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/*
* JBoss, Home of Professional Open Source.
* Copyright 2016 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wildfly.security.http.digest;
import java.nio.ByteBuffer;
import java.security.DigestException;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.wildfly.common.iteration.ByteIterator;
import org.wildfly.common.iteration.CodePointIterator;
import org.wildfly.security.mechanism._private.ElytronMessages;
import org.wildfly.security.mechanism.AuthenticationMechanismException;
/**
* A utility responsible for managing nonces.
*
* @author Darran Lofthouse
*/
public class NonceManager {
private static final int PREFIX_LENGTH = Integer.BYTES + Long.BYTES;
private final ScheduledExecutorService executor;
private final AtomicInteger nonceCounter = new AtomicInteger();
private final Map usedNonces = new HashMap<>();
private final byte[] privateKey;
private final long validityPeriodNano;
private final long nonceSessionTime;
private final boolean singleUse;
private final String algorithm;
private ElytronMessages log;
/**
* @param validityPeriod the time in ms that nonces are valid for in ms.
* @param nonceSessionTime the time in ms a nonce is usable for after it's last use where nonce counts are in use.
* @param singleUse are nonces single use?
* @param keySize the number of bytes to use in the private key of this node.
* @param algorithm the message digest algorithm to use when creating the digest portion of the nonce.
*/
@Deprecated
NonceManager(long validityPeriod, long nonceSessionTime, boolean singleUse, int keySize, String algorithm) {
this.validityPeriodNano = validityPeriod * 1000000;
this.nonceSessionTime = nonceSessionTime;
this.singleUse = singleUse;
this.algorithm = algorithm;
this.log = ElytronMessages.log;
this.privateKey = new byte[keySize];
new SecureRandom().nextBytes(privateKey);
ScheduledThreadPoolExecutor INSTANCE = new ScheduledThreadPoolExecutor(1);
INSTANCE.setRemoveOnCancelPolicy(true);
INSTANCE.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
executor = INSTANCE;
}
/**
* @param validityPeriod the time in ms that nonces are valid for in ms.
* @param nonceSessionTime the time in ms a nonce is usable for after it's last use where nonce counts are in use.
* @param singleUse are nonces single use?
* @param keySize the number of bytes to use in the private key of this node.
* @param algorithm the message digest algorithm to use when creating the digest portion of the nonce.
* @param log mechanism specific logger.
*/
NonceManager(long validityPeriod, long nonceSessionTime, boolean singleUse, int keySize, String algorithm, ElytronMessages log) {
this.validityPeriodNano = validityPeriod * 1000000;
this.nonceSessionTime = nonceSessionTime;
this.singleUse = singleUse;
this.algorithm = algorithm;
this.log = log;
this.privateKey = new byte[keySize];
new SecureRandom().nextBytes(privateKey);
ScheduledThreadPoolExecutor INSTANCE = new ScheduledThreadPoolExecutor(1);
INSTANCE.setRemoveOnCancelPolicy(true);
INSTANCE.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
executor = INSTANCE;
}
/**
* @param validityPeriod the time in ms that nonces are valid for in ms.
* @param nonceSessionTime the time in ms a nonce is usable for after it's last use where nonce counts are in use.
* @param singleUse are nonces single use?
* @param keySize the number of bytes to use in the private key of this node.
* @param algorithm the message digest algorithm to use when creating the digest portion of the nonce.
* @param log mechanism specific logger.
* @param customExecutor a custom ScheduledExecutorService to be used
*/
NonceManager(long validityPeriod, long nonceSessionTime, boolean singleUse, int keySize, String algorithm, ElytronMessages log, ScheduledExecutorService customExecutor) {
this.validityPeriodNano = validityPeriod * 1000000;
this.nonceSessionTime = nonceSessionTime;
this.singleUse = singleUse;
this.algorithm = algorithm;
this.log = log;
this.privateKey = new byte[keySize];
new SecureRandom().nextBytes(privateKey);
if (customExecutor == null) {
ScheduledThreadPoolExecutor INSTANCE = new ScheduledThreadPoolExecutor(1);
INSTANCE.setRemoveOnCancelPolicy(true);
INSTANCE.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
executor = INSTANCE;
}
else {
executor = customExecutor;
}
}
/**
* Generate a new encoded nonce to send to the client.
*
* @return a new encoded nonce to send to the client.
*/
String generateNonce() {
return generateNonce(null);
}
/**
* Generate a new encoded nonce to send to the client.
*
* @param salt additional data to use when creating the overall signature for the nonce.
* @return a new encoded nonce to send to the client.
*/
String generateNonce(byte[] salt) {
try {
MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
ByteBuffer byteBuffer = ByteBuffer.allocate(PREFIX_LENGTH + messageDigest.getDigestLength());
byteBuffer.putInt(nonceCounter.incrementAndGet());
byteBuffer.putLong(System.nanoTime());
byteBuffer.put(digest(byteBuffer.array(), 0, PREFIX_LENGTH, salt, messageDigest));
String nonce = ByteIterator.ofBytes(byteBuffer.array()).base64Encode().drainToString();
if (log.isTraceEnabled()) {
String saltString = salt == null ? "null" : ByteIterator.ofBytes(salt).hexEncode().drainToString();
log.tracef("New nonce generated %s, using seed %s", nonce, saltString);
}
return nonce;
} catch (GeneralSecurityException e) {
throw new IllegalStateException(e);
}
}
private byte[] digest(byte[] prefix, int prefixOffset, int prefixLength, byte[] salt, MessageDigest messageDigest) throws DigestException {
messageDigest.update(prefix, prefixOffset, prefixLength);
if (salt != null) {
messageDigest.update(salt);
}
return messageDigest.digest(privateKey);
}
/**
* Attempt to use the supplied nonce.
*
* A nonce might not be usable for a couple of different reasons: -
*
*
*
It was created too far in the past.
*
Validation of the signature fails.
*
The nonce has been used previously and re-use is disabled.
*
*
* @param nonce the nonce supplied by the client.
* @param nonceCount the nonce count, or -1 if not present
* @return {@code true} if the nonce can be used, {@code false} otherwise.
* @throws AuthenticationMechanismException
*/
boolean useNonce(String nonce, int nonceCount) throws AuthenticationMechanismException {
return useNonce(nonce, null, nonceCount);
}
/**
* Attempt to use the supplied nonce.
*
* A nonce might not be usable for a couple of different reasons: -
*
*
*
It was created too far in the past.
*
Validation of the signature fails.
*
The nonce has been used previously and re-use is disabled.
*
*
* @param nonce the nonce supplied by the client.
* @param salt additional data to use when creating the overall signature for the nonce.
* @return {@code true} if the nonce can be used, {@code false} otherwise.
* @throws AuthenticationMechanismException
*/
boolean useNonce(final String nonce, byte[] salt, int nonceCount) throws AuthenticationMechanismException {
try {
MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
ByteIterator byteIterator = CodePointIterator.ofChars(nonce.toCharArray()).base64Decode();
byte[] nonceBytes = byteIterator.drain();
if (nonceBytes.length != PREFIX_LENGTH + messageDigest.getDigestLength()) {
throw log.invalidNonceLength();
}
byte[] nonceBytesWithoutPrefix = Arrays.copyOfRange(nonceBytes, PREFIX_LENGTH, nonceBytes.length);
byte[] expectedNonce = digest(nonceBytes, 0, PREFIX_LENGTH, salt, messageDigest);
if (MessageDigest.isEqual(nonceBytesWithoutPrefix, expectedNonce) == false) {
if (log.isTraceEnabled()) {
String saltString = salt == null ? "null" : ByteIterator.ofBytes(salt).hexEncode().drainToString();
log.tracef("Nonce %s rejected due to failed comparison using secret key with seed %s.", nonce,
saltString);
}
return false;
}
long age = System.nanoTime() - ByteBuffer.wrap(nonceBytes, Integer.BYTES, Long.BYTES).getLong();
if(nonceCount > 0) {
synchronized (usedNonces) {
NonceState nonceState = usedNonces.get(nonce);
if (nonceState != null && nonceState.highestNonceCount < 0) {
log.tracef("Nonce %s rejected due to previously being used without a nonce count", nonce);
return false;
} else if (nonceState != null) {
if (nonceCount > nonceState.highestNonceCount) {
if (nonceState.futureCleanup.cancel(true)) {
nonceState.highestNonceCount = nonceCount;
} else {
log.tracef("Nonce %s rejected as unable to cancel clean up, likely at expiration time", nonce);
return false;
}
} else {
log.tracef("Nonce %s rejected due to highest seen nonce count %d being equal to or higher than the nonce count received %d",
nonce, nonceState.highestNonceCount, nonceCount);
return false;
}
} else {
if (age < 0 || age > validityPeriodNano) {
log.tracef("Nonce %s rejected due to age %d (ns) being less than 0 or greater than the validity period %d (ns)",
nonce, age, validityPeriodNano);
return false;
}
nonceState = new NonceState();
nonceState.highestNonceCount = nonceCount;
usedNonces.put(nonce, nonceState);
if (log.isTraceEnabled()) {
log.tracef("Currently %d nonces being tracked", usedNonces.size());
}
}
nonceState.futureCleanup = executor.schedule(() -> {
synchronized (usedNonces) {
usedNonces.remove(nonce);
}
}, nonceSessionTime, TimeUnit.MILLISECONDS);
}
} else {
if (age < 0 || age > validityPeriodNano) {
log.tracef("Nonce %s rejected due to age %d (ns) being less than 0 or greater than the validity period %d (ns)", nonce, age, validityPeriodNano);
return false;
}
if (singleUse) {
synchronized(usedNonces) {
NonceState nonceState = usedNonces.get(nonce);
if (nonceState != null) {
log.tracef("Nonce %s rejected due to previously being used", nonce);
return false;
} else {
nonceState = new NonceState();
usedNonces.put(nonce, nonceState);
if (log.isTraceEnabled()) {
log.tracef("Currently %d nonces being tracked", usedNonces.size());
}
executor.schedule(() -> {
synchronized(usedNonces) {
usedNonces.remove(nonce);
}
}, validityPeriodNano - age, TimeUnit.NANOSECONDS);
}
}
}
}
return true;
} catch (GeneralSecurityException e) {
throw new IllegalStateException(e);
}
}
public void shutdown() {
if (executor != null) { executor.shutdown(); }
}
private static class NonceState {
private ScheduledFuture futureCleanup;
private int highestNonceCount = -1;
}
}
