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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.token;
import javax.crypto.SecretKey;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Stoppable;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
import org.apache.hadoop.hbase.zookeeper.ZKClusterId;
import org.apache.hadoop.hbase.zookeeper.ZKLeaderManager;
import org.apache.hadoop.hbase.zookeeper.ZKUtil;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.token.SecretManager;
import org.apache.hadoop.security.token.Token;
import org.apache.zookeeper.KeeperException;
/**
* Manages an internal list of secret keys used to sign new authentication
* tokens as they are generated, and to valid existing tokens used for
* authentication.
*
*
* A single instance of {@code AuthenticationTokenSecretManager} will be
* running as the "leader" in a given HBase cluster. The leader is responsible
* for periodically generating new secret keys, which are then distributed to
* followers via ZooKeeper, and for expiring previously used secret keys that
* are no longer needed (as any tokens using them have expired).
*
*/
@InterfaceAudience.Private
@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="IS2_INCONSISTENT_SYNC",
justification="Complaint is about lastKeyUpdate... afraid to change it.")
public class AuthenticationTokenSecretManager
extends SecretManager {
static final String NAME_PREFIX = "SecretManager-";
private static final Log LOG = LogFactory.getLog(
AuthenticationTokenSecretManager.class);
private long lastKeyUpdate; // FindBugs: IS2_INCONSISTENT_SYNC FIX!!
private long keyUpdateInterval;
private long tokenMaxLifetime;
private ZKSecretWatcher zkWatcher;
private LeaderElector leaderElector;
private ZKClusterId clusterId;
private Map allKeys =
new ConcurrentHashMap();
private AuthenticationKey currentKey;
private int idSeq;
private AtomicLong tokenSeq = new AtomicLong();
private String name;
/**
* Create a new secret manager instance for generating keys.
* @param conf Configuration to use
* @param zk Connection to zookeeper for handling leader elections
* @param keyUpdateInterval Time (in milliseconds) between rolling a new master key for token signing
* @param tokenMaxLifetime Maximum age (in milliseconds) before a token expires and is no longer valid
*/
/* TODO: Restrict access to this constructor to make rogues instances more difficult.
* For the moment this class is instantiated from
* org.apache.hadoop.hbase.ipc.SecureServer so public access is needed.
*/
public AuthenticationTokenSecretManager(Configuration conf,
ZooKeeperWatcher zk, String serverName,
long keyUpdateInterval, long tokenMaxLifetime) {
this.zkWatcher = new ZKSecretWatcher(conf, zk, this);
this.keyUpdateInterval = keyUpdateInterval;
this.tokenMaxLifetime = tokenMaxLifetime;
this.leaderElector = new LeaderElector(zk, serverName);
this.name = NAME_PREFIX+serverName;
this.clusterId = new ZKClusterId(zk, zk);
}
public void start() {
try {
// populate any existing keys
this.zkWatcher.start();
// try to become leader
this.leaderElector.start();
} catch (KeeperException ke) {
LOG.error("Zookeeper initialization failed", ke);
}
}
public void stop() {
this.leaderElector.stop("SecretManager stopping");
}
public boolean isMaster() {
return leaderElector.isMaster();
}
public String getName() {
return name;
}
@Override
protected synchronized byte[] createPassword(AuthenticationTokenIdentifier identifier) {
long now = EnvironmentEdgeManager.currentTime();
AuthenticationKey secretKey = currentKey;
identifier.setKeyId(secretKey.getKeyId());
identifier.setIssueDate(now);
identifier.setExpirationDate(now + tokenMaxLifetime);
identifier.setSequenceNumber(tokenSeq.getAndIncrement());
return createPassword(identifier.getBytes(),
secretKey.getKey());
}
@Override
public byte[] retrievePassword(AuthenticationTokenIdentifier identifier)
throws InvalidToken {
long now = EnvironmentEdgeManager.currentTime();
if (identifier.getExpirationDate() < now) {
throw new InvalidToken("Token has expired");
}
AuthenticationKey masterKey = allKeys.get(identifier.getKeyId());
if(masterKey == null) {
if(zkWatcher.getWatcher().isAborted()) {
LOG.error("ZookeeperWatcher is abort");
throw new InvalidToken("Token keys could not be sync from zookeeper"
+ " because of ZookeeperWatcher abort");
}
synchronized (this) {
if (!leaderElector.isAlive() || leaderElector.isStopped()) {
LOG.warn("Thread leaderElector[" + leaderElector.getName() + ":"
+ leaderElector.getId() + "] is stoped or not alive");
leaderElector.start();
LOG.info("Thread leaderElector [" + leaderElector.getName() + ":"
+ leaderElector.getId() + "] is started");
}
}
zkWatcher.refreshKeys();
if (LOG.isDebugEnabled()) {
LOG.debug("Sync token keys from zookeeper");
}
masterKey = allKeys.get(identifier.getKeyId());
}
if (masterKey == null) {
throw new InvalidToken("Unknown master key for token (id="+
identifier.getKeyId()+")");
}
// regenerate the password
return createPassword(identifier.getBytes(),
masterKey.getKey());
}
@Override
public AuthenticationTokenIdentifier createIdentifier() {
return new AuthenticationTokenIdentifier();
}
public Token generateToken(String username) {
AuthenticationTokenIdentifier ident =
new AuthenticationTokenIdentifier(username);
Token token =
new Token(ident, this);
if (clusterId.hasId()) {
token.setService(new Text(clusterId.getId()));
}
return token;
}
public synchronized void addKey(AuthenticationKey key) throws IOException {
// ignore zk changes when running as master
if (leaderElector.isMaster()) {
if (LOG.isDebugEnabled()) {
LOG.debug("Running as master, ignoring new key "+key.getKeyId());
}
return;
}
if (LOG.isDebugEnabled()) {
LOG.debug("Adding key "+key.getKeyId());
}
allKeys.put(key.getKeyId(), key);
if (currentKey == null || key.getKeyId() > currentKey.getKeyId()) {
currentKey = key;
}
// update current sequence
if (key.getKeyId() > idSeq) {
idSeq = key.getKeyId();
}
}
synchronized boolean removeKey(Integer keyId) {
// ignore zk changes when running as master
if (leaderElector.isMaster()) {
if (LOG.isDebugEnabled()) {
LOG.debug("Running as master, ignoring removed key "+keyId);
}
return false;
}
if (LOG.isDebugEnabled()) {
LOG.debug("Removing key "+keyId);
}
allKeys.remove(keyId);
return true;
}
synchronized AuthenticationKey getCurrentKey() {
return currentKey;
}
AuthenticationKey getKey(int keyId) {
return allKeys.get(keyId);
}
synchronized void removeExpiredKeys() {
if (!leaderElector.isMaster()) {
LOG.info("Skipping removeExpiredKeys() because not running as master.");
return;
}
long now = EnvironmentEdgeManager.currentTime();
Iterator iter = allKeys.values().iterator();
while (iter.hasNext()) {
AuthenticationKey key = iter.next();
if (key.getExpiration() < now) {
if (LOG.isDebugEnabled()) {
LOG.debug("Removing expired key "+key.getKeyId());
}
iter.remove();
zkWatcher.removeKeyFromZK(key);
}
}
}
synchronized boolean isCurrentKeyRolled() {
return currentKey != null;
}
synchronized void rollCurrentKey() {
if (!leaderElector.isMaster()) {
LOG.info("Skipping rollCurrentKey() because not running as master.");
return;
}
long now = EnvironmentEdgeManager.currentTime();
AuthenticationKey prev = currentKey;
AuthenticationKey newKey = new AuthenticationKey(++idSeq,
Long.MAX_VALUE, // don't allow to expire until it's replaced by a new key
generateSecret());
allKeys.put(newKey.getKeyId(), newKey);
currentKey = newKey;
zkWatcher.addKeyToZK(newKey);
lastKeyUpdate = now;
if (prev != null) {
// make sure previous key is still stored
prev.setExpiration(now + tokenMaxLifetime);
allKeys.put(prev.getKeyId(), prev);
zkWatcher.updateKeyInZK(prev);
}
}
synchronized long getLastKeyUpdate() {
return lastKeyUpdate;
}
public static SecretKey createSecretKey(byte[] raw) {
return SecretManager.createSecretKey(raw);
}
private class LeaderElector extends Thread implements Stoppable {
private boolean stopped = false;
/** Flag indicating whether we're in charge of rolling/expiring keys */
private boolean isMaster = false;
private ZKLeaderManager zkLeader;
public LeaderElector(ZooKeeperWatcher watcher, String serverName) {
setDaemon(true);
setName("ZKSecretWatcher-leaderElector");
zkLeader = new ZKLeaderManager(watcher,
ZKUtil.joinZNode(zkWatcher.getRootKeyZNode(), "keymaster"),
Bytes.toBytes(serverName), this);
}
public boolean isMaster() {
return isMaster;
}
@Override
public boolean isStopped() {
return stopped;
}
@Override
public void stop(String reason) {
if (stopped) {
return;
}
stopped = true;
// prevent further key generation when stopping
if (isMaster) {
zkLeader.stepDownAsLeader();
}
isMaster = false;
LOG.info("Stopping leader election, because: "+reason);
interrupt();
}
public void run() {
zkLeader.start();
zkLeader.waitToBecomeLeader();
isMaster = true;
while (!stopped) {
long now = EnvironmentEdgeManager.currentTime();
// clear any expired
removeExpiredKeys();
long localLastKeyUpdate = getLastKeyUpdate();
if (localLastKeyUpdate + keyUpdateInterval < now) {
// roll a new master key
rollCurrentKey();
}
try {
Thread.sleep(5000);
} catch (InterruptedException ie) {
if (LOG.isDebugEnabled()) {
LOG.debug("Interrupted waiting for next update", ie);
}
}
}
}
}
}