sentry-binding/sentry-binding-hive/src/main/java/org/apache/sentry/binding/metastore/MetastoreAuthzBinding.java

/**
 * 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.sentry.binding.metastore;

import java.io.IOException;
import java.util.List;

import java.util.Set;
import javax.security.auth.login.LoginException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.metastore.api.InvalidOperationException;
import org.apache.hadoop.hive.ql.metadata.AuthorizationException;
import org.apache.hadoop.hive.ql.plan.HiveOperation;
import org.apache.sentry.core.common.exception.SentryUserException;
import org.apache.sentry.binding.hive.authz.HiveAuthzPrivilegesMap;
import org.apache.sentry.core.common.Subject;
import org.apache.sentry.core.model.db.DBModelAuthorizable;

/**
 * Sentry binding for Hive Metastore. The binding is integrated into Metastore
 * via the pre-event listener which are fired prior to executing the metadata
 * action. This point we are only authorizing metadata writes since the listners
 * are not fired from read events. Each action builds a input and output
 * hierarchy as per the objects used in the given operations. This is then
 * passed down to the hive binding which handles the authorization. This ensures
 * that we follow the same privilege model and policies.
 */
public class MetastoreAuthzBinding extends MetastoreAuthzBindingBase {

  public MetastoreAuthzBinding(Configuration config) throws Exception {
    super(config);
  }

  @Override
  protected void authorizeMetastoreAccess(HiveOperation hiveOp,
      Set<List<DBModelAuthorizable>> inputHierarchy,
      Set<List<DBModelAuthorizable>> outputHierarchy) throws InvalidOperationException {
    if (isSentryCacheOutOfSync()) {
      throw invalidOperationException(new SentryUserException(
          "Metastore/Sentry cache is out of sync"));
    }
    try {
      getHiveAuthzBinding().authorize(hiveOp, HiveAuthzPrivilegesMap
          .getHiveAuthzPrivileges(hiveOp), new Subject(getUserName()),
          inputHierarchy, outputHierarchy);
    } catch (AuthorizationException e1) {
      throw invalidOperationException(e1);
    } catch (LoginException e1) {
      throw invalidOperationException(e1);
    } catch (IOException e1) {
      throw invalidOperationException(e1);
    } catch (Exception e) {
      throw invalidOperationException(e);
    }
  }

}