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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.openssl;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import org.wildfly.openssl.util.ConcurrentDirectDeque;
/**
* {@link OpenSSLSessionContext} implementation which offers extra methods which
* are only useful for the client-side.
*/
public final class OpenSSLClientSessionContext extends OpenSSLSessionContext {
private final Map cache;
private final ConcurrentDirectDeque accessQueue;
/**
* The session timeout in seconds
*/
private volatile int timeout;
private final long context;
private int maxCacheSize = 100;
private volatile boolean enabled;
OpenSSLClientSessionContext(long context) {
super(context);
this.context = context;
cache = new ConcurrentHashMap<>();
accessQueue = ConcurrentDirectDeque.newInstance();
}
@Override
public void setSessionTimeout(int seconds) {
if (seconds < 0) {
throw new IllegalArgumentException();
}
this.timeout = seconds;
}
@Override
public int getSessionTimeout() {
return timeout;
}
@Override
public void setSessionCacheSize(int size) {
this.maxCacheSize = size;
purgeOld();
}
@Override
void remove(byte[] session) {
super.remove(session);
}
@Override
public int getSessionCacheSize() {
return maxCacheSize;
}
synchronized void storeClientSideSession(final long ssl, final String host, final int port, byte[] sessionId) {
if (host != null && port >= 0) {
final ClientSessionKey key = new ClientSessionKey(host, port);
// set with the session pointer from the found session
final ClientSessionInfo foundSessionPtr = getCacheValue(key);
if (foundSessionPtr != null) {
if(getSession(foundSessionPtr.sessionId) != null) {
removeCacheEntry(key);
} else {
removeCacheEntry(key);
}
}
final long sessionPointer = SSL.getInstance().getSession(ssl);
addCacheEntry(key, new ClientSessionInfo(sessionPointer, sessionId, System.currentTimeMillis()));
clientSessionCreated(ssl, sessionPointer, sessionId);
}
}
void tryAttachClientSideSession(final long ssl, final String host, final int port) {
if (host != null && port >= 0) {
final ClientSessionKey key = new ClientSessionKey(host, port);
// set with the session pointer from the found session
final ClientSessionInfo foundSessionPtr = getCacheValue(key);
if (foundSessionPtr != null) {
final OpenSSlSession existingSession = getOpenSSlSession(foundSessionPtr.sessionId);
if(existingSession == null) {
removeCacheEntry(key);
} else {
synchronized (existingSession) {
if (existingSession.isValid()) {
SSL.getInstance().setSession(ssl, foundSessionPtr.session);
}
}
}
}
}
}
private void purgeOld() {
if (maxCacheSize > 0) {
final int removeSize = (cache.size() - maxCacheSize);
if (removeSize > 0) {
// Remove each entry until there are either no more entries or the size matches
for (int i = 0; i < removeSize; i++) {
final CacheEntry oldest = accessQueue.poll();
if (oldest != null) {
removeCacheEntry(oldest.key());
} else {
// No need to continue as there are no more entries
break;
}
}
}
}
}
private void addCacheEntry(final ClientSessionKey key, final ClientSessionInfo newValue) {
CacheEntry value = cache.get(key);
if (value == null) {
value = new CacheEntry(key, newValue);
final CacheEntry result = cache.putIfAbsent(key, value);
if (result != null) {
value = result;
value.setValue(newValue);
}
bumpAccess(value);
if (maxCacheSize > 0 && cache.size() > maxCacheSize) {
// Remove the oldest entry
final CacheEntry oldest = accessQueue.poll();
if (oldest != value) {
removeCacheEntry(oldest.key());
}
}
}
}
private ClientSessionInfo getCacheValue(final ClientSessionKey key) {
CacheEntry cacheEntry = cache.get(key);
if (cacheEntry == null) {
return null;
}
if (timeout > 0) {
long expires = cacheEntry.getTime() + (timeout * 1000);
if (System.currentTimeMillis() > expires) {
removeCacheEntry(key);
return null;
}
}
if (cacheEntry.hit() % 5 == 0) {
bumpAccess(cacheEntry);
}
return cacheEntry.getValue();
}
private ClientSessionInfo removeCacheEntry(final ClientSessionKey key) {
CacheEntry remove = cache.remove(key);
if (remove != null) {
Object old = remove.clearToken();
if (old != null) {
accessQueue.removeToken(old);
}
final ClientSessionInfo result = remove.getValue();
if (result != null) {
invalidateIfPresent(result.sessionId);
}
return result;
} else {
return null;
}
}
private void bumpAccess(final CacheEntry cacheEntry) {
final Object prevToken = cacheEntry.claimToken();
if (prevToken != Boolean.FALSE) {
if (prevToken != null) {
accessQueue.removeToken(prevToken);
}
Object token = null;
try {
token = accessQueue.offerLastAndReturnToken(cacheEntry);
} catch (Throwable t) {
// In case of disaster (OOME), we need to release the claim, so leave it as null
}
if (!cacheEntry.setToken(token) && token != null) { // Always set if null
accessQueue.removeToken(token);
}
}
}
private static class ClientSessionKey {
private final String host;
private final int port;
private ClientSessionKey(final String host, final int port) {
this.host = host;
this.port = port;
}
@Override
public int hashCode() {
int result = 17;
result = 31 * result + (host == null ? 0 : host.hashCode());
result = 31 * result + port;
return result;
}
@Override
public boolean equals(final Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof ClientSessionKey)) {
return false;
}
final ClientSessionKey other = (ClientSessionKey) obj;
return Objects.equals(host, other.host) && port == other.port;
}
}
private static final class ClientSessionInfo {
final long session;
final byte[] sessionId;
final long time;
private ClientSessionInfo(long session, byte[] sessionId, final long time) {
this.session = session;
this.sessionId = sessionId;
this.time = time;
}
}
private static final class CacheEntry {
private static final Object CLAIM_TOKEN = new Object();
private static final AtomicIntegerFieldUpdater hitsUpdater = AtomicIntegerFieldUpdater.newUpdater(CacheEntry.class, "hits");
private static final AtomicReferenceFieldUpdater tokenUpdater = AtomicReferenceFieldUpdater.newUpdater(CacheEntry.class, Object.class, "accessToken");
private final ClientSessionKey key;
private volatile ClientSessionInfo value;
private volatile int hits = 1;
private volatile Object accessToken;
private CacheEntry(ClientSessionKey key, ClientSessionInfo value) {
this.key = key;
this.value = value;
}
void setValue(final ClientSessionInfo value) {
this.value = value;
}
ClientSessionInfo getValue() {
return value;
}
int hit() {
for (; ; ) {
int i = hits;
if (hitsUpdater.weakCompareAndSet(this, i, ++i)) {
return i;
}
}
}
ClientSessionKey key() {
return key;
}
Object claimToken() {
for (; ; ) {
Object current = this.accessToken;
if (current == CLAIM_TOKEN) {
return Boolean.FALSE;
}
if (tokenUpdater.compareAndSet(this, current, CLAIM_TOKEN)) {
return current;
}
}
}
boolean setToken(Object token) {
return tokenUpdater.compareAndSet(this, CLAIM_TOKEN, token);
}
Object clearToken() {
Object old = tokenUpdater.getAndSet(this, null);
return old == CLAIM_TOKEN ? null : old;
}
long getTime() {
return value.time;
}
}
}
