ReferenceCountedOpenSslClientContext.java
/*
* Copyright 2016 The Netty Project
*
* The Netty Project 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:
*
* https://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 io.netty.handler.ssl;
import io.netty.internal.tcnative.CertificateCallback;
import io.netty.util.internal.EmptyArrays;
import io.netty.util.internal.SuppressJava6Requirement;
import io.netty.internal.tcnative.SSL;
import io.netty.internal.tcnative.SSLContext;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLException;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509ExtendedTrustManager;
import javax.net.ssl.X509TrustManager;
import javax.security.auth.x500.X500Principal;
/**
* A client-side {@link SslContext} which uses OpenSSL's SSL/TLS implementation.
* <p>Instances of this class must be {@link #release() released} or else native memory will leak!
*
* <p>Instances of this class <strong>must not</strong> be released before any {@link ReferenceCountedOpenSslEngine}
* which depends upon the instance of this class is released. Otherwise if any method of
* {@link ReferenceCountedOpenSslEngine} is called which uses this class's JNI resources the JVM may crash.
*/
public final class ReferenceCountedOpenSslClientContext extends ReferenceCountedOpenSslContext {
private static final Set<String> SUPPORTED_KEY_TYPES = Collections.unmodifiableSet(new LinkedHashSet<String>(
Arrays.asList(OpenSslKeyMaterialManager.KEY_TYPE_RSA,
OpenSslKeyMaterialManager.KEY_TYPE_DH_RSA,
OpenSslKeyMaterialManager.KEY_TYPE_EC,
OpenSslKeyMaterialManager.KEY_TYPE_EC_RSA,
OpenSslKeyMaterialManager.KEY_TYPE_EC_EC)));
private final OpenSslSessionContext sessionContext;
ReferenceCountedOpenSslClientContext(X509Certificate[] trustCertCollection, TrustManagerFactory trustManagerFactory,
X509Certificate[] keyCertChain, PrivateKey key, String keyPassword,
KeyManagerFactory keyManagerFactory, Iterable<String> ciphers,
CipherSuiteFilter cipherFilter, ApplicationProtocolConfig apn,
String[] protocols, long sessionCacheSize, long sessionTimeout,
boolean enableOcsp, String keyStore,
Map.Entry<SslContextOption<?>, Object>... options) throws SSLException {
super(ciphers, cipherFilter, toNegotiator(apn), SSL.SSL_MODE_CLIENT, keyCertChain,
ClientAuth.NONE, protocols, false, enableOcsp, true, options);
boolean success = false;
try {
sessionContext = newSessionContext(this, ctx, engineMap, trustCertCollection, trustManagerFactory,
keyCertChain, key, keyPassword, keyManagerFactory, keyStore,
sessionCacheSize, sessionTimeout);
success = true;
} finally {
if (!success) {
release();
}
}
}
@Override
public OpenSslSessionContext sessionContext() {
return sessionContext;
}
static OpenSslSessionContext newSessionContext(ReferenceCountedOpenSslContext thiz, long ctx,
OpenSslEngineMap engineMap,
X509Certificate[] trustCertCollection,
TrustManagerFactory trustManagerFactory,
X509Certificate[] keyCertChain, PrivateKey key,
String keyPassword, KeyManagerFactory keyManagerFactory,
String keyStore, long sessionCacheSize, long sessionTimeout)
throws SSLException {
if (key == null && keyCertChain != null || key != null && keyCertChain == null) {
throw new IllegalArgumentException(
"Either both keyCertChain and key needs to be null or none of them");
}
OpenSslKeyMaterialProvider keyMaterialProvider = null;
try {
try {
if (!OpenSsl.useKeyManagerFactory()) {
if (keyManagerFactory != null) {
throw new IllegalArgumentException(
"KeyManagerFactory not supported");
}
if (keyCertChain != null/* && key != null*/) {
setKeyMaterial(ctx, keyCertChain, key, keyPassword);
}
} else {
// javadocs state that keyManagerFactory has precedent over keyCertChain
if (keyManagerFactory == null && keyCertChain != null) {
char[] keyPasswordChars = keyStorePassword(keyPassword);
KeyStore ks = buildKeyStore(keyCertChain, key, keyPasswordChars, keyStore);
if (ks.aliases().hasMoreElements()) {
keyManagerFactory = new OpenSslX509KeyManagerFactory();
} else {
keyManagerFactory = new OpenSslCachingX509KeyManagerFactory(
KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm()));
}
keyManagerFactory.init(ks, keyPasswordChars);
keyMaterialProvider = providerFor(keyManagerFactory, keyPassword);
} else if (keyManagerFactory != null) {
keyMaterialProvider = providerFor(keyManagerFactory, keyPassword);
}
if (keyMaterialProvider != null) {
OpenSslKeyMaterialManager materialManager = new OpenSslKeyMaterialManager(keyMaterialProvider);
SSLContext.setCertificateCallback(ctx, new OpenSslClientCertificateCallback(
engineMap, materialManager));
}
}
} catch (Exception e) {
throw new SSLException("failed to set certificate and key", e);
}
// On the client side we always need to use SSL_CVERIFY_OPTIONAL (which will translate to SSL_VERIFY_PEER)
// to ensure that when the TrustManager throws we will produce the correct alert back to the server.
//
// See:
// - https://www.openssl.org/docs/man1.0.2/man3/SSL_CTX_set_verify.html
// - https://github.com/netty/netty/issues/8942
SSLContext.setVerify(ctx, SSL.SSL_CVERIFY_OPTIONAL, VERIFY_DEPTH);
try {
if (trustCertCollection != null) {
trustManagerFactory = buildTrustManagerFactory(trustCertCollection, trustManagerFactory, keyStore);
} else if (trustManagerFactory == null) {
trustManagerFactory = TrustManagerFactory.getInstance(
TrustManagerFactory.getDefaultAlgorithm());
trustManagerFactory.init((KeyStore) null);
}
final X509TrustManager manager = chooseTrustManager(trustManagerFactory.getTrustManagers());
// IMPORTANT: The callbacks set for verification must be static to prevent memory leak as
// otherwise the context can never be collected. This is because the JNI code holds
// a global reference to the callbacks.
//
// See https://github.com/netty/netty/issues/5372
setVerifyCallback(ctx, engineMap, manager);
} catch (Exception e) {
if (keyMaterialProvider != null) {
keyMaterialProvider.destroy();
}
throw new SSLException("unable to setup trustmanager", e);
}
OpenSslClientSessionContext context = new OpenSslClientSessionContext(thiz, keyMaterialProvider);
context.setSessionCacheEnabled(CLIENT_ENABLE_SESSION_CACHE);
if (sessionCacheSize > 0) {
context.setSessionCacheSize((int) Math.min(sessionCacheSize, Integer.MAX_VALUE));
}
if (sessionTimeout > 0) {
context.setSessionTimeout((int) Math.min(sessionTimeout, Integer.MAX_VALUE));
}
if (CLIENT_ENABLE_SESSION_TICKET) {
context.setTicketKeys();
}
keyMaterialProvider = null;
return context;
} finally {
if (keyMaterialProvider != null) {
keyMaterialProvider.destroy();
}
}
}
@SuppressJava6Requirement(reason = "Guarded by java version check")
private static void setVerifyCallback(long ctx, OpenSslEngineMap engineMap, X509TrustManager manager) {
// Use this to prevent an error when running on java < 7
if (useExtendedTrustManager(manager)) {
SSLContext.setCertVerifyCallback(ctx,
new ExtendedTrustManagerVerifyCallback(engineMap, (X509ExtendedTrustManager) manager));
} else {
SSLContext.setCertVerifyCallback(ctx, new TrustManagerVerifyCallback(engineMap, manager));
}
}
static final class OpenSslClientSessionContext extends OpenSslSessionContext {
OpenSslClientSessionContext(ReferenceCountedOpenSslContext context, OpenSslKeyMaterialProvider provider) {
super(context, provider, SSL.SSL_SESS_CACHE_CLIENT, new OpenSslClientSessionCache(context.engineMap));
}
}
private static final class TrustManagerVerifyCallback extends AbstractCertificateVerifier {
private final X509TrustManager manager;
TrustManagerVerifyCallback(OpenSslEngineMap engineMap, X509TrustManager manager) {
super(engineMap);
this.manager = manager;
}
@Override
void verify(ReferenceCountedOpenSslEngine engine, X509Certificate[] peerCerts, String auth)
throws Exception {
manager.checkServerTrusted(peerCerts, auth);
}
}
@SuppressJava6Requirement(reason = "Usage guarded by java version check")
private static final class ExtendedTrustManagerVerifyCallback extends AbstractCertificateVerifier {
private final X509ExtendedTrustManager manager;
ExtendedTrustManagerVerifyCallback(OpenSslEngineMap engineMap, X509ExtendedTrustManager manager) {
super(engineMap);
this.manager = manager;
}
@Override
void verify(ReferenceCountedOpenSslEngine engine, X509Certificate[] peerCerts, String auth)
throws Exception {
manager.checkServerTrusted(peerCerts, auth, engine);
}
}
private static final class OpenSslClientCertificateCallback implements CertificateCallback {
private final OpenSslEngineMap engineMap;
private final OpenSslKeyMaterialManager keyManagerHolder;
OpenSslClientCertificateCallback(OpenSslEngineMap engineMap, OpenSslKeyMaterialManager keyManagerHolder) {
this.engineMap = engineMap;
this.keyManagerHolder = keyManagerHolder;
}
@Override
public void handle(long ssl, byte[] keyTypeBytes, byte[][] asn1DerEncodedPrincipals) throws Exception {
final ReferenceCountedOpenSslEngine engine = engineMap.get(ssl);
// May be null if it was destroyed in the meantime.
if (engine == null) {
return;
}
try {
final Set<String> keyTypesSet = supportedClientKeyTypes(keyTypeBytes);
final String[] keyTypes = keyTypesSet.toArray(EmptyArrays.EMPTY_STRINGS);
final X500Principal[] issuers;
if (asn1DerEncodedPrincipals == null) {
issuers = null;
} else {
issuers = new X500Principal[asn1DerEncodedPrincipals.length];
for (int i = 0; i < asn1DerEncodedPrincipals.length; i++) {
issuers[i] = new X500Principal(asn1DerEncodedPrincipals[i]);
}
}
keyManagerHolder.setKeyMaterialClientSide(engine, keyTypes, issuers);
} catch (Throwable cause) {
engine.initHandshakeException(cause);
if (cause instanceof Exception) {
throw (Exception) cause;
}
throw new SSLException(cause);
}
}
/**
* Gets the supported key types for client certificates.
*
* @param clientCertificateTypes {@code ClientCertificateType} values provided by the server.
* See https://www.ietf.org/assignments/tls-parameters/tls-parameters.xml.
* @return supported key types that can be used in {@code X509KeyManager.chooseClientAlias} and
* {@code X509ExtendedKeyManager.chooseEngineClientAlias}.
*/
private static Set<String> supportedClientKeyTypes(byte[] clientCertificateTypes) {
if (clientCertificateTypes == null) {
// Try all of the supported key types.
return SUPPORTED_KEY_TYPES;
}
Set<String> result = new HashSet<String>(clientCertificateTypes.length);
for (byte keyTypeCode : clientCertificateTypes) {
String keyType = clientKeyType(keyTypeCode);
if (keyType == null) {
// Unsupported client key type -- ignore
continue;
}
result.add(keyType);
}
return result;
}
private static String clientKeyType(byte clientCertificateType) {
// See also https://www.ietf.org/assignments/tls-parameters/tls-parameters.xml
switch (clientCertificateType) {
case CertificateCallback.TLS_CT_RSA_SIGN:
return OpenSslKeyMaterialManager.KEY_TYPE_RSA; // RFC rsa_sign
case CertificateCallback.TLS_CT_RSA_FIXED_DH:
return OpenSslKeyMaterialManager.KEY_TYPE_DH_RSA; // RFC rsa_fixed_dh
case CertificateCallback.TLS_CT_ECDSA_SIGN:
return OpenSslKeyMaterialManager.KEY_TYPE_EC; // RFC ecdsa_sign
case CertificateCallback.TLS_CT_RSA_FIXED_ECDH:
return OpenSslKeyMaterialManager.KEY_TYPE_EC_RSA; // RFC rsa_fixed_ecdh
case CertificateCallback.TLS_CT_ECDSA_FIXED_ECDH:
return OpenSslKeyMaterialManager.KEY_TYPE_EC_EC; // RFC ecdsa_fixed_ecdh
default:
return null;
}
}
}
}