ot: fail2ban dovecot setup

[Alex JOST]

Am 17.12.2017 um 00:56 schrieb voytek at sbt.net.au:
> I'm trying to setup and test fail2ban with dovecot
> 
> I've installed fail2ban, I've copied config from
> https://wiki2.dovecot.org/HowTo/Fail2Ban, and, trying to test it,
> 
> attempted multiple mail access with wrong password, but, get this:
> 
> # fail2ban-client status dovecot-pop3imap
> Status for the jail: dovecot-pop3imap
> |- Filter
> |  |- Currently failed: 0
> |  |- Total failed:     0
> |  `- File list:        /var/log/dovecot.log
> `- Actions
>     |- Currently banned: 0
>     |- Total banned:     0
>     `- Banned IP list:
> 
> # grep 'auth fail' /var/log/dovecot.log | grep voytek at k | wc
>       19     367    3749
> 
> and
> 
> Dec 17 09:55:03 imap-login: Info: Disconnected (auth failed, 2 attempts in
> 5 secs): user=<voytek at k..au>, method=PLAIN, rip=110.175.246.167,
> lip=163.47.110.7, TLS, session=<bQ6mAX1gHcRur/an>
> Dec 17 09:55:12 imap-login: Info: Disconnected (auth failed, 2 attempts in
> 4 secs): user=<voytek at k..au>, method=PLAIN, rip=110.175.246.167,
> lip=163.47.110.7, TLS, session=<Osk5An1gAKVur/an>
> Dec 17 09:55:20 imap-login: Info: Disconnected (auth failed, 2 attempts in
> 4 secs): user=<voytek at k..au>, method=PLAIN, rip=110.175.246.167,
> lip=163.47.110.7, TLS, session=<xsq/An1gDN1ur/an>
> Dec 17 09:55:27 imap-login: Info: Disconnected (auth failed, 2 attempts in
> 4 secs): user=<voytek at k..au>, method=PLAIN, rip=110.175.246.167,
> lip=163.47.110.7, TLS, session=<RVUkA31gm4xur/an>
> 
> 
> # cat dovecot-pop3imap.conf
> [Definition]
> failregex = (?: pop3-login|imap-login): (?:Authentication failure|Aborted
> login \(auth failed|Aborted login \(tried to use disabled|Disconnected
> \(auth failed).*rip=(?P<host>\S*),.*
> ignoreregex =
> 
> 
> # systemctl status  fail2ban
> ● fail2ban.service - Fail2Ban Service
>     Loaded: loaded (/usr/lib/systemd/system/fail2ban.service; enabled;
> vendor preset: disabled)
>     Active: active (running) since Sat 2017-12-16 22:35:14 AEDT; 12h ago
>       Docs: man:fail2ban(1)
>    Process: 2034 ExecStop=/usr/bin/fail2ban-client stop (code=exited,
> status=0/SUCCESS)
>    Process: 6024 ExecReload=/usr/bin/fail2ban-client reload (code=exited,
> status=0/SUCCESS)
>    Process: 2036 ExecStart=/usr/bin/fail2ban-client -x start (code=exited,
> status=0/SUCCESS)
>   Main PID: 2039 (fail2ban-server)
>     CGroup: /system.slice/fail2ban.service
>             └─2039 /usr/bin/python2 -s /usr/bin/fail2ban-server -s
> /var/run/fail2ban/fail2ban.sock -p /var/ru...
> 
> Dec 16 22:35:14  systemd[1]: Starting Fail2Ban Service...
> Dec 16 22:35:14  fail2ban-client[2036]: 2017-12-16 22:35:14,657
> fail2ban.server         [2...9.7
> Dec 16 22:35:14  fail2ban-client[2036]: 2017-12-16 22:35:14,657
> fail2ban.server         [2...ode
> Dec 16 22:35:14  systemd[1]: Started Fail2Ban Service.
> Dec 17 09:21:51  systemd[1]: Reloaded Fail2Ban Service.
> Dec 17 09:22:52  systemd[1]: Reloaded Fail2Ban Service.
> Dec 17 09:31:40  systemd[1]: Reloaded Fail2Ban Service.
> Hint: Some lines were ellipsized, use -l to show in full.

Did you enable the dovecot service in fail2ban? By default all jails are 
disabled.

/etc/fail2ban/jail.conf:
   [dovecot]
   enabled = true

-- 
Alex JOST