Linux for Ethical Hackers - Lecture Notes

Instructor Introduction

• Name: Heath Adams
• Position: CEO of TCM Security
• Experience: Ethical hacker, penetration testing, and training organization.
• Social Media: Follow on social platforms for updates.

Course Overview

• Focus: Understanding Linux as an ethical hacker.
• Target Audience: Beginners with no prior Linux experience.
• Key Topics Covered:
  • Installing and running Kali Linux
  • Navigating the file system
  • Common network commands
  • File operations (create, view, edit)
  • Managing services
  • Writing Bash scripts

Course Updates

• Previous Course: Taught for FreeCodeCamp two years ago.
• Current Edition: Using Kali Linux 2022.2, latest tools and materials.
• TCM Security Academy: Offers comprehensive courses on ethical hacking and Linux.

Virtual Machines (VMs)

• Definition: A machine on top of another machine (e.g., running Windows 10 on Windows 10).
• Usage: Building labs without needing extensive hardware.
• Requirements:
  • Minimum 8GB RAM for basic usage.
  • 16GB RAM recommended for Active Directory portions.
• Software Options:
  • VMware Workstation Player (Windows/Linux)
  • Oracle VirtualBox (Mac)

Installing Virtual Machine Software

• VMware Workstation Player: Download from official website.
• Oracle VirtualBox: Available for Mac users.
  • Install steps: Accept agreements, finish installation, restart if needed.

Installing Kali Linux

• Download: Access Kali Linux from the official website.
  • Choose the version for VMware or VirtualBox.
  • Extract files using 7-zip.
• Loading Kali:
  • Open the VM in VMware/VirtualBox.
  • Edit VM settings (RAM, network settings).
  • Login credentials: Username: kali, Password: kali.

Exploring Kali Linux Interface

• Familiarize with the Kali Linux environment.
• Navigating applications: Terminal, text editor, web browser, etc.
• Key utilities for ethical hacking embedded in the OS.

Terminal Commands Overview

Basic Navigation

• Print Working Directory: pwd
• Change Directory: cd [directory]
• List Files: ls
• Clear Screen: ctrl + l
• Make Directory: mkdir [directory_name]
• Remove Directory: rmdir [directory_name]

File Operations

• View File Contents: cat [filename]
• Copy Files: cp [source] [destination]
• Move Files: mv [source] [destination]
• Remove Files: rm [filename]
• Edit Files: Use editors like nano or graphical editors like mousepad.

User Management

• Create User: sudo adduser [username]
• View Users: Check /etc/passwd.
• Edit Sudo Privileges: Modify /etc/sudoers.

Networking Commands

• View IP Configuration: ip a or ifconfig
• Ping Command: ping [ip_address]
• Check Routing Table: ip r or route
• Check ARP Table: arp -a

Services Management

• Start/Stop Services: sudo service [service_name] start/stop
• Enable Service on Boot: sudo systemctl enable [service_name]
• Apache Web Server: Usage for hosting files (test with http://[your_ip_address]).

Tool Installation and Updates

• Update System: sudo apt update && sudo apt upgrade
• Install Tool: sudo apt install [tool_name]
• Using Git: git clone [repository_link] for tools from GitHub.

Bash Scripting Introduction

• Creating Scripts: Use nano [script_name.sh].
• Shebang: Include #!/bin/bash at the top of scripts.
• For Loops: Iterate over IP addresses for ping sweeps or other tasks.

Example: IP Sweep Script

• Using loops and commands for automation: #!/bin/bash for ip in $(seq 1 254); do ping -c 1 192.168.1.$ip | grep "64 bytes" | cut -d " " -f 4 | tr -d ':'; done

Conclusion

• Course Completion: Thank you for participating in the Linux for Ethical Hackers course.
• Further Learning: Consider subscribing for more courses and content on ethical hacking and related topics.