Tuesday, February 9, 2010

Sample HTTPs Server

HTTPS server

As similar to building HTTP server, we have to establish the ServerSocket with SSL certificates. Client has to confirm the certificate and its validity by checking the Certification Path.

EnabledCipherSuites

SSLServerSocket or SSLSocket provides api to retrieve the supported CipherSuites combinations


String[] ecs=socket.getEnabledCipherSuites();

Results:

SSL_RSA_WITH_RC4_128_MD5
SSL_RSA_WITH_RC4_128_SHA
TLS_RSA_WITH_AES_128_CBC_SHA
TLS_DHE_RSA_WITH_AES_128_CBC_SHA
TLS_DHE_DSS_WITH_AES_128_CBC_SHA
SSL_RSA_WITH_3DES_EDE_CBC_SHA
SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA
SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA
SSL_RSA_WITH_DES_CBC_SHA
SSL_DHE_RSA_WITH_DES_CBC_SHA
SSL_DHE_DSS_WITH_DES_CBC_SHA
SSL_RSA_EXPORT_WITH_RC4_40_MD5
SSL_RSA_EXPORT_WITH_DES40_CBC_SHA
SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA
SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA

EnabledProtocols

Supported security protocols are listed by getEnabledProtocols() APIs


String[] eps=socket.getEnabledProtocols()

Results:

SSLv2Hello
SSLv3
TLSv1

This protocol names used while creating SSLContext object.

KeyManagerFactory

This class holds the details of how the keys are managed to secure the sockets. Default would be SunX509. We can parallely come to know from file JAVA_HOME/jre/lib/security/java.security. Similarly, keystore type would be JKS


import java.io.BufferedInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.security.KeyStore;
import java.util.Enumeration;
import java.util.Properties;

import javax.net.ServerSocketFactory;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLServerSocket;

public class HTTPs {

 public static final String CONTENT_LENGTH = "Content-length";
 public static final String CONTENT_TYPE = "Content-type";

 private static char NEW_LINE = '\n';

 private static final String EOL = "\r\n";

 private BufferedInputStream is;
 private DataOutputStream os;
 String keystore = "/tmp/keystore.jks";
 char keystorepass[] = "welcome1".toCharArray();
 char keypassword[] = "welcome2".toCharArray();

 private static final String SC_NO_CONTENT = "HTTP/1.1 200 No Content" + EOL
   + "Content-Type: text/plain" + EOL + "Cache-Control: private" + EOL
   + EOL;

 // The port number which the server will be listening on
 public static final int HTTPS_PORT = 7777;

 public ServerSocket getServerSocket() throws Exception {

  KeyStore ks = getKeyStore();

  KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory
    .getDefaultAlgorithm());
  kmf.init(ks, keypassword);

  SSLContext sslcontext = SSLContext.getInstance("SSLv3");
  sslcontext.init(kmf.getKeyManagers(), null, null);
  ServerSocketFactory ssf = sslcontext.getServerSocketFactory();
  SSLServerSocket serversocket = (SSLServerSocket) ssf
    .createServerSocket(HTTPS_PORT);

  return serversocket;
 }

 private KeyStore getKeyStore() {
  try {
   KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
   ks.load(new FileInputStream(keystore), keystorepass);
   return ks;
  } catch (Exception e) {
   System.out.println(e.getLocalizedMessage());
   System.exit(-1);
  }

  return null;

 }

 // multi-threading -- create a new connection
 // for each request
 public void run() {
  ServerSocket listen;
  try {
   listen = getServerSocket();
   while (true) {
    Socket socket = listen.accept();

    is = new BufferedInputStream(socket.getInputStream());
    os = new DataOutputStream(socket.getOutputStream());
    readHTTPMessage();

    StringBuffer strbuffer = new StringBuffer();

    strbuffer.append(SC_NO_CONTENT);
    writebytes(socket, strbuffer.toString());
   }
  } catch (Exception e) {
   System.out.println("Exception: " + e.getMessage());
  }
 }

 private void writebytes(Socket socket, String data) {
  try {
   //
   os.write(data.getBytes());
   os.flush();
   if (!socket.isClosed())
    is.close();
   if (!socket.isClosed())
    os.close();

  } catch (Throwable e) {
   System.out.println(e);
  }

  try {
   if (!socket.isClosed())
    socket.close();
  } catch (Throwable e) {
   System.out.println("Problem in data writing in channel");
   System.out.println(e);
  }
 }

 public String readHTTPMessage() throws IOException {
  String result = null;
  StringBuffer strb = new StringBuffer();
  int bufferSize = 1024; // is.available()==0 ? 1024:is.available();
  int contentLength = 0;
  int headerLength = 0;
  int bodyLength = 0;
  try {
   byte[] buf = new byte[bufferSize];
   int nread = 0;
   while ((nread = is.read(buf)) != -1) {
    if (nread == 0)
     continue;
    strb.append(new String(buf, 0, nread));
    // System.out.println(strb);
    result = strb.toString();

    if (contentLength == 0) {

     // atleast 50 bytes required to identify content length
     if (result.length() < 50)
      continue;

     HTTPRequest request = new HTTPRequest(result.getBytes());
     String contentStr = getPropertyIgnoreCase(request
       .getHeaders(), CONTENT_LENGTH);

     // if length specified
     if (null == contentStr || "".equals(contentStr))
      break;

     contentLength = Integer.parseInt("" + contentStr.trim());
     bodyLength = request.getBodyContent().length;
     headerLength = result.length() - bodyLength;
    } else {
     bodyLength = result.length() - headerLength;
    }

    if (bodyLength < contentLength) {
     bufferSize = contentLength - bodyLength;
     buf = new byte[bufferSize];
    } else {

     if (bodyLength >= contentLength || result.endsWith(EOL)) {

      // try{socket.shutdownInput();}catch(Exception e){}
      break;
     }

    }
   }
  } catch (Exception e) {
   System.out.println(e);
  } finally {
   // try{is.close();}catch(Exception e){}

  }
  return result;
 }

 // main program
 public static void main(String argv[]) throws Exception {
  HTTPs https = new HTTPs();
  https.run();
 }

 private class HTTPRequest {

  private byte[] request;

  private int headerIndex = 0;

  private Properties headers;
  private byte[] bodyContent;

  public HTTPRequest(byte[] request) {

   this.request = request;
   init();

  }

  private void init() {

   if (request == null)
    return;

   for (int i = 0; i < request.length; i++) {
    if ((NEW_LINE == (char) request[i]) && (13 == request[i + 1])) {
     headerIndex = i;
     break;
    }
   }

   initHeaders();
   initBodyContent();
  }

  private void initHeaders() {
   String httpMethod;
   String httpVersion;
   String path;
   String headerContent = new String(request, 0, headerIndex);

   String[] availbleHeaders = headerContent.split("\n");

   if (availbleHeaders != null && availbleHeaders.length > 0) {
    String[] typeContainer = availbleHeaders[0].split(" ");

    if (typeContainer != null && typeContainer.length > 2) {
     httpMethod = typeContainer[0];
     path = typeContainer[1];
     httpVersion = typeContainer[2];
    }
   }

   if (availbleHeaders.length > 1) {
    this.headers = new Properties();

    for (int index = 1; index < availbleHeaders.length; index++) {
     String key = availbleHeaders[index].substring(0,
       availbleHeaders[index].indexOf(':'));
     String value = availbleHeaders[index].substring(
       availbleHeaders[index].indexOf(':') + 1,
       availbleHeaders[index].length() - 1);
     this.headers.put(key, value);
    }
   }
  }

  private void initBodyContent() {
   int bodyIndex = headerIndex + 3;
   bodyContent = new byte[request.length - bodyIndex];

   for (int i = (bodyIndex), j = 0; i < request.length; i++, j++) {
    bodyContent[j] = request[i];
   }
  }

  public Properties getHeaders() {
   return headers;
  }

  public byte[] getBodyContent() {
   return bodyContent;
  }
 }

 public static String getPropertyIgnoreCase(Properties props, String key) {
  String value = null;

  Enumeration enum0 = props.propertyNames();
  while (enum0.hasMoreElements()) {
   String name = (String) enum0.nextElement();
   if (key.equalsIgnoreCase(name)) {
    value = props.getProperty(name);
    break;
   }
  }

  return value;
 }
}

prerequisite: Create keystore and keep the same in /tmp folder as mentioned in http://www.javafundu.com/2010/02/keystore-and-keytool.html

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