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Table Of Contents

NMAP Essentials

By : Shaw

4 (1)

NMAP Essentials

4 (1)

By: Shaw

Overview of this book

This book is for beginners who wish to start using Nmap, who have experience as a system administrator or of network engineering, and who wish to get started with Nmap.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Introduction to Nmap

1. Introduction to Nmap

Nmap's humble beginnings

The many uses of Nmap

Installing Nmap

Building Nmap from source

Summary

2. Network Fundamentals

2. Network Fundamentals

The structure of the Internet

The OSI model

Port scanning

TCP and UDP

Service banners

Summary

3. Nmap Basics

3. Nmap Basics

How to choose a target

Running a default scan

Service version scans

Logging scans

Specified scan ranges

Understanding the reason flag

Summary

4. Advanced Nmap Scans

4. Advanced Nmap Scans

Host detection methods

Running a ping agnostic scan

Scanning UDP services

Special TCP scans

Operating system detection

Increasing verbosity in scans

Packet tracing

Summary

5. Performance Optimization

5. Performance Optimization

Nmap timing optimization

Customized host group sizes

Increasing and decreasing parallelism

Dealing with stuck hosts

Delaying and increasing probe rates

Summary

6. Introduction to the Nmap Scripting Engine

6. Introduction to the Nmap Scripting Engine

The history of the NSE

The inner working of the NSE

Finding Nmap scripts

Running Nmap scripts

Summary

7. Writing Nmap Scripts

7. Writing Nmap Scripts

Anatomy of an Nmap script

Defining an Nmap script – script headers

Triggering functions – the rule

Defining a script's action

Summary

8. Additional Nmap Tools

8. Additional Nmap Tools

Attacking services with Ncrack

Host detection with Nping

File transfers and backdoors with Ncat

Comparing Nmap results with Ndiff

Summary

9. Vulnerability Assessments and Tools

9. Vulnerability Assessments and Tools

Conducting vulnerability scans with Nessus

Assessing web server issues with Nikto

Identifying sensitive web directories with DirBuster

Getting started with intercepting proxies

Summary

10. Penetration Testing with Metasploit

10. Penetration Testing with Metasploit

Installing Metasploit

Scanning with Metasploit

Attacking services with Metasploit

What to learn next

Summary

Index

Index

Chapter 7. Writing Nmap Scripts

Now that we have covered how the NSE works, it's time to learn how to write our first Nmap script. Because of the versatile and extremely customized nature of writing Nmap scripts, there are several different ways to produce a script that performs various functions—and also many pros and cons to write your own script.

While creating an Nmap script from scratch may not always be the fastest way to get things done (as there is almost always a script that already exists for whatever purpose you may need), there are certain situations during which leveraging the powerful built-in functions of the Nmap scripting engine leads to exactly the right circumstances to write your own script.

In this chapter, we will cover the following topics:

The anatomy of an Nmap script
Writing the Nmap script's head
Creating a rule
Defining a script's action
Debugging Nmap scripts

CONTINUE READING

83

Tech Concepts

36

Programming languages

73

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