#20023

Committed 21 Oct 2025 04:08PM UTC coverage: 88.596% (+0.03%) from 88.571%

Build # #20023

Build Type

push

github

Committed by

web-flow

Commit Message

xds: Introduce flag for fallback to use the xds channel authority if no SNI is determined to be used. (#12422)

This is to allow the previous behavior if needed, and when the xds
channel authority is used as the SNI, it won't be used for the SAN
validation.

Run Details

34951 of 39450 relevant lines covered (88.6%)

0.89 hits per line

Source File
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91.25

/../netty/src/main/java/io/grpc/netty/ProtocolNegotiators.java

/*
 * Copyright 2015 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.netty;

import static com.google.common.base.Preconditions.checkState;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.errorprone.annotations.ForOverride;
import io.grpc.Attributes;
import io.grpc.CallCredentials;
import io.grpc.ChannelCredentials;
import io.grpc.ChannelLogger;
import io.grpc.ChannelLogger.ChannelLogLevel;
import io.grpc.ChoiceChannelCredentials;
import io.grpc.ChoiceServerCredentials;
import io.grpc.CompositeCallCredentials;
import io.grpc.CompositeChannelCredentials;
import io.grpc.Grpc;
import io.grpc.InsecureChannelCredentials;
import io.grpc.InsecureServerCredentials;
import io.grpc.InternalChannelz.Security;
import io.grpc.InternalChannelz.Tls;
import io.grpc.SecurityLevel;
import io.grpc.ServerCredentials;
import io.grpc.Status;
import io.grpc.TlsChannelCredentials;
import io.grpc.TlsServerCredentials;
import io.grpc.internal.CertificateUtils;
import io.grpc.internal.GrpcAttributes;
import io.grpc.internal.GrpcUtil;
import io.grpc.internal.NoopSslSession;
import io.grpc.internal.ObjectPool;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.DefaultHttpRequest;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpClientUpgradeHandler;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.codec.http2.Http2ClientUpgradeCodec;
import io.netty.handler.proxy.HttpProxyHandler;
import io.netty.handler.proxy.ProxyConnectionEvent;
import io.netty.handler.ssl.OpenSsl;
import io.netty.handler.ssl.OpenSslEngine;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.SslHandler;
import io.netty.handler.ssl.SslHandshakeCompletionEvent;
import io.netty.handler.ssl.SslProvider;
import io.netty.util.AsciiString;
import java.io.ByteArrayInputStream;
import java.net.SocketAddress;
import java.net.URI;
import java.nio.channels.ClosedChannelException;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Executor;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLParameters;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement;

/**
 * Common {@link ProtocolNegotiator}s used by gRPC.
 */
final class ProtocolNegotiators {
  private static final Logger log = Logger.getLogger(ProtocolNegotiators.class.getName());
  private static final EnumSet<TlsChannelCredentials.Feature> understoodTlsFeatures =
      EnumSet.of(
          TlsChannelCredentials.Feature.MTLS, TlsChannelCredentials.Feature.CUSTOM_MANAGERS);
  private static final EnumSet<TlsServerCredentials.Feature> understoodServerTlsFeatures =
      EnumSet.of(
          TlsServerCredentials.Feature.MTLS, TlsServerCredentials.Feature.CUSTOM_MANAGERS);

  private ProtocolNegotiators() {
  }

  public static FromChannelCredentialsResult from(ChannelCredentials creds) {
    if (creds instanceof TlsChannelCredentials) {
      TlsChannelCredentials tlsCreds = (TlsChannelCredentials) creds;
      Set<TlsChannelCredentials.Feature> incomprehensible =
          tlsCreds.incomprehensible(understoodTlsFeatures);
      if (!incomprehensible.isEmpty()) {
        return FromChannelCredentialsResult.error(
            "TLS features not understood: " + incomprehensible);
      }
      SslContextBuilder builder = GrpcSslContexts.forClient();
      if (tlsCreds.getKeyManagers() != null) {
        builder.keyManager(new FixedKeyManagerFactory(tlsCreds.getKeyManagers()));
      } else if (tlsCreds.getPrivateKey() != null) {
        builder.keyManager(
            new ByteArrayInputStream(tlsCreds.getCertificateChain()),
            new ByteArrayInputStream(tlsCreds.getPrivateKey()),
            tlsCreds.getPrivateKeyPassword());
      }
      try {
        List<TrustManager> trustManagers;
        if (tlsCreds.getTrustManagers() != null) {
          trustManagers = tlsCreds.getTrustManagers();
        } else if (tlsCreds.getRootCertificates() != null) {
          trustManagers = Arrays.asList(CertificateUtils.createTrustManager(
                  new ByteArrayInputStream(tlsCreds.getRootCertificates())));
        } else { // else use system default
          TrustManagerFactory tmf = TrustManagerFactory.getInstance(
              TrustManagerFactory.getDefaultAlgorithm());
          tmf.init((KeyStore) null);
          trustManagers = Arrays.asList(tmf.getTrustManagers());
        }
        builder.trustManager(new FixedTrustManagerFactory(trustManagers));
        TrustManager x509ExtendedTrustManager =
            CertificateUtils.getX509ExtendedTrustManager(trustManagers);
        return FromChannelCredentialsResult.negotiator(tlsClientFactory(builder.build(),
                (X509TrustManager) x509ExtendedTrustManager));
      } catch (SSLException | GeneralSecurityException ex) {
        log.log(Level.FINE, "Exception building SslContext", ex);
        return FromChannelCredentialsResult.error(
            "Unable to create SslContext: " + ex.getMessage());
      }

    } else if (creds instanceof InsecureChannelCredentials) {
      return FromChannelCredentialsResult.negotiator(plaintextClientFactory());

    } else if (creds instanceof CompositeChannelCredentials) {
      CompositeChannelCredentials compCreds = (CompositeChannelCredentials) creds;
      return from(compCreds.getChannelCredentials())
          .withCallCredentials(compCreds.getCallCredentials());

    } else if (creds instanceof NettyChannelCredentials) {
      NettyChannelCredentials nettyCreds = (NettyChannelCredentials) creds;
      return FromChannelCredentialsResult.negotiator(nettyCreds.getNegotiator());

    } else if (creds instanceof ChoiceChannelCredentials) {
      ChoiceChannelCredentials choiceCreds = (ChoiceChannelCredentials) creds;
      StringBuilder error = new StringBuilder();
      for (ChannelCredentials innerCreds : choiceCreds.getCredentialsList()) {
        FromChannelCredentialsResult result = from(innerCreds);
        if (result.error == null) {
          return result;
        }
        error.append(", ");
        error.append(result.error);
      }
      return FromChannelCredentialsResult.error(error.substring(2));

    } else {
      return FromChannelCredentialsResult.error(
          "Unsupported credential type: " + creds.getClass().getName());
    }
  }

  public static FromServerCredentialsResult from(ServerCredentials creds) {
    if (creds instanceof TlsServerCredentials) {
      TlsServerCredentials tlsCreds = (TlsServerCredentials) creds;
      Set<TlsServerCredentials.Feature> incomprehensible =
          tlsCreds.incomprehensible(understoodServerTlsFeatures);
      if (!incomprehensible.isEmpty()) {
        return FromServerCredentialsResult.error(
            "TLS features not understood: " + incomprehensible);
      }
      SslContextBuilder builder;
      if (tlsCreds.getKeyManagers() != null) {
        builder = GrpcSslContexts.configure(SslContextBuilder.forServer(
            new FixedKeyManagerFactory(tlsCreds.getKeyManagers())));
      } else if (tlsCreds.getPrivateKey() != null) {
        builder = GrpcSslContexts.forServer(
            new ByteArrayInputStream(tlsCreds.getCertificateChain()),
            new ByteArrayInputStream(tlsCreds.getPrivateKey()),
            tlsCreds.getPrivateKeyPassword());
      } else {
        throw new AssertionError("BUG! No key");
      }
      if (tlsCreds.getTrustManagers() != null) {
        builder.trustManager(new FixedTrustManagerFactory(tlsCreds.getTrustManagers()));
      } else if (tlsCreds.getRootCertificates() != null) {
        builder.trustManager(new ByteArrayInputStream(tlsCreds.getRootCertificates()));
      } // else use system default
      switch (tlsCreds.getClientAuth()) {
        case OPTIONAL:
          builder.clientAuth(io.netty.handler.ssl.ClientAuth.OPTIONAL);
          break;

        case REQUIRE:
          builder.clientAuth(io.netty.handler.ssl.ClientAuth.REQUIRE);
          break;

        case NONE:
          builder.clientAuth(io.netty.handler.ssl.ClientAuth.NONE);
          break;

        default:
          return FromServerCredentialsResult.error(
              "Unknown TlsServerCredentials.ClientAuth value: " + tlsCreds.getClientAuth());
      }
      SslContext sslContext;
      try {
        sslContext = builder.build();
      } catch (SSLException ex) {
        throw new IllegalArgumentException(
            "Unexpected error converting ServerCredentials to Netty SslContext", ex);
      }
      return FromServerCredentialsResult.negotiator(serverTlsFactory(sslContext));

    } else if (creds instanceof InsecureServerCredentials) {
      return FromServerCredentialsResult.negotiator(serverPlaintextFactory());

    } else if (creds instanceof NettyServerCredentials) {
      NettyServerCredentials nettyCreds = (NettyServerCredentials) creds;
      return FromServerCredentialsResult.negotiator(nettyCreds.getNegotiator());

    } else if (creds instanceof ChoiceServerCredentials) {
      ChoiceServerCredentials choiceCreds = (ChoiceServerCredentials) creds;
      StringBuilder error = new StringBuilder();
      for (ServerCredentials innerCreds : choiceCreds.getCredentialsList()) {
        FromServerCredentialsResult result = from(innerCreds);
        if (result.error == null) {
          return result;
        }
        error.append(", ");
        error.append(result.error);
      }
      return FromServerCredentialsResult.error(error.substring(2));

    } else {
      return FromServerCredentialsResult.error(
          "Unsupported credential type: " + creds.getClass().getName());
    }
  }

  public static final class FromChannelCredentialsResult {
    public final ProtocolNegotiator.ClientFactory negotiator;
    public final CallCredentials callCredentials;
    public final String error;

    private FromChannelCredentialsResult(ProtocolNegotiator.ClientFactory negotiator,
        CallCredentials creds, String error) {
      this.negotiator = negotiator;
      this.callCredentials = creds;
      this.error = error;
    }

    public static FromChannelCredentialsResult error(String error) {
      return new FromChannelCredentialsResult(
          null, null, Preconditions.checkNotNull(error, "error"));
    }

    public static FromChannelCredentialsResult negotiator(
        ProtocolNegotiator.ClientFactory factory) {
      return new FromChannelCredentialsResult(
          Preconditions.checkNotNull(factory, "factory"), null, null);
    }

    public FromChannelCredentialsResult withCallCredentials(CallCredentials callCreds) {
      Preconditions.checkNotNull(callCreds, "callCreds");
      if (error != null) {
        return this;
      }
      if (this.callCredentials != null) {
        callCreds = new CompositeCallCredentials(this.callCredentials, callCreds);
      }
      return new FromChannelCredentialsResult(negotiator, callCreds, null);
    }
  }

  public static final class FromServerCredentialsResult {
    public final ProtocolNegotiator.ServerFactory negotiator;
    public final String error;

    private FromServerCredentialsResult(ProtocolNegotiator.ServerFactory negotiator, String error) {
      this.negotiator = negotiator;
      this.error = error;
    }

    public static FromServerCredentialsResult error(String error) {
      return new FromServerCredentialsResult(null, Preconditions.checkNotNull(error, "error"));
    }

    public static FromServerCredentialsResult negotiator(ProtocolNegotiator.ServerFactory factory) {
      return new FromServerCredentialsResult(Preconditions.checkNotNull(factory, "factory"), null);
    }
  }

  public static ProtocolNegotiator.ServerFactory fixedServerFactory(
      ProtocolNegotiator negotiator) {
    return new FixedProtocolNegotiatorServerFactory(negotiator);
  }

  private static final class FixedProtocolNegotiatorServerFactory
      implements ProtocolNegotiator.ServerFactory {
    private final ProtocolNegotiator protocolNegotiator;

    public FixedProtocolNegotiatorServerFactory(ProtocolNegotiator protocolNegotiator) {
      this.protocolNegotiator =
          Preconditions.checkNotNull(protocolNegotiator, "protocolNegotiator");
    }

    @Override
    public ProtocolNegotiator newNegotiator(ObjectPool<? extends Executor> offloadExecutorPool) {
      return protocolNegotiator;
    }
  }

  /**
   * Create a server plaintext handler for gRPC.
   */
  public static ProtocolNegotiator serverPlaintext() {
    return new PlaintextProtocolNegotiator();
  }

  /**
   * Create a server plaintext handler factory for gRPC.
   */
  public static ProtocolNegotiator.ServerFactory serverPlaintextFactory() {
    return new PlaintextProtocolNegotiatorServerFactory();
  }

  @VisibleForTesting
  static final class PlaintextProtocolNegotiatorServerFactory
      implements ProtocolNegotiator.ServerFactory {
    @Override
    public ProtocolNegotiator newNegotiator(ObjectPool<? extends Executor> offloadExecutorPool) {
      return serverPlaintext();
    }
  }

  public static ProtocolNegotiator.ServerFactory serverTlsFactory(SslContext sslContext) {
    return new TlsProtocolNegotiatorServerFactory(sslContext);
  }

  @VisibleForTesting
  static final class TlsProtocolNegotiatorServerFactory
      implements ProtocolNegotiator.ServerFactory {
    private final SslContext sslContext;

    public TlsProtocolNegotiatorServerFactory(SslContext sslContext) {
      this.sslContext = Preconditions.checkNotNull(sslContext, "sslContext");
    }

    @Override
    public ProtocolNegotiator newNegotiator(ObjectPool<? extends Executor> offloadExecutorPool) {
      return serverTls(sslContext, offloadExecutorPool);
    }
  }

  /**
   * Create a server TLS handler for HTTP/2 capable of using ALPN/NPN.
   * @param executorPool a dedicated {@link Executor} pool for time-consuming TLS tasks
   */
  public static ProtocolNegotiator serverTls(final SslContext sslContext,
      final ObjectPool<? extends Executor> executorPool) {
    Preconditions.checkNotNull(sslContext, "sslContext");
    final Executor executor;
    if (executorPool != null) {
      // The handlers here can out-live the {@link ProtocolNegotiator}.
      // To keep their own reference to executor from executorPool, we use an extra (unused)
      // reference here forces the executor to stay alive, which prevents it from being re-created
      // for every connection.
      executor = executorPool.getObject();
    } else {
      executor = null;
    }
    return new ProtocolNegotiator() {
      @Override
      public ChannelHandler newHandler(GrpcHttp2ConnectionHandler handler) {
        ChannelHandler gnh = new GrpcNegotiationHandler(handler);
        ChannelHandler sth = new ServerTlsHandler(gnh, sslContext, executorPool);
        return new WaitUntilActiveHandler(sth, handler.getNegotiationLogger());
      }

      @Override
      public void close() {
        if (executorPool != null && executor != null) {
          executorPool.returnObject(executor);
        }
      }

      @Override
      public AsciiString scheme() {
        return Utils.HTTPS;
      }
    };
  }

  /**
   * Create a server TLS handler for HTTP/2 capable of using ALPN/NPN.
   */
  public static ProtocolNegotiator serverTls(final SslContext sslContext) {
    return serverTls(sslContext, null);
  }

  static final class ServerTlsHandler extends ChannelInboundHandlerAdapter {
    private Executor executor;
    private final ChannelHandler next;
    private final SslContext sslContext;

    private ProtocolNegotiationEvent pne = ProtocolNegotiationEvent.DEFAULT;

    ServerTlsHandler(ChannelHandler next,
        SslContext sslContext,
        final ObjectPool<? extends Executor> executorPool) {
      this.sslContext = Preconditions.checkNotNull(sslContext, "sslContext");
      this.next = Preconditions.checkNotNull(next, "next");
      if (executorPool != null) {
        this.executor = executorPool.getObject();
      }
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
      super.handlerAdded(ctx);
      SSLEngine sslEngine = sslContext.newEngine(ctx.alloc());
      ctx.pipeline().addBefore(ctx.name(), /* name= */ null, this.executor != null
          ? new SslHandler(sslEngine, false, this.executor)
          : new SslHandler(sslEngine, false));
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
      if (evt instanceof ProtocolNegotiationEvent) {
        pne = (ProtocolNegotiationEvent) evt;
      } else if (evt instanceof SslHandshakeCompletionEvent) {
        SslHandshakeCompletionEvent handshakeEvent = (SslHandshakeCompletionEvent) evt;
        if (!handshakeEvent.isSuccess()) {
          logSslEngineDetails(Level.FINE, ctx, "TLS negotiation failed for new client.", null);
          ctx.fireExceptionCaught(handshakeEvent.cause());
          return;
        }
        SslHandler sslHandler = ctx.pipeline().get(SslHandler.class);
        if (!sslContext.applicationProtocolNegotiator().protocols().contains(
                sslHandler.applicationProtocol())) {
          logSslEngineDetails(Level.FINE, ctx, "TLS negotiation failed for new client.", null);
          ctx.fireExceptionCaught(unavailableException(
              "Failed protocol negotiation: Unable to find compatible protocol"));
          return;
        }
        ctx.pipeline().replace(ctx.name(), null, next);
        fireProtocolNegotiationEvent(ctx, sslHandler.engine().getSession());
      } else {
        super.userEventTriggered(ctx, evt);
      }
    }

    private void fireProtocolNegotiationEvent(ChannelHandlerContext ctx, SSLSession session) {
      Security security = new Security(new Tls(session));
      Attributes attrs = pne.getAttributes().toBuilder()
          .set(GrpcAttributes.ATTR_SECURITY_LEVEL, SecurityLevel.PRIVACY_AND_INTEGRITY)
          .set(Grpc.TRANSPORT_ATTR_SSL_SESSION, session)
          .build();
      ctx.fireUserEventTriggered(pne.withAttributes(attrs).withSecurity(security));
    }
  }

  /**
   * Returns a {@link ProtocolNegotiator} that does HTTP CONNECT proxy negotiation.
   */
  public static ProtocolNegotiator httpProxy(final SocketAddress proxyAddress,
      final @Nullable String proxyUsername, final @Nullable String proxyPassword,
      final ProtocolNegotiator negotiator) {
    Preconditions.checkNotNull(negotiator, "negotiator");
    Preconditions.checkNotNull(proxyAddress, "proxyAddress");
    final AsciiString scheme = negotiator.scheme();
    class ProxyNegotiator implements ProtocolNegotiator {
      @Override
      public ChannelHandler newHandler(GrpcHttp2ConnectionHandler http2Handler) {
        ChannelHandler protocolNegotiationHandler = negotiator.newHandler(http2Handler);
        ChannelLogger negotiationLogger = http2Handler.getNegotiationLogger();
        return new ProxyProtocolNegotiationHandler(
            proxyAddress, proxyUsername, proxyPassword, protocolNegotiationHandler,
            negotiationLogger);
      }

      @Override
      public AsciiString scheme() {
        return scheme;
      }

      // This method is not normally called, because we use httpProxy on a per-connection basis in
      // NettyChannelBuilder. Instead, we expect `negotiator' to be closed by NettyTransportFactory.
      @Override
      public void close() {
        negotiator.close();
      }
    }

    return new ProxyNegotiator();
  }

  /**
   * A Proxy handler follows {@link ProtocolNegotiationHandler} pattern. Upon successful proxy
   * connection, this handler will install {@code next} handler which should be a handler from
   * other type of {@link ProtocolNegotiator} to continue negotiating protocol using proxy.
   */
  static final class ProxyProtocolNegotiationHandler extends ProtocolNegotiationHandler {

    private final SocketAddress address;
    @Nullable private final String userName;
    @Nullable private final String password;

    public ProxyProtocolNegotiationHandler(
        SocketAddress address,
        @Nullable String userName,
        @Nullable String password,
        ChannelHandler next,
        ChannelLogger negotiationLogger) {
      super(next, negotiationLogger);
      this.address = Preconditions.checkNotNull(address, "address");
      this.userName = userName;
      this.password = password;
    }

    @Override
    protected void protocolNegotiationEventTriggered(ChannelHandlerContext ctx) {
      HttpProxyHandler nettyProxyHandler;
      if (userName == null || password == null) {
        nettyProxyHandler = new HttpProxyHandler(address);
      } else {
        nettyProxyHandler = new HttpProxyHandler(address, userName, password);
      }
      ctx.pipeline().addBefore(ctx.name(), /* name= */ null, nettyProxyHandler);
    }

    @Override
    protected void userEventTriggered0(ChannelHandlerContext ctx, Object evt) throws Exception {
      if (evt instanceof ProxyConnectionEvent) {
        fireProtocolNegotiationEvent(ctx);
      } else {
        super.userEventTriggered(ctx, evt);
      }
    }
  }

  static final class ClientTlsProtocolNegotiator implements ProtocolNegotiator {

    public ClientTlsProtocolNegotiator(SslContext sslContext,
        ObjectPool<? extends Executor> executorPool, Optional<Runnable> handshakeCompleteRunnable,
        X509TrustManager x509ExtendedTrustManager, String sni) {
      this.sslContext = Preconditions.checkNotNull(sslContext, "sslContext");
      this.executorPool = executorPool;
      if (this.executorPool != null) {
        this.executor = this.executorPool.getObject();
      }
      this.handshakeCompleteRunnable = handshakeCompleteRunnable;
      this.x509ExtendedTrustManager = x509ExtendedTrustManager;
      this.sni = sni;
    }

    private final SslContext sslContext;
    private final ObjectPool<? extends Executor> executorPool;
    private final Optional<Runnable> handshakeCompleteRunnable;
    private final X509TrustManager x509ExtendedTrustManager;
    private final String sni;
    private Executor executor;

    @Override
    public AsciiString scheme() {
      return Utils.HTTPS;
    }

    @Override
    public ChannelHandler newHandler(GrpcHttp2ConnectionHandler grpcHandler) {
      ChannelHandler gnh = new GrpcNegotiationHandler(grpcHandler);
      ChannelLogger negotiationLogger = grpcHandler.getNegotiationLogger();
      String authority;
      if ("".equals(sni)) {
        authority = null;
      } else if (sni != null) {
        authority = sni;
      } else {
        authority = grpcHandler.getAuthority();
      }
      ChannelHandler cth = new ClientTlsHandler(gnh, sslContext,
          authority, this.executor, negotiationLogger, handshakeCompleteRunnable, this,
          x509ExtendedTrustManager);
      return new WaitUntilActiveHandler(cth, negotiationLogger);
    }

    @Override
    public void close() {
      if (this.executorPool != null && this.executor != null) {
        this.executorPool.returnObject(this.executor);
      }
    }

    @VisibleForTesting
    boolean hasX509ExtendedTrustManager() {
      return x509ExtendedTrustManager != null;
    }
  }

  static final class ClientTlsHandler extends ProtocolNegotiationHandler {

    private final SslContext sslContext;
    private final String host;
    private final int port;
    private Executor executor;
    private final Optional<Runnable> handshakeCompleteRunnable;
    private final X509TrustManager x509TrustManager;
    private SSLEngine sslEngine;

    ClientTlsHandler(ChannelHandler next, SslContext sslContext, String authority,
        Executor executor, ChannelLogger negotiationLogger,
        Optional<Runnable> handshakeCompleteRunnable,
        ClientTlsProtocolNegotiator clientTlsProtocolNegotiator,
        X509TrustManager x509TrustManager) {
      super(next, negotiationLogger);
      this.sslContext = Preconditions.checkNotNull(sslContext, "sslContext");
      if (authority != null) {
        HostPort hostPort = parseAuthority(authority);
        this.host = hostPort.host;
        this.port = hostPort.port;
      } else {
        this.host = null;
        this.port = 0;
      }
      this.executor = executor;
      this.handshakeCompleteRunnable = handshakeCompleteRunnable;
      this.x509TrustManager = x509TrustManager;
    }

    @Override
    @IgnoreJRERequirement
    protected void handlerAdded0(ChannelHandlerContext ctx) {
      if (host != null) {
        sslEngine = sslContext.newEngine(ctx.alloc(), host, port);
      } else {
        sslEngine = sslContext.newEngine(ctx.alloc());
      }
      SSLParameters sslParams = sslEngine.getSSLParameters();
      sslParams.setEndpointIdentificationAlgorithm("HTTPS");
      sslEngine.setSSLParameters(sslParams);
      ctx.pipeline().addBefore(ctx.name(), /* name= */ null, this.executor != null
          ? new SslHandler(sslEngine, false, this.executor)
          : new SslHandler(sslEngine, false));
    }

    @Override
    protected void userEventTriggered0(ChannelHandlerContext ctx, Object evt) throws Exception {
      if (evt instanceof SslHandshakeCompletionEvent) {
        SslHandshakeCompletionEvent handshakeEvent = (SslHandshakeCompletionEvent) evt;
        if (handshakeEvent.isSuccess()) {
          SslHandler handler = ctx.pipeline().get(SslHandler.class);
          if (sslContext.applicationProtocolNegotiator().protocols()
              .contains(handler.applicationProtocol())) {
            // Successfully negotiated the protocol.
            logSslEngineDetails(Level.FINER, ctx, "TLS negotiation succeeded.", null);
            propagateTlsComplete(ctx, handler.engine().getSession());
          } else {
            Exception ex =
                unavailableException("Failed ALPN negotiation: Unable to find compatible protocol");
            logSslEngineDetails(Level.FINE, ctx, "TLS negotiation failed.", ex);
            if (handshakeCompleteRunnable.isPresent()) {
              handshakeCompleteRunnable.get().run();
            }
            ctx.fireExceptionCaught(ex);
          }
        } else {
          Throwable t = handshakeEvent.cause();
          if (t instanceof ClosedChannelException) {
            // On channelInactive(), SslHandler creates its own ClosedChannelException and
            // propagates it before the actual channelInactive(). So we assume here that any
            // such exception is from channelInactive() and emulate the normal behavior of
            // WriteBufferingAndExceptionHandler
            t = Status.UNAVAILABLE
                .withDescription("Connection closed while performing TLS negotiation")
                .withCause(t)
                .asRuntimeException();
          }
          if (handshakeCompleteRunnable.isPresent()) {
            handshakeCompleteRunnable.get().run();
          }
          ctx.fireExceptionCaught(t);
        }
      } else {
        super.userEventTriggered0(ctx, evt);
      }
    }

    private void propagateTlsComplete(ChannelHandlerContext ctx, SSLSession session) {
      Security security = new Security(new Tls(session));
      ProtocolNegotiationEvent existingPne = getProtocolNegotiationEvent();
      Attributes attrs = existingPne.getAttributes().toBuilder()
          .set(GrpcAttributes.ATTR_SECURITY_LEVEL, SecurityLevel.PRIVACY_AND_INTEGRITY)
          .set(Grpc.TRANSPORT_ATTR_SSL_SESSION, session)
          .set(GrpcAttributes.ATTR_AUTHORITY_VERIFIER, new X509AuthorityVerifier(
              sslEngine, x509TrustManager))
          .build();
      replaceProtocolNegotiationEvent(existingPne.withAttributes(attrs).withSecurity(security));
      if (handshakeCompleteRunnable.isPresent()) {
        handshakeCompleteRunnable.get().run();
      }
      fireProtocolNegotiationEvent(ctx);
    }
  }

  @VisibleForTesting
  static HostPort parseAuthority(String authority) {
    URI uri = GrpcUtil.authorityToUri(Preconditions.checkNotNull(authority, "authority"));
    String host;
    int port;
    if (uri.getHost() != null) {
      host = uri.getHost();
      port = uri.getPort();
    } else {
      /*
       * Implementation note: We pick -1 as the port here rather than deriving it from the
       * original socket address.  The SSL engine doesn't use this port number when contacting the
       * remote server, but rather it is used for other things like SSL Session caching.  When an
       * invalid authority is provided (like "bad_cert"), picking the original port and passing it
       * in would mean that the port might used under the assumption that it was correct.   By
       * using -1 here, it forces the SSL implementation to treat it as invalid.
       */
      host = authority;
      port = -1;
    }
    return new HostPort(host, port);
  }

  /**
   * Returns a {@link ProtocolNegotiator} that ensures the pipeline is set up so that TLS will
   * be negotiated, the {@code handler} is added and writes to the {@link io.netty.channel.Channel}
   * may happen immediately, even before the TLS Handshake is complete.
   *
   * @param executorPool a dedicated {@link Executor} pool for time-consuming TLS tasks
   */
  public static ProtocolNegotiator tls(SslContext sslContext,
      ObjectPool<? extends Executor> executorPool, Optional<Runnable> handshakeCompleteRunnable,
      X509TrustManager x509ExtendedTrustManager, String sni) {
    return new ClientTlsProtocolNegotiator(sslContext, executorPool, handshakeCompleteRunnable,
        x509ExtendedTrustManager, sni);
  }

  /**
   * Returns a {@link ProtocolNegotiator} that ensures the pipeline is set up so that TLS will
   * be negotiated, the {@code handler} is added and writes to the {@link io.netty.channel.Channel}
   * may happen immediately, even before the TLS Handshake is complete.
   */
  public static ProtocolNegotiator tls(SslContext sslContext,
      X509TrustManager x509ExtendedTrustManager) {
    return tls(sslContext, null, Optional.absent(), x509ExtendedTrustManager, null);
  }

  public static ProtocolNegotiator.ClientFactory tlsClientFactory(SslContext sslContext,
      X509TrustManager x509ExtendedTrustManager) {
    return new TlsProtocolNegotiatorClientFactory(sslContext, x509ExtendedTrustManager);
  }

  @VisibleForTesting
  static final class TlsProtocolNegotiatorClientFactory
      implements ProtocolNegotiator.ClientFactory {
    private final SslContext sslContext;
    private final X509TrustManager x509ExtendedTrustManager;

    public TlsProtocolNegotiatorClientFactory(SslContext sslContext,
                                              X509TrustManager x509ExtendedTrustManager) {
      this.sslContext = Preconditions.checkNotNull(sslContext, "sslContext");
      this.x509ExtendedTrustManager = x509ExtendedTrustManager;
    }

    @Override public ProtocolNegotiator newNegotiator() {
      return tls(sslContext, x509ExtendedTrustManager);
    }

    @Override public int getDefaultPort() {
      return GrpcUtil.DEFAULT_PORT_SSL;
    }
  }

  /** A tuple of (host, port). */
  @VisibleForTesting
  static final class HostPort {
    final String host;
    final int port;

    public HostPort(String host, int port) {
      this.host = host;
      this.port = port;
    }
  }

  /**
   * Returns a {@link ProtocolNegotiator} used for upgrading to HTTP/2 from HTTP/1.x.
   */
  public static ProtocolNegotiator plaintextUpgrade() {
    return new PlaintextUpgradeProtocolNegotiator();
  }

  public static ProtocolNegotiator.ClientFactory plaintextUpgradeClientFactory() {
    return new PlaintextUpgradeProtocolNegotiatorClientFactory();
  }

  private static final class PlaintextUpgradeProtocolNegotiatorClientFactory
      implements ProtocolNegotiator.ClientFactory {
    @Override public ProtocolNegotiator newNegotiator() {
      return plaintextUpgrade();
    }

    @Override public int getDefaultPort() {
      return GrpcUtil.DEFAULT_PORT_PLAINTEXT;
    }
  }

  static final class PlaintextUpgradeProtocolNegotiator implements ProtocolNegotiator {

    @Override
    public AsciiString scheme() {
      return Utils.HTTP;
    }

    @Override
    public ChannelHandler newHandler(GrpcHttp2ConnectionHandler grpcHandler) {
      ChannelHandler upgradeHandler =
          new Http2UpgradeAndGrpcHandler(grpcHandler.getAuthority(), grpcHandler);
      ChannelHandler plaintextHandler =
          new PlaintextHandler(upgradeHandler, grpcHandler.getNegotiationLogger());
      return new WaitUntilActiveHandler(plaintextHandler, grpcHandler.getNegotiationLogger());
    }

    @Override
    public void close() {}
  }

  /**
   * Acts as a combination of Http2Upgrade and {@link GrpcNegotiationHandler}.  Unfortunately,
   * this negotiator doesn't follow the pattern of "just one handler doing negotiation at a time."
   * This is due to the tight coupling between the upgrade handler and the HTTP/2 handler.
   */
  static final class Http2UpgradeAndGrpcHandler extends ChannelInboundHandlerAdapter {

    private final String authority;
    private final GrpcHttp2ConnectionHandler next;
    private final ChannelLogger negotiationLogger;

    private ProtocolNegotiationEvent pne;

    Http2UpgradeAndGrpcHandler(String authority, GrpcHttp2ConnectionHandler next) {
      this.authority = Preconditions.checkNotNull(authority, "authority");
      this.next = Preconditions.checkNotNull(next, "next");
      this.negotiationLogger = next.getNegotiationLogger();
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
      negotiationLogger.log(ChannelLogLevel.INFO, "Http2Upgrade started");
      HttpClientCodec httpClientCodec = new HttpClientCodec();
      ctx.pipeline().addBefore(ctx.name(), null, httpClientCodec);

      Http2ClientUpgradeCodec upgradeCodec = new Http2ClientUpgradeCodec(next);
      HttpClientUpgradeHandler upgrader =
          new HttpClientUpgradeHandler(httpClientCodec, upgradeCodec, /*maxContentLength=*/ 1000);
      ctx.pipeline().addBefore(ctx.name(), null, upgrader);

      // Trigger the HTTP/1.1 plaintext upgrade protocol by issuing an HTTP request
      // which causes the upgrade headers to be added
      DefaultHttpRequest upgradeTrigger =
          new DefaultHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, "/");
      upgradeTrigger.headers().add(HttpHeaderNames.HOST, authority);
      ctx.writeAndFlush(upgradeTrigger).addListener(
          ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
      super.handlerAdded(ctx);
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
      if (evt instanceof ProtocolNegotiationEvent) {
        checkState(pne == null, "negotiation already started");
        pne = (ProtocolNegotiationEvent) evt;
      } else if (evt == HttpClientUpgradeHandler.UpgradeEvent.UPGRADE_SUCCESSFUL) {
        checkState(pne != null, "negotiation not yet complete");
        negotiationLogger.log(ChannelLogLevel.INFO, "Http2Upgrade finished");
        ctx.pipeline().remove(ctx.name());
        next.handleProtocolNegotiationCompleted(pne.getAttributes(), pne.getSecurity());
      } else if (evt == HttpClientUpgradeHandler.UpgradeEvent.UPGRADE_REJECTED) {
        ctx.fireExceptionCaught(unavailableException("HTTP/2 upgrade rejected"));
      } else {
        super.userEventTriggered(ctx, evt);
      }
    }
  }

  /**
   * Returns a {@link io.netty.channel.ChannelHandler} that ensures that the {@code handler} is
   * added to the pipeline writes to the {@link io.netty.channel.Channel} may happen immediately,
   * even before it is active.
   */
  public static ProtocolNegotiator plaintext() {
    return new PlaintextProtocolNegotiator();
  }

  public static ProtocolNegotiator.ClientFactory plaintextClientFactory() {
    return new PlaintextProtocolNegotiatorClientFactory();
  }

  @VisibleForTesting
  static final class PlaintextProtocolNegotiatorClientFactory
      implements ProtocolNegotiator.ClientFactory {
    @Override public ProtocolNegotiator newNegotiator() {
      return plaintext();
    }

    @Override public int getDefaultPort() {
      return GrpcUtil.DEFAULT_PORT_PLAINTEXT;
    }
  }

  private static RuntimeException unavailableException(String msg) {
    return Status.UNAVAILABLE.withDescription(msg).asRuntimeException();
  }

  @VisibleForTesting
  static void logSslEngineDetails(Level level, ChannelHandlerContext ctx, String msg,
      @Nullable Throwable t) {
    if (!log.isLoggable(level)) {
      return;
    }

    SslHandler sslHandler = ctx.pipeline().get(SslHandler.class);
    SSLEngine engine = sslHandler.engine();

    StringBuilder builder = new StringBuilder(msg);
    builder.append("\nSSLEngine Details: [\n");
    if (engine instanceof OpenSslEngine) {
      builder.append("    OpenSSL, ");
      builder.append("Version: 0x").append(Integer.toHexString(OpenSsl.version()));
      builder.append(" (").append(OpenSsl.versionString()).append("), ");
      builder.append("ALPN supported: ").append(SslProvider.isAlpnSupported(SslProvider.OPENSSL));
    } else if (JettyTlsUtil.isJettyAlpnConfigured()) {
      builder.append("    Jetty ALPN");
    } else if (JettyTlsUtil.isJettyNpnConfigured()) {
      builder.append("    Jetty NPN");
    } else if (JettyTlsUtil.isJava9AlpnAvailable()) {
      builder.append("    JDK9 ALPN");
    }
    builder.append("\n    TLS Protocol: ");
    builder.append(engine.getSession().getProtocol());
    builder.append("\n    Application Protocol: ");
    builder.append(sslHandler.applicationProtocol());
    builder.append("\n    Need Client Auth: " );
    builder.append(engine.getNeedClientAuth());
    builder.append("\n    Want Client Auth: ");
    builder.append(engine.getWantClientAuth());
    builder.append("\n    Supported protocols=");
    builder.append(Arrays.toString(engine.getSupportedProtocols()));
    builder.append("\n    Enabled protocols=");
    builder.append(Arrays.toString(engine.getEnabledProtocols()));
    builder.append("\n    Supported ciphers=");
    builder.append(Arrays.toString(engine.getSupportedCipherSuites()));
    builder.append("\n    Enabled ciphers=");
    builder.append(Arrays.toString(engine.getEnabledCipherSuites()));
    builder.append("\n]");

    log.log(level, builder.toString(), t);
  }

  /**
   * Adapts a {@link ProtocolNegotiationEvent} to the {@link GrpcHttp2ConnectionHandler}.
   */
  static final class GrpcNegotiationHandler extends ChannelInboundHandlerAdapter {
    private final GrpcHttp2ConnectionHandler next;

    public GrpcNegotiationHandler(GrpcHttp2ConnectionHandler next) {
      this.next = Preconditions.checkNotNull(next, "next");
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
      if (evt instanceof ProtocolNegotiationEvent) {
        ProtocolNegotiationEvent protocolNegotiationEvent = (ProtocolNegotiationEvent) evt;
        ctx.pipeline().replace(ctx.name(), null, next);
        next.handleProtocolNegotiationCompleted(
            protocolNegotiationEvent.getAttributes(), protocolNegotiationEvent.getSecurity());
      } else {
        super.userEventTriggered(ctx, evt);
      }
    }
  }

  /*
   * Common {@link ProtocolNegotiator}s used by gRPC.  Protocol negotiation follows a pattern to
   * simplify the pipeline.   The pipeline should look like:
   *
   * 1.  {@link ProtocolNegotiator#newHandler() PN.H}, created.
   * 2.  [Tail], {@link WriteBufferingAndExceptionHandler WBAEH}, [Head]
   * 3.  [Tail], WBAEH, PN.H, [Head]
   *
   * <p>Typically, PN.H with be an instance of {@link InitHandler IH}, which is a trivial handler
   * that can return the {@code scheme()} of the negotiation.  IH, and each handler after,
   * replaces itself with a "next" handler once its part of negotiation is complete.  This keeps
   * the pipeline small, and limits the interaction between handlers.
   *
   * <p>Additionally, each handler may fire a {@link ProtocolNegotiationEvent PNE} just after
   * replacing itself.  Handlers should capture user events of type PNE, and re-trigger the events
   * once that handler's part of negotiation is complete.  This can be seen in the
   * {@link WaitUntilActiveHandler WUAH}, which waits until the channel is active.  Once active, it
   * replaces itself with the next handler, and fires a PNE containing the addresses.  Continuing
   * with IH and WUAH:
   *
   * 3.  [Tail], WBAEH, IH, [Head]
   * 4.  [Tail], WBAEH, WUAH, [Head]
   * 5.  [Tail], WBAEH, {@link GrpcNegotiationHandler}, [Head]
   * 6a. [Tail], WBAEH, {@link GrpcHttp2ConnectionHandler GHCH}, [Head]
   * 6b. [Tail], GHCH, [Head]
   */

  /**
   * A negotiator that only does plain text.
   */
  static final class PlaintextProtocolNegotiator implements ProtocolNegotiator {

    @Override
    public ChannelHandler newHandler(GrpcHttp2ConnectionHandler grpcHandler) {
      ChannelHandler grpcNegotiationHandler = new GrpcNegotiationHandler(grpcHandler);
      ChannelHandler plaintextHandler =
          new PlaintextHandler(grpcNegotiationHandler, grpcHandler.getNegotiationLogger());
      ChannelHandler activeHandler = new WaitUntilActiveHandler(plaintextHandler,
          grpcHandler.getNegotiationLogger());
      return activeHandler;
    }

    @Override
    public void close() {}

    @Override
    public AsciiString scheme() {
      return Utils.HTTP;
    }
  }

  static final class PlaintextHandler extends ProtocolNegotiationHandler {
    PlaintextHandler(ChannelHandler next, ChannelLogger negotiationLogger) {
      super(next, negotiationLogger);
    }

    @Override
    protected void protocolNegotiationEventTriggered(ChannelHandlerContext ctx) {
      ProtocolNegotiationEvent existingPne = getProtocolNegotiationEvent();
      Attributes attrs = existingPne.getAttributes().toBuilder()
              .set(GrpcAttributes.ATTR_AUTHORITY_VERIFIER, (authority) -> Status.OK)
              .build();
      replaceProtocolNegotiationEvent(existingPne.withAttributes(attrs));
      fireProtocolNegotiationEvent(ctx);
    }
  }

  /**
   * Waits for the channel to be active, and then installs the next Handler.  Using this allows
   * subsequent handlers to assume the channel is active and ready to send.  Additionally, this a
   * {@link ProtocolNegotiationEvent}, with the connection addresses.
   */
  static final class WaitUntilActiveHandler extends ProtocolNegotiationHandler {

    boolean protocolNegotiationEventReceived;

    WaitUntilActiveHandler(ChannelHandler next, ChannelLogger negotiationLogger) {
      super(next, negotiationLogger);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
      if (protocolNegotiationEventReceived) {
        replaceOnActive(ctx);
        fireProtocolNegotiationEvent(ctx);
      }
      // Still propagate channelActive to the new handler.
      super.channelActive(ctx);
    }

    @Override
    protected void protocolNegotiationEventTriggered(ChannelHandlerContext ctx) {
      protocolNegotiationEventReceived = true;
      if (ctx.channel().isActive()) {
        replaceOnActive(ctx);
        fireProtocolNegotiationEvent(ctx);
      }
    }

    private void replaceOnActive(ChannelHandlerContext ctx) {
      ProtocolNegotiationEvent existingPne = getProtocolNegotiationEvent();
      Attributes attrs = existingPne.getAttributes().toBuilder()
          .set(Grpc.TRANSPORT_ATTR_LOCAL_ADDR, ctx.channel().localAddress())
          .set(Grpc.TRANSPORT_ATTR_REMOTE_ADDR, ctx.channel().remoteAddress())
          // Later handlers are expected to overwrite this.
          .set(GrpcAttributes.ATTR_SECURITY_LEVEL, SecurityLevel.NONE)
          .build();
      replaceProtocolNegotiationEvent(existingPne.withAttributes(attrs));
    }
  }

  /**
   * ProtocolNegotiationHandler is a convenience handler that makes it easy to follow the rules for
   * protocol negotiation.  Handlers should strongly consider extending this handler.
   */
  static class ProtocolNegotiationHandler extends ChannelDuplexHandler {

    private final ChannelHandler next;
    private final String negotiatorName;
    private ProtocolNegotiationEvent pne;
    private final ChannelLogger negotiationLogger;

    protected ProtocolNegotiationHandler(ChannelHandler next, String negotiatorName,
        ChannelLogger negotiationLogger) {
      this.next = Preconditions.checkNotNull(next, "next");
      this.negotiatorName = negotiatorName;
      this.negotiationLogger = Preconditions.checkNotNull(negotiationLogger, "negotiationLogger");
    }

    protected ProtocolNegotiationHandler(ChannelHandler next, ChannelLogger negotiationLogger) {
      this.next = Preconditions.checkNotNull(next, "next");
      this.negotiatorName = getClass().getSimpleName().replace("Handler", "");
      this.negotiationLogger = Preconditions.checkNotNull(negotiationLogger, "negotiationLogger");
    }

    @Override
    public final void handlerAdded(ChannelHandlerContext ctx) throws Exception {
      negotiationLogger.log(ChannelLogLevel.DEBUG, "{0} started", negotiatorName);
      handlerAdded0(ctx);
    }

    @ForOverride
    protected void handlerAdded0(ChannelHandlerContext ctx) throws Exception {
      super.handlerAdded(ctx);
    }

    @Override
    public final void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
      if (evt instanceof ProtocolNegotiationEvent) {
        checkState(pne == null, "pre-existing negotiation: %s < %s", pne, evt);
        pne = (ProtocolNegotiationEvent) evt;
        protocolNegotiationEventTriggered(ctx);
      } else {
        userEventTriggered0(ctx, evt);
      }
    }

    protected void userEventTriggered0(ChannelHandlerContext ctx, Object evt) throws Exception {
      super.userEventTriggered(ctx, evt);
    }

    @ForOverride
    protected void protocolNegotiationEventTriggered(ChannelHandlerContext ctx) {
      // no-op
    }

    protected final ProtocolNegotiationEvent getProtocolNegotiationEvent() {
      checkState(pne != null, "previous protocol negotiation event hasn't triggered");
      return pne;
    }

    protected final void replaceProtocolNegotiationEvent(ProtocolNegotiationEvent pne) {
      checkState(this.pne != null, "previous protocol negotiation event hasn't triggered");
      this.pne = Preconditions.checkNotNull(pne);
    }

    protected final void fireProtocolNegotiationEvent(ChannelHandlerContext ctx) {
      checkState(pne != null, "previous protocol negotiation event hasn't triggered");
      negotiationLogger.log(ChannelLogLevel.INFO, "{0} completed", negotiatorName);
      ctx.pipeline().replace(ctx.name(), /* newName= */ null, next);
      ctx.fireUserEventTriggered(pne);
    }
  }

  static final class SslEngineWrapper extends NoopSslEngine {
    private final SSLEngine sslEngine;
    private final String peerHost;

    SslEngineWrapper(SSLEngine sslEngine, String peerHost) {
      this.sslEngine = sslEngine;
      this.peerHost = peerHost;
    }

    @Override
    public String getPeerHost() {
      return peerHost;
    }

    @Override
    public SSLSession getHandshakeSession() {
      return new FakeSslSession(peerHost);
    }

    @Override
    public SSLParameters getSSLParameters() {
      return sslEngine.getSSLParameters();
    }
  }

  static final class FakeSslSession extends NoopSslSession {
    private final String peerHost;

    FakeSslSession(String peerHost) {
      this.peerHost = peerHost;
    }

    @Override
    public String getPeerHost() {
      return peerHost;
    }
  }
}

grpc / grpc-java / #20023

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