最近几天发现wordpress网站服务器的老被SSH暴利破解，因为开启了注册功能，被黑客注册了帐号，然后就看到用此帐号发帖子，内容都是一些linux命令，好像在获取我的password文件和root权限，并不断用SSH尝试登陆我的服务器。
鉴于这种安全隐患的存在，我们可以安装fail2ban工具来实现防暴力破解，防止恶意攻击，锁定恶意攻击IP。
1、如果是centos系统，先yum安装fail2ban
[root@VM_152_184_centos /]# yum -y install fail2ban
2、为了更好的看到有哪些IP在尝试暴利破解，先定义好日志文件路径
[root@VM_152_184_centos /]# cat /etc/fail2ban/fail2ban.conf |grep -v ^# [Definition] loglevel = 3 logtarget = SYSLOG //这里是日志路径，可以自定义，比如：/var/log/fail2ban.log socket = /var/run/fail2ban/fail2ban.sock pidfile = /var/run/fail2ban/fail2ban.pid
3、自定义主配置文件（当然，也可以不修改，保持默认配置）
[root@VM_152_184_centos /]# cat /etc/fail2ban/jail.conf |grep -v ^# |less [DEFAULT] ignoreip = 127.0.0.1/8 bantime = 600 //屏蔽、锁定时间，单位：s findtime = 600 //600s内尝试登陆失败超过规定次数将被锁定 maxretry = 3 //最大登陆失败次数 backend = auto usedns = warn
4、最后，启动fail2ban，使其配置生效
[root@VM_152_184_centos /]# service fail2ban start
最后，再查看一下fail2ban日志文件，可以看到已经屏蔽的IP列表（Ban ip是屏蔽/锁定的IP，Unban ip是自动解锁的IP）
[root@VM_152_184_centos /]# cat /var/log/fail2ban.log | grep "ban" 2014-04-15 21:12:18,053 fail2ban.actions: WARNING [ssh-iptables] Ban 198.104.137.151 2014-04-15 21:42:19,037 fail2ban.actions: WARNING [ssh-iptables] Unban 198.104.137.151 2014-04-15 22:12:16,001 fail2ban.actions: WARNING [ssh-iptables] Ban 116.10.191.218 2014-04-15 22:42:16,305 fail2ban.actions: WARNING [ssh-iptables] Unban 116.10.191.218 2014-04-15 23:02:02,609 fail2ban.actions: WARNING [ssh-iptables] Ban 117.34.91.170 2014-04-15 23:26:10,651 fail2ban.actions: WARNING [ssh-iptables] Ban 116.10.191.172 2014-04-15 23:28:02,391 fail2ban.actions: WARNING [ssh-iptables] Ban 198.104.137.151 2014-04-15 23:32:03,428 fail2ban.actions: WARNING [ssh-iptables] Unban 117.34.91.170 2014-04-15 23:46:07,364 fail2ban.actions: WARNING [ssh-iptables] Ban 116.10.191.205 2014-04-15 23:56:10,893 fail2ban.actions: WARNING [ssh-iptables] Unban 116.10.191.172
原文链接：用fail2ban阻止ssh暴力破解root密码，转载请注明来源！