Sudoers Security Audit: Finding NOPASSWD Entries and Privilege Escalation Risks
The sudoers file is the single most important text file on a Linux server. A misconfigured rule is the most common path ...
Security & Hardening
Linux security, firewall configuration, and system hardening guides
SSH Hardening: Securing Your Linux Server Against Brute Force and Unauthorized Access
SSH is the front door to every Linux server you operate. Get it right and the box can sit on the public internet for yea...
AppArmor Profile Security Check: Ubuntu/Debian Guide
Check AppArmor profiles, enforcement modes, and violations with dargslan-apparmor-check CLI tool....
File Integrity Monitoring on Linux: Hash-Based Change Detection Guide
File Integrity Monitoring (FIM) is a critical security control that detects unauthorized changes to system files, config...
Linux Login Tracking: SSH Session Monitoring and Brute Force Detection
Monitoring login activity is a fundamental security practice. Every SSH session, failed authentication attempt, and susp...
Environment Variable Security: Protecting Secrets in Linux and DevOps
Environment variables are the standard way to pass configuration and credentials to applications, but they introduce sec...
How to Monitor Linux RAID Arrays: Complete mdadm Health Check Guide
RAID (Redundant Array of Independent Disks) provides data redundancy and performance improvements for Linux servers. How...
Linux Sysctl Audit: Kernel Parameter Security Hardening and Network Tuning
A periodic sysctl audit catches the slow drift that turns a hardened server into an unhardened one. Over months, distrib...
Linux Audit Log Analysis: Tracking File Access, Commands, and Security Events
The Linux audit framework is the closest thing the kernel provides to a flight recorder. Every system call, every file a...