Class: Watobo::NFQ::Connections

Inherits:
Object
  • Object
show all
Defined in:
bin/nfq_server.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Connections

Returns a new instance of Connections.



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# File 'bin/nfq_server.rb', line 93

def initialize
  @connections = Hash.new
  @cert_list = Hash.new
  @netqueue_lock = Mutex.new
  @dh_key = OpenSSL::PKey::DH.new(512)
  @nfqueue = start
end

Instance Attribute Details

#nfqueue ⇒ Object (readonly)

Returns the value of attribute nfqueue.



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# File 'bin/nfq_server.rb', line 39

def nfqueue
  @nfqueue
end

Instance Method Details

#acquire_cert(host, port) ⇒ Object 



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# File 'bin/nfq_server.rb', line 101

def 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|
      @dh_key
    }

    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
    @netqueue_lock.synchronize do
      @cert_list[sk] = cert
    end
    # puts cert.subject.methods.sort
    return cert

  rescue => bang
    puts bang
    puts bang.backtrace if $DEBUG
  end
  return nil
end

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



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# File 'bin/nfq_server.rb', line 40

def 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)
      @connections[ck] = sk
      @cert_list[sk] = cert
      else
      return false
      end
    else
    @connections[ck] = sk
    end

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

end

#info(data) ⇒ Object 



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# File 'bin/nfq_server.rb', line 70

def info(data)
  begin
    ck = "#{data['host']}:#{data['port']}"
    target_site = ''
    cert_cn = ''
    @netqueue_lock.synchronize do
      if @connections.has_key? ck
        target_site = @connections[ck]
        if @cert_list.has_key? target_site
          cert = @cert_list[target_site]
          cert_cn = cert.subject.to_s.gsub(/.*=/,"")
        end
      end
    end
    r = { 'target' => target_site, 'cn' => cert_cn}
    return r
  rescue => bang
    puts bang
    puts bang.backtrace
  end
  return {}
end

#start ⇒ Object 



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# File 'bin/nfq_server.rb', line 132

def start

  puts "starting netfilter_queue ..."
  t = 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 "NFQ >> #{get_ip_string(raw_src)}:#{src_port} -> #{get_ip_string(raw_dst)}:#{dst_port}"
        add_ssl_request(get_ip_string(raw_src), src_port, get_ip_string(raw_dst), dst_port)

        Netfilter::Packet::ACCEPT
      end
    rescue => bang
      puts bang
      puts bang.backtrace
      # retry
    rescue Netfilter::QueueError
      puts "NetfilterERROR"
      exit
    end
  }

  t
end

#to_yaml ⇒ Object 



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# File 'bin/nfq_server.rb', line 66

def to_yaml
  @connections.to_yaml
end