Book Image

Python for Security and Networking - Third Edition

By : José Ortega
4 (2)
Book Image

Python for Security and Networking - Third Edition

4 (2)
By: José Ortega

Overview of this book

Python’s latest updates add numerous libraries that can be used to perform critical security-related missions, including detecting vulnerabilities in web applications, taking care of attacks, and helping to build secure and robust networks that are resilient to them. This fully updated third edition will show you how to make the most of them and improve your security posture. The first part of this book will walk you through Python scripts and libraries that you’ll use throughout the book. Next, you’ll dive deep into the core networking tasks where you will learn how to check a network’s vulnerability using Python security scripting and understand how to check for vulnerabilities in your network – including tasks related to packet sniffing. You’ll also learn how to achieve endpoint protection by leveraging Python packages along with writing forensics scripts. The next part of the book will show you a variety of modern techniques, libraries, and frameworks from the Python ecosystem that will help you extract data from servers and analyze the security in web applications. You’ll take your first steps in extracting data from a domain using OSINT tools and using Python tools to perform forensics tasks. By the end of this book, you will be able to make the most of Python to test the security of your network and applications.
Table of Contents (23 chapters)
1
Section 1: Python Environment and System Programming Tools
4
Section 2: Network Scripting and Packet Sniffing with Python
8
Section 3: Server Scripting and Port Scanning with Python
12
Section 4: Server Vulnerabilities and Security in Web Applications
16
Section 5: Python Forensics
20
Assessments – Answers to the End-of-Chapter Questions
21
Other Books You May Enjoy
22
Index

Implementing a simple TCP client and TCP server

In this section, we are going to introduce concepts for creating an application oriented to passing messages between a client and server using the TCP protocol. The concept behind the development of this application is that the socket server is responsible for accepting client connections from a specific IP address and port.

Implementing a server and client with sockets

In Python, a socket can be created that acts as a client or server.

The idea behind developing this application is that a client may connect to a given host, port, and protocol by a socket. The socket server, on the other hand, is responsible for receiving client connections within a particular port and protocol:

  1. First, create a socket object for the server:
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    
  2. Once the socket object has been created, we need to establish on which port our server will listen using the...