/**
* 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.mapreduce.security;
import java.io.IOException;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Master;
import org.apache.hadoop.mapreduce.MRJobConfig;
import org.apache.hadoop.mapreduce.security.token.JobTokenIdentifier;
import org.apache.hadoop.security.Credentials;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.TokenIdentifier;
/**
* This class provides user facing APIs for transferring secrets from
* the job client to the tasks.
* The secrets can be stored just before submission of jobs and read during
* the task execution.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class TokenCache {
private static final Log LOG = LogFactory.getLog(TokenCache.class);
/**
* auxiliary method to get user's secret keys..
* @param alias
* @return secret key from the storage
*/
public static byte[] getSecretKey(Credentials credentials, Text alias) {
if(credentials == null)
return null;
return credentials.getSecretKey(alias);
}
/**
* Convenience method to obtain delegation tokens from namenodes
* corresponding to the paths passed.
* @param credentials
* @param ps array of paths
* @param conf configuration
* @throws IOException
*/
public static void obtainTokensForNamenodes(Credentials credentials,
Path[] ps, Configuration conf) throws IOException {
if (!UserGroupInformation.isSecurityEnabled()) {
return;
}
obtainTokensForNamenodesInternal(credentials, ps, conf);
}
/**
* Remove jobtoken referrals which don't make sense in the context
* of the task execution.
*
* @param conf
*/
public static void cleanUpTokenReferral(Configuration conf) {
conf.unset(MRJobConfig.MAPREDUCE_JOB_CREDENTIALS_BINARY);
}
static void obtainTokensForNamenodesInternal(Credentials credentials,
Path[] ps, Configuration conf) throws IOException {
for(Path p: ps) {
FileSystem fs = FileSystem.get(p.toUri(), conf);
obtainTokensForNamenodesInternal(fs, credentials, conf);
}
}
/**
* get delegation token for a specific FS
* @param fs
* @param credentials
* @param p
* @param conf
* @throws IOException
*/
@SuppressWarnings("deprecation")
static void obtainTokensForNamenodesInternal(FileSystem fs,
Credentials credentials, Configuration conf) throws IOException {
String delegTokenRenewer = Master.getMasterPrincipal(conf);
if (delegTokenRenewer == null || delegTokenRenewer.length() == 0) {
throw new IOException(
"Can't get Master Kerberos principal for use as renewer");
}
boolean readFile = true;
String fsName = fs.getCanonicalServiceName();
if (TokenCache.getDelegationToken(credentials, fsName) == null) {
//TODO: Need to come up with a better place to put
//this block of code to do with reading the file
if (readFile) {
readFile = false;
String binaryTokenFilename =
conf.get(MRJobConfig.MAPREDUCE_JOB_CREDENTIALS_BINARY);
if (binaryTokenFilename != null) {
Credentials binary;
try {
binary = Credentials.readTokenStorageFile(
new Path("file:///" + binaryTokenFilename), conf);
} catch (IOException e) {
throw new RuntimeException(e);
}
credentials.addAll(binary);
}
if (TokenCache.getDelegationToken(credentials, fsName) != null) {
LOG.debug("DT for " + fsName + " is already present");
return;
}
}
List<Token<?>> tokens =
fs.getDelegationTokens(delegTokenRenewer, credentials);
if (tokens != null) {
for (Token<?> token : tokens) {
credentials.addToken(token.getService(), token);
LOG.info("Got dt for " + fs.getUri() + ";uri="+ fsName +
";t.service="+token.getService());
}
}
//Call getDelegationToken as well for now - for FS implementations
// which may not have implmented getDelegationTokens (hftp)
if (tokens == null || tokens.size() == 0) {
Token<?> token = fs.getDelegationToken(delegTokenRenewer);
if (token != null) {
credentials.addToken(token.getService(), token);
LOG.info("Got dt for " + fs.getUri() + ";uri=" + fsName
+ ";t.service=" + token.getService());
}
}
}
}
/**
* file name used on HDFS for generated job token
*/
@InterfaceAudience.Private
public static final String JOB_TOKEN_HDFS_FILE = "jobToken";
/**
* conf setting for job tokens cache file name
*/
@InterfaceAudience.Private
public static final String JOB_TOKENS_FILENAME = "mapreduce.job.jobTokenFile";
private static final Text JOB_TOKEN = new Text("ShuffleAndJobToken");
/**
*
* @param namenode
* @return delegation token
*/
@SuppressWarnings("unchecked")
@InterfaceAudience.Private
public static Token<DelegationTokenIdentifier> getDelegationToken(
Credentials credentials, String namenode) {
//No fs specific tokens issues by this fs. It may however issue tokens
// for other filesystems - which would be keyed by that filesystems name.
if (namenode == null)
return null;
return (Token<DelegationTokenIdentifier>) credentials.getToken(new Text(
namenode));
}
/**
* load job token from a file
* @param conf
* @throws IOException
*/
@InterfaceAudience.Private
public static Credentials loadTokens(String jobTokenFile, JobConf conf)
throws IOException {
Path localJobTokenFile = new Path ("file:///" + jobTokenFile);
Credentials ts = Credentials.readTokenStorageFile(localJobTokenFile, conf);
if(LOG.isDebugEnabled()) {
LOG.debug("Task: Loaded jobTokenFile from: "+
localJobTokenFile.toUri().getPath()
+"; num of sec keys = " + ts.numberOfSecretKeys() +
" Number of tokens " + ts.numberOfTokens());
}
return ts;
}
/**
* store job token
* @param t
*/
@InterfaceAudience.Private
public static void setJobToken(Token<? extends TokenIdentifier> t,
Credentials credentials) {
credentials.addToken(JOB_TOKEN, t);
}
/**
*
* @return job token
*/
@SuppressWarnings("unchecked")
@InterfaceAudience.Private
public static Token<JobTokenIdentifier> getJobToken(Credentials credentials) {
return (Token<JobTokenIdentifier>) credentials.getToken(JOB_TOKEN);
}
}