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From laurentgo <...@git.apache.org>
Subject [GitHub] drill pull request #578: DRILL-4280: Kerberos Authentication
Date Wed, 22 Feb 2017 00:57:35 GMT
Github user laurentgo commented on a diff in the pull request:

    https://github.com/apache/drill/pull/578#discussion_r102330939
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/rpc/security/plain/PlainFactory.java
---
    @@ -0,0 +1,166 @@
    +/**
    + * 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
    + * <p>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p>
    + * 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.plain;
    +
    +import org.apache.drill.common.config.DrillProperties;
    +import org.apache.drill.exec.rpc.security.AuthenticatorFactory;
    +import org.apache.drill.exec.rpc.security.FastSaslServerFactory;
    +import org.apache.drill.exec.rpc.security.FastSaslClientFactory;
    +import org.apache.drill.exec.rpc.user.security.UserAuthenticationException;
    +import org.apache.drill.exec.rpc.user.security.UserAuthenticator;
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.security.UserGroupInformation;
    +
    +import javax.security.auth.callback.Callback;
    +import javax.security.auth.callback.CallbackHandler;
    +import javax.security.auth.callback.NameCallback;
    +import javax.security.auth.callback.PasswordCallback;
    +import javax.security.auth.callback.UnsupportedCallbackException;
    +import javax.security.auth.login.LoginException;
    +import javax.security.sasl.AuthorizeCallback;
    +import javax.security.sasl.SaslClient;
    +import javax.security.sasl.SaslException;
    +import javax.security.sasl.SaslServer;
    +import java.io.IOException;
    +import java.security.Security;
    +import java.util.Map;
    +
    +public class PlainFactory implements AuthenticatorFactory {
    +  private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(PlainFactory.class);
    +
    +  public static final String SIMPLE_NAME = PlainServer.MECHANISM_NAME;
    +
    +  static {
    +    Security.addProvider(new PlainServer.PlainServerProvider());
    +  }
    +
    +  private final UserAuthenticator authenticator;
    +
    +  public PlainFactory() {
    +    this.authenticator = null;
    +  }
    +
    +  public PlainFactory(final UserAuthenticator authenticator) {
    +    this.authenticator = authenticator;
    +  }
    +
    +  @Override
    +  public String getSimpleName() {
    +    return SIMPLE_NAME;
    +  }
    +
    +  @Override
    +  public UserGroupInformation createAndLoginUser(Map<String, ?> properties) throws
IOException {
    +    final Configuration conf = new Configuration();
    +    UserGroupInformation.setConfiguration(conf);
    +    try {
    +      return UserGroupInformation.getCurrentUser();
    +    } catch (final IOException e) {
    +      logger.debug("Login failed.", e);
    +      final Throwable cause = e.getCause();
    +      if (cause instanceof LoginException) {
    +        throw new SaslException("Failed to login.", cause);
    +      }
    +      throw new SaslException("Unexpected failure trying to login. ", cause);
    +    }
    +  }
    +
    +  @Override
    +  public SaslServer createSaslServer(final UserGroupInformation ugi, final Map<String,
?> properties)
    +      throws SaslException {
    +    return FastSaslServerFactory.getInstance().createSaslServer(SIMPLE_NAME, null /**
protocol */,
    +        null /** serverName */, properties, new PlainServerCallbackHandler());
    +  }
    +
    +  @Override
    +  public SaslClient createSaslClient(final UserGroupInformation ugi, final Map<String,
?> properties)
    +      throws SaslException {
    +    final String userName = (String) properties.get(DrillProperties.USER);
    +    final String password = (String) properties.get(DrillProperties.PASSWORD);
    +
    +    return FastSaslClientFactory.getInstance().createSaslClient(new String[]{SIMPLE_NAME},
    +        null /** authorization ID */, null, null, properties, new CallbackHandler() {
    +          @Override
    +          public void handle(final Callback[] callbacks) throws IOException, UnsupportedCallbackException
{
    +            for (final Callback callback : callbacks) {
    +              if (callback instanceof NameCallback) {
    +                NameCallback.class.cast(callback).setName(userName);
    +                continue;
    +              }
    +              if (callback instanceof PasswordCallback) {
    +                PasswordCallback.class.cast(callback).setPassword(password.toCharArray());
    +                continue;
    +              }
    +              throw new UnsupportedCallbackException(callback);
    +            }
    +          }
    +        });
    +  }
    +
    +  @Override
    +  public void close() throws IOException {
    +    if (authenticator != null) {
    +      authenticator.close();
    +    }
    +  }
    +
    +  private class PlainServerCallbackHandler implements CallbackHandler {
    +
    +    @Override
    +    public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException
{
    +      NameCallback nameCallback = null;
    +      PasswordCallback passwordCallback = null;
    +      AuthorizeCallback authorizeCallback = null;
    +      for (final Callback callback : callbacks) {
    +        if (callback instanceof NameCallback) {
    +          nameCallback = NameCallback.class.cast(callback);
    +        } else if (callback instanceof PasswordCallback) {
    +          passwordCallback = PasswordCallback.class.cast(callback);
    +        } else if (callback instanceof AuthorizeCallback) {
    +          authorizeCallback = AuthorizeCallback.class.cast(callback);
    +        } else {
    +          throw new UnsupportedCallbackException(callback);
    +        }
    +      }
    +
    +      if (nameCallback == null || passwordCallback == null || authorizeCallback == null)
{
    +        throw new SaslException("Insufficient credentials.");
    +      }
    +
    +      try {
    +        assert authenticator != null;
    +        authenticator.authenticate(nameCallback.getName(), new String(passwordCallback.getPassword()));
    --- End diff --
    
    I don't believe callback is the right place to handle authentication. Unless I'm mistaken
about the security API, callbacks are designed to gather information, but the actual authentication
should happen inside the server `evaluateResponse` method. 
    In theory, someone could use the wrong `CallbackHandler` instance when calling `createSaslServer`,
which would result in no validation...


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