- dovecot - dovecot.org

[Dovecot] namespace delivery question
by Laszlo Kiraly 04 Jul '13

04 Jul '13

Hi list, I like to have public mailboxes in addition to other private in the same domain, and manage the public mailbox permissions through acls. For example: info(a)domain.com <- public, readable by user2 user1(a)domain.com <- private user2(a)domain.com <- private The mailboxes are virtual, authentication through pam (kerberos). The public mailbox doesn't have valid kerberos account. My smtp server is exim 4.80. I set the mail delivery to lmtp. I couldn't find solution in the documentation, how can I manage the email delivery to the public namespace? There is a -m option in the lda delivery where you can give namespace prefix. Maybe it's good for this, but I couldn't find any information how can I do this with lmtp? my dovecot config: test:~# dovecot -n # 2.1.7: /etc/dovecot/dovecot.conf # OS: Linux 3.0.0-1-686-pae i686 Debian squeeze/sid 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 namespace { location = sdbox:/home/vmail/public/%u prefix = public. separator = . subscriptions = no type = public } namespace inbox { inbox = yes location = sdbox:/home/vmail/private/%n mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Spam { auto = subscribe special_use = \Junk } mailbox Trash { auto = subscribe special_use = \Trash } prefix = separator = . } passdb { driver = pam } plugin { acl = vfile sieve = /home/vmail/%n/.dovecot.sieve sieve_dir = /home/vmail/%n sieve_global_dir = /home/vmail/sieve } protocols = " imap lmtp sieve" service managesieve-login { inet_listener sieve { port = 4190 } service_count = 1 } ssl_cert = </etc/dovecot/dovecot.pem ssl_key = </etc/dovecot/private/dovecot.pem userdb { args = uid=1035 gid=8 home=/home/vmail/%Lu allow_all_users=yes driver = static } protocol lmtp { mail_plugins = " sieve" } protocol lda { mail_plugins = " sieve" } protocol sieve { mail_max_userip_connections = 10 managesieve_implementation_string = Dovecot Pigeonhole managesieve_logout_format = bytes=%i/%o managesieve_max_line_length = 65536 } Best regards: László Király

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[Dovecot] dnsbl feature for dovecot
by John Fawcett 04 Jul '13

04 Jul '13

dnsbl's are a popular method to prevent listed ips from making connections to mta software. cf. postscreen_dnsbl_sites in postfix Would it be possible to introduce such a feature in dovecot, so that connections can be denied based on a dnsbl lookup (where the precise dnsbls used are configurable)? John

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[Dovecot] tcpwrappers
by lejeczek 04 Jul '13

04 Jul '13

hi everybody having I believe sort of plain-vanilla config with section in 10-tcpwrapper.conf as per docs login_access_sockets = tcpwrap service tcpwrap { unix_listener login/tcpwrap { group = $default_login_user mode = 0600 user = $default_login_user } } /etc/hosts.deny contains: ALL: given_host and yet dovecot logins IMAP client in whereas other tcpwrapper aware services act as expected what am I missing? regards

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[Dovecot] flat file in tmpfs for dict quota
by Ken A 04 Jul '13

04 Jul '13

I'm using dict quota like so: quota = dict:User quota::file:/[path]/quotas/%u [path]/quotas/ is a tmpfs. The idea is to do less work on disk. Other than forcing dovecot to rebuild quotas on a reboot, are there any downsides? Thanks, Ken -- Ken Anderson Pacific Internet - http://www.pacific.net

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Re: [Dovecot] dnsbl feature for dovecot
by Joseph Tam 04 Jul '13

04 Jul '13

Professa Dementia writes: > 2) Fail2Ban with rules that seem like they are pretty weak, but trust > me, they work fine and you limit complaints from users. > > a) If you get 3 invalid login attempts within a minute from more than > 1 IP address, block that login for 10 minutes. If you have blocked a > login and another attempt to log in to that account is made then tarpit > that connection. Usually 60 seconds is sufficient. Do not extend the > original block time past the original 10 minutes. > b) If you get 5 invalid login attempts within a minute from the same > IP, block that IP for 5 minutes. This is usually a valid user who > forgot their password, as opposed to a) which is usually a malicious > third party. Looking at my POP3/IMAP logs, users enter wrong passwords all the time, then their mail client keeps trying to re-authenticate, giving the appearance of a slow rolling BFD. For example, I just grabbed this typical sample Jul 2 13:24:48 dovecot: imap-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<x> ... Jul 2 13:26:03 dovecot: imap-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<x> ... Jul 2 13:26:13 dovecot: imap-login: Aborted login (auth failed, 1 attempts in 9 secs): user=<x> ... Jul 2 13:26:37 dovecot: imap-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<x> ... Jul 2 13:26:43 dovecot: imap-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<x> ... Jul 2 13:27:08 dovecot: imap-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<x> ... Jul 2 13:27:14 dovecot: imap-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<x> ... Jul 2 13:27:30 dovecot: imap-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<x> ... Jul 2 13:27:36 dovecot: imap-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<x> ... Jul 2 13:27:51 dovecot: imap-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<x> ... Brute force attempts are more intense, so I think these rules can be set harder to not risk plunking your users into blacklist hell. Also, some common role account (that don't exist on my system e.g. "admin") will trigger an immediate blacklist here -- an easy way to shortcut the process. > I feel your pain and frustration. I do not believe there is an RBL list > of offending IP's for brute force attacks ... Maybe http://www.blocklist.de/en/index.html I use it for ssh BFD blocking, and it detects 2/3 of the IPs trying to do attempts. On their web page, they also list FTP, Web, and Mail login brute forcers, although I'm not sure whether "Mail" logins means IMAP, POP, SMTP-AUTH, or all of them. You can also integrate this with fail2ban so that not only can you use it to block, but can also contribute to the global detection of brute forcers. Joseph Tam <jtam.home(a)gmail.com>

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[Dovecot] Released Pigeonhole v0.4.1 for Dovecot v2.2.4.
by Stephan Bosch 03 Jul '13

03 Jul '13

Hello Dovecot users, Now that I am not preoccupied anymore, I quickly release a new version of Pigeonhole for Dovecot v2.2. This consists mainly of bug fixes. One new feature is that the Sieve plugin will try to pass temporary failures (e.g. from mail storage) back to LDA/LMTP as much as possible. However, this change turned out a little bigger than I would have liked, so experiment with it a bit before you deploy it in production. Changelog v0.4.1: + Added support for handling temporary failures. These are passed back to LDA/LTMP to produce an appropriate response towards the MTA. - Sieve storage: Removed PATH_MAX limitation for active symlink. This caused problems for GNU/Hurd. - Fixed line endings in X-Sieve headers added by redirect command. - ManageSieve: Fixed '[' ']' stupidity for response codes (only happened before login). - Fixed setting name in example-config/conf.d/20-managesieve.conf. - Sieve extprograms plugin: Fixed interaction between pipe command and remote script service. The output from the script service was never read, causing a broken pipe error at the script service. Apparently, this was broken since the I/O handling for extprograms was last revised. - Fixed assertion failure due to datastack problem in message header composition. The release is available as follows: http://www.rename-it.nl/dovecot/2.2/dovecot-2.2-pigeonhole-0.4.1.tar.gz http://www.rename-it.nl/dovecot/2.2/dovecot-2.2-pigeonhole-0.4.1.tar.gz.sig Refer to http://pigeonhole.dovecot.org and the Dovecot v2.x wiki for more information. Have fun testing this new release and don't hesitate to notify me when there are any problems. Regards, -- Stephan Bosch stephan(a)rename-it.nl

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[Dovecot] Creating an authenticated user master user
by Chris Bullock 03 Jul '13

03 Jul '13

dovecot --version 1.1.18 mbox format We are trying to migrate from dovecot to another imap server and need some help migrating the user data to the new server. We have written a perl script to migrate the data but it seems that we need an "authenticated or Master user" in order for the script to access the user mail boxes without the users password. We are using PAM authentication, and root does not have access to the user's mail boxes. Any help would be appreciated. Chris

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[Dovecot] lmtp: Disable Delivered-To header
by Micha Krause 03 Jul '13

03 Jul '13

Hi, using LMTP, is it possible to disable the addition of the Delivered-To header to messages? Micha Krause

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[Dovecot] Who all accessed my dovecot server?
by pvsuja 03 Jul '13

03 Jul '13

Hi, I have set up a mail server with dovecot as IMAP/POP3 server, postfix as MTA and roundcube as web mail client. Other mail clients such as Thunderbird is also being used for mail access. Now as a security policy in our organization, I want to know the IP addresses of the machines from which my mail server was accessed. Is there any monitoring tools to get these details? Regards, Suja -- View this message in context: http://dovecot.2317879.n4.nabble.com/Who-all-accessed-my-dovecot-server-tp4… Sent from the Dovecot mailing list archive at Nabble.com.

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[Dovecot] dovecot corrupted transaction log
by John Fawcett 03 Jul '13

03 Jul '13

Hi I came across this error which happend immedately after a mail delivery to the inbox. Should I look for the problem externally to dovecot (ie. file system, operating system) or within dovecot? I never saw this error before installing 2.2.1, with 2.2.2 I seemed to get even more of them so currently back on 2.2.1 Thanks John Jun 11 00:00:05 rosalia dovecot: imap(myemail@mydomain): Error: Corrupted transaction log file /var/vmail/mydomain/myemail(a)mydomain/dovecot.index.log seq 311: file size shrank (1184 < 1304) (sync_offset=1304) Jun 11 00:00:05 rosalia dovecot: imap(myemail@mydomain): Error: Index /var/vmail/mydomain/myemail(a)mydomain/dovecot.index: Lost log for seq=310 offset=32816 Jun 11 00:00:05 rosalia dovecot: imap(myemail@mydomain): Warning: fscking index file /var/vmail/mydomain/myemail(a)mydomain/dovecot.index Jun 11 00:00:05 rosalia dovecot: imap(myemail@mydomain): Error: Index /var/vmail/mydomain/myemail(a)mydomain/dovecot.index: Lost log for seq=310 offset=32816 Jun 11 00:00:05 rosalia dovecot: imap(myemail@mydomain): Warning: fscking index file /var/vmail/mydomain/myemail(a)mydomain/dovecot.index Jun 11 00:00:05 rosalia dovecot: imap(myemail@mydomain): Error: /var/vmail/mydomain/myemail(a)mydomain/dovecot.index log position went backwards (310,32816 < 311,1304) Jun 11 00:00:05 rosalia dovecot: imap(myemail@mydomain): Error: Index /var/vmail/mydomain/myemail(a)mydomain/dovecot.index: Lost log for seq=310 offset=32816 Jun 11 00:00:05 rosalia dovecot: imap(myemail@mydomain): Warning: fscking index file /var/vmail/mydomain/myemail(a)mydomain/dovecot.index Jun 11 00:00:05 rosalia dovecot: imap(myemail@mydomain): Disconnected: Internal error occurred. Refer to server log for more information. [2013-06-11 00:00:05] in=5596 out=27722 Jun 11 00:02:11 rosalia dovecot: imap-login: Login: user=<myemail@mydomain>, method=PLAIN, rip=81.174.4.175, lip=80.237.194.64, mpid=5824, TLS, session=<lGC47tPexABRrgSv> Jun 11 00:02:11 rosalia dovecot: imap(myemail@mydomain): Error: Transaction log file /var/vmail/mydomain/myemail(a)mydomain/dovecot.index.log: marked corrupted

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