##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::HttpClient
  include Msf::Auxiliary::Scanner

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Apache HTTPD mod_negotiation Scanner',
        'Description'	=> %q{
          This module scans the webserver of the given host(s) for the existence of mod_negotiate.
          If the webserver has mod_negotiation enabled, the IP address will be displayed.
        },
        'Author' => [ 'diablohorn [at] gmail.com' ],
        'License'	=> MSF_LICENSE,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptString.new('PATH', [ true, "The path to detect mod_negotiation", '/']),
        OptString.new('FILENAME', [true, "Filename to use as a test", 'index'])
      ]
    )
  end

  def run_host(ip)
    ecode = nil
    emesg = nil

    tpath = datastore['PATH']
    tfile = datastore['FILENAME']

    if tpath[-1, 1] != '/'
      tpath += '/'
    end

    vhost = datastore['VHOST'] || ip
    prot = datastore['SSL'] ? 'https' : 'http'

    #
    # Send the request and parse the response headers for an alternates header
    #
    begin
      # Send the request the accept header is key here
      res = send_request_cgi({
        'uri' => tpath + tfile,
        'method' => 'GET',
        'ctype' => 'text/html',
        'headers'	=> { 'Accept' => 'a/b' }
      }, 20)

      return if not res

      # Check for alternates header
      if (res.code == 406)
        print_status(ip.to_s)
      end
    rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
    rescue ::Timeout::Error, ::Errno::EPIPE
    end
  end
end
