Detailed explanation of Ubuntu server SSH security hardening strategy development process and reminders

php editor Banana specially introduced the process of formulating the Ubuntu server SSH security hardening strategy in detail, and provided some reminders. In an era where network security is becoming increasingly important, protecting the security of your servers is crucial. SSH is a commonly used remote login protocol, but it also faces some security risks. By understanding the process of formulating security hardening strategies and following precautions, we can help us improve the security of our servers and avoid being attacked by hackers. In this article, we will start with the preparation work, introduce the process of formulating the SSH security hardening strategy step by step, and remind everyone of the things you need to pay attention to.

Before formulating an SSH security hardening strategy, you first need to understand the working principle of SSH. SSH uses encryption and authentication technology to achieve secure remote access. Understand the working principle of SSH. , helpful for subsequent strategy formulation and configuration.

Different servers have different security requirements. Therefore, before formulating an SSH security hardening strategy, it is necessary to analyze the security requirements of the server, whether it is necessary to restrict remote access IPs, whether it is necessary to use key authentication, etc.

According to the security requirements of the server, formulate specific SSH security policies, restrict remote access IP range, disable root user login, enable two-step verification, etc.

Configure the SSH server accordingly according to the established security policy, which can be achieved by editing the SSH configuration file (/etc/ssh/sshd_config) and modifying parameters such as PermitRootLogin, PasswordAuthentication, etc.

After completing the configuration of the SSH server, testing and verification are required. You can log in to the server remotely to check whether it takes effect according to the policy and whether there are security vulnerabilities.

Regularly update the system and SSH software to repair known security vulnerabilities in a timely manner and improve the security of the server.

When logging in through SSH, using a complex password can effectively prevent brute force cracking. The password should contain uppercase and lowercase letters, numbers, and special characters, and be no less than 8 characters in length.

Disabling unnecessary SSH services can reduce the risk of the server being exposed to the external network. Only opening necessary ports and services can effectively reduce the attack surface.

Enabling login auditing can record information related to each SSH login, including login time, logged in user, etc. When a security event occurs, it can be traced and analyzed through the audit log.

Regularly back up important data to quickly restore data in the event of a security incident. Backup data should be stored in a safe and reliable place to avoid data leakage.

In SSH security hardening, disabling root user login is a very important strategy. By disabling root user login, you can prevent attackers from directly using root privileges to perform malicious operations. In order to facilitate management, you can create an ordinary The user is given sudo permissions to manage the server, which not only improves the security of the server but also facilitates management. Security is an ongoing task that requires constant monitoring and updates.

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