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/** Notice of modification as required by the LGPL
* This file was modified by Gemstone Systems Inc. on
* $Date$
**/
// changes made by mandar
// Added .* imports
// replacing SecretKey with SecretKey
// $Id: ENCRYPT1_4.java,v 1.8 2005/08/08 12:45:42 belaban Exp $
package com.gemstone.org.jgroups.protocols;
import com.gemstone.org.jgroups.Address;
import com.gemstone.org.jgroups.Event;
import com.gemstone.org.jgroups.Message;
import com.gemstone.org.jgroups.View;
import com.gemstone.org.jgroups.stack.Protocol;
import com.gemstone.org.jgroups.util.ExternalStrings;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.security.*;
import java.security.spec.X509EncodedKeySpec;
import java.util.Properties;
import java.util.Vector;
/**
* ENCRYPT1_4 layer. Encrypt and decrypt the group communication in JGroups
*/
public class ENCRYPT1_4 extends Protocol {
public static class EncryptHeader extends com.gemstone.org.jgroups.Header {
int type;
static final int ENCRYPT=0;
static final int KEY_REQUEST=1;
static final int SERVER_PUBKEY=2;
static final int SECRETKEY=3;
static final int SECRETKEY_READY=4;
// adding key for Message object purpose
static final String KEY="encrypt";
public EncryptHeader(){}
public EncryptHeader(int type) {
this.type=type;
}
public void writeExternal(java.io.ObjectOutput out) throws IOException {
out.writeInt(type);
}
public void readExternal(java.io.ObjectInput in) throws IOException, ClassNotFoundException {
type=in.readInt();
}
@Override // GemStoneAddition
public String toString() {
return "[ENCTYPT: ]";
}
}
Address local_addr=null;
Address keyServerAddr=null;
boolean keyServer=false;
String asymAlgorithm="RSA";
String symAlgorithm="DES/ECB/PKCS5Padding";
int asymInit=512; // initial public/private key length
int symInit=56; // initial shared key length
// for public/private Key
KeyPair Kpair; // to store own's public/private Key
SecretKey desKey=null;
final PublicKey pubKey=null; // for server to store the temporary client public key
// PublicKey serverPubKey=null; // for client to store server's public Key GemStoneAddition(omitted)
Cipher cipher;
Cipher rsa;
final Vector members=new Vector();
final Vector notReady=new Vector();
public ENCRYPT1_4() {
//Provider prov = Security.getProvider("SUN");
//Security.addProvider(prov);
}
@Override // GemStoneAddition
public String getName() {
return "ENCRYPT1_4";
}
/*
* GetAlgorithm: Get the algorithm name from "algorithm/mode/padding"
*/
private static String getAlgorithm(String s) {
int index=s.indexOf("/");
if(index == -1)
return s;
return s.substring(0, index);
}
@Override // GemStoneAddition
public boolean setProperties(Properties props) {
String str;
super.setProperties(props);
// asymmetric key length
str=props.getProperty("asymInit");
if(str != null) {
asymInit=Integer.parseInt(str);
props.remove("asymInit");
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_ASYM_ALGO_BITS_USED_IS__0, asymInit);
}
// symmetric key length
str=props.getProperty("symInit");
if(str != null) {
symInit=Integer.parseInt(str);
props.remove("symInit");
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_SYM_ALGO_BITS_USED_IS__0, symInit);
}
// asymmetric algorithm name
str=props.getProperty("asymAlgorithm");
if(str != null) {
asymAlgorithm=str;
props.remove("asymAlgorithm");
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_ASYM_ALGO_USED_IS__0, asymAlgorithm);
}
// symmetric algorithm name
str=props.getProperty("symAlgorithm");
if(str != null) {
symAlgorithm=str;
props.remove("symAlgorithm");
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_SYM_ALGO_USED_IS__0, symAlgorithm);
}
if(props.size() > 0) {
if(log.isErrorEnabled()) log.error(ExternalStrings.ENCRYPT1_4_THESE_PROPERTIES_ARE_NOT_RECOGNIZED__0, props);
return false;
}
return true;
}
@Override // GemStoneAddition
public void init() throws Exception {
// generate keys according to the specified algorithms
// generate publicKey and Private Key using RSA
KeyPairGenerator KpairGen=KeyPairGenerator.getInstance(getAlgorithm(asymAlgorithm));
KpairGen.initialize(asymInit, new SecureRandom());
Kpair=KpairGen.generateKeyPair();
// generate secret key
KeyGenerator keyGen=KeyGenerator.getInstance(getAlgorithm(symAlgorithm));
keyGen.init(symInit);
desKey=keyGen.generateKey();
// initialize for rsa, cipher encryption/decryption
rsa=Cipher.getInstance(asymAlgorithm);
cipher=Cipher.getInstance(symAlgorithm);
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_BOTH_ASYM_AND_SYM_ALGO_INITIALIZED_WITH_THE_SINGLE_SHARED_KEY);
}
/** Just remove if you don't need to reset any state */
public static void reset() {
}
@Override // GemStoneAddition
public void up(Event evt) {
Message msg;
Message newMsg;
EncryptHeader hdr;
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_EVENT_GOING_UP_IS__0, evt);
switch(evt.getType()) {
case Event.SET_LOCAL_ADDRESS:
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_SET_ADDRESS_CALL);
local_addr=(Address)evt.getArg();
break;
case Event.FIND_INITIAL_MBRS_OK:
Vector member=(Vector)evt.getArg();
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_FIND_INIT_MEMBERS_CALL_LEFT_MEMBERS_ARE__0, member.size());
// this check is required, to prevent keyServer= false when adding itself
if (!keyServer)
keyServer=member.size() <= 0;
if(member != null && member.size() > 0)
keyServerAddr=((PingRsp) member.firstElement()).coord_addr;
else
keyServerAddr=local_addr;
if(!keyServer)
{
desKey=null;
if(log.isDebugEnabled()) log.debug("This is not keyserver, deskey set to null");
// client send clien's public key to server and request server's public key
newMsg=new Message(keyServerAddr, local_addr, Kpair.getPublic().getEncoded());
// making changes (MANDAR)
newMsg.putHeader(EncryptHeader.KEY, new EncryptHeader(EncryptHeader.KEY_REQUEST));
passDown(new Event(Event.MSG, newMsg));
}
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_DONE_PARSING_FOR_ENCRYPT_HEADERS_SENDING_UPWARDS_0, evt);
passUp(evt);
return;
case Event.MSG:
msg=(Message) evt.getArg();
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_THIS_IS_A_MESSAGE_FROM_PEER_NOT_CONTROL_HEADER_0, msg);
// making changes (MANDAR)
if(msg == null) {
if(log.isDebugEnabled()) log.debug("Null message");
passUp(evt);
return;
}
// making changes (MANDAR)
//Object obj=msg.peekHeader();
Object obj=msg.removeHeader(EncryptHeader.KEY);
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_STRIPPING_THE_REQUIRED_PROTOCOL_HEADER);
// if not encrypted message, pass up
if(obj == null || !(obj instanceof EncryptHeader)) {
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_DROPPING_PACKAGE_AS_ENCRYPT1_4_PROTOCOL_IS_NOT_BEEN_RECOGNIZED_MSG_WILL_NOT_BE_PASSED_UP);
// BELA comment this out in case U think otherwise
//passUp(evt);
return;
}
// making changes (MANDAR)
//hdr = (EncryptHeader)msg.removeHeader();
hdr=(EncryptHeader) obj;
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_HEADER_RECEIVED_0_1, new Object[] {hdr, Integer.valueOf(hdr.type)});
switch(hdr.type) {
// key request from client and send server's public key to client
case EncryptHeader.KEY_REQUEST:
try {
if(log.isDebugEnabled()) log.debug("Request for key");
// store the this client to notReady list using client's address
notReady.addElement(msg.getSrc());
// store the client's public key for temporary
PublicKey tmpPubKey=generatePubKey(msg.getBuffer());
if(log.isDebugEnabled()) log.debug("Generated requestors public key");
// send server's publicKey
newMsg=new Message(msg.getSrc(), local_addr, Kpair.getPublic().getEncoded());
// making changes (MANDAR)
newMsg.putHeader(EncryptHeader.KEY, new EncryptHeader(EncryptHeader.SERVER_PUBKEY));
if(log.isDebugEnabled()) log.debug("Encoded servers public key using clients public key, only client can debug it using its private key and sending it back");
passDown(new Event(Event.MSG, newMsg));
// my changes (MANDAR)
rsa.init(Cipher.ENCRYPT_MODE, tmpPubKey);
byte[] encryptedKey = rsa.doFinal(desKey.getEncoded());
if(log.isDebugEnabled()) log.debug(" Generated encoded key which only client can decode");
// send shared DesKey to client
// 1. Decrypt desKey with server's own private Key
// 2. Encrypt decrypted desKey with client's own public Key
// encrypt encoded desKey using server's private key
/*
rsa.init(Cipher.ENCRYPT_MODE, Kpair.getPrivate());
byte[] decryptedKey=rsa.doFinal(desKey.getEncoded());
// encrypt decrypted key using client's public key
rsa.init(Cipher.ENCRYPT_MODE, pubKey);
byte[] encryptedKey=rsa.doFinal(decryptedKey);
*/
//send encrypted deskey to client
newMsg=new Message(msg.getSrc(), local_addr, encryptedKey);
// making changes (MANDAR)
newMsg.putHeader(EncryptHeader.KEY, new EncryptHeader(EncryptHeader.SECRETKEY));
if(log.isDebugEnabled()) log.debug(" Sending encoded key to client");
passDown(new Event(Event.MSG, newMsg));
}
catch(Exception e) {
e.printStackTrace();
System.out.println(e + "0");
}
return;
case EncryptHeader.SECRETKEY_READY:
//server get client's public key and generate the secret key
notReady.removeElement(msg.getSrc());
if(log.isDebugEnabled()) log.debug("Removed client " + msg.getSrc() + "from notready list");
return;
case EncryptHeader.SERVER_PUBKEY:
/*serverPubKey=GemStoneAddition*/generatePubKey(msg.getBuffer());
if(log.isDebugEnabled()) log.debug(" Obtained the servers public key");
return;
case EncryptHeader.SECRETKEY:
try {
// decrypt using client's private Key
rsa.init(Cipher.DECRYPT_MODE, Kpair.getPrivate());
// my changes (MANDAR)
byte[] encodedKey = rsa.doFinal(msg.getBuffer());
if(log.isDebugEnabled()) log.debug("generating encoded key obtained from server-admin");
/* Piece commented out by MANDAR
byte[] decryptedKey=rsa.doFinal(msg.getBuffer());
// decrypt using server's public Key
rsa.init(Cipher.DECRYPT_MODE, serverPubKey);
byte[] encodedKey=rsa.doFinal(decryptedKey);
*/
// decode secretKey
desKey=decodedKey(encodedKey);
if(desKey == null)
log.error(ExternalStrings.ENCRYPT1_4_OHH_OH__DES_KEY_IS_NULL);
// send ready message (MANDAR) null -> ""
newMsg=new Message(msg.getSrc(), local_addr, null);
// making changes (MANDAR)
newMsg.putHeader(EncryptHeader.KEY, new EncryptHeader(EncryptHeader.SECRETKEY_READY));
passDown(new Event(Event.MSG, newMsg));
if(log.isDebugEnabled()) log.debug("Got the deskey, sending down sec_Ready header");
}
catch(Exception e) {
e.printStackTrace();
System.out.println(e + "5");
}
return;
default:
break;
}
if (hdr.type != 0)
log.error(ExternalStrings.ENCRYPT1_4_ERROR__HEADER_IS_NOT_0);
// not have shared key yet
// this encrypted message is of no use, drop it
if(desKey == null) return;
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_STARTING_TO_DECYPHER_MESSAGES);
// if both the shared key and incoming message are not null
// decrypt the message
if(msg.getBuffer() != null) {
try {
cipher.init(Cipher.DECRYPT_MODE, desKey);
msg.setBuffer(cipher.doFinal(msg.getBuffer()));
}
catch(Exception e) {
e.printStackTrace();
}
}
break;
}
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_PASSING_UP_EVENT);
passUp(evt); // Pass up to the layer above us
}
@Override // GemStoneAddition
public void down(Event evt) {
Message msg;
Message newMsg;
boolean leave=false;
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_DOWNEVT_IS_0_1, new Object[] {evt, Integer.valueOf(evt.getType())});
switch(evt.getType()) {
case Event.VIEW_CHANGE:
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_VIEW_CHANGE_CALL_NEW_MEMBER_COMING_IN);
Vector new_members=((View)evt.getArg()).getMembers();
// member size decreases: member leaves, need a new key
if(members.size() > new_members.size()) leave=true;
// copy member list
synchronized(members) {
members.removeAllElements();
if(/*new_members != null && GemStoneAddition (cannot be null) */ new_members.size() > 0)
for(int i=0; i < new_members.size(); i++)
members.addElement(new_members.elementAt(i));
}// end of sync
// redistribute/regain the new key because old member leaves
if(leave) {
// get coordinator address
Object obj=members.firstElement();
// if I'm the coordinator/key-server
if(obj.equals(local_addr)) {
//create the new shared key and distribute
keyServer=true;
keyServerAddr=local_addr;
// reset shared key
desKey=null;
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_LEAVE_CAUSED_DESKEY_TO_BE_NULL);
try {
//generate new shared key
KeyGenerator keyGen=KeyGenerator.getInstance(getAlgorithm(symAlgorithm));
keyGen.init(symInit);
desKey=keyGen.generateKey();
}
catch(Exception e) {
e.printStackTrace();
}
}//end of local_addr == obj
// if I'm not the coordinator/key-server
else {
keyServer=false;
keyServerAddr=(Address)obj;
// reset shared key
desKey=null;
// client send clien's public key to server and request server's public key
newMsg=new Message(keyServerAddr, local_addr, Kpair.getPublic().getEncoded());
// making changes (MANDAR)
newMsg.putHeader(EncryptHeader.KEY, new EncryptHeader(EncryptHeader.KEY_REQUEST));
passDown(new Event(Event.MSG, newMsg));
if(log.isDebugEnabled()) log.debug("Requesting new key to be part of group");
} // end of else
}
break;
case Event.MSG:
msg= (Message) evt.getArg();
if(log.isDebugEnabled()) log.debug("Its a message call " + msg);
int i;
// For Server:
// if some members don't have the shared key yet
if(!notReady.isEmpty())
{
System.out.println("not Ready list :" + notReady.toString());
if(msg.getDest() == null) {
for(i=0; i < notReady.size(); i++) {
// making changes (MANDAR)
newMsg=new Message((Address)notReady.elementAt(i), local_addr, msg.getBuffer());
passDown(new Event(Event.MSG, newMsg));
}
break;
}
else
{
for(i=0; i < notReady.size(); i++) {
if(msg.getDest().equals(notReady.elementAt(i))) {
passDown(evt);
return;
}// end of if..
}// end of for..
}// end of else
}
// I already know the shared key
if(desKey != null)
{
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_DESKEY_IS_NOT_NULL_I_KNOW_IT);
try
{
// if the message is not empty, encrypt it
if(msg.getBuffer() != null)
{
cipher.init(Cipher.ENCRYPT_MODE, desKey);
msg.setBuffer(cipher.doFinal(msg.getBuffer()));
msg.putHeader(EncryptHeader.KEY, new EncryptHeader(0));
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_HAVE_DES_KEY__PACKAGE_SENT);
}
else
{
msg.setBuffer(null);
msg.putHeader(EncryptHeader.KEY, new EncryptHeader(0));
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_BUFFER_NULL_ADDED_HEADER);
}
}catch(Exception e)
{
e.printStackTrace();
}
}
break;
}// check des key..
if(log.isInfoEnabled()) log.info(ExternalStrings.ENCRYPT1_4_PASS_DOWN__0, evt.toString());
passDown(evt); // Pass on to the layer below us
}
private SecretKey decodedKey(byte[] encodedKey) {
SecretKey key=null;
try {
//change needed mandar
SecretKeyFactory KeyFac=SecretKeyFactory.getInstance(getAlgorithm(symAlgorithm));
SecretKeySpec desKeySpec=new SecretKeySpec(encodedKey, getAlgorithm(symAlgorithm));
key=KeyFac.generateSecret(desKeySpec);
}
catch(Exception e) {
e.printStackTrace();
}
return key;
}
private PublicKey generatePubKey(byte[] encodedKey) {
PublicKey tmpPubKey=null;
try {
KeyFactory KeyFac=KeyFactory.getInstance(getAlgorithm(asymAlgorithm));
X509EncodedKeySpec x509KeySpec=new X509EncodedKeySpec(encodedKey);
tmpPubKey=KeyFac.generatePublic(x509KeySpec);
}
catch(Exception e) {
e.printStackTrace();
}
return tmpPubKey;
}
}