metasploit-framework/modules/auxiliary/scanner/discovery/ipv6_neighbor.rb

##
# $Id$
##

##
# 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'

class Metasploit3 < Msf::Auxiliary

	include Msf::Exploit::Remote::Ipv6
	include Msf::Exploit::Remote::Capture
	include Msf::Auxiliary::Report
	include Msf::Auxiliary::Scanner


	def initialize
		super(
			'Name'        => 'IPv6 Local Neighbor Discovery',
			'Version'     => '$Revision$',
			'Description' => %q{
				Enumerate local IPv6 hosts which respond to Neighbor Solicitations with a link-local address.
				Note, that like ARP scanning, this usually cannot be performed beyond the local
				broadcast network.
		},
		'Author'      => 'belch',
		'License'     => MSF_LICENSE
		)

		register_options(
			[
				OptString.new('SHOST', [false, "Source IP Address"]),
				OptString.new('SMAC', [false, "Source MAC Address"]),
		], self.class)

		deregister_options('SNAPLEN', 'FILTER')
	end

	def run_batch_size
		datastore['BATCHSIZE'] || 256
	end

	def run_batch(hosts)
		open_pcap({'SNAPLEN' => 68, 'FILTER' => "arp[6:2] == 0x0002"})

		@netifaces = true
		if not netifaces_implemented?
			print_error("WARNING : Pcaprub is not uptodate, some functionality will not be available")
			@netifaces = false
		end

		print_status("Discovering IPv4 nodes via ARP...")

		@interface = datastore['INTERFACE'] || Pcap.lookupdev
		@shost = datastore['SHOST']
		@shost ||= get_ipv4_addr(@interface) if @netifaces
		raise RuntimeError ,'SHOST should be defined' unless @shost

		@smac  = datastore['SMAC']
		@smac ||= get_mac(@interface) if @netifaces
		raise RuntimeError ,'SMAC should be defined' unless @smac

		addrs = []

		begin
			found = {}
			hosts.each do |dhost|

				probe = buildprobe(@shost, @smac, dhost)
				capture.inject(probe)
				while(reply = getreply())
					next unless reply.is_arp?
					if not found[reply.arp_saddr_ip]
						print_status(sprintf("  %16s ALIVE",reply.arp_saddr_ip))
						addrs << [reply.arp_saddr_ip, reply.arp_saddr_mac]
						report_host(:host => reply.arp_saddr_ip, :mac=>reply.arp_saddr_mac)
						found[reply.arp_saddr_ip] = true
					end
				end
			end

			etime = ::Time.now.to_f + (hosts.length * 0.05)

			while (::Time.now.to_f < etime)
				while(reply = getreply())
					next unless reply.is_arp?
					if not found[reply.arp_saddr_ip]
						print_status(sprintf("  %16s ALIVE",reply.arp_saddr_ip))
						addrs << [reply.arp_saddr_ip, reply.arp_saddr_mac]
						report_host(:host => reply.arp_saddr_ip, :mac=>reply.arp_saddr_mac)
						found[reply.arp_saddr_ip] = true
					end
				end

				::IO.select(nil, nil, nil, 0.50)
			end

		ensure
			close_pcap()
		end

		neighbor_discovery(addrs)
	end

	def map_neighbor(nodes, adv)
		nodes.each do |node|
			ipv4_addr, mac_addr = node
			next unless adv.eth_saddr == mac_addr
			ipv6_addr = adv.ipv6_saddr
			return {:eth => mac_addr, :ipv4 => ipv4_addr, :ipv6 => ipv6_addr}
		end
		nil
	end

	def neighbor_discovery(neighs)
		print_status("Discovering IPv6 addresses for IPv4 nodes...")
		print_status("")

		smac  = @smac
		open_pcap({'SNAPLEN' => 68, 'FILTER' => "icmp6"})

		begin
			neighs.each do |neigh|
				host, dmac = neigh

				shost = ipv6_linklocaladdr(smac)
				neigh = ipv6_linklocaladdr(dmac)

				probe = buildsolicitation(smac, shost, neigh)

				capture.inject(probe)
				Kernel.select(nil,nil,nil,0.1)

				while(adv = getadvertisement())
					next unless adv.is_ipv6?

					addr = map_neighbor(neighs, adv)
					next if not addr

					print_status(sprintf("  %16s maps to %s",addr[:ipv4], addr[:ipv6]))
					report_note(
						:host   => addr[:ipv4],
						:type   => 'host.ipv4.ipv6.mapping',
						:data   => "system with IPv4 address #{addr[:ipv4]} matches to IPv6 address #{addr[:ipv6]}"
					)	# with this we have the results in our database

				end
			end

			etime = ::Time.now.to_f + (neighs.length * 0.5)

			while (::Time.now.to_f < etime)
				while(adv = getadvertisement())
					next if not adv

					addr = map_neighbor(neighs, adv)
					next if not addr

					print_status(sprintf("  %16s maps to %s",addr[:ipv4], addr[:ipv6]))
				end
				::IO.select(nil, nil, nil, 0.50)
			end

		ensure
			close_pcap()
		end
	end

	def buildprobe(shost, smac, dhost)
		p = PacketFu::ARPPacket.new
		p.eth_saddr = smac
		p.eth_daddr = "ff:ff:ff:ff:ff:ff"
		p.arp_opcode = 1
		p.arp_saddr_mac = p.eth_saddr
		p.arp_daddr_mac = p.eth_daddr
		p.arp_saddr_ip = shost
		p.arp_daddr_ip = dhost
		p.to_s
	end

	def getreply
		pkt = capture.next
		Kernel.select(nil,nil,nil,0.1)
		return if not pkt
		p = PacketFu::Packet.parse(pkt)
		return unless p.is_arp?
		return unless p.arp_opcode == 2
		p
	end

	def buildsolicitation(smac, shost, neigh)
		dmac = ipv6_soll_mcast_mac(neigh)
		dhost = ipv6_soll_mcast_addr6(neigh)

		p = PacketFu::IPv6Packet.new
		p.eth_saddr = smac
		p.eth_daddr = dmac
		p.ipv6_saddr = shost
		p.ipv6_daddr = dhost
		p.ipv6_next = 0x3a
		p.ipv6_hop = 255
		p.payload = ipv6_neighbor_solicitation(
			IPAddr.new(neigh).to_i,
			p.eth_src
		)
		p.ipv6_len = p.payload.size
		ipv6_checksum!(p)
		p.to_s
	end

	def getadvertisement
		pkt = capture.next
		Kernel.select(nil,nil,nil,0.1)
		return if not pkt
		p = PacketFu::Packet.parse(pkt)
		return unless p.is_ipv6?
		return unless p.ipv6_next == 0x3a
		return unless p.payload[0,2] == "\x88\x00"
		p
	end

end