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UserGroupInformation.java
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UserGroupInformation.java
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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;
import static org.apache.hadoop.fs.CommonConfigurationKeys.HADOOP_USER_GROUP_METRICS_PERCENTILES_INTERVALS;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_KERBEROS_MIN_SECONDS_BEFORE_RELOGIN;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_KERBEROS_MIN_SECONDS_BEFORE_RELOGIN_DEFAULT;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_TOKEN_FILES;
import static org.apache.hadoop.security.UGIExceptionMessages.*;
import static org.apache.hadoop.util.PlatformName.IBM_JAVA;
import com.google.common.annotations.VisibleForTesting;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.UndeclaredThrowableException;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.Principal;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.EnumMap;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import javax.security.auth.DestroyFailedException;
import javax.security.auth.Subject;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.kerberos.KerberosPrincipal;
import javax.security.auth.kerberos.KerberosTicket;
import javax.security.auth.login.AppConfigurationEntry;
import javax.security.auth.login.AppConfigurationEntry.LoginModuleControlFlag;
import javax.security.auth.login.Configuration.Parameters;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
import javax.security.auth.spi.LoginModule;
import org.apache.hadoop.io.retry.RetryPolicies;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.retry.RetryPolicy;
import org.apache.hadoop.metrics2.annotation.Metric;
import org.apache.hadoop.metrics2.annotation.Metrics;
import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
import org.apache.hadoop.metrics2.lib.MetricsRegistry;
import org.apache.hadoop.metrics2.lib.MutableGaugeInt;
import org.apache.hadoop.metrics2.lib.MutableGaugeLong;
import org.apache.hadoop.metrics2.lib.MutableQuantiles;
import org.apache.hadoop.metrics2.lib.MutableRate;
import org.apache.hadoop.security.SaslRpcServer.AuthMethod;
import org.apache.hadoop.security.authentication.util.KerberosUtil;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.TokenIdentifier;
import org.apache.hadoop.util.Shell;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.util.Time;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* User and group information for Hadoop.
* This class wraps around a JAAS Subject and provides methods to determine the
* user's username and groups. It supports both the Windows, Unix and Kerberos
* login modules.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class UserGroupInformation {
@VisibleForTesting
static final Logger LOG = LoggerFactory.getLogger(
UserGroupInformation.class);
/**
* Percentage of the ticket window to use before we renew ticket.
*/
private static final float TICKET_RENEW_WINDOW = 0.80f;
private static boolean shouldRenewImmediatelyForTests = false;
static final String HADOOP_USER_NAME = "HADOOP_USER_NAME";
static final String HADOOP_PROXY_USER = "HADOOP_PROXY_USER";
/**
* For the purposes of unit tests, we want to test login
* from keytab and don't want to wait until the renew
* window (controlled by TICKET_RENEW_WINDOW).
* @param immediate true if we should login without waiting for ticket window
*/
@VisibleForTesting
public static void setShouldRenewImmediatelyForTests(boolean immediate) {
shouldRenewImmediatelyForTests = immediate;
}
/**
* UgiMetrics maintains UGI activity statistics
* and publishes them through the metrics interfaces.
*/
@Metrics(about="User and group related metrics", context="ugi")
static class UgiMetrics {
final MetricsRegistry registry = new MetricsRegistry("UgiMetrics");
@Metric("Rate of successful kerberos logins and latency (milliseconds)")
MutableRate loginSuccess;
@Metric("Rate of failed kerberos logins and latency (milliseconds)")
MutableRate loginFailure;
@Metric("GetGroups") MutableRate getGroups;
MutableQuantiles[] getGroupsQuantiles;
@Metric("Renewal failures since startup")
private MutableGaugeLong renewalFailuresTotal;
@Metric("Renewal failures since last successful login")
private MutableGaugeInt renewalFailures;
static UgiMetrics create() {
return DefaultMetricsSystem.instance().register(new UgiMetrics());
}
static void reattach() {
metrics = UgiMetrics.create();
}
void addGetGroups(long latency) {
getGroups.add(latency);
if (getGroupsQuantiles != null) {
for (MutableQuantiles q : getGroupsQuantiles) {
q.add(latency);
}
}
}
MutableGaugeInt getRenewalFailures() {
return renewalFailures;
}
}
/**
* A login module that looks at the Kerberos, Unix, or Windows principal and
* adds the corresponding UserName.
*/
@InterfaceAudience.Private
public static class HadoopLoginModule implements LoginModule {
private Subject subject;
@Override
public boolean abort() throws LoginException {
return true;
}
private <T extends Principal> T getCanonicalUser(Class<T> cls) {
for(T user: subject.getPrincipals(cls)) {
return user;
}
return null;
}
@Override
public boolean commit() throws LoginException {
if (LOG.isDebugEnabled()) {
LOG.debug("hadoop login commit");
}
// if we already have a user, we are done.
if (!subject.getPrincipals(User.class).isEmpty()) {
if (LOG.isDebugEnabled()) {
LOG.debug("using existing subject:"+subject.getPrincipals());
}
return true;
}
Principal user = getCanonicalUser(KerberosPrincipal.class);
if (user != null) {
if (LOG.isDebugEnabled()) {
LOG.debug("using kerberos user:"+user);
}
}
//If we don't have a kerberos user and security is disabled, check
//if user is specified in the environment or properties
if (!isSecurityEnabled() && (user == null)) {
String envUser = System.getenv(HADOOP_USER_NAME);
if (envUser == null) {
envUser = System.getProperty(HADOOP_USER_NAME);
}
user = envUser == null ? null : new User(envUser);
}
// use the OS user
if (user == null) {
user = getCanonicalUser(OS_PRINCIPAL_CLASS);
if (LOG.isDebugEnabled()) {
LOG.debug("using local user:"+user);
}
}
// if we found the user, add our principal
if (user != null) {
if (LOG.isDebugEnabled()) {
LOG.debug("Using user: \"" + user + "\" with name " + user.getName());
}
User userEntry = null;
try {
// LoginContext will be attached later unless it's an external
// subject.
AuthenticationMethod authMethod = (user instanceof KerberosPrincipal)
? AuthenticationMethod.KERBEROS : AuthenticationMethod.SIMPLE;
userEntry = new User(user.getName(), authMethod, null);
} catch (Exception e) {
throw (LoginException)(new LoginException(e.toString()).initCause(e));
}
if (LOG.isDebugEnabled()) {
LOG.debug("User entry: \"" + userEntry.toString() + "\"" );
}
subject.getPrincipals().add(userEntry);
return true;
}
LOG.error("Can't find user in " + subject);
throw new LoginException("Can't find user name");
}
@Override
public void initialize(Subject subject, CallbackHandler callbackHandler,
Map<String, ?> sharedState, Map<String, ?> options) {
this.subject = subject;
}
@Override
public boolean login() throws LoginException {
if (LOG.isDebugEnabled()) {
LOG.debug("hadoop login");
}
return true;
}
@Override
public boolean logout() throws LoginException {
if (LOG.isDebugEnabled()) {
LOG.debug("hadoop logout");
}
return true;
}
}
/**
* Reattach the class's metrics to a new metric system.
*/
public static void reattachMetrics() {
UgiMetrics.reattach();
}
/** Metrics to track UGI activity */
static UgiMetrics metrics = UgiMetrics.create();
/** The auth method to use */
private static AuthenticationMethod authenticationMethod;
/** Server-side groups fetching service */
private static Groups groups;
/** Min time (in seconds) before relogin for Kerberos */
private static long kerberosMinSecondsBeforeRelogin;
/** The configuration to use */
private static Configuration conf;
/**Environment variable pointing to the token cache file*/
public static final String HADOOP_TOKEN_FILE_LOCATION =
"HADOOP_TOKEN_FILE_LOCATION";
public static boolean isInitialized() {
return conf != null;
}
/**
* A method to initialize the fields that depend on a configuration.
* Must be called before useKerberos or groups is used.
*/
private static void ensureInitialized() {
if (!isInitialized()) {
synchronized(UserGroupInformation.class) {
if (!isInitialized()) { // someone might have beat us
initialize(new Configuration(), false);
}
}
}
}
/**
* Initialize UGI and related classes.
* @param conf the configuration to use
*/
private static synchronized void initialize(Configuration conf,
boolean overrideNameRules) {
authenticationMethod = SecurityUtil.getAuthenticationMethod(conf);
if (overrideNameRules || !HadoopKerberosName.hasRulesBeenSet()) {
try {
HadoopKerberosName.setConfiguration(conf);
} catch (IOException ioe) {
throw new RuntimeException(
"Problem with Kerberos auth_to_local name configuration", ioe);
}
}
try {
kerberosMinSecondsBeforeRelogin = 1000L * conf.getLong(
HADOOP_KERBEROS_MIN_SECONDS_BEFORE_RELOGIN,
HADOOP_KERBEROS_MIN_SECONDS_BEFORE_RELOGIN_DEFAULT);
}
catch(NumberFormatException nfe) {
throw new IllegalArgumentException("Invalid attribute value for " +
HADOOP_KERBEROS_MIN_SECONDS_BEFORE_RELOGIN + " of " +
conf.get(HADOOP_KERBEROS_MIN_SECONDS_BEFORE_RELOGIN));
}
// If we haven't set up testing groups, use the configuration to find it
if (!(groups instanceof TestingGroups)) {
groups = Groups.getUserToGroupsMappingService(conf);
}
UserGroupInformation.conf = conf;
if (metrics.getGroupsQuantiles == null) {
int[] intervals = conf.getInts(HADOOP_USER_GROUP_METRICS_PERCENTILES_INTERVALS);
if (intervals != null && intervals.length > 0) {
final int length = intervals.length;
MutableQuantiles[] getGroupsQuantiles = new MutableQuantiles[length];
for (int i = 0; i < length; i++) {
getGroupsQuantiles[i] = metrics.registry.newQuantiles(
"getGroups" + intervals[i] + "s",
"Get groups", "ops", "latency", intervals[i]);
}
metrics.getGroupsQuantiles = getGroupsQuantiles;
}
}
}
/**
* Set the static configuration for UGI.
* In particular, set the security authentication mechanism and the
* group look up service.
* @param conf the configuration to use
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static void setConfiguration(Configuration conf) {
initialize(conf, true);
}
@InterfaceAudience.Private
@VisibleForTesting
public static void reset() {
authenticationMethod = null;
conf = null;
groups = null;
kerberosMinSecondsBeforeRelogin = 0;
setLoginUser(null);
HadoopKerberosName.setRules(null);
}
/**
* Determine if UserGroupInformation is using Kerberos to determine
* user identities or is relying on simple authentication
*
* @return true if UGI is working in a secure environment
*/
public static boolean isSecurityEnabled() {
return !isAuthenticationMethodEnabled(AuthenticationMethod.SIMPLE);
}
@InterfaceAudience.Private
@InterfaceStability.Evolving
private static boolean isAuthenticationMethodEnabled(AuthenticationMethod method) {
ensureInitialized();
return (authenticationMethod == method);
}
/**
* Information about the logged in user.
*/
private static final AtomicReference<UserGroupInformation> loginUserRef =
new AtomicReference<>();
private final Subject subject;
// All non-static fields must be read-only caches that come from the subject.
private final User user;
private static String OS_LOGIN_MODULE_NAME;
private static Class<? extends Principal> OS_PRINCIPAL_CLASS;
private static final boolean windows =
System.getProperty("os.name").startsWith("Windows");
private static final boolean is64Bit =
System.getProperty("os.arch").contains("64") ||
System.getProperty("os.arch").contains("s390x");
private static final boolean aix = System.getProperty("os.name").equals("AIX");
/* Return the OS login module class name */
private static String getOSLoginModuleName() {
if (IBM_JAVA) {
if (windows) {
return is64Bit ? "com.ibm.security.auth.module.Win64LoginModule"
: "com.ibm.security.auth.module.NTLoginModule";
} else if (aix) {
return is64Bit ? "com.ibm.security.auth.module.AIX64LoginModule"
: "com.ibm.security.auth.module.AIXLoginModule";
} else {
return "com.ibm.security.auth.module.LinuxLoginModule";
}
} else {
return windows ? "com.sun.security.auth.module.NTLoginModule"
: "com.sun.security.auth.module.UnixLoginModule";
}
}
/* Return the OS principal class */
@SuppressWarnings("unchecked")
private static Class<? extends Principal> getOsPrincipalClass() {
ClassLoader cl = ClassLoader.getSystemClassLoader();
try {
String principalClass = null;
if (IBM_JAVA) {
if (is64Bit) {
principalClass = "com.ibm.security.auth.UsernamePrincipal";
} else {
if (windows) {
principalClass = "com.ibm.security.auth.NTUserPrincipal";
} else if (aix) {
principalClass = "com.ibm.security.auth.AIXPrincipal";
} else {
principalClass = "com.ibm.security.auth.LinuxPrincipal";
}
}
} else {
principalClass = windows ? "com.sun.security.auth.NTUserPrincipal"
: "com.sun.security.auth.UnixPrincipal";
}
return (Class<? extends Principal>) cl.loadClass(principalClass);
} catch (ClassNotFoundException e) {
LOG.error("Unable to find JAAS classes:" + e.getMessage());
}
return null;
}
static {
OS_LOGIN_MODULE_NAME = getOSLoginModuleName();
OS_PRINCIPAL_CLASS = getOsPrincipalClass();
}
private static class RealUser implements Principal {
private final UserGroupInformation realUser;
RealUser(UserGroupInformation realUser) {
this.realUser = realUser;
}
@Override
public String getName() {
return realUser.getUserName();
}
public UserGroupInformation getRealUser() {
return realUser;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
} else if (o == null || getClass() != o.getClass()) {
return false;
} else {
return realUser.equals(((RealUser) o).realUser);
}
}
@Override
public int hashCode() {
return realUser.hashCode();
}
@Override
public String toString() {
return realUser.toString();
}
}
private static HadoopLoginContext
newLoginContext(String appName, Subject subject,
HadoopConfiguration loginConf)
throws LoginException {
// Temporarily switch the thread's ContextClassLoader to match this
// class's classloader, so that we can properly load HadoopLoginModule
// from the JAAS libraries.
Thread t = Thread.currentThread();
ClassLoader oldCCL = t.getContextClassLoader();
t.setContextClassLoader(HadoopLoginModule.class.getClassLoader());
try {
return new HadoopLoginContext(appName, subject, loginConf);
} finally {
t.setContextClassLoader(oldCCL);
}
}
// return the LoginContext only if it's managed by the ugi. externally
// managed login contexts will be ignored.
private HadoopLoginContext getLogin() {
LoginContext login = user.getLogin();
return (login instanceof HadoopLoginContext)
? (HadoopLoginContext)login : null;
}
private void setLogin(LoginContext login) {
user.setLogin(login);
}
/**
* Create a UserGroupInformation for the given subject.
* This does not change the subject or acquire new credentials.
*
* The creator of subject is responsible for renewing credentials.
* @param subject the user's subject
*/
UserGroupInformation(Subject subject) {
this.subject = subject;
// do not access ANY private credentials since they are mutable
// during a relogin. no principal locking necessary since
// relogin/logout does not remove User principal.
this.user = subject.getPrincipals(User.class).iterator().next();
if (user == null || user.getName() == null) {
throw new IllegalStateException("Subject does not contain a valid User");
}
}
/**
* checks if logged in using kerberos
* @return true if the subject logged via keytab or has a Kerberos TGT
*/
public boolean hasKerberosCredentials() {
return user.getAuthenticationMethod() == AuthenticationMethod.KERBEROS;
}
/**
* Return the current user, including any doAs in the current stack.
* @return the current user
* @throws IOException if login fails
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static UserGroupInformation getCurrentUser() throws IOException {
AccessControlContext context = AccessController.getContext();
Subject subject = Subject.getSubject(context);
if (subject == null || subject.getPrincipals(User.class).isEmpty()) {
return getLoginUser();
} else {
return new UserGroupInformation(subject);
}
}
/**
* Find the most appropriate UserGroupInformation to use
*
* @param ticketCachePath The Kerberos ticket cache path, or NULL
* if none is specfied
* @param user The user name, or NULL if none is specified.
*
* @return The most appropriate UserGroupInformation
*/
public static UserGroupInformation getBestUGI(
String ticketCachePath, String user) throws IOException {
if (ticketCachePath != null) {
return getUGIFromTicketCache(ticketCachePath, user);
} else if (user == null) {
return getCurrentUser();
} else {
return createRemoteUser(user);
}
}
/**
* Create a UserGroupInformation from a Kerberos ticket cache.
*
* @param user The principal name to load from the ticket
* cache
* @param ticketCache the path to the ticket cache file
*
* @throws IOException if the kerberos login fails
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static UserGroupInformation getUGIFromTicketCache(
String ticketCache, String user) throws IOException {
if (!isAuthenticationMethodEnabled(AuthenticationMethod.KERBEROS)) {
return getBestUGI(null, user);
}
LoginParams params = new LoginParams();
params.put(LoginParam.PRINCIPAL, user);
params.put(LoginParam.CCACHE, ticketCache);
return doSubjectLogin(null, params);
}
/**
* Create a UserGroupInformation from a Subject with Kerberos principal.
*
* @param subject The KerberosPrincipal to use in UGI.
* The creator of subject is responsible for
* renewing credentials.
*
* @throws IOException
* @throws KerberosAuthException if the kerberos login fails
*/
public static UserGroupInformation getUGIFromSubject(Subject subject)
throws IOException {
if (subject == null) {
throw new KerberosAuthException(SUBJECT_MUST_NOT_BE_NULL);
}
if (subject.getPrincipals(KerberosPrincipal.class).isEmpty()) {
throw new KerberosAuthException(SUBJECT_MUST_CONTAIN_PRINCIPAL);
}
// null params indicate external subject login. no login context will
// be attached.
return doSubjectLogin(subject, null);
}
/**
* Get the currently logged in user. If no explicit login has occurred,
* the user will automatically be logged in with either kerberos credentials
* if available, or as the local OS user, based on security settings.
* @return the logged in user
* @throws IOException if login fails
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static UserGroupInformation getLoginUser() throws IOException {
UserGroupInformation loginUser = loginUserRef.get();
// a potential race condition exists only for the initial creation of
// the login user. there's no need to penalize all subsequent calls
// with sychronization overhead so optimistically create a login user
// and discard if we lose the race.
if (loginUser == null) {
UserGroupInformation newLoginUser = createLoginUser(null);
do {
// it's extremely unlikely that the login user will be non-null
// (lost CAS race), but be nulled before the subsequent get, but loop
// for correctness.
if (loginUserRef.compareAndSet(null, newLoginUser)) {
loginUser = newLoginUser;
// only spawn renewal if this login user is the winner.
loginUser.spawnAutoRenewalThreadForUserCreds(false);
} else {
loginUser = loginUserRef.get();
}
} while (loginUser == null);
}
return loginUser;
}
/**
* remove the login method that is followed by a space from the username
* e.g. "jack (auth:SIMPLE)" -> "jack"
*
* @param userName
* @return userName without login method
*/
public static String trimLoginMethod(String userName) {
int spaceIndex = userName.indexOf(' ');
if (spaceIndex >= 0) {
userName = userName.substring(0, spaceIndex);
}
return userName;
}
/**
* Log in a user using the given subject
* @param subject the subject to use when logging in a user, or null to
* create a new subject.
*
* If subject is not null, the creator of subject is responsible for renewing
* credentials.
*
* @throws IOException if login fails
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static void loginUserFromSubject(Subject subject) throws IOException {
setLoginUser(createLoginUser(subject));
}
private static
UserGroupInformation createLoginUser(Subject subject) throws IOException {
UserGroupInformation realUser = doSubjectLogin(subject, null);
UserGroupInformation loginUser = null;
try {
// If the HADOOP_PROXY_USER environment variable or property
// is specified, create a proxy user as the logged in user.
String proxyUser = System.getenv(HADOOP_PROXY_USER);
if (proxyUser == null) {
proxyUser = System.getProperty(HADOOP_PROXY_USER);
}
loginUser = proxyUser == null ? realUser : createProxyUser(proxyUser, realUser);
String tokenFileLocation = System.getProperty(HADOOP_TOKEN_FILES);
if (tokenFileLocation == null) {
tokenFileLocation = conf.get(HADOOP_TOKEN_FILES);
}
if (tokenFileLocation != null) {
for (String tokenFileName:
StringUtils.getTrimmedStrings(tokenFileLocation)) {
if (tokenFileName.length() > 0) {
File tokenFile = new File(tokenFileName);
if (tokenFile.exists() && tokenFile.isFile()) {
Credentials cred = Credentials.readTokenStorageFile(
tokenFile, conf);
loginUser.addCredentials(cred);
} else {
LOG.info("tokenFile("+tokenFileName+") does not exist");
}
}
}
}
String fileLocation = System.getenv(HADOOP_TOKEN_FILE_LOCATION);
if (fileLocation != null) {
// Load the token storage file and put all of the tokens into the
// user. Don't use the FileSystem API for reading since it has a lock
// cycle (HADOOP-9212).
File source = new File(fileLocation);
LOG.debug("Reading credentials from location set in {}: {}",
HADOOP_TOKEN_FILE_LOCATION,
source.getCanonicalPath());
if (!source.isFile()) {
throw new FileNotFoundException("Source file "
+ source.getCanonicalPath() + " from "
+ HADOOP_TOKEN_FILE_LOCATION
+ " not found");
}
Credentials cred = Credentials.readTokenStorageFile(
source, conf);
LOG.debug("Loaded {} tokens", cred.numberOfTokens());
loginUser.addCredentials(cred);
}
} catch (IOException ioe) {
LOG.debug("failure to load login credentials", ioe);
throw ioe;
}
if (LOG.isDebugEnabled()) {
LOG.debug("UGI loginUser:"+loginUser);
}
return loginUser;
}
@InterfaceAudience.Private
@InterfaceStability.Unstable
@VisibleForTesting
public static void setLoginUser(UserGroupInformation ugi) {
// if this is to become stable, should probably logout the currently
// logged in ugi if it's different
loginUserRef.set(ugi);
}
private String getKeytab() {
HadoopLoginContext login = getLogin();
return (login != null)
? login.getConfiguration().getParameters().get(LoginParam.KEYTAB)
: null;
}
/**
* Is the ugi managed by the UGI or an external subject?
* @return true if managed by UGI.
*/
private boolean isHadoopLogin() {
// checks if the private hadoop login context is managing the ugi.
return getLogin() != null;
}
/**
* Is this user logged in from a keytab file managed by the UGI?
* @return true if the credentials are from a keytab file.
*/
public boolean isFromKeytab() {
// can't simply check if keytab is present since a relogin failure will
// have removed the keytab from priv creds. instead, check login params.
return hasKerberosCredentials() && isHadoopLogin() && getKeytab() != null;
}
/**
* Is this user logged in from a ticket (but no keytab) managed by the UGI?
* @return true if the credentials are from a ticket cache.
*/
private boolean isFromTicket() {
return hasKerberosCredentials() && isHadoopLogin() && getKeytab() == null;
}
/**
* Get the Kerberos TGT
* @return the user's TGT or null if none was found
*/
private KerberosTicket getTGT() {
Set<KerberosTicket> tickets = subject
.getPrivateCredentials(KerberosTicket.class);
for (KerberosTicket ticket : tickets) {
if (SecurityUtil.isOriginalTGT(ticket)) {
return ticket;
}
}
return null;
}
private long getRefreshTime(KerberosTicket tgt) {
long start = tgt.getStartTime().getTime();
long end = tgt.getEndTime().getTime();
return start + (long) ((end - start) * TICKET_RENEW_WINDOW);
}
@InterfaceAudience.Private
@InterfaceStability.Unstable
public boolean shouldRelogin() {
return hasKerberosCredentials() && isHadoopLogin();
}
@InterfaceAudience.Private
@InterfaceStability.Unstable
@VisibleForTesting
/**
* Spawn a thread to do periodic renewals of kerberos credentials from
* a ticket cache. NEVER directly call this method.
* @param force - used by tests to forcibly spawn thread
*/
void spawnAutoRenewalThreadForUserCreds(boolean force) {
if (!force && (!shouldRelogin() || isFromKeytab())) {
return;
}
//spawn thread only if we have kerb credentials
KerberosTicket tgt = getTGT();
if (tgt == null) {
return;
}
String cmd = conf.get("hadoop.kerberos.kinit.command", "kinit");
long nextRefresh = getRefreshTime(tgt);
Thread t =
new Thread(new AutoRenewalForUserCredsRunnable(tgt, cmd, nextRefresh));
t.setDaemon(true);
t.setName("TGT Renewer for " + getUserName());
t.start();
}
@VisibleForTesting
class AutoRenewalForUserCredsRunnable implements Runnable {
private KerberosTicket tgt;
private RetryPolicy rp;
private String kinitCmd;
private long nextRefresh;
private boolean runRenewalLoop = true;
AutoRenewalForUserCredsRunnable(KerberosTicket tgt, String kinitCmd,
long nextRefresh){
this.tgt = tgt;
this.kinitCmd = kinitCmd;
this.nextRefresh = nextRefresh;
this.rp = null;
}
public void setRunRenewalLoop(boolean runRenewalLoop) {
this.runRenewalLoop = runRenewalLoop;
}
@Override
public void run() {
do {
try {
long now = Time.now();
if (LOG.isDebugEnabled()) {
LOG.debug("Current time is " + now);
LOG.debug("Next refresh is " + nextRefresh);
}
if (now < nextRefresh) {
Thread.sleep(nextRefresh - now);
}
String output = Shell.execCommand(kinitCmd, "-R");
if (LOG.isDebugEnabled()) {
LOG.debug("Renewed ticket. kinit output: {}", output);
}
reloginFromTicketCache();
tgt = getTGT();
if (tgt == null) {
LOG.warn("No TGT after renewal. Aborting renew thread for " +
getUserName());
return;
}
nextRefresh = Math.max(getRefreshTime(tgt),
now + kerberosMinSecondsBeforeRelogin);
metrics.renewalFailures.set(0);
rp = null;
} catch (InterruptedException ie) {
LOG.warn("Terminating renewal thread");
return;
} catch (IOException ie) {
metrics.renewalFailuresTotal.incr();
final long now = Time.now();
if (tgt.isDestroyed()) {
LOG.error("TGT is destroyed. Aborting renew thread for {}.",
getUserName());
return;
}
long tgtEndTime;
// As described in HADOOP-15593 we need to handle the case when
// tgt.getEndTime() throws NPE because of JDK issue JDK-8147772
// NPE is only possible if this issue is not fixed in the JDK
// currently used
try {
tgtEndTime = tgt.getEndTime().getTime();
} catch (NullPointerException npe) {
LOG.error("NPE thrown while getting KerberosTicket endTime. "
+ "Aborting renew thread for {}.", getUserName());
return;
}
LOG.warn("Exception encountered while running the renewal "
+ "command for {}. (TGT end time:{}, renewalFailures: {},"
+ "renewalFailuresTotal: {})", getUserName(), tgtEndTime,
metrics.renewalFailures.value(),
metrics.renewalFailuresTotal.value(), ie);
if (rp == null) {
// Use a dummy maxRetries to create the policy. The policy will
// only be used to get next retry time with exponential back-off.
// The final retry time will be later limited within the
// tgt endTime in getNextTgtRenewalTime.
rp = RetryPolicies.exponentialBackoffRetry(Long.SIZE - 2,
kerberosMinSecondsBeforeRelogin, TimeUnit.MILLISECONDS);
}
try {
nextRefresh = getNextTgtRenewalTime(tgtEndTime, now, rp);
} catch (Exception e) {
LOG.error("Exception when calculating next tgt renewal time", e);
return;
}
metrics.renewalFailures.incr();
// retry until close enough to tgt endTime.
if (now > nextRefresh) {
LOG.error("TGT is expired. Aborting renew thread for {}.",
getUserName());
return;
}
}
} while (runRenewalLoop);
}
}
/**
* Get time for next login retry. This will allow the thread to retry with
* exponential back-off, until tgt endtime.
* Last retry is {@link #kerberosMinSecondsBeforeRelogin} before endtime.
*
* @param tgtEndTime EndTime of the tgt.
* @param now Current time.
* @param rp The retry policy.
* @return Time for next login retry.
*/
@VisibleForTesting
static long getNextTgtRenewalTime(final long tgtEndTime, final long now,
final RetryPolicy rp) throws Exception {
final long lastRetryTime = tgtEndTime - kerberosMinSecondsBeforeRelogin;
final RetryPolicy.RetryAction ra = rp.shouldRetry(null,
metrics.renewalFailures.value(), 0, false);
return Math.min(lastRetryTime, now + ra.delayMillis);
}
/**
* Log a user in from a keytab file. Loads a user identity from a keytab
* file and logs them in. They become the currently logged-in user.
* @param user the principal name to load from the keytab
* @param path the path to the keytab file
* @throws IOException
* @throws KerberosAuthException if it's a kerberos login exception.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving