How to configure your CentOS system to prevent social engineering attacks

How to configure the CentOS system to prevent the intrusion of social engineering attacks

In today's digital era, social engineering attacks are a common intrusion method. Hackers trick people into leaking sensitive information by pretending to be trusted entities. thereby obtaining illegal benefits. In order to protect personal privacy and network security, we need to perform some configurations on the CentOS system to resist social engineering attacks. This article will introduce some effective configuration methods, as well as corresponding code examples.

1. Disable automatic login
   When the CentOS system starts, disabling the automatic login function can prevent unauthorized access. Edit the /etc/gdm/custom.conf file and find the following line:

   AutomaticLoginEnable=true
   AutomaticLogin=<username>

   Change these two lines to:

   AutomaticLoginEnable=false

2. Set strong Password Policy
   Using strong passwords prevents social engineering attackers from breaking in by guessing passwords. Modify the /etc/pam.d/system-auth file and find the following line:

   password    requisite     pam_cracklib.so try_first_pass retry=3 type=

   Replace it with:

   password    required     pam_cracklib.so retry=3 minlen=<min_length> difok=<min_different_characters>

   where, 3fca5af552595918c367ed6cd078a9c4 is the number of different characters that must be included in the password.

3. Install the firewall and configure the rules
   The firewall tool that comes with CentOS is iptables. Install the firewall using the following command:

   sudo yum install -y iptables-services

   Next, configure the firewall rules to allow necessary inbound and outbound connections and deny unnecessary connections. The following are some sample commands:

   # 清空当前防火墙规则
   sudo iptables -F
   
   # 允许 ssh 连接
   sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT
   
   # 允许 HTTP 和 HTTPS 连接
   sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT
   sudo iptables -A INPUT -p tcp --dport 443 -j ACCEPT
   
   # 拒绝其它入站连接
   sudo iptables -A INPUT -j REJECT
   
   # 允许所有出站连接
   sudo iptables -A OUTPUT -j ACCEPT

4. Configuring email alerts
   By setting up the email alert mechanism, we can receive security notifications from the system in time so that we can take timely action. The following is an example email alert configuration:

   # 安装邮件发送工具
   sudo yum install -y mailx
   
   # 编辑配置文件
   sudo vi /etc/aliases
   
   # 将以下行添加到配置文件中，将邮件发送到您的邮箱
   root:    your-email@example.com
   
   # 更新配置文件
   sudo newaliases
   
   # 测试邮件发送
   echo "Test email content" | mail -s "Test email subject" your-email@example.com

5. Update system and software regularly
   Updating system and software regularly ensures that your CentOS system has the latest security patches and feature improvements. Use the following command to update the system:

   sudo yum update -y

Through the above configuration, you can enhance security on the CentOS system, protect your personal privacy and network security, and prevent the intrusion of social engineering attacks. Remember, vigilance and timely updates are key to keeping your system secure.

Please note that the configuration methods and code examples provided in this article are for reference only. Specific configurations and commands may vary depending on system versions, environment variables and other factors. When configuring the system, please read the relevant documents carefully and make adjustments according to actual needs.

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