HBASE-27923 NettyRpcServer may hange if it should skip initial sasl h…

hbase-client/src/main/java/org/apache/hadoop/hbase/security/NettyHBaseSaslRpcClientHandler.java

@@ -94,16 +94,20 @@ private void tryComplete(ChannelHandlerContext ctx) {
     if (LOG.isTraceEnabled()) {
       LOG.trace("SASL negotiation for {} is complete", provider.getSaslAuthMethod().getName());
     }
-    ChannelPipeline p = ctx.pipeline();
-    saslRpcClient.setupSaslHandler(p, HANDLER_NAME);
-    p.remove(SaslChallengeDecoder.class);
-    p.remove(this);
+    saslRpcClient.setupSaslHandler(ctx.pipeline(), HANDLER_NAME);
+    removeHandlers(ctx);
 
     setCryptoAESOption();
 
     saslPromise.setSuccess(true);
   }
 
+  private void removeHandlers(ChannelHandlerContext ctx) {
+    ChannelPipeline p = ctx.pipeline();
+    p.remove(SaslChallengeDecoder.class);
+    p.remove(this);
+  }
+
   private void setCryptoAESOption() {
     boolean saslEncryptionEnabled = SaslUtil.QualityOfProtection.PRIVACY.getSaslQop()
       .equalsIgnoreCase(saslRpcClient.getSaslQOP());
@@ -158,6 +162,9 @@ protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Excep
       } else {
         saslPromise.tryFailure(new FallbackDisallowedException());
       }
+      // When we switch to simple auth, we should also remove SaslChallengeDecoder and
+      // NettyHBaseSaslRpcClientHandler.
+      removeHandlers(ctx);
       return;
     }
     LOG.trace("Reading input token size={} for processing by initSASLContext", len);

hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyHBaseSaslRpcServerHandler.java

@@ -89,9 +89,11 @@ protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Excep
       boolean useWrap = qop != null && !"auth".equalsIgnoreCase(qop);
       ChannelPipeline p = ctx.pipeline();
       if (useWrap) {
-        p.addBefore(DECODER_NAME, null, new SaslWrapHandler(saslServer::wrap)).addLast(
-          new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4),
-          new SaslUnwrapHandler(saslServer::unwrap));
+        p.addBefore(DECODER_NAME, null, new SaslWrapHandler(saslServer::wrap))
+          .addBefore(NettyRpcServerResponseEncoder.NAME, null,
+            new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4))
+          .addBefore(NettyRpcServerResponseEncoder.NAME, null,
+            new SaslUnwrapHandler(saslServer::unwrap));
       }
       conn.setupHandler();
       p.remove(this);

hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcServer.java

@@ -125,7 +125,11 @@ protected void initChannel(Channel ch) throws Exception {
             initSSL(pipeline, conf.getBoolean(HBASE_SERVER_NETTY_TLS_SUPPORTPLAINTEXT, true));
           }
           pipeline.addLast(NettyRpcServerPreambleHandler.DECODER_NAME, preambleDecoder)
-            .addLast(createNettyRpcServerPreambleHandler());
+            .addLast(createNettyRpcServerPreambleHandler())
+            // We need NettyRpcServerResponseEncoder here because NettyRpcServerPreambleHandler may
+            // send RpcResponse to client.
+            .addLast(NettyRpcServerResponseEncoder.NAME,
+              new NettyRpcServerResponseEncoder(metrics));
         }
       });
     try {

hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcServerPreambleHandler.java

@@ -58,8 +58,9 @@ protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Excep
       LengthFieldBasedFrameDecoder decoder =
         new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4);
       decoder.setSingleDecode(true);
-      p.addLast(NettyHBaseSaslRpcServerHandler.DECODER_NAME, decoder);
-      p.addLast(new NettyHBaseSaslRpcServerHandler(rpcServer, conn));
+      p.addBefore(NettyRpcServerResponseEncoder.NAME, NettyHBaseSaslRpcServerHandler.DECODER_NAME,
+        decoder).addBefore(NettyRpcServerResponseEncoder.NAME, null,
+          new NettyHBaseSaslRpcServerHandler(rpcServer, conn));
     } else {
       conn.setupHandler();
     }

hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcServerResponseEncoder.java

@@ -31,6 +31,8 @@
 @InterfaceAudience.Private
 class NettyRpcServerResponseEncoder extends ChannelOutboundHandlerAdapter {
 
+  static final String NAME = "NettyRpcServerResponseEncoder";
+
   private final MetricsHBaseServer metrics;
 
   NettyRpcServerResponseEncoder(MetricsHBaseServer metrics) {

hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyServerRpcConnection.java

@@ -71,9 +71,10 @@ class NettyServerRpcConnection extends ServerRpcConnection {
 
   void setupHandler() {
     channel.pipeline()
-      .addLast("frameDecoder", new NettyRpcFrameDecoder(rpcServer.maxRequestSize, this))
-      .addLast("decoder", new NettyRpcServerRequestDecoder(rpcServer.metrics, this))
-      .addLast("encoder", new NettyRpcServerResponseEncoder(rpcServer.metrics));
+      .addBefore(NettyRpcServerResponseEncoder.NAME, "frameDecoder",
+        new NettyRpcFrameDecoder(rpcServer.maxRequestSize, this))
+      .addBefore(NettyRpcServerResponseEncoder.NAME, "decoder",
+        new NettyRpcServerRequestDecoder(rpcServer.metrics, this));
   }
 
   void process(ByteBuf buf) throws IOException, InterruptedException {
@@ -115,6 +116,6 @@ public NettyServerCall createCall(int id, final BlockingService service,
 
   @Override
   protected void doRespond(RpcResponse resp) {
-    channel.writeAndFlush(resp);
+    NettyFutureUtils.safeWriteAndFlush(channel, resp);
   }
 }

hbase-server/src/test/java/org/apache/hadoop/hbase/ipc/TestRpcSkipInitialSaslHandshake.java

@@ -0,0 +1,176 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF 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
+ *
+ *     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 org.apache.hadoop.hbase.ipc;
+
+import static org.apache.hadoop.hbase.ipc.TestProtobufRpcServiceImpl.SERVICE;
+import static org.apache.hadoop.hbase.ipc.TestProtobufRpcServiceImpl.newBlockingStub;
+import static org.apache.hadoop.hbase.security.HBaseKerberosUtils.getKeytabFileForTesting;
+import static org.apache.hadoop.hbase.security.HBaseKerberosUtils.getPrincipalForTesting;
+import static org.apache.hadoop.hbase.security.HBaseKerberosUtils.loginKerberosPrincipal;
+import static org.apache.hadoop.hbase.security.HBaseKerberosUtils.setSecuredConfiguration;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.net.InetSocketAddress;
+import java.util.concurrent.atomic.AtomicBoolean;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.HBaseTestingUtil;
+import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.security.HBaseKerberosUtils;
+import org.apache.hadoop.hbase.security.SecurityInfo;
+import org.apache.hadoop.hbase.security.User;
+import org.apache.hadoop.hbase.testclassification.MediumTests;
+import org.apache.hadoop.hbase.testclassification.RPCTests;
+import org.apache.hadoop.minikdc.MiniKdc;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+import org.mockito.Mockito;
+
+import org.apache.hbase.thirdparty.com.google.common.collect.Lists;
+import org.apache.hbase.thirdparty.io.netty.buffer.ByteBuf;
+import org.apache.hbase.thirdparty.io.netty.channel.Channel;
+import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext;
+
+import org.apache.hadoop.hbase.shaded.ipc.protobuf.generated.TestProtos;
+import org.apache.hadoop.hbase.shaded.ipc.protobuf.generated.TestRpcServiceProtos.TestProtobufRpcProto.BlockingInterface;
+
+@Category({ RPCTests.class, MediumTests.class })
+public class TestRpcSkipInitialSaslHandshake {
+
+  @ClassRule
+  public static final HBaseClassTestRule CLASS_RULE =
+    HBaseClassTestRule.forClass(TestRpcSkipInitialSaslHandshake.class);
+
+  protected static final HBaseTestingUtil TEST_UTIL = new HBaseTestingUtil();
+
+  protected static final File KEYTAB_FILE =
+    new File(TEST_UTIL.getDataTestDir("keytab").toUri().getPath());
+
+  protected static MiniKdc KDC;
+  protected static String HOST = "localhost";
+  protected static String PRINCIPAL;
+
+  protected String krbKeytab;
+  protected String krbPrincipal;
+  protected UserGroupInformation ugi;
+  protected Configuration clientConf;
+  protected Configuration serverConf;
+
+  protected static void initKDCAndConf() throws Exception {
+    KDC = TEST_UTIL.setupMiniKdc(KEYTAB_FILE);
+    PRINCIPAL = "hbase/" + HOST;
+    KDC.createPrincipal(KEYTAB_FILE, PRINCIPAL);
+    HBaseKerberosUtils.setPrincipalForTesting(PRINCIPAL + "@" + KDC.getRealm());
+    // set a smaller timeout and retry to speed up tests
+    TEST_UTIL.getConfiguration().setInt(RpcClient.SOCKET_TIMEOUT_READ, 2000000000);
+    TEST_UTIL.getConfiguration().setInt("hbase.security.relogin.maxretries", 1);
+  }
+
+  protected static void stopKDC() throws InterruptedException {
+    if (KDC != null) {
+      KDC.stop();
+    }
+  }
+
+  protected final void setUpPrincipalAndConf() throws Exception {
+    krbKeytab = getKeytabFileForTesting();
+    krbPrincipal = getPrincipalForTesting();
+    ugi = loginKerberosPrincipal(krbKeytab, krbPrincipal);
+    clientConf = new Configuration(TEST_UTIL.getConfiguration());
+    setSecuredConfiguration(clientConf);
+    clientConf.setBoolean(RpcClient.IPC_CLIENT_FALLBACK_TO_SIMPLE_AUTH_ALLOWED_KEY, true);
+    serverConf = new Configuration(TEST_UTIL.getConfiguration());
+  }
+
+  @BeforeClass
+  public static void setUp() throws Exception {
+    initKDCAndConf();
+  }
+
+  @AfterClass
+  public static void tearDown() throws Exception {
+    stopKDC();
+    TEST_UTIL.cleanupTestDir();
+  }
+
+  @Before
+  public void setUpTest() throws Exception {
+    setUpPrincipalAndConf();
+  }
+
+  /**
+   * This test is for HBASE-27923,which NettyRpcServer may hange if it should skip initial sasl
+   * handshake.
+   */
+  @Test
+  public void test() throws Exception {
+    SecurityInfo securityInfoMock = Mockito.mock(SecurityInfo.class);
+    Mockito.when(securityInfoMock.getServerPrincipal())
+      .thenReturn(HBaseKerberosUtils.KRB_PRINCIPAL);
+    SecurityInfo.addInfo("TestProtobufRpcProto", securityInfoMock);
+
+    final AtomicBoolean useSasl = new AtomicBoolean(false);
+    NettyRpcServer rpcServer = new NettyRpcServer(null, getClass().getSimpleName(),
+      Lists.newArrayList(new RpcServer.BlockingServiceAndInterface(SERVICE, null)),
+      new InetSocketAddress(HOST, 0), serverConf, new FifoRpcScheduler(serverConf, 1), true) {
+
+      @Override
+      protected NettyRpcServerPreambleHandler createNettyRpcServerPreambleHandler() {
+        return new NettyRpcServerPreambleHandler(this) {
+          private NettyServerRpcConnection conn;
+
+          @Override
+          protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
+            super.channelRead0(ctx, msg);
+            useSasl.set(conn.useSasl);
+
+          }
+
+          @Override
+          protected NettyServerRpcConnection createNettyServerRpcConnection(Channel channel) {
+            conn = super.createNettyServerRpcConnection(channel);
+            return conn;
+          }
+        };
+      }
+    };
+
+    rpcServer.start();
+    try (NettyRpcClient rpcClient =
+      new NettyRpcClient(clientConf, HConstants.DEFAULT_CLUSTER_ID.toString(), null, null)) {
+      BlockingInterface stub = newBlockingStub(rpcClient, rpcServer.getListenerAddress(),
+        User.create(UserGroupInformation.getCurrentUser()));
+
+      String response =
+        stub.echo(null, TestProtos.EchoRequestProto.newBuilder().setMessage("test").build())
+          .getMessage();
+      assertTrue("test".equals(response));
+      assertFalse(useSasl.get());
+
+    } finally {
+      rpcServer.stop();
+    }
+  }
+}