145 lines
3.7 KiB
Ruby
145 lines
3.7 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class MetasploitModule < Msf::Auxiliary
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include Msf::Exploit::Capture
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include Msf::Auxiliary::Report
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include Msf::Auxiliary::Scanner
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def initialize
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super(
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'Name' => 'TCP SYN Port Scanner',
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'Description' => %q{
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Enumerate open TCP services using a raw SYN scan.
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},
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'Author' => 'kris katterjohn',
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'License' => MSF_LICENSE
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)
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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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OptInt.new('DELAY', [true, "The delay between connections, per thread, in milliseconds", 0]),
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OptInt.new('JITTER', [true, "The delay jitter factor (maximum value by which to +/- DELAY) in milliseconds.", 0]),
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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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# No IPv6 support yet
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def support_ipv6?
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false
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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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ports = Rex::Socket.portspec_crack(datastore['PORTS'])
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if ports.empty?
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raise Msf::OptionValidateError.new(['PORTS'])
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end
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jitter_value = datastore['JITTER'].to_i
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if jitter_value < 0
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raise Msf::OptionValidateError.new(['JITTER'])
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end
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delay_value = datastore['DELAY'].to_i
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if delay_value < 0
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raise Msf::OptionValidateError.new(['DELAY'])
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end
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open_pcap
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pcap = self.capture
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to = (datastore['TIMEOUT'] || 500).to_f / 1000.0
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# we copy the hosts because some may not be reachable and need to be ejected
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host_queue = hosts.dup
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# Spread the load across the hosts
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ports.each do |dport|
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host_queue.each do |dhost|
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shost, sport = getsource(dhost)
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self.capture.setfilter(getfilter(shost, sport, dhost, dport))
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# Add the delay based on JITTER and DELAY if needs be
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add_delay_jitter(delay_value,jitter_value)
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begin
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probe = buildprobe(shost, sport, dhost, dport)
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unless capture_sendto(probe, dhost)
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host_queue.delete(dhost)
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next
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end
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reply = probereply(self.capture, to)
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next if not reply
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if (reply.is_tcp? and reply.tcp_flags.syn == 1 and reply.tcp_flags.ack == 1)
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print_status(" TCP OPEN #{dhost}:#{dport}")
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report_service(:host => dhost, :port => dport)
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end
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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 SYN/ACKs and RSTs
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"tcp and (tcp[13] == 0x12 or (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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p = PacketFu::TCPPacket.new
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p.ip_saddr = shost
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p.ip_daddr = dhost
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p.tcp_sport = sport
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p.tcp_flags.ack = 0
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p.tcp_flags.syn = 1
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p.tcp_dport = dport
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p.tcp_win = 3072
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p.recalc
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p
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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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pkt = PacketFu::Packet.parse(r)
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next unless pkt.is_tcp?
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reply = pkt
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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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