CDPD-90798: HADOOP-19306. Support user defined auth Callback in SaslRpcServer. (apache#7140)

(cherry picked from commit 317db31)
(cherry picked from commit eaaa443b1284ca4c5dabf885c25ce15673cff2b3)
Change-Id: I00e2060977fd3cf7794ba67200524b2beb1f184f

Author: szetszwo

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java

@@ -736,6 +736,12 @@ public class CommonConfigurationKeysPublic {
    */
   public static final String  HADOOP_RPC_PROTECTION =
     "hadoop.rpc.protection";
+  public static final String HADOOP_SECURITY_SASL_MECHANISM_KEY
+      = "hadoop.security.sasl.mechanism";
+  public static final String HADOOP_SECURITY_SASL_MECHANISM_DEFAULT
+      = "DIGEST-MD5";
+  public static final String HADOOP_SECURITY_SASL_CUSTOMIZEDCALLBACKHANDLER_CLASS_KEY
+      = "hadoop.security.sasl.CustomizedCallbackHandler.class";
   /** Class to override Sasl Properties for a connection */
   public static final String  HADOOP_SECURITY_SASL_PROPS_RESOLVER_CLASS =
     "hadoop.security.saslproperties.resolver.class";

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java

@@ -106,7 +106,7 @@
 import org.apache.hadoop.ipc.protobuf.RpcHeaderProtos.RPCTraceInfoProto;
 import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.security.AccessControlException;
-import org.apache.hadoop.security.SaslConstants;
+import org.apache.hadoop.security.SaslMechanismFactory;
 import org.apache.hadoop.security.SaslPropertiesResolver;
 import org.apache.hadoop.security.SaslRpcServer;
 import org.apache.hadoop.security.SaslRpcServer.AuthMethod;
@@ -2144,6 +2144,10 @@ public Server getServer() {
       return Server.this;
     }
 
+    public Configuration getConf() {
+      return Server.this.getConf();
+    }
+
     /* Return true if the connection has no outstanding rpc */
     private boolean isIdle() {
       return rpcCount.get() == 0;
@@ -2607,7 +2611,7 @@ private RpcSaslProto buildSaslNegotiateResponse()
       // accelerate token negotiation by sending initial challenge
       // in the negotiation response
       if (enabledAuthMethods.contains(AuthMethod.TOKEN)
-          && SaslConstants.SASL_MECHANISM_DEFAULT.equals(AuthMethod.TOKEN.getMechanismName())) {
+          && SaslMechanismFactory.isDefaultMechanism(AuthMethod.TOKEN.getMechanismName())) {
         saslServer = createSaslServer(AuthMethod.TOKEN);
         byte[] challenge = saslServer.evaluateResponse(new byte[0]);
         RpcSaslProto.Builder negotiateBuilder =

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/sasl/CustomizedCallbackHandler.java renamed to hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/CustomizedCallbackHandler.java

@@ -15,23 +15,80 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs.protocol.datatransfer.sasl;
+package org.apache.hadoop.security;
+
+import org.apache.hadoop.conf.Configuration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import javax.security.auth.callback.Callback;
 import javax.security.auth.callback.UnsupportedCallbackException;
 import java.io.IOException;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 /** For handling customized {@link Callback}. */
 public interface CustomizedCallbackHandler {
-  class DefaultHandler implements CustomizedCallbackHandler{
+  Logger LOG = LoggerFactory.getLogger(CustomizedCallbackHandler.class);
+
+  class Cache {
+    private static final Map<String, CustomizedCallbackHandler> MAP = new HashMap<>();
+
+    private static synchronized CustomizedCallbackHandler getSynchronously(
+        String key, Configuration conf) {
+      //check again synchronously
+      final CustomizedCallbackHandler cached = MAP.get(key);
+      if (cached != null) {
+        return cached; //cache hit
+      }
+
+      //cache miss
+      final Class<?> clazz = conf.getClass(key, DefaultHandler.class);
+      LOG.info("{} = {}", key, clazz);
+      if (clazz == DefaultHandler.class) {
+        return DefaultHandler.INSTANCE;
+      }
+
+      final Object created;
+      try {
+        created = clazz.newInstance();
+      } catch (Exception e) {
+        LOG.warn("Failed to create a new instance of {}, fallback to {}",
+            clazz, DefaultHandler.class, e);
+        return DefaultHandler.INSTANCE;
+      }
+
+      final CustomizedCallbackHandler handler = created instanceof CustomizedCallbackHandler ?
+          (CustomizedCallbackHandler) created : CustomizedCallbackHandler.delegate(created);
+      MAP.put(key, handler);
+      return handler;
+    }
+
+    private static CustomizedCallbackHandler get(String key, Configuration conf) {
+      final CustomizedCallbackHandler cached = MAP.get(key);
+      return cached != null ? cached : getSynchronously(key, conf);
+    }
+
+    public static synchronized void clear() {
+      MAP.clear();
+    }
+
+    private Cache() { }
+  }
+
+  class DefaultHandler implements CustomizedCallbackHandler {
+    private static final DefaultHandler INSTANCE = new DefaultHandler();
+
     @Override
     public void handleCallbacks(List<Callback> callbacks, String username, char[] password)
         throws UnsupportedCallbackException {
       if (!callbacks.isEmpty()) {
-        throw new UnsupportedCallbackException(callbacks.get(0));
+        final Callback cb = callbacks.get(0);
+        throw new UnsupportedCallbackException(callbacks.get(0),
+            "Unsupported callback: " + (cb == null ? null : cb.getClass()));
       }
     }
   }
@@ -55,6 +112,10 @@ static CustomizedCallbackHandler delegate(Object delegated) {
     };
   }
 
+  static CustomizedCallbackHandler get(String key, Configuration conf) {
+    return Cache.get(key, conf);
+  }
+
   void handleCallbacks(List<Callback> callbacks, String name, char[] password)
       throws UnsupportedCallbackException, IOException;
 }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslConstants.java

@@ -0,0 +1,75 @@
+/*
+ * 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.security;
+
+import org.apache.hadoop.HadoopIllegalArgumentException;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_SASL_MECHANISM_DEFAULT;
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_SASL_MECHANISM_KEY;
+
+/**
+ * SASL related constants.
+ */
+@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce", "YARN", "HBase"})
+@InterfaceStability.Evolving
+public final class SaslMechanismFactory {
+  static final Logger LOG = LoggerFactory.getLogger(SaslMechanismFactory.class);
+
+  private static final String SASL_MECHANISM_ENV = "HADOOP_SASL_MECHANISM";
+  private static final String SASL_MECHANISM;
+
+  static {
+    // env
+    final String envValue = System.getenv(SASL_MECHANISM_ENV);
+    LOG.debug("{} = {} (env)", SASL_MECHANISM_ENV, envValue);
+
+    // conf
+    final Configuration conf = new Configuration(false);
+    final String confValue = conf.get(HADOOP_SECURITY_SASL_MECHANISM_KEY,
+        HADOOP_SECURITY_SASL_MECHANISM_DEFAULT);
+    LOG.debug("{} = {} (conf)", HADOOP_SECURITY_SASL_MECHANISM_KEY, confValue);
+
+    if (envValue != null && confValue != null) {
+      if (!envValue.equals(confValue)) {
+        throw new HadoopIllegalArgumentException("SASL Mechanism mismatched: env "
+            + SASL_MECHANISM_ENV + " is " + envValue + " but conf "
+            + HADOOP_SECURITY_SASL_MECHANISM_KEY + " is " + confValue);
+      }
+    }
+
+    SASL_MECHANISM = envValue != null ? envValue
+        : confValue != null ? confValue
+        : HADOOP_SECURITY_SASL_MECHANISM_DEFAULT;
+    LOG.debug("SASL_MECHANISM = {} (effective)", SASL_MECHANISM);
+  }
+
+  public static String getMechanism() {
+    return SASL_MECHANISM;
+  }
+
+  public static boolean isDefaultMechanism(String mechanism) {
+    return HADOOP_SECURITY_SASL_MECHANISM_DEFAULT.equals(mechanism);
+  }
+
+  private SaslMechanismFactory() {}
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslMechanismFactory.java

@@ -43,16 +43,16 @@
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.ipc.RetriableException;
 import org.apache.hadoop.ipc.Server;
 import org.apache.hadoop.ipc.Server.Connection;
-import org.apache.hadoop.ipc.StandbyException;
 import org.apache.hadoop.security.token.SecretManager;
 import org.apache.hadoop.security.token.SecretManager.InvalidToken;
 import org.apache.hadoop.security.token.TokenIdentifier;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_SASL_CUSTOMIZEDCALLBACKHANDLER_CLASS_KEY;
+
 /**
  * A utility class for dealing with SASL on RPC server
  */
@@ -223,8 +223,8 @@ public enum AuthMethod {
     SIMPLE((byte) 80, ""),
     KERBEROS((byte) 81, "GSSAPI"),
     @Deprecated
-    DIGEST((byte) 82, SaslConstants.SASL_MECHANISM),
-    TOKEN((byte) 82, SaslConstants.SASL_MECHANISM),
+    DIGEST((byte) 82, SaslMechanismFactory.getMechanism()),
+    TOKEN((byte) 82, SaslMechanismFactory.getMechanism()),
     PLAIN((byte) 83, "PLAIN");
 
     /** The code for this method. */
@@ -234,6 +234,8 @@ public enum AuthMethod {
     private AuthMethod(byte code, String mechanismName) { 
       this.code = code;
       this.mechanismName = mechanismName;
+      LOG.info("{} {}: code={}, mechanism=\"{}\"",
+          getClass().getSimpleName(), name(), code, mechanismName);
     }
 
     private static final int FIRST_CODE = values()[0].code;
@@ -276,28 +278,44 @@ public void write(DataOutput out) throws IOException {
   /** CallbackHandler for SASL mechanism. */
   @InterfaceStability.Evolving
   public static class SaslDigestCallbackHandler implements CallbackHandler {
+    private final CustomizedCallbackHandler customizedCallbackHandler;
     private SecretManager<TokenIdentifier> secretManager;
     private Server.Connection connection; 
 
     public SaslDigestCallbackHandler(
         SecretManager<TokenIdentifier> secretManager,
         Server.Connection connection) {
+      this(secretManager, connection, connection.getConf());
+    }
+
+    public SaslDigestCallbackHandler(
+        SecretManager<TokenIdentifier> secretManager,
+        Server.Connection connection,
+        Configuration conf) {
       this.secretManager = secretManager;
       this.connection = connection;
+      this.customizedCallbackHandler = CustomizedCallbackHandler.get(
+          HADOOP_SECURITY_SASL_CUSTOMIZEDCALLBACKHANDLER_CLASS_KEY, conf);
     }
 
-    private char[] getPassword(TokenIdentifier tokenid) throws InvalidToken,
-        StandbyException, RetriableException, IOException {
+    private char[] getPassword(TokenIdentifier tokenid) throws IOException {
       return encodePassword(secretManager.retriableRetrievePassword(tokenid));
     }
 
+    private char[] getPassword(String name) throws IOException {
+      final TokenIdentifier tokenIdentifier = getIdentifier(name, secretManager);
+      final UserGroupInformation user = tokenIdentifier.getUser();
+      connection.attemptingUser = user;
+      LOG.debug("SASL server callback: setting password for client: {}", user);
+      return getPassword(tokenIdentifier);
+    }
+
     @Override
-    public void handle(Callback[] callbacks) throws InvalidToken,
-        UnsupportedCallbackException, StandbyException, RetriableException,
-        IOException {
+    public void handle(Callback[] callbacks) throws UnsupportedCallbackException, 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;
@@ -308,20 +326,14 @@ public void handle(Callback[] callbacks) throws InvalidToken,
         } else if (callback instanceof RealmCallback) {
           continue; // realm is ignored
         } else {
-          throw new UnsupportedCallbackException(callback,
-              "Unrecognized SASL Callback");
+          if (unknownCallbacks == null) {
+            unknownCallbacks = new ArrayList<>();
+          }
+          unknownCallbacks.add(callback);
         }
       }
       if (pc != null) {
-        TokenIdentifier tokenIdentifier = getIdentifier(nc.getDefaultName(),
-            secretManager);
-        char[] password = getPassword(tokenIdentifier);
-        UserGroupInformation user = null;
-        user = tokenIdentifier.getUser(); // may throw exception
-        connection.attemptingUser = user;
-
-        LOG.debug("SASL server callback: setting password for client: {}", user);
-        pc.setPassword(password);
+        pc.setPassword(getPassword(nc.getDefaultName()));
       }
       if (ac != null) {
         String authid = ac.getAuthenticationID();
@@ -341,6 +353,11 @@ public void handle(Callback[] callbacks) throws InvalidToken,
           ac.setAuthorizedID(authzid);
         }
       }
+      if (unknownCallbacks != null) {
+        final String name = nc != null ? nc.getDefaultName() : null;
+        final char[] password = name != null ? getPassword(name) : null;
+        customizedCallbackHandler.handleCallbacks(unknownCallbacks, name, password);
+      }
     }
   }