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BouncyCastle ALPN support (#11157)

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Motivation:

Under Android it was not possible to load a specific web page. It might be related to the (missing?) ALPN of the internal TLS implementation. BouncyCastle as a replacement works but this was not supported so far by Netty.
BouncyCastle also has the benefit to be a pure Java solution, all the other providers (OpenSSL, Conscrypt) require native libraries which are not available under Android at least.

Modification:

BouncyCastleAlpnSslEngine.java and support classes have been added. It is relying on the JDK code, hence some support classes had to be opened to prevent code duplication.

Result:

BouncyCastle can be used as TLS provider.

Co-authored-by: Norman Maurer <norman_maurer@apple.com>
This commit is contained in:
Karsten Ohme 2021-04-21 16:18:34 +02:00 committed by Norman Maurer
parent 120fb6fcdf
commit d4b9001d1f
5 changed files with 392 additions and 6 deletions
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54
handler/src/main/java/io/netty/handler/ssl/BouncyCastle.java Normal file
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@ -0,0 +1,54 @@
/*
* Copyright 2021 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 javax.net.ssl.SSLEngine;
/**
* Contains methods that can be used to detect if BouncyCastle is usable.
*/
final class BouncyCastle {
private static final boolean BOUNCY_CASTLE_ON_CLASSPATH;
static {
boolean bcOnClasspath = false;
try {
Class.forName("org.bouncycastle.jsse.provider.BouncyCastleJsseProvider");
bcOnClasspath = true;
} catch (Throwable ignore) {
// ignore
}
BOUNCY_CASTLE_ON_CLASSPATH = bcOnClasspath;
}
/**
* Indicates whether or not BouncyCastle is available on the current system.
*/
static boolean isAvailable() {
return BOUNCY_CASTLE_ON_CLASSPATH;
}
/**
* Indicates whether or not BouncyCastle is the underlying SSLEngine.
*/
static boolean isInUse(SSLEngine engine) {
return engine.getClass().getPackage().getName().startsWith("org.bouncycastle.jsse.provider");
}
private BouncyCastle() {
}
}

59
handler/src/main/java/io/netty/handler/ssl/BouncyCastleAlpnSslEngine.java Normal file
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@ -0,0 +1,59 @@
/*
* Copyright 2021 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 javax.net.ssl.SSLEngine;
import java.util.List;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
final class BouncyCastleAlpnSslEngine extends JdkAlpnSslEngine {
BouncyCastleAlpnSslEngine(SSLEngine engine,
@SuppressWarnings("deprecation") JdkApplicationProtocolNegotiator applicationNegotiator,
boolean isServer) {
super(engine, applicationNegotiator, isServer,
new BiConsumer<SSLEngine, AlpnSelector>() {
@Override
public void accept(SSLEngine e, AlpnSelector s) {
BouncyCastleAlpnSslUtils.setHandshakeApplicationProtocolSelector(e, s);
}
},
new BiConsumer<SSLEngine, List<String>>() {
@Override
public void accept(SSLEngine e, List<String> p) {
BouncyCastleAlpnSslUtils.setApplicationProtocols(e, p);
}
});
}
public String getApplicationProtocol() {
return BouncyCastleAlpnSslUtils.getApplicationProtocol(getWrappedEngine());
}
public String getHandshakeApplicationProtocol() {
return BouncyCastleAlpnSslUtils.getHandshakeApplicationProtocol(getWrappedEngine());
}
public void setHandshakeApplicationProtocolSelector(BiFunction<SSLEngine, List<String>, String> selector) {
BouncyCastleAlpnSslUtils.setHandshakeApplicationProtocolSelector(getWrappedEngine(), selector);
}
public BiFunction<SSLEngine, List<String>, String> getHandshakeApplicationProtocolSelector() {
return BouncyCastleAlpnSslUtils.getHandshakeApplicationProtocolSelector(getWrappedEngine());
}
}

249
handler/src/main/java/io/netty/handler/ssl/BouncyCastleAlpnSslUtils.java Normal file
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@ -0,0 +1,249 @@
/*
* Copyright 2021 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.util.internal.EmptyArrays;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLParameters;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.security.AccessController;
import java.security.PrivilegedExceptionAction;
import java.util.List;
import java.util.function.BiFunction;
final class BouncyCastleAlpnSslUtils {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(BouncyCastleAlpnSslUtils.class);
private static final Class BC_SSL_PARAMETERS;
private static final Method SET_PARAMETERS;
private static final Method SET_APPLICATION_PROTOCOLS;
private static final Method GET_APPLICATION_PROTOCOL;
private static final Method GET_HANDSHAKE_APPLICATION_PROTOCOL;
private static final Method SET_HANDSHAKE_APPLICATION_PROTOCOL_SELECTOR;
private static final Method GET_HANDSHAKE_APPLICATION_PROTOCOL_SELECTOR;
private static final Class BC_APPLICATION_PROTOCOL_SELECTOR;
private static final Method BC_APPLICATION_PROTOCOL_SELECTOR_SELECT;
static {
Class bcSslEngine;
Class bcSslParameters;
Method setParameters;
Method setApplicationProtocols;
Method getApplicationProtocol;
Method getHandshakeApplicationProtocol;
Method setHandshakeApplicationProtocolSelector;
Method getHandshakeApplicationProtocolSelector;
Method bcApplicationProtocolSelectorSelect;
Class bcApplicationProtocolSelector;
try {
bcSslEngine = Class.forName("org.bouncycastle.jsse.BCSSLEngine");
final Class testBCSslEngine = bcSslEngine;
bcSslParameters = Class.forName("org.bouncycastle.jsse.BCSSLParameters");
Object bcSslParametersInstance = bcSslParameters.newInstance();
final Class testBCSslParameters = bcSslParameters;
bcApplicationProtocolSelector =
Class.forName("org.bouncycastle.jsse.BCApplicationProtocolSelector");
final Class testBCApplicationProtocolSelector = bcApplicationProtocolSelector;
bcApplicationProtocolSelectorSelect = AccessController.doPrivileged(
new PrivilegedExceptionAction<Method>() {
@Override
public Method run() throws Exception {
return testBCApplicationProtocolSelector.getMethod("select", Object.class, List.class);
}
});
SSLContext context = SSLContext.getInstance("TLSV1.2", "BCJSSE");
context.init(null, null, null);
SSLEngine engine = context.createSSLEngine();
setParameters = AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {
@Override
public Method run() throws Exception {
return testBCSslEngine.getMethod("setParameters", testBCSslParameters);
}
});
setParameters.invoke(engine, bcSslParametersInstance);
setApplicationProtocols = AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {
@Override
public Method run() throws Exception {
return testBCSslParameters.getMethod("setApplicationProtocols", String[].class);
}
});
setApplicationProtocols.invoke(bcSslParametersInstance, new Object[]{EmptyArrays.EMPTY_STRINGS});
getApplicationProtocol = AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {
@Override
public Method run() throws Exception {
return testBCSslEngine.getMethod("getApplicationProtocol");
}
});
getApplicationProtocol.invoke(engine);
getHandshakeApplicationProtocol = AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {
@Override
public Method run() throws Exception {
return testBCSslEngine.getMethod("getHandshakeApplicationProtocol");
}
});
getHandshakeApplicationProtocol.invoke(engine);
setHandshakeApplicationProtocolSelector =
AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {
@Override
public Method run() throws Exception {
return testBCSslEngine.getMethod("setBCHandshakeApplicationProtocolSelector",
testBCApplicationProtocolSelector);
}
});
getHandshakeApplicationProtocolSelector =
AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {
@Override
public Method run() throws Exception {
return testBCSslEngine.getMethod("getBCHandshakeApplicationProtocolSelector");
}
});
getHandshakeApplicationProtocolSelector.invoke(engine);
} catch (Throwable t) {
logger.error("Unable to initialize BouncyCastleAlpnSslUtils.", t);
bcSslParameters = null;
setParameters = null;
setApplicationProtocols = null;
getApplicationProtocol = null;
getHandshakeApplicationProtocol = null;
setHandshakeApplicationProtocolSelector = null;
getHandshakeApplicationProtocolSelector = null;
bcApplicationProtocolSelectorSelect = null;
bcApplicationProtocolSelector = null;
}
BC_SSL_PARAMETERS = bcSslParameters;
SET_PARAMETERS = setParameters;
SET_APPLICATION_PROTOCOLS = setApplicationProtocols;
GET_APPLICATION_PROTOCOL = getApplicationProtocol;
GET_HANDSHAKE_APPLICATION_PROTOCOL = getHandshakeApplicationProtocol;
SET_HANDSHAKE_APPLICATION_PROTOCOL_SELECTOR = setHandshakeApplicationProtocolSelector;
GET_HANDSHAKE_APPLICATION_PROTOCOL_SELECTOR = getHandshakeApplicationProtocolSelector;
BC_APPLICATION_PROTOCOL_SELECTOR_SELECT = bcApplicationProtocolSelectorSelect;
BC_APPLICATION_PROTOCOL_SELECTOR = bcApplicationProtocolSelector;
}
private BouncyCastleAlpnSslUtils() {
}
static String getApplicationProtocol(SSLEngine sslEngine) {
try {
return (String) GET_APPLICATION_PROTOCOL.invoke(sslEngine);
} catch (UnsupportedOperationException ex) {
throw ex;
} catch (Exception ex) {
throw new IllegalStateException(ex);
}
}
static void setApplicationProtocols(SSLEngine engine, List<String> supportedProtocols) {
SSLParameters parameters = engine.getSSLParameters();
String[] protocolArray = supportedProtocols.toArray(EmptyArrays.EMPTY_STRINGS);
try {
Object bcSslParameters = BC_SSL_PARAMETERS.newInstance();
SET_APPLICATION_PROTOCOLS.invoke(bcSslParameters, new Object[]{protocolArray});
SET_PARAMETERS.invoke(engine, bcSslParameters);
} catch (UnsupportedOperationException ex) {
throw ex;
} catch (Exception ex) {
throw new IllegalStateException(ex);
}
engine.setSSLParameters(parameters);
}
static String getHandshakeApplicationProtocol(SSLEngine sslEngine) {
try {
return (String) GET_HANDSHAKE_APPLICATION_PROTOCOL.invoke(sslEngine);
} catch (UnsupportedOperationException ex) {
throw ex;
} catch (Exception ex) {
throw new IllegalStateException(ex);
}
}
static void setHandshakeApplicationProtocolSelector(
SSLEngine engine, final BiFunction<SSLEngine, List<String>, String> selector) {
try {
Object selectorProxyInstance = Proxy.newProxyInstance(
BouncyCastleAlpnSslUtils.class.getClassLoader(),
new Class[]{BC_APPLICATION_PROTOCOL_SELECTOR},
new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getName().equals("select")) {
try {
return selector.apply((SSLEngine) args[0], (List<String>) args[1]);
} catch (ClassCastException e) {
throw new RuntimeException("BCApplicationProtocolSelector select method " +
"parameter of invalid type.", e);
}
} else {
throw new UnsupportedOperationException(String.format("Method '%s' not supported.",
method.getName()));
}
}
});
SET_HANDSHAKE_APPLICATION_PROTOCOL_SELECTOR.invoke(engine, selectorProxyInstance);
} catch (UnsupportedOperationException ex) {
throw ex;
} catch (Exception ex) {
throw new IllegalStateException(ex);
}
}
@SuppressWarnings("unchecked")
static BiFunction<SSLEngine, List<String>, String> getHandshakeApplicationProtocolSelector(SSLEngine engine) {
try {
final Object selector = GET_HANDSHAKE_APPLICATION_PROTOCOL_SELECTOR.invoke(engine);
return new BiFunction<SSLEngine, List<String>, String>() {
@Override
public String apply(SSLEngine sslEngine, List<String> strings) {
try {
return (String) BC_APPLICATION_PROTOCOL_SELECTOR_SELECT.invoke(selector, sslEngine,
strings);
} catch (Exception e) {
throw new RuntimeException("Could not call getHandshakeApplicationProtocolSelector", e);
}
}
};
} catch (UnsupportedOperationException ex) {
throw ex;
} catch (Exception ex) {
throw new IllegalStateException(ex);
}
}
}

6
handler/src/main/java/io/netty/handler/ssl/JdkAlpnApplicationProtocolNegotiator.java
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@ -28,7 +28,8 @@ import javax.net.ssl.SSLEngine;
public final class JdkAlpnApplicationProtocolNegotiator extends JdkBaseApplicationProtocolNegotiator {
private static final boolean AVAILABLE = Conscrypt.isAvailable() ||
JdkAlpnSslUtils.supportsAlpn() ||
JettyAlpnSslEngine.isAvailable();
JettyAlpnSslEngine.isAvailable() ||
BouncyCastle.isAvailable();
private static final SslEngineWrapperFactory ALPN_WRAPPER = AVAILABLE ? new AlpnWrapper() : new FailureWrapper();
@ -133,6 +134,9 @@ public final class JdkAlpnApplicationProtocolNegotiator extends JdkBaseApplicati
return isServer ? ConscryptAlpnSslEngine.newServerEngine(engine, alloc, applicationNegotiator)
: ConscryptAlpnSslEngine.newClientEngine(engine, alloc, applicationNegotiator);
}
if (BouncyCastle.isInUse(engine)) {
return new BouncyCastleAlpnSslEngine(engine, applicationNegotiator, isServer);
}
// ALPN support was recently backported to Java8 as
// https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8230977.
// Because of this lets not do a Java version runtime check but just depend on if the required methods are

30
handler/src/main/java/io/netty/handler/ssl/JdkAlpnSslEngine.java
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@ -24,17 +24,18 @@ import javax.net.ssl.SSLException;
import java.nio.ByteBuffer;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import static io.netty.handler.ssl.SslUtils.toSSLHandshakeException;
import static io.netty.handler.ssl.JdkApplicationProtocolNegotiator.ProtocolSelectionListener;
import static io.netty.handler.ssl.JdkApplicationProtocolNegotiator.ProtocolSelector;
final class JdkAlpnSslEngine extends JdkSslEngine {
class JdkAlpnSslEngine extends JdkSslEngine {
private final ProtocolSelectionListener selectionListener;
private final AlpnSelector alpnSelector;
private final class AlpnSelector implements BiFunction<SSLEngine, List<String>, String> {
final class AlpnSelector implements BiFunction<SSLEngine, List<String>, String> {
private final ProtocolSelector selector;
private boolean called;
@ -79,21 +80,40 @@ final class JdkAlpnSslEngine extends JdkSslEngine {
JdkAlpnSslEngine(SSLEngine engine,
@SuppressWarnings("deprecation") JdkApplicationProtocolNegotiator applicationNegotiator,
boolean isServer) {
boolean isServer, BiConsumer<SSLEngine, AlpnSelector> setHandshakeApplicationProtocolSelector,
BiConsumer<SSLEngine, List<String>> setApplicationProtocols) {
super(engine);
if (isServer) {
selectionListener = null;
alpnSelector = new AlpnSelector(applicationNegotiator.protocolSelectorFactory().
newSelector(this, new LinkedHashSet<>(applicationNegotiator.protocols())));
JdkAlpnSslUtils.setHandshakeApplicationProtocolSelector(engine, alpnSelector);
setHandshakeApplicationProtocolSelector.accept(engine, alpnSelector);
} else {
selectionListener = applicationNegotiator.protocolListenerFactory()
.newListener(this, applicationNegotiator.protocols());
alpnSelector = null;
JdkAlpnSslUtils.setApplicationProtocols(engine, applicationNegotiator.protocols());
setApplicationProtocols.accept(engine, applicationNegotiator.protocols());
}
}
JdkAlpnSslEngine(SSLEngine engine,
@SuppressWarnings("deprecation") JdkApplicationProtocolNegotiator applicationNegotiator,
boolean isServer) {
this(engine, applicationNegotiator, isServer,
new BiConsumer<SSLEngine, AlpnSelector>() {
@Override
public void accept(SSLEngine e, AlpnSelector s) {
JdkAlpnSslUtils.setHandshakeApplicationProtocolSelector(e, s);
}
},
new BiConsumer<SSLEngine, List<String>>() {
@Override
public void accept(SSLEngine e, List<String> p) {
JdkAlpnSslUtils.setApplicationProtocols(e, p);
}
});
}
private SSLEngineResult verifyProtocolSelection(SSLEngineResult result) throws SSLException {
if (result.getHandshakeStatus() == SSLEngineResult.HandshakeStatus.FINISHED) {
if (alpnSelector == null) {