HDFS-17576. Support user defined auth Callback. (apache#6945)

Author: szetszwo

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsClientConfigKeys.java

@@ -236,6 +236,9 @@ public interface HdfsClientConfigKeys {
   String DFS_DATA_TRANSFER_SASL_PROPS_RESOLVER_CLASS_KEY =
       "dfs.data.transfer.saslproperties.resolver.class";
 
+  String DFS_DATA_TRANSFER_SASL_CUSTOMIZEDCALLBACKHANDLER_CLASS_KEY
+      = "dfs.data.transfer.sasl.CustomizedCallbackHandler.class";
+
   String DFS_ENCRYPT_DATA_TRANSFER_CIPHER_KEY_BITLENGTH_KEY =
       "dfs.encrypt.data.transfer.cipher.key.bitlength";
   int    DFS_ENCRYPT_DATA_TRANSFER_CIPHER_KEY_BITLENGTH_DEFAULT = 128;

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/sasl/DataTransferSaslUtil.java

@@ -102,9 +102,9 @@ public static void checkSaslComplete(SaslParticipant sasl,
     Set<String> requestedQop = ImmutableSet.copyOf(Arrays.asList(
         saslProps.get(Sasl.QOP).split(",")));
     String negotiatedQop = sasl.getNegotiatedQop();
-    LOG.debug("Verifying QOP, requested QOP = {}, negotiated QOP = {}",
-        requestedQop, negotiatedQop);
-    if (!requestedQop.contains(negotiatedQop)) {
+    LOG.debug("{}: Verifying QOP: requested = {}, negotiated = {}",
+        sasl, requestedQop, negotiatedQop);
+    if (negotiatedQop != null && !requestedQop.contains(negotiatedQop)) {
       throw new IOException(String.format("SASL handshake completed, but " +
           "channel does not have acceptable quality of protection, " +
           "requested = %s, negotiated = %s", requestedQop, negotiatedQop));

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/sasl/CustomizedCallbackHandler.java

@@ -0,0 +1,39 @@
+/*
+ * 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.hdfs.protocol.datatransfer.sasl;
+
+import javax.security.auth.callback.Callback;
+import javax.security.auth.callback.UnsupportedCallbackException;
+import java.io.IOException;
+import java.util.List;
+
+/** For handling customized {@link Callback}. */
+public interface CustomizedCallbackHandler {
+  class DefaultHandler implements CustomizedCallbackHandler{
+    @Override
+    public void handleCallback(List<Callback> callbacks, String username, char[] password)
+        throws UnsupportedCallbackException {
+      if (!callbacks.isEmpty()) {
+        throw new UnsupportedCallbackException(callbacks.get(0));
+      }
+    }
+  }
+
+  void handleCallback(List<Callback> callbacks, String name, char[] password)
+      throws UnsupportedCallbackException, IOException;
+}

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/sasl/SaslDataTransferServer.java

@@ -29,6 +29,7 @@
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 
@@ -46,6 +47,7 @@
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.crypto.CipherOption;
+import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.net.Peer;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.datatransfer.IOStreamPair;
@@ -178,7 +180,7 @@ private IOStreamPair getEncryptedStreams(Peer peer,
         dnConf.getEncryptionAlgorithm());
     }
 
-    CallbackHandler callbackHandler = new SaslServerCallbackHandler(
+    final CallbackHandler callbackHandler = new SaslServerCallbackHandler(dnConf.getConf(),
       new PasswordFunction() {
         @Override
         public char[] apply(String userName) throws IOException {
@@ -195,7 +197,7 @@ public char[] apply(String userName) throws IOException {
    * logic.  It's similar to a Guava Function, but we need to let it throw
    * exceptions.
    */
-  private interface PasswordFunction {
+  interface PasswordFunction {
 
     /**
      * Returns the SASL password for the given user name.
@@ -210,18 +212,27 @@ private interface PasswordFunction {
   /**
    * Sets user name and password when asked by the server-side SASL object.
    */
-  private static final class SaslServerCallbackHandler
+  static final class SaslServerCallbackHandler
       implements CallbackHandler {
-
     private final PasswordFunction passwordFunction;
+    private final CustomizedCallbackHandler customizedCallbackHandler;
 
     /**
      * Creates a new SaslServerCallbackHandler.
      *
      * @param passwordFunction for determing the user's password
      */
-    public SaslServerCallbackHandler(PasswordFunction passwordFunction) {
+    SaslServerCallbackHandler(Configuration conf, PasswordFunction passwordFunction) {
       this.passwordFunction = passwordFunction;
+
+      final Class<? extends CustomizedCallbackHandler> clazz = conf.getClass(
+          HdfsClientConfigKeys.DFS_DATA_TRANSFER_SASL_CUSTOMIZEDCALLBACKHANDLER_CLASS_KEY,
+          CustomizedCallbackHandler.DefaultHandler.class, CustomizedCallbackHandler.class);
+      try {
+        this.customizedCallbackHandler = clazz.newInstance();
+      } catch (Exception e) {
+        throw new IllegalStateException("Failed to create a new instance of " + clazz, e);
+      }
     }
 
     @Override
@@ -230,6 +241,7 @@ public void handle(Callback[] callbacks) throws IOException,
       NameCallback nc = null;
       PasswordCallback pc = null;
       AuthorizeCallback ac = null;
+      List<Callback> unknownCallbacks = null;
       for (Callback callback : callbacks) {
         if (callback instanceof AuthorizeCallback) {
           ac = (AuthorizeCallback) callback;
@@ -240,8 +252,10 @@ public void handle(Callback[] callbacks) throws IOException,
         } else if (callback instanceof RealmCallback) {
           continue; // realm is ignored
         } else {
-          throw new UnsupportedCallbackException(callback,
-              "Unrecognized SASL Callback: " + callback);
+          if (unknownCallbacks == null) {
+            unknownCallbacks = new ArrayList<>();
+          }
+          unknownCallbacks.add(callback);
         }
       }
 
@@ -253,6 +267,12 @@ public void handle(Callback[] callbacks) throws IOException,
         ac.setAuthorized(true);
         ac.setAuthorizedID(ac.getAuthorizationID());
       }
+
+      if (unknownCallbacks != null) {
+        final String name = nc != null ? nc.getDefaultName() : null;
+        final char[] password = name != null ? passwordFunction.apply(name) : null;
+        customizedCallbackHandler.handleCallback(unknownCallbacks, name, password);
+      }
     }
   }
 
@@ -298,7 +318,7 @@ private IOStreamPair getSaslStreams(Peer peer, OutputStream underlyingOut,
     Map<String, String> saslProps = saslPropsResolver.getServerProperties(
       getPeerAddress(peer));
 
-    CallbackHandler callbackHandler = new SaslServerCallbackHandler(
+    final CallbackHandler callbackHandler = new SaslServerCallbackHandler(dnConf.getConf(),
       new PasswordFunction() {
         @Override
         public char[] apply(String userName) throws IOException {

hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml

@@ -2641,6 +2641,15 @@
   </description>
 </property>
 
+<property>
+  <name>dfs.data.transfer.sasl.CustomizedCallbackHandler.class</name>
+  <value></value>
+  <description>
+    Some security provider may define a new javax.security.auth.callback.Callback.
+    This property allows users to configure a customized callback handler.
+  </description>
+</property>
+
 <property>
   <name>dfs.journalnode.rpc-address</name>
   <value>0.0.0.0:8485</value>

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocol/datatransfer/sasl/TestCustomizedCallbackHandler.java

@@ -0,0 +1,63 @@
+/*
+ * 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.hdfs.protocol.datatransfer.sasl;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
+import org.apache.hadoop.hdfs.protocol.datatransfer.sasl.SaslDataTransferServer.SaslServerCallbackHandler;
+import org.junit.Assert;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.security.auth.callback.Callback;
+import javax.security.auth.callback.UnsupportedCallbackException;
+import java.util.Arrays;
+import java.util.List;
+
+public class TestCustomizedCallbackHandler {
+  public static final Logger LOG = LoggerFactory.getLogger(TestCustomizedCallbackHandler.class);
+
+  static class MyCallback implements Callback { }
+
+  static class MyCallbackHandler implements CustomizedCallbackHandler {
+    @Override
+    public void handleCallback(List<Callback> callbacks, String name, char[] password) {
+      LOG.info("{}: handling {} for {}", getClass().getSimpleName(), callbacks, name);
+    }
+  }
+
+  @Test
+  public void testCustomizedCallbackHandler() throws Exception {
+    final Configuration conf = new Configuration();
+    final Callback[] callbacks = {new MyCallback()};
+
+    // without setting conf, expect UnsupportedCallbackException
+    try {
+      new SaslServerCallbackHandler(conf, String::toCharArray).handle(callbacks);
+      Assert.fail("Expected UnsupportedCallbackException for " + Arrays.asList(callbacks));
+    } catch (UnsupportedCallbackException e) {
+      LOG.info("The failure is expected", e);
+    }
+
+    // set conf and expect success
+    conf.setClass(HdfsClientConfigKeys.DFS_DATA_TRANSFER_SASL_CUSTOMIZEDCALLBACKHANDLER_CLASS_KEY,
+        MyCallbackHandler.class, CustomizedCallbackHandler.class);
+    new SaslServerCallbackHandler(conf, String::toCharArray).handle(callbacks);
+  }
+}