Fail2ban

Instalando Apache e Fail2Ban

apt-get install fail2ban apache2

ajustes básico

cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
sed -i '30s/600/3600/g' /etc/fail2ban/jail.local
sed -i '34s/600/3600/g' /etc/fail2ban/jail.local
sed -i '35s/3/6/g' /etc/fail2ban/jail.local
sed -i '111s/action_/action_mwl/g' /etc/fail2ban/jail.local

proteção contra ataque no phpmyadmin

Acrescentar em /etc/fail2ban/jail.local

[phpmyadmin]
enabled = true
filter   = phpmyadmin
port = http,https
logpath = /var/log/apache2/access.log
action = iptables-multiport[name=phpmyadmin, port="http,https", protocol=tcp]
maxretry = 2
bantime = 84600

criar um arquivo em /etc/fail2ban/filter.d/phpmyadmin.conf com conteúdo:

[Definition]
failregex = \[client <HOST>\] File does not exist:.*(?i)phpmyadmin.*
            \[client <HOST>\] File does not exist:.*(?i)manager.*
            \[client <HOST>\] File does not exist:.*(?i)setup.*
            \[client <HOST>\] File does not exist:.*(?i)mysql.*
            \[client <HOST>\] File does not exist:.*(?i)sqlweb.*
            \[client <HOST>\] File does not exist:.*(?i)webdb.*
            \[client <HOST>\] File does not exist:.*(?i)pma.*
            \[client <HOST>\] File does not exist:.*(?i)vtigercrm.*
            ^<HOST>.*GET.*(?i)phpmyadmin.*
            ^<HOST>.*GET.*(?i)manager.*
            ^<HOST>.*GET.*(?i)setup.*
            ^<HOST>.*GET.*(?i)mysql.*
            ^<HOST>.*GET.*(?i)sqlweb.*
            ^<HOST>.*GET.*(?i)webdb.*
            ^<HOST>.*GET.*(?i)pma.*
            ^<HOST>.*GET.*(?i)vtigercrm.*
           
ignoreregex =

--- Reiniciar o fail2ban service fail2ban restart

--- Aplicar regras para ações já realizadas fail2ban-regex /var/log/apache2/access.log /etc/fail2ban/filter.d/apache-myadmin.conf

--- desbloqueando IP fail2ban-client set apache-myadmin unbanip 192.168.100.9

--- lista os filtros fail2ban-client status

--- lista o status do filtro fail2ban-client status apache-myadmin

• • • • • • • • • • • • • • • • • • • • • • • proteção contra ataque ao wordpress

acrescentar em /etc/fail2ban/jail.local

[wordpress] enabled = true filter = wordpress port = http,https action = iptables-multiport[name=wordpress, port="http,https", protocol=tcp] logpath = /var/log/apache2/access.log bantime = 84600 maxretry = 6

e crie o /etc/fail2ban/filter.d/wordpress.conf com o conteúdo

[Definition] failregex = ^<HOST> .* "POST .*xmlrpc\.php

           ^<HOST> .* "POST .*wp-cron\.php.*
           ^<HOST> .* "POST .*wp-login\.php

ignoreregex =

• • • • • • • • • • • • • • • • • • • • • • • proteção contra ataque sqlinject

[sqlinject] enabled = true filter = sqlinject port = http,https action = iptables-multiport[name=sqlinject, port="http,https", protocol=tcp] logpath = /var/log/apache2/access.log bantime = 84600 maxretry = 6

e crie o /etc/fail2ban/filter.d/sqlinject.conf com o conteúdo

1. Fail2Ban configuration file
3. Author: TrogloGeek (Damien VERON)
5. $Revision: 1 $

[Definition]

sqlfragments_generic = select.*from|delete.*from|update.*set|insert.*into|replace.*(value|set) sqlfragments_havij = and(\+|%%20)ascii%%28substring|and(\+|%%20)Length|union(\+|%%20)all(\+|%%20)select|and(\+|%%20)1%%3C1|and(\+|%%20)1%%3D1|and(\+|%%20)1%%3E1|and(\+|%%20)%%27.%%27%%3D%%27|%%2F\*%%21[0-9]+((\+|%%20)[0-9]*)?\*%%2F

1. Option: failregex
2. Notes.: Regex to try to detect SQL injection trials
3. Values: TEXT

failregex = ^<HOST> -[^"]*"[A-Z]+\s+/[^"]*\?[^"]*(?:%(sqlfragments_generic)s|%(sqlfragments_havij)s)[^"]*HTTP[^"]*"

1. Option: ignoreregex
2. Notes.: regex to ignore. If this regex matches, the line is ignored.
3. Values: TEXT

ignoreregex =

Referências https://www.fail2ban.org/wiki/index.php/HOWTO_apache_myadmin_filter https://www.digitalocean.com/community/tutorials/how-to-protect-an-apache-server-with-fail2ban-on-ubuntu-14-04 https://github.com/TrogloGeek/fail2ban-apache-sqlinject

• http://ittipsoftheday.blogspot.com.br/2016/01/how-to-remove-ip-from-iredmail.html
• http://www.the-art-of-web.com/system/fail2ban-log/
• https://github.com/fail2ban/fail2ban/issues/132
• https://www.raspberrypi.org/forums/viewtopic.php?t=67934&p=496490
• http://serverfault.com/questions/285256/how-to-unban-an-ip-properly-with-fail2ban

iptables -D fail2ban-NAME -s IP -j DROP