Module: Watobo::NFQueue

Defined in:
lib/watobo/core/netfilter_queue.rb

Overview

:nodoc: all

Class Method Summary collapse

Class Method Details

.acquire_cert(host, port) ⇒ Object 



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# File 'lib/watobo/core/netfilter_queue.rb', line 125

def self.acquire_cert(host, port)
  puts "* acquire cert ... #{host}:#{port}"
  begin
    tcp_socket = TCPSocket.new( host, port )
    tcp_socket.setsockopt( Socket::SOL_SOCKET, Socket::SO_KEEPALIVE, 1)
    tcp_socket.sync = true
    ctx = OpenSSL::SSL::SSLContext.new()

    ctx.tmp_dh_callback = proc { |*args|
      OpenSSL::PKey::DH.new(128)
    }

    socket = OpenSSL::SSL::SSLSocket.new(tcp_socket, ctx)

    socket.connect
    #socket.setsockopt( Socket::SOL_SOCKET, Socket::SO_KEEPALIVE, 1)
    sk = "#{host}:#{port}"
    cert = socket.peer_cert
    @cert_list[sk] = cert
    puts "PEER CERT SUBJECT: #{cert.subject}"
    # puts cert.subject.methods.sort
    return cert

  rescue => bang
    puts bang
    puts bang.backtrace
  end
  return nil
end

.add_ssl_request(c_host, c_port, s_host, s_port) ⇒ Object 



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# File 'lib/watobo/core/netfilter_queue.rb', line 80

def self.add_ssl_request(c_host, c_port, s_host, s_port)
  ck = "#{c_host}:#{c_port}"
  sk = "#{s_host}:#{s_port}"

  begin

    unless @cert_list.has_key? sk
      if cert = acquire_cert(s_host,s_port)
      @ssl_requests[ck] = sk
      @cert_list[sk] = cert
      else
      return false
      end
    else
    @ssl_requests[ck] = sk
    end

    return true
  rescue => bang
    puts bang
    puts bang.backtrace
  end
  return false

end

.get_connection_info(c_host, c_port) ⇒ Object 



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# File 'lib/watobo/core/netfilter_queue.rb', line 106

def self.get_connection_info(c_host,c_port)
  begin
    ck = "#{c_host}:#{c_port}"
    target_site = nil
    cert = nil
    @netqueue_lock.synchronize do
      if @ssl_requests.has_key? ck
      target_site = @ssl_requests[ck]
      cert = @cert_list[target_site] if @cert_list.has_key? target_site
      end
    end
    return target_site, cert
  rescue => bang
    puts bang
    puts bang.backtrace
  end
  return nil, nil
end

.get_ip_string(raw_addr) ⇒ Object 



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# File 'lib/watobo/core/netfilter_queue.rb', line 19

def self.get_ip_string(raw_addr)
  begin
    ip = ""
    raw_addr.length.times do |i|
      ip << "." unless ip.empty?
      ip << raw_addr[i].ord.to_s
    end
  rescue => bang
    puts bang
    puts bang.backtrace
  end
  ip
end

.start ⇒ Object 



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# File 'lib/watobo/core/netfilter_queue.rb', line 37

def self.start
  #  @t_nfqueue.raise unless @t_nfqueue.nil?
  puts @t_nfqueue.status if @t_nfqueue.respond_to? :status

  puts "starting netfilter_queue ..."
  @t_nfqueue = Thread.new{
   begin
    Netfilter::Queue.create(0) do |p|
      puts ">> Netfilter Packet #" + p.id.to_s
    #  $stdout.flush
      puts p.data.class
      raw_src = p.data[12..15]
      raw_dst = p.data[16..19]
      src_port = p.data[20..21].unpack("H4")[0].hex
      dst_port = p.data[22..24].unpack("H4")[0].hex
     # if p.data.length > 47
     # flags = p.data[47].unpack("H*")[0].hex
     # puts flags.to_s
     # if flags == 2
      puts  "ADD SSL REQUEST"
      puts "#{get_ip_string(raw_src)}:#{src_port} -> #{get_ip_string(raw_dst)}:#{dst_port}"
       @netqueue_lock.synchronize do
      if add_ssl_request(get_ip_string(raw_src), src_port, get_ip_string(raw_dst), dst_port)
      puts "OK"
      end
      end
      #end
      #end
      Netfilter::Packet::ACCEPT
    end
  rescue => bang
   puts bang
   puts bang.backtrace
  # retry
  rescue Netfilter::QueueError
  puts "NetfilterERROR"
  exit
  end
  }

  @t_nfqueue
end

.stop ⇒ Object 



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# File 'lib/watobo/core/netfilter_queue.rb', line 33

def self.stop
  @t_nfqueue.kill if @t_nfqueue.respond_to? :kill
end