转自:http://blog.chinaunix.net/uid-26167002-id-3026491.html
denyhosts是python语言程序,借用tcp_wrapper程序来进行主机防护。作用:防止暴力破解服务器用户密码。
1.安装
# cd /usr/local
DenyHosts-2.6.tar.gz
# tar -zxvf DenyHosts-2.6.tar.gz
# cd DenyHosts-2.5
# python setup.py install
默认是安装到/usr/share/denyhosts目录
2.配置
# cd /usr/share/denyhosts/
# cp denyhosts.cfg-dist denyhosts.cfg
# vi denyhosts.cfg
相关参数解释:
############ THESE SETTINGS ARE REQUIRED ############
SECURE_LOG = /var/log/secure
HOSTS_DENY = /etc/hosts.deny
PURGE_DENY = 1w #过多久后清除已经禁止的,其中w代表周,d代表天,h代表小时,s代表秒,m代表分钟
BLOCK_SERVICE = sshd
DENY_THRESHOLD_INVALID = 3 #允许无效用户失败的次数
DENY_THRESHOLD_VALID = 5 #允许普通用户登陆失败的次数
DENY_THRESHOLD_ROOT = 5 #允许root登陆失败的次数
DENY_THRESHOLD_RESTRICTED = 1
WORK_DIR = /usr/share/denyhosts/data
SUSPICIOUS_LOGIN_REPORT_ALLOWED_HOSTS=YES
HOSTNAME_LOOKUP=YES
LOCK_FILE = /var/lock/subsys/denyhosts
############ THESE SETTINGS ARE OPTIONAL ############
ADMIN_EMAIL = [email protected] #若有ip被禁用发邮件通知
SMTP_HOST = localhost
SMTP_PORT = 25
SMTP_FROM = DenyHosts <192.168.0.1@localhost>
SMTP_SUBJECT = DenyHosts Report
AGE_RESET_VALID=1d #有效用户登录失败计数归零的时间
AGE_RESET_ROOT=1d #root用户登录失败计数归零的时间
AGE_RESET_RESTRICTED=1d
AGE_RESET_INVALID=10d #无效用户登录失败计数归零的时间
######### THESE SETTINGS ARE SPECIFIC TO DAEMON MODE ##########
DAEMON_LOG = /var/log/denyhosts
DAEMON_SLEEP = 30s
DAEMON_PURGE = 1h
登录[email protected]邮箱查看是否有IP被禁用。######################################################
设置启动脚本
# cp daemon-control-dist daemon-control
# chown root daemon-control
# chmod 700 daemon-control
#./daemon-control start (启动)
#ln -s /usr/share/denyhosts/daemon-control /etc/init.d/denyhosts
#chkconfig --add denyhosts
#chkconfig --list denyhosts
#chkconfig denyhosts on
设置开机启动
# vi /etc/rc.local
添加/usr/share/denyhosts/daemon-control start
3.启动服务
service denyhosts start
4. denyhos使用
如果不想让主机拒绝某一个ip,做法如下:
vi /etc/hosts.allow
sshd: 192.168.0.1 #允许192.168.0.1访问该主机的ssh服务
如果想拒绝某一个ip同样使用vi /etc/hosts.deny添加就Ok