##
# $Id$
##

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

require 'msf/core'

class Metasploit3 < Msf::Auxiliary

	# Order is important here
	include Msf::Auxiliary::Report
	include Msf::Auxiliary::Scanner
	include Msf::Exploit::Remote::Ftp

	def initialize
		super(
			'Name'        => 'FTP Bounce Port Scanner',
			'Version'     => '$Revision$',
			'Description' => %q{
				Enumerate TCP services via the FTP bounce PORT/LIST
				method, which can still come in handy every once in
				a while (I know of a server that still allows this
				just fine...).
			},
			'Author'      => 'Kris Katterjohn <katterjohn[at]gmail.com>',
			'License'     => MSF_LICENSE
		)

		register_options([
			OptString.new('PORTS', [true, "Ports to scan (e.g. 22-25,80,110-900)", "1-10000"]),
			OptAddress.new('BOUNCEHOST', [true, "FTP relay host"]),
			OptPort.new('BOUNCEPORT', [true, "FTP relay port", 21])
		])

		deregister_options('RHOST', 'RPORT')
	end

	def run_host(ip)
		ports = Rex::Socket.portspec_crack(datastore['PORTS'])

		if ports.empty?
			print_status("Error: No valid ports specified")
			return
		end

		datastore['RHOST'] = datastore['BOUNCEHOST']
		datastore['RPORT'] = datastore['BOUNCEPORT']

		return if not connect_login

		ports.each do |port|
			# Clear out the receive buffer since we're heavily dependent
			# on the response codes.  We need to do this between every
			# port scan attempt unfortunately.
			while true
				r = self.sock.get(0.25)
				break if not r or r.empty?
			end

			begin
				host = (ip.split('.') + [port / 256, port % 256]).join(',')

				resp = raw_send_recv("PORT #{host}\r\n")

				if resp =~ /^5/
					#print_error("Got error from PORT to #{ip}:#{port}")
					next
				elsif not resp
					next
				end

				resp = raw_send_recv("LIST\r\n")

				if resp =~ /^[12]/
					print_status(" TCP OPEN #{ip}:#{port}")
					report_service(:host => ip, :port => port)
				end
			rescue ::Exception
				print_status("Unknown error: #{$!}")
			end
		end
	end
end