Port Knocking allows one to open/close a remote port in the firewall of a server with the usage of a […]
Getting Reverse Shells
Reverse Shell is useful to pass through router and firewalls that may allow outbound connections but not inbound ones. Listener: […]
SSH Audit Server and Client Ubuntu 20.04
Installing the SSH Audit tool: sudo snap install ssh-audit OR pip3 install ssh-audit OR docker pull positronsecurity/ssh-audit Auditing SSH hosts: […]
Reverse Proxy with NGINX and SSL/TLS (Let’s Encrypt)
In this tutorial, we will go through: Install and configure NGINX, Install and configure SSL/TLS, Configure NGINX as a reverse […]
SED Cheat Sheet – Stream Editor with RegEx
Sed is a text/string editor command-line tool. Follow the most basic commands: sed ‘s/LOOKFOR/REPLACE/‘ file.txt reading the file, look for a […]
E-mail Backup Server with Postfix on Ubuntu 20.04
Add another MX record on the domain DNS with a priority different (e.g. 10) from the main server (zero). 0 […]
Linux Active Directory / Domain Controller (AD-DC) with Zentyal
Zentyal is an open-source email and groupware solution. It has its own Ubuntu-based distribution but also offers a repository for […]
Installing a GUI on Ubuntu Server 20.04
Installing a Graphical User Interface (GUI) on a Linux Server instance is a method to create a desktop environment on […]
Linux as Active Directory / Domain Controller (AD-DC) Replication
sudo apt update && sudo apt upgrade -y sudo hostnamectl set-hostname ad1 sudo nano /etc/hosts Add the following line replacing […]
SAMBA Sharing with AD Permissions on Ubuntu 20.04
This post is a continuation of the posts: Linux as AD-DC Principal [Link], Linux as AD-DC Replication [Link], Joining Ubuntu […]