Book Image

Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

By : Paulino Calderon
Book Image

Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

By: Paulino Calderon

Overview of this book

This is the second edition of ‘Nmap 6: Network Exploration and Security Auditing Cookbook’. A book aimed for anyone who wants to master Nmap and its scripting engine through practical tasks for system administrators and penetration testers. Besides introducing the most powerful features of Nmap and related tools, common security auditing tasks for local and remote networks, web applications, databases, mail servers, Microsoft Windows machines and even ICS SCADA systems are explained step by step with exact commands and argument explanations. The book starts with the basic usage of Nmap and related tools like Ncat, Ncrack, Ndiff and Zenmap. The Nmap Scripting Engine is thoroughly covered through security checks used commonly in real-life scenarios applied for different types of systems. New chapters for Microsoft Windows and ICS SCADA systems were added and every recipe was revised. This edition reflects the latest updates and hottest additions to the Nmap project to date. The book will also introduce you to Lua programming and NSE script development allowing you to extend further the power of Nmap.
Table of Contents (18 chapters)
13
Brute Force Password Auditing Options
17
References and Additional Reading

Exception handling

The library nmap provides an exception handling mechanism for NSE scripts, which is designed to help with networking I/O tasks.

The exception handling mechanism from the nmap library works as expected. We wrap the code that we want to monitor for exceptions inside a nmap.try() call. The first value returned by the function indicates the completion status. If it returns false or nil, the second returned value must be an error string. The rest of the return values in a successful execution can be set and used as you wish. The catch function defined by nmap.new_try() will execute when an exception is raised.

The following example is a code snippet of the script mysql-vuln-cve2012-2122.nse ( http://nmap.org/nsedoc/scripts/mysql-vuln-cve2012-2122.html ). In this script, a catch function performs some simple garbage collection if a socket is left open:

   local catch = function()  socket:close() end...