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сервис_fail2ban [2020/06/25 16:36] val [Интеграция fail2ban и snort] |
сервис_fail2ban [2024/05/11 10:54] val [Интеграция fail2ban и snort] |
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| * [[https://thefragens.com/2010/11/checking-fail2ban-regex/|Checking Fail2ban regex]] | * [[https://thefragens.com/2010/11/checking-fail2ban-regex/|Checking Fail2ban regex]] | ||
| + | * [[https://forum.yunohost.org/t/fail2ban-high-cpu-usage/2439|Fail2ban high CPU usage]] | ||
| ===== Установка ===== | ===== Установка ===== | ||
| * [[https://help.ubuntu.com/community/Fail2ban|Fail2ban]] | * [[https://help.ubuntu.com/community/Fail2ban|Fail2ban]] | ||
| + | * [[https://bugs.launchpad.net/ubuntu/+source/fail2ban/+bug/2055114|fail2ban is broken in 24.04 Noble]] | ||
| <code> | <code> | ||
| + | debian11# apt install iptables | ||
| + | debian12# apt install iptables rsyslog | ||
| + | |||
| # apt install fail2ban | # apt install fail2ban | ||
| - | # cd /etc/fail2ban/ | + | ubuntu24# wget https://launchpad.net/ubuntu/+source/fail2ban/1.1.0-1/+build/28291332/+files/fail2ban_1.1.0-1_all.deb |
| + | ubuntu24# dpkg -i fail2ban_1.1.0-1_all.deb | ||
| </code> | </code> | ||
| Line 15: | Line 21: | ||
| <code> | <code> | ||
| - | # cat jail.conf | + | # cat /etc/fail2ban/jail.conf |
| + | |||
| + | # ls /etc/fail2ban/jail.d/ | ||
| - | # ls jail.d/ | + | # cat /etc/fail2ban/jail.d/defaults-debian.conf |
| - | # cat filter.d/sshd.conf | + | # cat /etc/fail2ban/filter.d/sshd.conf |
| - | # cat filter.d/asterisk.conf | + | # cat /etc/fail2ban/filter.d/asterisk.conf |
| </code><code> | </code><code> | ||
| - | # cat jail.local | + | # cat /etc/fail2ban/jail.local |
| </code><code> | </code><code> | ||
| [sshd] | [sshd] | ||
| maxretry = 6 | maxretry = 6 | ||
| + | #ignoreip = 192.168.X.0/24 192.168.100+X.0/24 | ||
| [asterisk] | [asterisk] | ||
| enabled = true | enabled = true | ||
| - | maxretry = 3 | + | maxretry = 3 |
| + | #bantime = 30d | ||
| + | #action = iptables-allports[blocktype=DROP] | ||
| + | #action = route[blocktype=blackhole] | ||
| </code> | </code> | ||
| Line 53: | Line 65: | ||
| ===== Интеграция fail2ban и cisco log ===== | ===== Интеграция fail2ban и cisco log ===== | ||
| + | |||
| + | * Резервное копирование конфигурации | ||
| + | |||
| <code> | <code> | ||
| # cat /etc/fail2ban/jail.d/cisco-change-config.conf | # cat /etc/fail2ban/jail.d/cisco-change-config.conf | ||
| Line 66: | Line 81: | ||
| # cat /etc/fail2ban/filter.d/cisco-change-config.conf | # cat /etc/fail2ban/filter.d/cisco-change-config.conf | ||
| </code><code> | </code><code> | ||
| - | [INCLUDES] | ||
| - | |||
| [Definition] | [Definition] | ||
| Line 79: | Line 92: | ||
| cd /srv/tftp/ | cd /srv/tftp/ | ||
| /usr/bin/git add * | /usr/bin/git add * | ||
| - | /usr/bin/git status | grep 'modified\|deleted\|new file' | /usr/bin/git commit -a -F - | + | /usr/bin/git --no-optional-locks status | grep 'modified\|deleted\|new file' | /usr/bin/git commit -a -F - |
| </code> | </code> | ||
| ===== Интеграция fail2ban и snort ===== | ===== Интеграция fail2ban и snort ===== | ||
| Line 92: | Line 105: | ||
| bantime = 300 | bantime = 300 | ||
| filter = snort_filter | filter = snort_filter | ||
| - | maxretry = 1 | + | maxretry = 3 |
| logpath = /var/log/auth.log | logpath = /var/log/auth.log | ||
| + | #action = mail-admin | ||
| #action = iptables-allports | #action = iptables-allports | ||
| + | #action = iptables-allports-forward | ||
| #action = cisco-acl | #action = cisco-acl | ||
| </code><code> | </code><code> | ||
| # cat /etc/fail2ban/filter.d/snort_filter.conf | # cat /etc/fail2ban/filter.d/snort_filter.conf | ||
| </code><code> | </code><code> | ||
| - | [INCLUDES] | ||
| - | |||
| [Definition] | [Definition] | ||
| Line 106: | Line 119: | ||
| # .*snort.*Priority: 2.*} <HOST>.* | # .*snort.*Priority: 2.*} <HOST>.* | ||
| - | ignoreregex = | + | #failregex = .*Original Client IP: <HOST>.* |
| </code> | </code> | ||
| + | |||
| + | ==== Уведомление по email ==== | ||
| + | <code> | ||
| + | # cat /etc/fail2ban/action.d/mail-admin.conf | ||
| + | </code><code> | ||
| + | [Definition] | ||
| + | |||
| + | actionban = printf %%b "Hi,\n | ||
| + | Ban this <ip> | ||
| + | Regards,\n | ||
| + | Fail2Ban"|mail -s "[Fail2Ban] Ban <name> <ip>" <dest> | ||
| + | |||
| + | actionunban = printf %%b "Hi,\n | ||
| + | Unban this <ip> | ||
| + | Regards,\n | ||
| + | Fail2Ban"|mail -s "[Fail2Ban] Unban <name> <ip>" <dest> | ||
| + | |||
| + | [Init] | ||
| + | |||
| + | name = mail-admin | ||
| + | |||
| + | dest = student | ||
| + | </code> | ||
| + | |||
| + | * [[#Запуск и отладка]] | ||
| ==== Блокировка через iptables ==== | ==== Блокировка через iptables ==== | ||
| <code> | <code> | ||
| - | # iptables -A FORWARD -j f2b-default | + | # 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 | ||
| + | </code><code> | ||
| + | ... | ||
| + | before = iptables-common-forward.conf | ||
| + | ... | ||
| + | </code><code> | ||
| + | # 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 | ||
| + | </code><code> | ||
| + | ... | ||
| + | chain = FORWARD | ||
| + | ... | ||
| </code> | </code> | ||
| + | * [[#Запуск и отладка]] | ||
| ==== Блокировка через cisco acl ==== | ==== Блокировка через cisco acl ==== | ||
| <code> | <code> | ||
| + | server# rsh router show access-lists | ||
| + | </code><code> | ||
| # cat /root/cisco-acl-deny.sh | # cat /root/cisco-acl-deny.sh | ||
| </code><code> | </code><code> | ||
| Line 137: | Line 192: | ||
| permit udp any any | permit udp any any | ||
| permit tcp any any established | permit tcp any any established | ||
| - | deny ip any any log | + | deny ip any any ! log |
| end | end | ||
| </code><code> | </code><code> | ||
| Line 162: | Line 217: | ||
| actionunban = /root/cisco-change-firewall.sh | actionunban = /root/cisco-change-firewall.sh | ||
| + | # if atack from DNS) | ||
| + | #actionunban = echo /root/cisco-change-firewall.sh | at now + 1 min | ||
| </code> | </code> | ||
| + | * [[#Запуск и отладка]] | ||
| ===== Отладка собственных фильтров ===== | ===== Отладка собственных фильтров ===== | ||
сервис_fail2ban.txt · Last modified: 2024/05/11 15:47 by val
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