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SslContextProviderSupplier.java
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SslContextProviderSupplier.java
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/*
* Copyright 2020 The gRPC Authors
*
* 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 io.grpc.xds.internal.sds;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.MoreObjects;
import io.grpc.xds.EnvoyServerProtoData.BaseTlsContext;
import io.grpc.xds.EnvoyServerProtoData.DownstreamTlsContext;
import io.grpc.xds.EnvoyServerProtoData.UpstreamTlsContext;
import io.grpc.xds.TlsContextManager;
import io.netty.handler.ssl.SslContext;
import java.util.Objects;
/**
* Enables Client or server side to initialize this object with the received {@link BaseTlsContext}
* and communicate it to the consumer i.e. {@link SdsProtocolNegotiators}
* to lazily evaluate the {@link SslContextProvider}. The supplier prevents credentials leakage in
* cases where the user is not using xDS credentials but the client/server contains a non-default
* {@link BaseTlsContext}.
*/
public final class SslContextProviderSupplier implements Closeable {
private final BaseTlsContext tlsContext;
private final TlsContextManager tlsContextManager;
private SslContextProvider sslContextProvider;
private boolean shutdown;
public SslContextProviderSupplier(
BaseTlsContext tlsContext, TlsContextManager tlsContextManager) {
this.tlsContext = checkNotNull(tlsContext, "tlsContext");
this.tlsContextManager = checkNotNull(tlsContextManager, "tlsContextManager");
}
public BaseTlsContext getTlsContext() {
return tlsContext;
}
/** Updates SslContext via the passed callback. */
public synchronized void updateSslContext(final SslContextProvider.Callback callback) {
checkNotNull(callback, "callback");
try {
if (!shutdown) {
if (sslContextProvider == null) {
sslContextProvider = getSslContextProvider();
}
}
// we want to increment the ref-count so call findOrCreate again...
final SslContextProvider toRelease = getSslContextProvider();
toRelease.addCallback(
new SslContextProvider.Callback(callback.getExecutor()) {
@Override
public void updateSecret(SslContext sslContext) {
callback.updateSecret(sslContext);
releaseSslContextProvider(toRelease);
}
@Override
public void onException(Throwable throwable) {
callback.onException(throwable);
releaseSslContextProvider(toRelease);
}
});
} catch (final Throwable throwable) {
callback.getExecutor().execute(new Runnable() {
@Override
public void run() {
callback.onException(throwable);
}
});
}
}
private void releaseSslContextProvider(SslContextProvider toRelease) {
if (tlsContext instanceof UpstreamTlsContext) {
tlsContextManager.releaseClientSslContextProvider(toRelease);
} else {
tlsContextManager.releaseServerSslContextProvider(toRelease);
}
}
private SslContextProvider getSslContextProvider() {
return tlsContext instanceof UpstreamTlsContext
? tlsContextManager.findOrCreateClientSslContextProvider((UpstreamTlsContext) tlsContext)
: tlsContextManager.findOrCreateServerSslContextProvider((DownstreamTlsContext) tlsContext);
}
@VisibleForTesting public boolean isShutdown() {
return shutdown;
}
/** Called by consumer when tlsContext changes. */
@Override
public synchronized void close() {
if (sslContextProvider != null) {
if (tlsContext instanceof UpstreamTlsContext) {
tlsContextManager.releaseClientSslContextProvider(sslContextProvider);
} else {
tlsContextManager.releaseServerSslContextProvider(sslContextProvider);
}
}
sslContextProvider = null;
shutdown = true;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
SslContextProviderSupplier that = (SslContextProviderSupplier) o;
return shutdown == that.shutdown
&& Objects.equals(tlsContext, that.tlsContext)
&& Objects.equals(tlsContextManager, that.tlsContextManager)
&& Objects.equals(sslContextProvider, that.sslContextProvider);
}
@Override
public int hashCode() {
return Objects.hash(tlsContext, tlsContextManager, sslContextProvider, shutdown);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("tlsContext", tlsContext)
.add("tlsContextManager", tlsContextManager)
.add("sslContextProvider", sslContextProvider)
.add("shutdown", shutdown)
.toString();
}
}