Hi Tom,
> Please keep replies on-list, don't e-mail me privately.
A mistake & my apologies. Fail2ban mailing list sets the From address as the
senders email, not the list’s email. Pressing Reply will reply to your private
email. The To: has to be manually edited on each reply :(
Dovecor details below:
Debian 9.2
$ dpkg -l fail2ban
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-========================-=================-=================-=====================================================
ii fail2ban 0.9.6-2 all ban hosts that
cause multiple authentication errors
$ cat /etc/fail2ban/filter.d/dovecot.conf|grep -v ^#
[INCLUDES]
before = common.conf
[Definition]
_daemon = (auth|dovecot(-auth)?|auth-worker)
failregex =
^%(__prefix_line)s(?:%(__pam_auth)s(?:\(dovecot:auth\))?:)?\s+authentication
failure; logname=\S* uid=\S* euid=\S* tty=dovecot ruser=\S*
rhost=<HOST>(?:\s+user=\S*)?\s*$
^%(__prefix_line)s(?:pop3|imap)-login: (?:Info: )?(?:Aborted
login|Disconnected)(?::(?: [^ \(]+)+)? \((?:auth failed, \d+ attempts( in \d+
secs)?|tried to use (disabled|disallowed) \S+ auth)\):( user=<[^>]+>,)?(
method=\S+,)? rip=<HOST>(?:, lip=\S+)?(?:, TLS(?: handshaking(?::
SSL_accept\(\) failed: error:[\dA-F]+:SSL
routines:[TLS\d]+_GET_CLIENT_HELLO:unknown protocol)?)?(: Disconnected)?)?(,
session=<\S+>)?\s*$
^%(__prefix_line)s(?:Info|dovecot:
auth\(default\)|auth-worker\(\d+\)): pam\(\S+,<HOST>\): pam_authenticate\(\)
failed: (User not known to the underlying authentication module: \d+
Time\(s\)|Authentication failure \(password mismatch\?\))\s*$
^%(__prefix_line)s(?:auth|auth-worker\(\d+\)):
(?:pam|passwd-file)\(\S+,<HOST>\): unknown user\s*$
^%(__prefix_line)s(?:auth|auth-worker\(\d+\)): Info:
ldap\(\S*,<HOST>,\S*\): invalid credentials\s*$
ignoreregex =
[Init]
journalmatch = _SYSTEMD_UNIT=dovecot.service
> On 13 Mar 2018, at 11:07, Tom Hendrikx <[email protected]> wrote:
>
> Hi,
>
> Please keep replies on-list, don't e-mail me privately.
>
> Can you post:
> - OS version you're running
> - fail2ban version you're running
> - contents of the /etc/fail2ban/filter.d/dovecot.conf file, so we can
> extend the current regex
>
> For nginx, please create a new thread and supply the same information,
> along with some sample log lines.
>
> Kind regards,
>
> Tom
>
>
> On 12-03-18 21:03, Sophie Loewenthal wrote:
>> Hi, Thanks for the fail2ban-regex checker. I checked nginx and this also
>> seemed not to work. Again I have the ciphers listed when they connect.
>>
>>
>>
>> **** NGINX *****
>> # fail2ban-regex mx10.example.co.uk_access.log '^<HOST> \- \S+ \[\]
>> \"(GET|POST|HEAD) \/<block> \S+\" 404 .+$'
>> Running tests
>> =============
>> Use failregex line : ^<HOST> \- \S+ \[\] \"(GET|POST|HEAD) \/<block> \S...
>> Use log file : mx10.example.co.uk_access.log
>> Use encoding : UTF-8
>>
>> Results
>> =======
>> Failregex: 0 total
>> Ignoreregex: 0 total
>> Date template hits:
>> |- [# of hits] date format
>> | [10] Day(?P<_sep>[-/])MON(?P=_sep)Year[
>> :]?24hour:Minute:Second(?:\.Microseconds)?(?: Zone offset)?
>> `-
>>
>> Lines: 10 lines, 0 ignored, 0 matched, 10 missed
>> [processed in 0.00 sec]
>>
>> |- Missed line(s):
>> | 207.46.13.127 - - [12/Mar/2018:11:52:42 +0000]
>> TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "GET / HTTP/1.1" 302 5 "-" "Mozilla/5.0
>> (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)"
>> | 184.105.247.194 - - [12/Mar/2018:14:25:42 +0000]
>> TLSv1.2/ECDHE-RSA-AES128-GCM-SHA256 "GET / HTTP/1.1" 302 5 "-" "-"
>> | 183.129.160.229 - - [12/Mar/2018:15:21:21 +0000]
>> TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "GET
>> /farm/libs/modules/tween/tween.min.js HTTP/1.1" 404 162 "-" "Mozilla/5.0
>> (Macintosh; Intel Mac OS X 10.11; rv:47.0) Gecko/20100101 Firefox/47.0"
>> | 207.46.13.104 - - [12/Mar/2018:15:48:45 +0000]
>> TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "GET / HTTP/1.1" 302 5 "-" "Mozilla/5.0
>> (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)"
>> | 207.46.13.127 - - [12/Mar/2018:16:15:41 +0000]
>> TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "GET / HTTP/1.1" 302 5 "-" "Mozilla/5.0
>> (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)"
>> | 66.249.75.148 - - [12/Mar/2018:16:37:47 +0000]
>> TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "GET /robots.txt HTTP/1.1" 404 162 "-"
>> "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
>> | 66.249.75.144 - - [12/Mar/2018:16:37:47 +0000]
>> TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "GET /ads.txt HTTP/1.1" 404 162 "-"
>> "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
>> | 207.46.13.45 - - [12/Mar/2018:19:01:28 +0000]
>> TLSv1.2/DHE-RSA-AES256-GCM-SHA384 "GET /robots.txt HTTP/1.1" 404 162 "-"
>> "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)"
>> | 207.46.13.45 - - [12/Mar/2018:19:01:29 +0000]
>> TLSv1.2/DHE-RSA-AES256-GCM-SHA384 "GET /robots.txt HTTP/1.1" 404 162 "-"
>> "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)"
>> | 40.77.167.54 - - [12/Mar/2018:19:01:34 +0000]
>> TLSv1.2/ECDHE-RSA-AES256-GCM-SHA384 "GET / HTTP/1.1" 302 5 "-" "Mozilla/5.0
>> (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)"
>> `-
>>
>>
>>
>>
>>
>> ***** DOVECOT ******
>> # fail2ban-regex /var/log/mail.log '^%(__prefix_line)s(?:pop3|imap)-login:
>> (?:Info: )?(?:Aborted login|Disconnected)(?::(?: [^ \(]+)+)? \((?:auth
>> failed, \d+ attempts( in \d+ secs)?|tried to use (disabled|disallowed) \S+
>> auth)\):( user=<[^>]+>,)?( method=\S+,)? rip=<HOST>(?:, lip=\S+)?(?:, TLS(?:
>> handshaking(?:: SSL_accept\(\) failed: error:[\dA-F]+:SSL
>> routines:[TLS\d]+_GET_CLIENT_HELLO:unknown protocol)?)?(: Disconnected)?)?(,
>> session=<\S+>)?\s*$'
>>
>> Running tests
>> =============
>> Use failregex line : ^%(__prefix_line)s(?:pop3|imap)-login: (?:Info: )?...
>> Use log file : /var/log/mail.log
>> Use encoding : UTF-8
>>
>> Results
>> =======
>> Failregex: 0 total
>> Ignoreregex: 0 total
>> Date template hits:
>> |- [# of hits] date format
>> | [3014] (?:DAY )?MON Day 24hour:Minute:Second(?:\.Microseconds)?(?: Year)?
>> `-
>>
>> Lines: 3014 lines, 0 ignored, 0 matched, 3014 missed
>> [processed in 0.38 sec]
>> Missed line(s): too many to print. Use --print-all-missed to print all 3014
>> lines
>>
>>
>>
>> best,
>> Sophie
>>
>>
>>
>>
>>
>>> On 12 Mar 2018, at 10:47, Tom Hendrikx <[email protected]> wrote:
>>>
>>> Hi,
>>>
>>>
>>> you can test this using the fail2ban-regex tool. When I use one of your
>>> example lines, it doesn't match on my setup (ubuntu 16.04, fail2ban
>>> 0.9.3). The similar logline from own setup doesn match:
>>>
>>> Feb 19 03:02:33 alison dovecot: imap-login: Disconnected (auth failed, 1
>>> attempts in 7 secs): user=<[email protected]>, method=PLAIN,
>>> rip=127.0.0.1, lip=127.0.0.1, TLS, session=<e1LxFYdlwKbes9bZ>
>>>
>>> The latest config file for dovecot in github is completely different
>>> from the one I'm using, but also lacks support for this AFAICS.
>>>
>>> I guess we could come up with a regex that would support your log lines too.
>>>
>>> Kind regards,
>>> Tom
>>>
>>> On 12-03-18 10:02, Sophie Loewenthal wrote:
>>>> Hi,
>>>>
>>>> Sorry for the delay. Flu.
>>>>
>>>> Will fail2ban act on these example lines below with the extra cipher
>>>> details?
>>>>
>>>> I know the lines below would not trigger actions because there are not
>>>> enough failures in the log. Normally dovecot does not have the TLS/cipher
>>>> part logged. Will the regexes still matched correctly?
>>>>
>>>>
>>>> Mar 11 08:52:04 mx10 dovecot: imap-login: Disconnected (auth failed, 1
>>>> attempts in 2 secs): [email protected]>, method=PLAIN,
>>>> rip=125.69.11.254, lip=10.1.1.100, TLS: Disconnected, TLSv1 with cipher
>>>> DHE-RSA-AES256-SHA (256/256 bits)
>>>> Mar 11 10:18:24 mx10 dovecot: imap-login: Disconnected (auth failed, 1
>>>> attempts in 2 secs): [email protected]>, method=PLAIN, rip=37.59.8.29,
>>>> lip=10.1.1.100, TLS: Disconnected, TLSv1 with cipher ECDHE-RSA-AES256-SHA
>>>> (256/256 bits)
>>>> Mar 11 11:48:04 mx10 dovecot: imap-login: Disconnected (auth failed, 1
>>>> attempts in 2 secs): [email protected]>, method=PLAIN,
>>>> rip=178.216.98.75, lip=10.1.1.100, TLS: Disconnected, TLSv1 with cipher
>>>> ECDHE-RSA-AES256-SHA (256/256 bits)
>>>> Mar 11 13:37:39 mx10 dovecot: imap-login: Aborted login (auth failed, 4
>>>> attempts in 26 secs): junk4>, method=PLAIN, rip=71.213.169.18,
>>>> lip=10.1.1.100, TLS, TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
>>>> Mar 11 13:37:40 mx10 dovecot: imap-login: Aborted login (auth failed, 4
>>>> attempts in 26 secs): junk4>, method=PLAIN, rip=187.67.197.100,
>>>> lip=10.1.1.100, TLS, TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
>>>> Mar 11 22:35:24 mx10 dovecot: imap-login: Disconnected (auth failed, 1
>>>> attempts in 2 secs): [email protected]>, method=PLAIN,
>>>> rip=182.100.218.83, lip=10.1.1.100, TLS, TLSv1 with cipher
>>>> DHE-RSA-AES256-SHA (256/256 bits)
>>>>
>>>>
>>>> The jails are enabled in the config. I’ve not see a match for 3 months
>>>> since I installed the server.
>>>> [dovecot]
>>>> port = imap,imaps,sieve
>>>> logpath = %(dovecot_log)s
>>>> backend = %(dovecot_backend)s
>>>>
>>>> [sieve]
>>>> port = smtp,465,submission
>>>> logpath = %(dovecot_log)s
>>>> backend = %(dovecot_backend)s
>>>>
>>>>
>>>>
>>>>
>>>>> On 6 Mar 2018, at 10:50, Tom Hendrikx <[email protected]> wrote:
>>>>>
>>>>>
>>>>>
>>>>> On 06-03-18 08:59, Sophie Loewenthal wrote:
>>>>>> Morning,
>>>>>>
>>>>>> My logging from and postfix dovecot is in this format:
>>>>>>
>>>>>> Mar 6 07:49:45 mx dovecot: imap-login: Login: [email protected]>,
>>>>>> method=PLAIN, rip=94.19.2.3, lip=1.31.1.3, mpid=10655, TLS, TLSv1.2 with
>>>>>> cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
>>>>>>
>>>>>> Mar 6 07:55:36 mx postfix/smtpd[10793]: Anonymous TLS connection
>>>>>> established from unknown[94.19.2.3]: TLSv1.2 with cipher
>>>>>> ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
>>>>>>
>>>>>> How can I adapt the filter to pick this up? I don’t think the regex in
>>>>>> filter.d/postfix.conf|dovecot.conf will pick these changed lines up
>>>>>> because they have the ciphers included, will they?
>>>>>
>>>>> Lines that are not understood/matched by fail2ban are ignored.
>>>>>
>>>>> I don't think these lines signify anything that fail2ban should act on,
>>>>> but please explain what you would like fail2ban to do, based on those
>>>>> log lines?
>>>>>
>>>>>>
>>>>>> Best wishes,
>>>>>>
>>>>>> Sophie
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------------
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>>>>>>
>>>>>
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>>>>
>>>>
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>>>
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>>
>
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