hardening

Name: hardening
Availability: InStock
Author: chaterm

Harden Linux systems via SSH, kernel, user, file, and service security.

50|13|Updated Jan 19, 2026

Search Tags:#security #linux #ssh #hardening #cis #sysctl

Ready to run

npx skills add https://github.com/chaterm/terminal-skills --skill hardening

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: hardening
Source: https://github.com/chaterm/terminal-skills/tree/main/security/hardening
Command: npx skills add https://github.com/chaterm/terminal-skills --skill hardening

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill addresses the critical need to enhance system security by implementing robust hardening techniques and baseline configurations, protecting against common vulnerabilities.

Core Features & Use Cases

SSH Hardening: Secure remote access by disabling root login, enforcing key-based authentication, and optimizing configurations.
Kernel Parameter Tuning: Apply security-focused sysctl settings to reduce attack surfaces.
User Account Security: Implement password policies and account lockout mechanisms.
File Permissions: Enforce strict permissions on critical system files and identify insecure file configurations.
Service Management: Disable unnecessary services and restrict cron job access.
Use Case: A system administrator needs to quickly apply security best practices to a newly provisioned Linux server to meet compliance requirements.

Quick Start

Apply the system hardening script to secure the server.

Frequently Asked Questions about hardening

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I apply Linux server hardening for baseline security and compliance?▼

Linux server hardening involves securing SSH configurations, applying sysctl kernel parameter tuning, enforcing user account security, managing file permissions, and disabling unnecessary services to reduce attack vectors and meet compliance baselines.

What is the best way to secure SSH configurations on a newly provisioned Linux server?▼

The best way to secure SSH configurations involves disabling root login, enforcing key-based authentication, and optimizing connection settings to protect remote access against unauthorized entry and common vulnerabilities.

How do I tune sysctl kernel parameters to reduce system attack surfaces?▼

You tune sysctl kernel parameters by applying security-focused settings that control network stack behaviors and memory management, directly reducing the Linux system's attack surface against network-based exploits.

Does this hardening approach support enforcing user account lockout and password policies?▼

Yes, this hardening approach supports user account security by implementing strict password policies and configuring account lockout mechanisms, ensuring baseline protection against brute force access attempts.

Can I restrict cron job access and disable unnecessary services during system hardening?▼

You can restrict cron job access and disable unnecessary services during system hardening to minimize active network listeners and prevent unauthorized scheduled task execution, directly reducing overall attack vectors.