forked from grpc/grpc-java
/
AltsChannelCredentials.java
159 lines (136 loc) · 5.29 KB
/
AltsChannelCredentials.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.alts;
import com.google.common.collect.ImmutableList;
import io.grpc.Channel;
import io.grpc.ChannelCredentials;
import io.grpc.ExperimentalApi;
import io.grpc.Status;
import io.grpc.alts.internal.AltsProtocolNegotiator.ClientAltsProtocolNegotiatorFactory;
import io.grpc.internal.ObjectPool;
import io.grpc.internal.SharedResourcePool;
import io.grpc.netty.GrpcHttp2ConnectionHandler;
import io.grpc.netty.InternalNettyChannelCredentials;
import io.grpc.netty.InternalProtocolNegotiator;
import io.grpc.netty.InternalProtocolNegotiator.ProtocolNegotiator;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.util.AsciiString;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Provides secure and authenticated commmunication between two cloud VMs using ALTS.
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/4151")
public final class AltsChannelCredentials {
private static final Logger logger = Logger.getLogger(AltsChannelCredentials.class.getName());
private AltsChannelCredentials() {}
public static ChannelCredentials create() {
return newBuilder().build();
}
public static Builder newBuilder() {
return new Builder();
}
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/4151")
public static final class Builder {
private final ImmutableList.Builder<String> targetServiceAccountsBuilder =
ImmutableList.builder();
private ObjectPool<Channel> handshakerChannelPool =
SharedResourcePool.forResource(HandshakerServiceChannel.SHARED_HANDSHAKER_CHANNEL);
private boolean enableUntrustedAlts;
/**
* Adds an expected target service accounts. One of the added service accounts should match peer
* service account in the handshaker result. Otherwise, the handshake fails.
*/
public Builder addTargetServiceAccount(String targetServiceAccount) {
targetServiceAccountsBuilder.add(targetServiceAccount);
return this;
}
/**
* Enables untrusted ALTS for testing. If this function is called, we will not check whether
* ALTS is running on Google Cloud Platform.
*/
public Builder enableUntrustedAltsForTesting() {
enableUntrustedAlts = true;
return this;
}
/** Sets a new handshaker service address for testing. */
public Builder setHandshakerAddressForTesting(String handshakerAddress) {
// Instead of using the default shared channel to the handshaker service, create a separate
// resource to the test address.
handshakerChannelPool =
SharedResourcePool.forResource(
HandshakerServiceChannel.getHandshakerChannelForTesting(handshakerAddress));
return this;
}
public ChannelCredentials build() {
return InternalNettyChannelCredentials.create(buildProtocolNegotiatorFactory());
}
InternalProtocolNegotiator.ClientFactory buildProtocolNegotiatorFactory() {
if (!CheckGcpEnvironment.isOnGcp()) {
if (enableUntrustedAlts) {
logger.log(
Level.WARNING,
"Untrusted ALTS mode is enabled and we cannot guarantee the trustworthiness of the "
+ "ALTS handshaker service");
} else {
Status status = Status.INTERNAL.withDescription(
"ALTS is only allowed to run on Google Cloud Platform");
return new FailingProtocolNegotiatorFactory(status);
}
}
return new ClientAltsProtocolNegotiatorFactory(
targetServiceAccountsBuilder.build(), handshakerChannelPool);
}
}
private static final class FailingProtocolNegotiatorFactory
implements InternalProtocolNegotiator.ClientFactory {
private final Status status;
public FailingProtocolNegotiatorFactory(Status status) {
this.status = status;
}
@Override
public ProtocolNegotiator newNegotiator() {
return new FailingProtocolNegotiator(status);
}
@Override
public int getDefaultPort() {
return 443;
}
}
private static final AsciiString SCHEME = AsciiString.of("https");
static final class FailingProtocolNegotiator implements ProtocolNegotiator {
private final Status status;
public FailingProtocolNegotiator(Status status) {
this.status = status;
}
@Override
public AsciiString scheme() {
return SCHEME;
}
@Override
public ChannelHandler newHandler(GrpcHttp2ConnectionHandler grpcHandler) {
return new ChannelHandlerAdapter() {
@Override public void handlerAdded(ChannelHandlerContext ctx) {
ctx.fireExceptionCaught(status.asRuntimeException());
}
};
}
@Override
public void close() {}
}
}