How to set up a CentOS system to prevent the download and execution of malicious code?
The downloading and execution of malicious code is a very important issue in network security. To protect your CentOS system from such attacks, there are some measures you can take. This article will introduce you to some basic security settings and configurations, as well as some commonly used protection technologies and tools.
yum update
# 安装firewalld yum install firewalld # 启用firewalld systemctl start firewalld # 设置firewalld开机启动 systemctl enable firewalld # 开启常用的网络服务 firewall-cmd --permanent --add-service=http firewall-cmd --permanent --add-service=https # 重启防火墙 firewall-cmd --reload
The above code will enable firewalld and open HTTP and HTTPS services.
# 禁用和停止Telnet服务 systemctl disable telnet systemctl stop telnet # 禁用和停止FTP服务 systemctl disable vsftpd systemctl stop vsftpd # 禁用和停止无线服务 systemctl disable NetworkManager systemctl stop NetworkManager # 禁用和停止不必要的数据库服务(例如MySQL) systemctl disable mysqld systemctl stop mysqld
Other unnecessary services can be disabled and stopped according to actual needs.
# 修改/etc/hosts.allow文件以允许特定的主机访问 echo "sshd: 192.168.1.0/255.255.255.0" >> /etc/hosts.allow # 修改/etc/hosts.deny文件以阻止特定的主机访问 echo "sshd: ALL" >> /etc/hosts.deny
The above code will allow only hosts with IP address 192.168.1.0/24 to access the sshd service and block access to all other hosts.
# 安装yum-cron yum install yum-cron # 启用yum-cron systemctl start yum-cron # 设置yum-cron开机启动 systemctl enable yum-cron
The above code will install yum-cron and configure it to check and update packages regularly.
Summary:
It is crucial to prevent the download and execution of malicious code in CentOS systems. System security can be greatly improved by promptly updating the operating system and software packages, installing and configuring firewalls, disabling unnecessary services, and using access control and secure source control. The above are some basic security settings and configuration examples, I hope they will be helpful to you. However, please note that network security is an ever-evolving field that requires continuous learning and staying up to date with the latest security technologies and tools to protect systems from malicious code.
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