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Lab 9.1 - Securing Permissions

Objectives​

  • Audit permissions
  • Correct dangerous permissions
  • Secure SSH and cron

Exercise 1: Audit​

# Find world-writable files
find /home -type f -perm -o+w

# Find world-writable directories
find /home -type d -perm -o+w

# SSH Permissions
ls -la ~/.ssh

Exercise 2: Correction​

# Correct SSH
chmod 700 ~/.ssh
chmod 600 ~/.ssh/id_rsa
chmod 644 ~/.ssh/id_rsa.pub

Lab created on: December 2024 - Tested on Ubuntu 24.04