metasploit-framework/modules/post/multi/gather/dns_bruteforce.rb

##
# ## This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'
require 'rex'
require 'msf/core/post/common'


class Metasploit3 < Msf::Post

	include Msf::Post::Common


	def initialize(info={})
		super( update_info( info,
				'Name'          => 'Multi Gather DNS Forward Lookup Bruteforce',
				'Description'   => %q{
					Brute force subdomains and hostnames via wordlist.
				},
				'License'       => MSF_LICENSE,
				'Author'        => [ 'Carlos Perez <carlos_perez[at]darkoperator.com>'],
				'Platform'      => [ 'win','linux', 'osx', 'bsd', 'solaris' ],
				'SessionTypes'  => [ 'meterpreter', 'shell' ]
			))
		register_options(
			[

				OptString.new('DOMAIN', [true, 'Domain to do a fordward lookup bruteforce against.']),
				OptPath.new('NAMELIST',[true, "List of hostnames or subdomains to use.",
						::File.join(Msf::Config.install_root, "data", "wordlists", "namelist.txt")])

			], self.class)
	end

	# Run Method for when run command is issued
	def run

		domain = datastore['DOMAIN']
		hostlst = datastore['NAMELIST']
		a = []

		print_status("Performing DNS Forward Lookup Bruteforce for Domain #{domain}")
		if session.type =~ /shell/
			# Only one thread possible when shell
			thread_num = 1
			# Use the shell platform for selecting the command
			platform = session.platform
		else
			# When in Meterpreter the safest thread number is 10
			thread_num = 10
			# For Meterpreter use the sysinfo OS since java Meterpreter returns java as platform
			platform = session.sys.config.sysinfo['OS']
		end

		name_list = []
		if ::File.exists?(hostlst)
			::File.open(hostlst).each do |n|
				name_list << n
			end
		end

		platform = session.platform

		case platform
		when /win/i
			cmd = "nslookup"
		when /solaris/i
			cmd = "/usr/sbin/host "
		else
			cmd = "/usr/bin/host "
		end
		while(not name_list.nil? and not name_list.empty?)
			1.upto(thread_num) do
				a << framework.threads.spawn("Module(#{self.refname})", false, name_list.shift) do |n|
					next if n.nil?
					vprint_status("Trying #{n.strip}.#{domain}")
					r = cmd_exec(cmd, "#{n.strip}.#{domain}")

					case session.platform
					when /win/
						proccess_win(r, "#{n.strip}.#{domain}")
					else
						process_nix(r, "#{n.strip}.#{domain}")
					end
				end
				a.map {|x| x.join }
			end
		end
	end

	# Process the data returned by nslookup
	def proccess_win(data,ns_opt)
		if data =~ /Name/
			# Remove unnecessary data and get the section with the addresses
			returned_data = data.split(/Name:/)[1]
			# check each element of the array to see if they are IP
			returned_data.gsub(/\r\n\t |\r\n|Aliases:|Addresses:/," ").split(" ").each do |e|
				if Rex::Socket.dotted_ip?(e)
					print_good("#{ns_opt} #{e}")
					report_host(:host=>e, :name=>ns_opt.strip)
				end
			end
		end
	end

	# Process the data returned by the host command
	def process_nix(r,ns_opt)
		r.each_line do |l|
			data = l.scan(/(\S*) has address (\S*)$/)
			if not data.empty?
				data.each do |e|
					print_good("#{ns_opt} #{e[1]}")
					report_host(:host=>e[1], :name=>ns_opt.strip)
				end
			end
		end
	end
end