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howto:fail2ban [2017/09/19 12:11] – fixes more fixes ragnarokhowto:fail2ban [2025/08/18 14:15] (current) – Updated filter for hack.log, now matching all hack attempts, not just FTP Karloch
Line 26: Line 26:
 findtime = 21600 findtime = 21600
 bantime = 21600 bantime = 21600
 +
 +[sbbs-ddos]
 +enabled  = true
 +filter   = sbbs-ddos
 +action   = iptables-allports[name=SBBS-ddos, protocol=all]
 +logpath  = /var/log/sbbs.log
 +maxretry = 8
 +findtime = 600
 +bantime = 21600
 +
 +[sbbs-hack]
 +enabled  = true
 +filter   = sbbs-hack
 +action   = iptables-allports[name=SBBS-hack, protocol=all]
 +logpath  = /sbbs/data/hack.log
 +maxretry = 3
 +findtime = 21600
 +bantime = 21600
 +
 +[sbbs-smtp]
 +enabled  = true
 +filter   = sbbs-smtp
 +action   = iptables-allports[name=SBBS-smtp, protocol=all]
 +logpath  = /var/log/sbbs.log
 +maxretry = 3
 +findtime = 21600
 +bantime = 21600
 +
 +[sbbs-spam]
 +enabled  = true
 +filter   = sbbs-spam
 +action   = iptables-allports[name=SBBS-spam, protocol=all]
 +logpath  = /sbbs/data/spam.log
 +maxretry = 3
 +findtime = 21600
 +bantime = 21600
 +
 +
 </code> </code>
  
 Create the filter file /etc/fail2ban/filter.d/sbbs-main.conf Create the filter file /etc/fail2ban/filter.d/sbbs-main.conf
 <code> <code>
-[INCLUDES]                                                                                                                                                               +[INCLUDES] 
-before = common.conf                                                                                                                                                    +before = common.conf
  
-[Definition]                                                                                                                                                             +[Definition] 
-failregex = Bad password from: <HOST>                                                                                                                                    +failregex = Bad password from: <HOST> 
-            Throttling suspicious connection from: <HOST>                                                                                                                +            Throttling suspicious connection from: <HOST> 
-ignoreregex =  +ignoreregex = 
 +</code> 
 + 
 +Filter for ddos (/etc/fail2ban/filter.d/sbbs-ddos.conf) 
 +<code> 
 +[INCLUDES] 
 +before = common.conf 
 + 
 +[Definition] 
 +failregex = !Maximum concurrent connections without login (.*) reached from host: <HOST> 
 +ignoreregex = 
 +</code> 
 + 
 +Filter for hack.log (/etc/fail2ban/filter.d/sbbs-hack.conf) 
 +<code> 
 +[INCLUDES] 
 +before = common.conf 
 +[Init] 
 +maxlines = 3 
 +[Definition] 
 +failregex = ^SUSPECTED .* LOGIN HACK ATTEMPT .*$(?:\r?\n)+Using port \S+ at .* \[(?:::ffff:)?<HOST>\]\s*$ 
 +datepattern = {}(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun) %%b %%d %%Y %%H:%%M:%%S 
 +ignoreregex = 
 +</code> 
 + 
 +Filter for smtp (/etc/fail2ban/filter.d/sbbs-smtp.conf) 
 +<code> 
 +[INCLUDES] 
 +before = common.conf 
 +[Definition] 
 +failregex = .* !TEMPORARY BAN of .* <HOST> .* 
 +            SMTP BLACKLISTED SERVER on .* \(.*\)\: .* \[<HOST>\] 
 +            ^.*\[<HOST>\].*\!TEMPORARY BAN.*$ 
 +ignoreregex = 
 +</code> 
 + 
 +Filter for spam (/etc/fail2ban/filter.d/sbbs-spam.conf) 
 +<code> 
 +[INCLUDES] 
 +before = common.conf 
 +[Definition] 
 +failregex = SMTP BLACKLISTED SERVER on .* \(.*\)\: .* \[<HOST>\] 
 +            Host\: .* \[<HOST>\] 
 +ignoreregex =
 </code> </code>
  
 Reload or restart the service and verify if you jail is loaded: Reload or restart the service and verify if you jail is loaded:
 <code> <code>
 +
 # fail2ban-client status # fail2ban-client status
 Status Status
-|- Number of jail:      7 +|- Number of jail: 7 
-`- Jail list:           ssh, asterisk-udp, *sbbs-main*, nginx-http-auth, ssh-ddos, asterisk-tcp+`- Jail list: asterisk, nginx-botsearch, *sbbs-hack, *sbbs-main, *sbbs-smtp, *sbbs-spam, *sbbs-ddos, sshd
  
 </code> </code>
 +(*) your sbbs active jail's
  
 After some time, you can observe via iptables that severals ip address was blocked After some time, you can observe via iptables that severals ip address was blocked
Line 73: Line 156:
 RETURN     all  --  0.0.0.0/0            0.0.0.0/0            RETURN     all  --  0.0.0.0/0            0.0.0.0/0           
  
 +Chain fail2ban-SBBS-ddos (1 references)
 +target     prot opt source               destination
 +REJECT     all  --  110.53.221.190       0.0.0.0/0            reject-with icmp-port-unreachable
 +RETURN     all  --  0.0.0.0/0            0.0.0.0/0
 </code> </code>
- 
-**ToDo:** 
-  
-  * Add regexp for spam.log and hack.log  
-  
 ===== See Also ===== ===== See Also =====
   * [[:howto:|howto index]]   * [[:howto:|howto index]]
  
-{{tag>}}+{{tag>linux}}
  

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