt/data01/domain.de/user/maildir/mailboxes) failed: Permission denied (euid=5000(vmail) egid=1(daemon) missing +w perm: /mnt, dir owned by 0:0 mode=0755) So the quota status service tries to access the mailbox of the user ON THE DIRECTOR. But the director has not mounted the mailboxes of the users, that's what the backend dovecots are for (proxy=Y). So the quota-status query is not proxied to the dovecot backend server I would assume. Does that mean I have to start the quota-status service on the dovecot backend servers and access it from the Postfix server directly? Currently the Postfixes can only reach the directors, not the backend servers. Is it possible to use the quota-status service on the director? Thanks for any hints and help Michael

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[Dovecot] [PATCH, RFC] add APOP authentication mechanism
by Andrey Panin 14 Aug '17

14 Aug '17

Hello all, this patch add APOP authentication mechanism to dovecot 1.0-test23. Please take a look. Best regards. -- Andrey Panin | Linux and UNIX system administrator pazke(a)donpac.ru | PGP key: wwwkeys.pgp.net

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[Dovecot] Dovecot stops with "Fatal: kevent(): Invalid argument"
by Henrik Larsson 09 Jun '17

09 Jun '17

# 2.0.11: /usr/local/etc/dovecot/dovecot.conf # OS: FreeBSD 8.2-STABLE amd64 Dovecot stops with the following logged: - master: Fatal: kevent(): Invalid argument I have found that a diff was created for "src/lib/ioloop-kqueue.c" for a similar issue: http://dovecot.org/pipermail/dovecot/2010-November/054855.html I have patched my system with this and haven't seen the problem since, but I don't know if this is a coincidence. Could you please explain if the diff should actually fix anything or just add some more logging in case it stops again? Best regards Henrik Larsson

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antispam plugin pipe backend error when moving multiple emails
by Stéphane Cottin 12 Feb '17

12 Feb '17

Hi, I've got some trouble with the dovecot antispam plugin and the pipe backend. I'm using dovecot 2.2.18 with maildirs and zlib compression enabled. When moving 2 or more emails at once from the Junk folder to another one, I always have the following error : "Failed to copy to temporary file" In the server logs : imap(vvv(a)vvv.vvv): Error: read(zlib(/data/Maildir/.test/tmp/1446974366.M123890P936.vvv)) failed: Cached message size smaller than expected (13553 < 13562, box=test, UID=0) The same operation with one email at a time, on the same emails, works as expected. Stéphane

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Reappearing emails
by Ron Cleven 17 Jan '17

17 Jan '17

We have been running Dovecot 2.2.10 with a pair of CentOS 7 boxes with replications for the past year. We have been quite happy with the performance and reliability. Recently we received a report from an Android IMAP user that emails that he deleted without reading would often reappear in his INBOX. At first I thought it might be some quirky incompatibility with his email client, but I found that I could easily reproduce it in Roundcube by dragging an unread email to Trash. I have been monitoring this forum fairly religiously and don't recall seeing any similar reports. I plan to capture the IMAP wire interactions, but before doing that, I thought I would submit this to the IMAP gods to see if anyone had heard of this and/or if there is some newer version that might resolve the problem. This particular customer contacted his email vendor and asked them to analyze the problem. The actual log data is gigantic, so I just pasted in the vendor's narrative below in case it helps. Otherwise, as I said, I will capture a similar interaction at the wire level and follow up here. Vendor's narrative: You had 8 messages in the Inbox, and moved two to Trash. The server notified the app on the push connection (for Inbox) that there are now 6 messages. By the time the app got around to catch up with that (it did the Trash folder first), the server said "oh wait, there are 8 messages, not 6" (in the Inbox), and so the app synced them in, just as reported. app selecting the Inbox, server saying there are 8 messages there app moving UID 729 and 730 to Trash (push) server saying Trash now has 34 messages (push) server saying two messages gone from Inbox, 6 left (push) 6 messages left in Inbox becoming 8 (push) and here they are (the two new ones) Thanks, Ron

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imapc fetch optimization
by Nagy, Attila 27 Sep '16

27 Sep '16

Hi, imapc does a lot of UID FETCH $UID (BODY.PEEK[]), which is nice, because it works even with the dumbest IMAP server, altough it really kills performance, especially on high latency lines. I wonder: if IMAP servers can effectively handle boundless fetches (like a list with all wanted UIDs, or simply 1:* if all are needed), do you see this as a good addition to develop? This could be a new imapc_features setting afterall... Thanks,

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[Dovecot] Plugins: virtuals vs acls
by Leho Kraav 20 Sep '16

20 Sep '16

Hi all dovecot-virtual: * all when dovecot-acl files restrict some subset of * for a user, does dovecot respect these ACLs when collecting messages for virtual folder? I'd like a confirmation about what I should be seeing when I start implementing this setup.

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Error: istream-seekable: safe_mkstemp(/tmp/dovecot.imap.) failed
by Thomas Leuxner 05 Sep '16

05 Sep '16

I'm seeing these recently: Feb 27 09:24:01 nihlus dovecot: imap(tlx(a)leuxner.net): Error: istream-seekable: safe_mkstemp(/tmp/dovecot.imap.) failed: No such file or directory Feb 27 09:24:01 nihlus dovecot: imap(tlx(a)leuxner.net): Error: istream-seekable: safe_mkstemp(/tmp/dovecot.imap.) failed: No such file or directory Feb 27 09:24:01 nihlus dovecot: imap(tlx(a)leuxner.net): Error: istream-seekable: safe_mkstemp(/tmp/dovecot.imap.) failed: No such file or directory Feb 27 09:24:01 nihlus dovecot: imap(tlx(a)leuxner.net): Error: istream-seekable: safe_mkstemp(/tmp/dovecot.imap.) failed: No such file or directory Feb 27 09:24:01 nihlus dovecot: imap(tlx(a)leuxner.net): Error: istream-seekable: safe_mkstemp(/tmp/dovecot.imap.) failed: No such file or directory Feb 27 09:24:01 nihlus dovecot: imap(tlx(a)leuxner.net): Error: istream-seekable: safe_mkstemp(/tmp/dovecot.imap.) failed: No such file or directory $ doveconf -n | head # 2.2.devel (f1a9b58): /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.devel (0de2a19) Regards Thomas

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ACL List uses wrong namespace for permissions
by Harald Leithner 31 Aug '16

31 Aug '16

Hi, I'm using dovecot 2.2.devel (11c704a) with lazyexpunge and shared Mailboxes, this seams to work since the latest patch. There is only one problem creating the correct dovecot-acl-list, if I login as the normal user that has set permissions for another user everything is ok. If I login with the same user but with a modified roundcube that uses the #EXPUNGED Namespace as root, dovecot overrides the correct dovecot-acl-list with an empty version. I think this is the most interesting part of the log: 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: fs: root=/srv/storage1/vmail/company/628, index=, indexpvt=, control=, inbox=, alt= 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl: initializing backend with data: vfile 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl: acl username = user(a)company.at 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl: owner = 1 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl vfile: Global ACLs disabled 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: Namespace : type=private, prefix=#EXPUNGED/, sep=, inbox=no, hidden=yes, list=no, subscriptions=no location=mdbox:/srv/storage1/vmail/company/628:MAILBOXDIR=expunged 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: fs: root=/srv/storage1/vmail/company/628, index=, indexpvt=, control=, inbox=, alt= 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl: initializing backend with data: vfile 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl: acl username = user(a)company.at 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl: owner = 1 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl vfile: Global ACLs disabled 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: Namespace : type=shared, prefix=#Users/%u/, sep=/, inbox=no, hidden=no, list=children, subscriptions=yes location=mdbox:/srv/storage1/vmail%h 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: shared: root=/var/run/dovecot, index=, indexpvt=, control=, inbox=, alt= 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl vfile: file /srv/storage1/vmail/company/628/mailboxes/dovecot-acl not found 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: Namespace : Using permissions from /srv/storage1/vmail/company/628: mode=0700 gid=default 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl vfile: file /srv/storage1/vmail/company/628/mailboxes/Drafts/dbox-Mails/dovecot-acl not found 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl vfile: file /srv/storage1/vmail/company/628/expunged/dovecot-acl not found 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: Namespace #EXPUNGED/: Using permissions from /srv/storage1/vmail/company/628: mode=0700 gid=default 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl vfile: file /srv/storage1/vmail/company/628/expunged/INBOX/dbox-Mails/dovecot-acl not found 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl vfile: file /srv/storage1/vmail/company/628/expunged/INBOX/test/dbox-Mails/dovecot-acl not found 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Debug: acl vfile: reading file /srv/storage1/vmail/company/628/mailboxes/INBOX/dbox-Mails/dovecot-acl 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Logged out in=178 out=870 2016-04-26T16:49:26+02:00 mailstore1 dovecot: imap(user(a)company.at): Logged out in=315 out=27172 regards, -- Harald Leithner ITronic Wiedner Hauptstraße 120/5.1, 1050 Wien, Austria Tel: +43-1-545 0 604 Mobil: +43-699-123 78 4 78 Mail: leithner(a)itronic.at | itronic.at

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