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  • Fail2ban防止SSH暴力破解

    [root@kazihuo /srv]# wget https://github.com/fail2ban/fail2ban/archive/0.8.14.tar.gz

    [root@kazihuo /srv]# tar -axvf fail2ban-0.8.14.tar.gz

    # 环境要求python版本>=2.6

    [root@kazihuo /srv/fail2ban-0.8.14]# python setup.py install

    # Centos6环境操作:

    [root@kazihuo /srv/fail2ban-0.8.14/files]# cp -ap redhat-initd /etc/init.d/fail2ban

    # Centos7环境操作:

    [root@kazihuo /srv/fail2ban-0.8.14/files]# cp -ap fail2ban.service /usr/lib/systemd/system/

    # 主要相关文件说明

    [root@kazihuo ~]# ls /etc/fail2ban/

    action.d #动作文件夹,含默认文件iptablesmail等动作配置;

    fail2ban.conf #定义服务日志级别、位置及sock文件位置;

    filter.d #条件文件夹,过滤日志关键字内容设置;

    jail.conf #主要配置文件,设置ban做东的服务及动作阈值;

    # 对应修改配置文件内容

    [root@kazihuo ~]# cat /etc/fail2ban/jail.conf

    [ssh-iptables]

     

    bantime = 180 # 禁止时间

    findtime = 120 # 允许连接时输出密码次数的指定时间内

    enabled = true

    filter = sshd

    action = iptables[name=SSH, port=ssh, protocol=tcp]

    sendmail-whois[name=SSH, dest=you@example.com, sender=fail2ban@example.com, sendername="Fail2Ban"]

    logpath = /var/log/secure

    maxretry = 2

    [root@kazihuo ~]# systemctl start fail2ban.service

    # 当用另一台服务器2次连接错误测试时,本服务器自动屏蔽另一台服务器ip,180s后解锁,同时防火墙添加了对应规则:

    [root@kazihuo ~]# iptables -L -n

    Chain fail2ban-SSH (1 references)

    target prot opt source destination

    REJECT all -- 192.168.10.16 0.0.0.0/0 reject-with icmp-port-unreachable

    RETURN all -- 0.0.0.0/0 0.0.0.0/0

    # 查看信息

    [root@kazihuo ~]# fail2ban-client status

    Status

    |- Number of jail:    1

    `- Jail list:        ssh-iptables

    [root@kazihuo ~]# fail2ban-client status ssh-iptables

    Status for the jail: ssh-iptables

    |- filter

    | |- File list:    /var/log/secure

    | |- Currently failed:    0

    | `- Total failed:    4

    `- action

    |- Currently banned:    1

    | `- IP list:    192.168.10.16

    `- Total banned:    2

    # 当需要清空屏蔽的ip时,进行以下操作:

    [root@kazihuo ~]# > /var/log/secure

    [root@kazihuo ~]# systemctl restart fail2ban.service

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  • 原文地址:https://www.cnblogs.com/kazihuo/p/8627298.html
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