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  • Book Overview & Buying Mastering the Nmap Scripting Engine
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Mastering the Nmap Scripting Engine

Mastering the Nmap Scripting Engine

By : Paulino Calderon
5 (1)
Buy this Book
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Mastering the Nmap Scripting Engine

Mastering the Nmap Scripting Engine

5 (1)
By: Paulino Calderon
Buy this Book

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.
Table of Contents (23 chapters)
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Mastering the Nmap Scripting Engine
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Mastering the Nmap Scripting Engine
Credits
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Credits
About the Author
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About the Author
Acknowledgments
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Acknowledgments
About the Reviewers
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About the Reviewers
www.PacktPub.com
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www.PacktPub.com
Preface
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Preface
Lock Free Chapter
1
Introduction to the Nmap Scripting Engine
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Introduction to the Nmap Scripting Engine
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Installing Nmap
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Running NSE scripts
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Script categories
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Scan phases and NSE
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Applications of NSE scripts
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Setting up a development environment
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Adding new scripts
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Summary
2
Lua Fundamentals
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Lua Fundamentals
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Quick notes about Lua
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Flow control structures
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Data types
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String handling
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Common data structures
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I/O operations
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Coroutines
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Metatables and metamethods
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Summary
3
NSE Data Files
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NSE Data Files
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Locating your data directory
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Data directory search order
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Username and password lists used in brute-force attacks
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Web application auditing data files
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DBMS-auditing data files
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Java Debug Wire Protocol data files
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Other NSE data files
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Other Nmap data files
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Summary
4
Exploring the Nmap Scripting Engine API and Libraries
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Exploring the Nmap Scripting Engine API and Libraries
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Understanding the structure of an NSE script
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Exploring environment variables
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Accessing the Nmap API
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The NSE registry
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Writing NSE libraries
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Exploring other popular NSE libraries
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Summary
5
Enhancing Version Detection
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Enhancing Version Detection
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Understanding version detection mode in NSE
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Writing your own version detection scripts
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Examples of version detection scripts
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Summary
6
Developing Brute-force Password-auditing Scripts
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Developing Brute-force Password-auditing Scripts
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Working with the brute NSE library
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Reading usernames and password lists with the unpwdb NSE library
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Managing user credentials found during scans
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Writing an NSE script to launch password-auditing attacks against the MikroTik RouterOS API
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Summary
7
Formatting the Script Output
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Formatting the Script Output
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Output formats and Nmap Scripting Engine
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XML structured output
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Printing verbosity messages
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Including debugging information
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The weakness of the grepable format
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NSE script output in the HTML report
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Summary
8
Working with Network Sockets and Binary Data
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Working with Network Sockets and Binary Data
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Working with NSE sockets
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Understanding advanced network I/O
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Manipulating raw packets
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Raw packet handling and NSE sockets
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Summary
9
Parallelism
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Parallelism
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Parallelism options in Nmap
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Parallelism mechanisms in Lua
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Parallelism mechanisms in NSE
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Consuming TCP connections with NSE
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Summary
10
Vulnerability Detection and Exploitation
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Vulnerability Detection and Exploitation
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Vulnerability scanning
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Reporting vulnerabilities
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Summary
1
Scan Phases
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Scan Phases
2
NSE Script Template
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NSE Script Template
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Other templates online
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Script Categories
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Script Categories
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Nmap Options Mind Map
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Nmap Options Mind Map
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References
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References
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Index
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Index

Writing your own version detection scripts

When writing our own NSE scripts, we will use the API provided by Nmap to interact with the host and port database. To write a version script, we simply need to do the following:

  1. Add your script to the category version.

  2. Write the corresponding portrule.

  3. Set the port version in our script after successful detection.

Defining the category of a version detection script

The first step is very straightforward. In your NSE script, add the category field as follows:

category = {"version"}

The category field is actually a regular Lua table, so feel free to add more categories to your script if necessary.

Defining the portrule of a version detection script

The next important thing is to have a portrule matching the desired service. Keep in mind that we have function aliases that will help define these portrules, such as:

  • shortport.portnumber(port, protos, states)

  • shortport.version_port_or_service(ports, services, protos, states)

  • shortport.port_or_service(ports, services...

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Tech Concepts
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Programming languages
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Mastering the Nmap Scripting Engine
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