DenyHosts是Python语言写的一个程序，它会分析sshd的日志文件（/var/log/secure），当发现重 复的攻击时就会记录IP到/etc/hosts.deny文件，从而达到自动屏IP的功能
DenyHosts官方网站 http://denyhosts.sourceforge.net
下载页面 http://sourceforge.net/projects/denyhosts/files/
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tar -xzf DenyHosts-2.6.tar.gz
cd DenyHosts-2.6
python setup.py install
cd /usr/share/denyhosts/ #安装目录
cp denyhosts.cfg-dist denyhosts.cfg
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vim denyhosts.cfg
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############ THESE SETTINGS ARE REQUIRED ############
SECURE_LOG = /var/log/secure #系统的ssh日志，centos默认是这个文件
HOSTS_DENY = /etc/hosts.deny #被阻止ip的文档
PURGE_DENY = 2d #阻止时间
BLOCK_SERVICE = sshdDENY_THRESHOLD_INVALID = 5 #允许无效用户登录失败的次数
DENY_THRESHOLD_VALID = 10 #允许普通用户登录失败的次数
DENY_THRESHOLD_ROOT = 3 #允许root登录失败的次数
DENY_THRESHOLD_RESTRICTED = 3 #设定 deny host 写入到该资料夹
WORK_DIR = /usr/share/denyhosts/data #将deny的host或ip纪录到Work_dir中
SUSPICIOUS_LOGIN_REPORT_ALLOWED_HOSTS=YES HOSTNAME_LOOKUP=YES #是否做域名反解
LOCK_FILE = /var/lock/subsys/denyhosts
############ THESE SETTINGS ARE OPTIONAL ############
ADMIN_EMAIL = your_mail@163.comSMTP_HOST = localhostSMTP_PORT = 25SMTP_FROM = DenyHosts <nobody@localhost>SMTP_SUBJECT = DenyHosts ReportAGE_RESET_VALID=5dAGE_RESET_ROOT=25dAGE_RESET_RESTRICTED=25dAGE_RESET_INVALID=10d ######### THESE SETTINGS ARE SPECIFIC TO DAEMON MODE ##########
DAEMON_LOG = /var/log/denyhosts #denyhosts自己的日志
DAEMON_SLEEP = 30sDAEMON_PURGE = 1h |
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cp daemon-control-dist daemon-control
chown root daemon-control
chmod 700 daemon-control
./daemon-control start
ln -s /usr/share/denyhosts/daemon-control /etc/init.d/denyhosts
chkconfig --level 2345 denyhosts on |
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#重启服务以及进程service denyhosts restart |
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sent DenyHosts SIGTERMstarting DenyHosts: /usr/bin/env python /usr/bin/denyhosts.py --daemon --config=/usr/share/denyhosts/denyhosts.cfg
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cat /etc/hosts.deny #查看阻止的ip 记录
如果取消这个ip的限制，则在/etc/hosts.deny 删除ip信息
本文转自 bbotte 51CTO博客，原文链接：http://blog.51cto.com/bbotte/1530831，如需转载请自行联系原作者