/**
* 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.hdfs.security.token.delegation;
//import org.apache.hadoop.classification.InterfaceAudience;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.Iterator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.Credentials;
import org.apache.hadoop.security.SecurityUtil;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager;
import org.apache.hadoop.security.token.delegation.DelegationKey;
/**
* A HDFS specific delegation token secret manager.
* The secret manager is responsible for generating and accepting the password
* for each token.
*/
//@InterfaceAudience.Private
public class DelegationTokenSecretManager
extends AbstractDelegationTokenSecretManager<DelegationTokenIdentifier> {
private static final Log LOG = LogFactory
.getLog(DelegationTokenSecretManager.class);
private final FSNamesystem namesystem;
/**
* Create a secret manager
* @param delegationKeyUpdateInterval the number of seconds for rolling new
* secret keys.
* @param delegationTokenMaxLifetime the maximum lifetime of the delegation
* tokens
* @param delegationTokenRenewInterval how often the tokens must be renewed
* @param delegationTokenRemoverScanInterval how often the tokens are scanned
* for expired tokens
*/
public DelegationTokenSecretManager(long delegationKeyUpdateInterval,
long delegationTokenMaxLifetime, long delegationTokenRenewInterval,
long delegationTokenRemoverScanInterval, FSNamesystem namesystem) {
super(delegationKeyUpdateInterval, delegationTokenMaxLifetime,
delegationTokenRenewInterval, delegationTokenRemoverScanInterval);
this.namesystem = namesystem;
}
@Override //SecretManager
public DelegationTokenIdentifier createIdentifier() {
return new DelegationTokenIdentifier();
}
/**
* Returns expiry time of a token given its identifier.
*
* @param dtId DelegationTokenIdentifier of a token
* @return Expiry time of the token
* @throws IOException
*/
public synchronized long getTokenExpiryTime(
DelegationTokenIdentifier dtId) throws IOException {
DelegationTokenInformation info = currentTokens.get(dtId);
if (info != null) {
return info.getRenewDate();
} else {
throw new IOException("No delegation token found for this identifier");
}
}
/**
* Load SecretManager state from fsimage.
*
* @param in input stream to read fsimage
* @throws IOException
*/
public synchronized void loadSecretManagerState(DataInputStream in)
throws IOException {
if (running) {
// a safety check
throw new IOException(
"Can't load state from image in a running SecretManager.");
}
currentId = in.readInt();
loadAllKeys(in);
delegationTokenSequenceNumber = in.readInt();
loadCurrentTokens(in);
}
/**
* Store the current state of the SecretManager for persistence
*
* @param out Output stream for writing into fsimage.
* @throws IOException
*/
public synchronized void saveSecretManagerState(DataOutputStream out)
throws IOException {
out.writeInt(currentId);
saveAllKeys(out);
out.writeInt(delegationTokenSequenceNumber);
saveCurrentTokens(out);
}
/**
* This method is intended to be used only while reading edit logs.
*
* @param identifier DelegationTokenIdentifier read from the edit logs or
* fsimage
*
* @param expiryTime token expiry time
* @throws IOException
*/
public synchronized void addPersistedDelegationToken(
DelegationTokenIdentifier identifier, long expiryTime) throws IOException {
if (running) {
// a safety check
throw new IOException(
"Can't add persisted delegation token to a running SecretManager.");
}
int keyId = identifier.getMasterKeyId();
DelegationKey dKey = allKeys.get(keyId);
if (dKey == null) {
LOG
.warn("No KEY found for persisted identifier "
+ identifier.toString());
return;
}
byte[] password = createPassword(identifier.getBytes(), dKey.getKey());
if (identifier.getSequenceNumber() > this.delegationTokenSequenceNumber) {
this.delegationTokenSequenceNumber = identifier.getSequenceNumber();
}
if (currentTokens.get(identifier) == null) {
currentTokens.put(identifier, new DelegationTokenInformation(expiryTime,
password));
} else {
throw new IOException(
"Same delegation token being added twice; invalid entry in fsimage or editlogs");
}
}
/**
* Add a MasterKey to the list of keys.
*
* @param key DelegationKey
* @throws IOException
*/
public synchronized void updatePersistedMasterKey(DelegationKey key)
throws IOException {
addKey(key);
}
/**
* Update the token cache with renewal record in edit logs.
*
* @param identifier DelegationTokenIdentifier of the renewed token
* @param expiryTime
* @throws IOException
*/
public synchronized void updatePersistedTokenRenewal(
DelegationTokenIdentifier identifier, long expiryTime) throws IOException {
if (running) {
// a safety check
throw new IOException(
"Can't update persisted delegation token renewal to a running SecretManager.");
}
DelegationTokenInformation info = null;
info = currentTokens.get(identifier);
if (info != null) {
int keyId = identifier.getMasterKeyId();
byte[] password = createPassword(identifier.getBytes(), allKeys
.get(keyId).getKey());
currentTokens.put(identifier, new DelegationTokenInformation(expiryTime,
password));
}
}
/**
* Update the token cache with the cancel record in edit logs
*
* @param identifier DelegationTokenIdentifier of the canceled token
* @throws IOException
*/
public synchronized void updatePersistedTokenCancellation(
DelegationTokenIdentifier identifier) throws IOException {
if (running) {
// a safety check
throw new IOException(
"Can't update persisted delegation token renewal to a running SecretManager.");
}
currentTokens.remove(identifier);
}
/**
* Returns the number of delegation keys currently stored.
* @return number of delegation keys
*/
public synchronized int getNumberOfKeys() {
return allKeys.size();
}
/**
* Private helper methods to save delegation keys and tokens in fsimage
*/
private synchronized void saveCurrentTokens(DataOutputStream out)
throws IOException {
out.writeInt(currentTokens.size());
Iterator<DelegationTokenIdentifier> iter = currentTokens.keySet()
.iterator();
while (iter.hasNext()) {
DelegationTokenIdentifier id = iter.next();
id.write(out);
DelegationTokenInformation info = currentTokens.get(id);
out.writeLong(info.getRenewDate());
}
}
/*
* Save the current state of allKeys
*/
private synchronized void saveAllKeys(DataOutputStream out)
throws IOException {
out.writeInt(allKeys.size());
Iterator<Integer> iter = allKeys.keySet().iterator();
while (iter.hasNext()) {
Integer key = iter.next();
allKeys.get(key).write(out);
}
}
/**
* Private helper methods to load Delegation tokens from fsimage
*/
private synchronized void loadCurrentTokens(DataInputStream in)
throws IOException {
int numberOfTokens = in.readInt();
for (int i = 0; i < numberOfTokens; i++) {
DelegationTokenIdentifier id = new DelegationTokenIdentifier();
id.readFields(in);
long expiryTime = in.readLong();
addPersistedDelegationToken(id, expiryTime);
}
}
/**
* Private helper method to load delegation keys from fsimage.
* @param in
* @throws IOException
*/
private synchronized void loadAllKeys(DataInputStream in) throws IOException {
int numberOfKeys = in.readInt();
for (int i = 0; i < numberOfKeys; i++) {
DelegationKey value = new DelegationKey();
value.readFields(in);
addKey(value);
}
}
/**
* Call namesystem to update editlogs for new master key.
*/
@Override //AbstractDelegationTokenManager
protected void logUpdateMasterKey(DelegationKey key)
throws IOException {
synchronized (noInterruptsLock) {
// The edit logging code will fail catastrophically if it
// is interrupted during a logSync, since the interrupt
// closes the edit log files. Doing this inside the
// above lock and then checking interruption status
// prevents this bug.
if (Thread.interrupted()) {
throw new InterruptedIOException(
"Interrupted before updating master key");
}
namesystem.logUpdateMasterKey(key);
}
}
/** A utility method for creating credentials. */
public static Credentials createCredentials(final NameNode namenode,
final UserGroupInformation ugi, final String renewer) throws IOException {
final Token<DelegationTokenIdentifier> token = namenode.getDelegationToken(
new Text(renewer));
if (token == null) {
throw new IOException("Failed to get the token for " + renewer
+ ", user=" + ugi.getShortUserName());
}
SecurityUtil.setTokenService(token, namenode.getNameNodeAddress());
final Credentials c = new Credentials();
c.addToken(new Text(ugi.getShortUserName()), token);
return c;
}
}