Centos7的安全防范
1。历史命令
# 当前用户不记录历史命令
echo "HISTSIZE=0" >> ~/.bash_profile
# 情况记录的历史命令
> ~/.bash_history
# 推出重新打开测试
2。防火墙关闭
systemctl stop firewalld.service#停止防火墙
systemctl disable firewalld.service#禁止firewall开机启动
3.sudo 免密码
echo 'password'|passwd --stdin root
useradd username
echo 'password'|passwd --stdin username
\cp /etc/sudoers /etc/sudoers.ori-$(date +%m%d)
echo 'username ALL=(ALL) NOPASSWD: ALL,!/usr/bin/passwd,/usr/bin/passwd[a-zA-Z]*,!/usr/bin/passwd root' >>/etc/sudoers
tail -1 /etc/sudoers
visudo -c
mv /usr/bin/sudo /usr/bin/bcbsudo
sed -i 's#4096#40960#g' /etc/security/limits.d/20-nproc.conf
sed -i "s#\#PermitRootLogin\ yes#PermitRootLogin\ no#g" /etc/ssh/sshd_config
systemctl restart sshd.service