168 lines
3.5 KiB
Ruby
168 lines
3.5 KiB
Ruby
##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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require 'racket'
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class Metasploit3 < Msf::Auxiliary
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include Msf::Exploit::Capture
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include Msf::Auxiliary::Scanner
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include Msf::Auxiliary::Report
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def initialize
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super(
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'Name' => 'TCP ACK Firewall Scanner',
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'Description' => %q{
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Map out firewall rulesets with a raw ACK scan. Any
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unfiltered ports found means a stateful firewall is
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not in place for them.
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},
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'Author' => 'kris katterjohn',
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'Version' => '$Revision$', # 03/26/2009
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'License' => MSF_LICENSE
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)
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begin
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require 'pcaprub'
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@@havepcap = true
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rescue ::LoadError
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@@havepcap = false
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end
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register_options([
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OptString.new('PORTS', [true, "Ports to scan (e.g. 22-25,80,110-900)", "1-10000"]),
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OptInt.new('TIMEOUT', [true, "The reply read timeout in milliseconds", 500]),
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OptInt.new('BATCHSIZE', [true, "The number of hosts to scan per set", 256]),
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OptString.new('INTERFACE', [false, 'The name of the interface'])
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], self.class)
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deregister_options('FILTER','PCAPFILE')
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end
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def run_batch_size
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datastore['BATCHSIZE'] || 256
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end
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def run_batch(hosts)
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open_pcap
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raise "Pcaprub is not available" if not @@havepcap
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pcap = self.capture
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ports = Rex::Socket.portspec_crack(datastore['PORTS'])
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if ports.empty?
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print_error("Error: No valid ports specified")
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return
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end
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to = (datastore['TIMEOUT'] || 500).to_f / 1000.0
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# Spread the load across the hosts
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ports.each do |dport|
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hosts.each do |dhost|
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shost, sport = getsource(dhost)
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pcap.setfilter(getfilter(shost, sport, dhost, dport))
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begin
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probe = buildprobe(shost, sport, dhost, dport)
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capture_sendto(probe, dhost)
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reply = probereply(pcap, to)
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next if not reply
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print_status(" TCP UNFILTERED #{dhost}:#{dport}")
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#Add Report
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report_note(
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:host => dhost,
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:proto => 'tcp',
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:port => dport,
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:type => "TCP UNFILTERED #{dhost}:#{dport}",
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:data => "TCP UNFILTERED #{dhost}:#{dport}"
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)
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rescue ::Exception
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print_error("Error: #{$!.class} #{$!}")
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end
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end
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end
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close_pcap
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end
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def getfilter(shost, sport, dhost, dport)
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# Look for associated RSTs
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"tcp and (tcp[13] & 0x04) != 0 and " +
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"src host #{dhost} and src port #{dport} and " +
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"dst host #{shost} and dst port #{sport}"
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end
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def getsource(dhost)
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# srcip, srcport
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[ Rex::Socket.source_address(dhost), rand(0xffff - 1025) + 1025 ]
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end
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def buildprobe(shost, sport, dhost, dport)
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n = Racket::Racket.new
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n.l3 = Racket::L3::IPv4.new
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n.l3.src_ip = shost
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n.l3.dst_ip = dhost
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n.l3.protocol = 0x6
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n.l3.id = rand(0x10000)
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n.l3.ttl = 255
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n.l4 = Racket::L4::TCP.new
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n.l4.src_port = sport
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n.l4.seq = rand(0x100000000)
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n.l4.ack = rand(0x100000000)
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n.l4.flag_ack = 1
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n.l4.dst_port = dport
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n.l4.window = 3072
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n.l4.fix!(n.l3.src_ip, n.l3.dst_ip, "")
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n.pack
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end
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def probereply(pcap, to)
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reply = nil
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begin
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Timeout.timeout(to) do
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pcap.each do |r|
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eth = Racket::L2::Ethernet.new(r)
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next if not eth.ethertype == 0x0800
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ip = Racket::L3::IPv4.new(eth.payload)
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next if not ip.protocol == 6
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tcp = Racket::L4::TCP.new(ip.payload)
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reply = {:raw => r, :eth => eth, :ip => ip, :tcp => tcp}
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break
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end
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end
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rescue Timeout::Error
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end
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return reply
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end
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end
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