ByteArrayGuard class randomly outputs "ERROR: MAC did not verify!" messages to the error console. This only occurs when client side viewstate encryption is enabled and that multiple clients are running against the server.
So you must change that class in your Java Server Faces references with...
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2011 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.faces.renderkit;
import com.sun.faces.util.FacesLogger;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.faces.FacesException;
/**
* This utility class is to provide both encryption and
* decryption Ciphers to ResponseStateManager
* implementations wishing to provide encryption support.
*
* The algorithm used to encrypt byte array is AES with CBC.
*
* Original author Inderjeet Singh, J2EE Blue Prints Team. Modified to suit JSF
* needs.
*/
public final class ByteArrayGuard {
// Log instance for this class
private static final Logger LOGGER = FacesLogger.RENDERKIT.getLogger();
private static final int MAC_LENGTH = 32;
private static final int KEY_LENGTH = 128;
private static final int IV_LENGTH = 16;
private static final String KEY_ALGORITHM = "AES";
private static final String CIPHER_CODE = "AES/CBC/PKCS5Padding";
private static final String MAC_CODE = "HmacSHA256";
private SecretKey sk;
// ------------------------------------------------------------ Constructors
public ByteArrayGuard() {
try {
setupKeyAndMac();
} catch (Exception e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
"Unexpected exception initializing encryption."
+ " No encryption will be performed.",
e);
}
System.err.println("ERROR: Initializing Ciphers");
}
}
// ---------------------------------------------------------- Public Methods
/**
* This method:
* Encrypts bytes using a cipher.
* Generates MAC for intialization vector of the cipher
* Generates MAC for encrypted data
* Returns a byte array consisting of the following concatenated together:
* |MAC for cnrypted Data | MAC for Init Vector | Encrypted Data |
* @param bytes The byte array to be encrypted.
* @return the encrypted byte array.
*/
public byte[] encrypt(byte[] bytes) {
byte[] securedata = null;
try {
// Generate IV
SecureRandom rand = new SecureRandom();
byte[] iv = new byte[16];
rand.nextBytes(iv);
IvParameterSpec ivspec = new IvParameterSpec(iv);
Cipher encryptCipher = Cipher.getInstance(CIPHER_CODE);
encryptCipher.init(Cipher.ENCRYPT_MODE, sk, ivspec);
Mac encryptMac = Mac.getInstance(MAC_CODE);
encryptMac.init(sk);
encryptMac.update(iv);
// encrypt the plaintext
byte[] encdata = encryptCipher.doFinal(bytes);
byte[] macBytes = encryptMac.doFinal(encdata);
byte[] tmp = concatBytes(macBytes, iv);
securedata = concatBytes(tmp, encdata);
} catch (Exception e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
"Unexpected exception initializing encryption."
+ " No encryption will be performed.",
e);
}
return null;
}
return securedata;
}
/**
* This method decrypts the provided byte array.
* The decryption is only performed if the regenerated MAC
* is the same as the MAC for the received value.
* @param bytes Encrypted byte array to be decrypted.
* @return Decrypted byte array.
*/
public byte[] decrypt(byte[] bytes) {
try {
// Extract MAC
byte[] macBytes = new byte[MAC_LENGTH];
System.arraycopy(bytes, 0, macBytes, 0, macBytes.length);
// Extract IV
byte[] iv = new byte[IV_LENGTH];
System.arraycopy(bytes, macBytes.length, iv, 0, iv.length);
// Extract encrypted data
byte[] encdata = new byte[bytes.length - macBytes.length - iv.length];
System.arraycopy(bytes, macBytes.length + iv.length, encdata, 0, encdata.length);
IvParameterSpec ivspec = new IvParameterSpec(iv);
Cipher decryptCipher = Cipher.getInstance(CIPHER_CODE);
decryptCipher.init(Cipher.DECRYPT_MODE, sk, ivspec);
// verify MAC by regenerating it and comparing it with the received value
Mac decryptMac = Mac.getInstance(MAC_CODE);
decryptMac.init(sk);
decryptMac.update(iv);
decryptMac.update(encdata);
byte[] macBytesCalculated = decryptMac.doFinal();
if (Arrays.equals(macBytes, macBytesCalculated)) {
// continue only if the MAC was valid
// System.out.println("Valid MAC found!");
byte[] plaindata = decryptCipher.doFinal(encdata);
return plaindata;
} else {
System.err.println("ERROR: MAC did not verify!");
return null;
}
} catch (Exception e) {
System.err.println("ERROR: Decrypting:"+e.getCause());
return null; // Signal to JSF runtime
}
}
// --------------------------------------------------------- Private Methods
/**
* Generates secret key.
* Initializes MAC(s).
*/
private void setupKeyAndMac() {
try {
KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
kg.init(KEY_LENGTH); // 256 if you're using the Unlimited Policy Files
sk = kg.generateKey();
} catch (Exception e) {
throw new FacesException(e);
}
}
/**
* This method concatenates two byte arrays
* @return a byte array of array1||array2
* @param array1 first byte array to be concatenated
* @param array2 second byte array to be concatenated
*/
private static byte[] concatBytes(byte[] array1, byte[] array2) {
byte[] cBytes = new byte[array1.length + array2.length];
try {
System.arraycopy(array1, 0, cBytes, 0, array1.length);
System.arraycopy(array2, 0, cBytes, array1.length, array2.length);
} catch(Exception e) {
throw new FacesException(e);
}
return cBytes;
}
}
And reload this jar.
JSF_REFERENCE
