Class: Rex::Post::Meterpreter::Ui::Console::CommandDispatcher::Sniffer

Inherits:
Object
  • Object
show all
Includes:
Rex::Post::Meterpreter::Ui::Console::CommandDispatcher
Defined in:
lib/rex/post/meterpreter/ui/console/command_dispatcher/sniffer.rb

Overview

Packet sniffer extension user interface.

Constant Summary collapse

Klass =
Console::CommandDispatcher::Sniffer

Instance Attribute Summary

Attributes included from Ui::Text::DispatcherShell::CommandDispatcher

#shell, #tab_complete_items

Instance Method Summary collapse

Methods included from Rex::Post::Meterpreter::Ui::Console::CommandDispatcher

check_hash, #client, #log_error, #msf_loaded?, set_hash

Methods included from Ui::Text::DispatcherShell::CommandDispatcher

#cmd_help, #cmd_help_help, #cmd_help_tabs, #deprecated_cmd, #deprecated_commands, #deprecated_help, #help_to_s, #print, #print_error, #print_good, #print_line, #print_status, #print_warning, #tab_complete_filenames, #update_prompt

Constructor Details

#initialize(shell) ⇒ Sniffer

Initializes an instance of the sniffer command interaction.


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# File 'lib/rex/post/meterpreter/ui/console/command_dispatcher/sniffer.rb', line 23

def initialize(shell)
  super
end

Instance Method Details

#cmd_sniffer_dump(*args) ⇒ Object


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# File 'lib/rex/post/meterpreter/ui/console/command_dispatcher/sniffer.rb', line 117

def cmd_sniffer_dump(*args)
  intf = args[0].to_i
  if (intf == 0 or not args[1])
    print_error("Usage: sniffer_dump [interface-id] [pcap-file]")
    return
  end

  path_cap = args[1]
  path_raw = args[1] + '.raw'

  fd = ::File.new(path_raw, 'wb+')

  print_status("Flushing packet capture buffer for interface #{intf}...")
  res = client.sniffer.capture_dump(intf)
  print_status("Flushed #{res[:packets]} packets (#{res[:bytes]} bytes)")

  bytes_all = res[:bytes] || 0
  bytes_got = 0
  bytes_pct = 0
  linktype = res[:linktype]
  while (bytes_all > 0)
    res = client.sniffer.capture_dump_read(intf,1024*512)

    bytes_got += res[:bytes]

    pct = ((bytes_got.to_f / bytes_all.to_f) * 100).to_i
    if(pct > bytes_pct)
      print_status("Downloaded #{"%.3d" % pct}% (#{bytes_got}/#{bytes_all})...")
      bytes_pct = pct
    end
    break if res[:bytes] == 0
    fd.write(res[:data])
  end

  fd.close

  print_status("Download completed, converting to PCAP...")

  fd = nil
  if(::File.exist?(path_cap))
    fd = ::File.new(path_cap, 'ab+')
  else
    fd = ::File.new(path_cap, 'wb+')
    fd.write([0xa1b2c3d4, 2, 4, 0, 0, 65536, linktype].pack('NnnNNNN'))
  end

  pkts = {}
  od = ::File.new(path_raw, 'rb')


  # TODO: reorder packets based on the ID (only an issue if the buffer wraps)
  while(true)
    buf = od.read(20)
    break if not buf

    idh,idl,thi,tlo,len = buf.unpack('N5')
    break if not len
    if(len > 10000)
      print_error("Corrupted packet data (length:#{len})")
      break
    end

    pkt_id = (idh << 32) +idl
    pkt_ts = Rex::Proto::SMB::Utils.time_smb_to_unix(thi,tlo)
    pkt    = od.read(len)

    fd.write([pkt_ts,0,len,len].pack('NNNN')+pkt)
  end
  od.close
  fd.close

  ::File.unlink(path_raw)
  print_status("PCAP file written to #{path_cap}")
end

#cmd_sniffer_interfaces(*args) ⇒ Object


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# File 'lib/rex/post/meterpreter/ui/console/command_dispatcher/sniffer.rb', line 42

def cmd_sniffer_interfaces(*args)

  ifaces = client.sniffer.interfaces()

  print_line()

  ifaces.each do |i|
    print_line(sprintf("%d - '%s' ( type:%d mtu:%d usable:%s dhcp:%s wifi:%s )",
      i['idx'], i['description'],
      i['type'], i['mtu'], i['usable'], i['dhcp'], i['wireless'])
    )
  end

  print_line()

  return true
end

#cmd_sniffer_release(*args) ⇒ Object


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# File 'lib/rex/post/meterpreter/ui/console/command_dispatcher/sniffer.rb', line 104

def cmd_sniffer_release(*args)
  intf = args[0].to_i
  if (intf == 0)
    print_error("Usage: sniffer_release [interface-id]")
    return
  end

  res = client.sniffer.capture_release(intf)
  print_status("Flushed #{res[:packets]} packets (#{res[:bytes]} bytes) from interface #{intf}")

  return true
end

#cmd_sniffer_start(*args) ⇒ Object


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# File 'lib/rex/post/meterpreter/ui/console/command_dispatcher/sniffer.rb', line 60

def cmd_sniffer_start(*args)
  intf = args.shift.to_i
  if (intf == 0)
    print_error("Usage: sniffer_start [interface-id] [packet-buffer (1-200000)] [bpf filter (posix meterpreter only)]")
    return
  end
  maxp = (args.shift || 50000).to_i
  bpf  = args.join(" ")

  client.sniffer.capture_start(intf, maxp, bpf)
  print_status("Capture started on interface #{intf} (#{maxp} packet buffer)")
  return true
end

#cmd_sniffer_stats(*args) ⇒ Object


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# File 'lib/rex/post/meterpreter/ui/console/command_dispatcher/sniffer.rb', line 88

def cmd_sniffer_stats(*args)
  intf = args[0].to_i
  if (intf == 0)
    print_error("Usage: sniffer_stats [interface-id]")
    return
  end

  stats = client.sniffer.capture_stats(intf)
  print_status("Capture statistics for interface #{intf}")
  stats.each_key do |k|
    print_line("\t#{k}: #{stats[k]}")
  end

  return true
end

#cmd_sniffer_stop(*args) ⇒ Object


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# File 'lib/rex/post/meterpreter/ui/console/command_dispatcher/sniffer.rb', line 74

def cmd_sniffer_stop(*args)
  intf = args[0].to_i
  if (intf == 0)
    print_error("Usage: sniffer_stop [interface-id]")
    return
  end

  res = client.sniffer.capture_stop(intf)
  print_status("Capture stopped on interface #{intf}")
  print_status("There are #{res[:packets]} packets (#{res[:bytes]} bytes) remaining")
  print_status("Download or release them using 'sniffer_dump' or 'sniffer_release'")
  return true
end

#commandsObject

List of supported commands.


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# File 'lib/rex/post/meterpreter/ui/console/command_dispatcher/sniffer.rb', line 30

def commands
  {
    "sniffer_interfaces" => "Enumerate all sniffable network interfaces",
    "sniffer_start" => "Start packet capture on a specific interface",
    "sniffer_stop"  => "Stop packet capture on a specific interface",
    "sniffer_stats" => "View statistics of an active capture",
    "sniffer_dump"  => "Retrieve captured packet data to PCAP file",
    "sniffer_release" => "Free captured packets on a specific interface instead of downloading them",
  }
end

#nameObject

Name for this dispatcher sni


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# File 'lib/rex/post/meterpreter/ui/console/command_dispatcher/sniffer.rb', line 195

def name
  "Sniffer"
end