server/base/src/main/java/org/apache/accumulo/server/security/handler/KerberosPermissionHandler.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.accumulo.server.security.handler;

import static java.nio.charset.StandardCharsets.UTF_8;

import java.util.Base64;

import org.apache.accumulo.core.client.AccumuloSecurityException;
import org.apache.accumulo.core.client.NamespaceNotFoundException;
import org.apache.accumulo.core.client.TableNotFoundException;
import org.apache.accumulo.core.client.impl.thrift.ThriftSecurityException;
import org.apache.accumulo.core.security.NamespacePermission;
import org.apache.accumulo.core.security.SystemPermission;
import org.apache.accumulo.core.security.TablePermission;
import org.apache.accumulo.core.security.thrift.TCredentials;

/**
 * Kerberos principals might contains identifiers that are not valid ZNodes ('/'). Base64-encodes the principals before interacting with ZooKeeper.
 */
public class KerberosPermissionHandler implements PermissionHandler {

  private final ZKPermHandler zkPermissionHandler;

  public KerberosPermissionHandler() {
    zkPermissionHandler = new ZKPermHandler();
  }

  @Override
  public void initialize(String instanceId, boolean initialize) {
    zkPermissionHandler.initialize(instanceId, initialize);
  }

  @Override
  public boolean validSecurityHandlers(Authenticator authent, Authorizor author) {
    return authent instanceof KerberosAuthenticator && author instanceof KerberosAuthorizor;
  }

  @Override
  public void initializeSecurity(TCredentials credentials, String rootuser) throws AccumuloSecurityException, ThriftSecurityException {
    zkPermissionHandler.initializeSecurity(credentials, Base64.getEncoder().encodeToString(rootuser.getBytes(UTF_8)));
  }

  @Override
  public boolean hasSystemPermission(String user, SystemPermission permission) throws AccumuloSecurityException {
    return zkPermissionHandler.hasSystemPermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), permission);
  }

  @Override
  public boolean hasCachedSystemPermission(String user, SystemPermission permission) throws AccumuloSecurityException {
    return zkPermissionHandler.hasCachedSystemPermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), permission);
  }

  @Override
  public boolean hasTablePermission(String user, String table, TablePermission permission) throws AccumuloSecurityException, TableNotFoundException {
    return zkPermissionHandler.hasTablePermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), table, permission);
  }

  @Override
  public boolean hasCachedTablePermission(String user, String table, TablePermission permission) throws AccumuloSecurityException, TableNotFoundException {
    return zkPermissionHandler.hasCachedTablePermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), table, permission);
  }

  @Override
  public boolean hasNamespacePermission(String user, String namespace, NamespacePermission permission) throws AccumuloSecurityException,
      NamespaceNotFoundException {
    return zkPermissionHandler.hasNamespacePermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), namespace, permission);
  }

  @Override
  public boolean hasCachedNamespacePermission(String user, String namespace, NamespacePermission permission) throws AccumuloSecurityException,
      NamespaceNotFoundException {
    return zkPermissionHandler.hasCachedNamespacePermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), namespace, permission);
  }

  @Override
  public void grantSystemPermission(String user, SystemPermission permission) throws AccumuloSecurityException {
    zkPermissionHandler.grantSystemPermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), permission);
  }

  @Override
  public void revokeSystemPermission(String user, SystemPermission permission) throws AccumuloSecurityException {
    zkPermissionHandler.revokeSystemPermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), permission);
  }

  @Override
  public void grantTablePermission(String user, String table, TablePermission permission) throws AccumuloSecurityException, TableNotFoundException {
    zkPermissionHandler.grantTablePermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), table, permission);
  }

  @Override
  public void revokeTablePermission(String user, String table, TablePermission permission) throws AccumuloSecurityException, TableNotFoundException {
    zkPermissionHandler.revokeTablePermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), table, permission);
  }

  @Override
  public void grantNamespacePermission(String user, String namespace, NamespacePermission permission) throws AccumuloSecurityException,
      NamespaceNotFoundException {
    zkPermissionHandler.grantNamespacePermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), namespace, permission);
  }

  @Override
  public void revokeNamespacePermission(String user, String namespace, NamespacePermission permission) throws AccumuloSecurityException,
      NamespaceNotFoundException {
    zkPermissionHandler.revokeNamespacePermission(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)), namespace, permission);
  }

  @Override
  public void cleanTablePermissions(String table) throws AccumuloSecurityException, TableNotFoundException {
    zkPermissionHandler.cleanTablePermissions(table);
  }

  @Override
  public void cleanNamespacePermissions(String namespace) throws AccumuloSecurityException, NamespaceNotFoundException {
    zkPermissionHandler.cleanNamespacePermissions(namespace);
  }

  @Override
  public void initUser(String user) throws AccumuloSecurityException {
    zkPermissionHandler.initUser(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)));
  }

  @Override
  public void initTable(String table) throws AccumuloSecurityException {
    zkPermissionHandler.initTable(table);
  }

  @Override
  public void cleanUser(String user) throws AccumuloSecurityException {
    zkPermissionHandler.cleanUser(Base64.getEncoder().encodeToString(user.getBytes(UTF_8)));
  }

}