Fail2ban
Fail2ban is a software application that monitors log files for failed login attempts and other malicious activity.
When it detects suspicious activity, it takes action by banning the IP address of the attacker.
- Fail2ban monitors your log files for suspicious activity, such as failed login attempts or repeated requests for non-existent pages. When it detects such activity, it automatically bans the IP address of the offender using iptables.
- OpenSSH is configured to use fail2ban as its authentication method. This means that any failed login attempts to your server will be monitored by fail2ban and banned automatically if brutforce attack is detected.
fail2ban greatly reduces the risk of unauthorized access to your server. Fail2ban and iptables work together to monitor and block brutforce activity, while OpenSSH provides a secure way to access your server remotely.
Overall, the combination of (fail2ban+OpenSSH+Iptables) with predefined honeypot ssh blacklisted IP lists is a highly effective way to increase the security of your server.
Ideally this should be running in a SSH Proxy, never have a server listening wide open.
Fail2ban Settings
- bantime: This option sets the time in seconds for which an IP address is banned after exceeding the maximum number of allowed login attempts.
- maxretry: This option sets the maximum number of attempts login attempts before an IP address is banned.
- ignoreip: This option is used to specify the IP addresses that should be ignored by fail2ban.
- action: This option specifies the action to be taken when an IP address is banned.
- enabled: This option enables or disables the SSH jail.
- port: This option sets the port for the sshd service.
- bantime: This option sets the time in seconds for which an IP address is banned after exceeding the maximum number of allowed login attempts.
- ignoreip: This option specifies the IP addresses that should be ignored by fail2ban.
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