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{{DISPLAYTITLE:Fail2ban}}<languages/> Fail2ban helps you to protect yourself from [http://en.wikipedia.org/wiki/Brute-force_attack brute force] attacks coming from a single IP-address by monitoring the log files on your server. Fail2ban can be used - for example - to prevent logging in after a set amount of failed login attempts. You can get different kinds of filters for Fail2ban which work for instance with [[Apache2|Apache]], [[Dovecot]], [[Postfix]] and [[Ssh|SSH]]. The problem with Fail2ban is that it does not support IPv6 addresses and does not protect well against distributed [http://en.wikipedia.org/wiki/Brute-force_attack brute force] attacks. == Installation == === Debian / Ubuntu === [[aptitude]] install fail2ban OR [[apt-get]] install fail2ban === Red Hat / CentOS / Fedora === Download installation package rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm Install with the command yum install fail2ban == Configuration == Open /etc/fail2ban/jail.conf [[nano]] /etc/fail2ban/jail.conf Default settings: '''ignoreip''' = IP-addresses which bypass the filters '''bantime''' = Determines how long an address is kept on the ban list, default is 600 seconds '''findtime''' = Blocks an IP-address if it has failed to login three times consecutively within the set time, '''findtime''' '''maxretry''' = How many attempts an address is allowed until it is blocked Example configuration: [DEFAULT] # "ignoreip" can be an IP address, a CIDR mask or a DNS host ignoreip = 127.0.0.1 192.168.1.1 bantime = 600 maxretry = 3 # "backend" specifies the backend used to get files modification. Available # options are "gamin", "polling" and "auto This configuration excludes the IP-addresses 192.168.1.1 and 172.0.0.1 (=localhost) from the ban list. Maximum 3 login attempts allowed until address is placed on a 600 second ban list. And the SSH configuration: [ssh] # fail2ban-ssh = filter name enabled = true # is filter in use? options are true and false port = ssh # port which can be used for ssh for example port 22 filter = sshd # type of filter. filters can be found from the /etc/fail2ban/filter.d/ directory logpath = /var/log/auth.log # location of logs maxretry = 6 # how many attempts are allowed Example configurations: === Apache === [apache] enabled = true port = http,https filter = apache-auth logpath = /var/log/apache*/*error.log maxretry = 6 # default action is now multiport, so apache-multiport jail was left # for compatibility with previous (<0.7.6-2) releases [apache-multiport] enabled = true port = http,https filter = apache-auth logpath = /var/log/apache*/*error.log maxretry = 6 [apache-noscript] enabled = true port = http,https filter = apache-noscript logpath = /var/log/apache*/*error.log maxretry = 6 [apache-overflows] enabled = true port = http,https filter = apache-overflows logpath = /var/log/apache*/*error.log maxretry = 2 === SSH === [ssh] enabled = true port = ssh filter = sshd logpath = /var/log/auth.log maxretry = 6 By default SSH allows 6 attempts when trying to form a connection, we recommend limiting it to 3 attempts. '''port = ssh''' must be changed if you have changed the SSH default port in the /etc/ssh/sshd.config file. === Proftpd === [proftpd] enabled = true port = ftp,ftp-data,ftps,ftps-data filter = proftpd logpath = /var/log/proftpd/proftpd.log maxretry = 3 === Postfix === [postfix] enabled = true port = smtp,ssmtp filter = postfix logpath = /var/log/mail.log [sasl] enabled = true port = smtp,ssmtp,imap2,imap3,imaps,pop3,pop3s filter = sasl # You might consider monitoring /var/log/mail.warn instead if you are # running postfix since it would provide the same log lines at the # "warn" level but overall at the smaller filesize. logpath = /var/log/mail.log [dovecot] enabled = true port = smtp,ssmtp,imap2,imap3,imaps,pop3,pop3s filter = dovecot logpath = /var/log/mail.log ==Log File== Fail2ban checks the ban list from the fail2ban log, which can be found under the path /var/log/fail2ban.log nano /var/log/fail2ban.log In this file you can see all the logs and attempts made trying to connect to your server. Example log: 2014-05-13 15:52:30,388 fail2ban.actions: WARNING [sendmail] Ban XXX.66.82.116 2014-05-13 15:59:29,295 fail2ban.actions: WARNING [sendmail] Ban XXX.27.118.100 2014-05-13 16:07:31,183 fail2ban.actions: WARNING [sendmail] Unban XXX.66.82.116 2014-05-13 16:14:29,530 fail2ban.actions: WARNING [sendmail] Unban XXX.27.118.100 2014-05-13 16:56:27,086 fail2ban.actions: WARNING [ssh] Ban XXX.136.60.164 2014-05-13 17:11:27,833 fail2ban.actions: WARNING [ssh] Unban XXX.136.60.164 == Related info == [[Iptables]] == Additional information == https://www.omaserveri.info/suojaa-ssh-yhteytesi-brute-force-hyokkayksilta/ (Finnish) == Sources == https://www.digitalocean.com/community/tutorials/how-to-protect-ssh-with-fail2ban-on-centos-6
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