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сервис_fail2ban

Сервис Fail2ban

Установка

# apt install fail2ban

Настройка

# cat /etc/fail2ban/jail.conf

# ls /etc/fail2ban/jail.d/

# cat /etc/fail2ban/jail.d/defaults-debian.conf

# cat /etc/fail2ban/filter.d/sshd.conf

# cat /etc/fail2ban/filter.d/asterisk.conf
# cat /etc/fail2ban/jail.local
[sshd]
maxretry = 6

[asterisk]
enabled = true
maxretry = 3

Запуск и отладка

# service fail2ban reload
# tail -f /var/log/fail2ban.log

Мониторинг и управление

# fail2ban-client status

# fail2ban-client status asterisk

# fail2ban-client set asterisk unbanip 172.16.1.150

# tail -f /var/log/fail2ban.log

Интеграция fail2ban и cisco log

# cat /etc/fail2ban/jail.d/cisco-change-config.conf
[cisco-change-config]
enabled  = true
maxretry = 1
bantime  = 30
filter   = cisco-change-config
logpath  = /var/log/cisco.log
action   = cisco-backup-config
# cat /etc/fail2ban/filter.d/cisco-change-config.conf
[INCLUDES]

[Definition]

failregex = <HOST>.*Configured from.*
# cat /etc/fail2ban/action.d/cisco-backup-config.conf
[Definition]

actionban = /usr/bin/sshpass -p cisco /usr/bin/scp <ip>:running-config /srv/tftp/<ip>-running-config
            cd /srv/tftp/
            /usr/bin/git add *
            /usr/bin/git status | grep 'modified\|deleted\|new file' | /usr/bin/git commit -a -F -

Интеграция fail2ban и snort

# cat /etc/fail2ban/jail.d/snort_jail.conf
[snort]
enabled     = true
bantime     = 300
filter      = snort_filter
maxretry    = 1
logpath     = /var/log/auth.log
#action      = iptables-allports-forward
#action      = cisco-acl
# cat /etc/fail2ban/filter.d/snort_filter.conf
[INCLUDES]

[Definition]

failregex = .*snort.*Priority: 1.*} <HOST>.*
#        .*snort.*Priority: 2.*} <HOST>.*

ignoreregex =

Блокировка через iptables

# cp /etc/fail2ban/action.d/iptables-allports.conf /etc/fail2ban/action.d/iptables-allports-forward.conf

# cat /etc/fail2ban/action.d/iptables-allports-forward.conf
...
before = iptables-common-forward.conf
...
# cp /etc/fail2ban/action.d/iptables-common.conf /etc/fail2ban/action.d/iptables-common-forward.conf

# cat /etc/fail2ban/action.d/iptables-common-forward.conf
...
chain = FORWARD 
...

Блокировка через cisco acl

# cat /root/cisco-acl-deny.sh
#!/bin/sh

fail2ban-client status snort | grep Banned | cut -d':' -f2 | tr -s ' ' | tr " " "\n" |
while read ip
do
        test -z "$ip" && continue
        echo " deny ip host $ip any"
done
# cat /root/cisco-acl-permit.txt
 permit tcp any host 192.168.X.10 eq 80
 permit tcp any host 192.168.X.10 eq 22
 permit icmp any 192.168.0.0 0.0.255.255
 permit ip any host 172.16.1.X
 permit udp any any
 permit tcp any any established
 deny   ip any any log
end
# cat /root/cisco-change-firewall.sh
#!/bin/sh

cat > /root/firewall.acl <<EOF
no ip access-list extended ACL_FIREWALL
ip access-list extended ACL_FIREWALL
EOF

/root/cisco-acl-deny.sh >> /root/firewall.acl

cat /root/cisco-acl-permit.txt >> /root/firewall.acl

/usr/bin/rcp /root/firewall.acl router:running-config
# cat /etc/fail2ban/action.d/cisco-acl.conf
[Definition]

actionban = /root/cisco-change-firewall.sh

actionunban = /root/cisco-change-firewall.sh

Отладка собственных фильтров

# fail2ban-regex /var/log/tmp_file.log /etc/fail2ban/filter.d/tmp_file_filter.conf
# cat action.d/tmp_file_action.conf
[Definition]

actionban = echo "`date` f2ban detect ip: <ip>" >> /tmp/file_action.log

Дополнительные материалы

Asterisk logs only the local IP

Аsterisk failregex от Владимира Блинова

# less filter.d/asterisk.conf
[INCLUDES]

# Read common prefixes. If any customizations available -- read them from
# common.local
before = common.conf

[Definition]

# Option:  failregex
# Notes.:  regex to match the password failures messages in the logfile. The
#          host must be matched by a group named "host". The tag "<HOST>" can
#          be used for standard IP/hostname matching and is only an alias for
#          (?:::f{4,6}:)?(?P<host>\S+)
# Values:  TEXT
#
failregex = NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Wrong password
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - No matching peer found
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - No matching peer found
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Username/auth name mismatch
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Device does not match ACL
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Peer is not supposed to register
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - ACL error (permit/deny)
            NOTICE.* .*: Registration from '.*' failed for '<HOST>:.*' - Device does not match ACL
            NOTICE.* .*: Registration from '\".*\".*' failed for '<HOST>:.*' - No matching peer found
            NOTICE.* .*: Registration from '\".*\".*' failed for '<HOST>:.*' - Wrong password
            NOTICE.* <HOST> failed to authenticate as '.*'$
            NOTICE.* .*: No registration for peer '.*' \(from <HOST>\)
            NOTICE.* .*: Host <HOST> failed MD5 authentication for '.*' (.*)
            NOTICE.* .*: Failed to authenticate user .*@<HOST>.*
            NOTICE.* .*: <HOST> failed to authenticate as '.*'
            NOTICE.* .*: <HOST> tried  to authenticate with nonexistent user '.*'
            VERBOSE.*SIP/<HOST>-.*Received incoming SIP connection from unknown peer
        NOTICE.* .*: Sending fake auth rejection for device.* \(<HOST>:.*\)
        NOTICE.* .*: Sending fake auth rejection for device .*\<sip:.*\@.*\>;tag=.* \(<HOST>:.*\)
        NOTICE.* .*: Failed to authenticate device .*\<sip:.*\@.*\>;tag=.* \(<HOST>:.*\)
            NOTICE.* .*: Sending fake auth rejection for device.* \(<HOST>:.*\)
            NOTICE.* .*: Sending fake auth rejection for device .*\;tag=.* \(<HOST>:.*\)


# Option:  ignoreregex
# Notes.:  regex to ignore. If this regex matches, the line is ignored.
# Values:  TEXT
#
ignoreregex =

Аsterisk failregex от Стрельникова Романа

failregex = SECURITY.* SecurityEvent="FailedACL".*RemoteAddress=".+?/.+?/<HOST>/.+?".*
            SECURITY.* SecurityEvent="InvalidAccountID".*RemoteAddress=".+?/.+?/<HOST>/.+?".*
            SECURITY.* SecurityEvent="ChallengeResponseFailed".*RemoteAddress=".+?/.+?/<HOST>/.+?".*
            SECURITY.* SecurityEvent="InvalidPassword".*RemoteAddress=".+?/.+?/<HOST>/.+?".*
сервис_fail2ban.txt · Последние изменения: 2020/09/16 13:07 — val