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209 lines
7.5 KiB
Plaintext
209 lines
7.5 KiB
Plaintext
## Version 2022/08/06
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# Fail2Ban configuration file
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#
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# Author: Russell Odom <russ@gloomytrousers.co.uk>
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# Submits attack reports to DShield (http://www.dshield.org/)
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#
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# You MUST configure at least:
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# <port> (the port that's being attacked - use number not name).
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#
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# You SHOULD also provide:
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# <myip> (your public IP address, if it's not the address of eth0)
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# <userid> (your DShield userID, if you have one - recommended, but reports will
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# be used anonymously if not)
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# <protocol> (the protocol in use - defaults to tcp)
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#
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# Best practice is to provide <port> and <protocol> in jail.conf like this:
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# action = dshield[port=1234,protocol=tcp]
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#
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# ...and create "dshield.local" with contents something like this:
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# [Init]
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# myip = 10.0.0.1
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# userid = 12345
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#
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# Other useful configuration values are <mailargs> (you can use for specifying
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# a different sender address for the report e-mails, which should match what is
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# configured at DShield), and <lines>/<minreportinterval>/<maxbufferage> (to
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# configure how often the buffer is flushed).
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#
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[Definition]
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# bypass ban/unban for restored tickets
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norestored = 1
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# Option: actionstart
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# Notes.: command executed on demand at the first ban (or at the start of Fail2Ban if actionstart_on_demand is set to false).
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# Values: CMD
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#
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actionstart =
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# Option: actionstop
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# Notes.: command executed at the stop of jail (or at the end of Fail2Ban)
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# Values: CMD
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#
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actionstop = if [ -f <tmpfile>.buffer ]; then
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cat <tmpfile>.buffer | <mailcmd> "FORMAT DSHIELD USERID <userid> TZ `date +%%z | sed 's/\([+-]..\)\(..\)/\1:\2/'` Fail2Ban" <mailargs> <dest>
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date +%%s > <tmpfile>.lastsent
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fi
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rm -f <tmpfile>.buffer <tmpfile>.first
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# Option: actioncheck
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# Notes.: command executed once before each actionban command
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# Values: CMD
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#
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actioncheck =
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# Option: actionban
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# Notes.: command executed when banning an IP. Take care that the
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# command is executed with Fail2Ban user rights.
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# Tags: See jail.conf(5) man page
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# Values: CMD
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#
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# See http://www.dshield.org/specs.html for more on report format/notes
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#
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# Note: We are currently using <time> for the timestamp because no tag is
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# available to indicate the timestamp of the log message(s) which triggered the
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# ban. Therefore the timestamps we are using in the report, whilst often only a
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# few seconds out, are incorrect. See
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# http://sourceforge.net/tracker/index.php?func=detail&aid=2017795&group_id=121032&atid=689047
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#
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actionban = TZONE=`date +%%z | sed 's/\([+-]..\)\(..\)/\1:\2/'`
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DATETIME="`perl -e '@t=localtime(<time>);printf "%%4d-%%02d-%%02d %%02d:%%02d:%%02d",1900+$t[5],$t[4]+1,$t[3],$t[2],$t[1],$t[0]'` $TZONE"
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PROTOCOL=`awk '{IGNORECASE=1;if($1=="<protocol>"){print $2;exit}}' /etc/protocols`
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if [ -z "$PROTOCOL" ]; then PROTOCOL=<protocol>; fi
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printf %%b "$DATETIME\t<userid>\t<failures>\t<ip>\t<srcport>\t<myip>\t<port>\t$PROTOCOL\t<tcpflags>\n" >> <tmpfile>.buffer
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NOW=`date +%%s`
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if [ ! -f <tmpfile>.first ]; then
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echo <time> | cut -d. -f1 > <tmpfile>.first
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fi
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if [ ! -f <tmpfile>.lastsent ]; then
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echo 0 > <tmpfile>.lastsent
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fi
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LOGAGE=$(($NOW - `cat <tmpfile>.first`))
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LASTREPORT=$(($NOW - `cat <tmpfile>.lastsent`))
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LINES=$( wc -l <tmpfile>.buffer | awk '{ print $1 }' )
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if [ $LINES -ge <lines> && $LASTREPORT -gt <minreportinterval> ] || [ $LOGAGE -gt <maxbufferage> ]; then
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cat <tmpfile>.buffer | <mailcmd> "FORMAT DSHIELD USERID <userid> TZ $TZONE Fail2Ban" <mailargs> <dest>
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rm -f <tmpfile>.buffer <tmpfile>.first
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echo $NOW > <tmpfile>.lastsent
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fi
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# Option: actionunban
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# Notes.: command executed when unbanning an IP. Take care that the
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# command is executed with Fail2Ban user rights.
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# Tags: See jail.conf(5) man page
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# Values: CMD
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#
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actionunban = if [ -f <tmpfile>.first ]; then
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NOW=`date +%%s`
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LOGAGE=$(($NOW - `cat <tmpfile>.first`))
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if [ $LOGAGE -gt <maxbufferage> ]; then
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cat <tmpfile>.buffer | <mailcmd> "FORMAT DSHIELD USERID <userid> TZ `date +%%z | sed 's/\([+-]..\)\(..\)/\1:\2/'` Fail2Ban" <mailargs> <dest>
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rm -f <tmpfile>.buffer <tmpfile>.first
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echo $NOW > <tmpfile>.lastsent
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fi
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fi
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[Init]
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# Option: port
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# Notes.: The target port for the attack (numerical). MUST be provided in the
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# jail config, as it cannot be detected here.
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# Values: [ NUM ]
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#
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port = ???
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# Option: userid
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# Notes.: Your DShield user ID. Should be provided either in the jail config or
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# in a .local file.
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# Register at https://secure.dshield.org/register.html
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# Values: [ NUM ]
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#
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userid = 0
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# Option: myip
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# Notes.: The target IP for the attack (your public IP). Should be provided
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# either in the jail config or in a .local file unless your PUBLIC IP
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# is the first IP assigned to eth0
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# Values: [ an IP address ] Default: Tries to find the IP address of eth0,
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# which in most cases will be a private IP, and therefore incorrect
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#
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myip = `ip -4 addr show dev eth0 | grep inet | head -n 1 | sed -r 's/.*inet ([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}).*/\1/'`
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# Option: protocol
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# Notes.: The protocol over which the attack is happening
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# Values: [ tcp | udp | icmp | (any other protocol name from /etc/protocols) | NUM ] Default: tcp
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#
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protocol = tcp
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# Option: lines
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# Notes.: How many lines to buffer before making a report. Regardless of this,
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# reports are sent a minimum of <minreportinterval> apart, or if the
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# buffer contains an event over <maxbufferage> old, or on shutdown
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# Values: [ NUM ]
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#
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lines = 50
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# Option: minreportinterval
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# Notes.: Minimum period (in seconds) that must elapse before we submit another
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# batch of reports. DShield request a minimum of 1 hour (3600 secs)
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# between reports.
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# Values: [ NUM ]
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#
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minreportinterval = 3600
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# Option: maxbufferage
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# Notes.: Maximum age (in seconds) of the oldest report in the buffer before we
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# submit the batch, even if we haven't reached <lines> yet. Note that
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# this is only checked on each ban/unban, and that we always send
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# anything in the buffer on shutdown. Must be greater than
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# Values: [ NUM ]
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#
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maxbufferage = 21600
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# Option: srcport
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# Notes.: The source port of the attack. You're unlikely to have this info, so
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# you can leave the default
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# Values: [ NUM ]
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#
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srcport = ???
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# Option: tcpflags
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# Notes.: TCP flags on attack. You're unlikely to have this info, so you can
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# leave empty
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# Values: [ STRING ]
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#
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tcpflags =
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# Option: mailcmd
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# Notes.: Your system mail command. Is passed 2 args: subject and recipient
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# Values: CMD
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#
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mailcmd = mail -E 'set escape' -s
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# Option: mailargs
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# Notes.: Additional arguments to mail command. e.g. for standard Unix mail:
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# CC reports to another address:
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# -c me@example.com
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# Appear to come from a different address (the From address must match
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# the one configured at DShield - the '--' indicates arguments to be
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# passed to Sendmail):
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# -- -f me@example.com
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# Values: [ STRING ]
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#
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mailargs =
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# Option: dest
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# Notes.: Destination e-mail address for reports
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# Values: [ STRING ]
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#
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dest = reports@dshield.org
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# Option: tmpfile
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# Notes.: Base name of temporary files used for buffering
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# Values: [ STRING ]
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#
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tmpfile = /var/run/fail2ban/tmp-dshield
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