Github user sudheeshkatkam commented on a diff in the pull request:
https://github.com/apache/drill/pull/578#discussion_r99898478
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/rpc/user/UserClientAuthenticationHandler.java
---
@@ -0,0 +1,229 @@
+/**
+ * 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.user;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.util.concurrent.SettableFuture;
+import com.google.protobuf.ByteString;
+import io.netty.buffer.ByteBuf;
+import org.apache.drill.exec.proto.UserProtos.RpcType;
+import org.apache.drill.exec.proto.UserProtos.SaslMessage;
+import org.apache.drill.exec.proto.UserProtos.SaslStatus;
+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 static com.google.common.base.Preconditions.checkNotNull;
+
+// package private
+class UserClientAuthenticationHandler implements
RpcOutcomeListener<SaslMessage> {
+ private static final org.slf4j.Logger logger =
+
org.slf4j.LoggerFactory.getLogger(UserClientAuthenticationHandler.class);
+
+ private static final ImmutableMap<SaslStatus, SaslChallengeProcessor>
CHALLENGE_PROCESSORS =
+ ImmutableMap.<SaslStatus, SaslChallengeProcessor>builder()
+ .put(SaslStatus.SASL_IN_PROGRESS, new SaslInProgressProcessor())
+ .put(SaslStatus.SASL_SUCCESS, new SaslSuccessProcessor())
+ .put(SaslStatus.SASL_FAILED, new SaslFailedProcessor())
+ .build();
+
+ private final UserClient client;
+ private final UserGroupInformation ugi;
+ private final SettableFuture<Void> settableFuture;
+
+ public UserClientAuthenticationHandler(UserClient client,
UserGroupInformation ugi,
+ SettableFuture<Void>
settableFuture) {
+ this.client = client;
+ this.ugi = ugi;
+ this.settableFuture = settableFuture;
+ }
+
+ public void initiate(final String mechanismName) {
+ try {
+ final ByteString responseData;
+ final SaslClient saslClient = client.getSaslClient();
+ if (saslClient.hasInitialResponse()) {
+ responseData = ByteString.copyFrom(evaluateChallenge(ugi,
saslClient, new byte[0]));
+ } else {
+ responseData = ByteString.EMPTY;
+ }
+ client.send(new UserClientAuthenticationHandler(client, ugi,
settableFuture),
+ RpcType.SASL_MESSAGE,
+ SaslMessage.newBuilder()
+ .setMechanism(mechanismName)
+ .setStatus(SaslStatus.SASL_START)
+ .setData(responseData)
+ .build(),
+ SaslMessage.class);
+ logger.trace("Initiated SASL exchange.");
+ } catch (final Exception e) {
+ settableFuture.setException(e);
+ }
+ }
+
+ @Override
+ public void failed(RpcException ex) {
+ settableFuture.setException(new SaslException("Unexpected failure",
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) {
+ settableFuture.setException(new SaslException("Server sent a corrupt
message."));
+ } else {
+ try {
+ final SaslChallengeContext context =
+ new SaslChallengeContext(value, client.getSaslClient(), ugi,
settableFuture);
+
+ final SaslMessage saslResponse = processor.process(context);
+
+ if (saslResponse != null) {
+ client.send(new UserClientAuthenticationHandler(client, ugi,
settableFuture),
+ RpcType.SASL_MESSAGE, saslResponse, SaslMessage.class,
+ true /** the connection will not be backed up at this point
*/);
+ } else {
+ // success
+ client.disposeSaslClient();
+ settableFuture.set(null);
+ }
+ } catch (final Exception e) {
+ try {
+ client.disposeSaslClient();
+ } catch (Exception ignored) {
+ //ignored
+ }
+ settableFuture.setException(e);
+ }
+ }
+ }
+
+ @Override
+ public void interrupted(InterruptedException e) {
+ settableFuture.setException(e);
+ }
+
+ private static class SaslChallengeContext {
+
+ final SaslMessage challenge;
+ final SaslClient saslClient;
+ final UserGroupInformation ugi;
+ final SettableFuture<Void> settableFuture;
+
+ public SaslChallengeContext(SaslMessage challenge, SaslClient
saslClient, UserGroupInformation ugi,
+ SettableFuture<Void> settableFuture) {
+ this.challenge = checkNotNull(challenge);
+ this.saslClient = checkNotNull(saslClient);
+ this.ugi = checkNotNull(ugi);
+ this.settableFuture = checkNotNull(settableFuture);
+ }
+ }
+
+ 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());
+ 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());
+ return null;
+ } else {
+ throw new SaslException("Server allegedly succeeded
authentication, but client did not. Suspicious?");
+ }
+ }
+ }
+ }
+
+ private static class SaslFailedProcessor implements
SaslChallengeProcessor {
+
+ @Override
+ public SaslMessage process(SaslChallengeContext context) throws
Exception {
+ throw new SaslException("Authentication failed. Incorrect
credentials?");
--- End diff --
Typically the client is not notified why auth failed, except that something
went wrong.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
