centos安装denyhosts

最近不知道得罪了哪路大神,一直都有坏人暴力破解本站的SSH登录密码。想安安静静的写博客就这么难么…没办法,那就安个denyhosts吧。

centos下直接使用Yum安装即可:yum install denyhosts.noarch

当然也可以下载编译安装。安装好后,配置文件是/etc/denyhosts.conf,参数说明如下:

SECURE_LOG = /var/log/secure#ssh日志文件

HOSTS_DENY = /etc/hosts.deny #将阻止IP写入到hosts.deny

PURGE_DENY =30m#过多久后清除已阻止IP

BLOCK_SERVICE  = sshd#阻止服务名

DENY_THRESHOLD_INVALID = 5//允许无效用户(在/etc/passwd未列出)登录失败次数,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 = 1//允许root登录失败的次数

DENY_THRESHOLD_RESTRICTED = 1#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 #将DenyHOts启动的pid纪录到LOCK_FILE中,已确保服务正确启动,防止同时启动多个服务。

ADMIN_EMAIL = a@b.com  #设置管理员邮件地址

SMTP_HOST = localhost

SMTP_PORT = 25

SMTP_FROM = DenyHosts nobody@localhost

SMTP_SUBJECT = DenyHosts Report

AGE_RESET_VALID=5d

AGE_RESET_ROOT=25d

AGE_RESET_RESTRICTED=25d

AGE_RESET_INVALID=10d

DAEMON_LOG = /var/log/denyhosts#自己的日志文件

DAEMON_SLEEP = 30s

DAEMON_PURGE = 1h#该项与PURGE_DENY 设置成一样,也是清除hosts.deniedssh 用户的时间

配置完成后,启动服务并设置开机启动:

service denyhosts start
chkconfig denyhosts on

然后查看 /etc/hosts.deny 文件,发现里面已经有记录了:

[root@miss_yi ~]# tail /etc/hosts.deny
# DenyHosts: Mon Oct 20 17:19:38 2014 | ALL: 74.221.172.28
ALL: 74.221.172.28
# DenyHosts: Mon Oct 20 17:19:38 2014 | ALL: 117.21.173.175
ALL: 117.21.173.175
# DenyHosts: Mon Oct 20 17:19:38 2014 | ALL: 112.78.3.196
ALL: 112.78.3.196
# DenyHosts: Mon Oct 20 17:19:38 2014 | ALL: 181.143.230.74
ALL: 181.143.230.74
# DenyHosts: Mon Oct 20 17:19:38 2014 | ALL: 216.151.221.194
ALL: 216.151.221.194
[root@miss_yi ~]# wc /etc/hosts.deny
  771  4628 30294 /etc/hosts.deny