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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4280) Kerberos Authentication
Date Fri, 06 Jan 2017 01:34:01 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15803152#comment-15803152
] 

ASF GitHub Bot commented on DRILL-4280:
---------------------------------------

Github user sohami commented on a diff in the pull request:

    https://github.com/apache/drill/pull/578#discussion_r94825267
  
    --- 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 --
    
    I see SASL_FAILED status code can be send in multiple scenario like InvalidByteBuff (can
happen over network / bad client), null processor (which again can be because of above 2 reasons
if message is tampered) and in case when actually SASL exchange failed. First 2 cases doesn't
look like related to bad creds. Is it possible to segregate those and throw proper exception?
This can help client to know more about the problem rather than struggling with creds which
might not be an actual issue.


> Kerberos Authentication
> -----------------------
>
>                 Key: DRILL-4280
>                 URL: https://issues.apache.org/jira/browse/DRILL-4280
>             Project: Apache Drill
>          Issue Type: Improvement
>            Reporter: Keys Botzum
>            Assignee: Sudheesh Katkam
>              Labels: security
>
> Drill should support Kerberos based authentication from clients. This means that both
the ODBC and JDBC drivers as well as the web/REST interfaces should support inbound Kerberos.
For Web this would most likely be SPNEGO while for ODBC and JDBC this will be more generic
Kerberos.
> Since Hive and much of Hadoop supports Kerberos there is a potential for a lot of reuse
of ideas if not implementation.
> Note that this is related to but not the same as https://issues.apache.org/jira/browse/DRILL-3584




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