How to perform system security hardening and protection on Kirin operating system?

How to perform system security reinforcement and protection on Kirin operating system?

With the development of technology and the popularity of the Internet, system security issues have become more and more important. Kirin operating system is an operating system independently developed by China and has the characteristics of independent controllability. System security reinforcement and protection on the Kirin operating system can effectively protect users' privacy and information security. This article will introduce some methods of system security hardening and protection on Kirin operating system, and provide corresponding code examples.

1. Update system patches

Timely updating of system patches is a basic step to maintain system security. Whether it is Windows, Linux or Kirin operating system, security patches will be released from time to time to fix system vulnerabilities. Therefore, it is very necessary to regularly check and update system patches.

In the Kirin operating system, you can update the system patch through the following command:

sudo apt update
sudo apt upgrade

2. Install the firewall

The firewall is the first line of defense for system security and can monitor and filter network traffic in and out of the system to prevent malicious attacks and illegal access. In Kirin operating system, you can use the iptables command to set up the firewall.

The following is a simple code example for setting firewall rules:

# 清空已有规则
sudo iptables -F
sudo iptables -X
sudo iptables -Z

# 允许相关连接
sudo iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

# 允许本地回环
sudo iptables -A INPUT -i lo -j ACCEPT
sudo iptables -A OUTPUT -o lo -j ACCEPT

# 允许常用服务
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT   # 允许SSH
sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT   # 允许HTTP
sudo iptables -A INPUT -p tcp --dport 443 -j ACCEPT  # 允许HTTPS

# 拒绝其它连接
sudo iptables -A INPUT -j DROP
sudo iptables -A OUTPUT -j DROP

The above code is set to allow established and related connections, local loopbacks, and commonly used SSH, HTTP, HTTPS service, while other connections were refused.

3. Strengthen user identity verification measures

User identity verification is an important means to prevent unauthorized access. In Kirin operating system, user authentication measures can be strengthened by modifying the /etc/login.defs file.

The following is a code example for modifying the password policy settings in the /etc/login.defs file:

# 更改密码有效期为90天
sudo sed -i 's/PASS_MAX_DAYS    99999/PASS_MAX_DAYS    90/g' /etc/login.defs

# 设置密码最短长度为8
sudo sed -i 's/PASS_MIN_LEN    5/PASS_MIN_LEN    8/g' /etc/login.defs

# 设置最大失败登录次数为5次
sudo sed -i 's/LOGIN_RETRIES    5/LOGIN_RETRIES    5/g' /etc/login.defs

The sed command in the above code is used to modify /etc/login.defs Relevant parameter values ​​in the file, thereby strengthening the restrictions on password validity period, minimum password length, and maximum number of failed logins.

4. Install anti-virus software and security tools

In order to protect the system from viruses and malware, installing anti-virus software and security tools is a necessary measure. In the Kirin operating system, you can choose to install excellent domestic and foreign anti-virus software and security tools, such as 360 Anti-Virus, Tencent Butler, etc.

5. Encrypt important data

For important data in the system, such as personal privacy, sensitive documents, etc., it is recommended to encrypt it. In Kirin operating system, you can use GPG tools for data encryption and decryption.

The following is a simple code example for using the GPG tool to encrypt documents:

# 生成密钥对
gpg --gen-key

# 加密文档
gpg -e -r recipient@example.com document.txt

# 解密文档
gpg -d document.txt.gpg > decrypted_document.txt

The gpg command is used in the above code to generate a key pair and used for encryption and Decrypt the document.

Through the above measures, we can perform system security reinforcement and protection on the Kirin operating system. Timely updating of system patches, installing firewalls, strengthening user authentication, installing anti-virus software and security tools, and encrypting important data can greatly improve system security. Of course, these are just some basic security measures. We also need to continuously improve and optimize the security reinforcement and protection measures of the system based on actual needs and conditions.

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