Lua Fundamentals | Mastering the Nmap Scripting Engine

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Mastering the Nmap Scripting Engine

By : Paulino Calderon

5 (1)

Mastering the Nmap Scripting Engine

5 (1)

By: Paulino Calderon

Overview of this book

If you want to learn to write your own scripts for the Nmap Scripting Engine, this is the book for you. It is perfect for network administrators, information security professionals, and even Internet enthusiasts who are familiar with Nmap.

Mastering the Nmap Scripting Engine

Mastering the Nmap Scripting Engine

Credits

Credits

About the Author

About the Author

Acknowledgments

Acknowledgments

About the Reviewers

About the Reviewers

www.PacktPub.com

www.PacktPub.com

Preface

Preface

Free Chapter

Introduction to the Nmap Scripting Engine

Introduction to the Nmap Scripting Engine

Installing Nmap

Running NSE scripts

Script categories

Scan phases and NSE

Applications of NSE scripts

Setting up a development environment

Adding new scripts

Summary

Lua Fundamentals

Lua Fundamentals

Quick notes about Lua

Flow control structures

Data types

String handling

Common data structures

I/O operations

Coroutines

Metatables and metamethods

Summary

NSE Data Files

NSE Data Files

Locating your data directory

Data directory search order

Username and password lists used in brute-force attacks

Web application auditing data files

DBMS-auditing data files

Java Debug Wire Protocol data files

Other NSE data files

Other Nmap data files

Summary

Exploring the Nmap Scripting Engine API and Libraries

Exploring the Nmap Scripting Engine API and Libraries

Understanding the structure of an NSE script

Exploring environment variables

Accessing the Nmap API

The NSE registry

Writing NSE libraries

Exploring other popular NSE libraries

Summary

Enhancing Version Detection

Enhancing Version Detection

Understanding version detection mode in NSE

Writing your own version detection scripts

Examples of version detection scripts

Summary

Developing Brute-force Password-auditing Scripts

Developing Brute-force Password-auditing Scripts

Working with the brute NSE library

Reading usernames and password lists with the unpwdb NSE library

Managing user credentials found during scans

Writing an NSE script to launch password-auditing attacks against the MikroTik RouterOS API

Summary

Formatting the Script Output

Formatting the Script Output

Output formats and Nmap Scripting Engine

XML structured output

Printing verbosity messages

Including debugging information

The weakness of the grepable format

NSE script output in the HTML report

Summary

Working with Network Sockets and Binary Data

Working with Network Sockets and Binary Data

Working with NSE sockets

Understanding advanced network I/O

Manipulating raw packets

Raw packet handling and NSE sockets

Summary

Parallelism

Parallelism

Parallelism options in Nmap

Parallelism mechanisms in Lua

Parallelism mechanisms in NSE

Consuming TCP connections with NSE

Summary

Vulnerability Detection and Exploitation

Vulnerability Detection and Exploitation

Vulnerability scanning

Reporting vulnerabilities

Summary

Scan Phases

Scan Phases

NSE Script Template

NSE Script Template

Other templates online

Script Categories

Script Categories

Nmap Options Mind Map

Nmap Options Mind Map

References

References

Index

Index

Metatables and metamethods

Metamethods allow us to change the behavior of a table by writing custom functions for operators—such as comparing objects, arithmetical operations, and more. For example, let's say we would like to overload the "add" functionality of our table object with a new function that adds certain fields we select. Normally, the addition operation isn't valid on tables but, with metatables, we can overwrite the __add metamethod to perform whatever we need.

Arithmetic metamethods

The metamethods supported by Lua tables are as follows:

Metamethod	Description
`__add`	Addition operator
`__mul`	Multiplication operator
`__sub`	Subtraction operator
`__div`	Division operator
`__unm`	Negation operator
`__pow`	Exponentiation operator
`__concat`	Concatenation operator

Relational metamethods

The following relational metamethods are also supported by Lua tables:

Metamethod	Description
`__eq`	Equality
`__lt`	Less than
`__le`	Less than or equal to

The setmetatable function is used to set...

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