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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.security.token;
import java.io.File;
import java.io.IOException;
import java.io.PrintStream;
import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.ServiceConfigurationError;
import java.util.ServiceLoader;
import org.apache.commons.lang3.StringUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.Credentials;
import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* DtFileOperations is a collection of delegation token file operations.
*/
public final class DtFileOperations {
private static final Logger LOG =
LoggerFactory.getLogger(DtFileOperations.class);
/** No public constructor as per checkstyle. */
private DtFileOperations() { }
/**
* Use FORMAT_* as arguments to format parameters.
* FORMAT_PB is for protobuf output.
*/
public static final String FORMAT_PB = "protobuf";
/**
* Use FORMAT_* as arguments to format parameters.
* FORMAT_JAVA is a legacy option for java serialization output.
*/
public static final String FORMAT_JAVA = "java";
private static final String NA_STRING = "-NA-";
private static final String PREFIX_HTTP = "http://";
private static final String PREFIX_HTTPS = "https://";
/** Let the DtFetcher code add the appropriate prefix if HTTP/S is used. */
private static String stripPrefix(String u) {
return u.replaceFirst(PREFIX_HTTP, "").replaceFirst(PREFIX_HTTPS, "");
}
/** Match token service field to alias text. True if alias is null. */
private static boolean matchAlias(Token token, Text alias) {
return alias == null || token.getService().equals(alias);
}
/** Match fetcher's service name to the service text and/or url prefix. */
private static boolean matchService(
DtFetcher fetcher, Text service, String url) {
Text sName = fetcher.getServiceName();
return (service == null && url.startsWith(sName.toString() + "://")) ||
(service != null && service.equals(sName));
}
/** Format a long integer type into a date string. */
private static String formatDate(long date) {
DateFormat df = DateFormat.getDateTimeInstance(
DateFormat.SHORT, DateFormat.SHORT);
return df.format(new Date(date));
}
/** Add the service prefix for a local filesystem. */
private static Path fileToPath(File f) {
return new Path(f.toURI().toString());
}
/** Write out a Credentials object as a local file.
* @param f a local File object.
* @param format a string equal to FORMAT_PB or FORMAT_JAVA.
* @param creds the Credentials object to be written out.
* @param conf a Configuration object passed along.
* @throws IOException
*/
public static void doFormattedWrite(
File f, String format, Credentials creds, Configuration conf)
throws IOException {
// default to oldest supported format for compatibility
Credentials.SerializedFormat credsFormat =
Credentials.SerializedFormat.WRITABLE;
if (format.equals(FORMAT_PB)) {
credsFormat = Credentials.SerializedFormat.PROTOBUF;
}
creds.writeTokenStorageFile(fileToPath(f), conf, credsFormat);
}
/** Print out a Credentials file from the local filesystem.
* @param tokenFile a local File object.
* @param alias print only tokens matching alias (null matches all).
* @param conf Configuration object passed along.
* @param out print to this stream.
* @throws IOException
*/
public static void printTokenFile(
File tokenFile, Text alias, Configuration conf, PrintStream out)
throws IOException {
out.println("File: " + tokenFile.getPath());
Credentials creds = Credentials.readTokenStorageFile(tokenFile, conf);
printCredentials(creds, alias, out);
}
/** Print out a Credentials object.
* @param creds the Credentials object to be printed out.
* @param alias print only tokens matching alias (null matches all).
* @param out print to this stream.
* @throws IOException failure to unmarshall a token identifier.
*/
public static void printCredentials(
Credentials creds, Text alias, PrintStream out)
throws IOException {
boolean tokenHeader = true;
String fmt = "%-24s %-20s %-15s %-12s %s%n";
for (Token token : creds.getAllTokens()) {
if (matchAlias(token, alias)) {
if (tokenHeader) {
out.printf(fmt, "Token kind", "Service", "Renewer", "Exp date",
"URL enc token");
out.println(StringUtils.repeat("-", 80));
tokenHeader = false;
}
AbstractDelegationTokenIdentifier id;
try {
id = (AbstractDelegationTokenIdentifier) token.decodeIdentifier();
} catch (IllegalStateException e) {
LOG.debug("Failed to decode token identifier", e);
id = null;
}
out.printf(fmt, token.getKind(), token.getService(),
(id != null) ? id.getRenewer() : NA_STRING,
(id != null) ? formatDate(id.getMaxDate()) : NA_STRING,
token.encodeToUrlString());
}
}
}
/** Fetch a token from a service and save to file in the local filesystem.
* @param tokenFile a local File object to hold the output.
* @param fileFormat a string equal to FORMAT_PB or FORMAT_JAVA, for output
* @param alias overwrite service field of fetched token with this text.
* @param service use a DtFetcher implementation matching this service text.
* @param url pass this URL to fetcher after stripping any http/s prefix.
* @param renewer pass this renewer to the fetcher.
* @param conf Configuration object passed along.
* @throws IOException
*/
public static void getTokenFile(File tokenFile, String fileFormat,
Text alias, Text service, String url, String renewer, Configuration conf)
throws Exception {
Token token = null;
Credentials creds = tokenFile.exists() ?
Credentials.readTokenStorageFile(tokenFile, conf) : new Credentials();
ServiceLoader loader = ServiceLoader.load(DtFetcher.class);
Iterator iterator = loader.iterator();
while (iterator.hasNext()) {
DtFetcher fetcher;
try {
fetcher = iterator.next();
} catch (ServiceConfigurationError e) {
// failure to load a token implementation
// log at debug and continue.
LOG.debug("Failed to load token fetcher implementation", e);
continue;
}
if (matchService(fetcher, service, url)) {
if (!fetcher.isTokenRequired()) {
String message = "DtFetcher for service '" + service +
"' does not require a token. Check your configuration. " +
"Note: security may be disabled or there may be two DtFetcher " +
"providers for the same service designation.";
LOG.error(message);
throw new IllegalArgumentException(message);
}
token = fetcher.addDelegationTokens(conf, creds, renewer,
stripPrefix(url));
}
}
if (alias != null) {
if (token == null) {
String message = "DtFetcher for service '" + service + "'" +
" does not allow aliasing. Cannot apply alias '" + alias + "'." +
" Drop alias flag to get token for this service.";
LOG.error(message);
throw new IOException(message);
}
Token aliasedToken = token.copyToken();
aliasedToken.setService(alias);
creds.addToken(alias, aliasedToken);
LOG.info("Add token with service " + alias);
}
doFormattedWrite(tokenFile, fileFormat, creds, conf);
}
/** Alias a token from a file and save back to file in the local filesystem.
* @param tokenFile a local File object to hold the input and output.
* @param fileFormat a string equal to FORMAT_PB or FORMAT_JAVA, for output
* @param alias overwrite service field of fetched token with this text.
* @param service only apply alias to tokens matching this service text.
* @param conf Configuration object passed along.
* @throws IOException
*/
public static void aliasTokenFile(File tokenFile, String fileFormat,
Text alias, Text service, Configuration conf) throws Exception {
Credentials newCreds = new Credentials();
Credentials creds = Credentials.readTokenStorageFile(tokenFile, conf);
for (Token token : creds.getAllTokens()) {
newCreds.addToken(token.getService(), token);
if (token.getService().equals(service)) {
Token aliasedToken = token.copyToken();
aliasedToken.setService(alias);
newCreds.addToken(alias, aliasedToken);
}
}
doFormattedWrite(tokenFile, fileFormat, newCreds, conf);
}
/** Append tokens from list of files in local filesystem, saving to last file.
* @param tokenFiles list of local File objects. Last file holds the output.
* @param fileFormat a string equal to FORMAT_PB or FORMAT_JAVA, for output
* @param conf Configuration object passed along.
* @throws IOException
*/
public static void appendTokenFiles(
ArrayList tokenFiles, String fileFormat, Configuration conf)
throws IOException {
Credentials newCreds = new Credentials();
File lastTokenFile = null;
for (File tokenFile : tokenFiles) {
lastTokenFile = tokenFile;
Credentials creds = Credentials.readTokenStorageFile(tokenFile, conf);
for (Token token : creds.getAllTokens()) {
newCreds.addToken(token.getService(), token);
}
}
doFormattedWrite(lastTokenFile, fileFormat, newCreds, conf);
}
/** Remove a token from a file in the local filesystem, matching alias.
* @param cancel cancel token as well as remove from file.
* @param tokenFile a local File object.
* @param fileFormat a string equal to FORMAT_PB or FORMAT_JAVA, for output
* @param alias remove only tokens matching alias; null matches all.
* @param conf Configuration object passed along.
* @throws IOException
* @throws InterruptedException
*/
public static void removeTokenFromFile(boolean cancel,
File tokenFile, String fileFormat, Text alias, Configuration conf)
throws IOException, InterruptedException {
Credentials newCreds = new Credentials();
Credentials creds = Credentials.readTokenStorageFile(tokenFile, conf);
for (Token token : creds.getAllTokens()) {
if (matchAlias(token, alias)) {
if (token.isManaged() && cancel) {
token.cancel(conf);
LOG.info("Canceled " + token.getKind() + ":" + token.getService());
}
} else {
newCreds.addToken(token.getService(), token);
}
}
doFormattedWrite(tokenFile, fileFormat, newCreds, conf);
}
/** Renew a token from a file in the local filesystem, matching alias.
* @param tokenFile a local File object.
* @param fileFormat a string equal to FORMAT_PB or FORMAT_JAVA, for output
* @param alias renew only tokens matching alias; null matches all.
* @param conf Configuration object passed along.
* @throws IOException
* @throws InterruptedException
*/
public static void renewTokenFile(
File tokenFile, String fileFormat, Text alias, Configuration conf)
throws IOException, InterruptedException {
Credentials creds = Credentials.readTokenStorageFile(tokenFile, conf);
for (Token token : creds.getAllTokens()) {
if (token.isManaged() && matchAlias(token, alias)) {
long result = token.renew(conf);
LOG.info("Renewed" + token.getKind() + ":" + token.getService() +
" until " + formatDate(result));
}
}
doFormattedWrite(tokenFile, fileFormat, creds, conf);
}
/** Import a token from a base64 encoding into the local filesystem.
* @param tokenFile A local File object.
* @param fileFormat A string equal to FORMAT_PB or FORMAT_JAVA, for output.
* @param alias overwrite Service field of fetched token with this text.
* @param base64 urlString Encoding of the token to import.
* @param conf Configuration object passed along.
* @throws IOException Error to import the token into the file.
*/
public static void importTokenFile(File tokenFile, String fileFormat,
Text alias, String base64, Configuration conf)
throws IOException {
Credentials creds = tokenFile.exists() ?
Credentials.readTokenStorageFile(tokenFile, conf) : new Credentials();
Token token = new Token<>();
token.decodeFromUrlString(base64);
if (alias != null) {
token.setService(alias);
}
creds.addToken(token.getService(), token);
LOG.info("Add token with service {}", token.getService());
doFormattedWrite(tokenFile, fileFormat, creds, conf);
}
}
