Summary of "ЗАЩИТИ SSH-СЕРВЕР! НАСТРОЙ БЕЗОПАСНОСТЬ ЗА 10 МИНУТ!"

Securing an SSH Server: A Practical 10-Minute Tutorial

This tutorial video provides a beginner-friendly, practical guide to securing an SSH server quickly and effectively. It is ideal for those managing personal or cloud servers and covers essential security practices and configurations to protect SSH access.

Key Technological Concepts and Product Features Covered

1. Server Setup

Demonstrates creating an Ubuntu 22 server on a cloud provider (Linode is used as an example, but any provider works).
Shows how to log into the server via SSH using root credentials.

2. SSH Key Authentication

Explains why password-based SSH login is insecure (risks include keyloggers and forgotten passwords).
Guides through generating RSA SSH key pairs with 4096-bit encryption for stronger security.
Shows how to copy the public key to the server’s authorized_keys file for passwordless login.
Emphasizes setting a passphrase on the private key for additional protection.

3. Firewall Configuration (UFW)

Introduces UFW (Uncomplicated Firewall) to restrict SSH access by IP address.
Demonstrates allowing only specific IP addresses to connect on port 22 (the default SSH port).
Shows enabling and managing UFW rules to block unauthorized IPs.

4. Fail2Ban Installation and Configuration

Installs Fail2Ban to prevent brute-force attacks by banning IPs after multiple failed login attempts.
Creates a local jail configuration file for SSH with parameters like max retries and ban time.
Demonstrates how Fail2Ban blocks repeated failed attempts and how to unblock IPs via the cloud provider’s browser console.

5. Disabling Password Authentication

Shows editing the SSH daemon configuration (sshd_config) to disable password authentication entirely, forcing the use of SSH keys only.
Explains restarting the SSH service after changes.

6. Optional SSH Port Change

Briefly mentions changing the default SSH port from 22 to another port to reduce automated attacks.
Notes that this is not a strong security measure but can reduce noise from automated scans.

Summary of Tutorial Steps

Create or use an existing Ubuntu server (cloud or local).
Update and patch the server.
Generate an RSA SSH key pair with a strong passphrase.
Copy the public key to the server’s authorized_keys.
Configure UFW to restrict SSH access by IP address.
Install and configure Fail2Ban to block repeated failed login attempts.
Learn how to unblock IPs using Fail2Ban client commands via the cloud console.
Disable password authentication in SSH config for enhanced security.
Optionally change the SSH port to a non-standard port.

Additional Notes

The video promotes a Fire Safety Engineer course tailored for IT security professionals, emphasizing the importance and demand for security expertise.

Main Speaker

The tutorial is presented by an unnamed instructor who shares personal experience and uses step-by-step commands to explain securing an SSH server.
The speaker adopts a casual, educational style and references personal preferences, such as using Linode as the cloud provider and Ubuntu 22 as the server OS.

In essence, this video is a beginner-friendly guide to quickly hardening SSH servers using key-based authentication, firewall rules, Fail2Ban, and SSH configuration tweaks to prevent unauthorized access and brute-force attacks.