Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/578#discussion_r102391859
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/rpc/security/AuthenticationOutcomeListener.java
---
@@ -0,0 +1,238 @@
+/**
+ * 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.drill.exec.rpc.security;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Maps;
+import com.google.protobuf.ByteString;
+import com.google.protobuf.Internal.EnumLite;
+import com.google.protobuf.MessageLite;
+import io.netty.buffer.ByteBuf;
+import org.apache.drill.exec.proto.UserBitShared.SaslMessage;
+import org.apache.drill.exec.proto.UserBitShared.SaslStatus;
+import org.apache.drill.exec.rpc.BasicClient;
+import org.apache.drill.exec.rpc.ClientConnection;
+import org.apache.drill.exec.rpc.RpcException;
+import org.apache.drill.exec.rpc.RpcOutcomeListener;
+import org.apache.hadoop.security.UserGroupInformation;
+
+import javax.security.sasl.SaslClient;
+import javax.security.sasl.SaslException;
+import java.io.IOException;
+import java.lang.reflect.UndeclaredThrowableException;
+import java.security.PrivilegedExceptionAction;
+import java.util.EnumMap;
+import java.util.Map;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+public class AuthenticationOutcomeListener<T extends EnumLite, R extends
ClientConnection,
+ HANDSHAKE_SEND extends MessageLite, HANDSHAKE_RESPONSE extends
MessageLite>
+ implements RpcOutcomeListener<SaslMessage> {
+ private static final org.slf4j.Logger logger =
+
org.slf4j.LoggerFactory.getLogger(AuthenticationOutcomeListener.class);
+
+ private static final ImmutableMap<SaslStatus, SaslChallengeProcessor>
CHALLENGE_PROCESSORS;
+ static {
+ final Map<SaslStatus, SaslChallengeProcessor> map = new
EnumMap<>(SaslStatus.class);
+ map.put(SaslStatus.SASL_IN_PROGRESS, new SaslInProgressProcessor());
+ map.put(SaslStatus.SASL_SUCCESS, new SaslSuccessProcessor());
+ map.put(SaslStatus.SASL_FAILED, new SaslFailedProcessor());
+ CHALLENGE_PROCESSORS = Maps.immutableEnumMap(map);
+ }
+
+ private final BasicClient<T, R, HANDSHAKE_SEND, HANDSHAKE_RESPONSE>
client;
+ private final R connection;
+ private final T saslRpcType;
+ private final UserGroupInformation ugi;
+ private final RpcOutcomeListener<?> rpcOutcomeListener;
+
+ public AuthenticationOutcomeListener(BasicClient<T, R, HANDSHAKE_SEND,
HANDSHAKE_RESPONSE> client,
+ R connection, T saslRpcType,
UserGroupInformation ugi,
+ RpcOutcomeListener<?>
rpcOutcomeListener) {
+ this.client = client;
+ this.connection = connection;
+ this.saslRpcType = saslRpcType;
+ this.ugi = ugi;
+ this.rpcOutcomeListener = rpcOutcomeListener;
+ }
+
+ public void initiate(final String mechanismName) {
+ logger.trace("Initiating SASL exchange.");
+ try {
+ final ByteString responseData;
+ final SaslClient saslClient = connection.getSaslClient();
+ if (saslClient.hasInitialResponse()) {
+ responseData = ByteString.copyFrom(evaluateChallenge(ugi,
saslClient, new byte[0]));
+ } else {
+ responseData = ByteString.EMPTY;
+ }
+ client.send(new AuthenticationOutcomeListener<>(client, connection,
saslRpcType, ugi, rpcOutcomeListener),
+ connection,
+ saslRpcType,
+ SaslMessage.newBuilder()
+ .setMechanism(mechanismName)
+ .setStatus(SaslStatus.SASL_START)
+ .setData(responseData)
+ .build(),
+ SaslMessage.class,
+ true /** the connection will not be backed up at this point */);
+ logger.trace("Initiated SASL exchange.");
+ } catch (final Exception e) {
+ rpcOutcomeListener.failed(RpcException.mapException(e));
+ }
+ }
+
+ @Override
+ public void failed(RpcException ex) {
+ rpcOutcomeListener.failed(RpcException.mapException(ex));
+ }
+
+ @Override
+ public void success(SaslMessage value, ByteBuf buffer) {
+ logger.trace("Server responded with message of type: {}",
value.getStatus());
+ final SaslChallengeProcessor processor =
CHALLENGE_PROCESSORS.get(value.getStatus());
+ if (processor == null) {
+ rpcOutcomeListener.failed(RpcException.mapException(
+ new SaslException("Server sent a corrupt message.")));
+ } else {
+ try {
+ final SaslChallengeContext context = new
SaslChallengeContext(value, connection.getSaslClient(), ugi);
+
+ final SaslMessage saslResponse = processor.process(context);
+
+ if (saslResponse != null) {
+ client.send(new AuthenticationOutcomeListener<>(client,
connection, saslRpcType, ugi, rpcOutcomeListener),
+ connection, saslRpcType, saslResponse, SaslMessage.class,
+ true /** the connection will not be backed up at this point
*/);
+ } else {
+ // success
+ rpcOutcomeListener.success(null, null);
+ }
+ } catch (final Exception e) {
+ rpcOutcomeListener.failed(RpcException.mapException(e));
+ }
+ }
+ }
+
+ @Override
+ public void interrupted(InterruptedException e) {
+ rpcOutcomeListener.interrupted(e);
+ }
+
+ private static class SaslChallengeContext {
+
+ final SaslMessage challenge;
+ final SaslClient saslClient;
+ final UserGroupInformation ugi;
+
+ public SaslChallengeContext(SaslMessage challenge, SaslClient
saslClient, UserGroupInformation ugi) {
+ this.challenge = checkNotNull(challenge);
+ this.saslClient = checkNotNull(saslClient);
+ this.ugi = checkNotNull(ugi);
+ }
+ }
+
+ private interface SaslChallengeProcessor {
+
+ /**
+ * Process challenge from server, and return a response.
+ *
+ * Returns null iff SASL exchange is complete and successful.
+ *
+ * @param context challenge context
+ * @return response
+ * @throws Exception
+ */
+ SaslMessage process(SaslChallengeContext context) throws Exception;
+
+ }
+
+ private static class SaslInProgressProcessor implements
SaslChallengeProcessor {
+
+ @Override
+ public SaslMessage process(SaslChallengeContext context) throws
Exception {
+ final SaslMessage.Builder response = SaslMessage.newBuilder();
+
+ final byte[] responseBytes = evaluateChallenge(context.ugi,
context.saslClient,
+ context.challenge.getData().toByteArray());
+
+ final boolean isComplete = context.saslClient.isComplete();
+ logger.trace("Evaluated challenge. Completed? {}.", isComplete);
+ response.setData(responseBytes != null ?
ByteString.copyFrom(responseBytes) : ByteString.EMPTY);
+ // if isComplete, the client will get one more response from server
+ response.setStatus(isComplete ? SaslStatus.SASL_SUCCESS :
SaslStatus.SASL_IN_PROGRESS);
+ return response.build();
+ }
+ }
+
+ private static class SaslSuccessProcessor implements
SaslChallengeProcessor {
+
+ @Override
+ public SaslMessage process(SaslChallengeContext context) throws
Exception {
+ if (context.saslClient.isComplete()) {
+ logger.trace("Successfully authenticated to server using {}",
context.saslClient.getMechanismName());
+ // setup security layers here..
+ return null;
+ } else {
+
+ // server completed before client; so try once, fail otherwise
+ evaluateChallenge(context.ugi, context.saslClient,
+ context.challenge.getData().toByteArray()); // discard response
+
+ if (context.saslClient.isComplete()) {
+ logger.trace("Successfully authenticated to server using {}",
context.saslClient.getMechanismName());
+ // setup security layers here..
+ return null;
--- End diff --
After authentication, the saslClient object can be used for encryption and
integrity checks for future requests and responses on the connection (@sohami
is working on this feature).
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