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/*
* 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.hadoop.hbase.security.visibility;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.exceptions.DeserializationException;
import org.apache.hadoop.hbase.protobuf.generated.VisibilityLabelsProtos.MultiUserAuthorizations;
import org.apache.hadoop.hbase.protobuf.generated.VisibilityLabelsProtos.UserAuthorizations;
import org.apache.hadoop.hbase.protobuf.generated.VisibilityLabelsProtos.VisibilityLabel;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.zookeeper.KeeperException;
/**
* Maintains the cache for visibility labels and also uses the zookeeper to update the labels in the
* system. The cache updation happens based on the data change event that happens on the zookeeper
* znode for labels table
*/
@InterfaceAudience.Private
public class VisibilityLabelsCache implements VisibilityLabelOrdinalProvider {
private static final Log LOG = LogFactory.getLog(VisibilityLabelsCache.class);
private static final int NON_EXIST_LABEL_ORDINAL = 0;
private static final List EMPTY_LIST = Collections.emptyList();
private static final Set EMPTY_SET = Collections.emptySet();
private static VisibilityLabelsCache instance;
private ZKVisibilityLabelWatcher zkVisibilityWatcher;
private Map labels = new HashMap();
private Map ordinalVsLabels = new HashMap();
private Map> userAuths = new HashMap>();
/**
* This covers the members labels, ordinalVsLabels and userAuths
*/
private ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
private VisibilityLabelsCache(ZooKeeperWatcher watcher, Configuration conf) throws IOException {
zkVisibilityWatcher = new ZKVisibilityLabelWatcher(watcher, this, conf);
try {
zkVisibilityWatcher.start();
} catch (KeeperException ke) {
LOG.error("ZooKeeper initialization failed", ke);
throw new IOException(ke);
}
}
/**
* Creates the singleton instance, if not yet present, and returns the same.
* @param watcher
* @param conf
* @return Singleton instance of VisibilityLabelsCache
* @throws IOException
*/
public synchronized static VisibilityLabelsCache createAndGet(ZooKeeperWatcher watcher,
Configuration conf) throws IOException {
// VisibilityLabelService#init() for different regions (in same RS) passes same instance of
// watcher as all get the instance from RS.
// watcher != instance.zkVisibilityWatcher.getWatcher() - This check is needed only in UTs with
// RS restart. It will be same JVM in which RS restarts and instance will be not null. But the
// watcher associated with existing instance will be stale as the restarted RS will have new
// watcher with it.
if (instance == null || watcher != instance.zkVisibilityWatcher.getWatcher()) {
instance = new VisibilityLabelsCache(watcher, conf);
}
return instance;
}
/**
* @return Singleton instance of VisibilityLabelsCache
* @throws IllegalStateException
* when this is called before calling
* {@link #createAndGet(ZooKeeperWatcher, Configuration)}
*/
public static VisibilityLabelsCache get() {
// By the time this method is called, the singleton instance of VisibilityLabelsCache should
// have been created.
if (instance == null) {
throw new IllegalStateException("VisibilityLabelsCache not yet instantiated");
}
return instance;
}
public void refreshLabelsCache(byte[] data) throws IOException {
List visibilityLabels = null;
try {
visibilityLabels = VisibilityUtils.readLabelsFromZKData(data);
} catch (DeserializationException dse) {
throw new IOException(dse);
}
this.lock.writeLock().lock();
try {
labels.clear();
ordinalVsLabels.clear();
for (VisibilityLabel visLabel : visibilityLabels) {
String label = Bytes.toString(visLabel.getLabel().toByteArray());
labels.put(label, visLabel.getOrdinal());
ordinalVsLabels.put(visLabel.getOrdinal(), label);
}
} finally {
this.lock.writeLock().unlock();
}
}
public void refreshUserAuthsCache(byte[] data) throws IOException {
MultiUserAuthorizations multiUserAuths = null;
try {
multiUserAuths = VisibilityUtils.readUserAuthsFromZKData(data);
} catch (DeserializationException dse) {
throw new IOException(dse);
}
this.lock.writeLock().lock();
try {
this.userAuths.clear();
for (UserAuthorizations userAuths : multiUserAuths.getUserAuthsList()) {
String user = Bytes.toString(userAuths.getUser().toByteArray());
this.userAuths.put(user, new HashSet(userAuths.getAuthList()));
}
} finally {
this.lock.writeLock().unlock();
}
}
/**
* @param label Not null label string
* @return The ordinal for the label. The ordinal starts from 1. Returns 0 when passed a non
* existing label.
*/
@Override
public int getLabelOrdinal(String label) {
Integer ordinal = null;
this.lock.readLock().lock();
try {
ordinal = labels.get(label);
} finally {
this.lock.readLock().unlock();
}
if (ordinal != null) {
return ordinal.intValue();
}
// 0 denotes not available
return NON_EXIST_LABEL_ORDINAL;
}
/**
* @param ordinal The ordinal of label which we are looking for.
* @return The label having the given ordinal. Returns null when no label exist in
* the system with given ordinal
*/
@Override
public String getLabel(int ordinal) {
this.lock.readLock().lock();
try {
return this.ordinalVsLabels.get(ordinal);
} finally {
this.lock.readLock().unlock();
}
}
/**
* @return The total number of visibility labels.
*/
public int getLabelsCount() {
this.lock.readLock().lock();
try {
return this.labels.size();
} finally {
this.lock.readLock().unlock();
}
}
public List getAuths(String user) {
List auths = EMPTY_LIST;
this.lock.readLock().lock();
try {
Set authOrdinals = userAuths.get(user);
if (authOrdinals != null) {
auths = new ArrayList(authOrdinals.size());
for (Integer authOrdinal : authOrdinals) {
auths.add(ordinalVsLabels.get(authOrdinal));
}
}
} finally {
this.lock.readLock().unlock();
}
return auths;
}
/**
* Returns the list of ordinals of authentications associated with the user
*
* @param user Not null value.
* @return the list of ordinals
*/
public Set getAuthsAsOrdinals(String user) {
this.lock.readLock().lock();
try {
Set auths = userAuths.get(user);
return (auths == null) ? EMPTY_SET : auths;
} finally {
this.lock.readLock().unlock();
}
}
public void writeToZookeeper(byte[] data, boolean labelsOrUserAuths) {
this.zkVisibilityWatcher.writeToZookeeper(data, labelsOrUserAuths);
}
}