/**
* 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_KERBEROS_MIN_SECONDS_BEFORE_RELOGIN;
import static org.apache.hadoop.fs.CommonConfigurationKeys.HADOOP_KERBEROS_MIN_SECONDS_BEFORE_RELOGIN_DEFAULT;
import static org.apache.hadoop.fs.CommonConfigurationKeys.HADOOP_USER_GROUP_METRICS_PERCENTILES_INTERVALS;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_TOKEN_FILES;
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.HashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
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.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.LimitedPrivate({"HDFS", "MapReduce", "HBase", "Hive", "Oozie"})
@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 = null;
// if we are using kerberos, try it out
if (isAuthenticationMethodEnabled(AuthenticationMethod.KERBEROS)) {
user = getCanonicalUser(KerberosPrincipal.class);
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 {
userEntry = new User(user.getName());
} 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";
/**
* 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 (conf == null) {
synchronized(UserGroupInformation.class) {
if (conf == null) { // 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;
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 UserGroupInformation loginUser = null;
private static String keytabPrincipal = null;
private static String keytabFile = null;
private final Subject subject;
// All non-static fields must be read-only caches that come from the subject.
private final User user;
private final boolean isKeytab;
private final boolean isKrbTkt;
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");
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();
}
}
/**
* A JAAS configuration that defines the login modules that we want
* to use for login.
*/
private static class HadoopConfiguration
extends javax.security.auth.login.Configuration {
private static final String SIMPLE_CONFIG_NAME = "hadoop-simple";
private static final String USER_KERBEROS_CONFIG_NAME =
"hadoop-user-kerberos";
private static final String KEYTAB_KERBEROS_CONFIG_NAME =
"hadoop-keytab-kerberos";
private static final Map<String, String> BASIC_JAAS_OPTIONS =
new HashMap<String,String>();
static {
String jaasEnvVar = System.getenv("HADOOP_JAAS_DEBUG");
if (jaasEnvVar != null && "true".equalsIgnoreCase(jaasEnvVar)) {
BASIC_JAAS_OPTIONS.put("debug", "true");
}
}
private static final AppConfigurationEntry OS_SPECIFIC_LOGIN =
new AppConfigurationEntry(OS_LOGIN_MODULE_NAME,
LoginModuleControlFlag.REQUIRED,
BASIC_JAAS_OPTIONS);
private static final AppConfigurationEntry HADOOP_LOGIN =
new AppConfigurationEntry(HadoopLoginModule.class.getName(),
LoginModuleControlFlag.REQUIRED,
BASIC_JAAS_OPTIONS);
private static final Map<String,String> USER_KERBEROS_OPTIONS =
new HashMap<String,String>();
static {
if (IBM_JAVA) {
USER_KERBEROS_OPTIONS.put("useDefaultCcache", "true");
} else {
USER_KERBEROS_OPTIONS.put("doNotPrompt", "true");
USER_KERBEROS_OPTIONS.put("useTicketCache", "true");
}
String ticketCache = System.getenv("KRB5CCNAME");
if (ticketCache != null) {
if (IBM_JAVA) {
// The first value searched when "useDefaultCcache" is used.
System.setProperty("KRB5CCNAME", ticketCache);
} else {
USER_KERBEROS_OPTIONS.put("ticketCache", ticketCache);
}
}
USER_KERBEROS_OPTIONS.put("renewTGT", "true");
USER_KERBEROS_OPTIONS.putAll(BASIC_JAAS_OPTIONS);
}
private static final AppConfigurationEntry USER_KERBEROS_LOGIN =
new AppConfigurationEntry(KerberosUtil.getKrb5LoginModuleName(),
LoginModuleControlFlag.OPTIONAL,
USER_KERBEROS_OPTIONS);
private static final Map<String,String> KEYTAB_KERBEROS_OPTIONS =
new HashMap<String,String>();
static {
if (IBM_JAVA) {
KEYTAB_KERBEROS_OPTIONS.put("credsType", "both");
} else {
KEYTAB_KERBEROS_OPTIONS.put("doNotPrompt", "true");
KEYTAB_KERBEROS_OPTIONS.put("useKeyTab", "true");
KEYTAB_KERBEROS_OPTIONS.put("storeKey", "true");
}
KEYTAB_KERBEROS_OPTIONS.put("refreshKrb5Config", "true");
KEYTAB_KERBEROS_OPTIONS.putAll(BASIC_JAAS_OPTIONS);
}
private static final AppConfigurationEntry KEYTAB_KERBEROS_LOGIN =
new AppConfigurationEntry(KerberosUtil.getKrb5LoginModuleName(),
LoginModuleControlFlag.REQUIRED,
KEYTAB_KERBEROS_OPTIONS);
private static final AppConfigurationEntry[] SIMPLE_CONF =
new AppConfigurationEntry[]{OS_SPECIFIC_LOGIN, HADOOP_LOGIN};
private static final AppConfigurationEntry[] USER_KERBEROS_CONF =
new AppConfigurationEntry[]{OS_SPECIFIC_LOGIN, USER_KERBEROS_LOGIN,
HADOOP_LOGIN};
private static final AppConfigurationEntry[] KEYTAB_KERBEROS_CONF =
new AppConfigurationEntry[]{KEYTAB_KERBEROS_LOGIN, HADOOP_LOGIN};
@Override
public AppConfigurationEntry[] getAppConfigurationEntry(String appName) {
if (SIMPLE_CONFIG_NAME.equals(appName)) {
return SIMPLE_CONF;
} else if (USER_KERBEROS_CONFIG_NAME.equals(appName)) {
return USER_KERBEROS_CONF;
} else if (KEYTAB_KERBEROS_CONFIG_NAME.equals(appName)) {
if (IBM_JAVA) {
KEYTAB_KERBEROS_OPTIONS.put("useKeytab",
prependFileAuthority(keytabFile));
} else {
KEYTAB_KERBEROS_OPTIONS.put("keyTab", keytabFile);
}
KEYTAB_KERBEROS_OPTIONS.put("principal", keytabPrincipal);
return KEYTAB_KERBEROS_CONF;
}
return null;
}
}
private static String prependFileAuthority(String keytabPath) {
return keytabPath.startsWith("file://") ? keytabPath
: "file://" + keytabPath;
}
/**
* Represents a javax.security configuration that is created at runtime.
*/
private static class DynamicConfiguration
extends javax.security.auth.login.Configuration {
private AppConfigurationEntry[] ace;
DynamicConfiguration(AppConfigurationEntry[] ace) {
this.ace = ace;
}
@Override
public AppConfigurationEntry[] getAppConfigurationEntry(String appName) {
return ace;
}
}
private static LoginContext
newLoginContext(String appName, Subject subject,
javax.security.auth.login.Configuration 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 LoginContext(appName, subject, null, loginConf);
} finally {
t.setContextClassLoader(oldCCL);
}
}
private LoginContext getLogin() {
return user.getLogin();
}
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.
* @param subject the user's subject
*/
UserGroupInformation(Subject subject) {
this(subject, false);
}
/**
* Create a UGI from the given subject.
* @param subject the subject
* @param externalKeyTab if the subject's keytab is managed by the user.
* Setting this to true will prevent UGI from attempting
* to login the keytab, or to renew it.
*/
private UserGroupInformation(Subject subject, final boolean externalKeyTab) {
this.subject = subject;
this.user = subject.getPrincipals(User.class).iterator().next();
if (externalKeyTab) {
this.isKeytab = false;
} else {
this.isKeytab = KerberosUtil.hasKerberosKeyTab(subject);
}
this.isKrbTkt = KerberosUtil.hasKerberosTicket(subject);
}
/**
* checks if logged in using kerberos
* @return true if the subject logged via keytab or has a Kerberos TGT
*/
public boolean hasKerberosCredentials() {
return isKeytab || isKrbTkt;
}
/**
* 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 synchronized
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 ticketCachePath 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);
}
try {
Map<String,String> krbOptions = new HashMap<String,String>();
if (IBM_JAVA) {
krbOptions.put("useDefaultCcache", "true");
// The first value searched when "useDefaultCcache" is used.
System.setProperty("KRB5CCNAME", ticketCache);
} else {
krbOptions.put("doNotPrompt", "true");
krbOptions.put("useTicketCache", "true");
krbOptions.put("useKeyTab", "false");
krbOptions.put("ticketCache", ticketCache);
}
krbOptions.put("renewTGT", "false");
krbOptions.putAll(HadoopConfiguration.BASIC_JAAS_OPTIONS);
AppConfigurationEntry ace = new AppConfigurationEntry(
KerberosUtil.getKrb5LoginModuleName(),
LoginModuleControlFlag.REQUIRED,
krbOptions);
DynamicConfiguration dynConf =
new DynamicConfiguration(new AppConfigurationEntry[]{ ace });
LoginContext login = newLoginContext(
HadoopConfiguration.USER_KERBEROS_CONFIG_NAME, null, dynConf);
login.login();
Subject loginSubject = login.getSubject();
Set<Principal> loginPrincipals = loginSubject.getPrincipals();
if (loginPrincipals.isEmpty()) {
throw new RuntimeException("No login principals found!");
}
if (loginPrincipals.size() != 1) {
LOG.warn("found more than one principal in the ticket cache file " +
ticketCache);
}
User ugiUser = new User(loginPrincipals.iterator().next().getName(),
AuthenticationMethod.KERBEROS, login);
loginSubject.getPrincipals().add(ugiUser);
UserGroupInformation ugi = new UserGroupInformation(loginSubject);
ugi.setLogin(login);
ugi.setAuthenticationMethod(AuthenticationMethod.KERBEROS);
return ugi;
} catch (LoginException le) {
throw new IOException("failure to login using ticket cache file " +
ticketCache, le);
}
}
/**
* Create a UserGroupInformation from a Subject with Kerberos principal.
*
* @param user The KerberosPrincipal to use in UGI
*
* @throws IOException if the kerberos login fails
*/
public static UserGroupInformation getUGIFromSubject(Subject subject)
throws IOException {
if (subject == null) {
throw new IOException("Subject must not be null");
}
if (subject.getPrincipals(KerberosPrincipal.class).isEmpty()) {
throw new IOException("Provided Subject must contain a KerberosPrincipal");
}
KerberosPrincipal principal =
subject.getPrincipals(KerberosPrincipal.class).iterator().next();
User ugiUser = new User(principal.getName(),
AuthenticationMethod.KERBEROS, null);
subject.getPrincipals().add(ugiUser);
UserGroupInformation ugi = new UserGroupInformation(subject);
ugi.setLogin(null);
ugi.setAuthenticationMethod(AuthenticationMethod.KERBEROS);
return ugi;
}
/**
* Get the currently logged in user.
* @return the logged in user
* @throws IOException if login fails
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public synchronized
static UserGroupInformation getLoginUser() throws IOException {
if (loginUser == null) {
loginUserFromSubject(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
* @parma subject the subject to use when logging in a user, or null to
* create a new subject.
* @throws IOException if login fails
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public synchronized
static void loginUserFromSubject(Subject subject) throws IOException {
ensureInitialized();
try {
if (subject == null) {
subject = new Subject();
}
LoginContext login =
newLoginContext(authenticationMethod.getLoginAppName(),
subject, new HadoopConfiguration());
login.login();
LOG.debug("Assuming keytab is managed externally since logged in from"
+ " subject.");
UserGroupInformation realUser = new UserGroupInformation(subject, true);
realUser.setLogin(login);
realUser.setAuthenticationMethod(authenticationMethod);
// 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);
}
loginUser.spawnAutoRenewalThreadForUserCreds();
} catch (LoginException le) {
LOG.debug("failure to login", le);
throw new IOException("failure to login: " + le, le);
}
if (LOG.isDebugEnabled()) {
LOG.debug("UGI loginUser:"+loginUser);
}
}
@InterfaceAudience.Private
@InterfaceStability.Unstable
@VisibleForTesting
public synchronized static void setLoginUser(UserGroupInformation ugi) {
// if this is to become stable, should probably logout the currently
// logged in ugi if it's different
loginUser = ugi;
}
/**
* Is this user logged in from a keytab file?
* @return true if the credentials are from a keytab file.
*/
public boolean isFromKeytab() {
return isKeytab;
}
/**
* Get the Kerberos TGT
* @return the user's TGT or null if none was found
*/
private synchronized KerberosTicket getTGT() {
Set<KerberosTicket> tickets = subject
.getPrivateCredentials(KerberosTicket.class);
for (KerberosTicket ticket : tickets) {
if (SecurityUtil.isOriginalTGT(ticket)) {
if (LOG.isDebugEnabled()) {
LOG.debug("Found tgt " + 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);
}
/**Spawn a thread to do periodic renewals of kerberos credentials*/
private void spawnAutoRenewalThreadForUserCreds() {
if (isSecurityEnabled()) {
//spawn thread only if we have kerb credentials
if (user.getAuthenticationMethod() == AuthenticationMethod.KERBEROS &&
!isKeytab) {
Thread t = new Thread(new Runnable() {
@Override
public void run() {
String cmd = conf.get("hadoop.kerberos.kinit.command",
"kinit");
KerberosTicket tgt = getTGT();
if (tgt == null) {
return;
}
long nextRefresh = getRefreshTime(tgt);
RetryPolicy rp = null;
while (true) {
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);
}
Shell.execCommand(cmd, "-R");
if(LOG.isDebugEnabled()) {
LOG.debug("renewed ticket");
}
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 tgtEndTime = tgt.getEndTime().getTime();
LOG.warn("Exception encountered while running the renewal "
+ "command for {}. (TGT end time:{}, renewalFailures: {},"
+ "renewalFailuresTotal: {})", getUserName(), tgtEndTime,
metrics.renewalFailures, metrics.renewalFailuresTotal, ie);
final long now = Time.now();
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;
}
}
}
}
});
t.setDaemon(true);
t.setName("TGT Renewer for " + getUserName());
t.start();
}
}
}
/**
* 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 if the keytab file can't be read
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public synchronized
static void loginUserFromKeytab(String user,
String path
) throws IOException {
if (!isSecurityEnabled())
return;
keytabFile = path;
keytabPrincipal = user;
Subject subject = new Subject();
LoginContext login;
long start = 0;
try {
login = newLoginContext(HadoopConfiguration.KEYTAB_KERBEROS_CONFIG_NAME,
subject, new HadoopConfiguration());
start = Time.now();
login.login();
metrics.loginSuccess.add(Time.now() - start);
loginUser = new UserGroupInformation(subject);
loginUser.setLogin(login);
loginUser.setAuthenticationMethod(AuthenticationMethod.KERBEROS);
} catch (LoginException le) {
if (start > 0) {
metrics.loginFailure.add(Time.now() - start);
}
throw new IOException("Login failure for " + user + " from keytab " +
path+ ": " + le, le);
}
LOG.info("Login successful for user " + keytabPrincipal
+ " using keytab file " + keytabFile);
}
/**
* Log the current user out who previously logged in using keytab.
* This method assumes that the user logged in by calling
* {@link #loginUserFromKeytab(String, String)}.
*
* @throws IOException if a failure occurred in logout, or if the user did
* not log in by invoking loginUserFromKeyTab() before.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public void logoutUserFromKeytab() throws IOException {
if (!isSecurityEnabled() ||
user.getAuthenticationMethod() != AuthenticationMethod.KERBEROS) {
return;
}
LoginContext login = getLogin();
if (login == null || keytabFile == null) {
throw new IOException("loginUserFromKeytab must be done first");
}
try {
if (LOG.isDebugEnabled()) {
LOG.debug("Initiating logout for " + getUserName());
}
synchronized (UserGroupInformation.class) {
login.logout();
}
} catch (LoginException le) {
throw new IOException("Logout failure for " + user + " from keytab " +
keytabFile + ": " + le,
le);
}
LOG.info("Logout successful for user " + keytabPrincipal
+ " using keytab file " + keytabFile);
}
/**
* Re-login a user from keytab if TGT is expired or is close to expiry.
*
* @throws IOException
*/
public synchronized void checkTGTAndReloginFromKeytab() throws IOException {
if (!isSecurityEnabled()
|| user.getAuthenticationMethod() != AuthenticationMethod.KERBEROS
|| !isKeytab)
return;
KerberosTicket tgt = getTGT();
if (tgt != null && !shouldRenewImmediatelyForTests &&
Time.now() < getRefreshTime(tgt)) {
return;
}
reloginFromKeytab();
}
// if the first kerberos ticket is not TGT, then remove and destroy it since
// the kerberos library of jdk always use the first kerberos ticket as TGT.
// See HADOOP-13433 for more details.
private void fixKerberosTicketOrder() {
Set<Object> creds = getSubject().getPrivateCredentials();
synchronized (creds) {
for (Iterator<Object> iter = creds.iterator(); iter.hasNext();) {
Object cred = iter.next();
if (cred instanceof KerberosTicket) {
KerberosTicket ticket = (KerberosTicket) cred;
if (!ticket.getServer().getName().startsWith("krbtgt")) {
LOG.warn("The first kerberos ticket is not TGT(the server" +
" principal is " + ticket.getServer() + "), remove" +
" and destroy it.");
iter.remove();
try {
ticket.destroy();
} catch (DestroyFailedException e) {
LOG.warn("destroy ticket failed", e);
}
} else {
return;
}
}
}
}
LOG.warn("Warning, no kerberos ticket found while attempting to renew" +
" ticket");
}
/**
* Re-Login 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. This
* method assumes that {@link #loginUserFromKeytab(String, String)} had
* happened already.
* The Subject field of this UserGroupInformation object is updated to have
* the new credentials.
* @throws IOException on a failure
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public synchronized void reloginFromKeytab() throws IOException {
if (!isSecurityEnabled()
|| user.getAuthenticationMethod() != AuthenticationMethod.KERBEROS
|| !isKeytab) {
return;
}
long now = Time.now();
if (!shouldRenewImmediatelyForTests && !hasSufficientTimeElapsed(now)) {
return;
}
KerberosTicket tgt = getTGT();
//Return if TGT is valid and is not going to expire soon.
if (tgt != null && !shouldRenewImmediatelyForTests &&
now < getRefreshTime(tgt)) {
return;
}
LoginContext login = getLogin();
if (login == null || keytabFile == null) {
throw new IOException("loginUserFromKeyTab must be done first");
}
long start = 0;
// register most recent relogin attempt
user.setLastLogin(now);
try {
if (LOG.isDebugEnabled()) {
LOG.debug("Initiating logout for " + getUserName());
}
synchronized (UserGroupInformation.class) {
// clear up the kerberos state. But the tokens are not cleared! As per
// the Java kerberos login module code, only the kerberos credentials
// are cleared
login.logout();
// login and also update the subject field of this instance to
// have the new credentials (pass it to the LoginContext constructor)
login = newLoginContext(
HadoopConfiguration.KEYTAB_KERBEROS_CONFIG_NAME, getSubject(),
new HadoopConfiguration());
if (LOG.isDebugEnabled()) {
LOG.debug("Initiating re-login for " + keytabPrincipal);
}
start = Time.now();
login.login();
fixKerberosTicketOrder();
metrics.loginSuccess.add(Time.now() - start);
setLogin(login);
}
} catch (LoginException le) {
if (start > 0) {
metrics.loginFailure.add(Time.now() - start);
}
throw new IOException("Login failure for " + keytabPrincipal +
" from keytab " + keytabFile + ": " + le, le);
}
}
/**
* Re-Login a user in from the ticket cache. This
* method assumes that login had happened already.
* The Subject field of this UserGroupInformation object is updated to have
* the new credentials.
* @throws IOException on a failure
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public synchronized void reloginFromTicketCache() throws IOException {
if (!isSecurityEnabled()
|| user.getAuthenticationMethod() != AuthenticationMethod.KERBEROS
|| !isKrbTkt) {
return;
}
LoginContext login = getLogin();
if (login == null) {
throw new IOException("login must be done first");
}
long now = Time.now();
if (!hasSufficientTimeElapsed(now)) {
return;
}
// register most recent relogin attempt
user.setLastLogin(now);
try {
if (LOG.isDebugEnabled()) {
LOG.debug("Initiating logout for " + getUserName());
}
//clear up the kerberos state. But the tokens are not cleared! As per
//the Java kerberos login module code, only the kerberos credentials
//are cleared
login.logout();
//login and also update the subject field of this instance to
//have the new credentials (pass it to the LoginContext constructor)
login =
newLoginContext(HadoopConfiguration.USER_KERBEROS_CONFIG_NAME,
getSubject(), new HadoopConfiguration());
if (LOG.isDebugEnabled()) {
LOG.debug("Initiating re-login for " + getUserName());
}
login.login();
fixKerberosTicketOrder();
setLogin(login);
} catch (LoginException le) {
throw new IOException("Login failure for " + getUserName() + ": " + le,
le);
}
}
/**
* Log a user in from a keytab file. Loads a user identity from a keytab
* file and login them in. This new user does not affect 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 if the keytab file can't be read
*/
public synchronized
static UserGroupInformation loginUserFromKeytabAndReturnUGI(String user,
String path
) throws IOException {
if (!isSecurityEnabled())
return UserGroupInformation.getCurrentUser();
String oldKeytabFile = null;
String oldKeytabPrincipal = null;
long start = 0;
try {
oldKeytabFile = keytabFile;
oldKeytabPrincipal = keytabPrincipal;
keytabFile = path;
keytabPrincipal = user;
Subject subject = new Subject();
LoginContext login = newLoginContext(
HadoopConfiguration.KEYTAB_KERBEROS_CONFIG_NAME, subject,
new HadoopConfiguration());
start = Time.now();
login.login();
metrics.loginSuccess.add(Time.now() - start);
UserGroupInformation newLoginUser = new UserGroupInformation(subject);
newLoginUser.setLogin(login);
newLoginUser.setAuthenticationMethod(AuthenticationMethod.KERBEROS);
return newLoginUser;
} catch (LoginException le) {
if (start > 0) {
metrics.loginFailure.add(Time.now() - start);
}
throw new IOException("Login failure for " + user + " from keytab " +
path + ": " + le, le);
} finally {
if(oldKeytabFile != null) keytabFile = oldKeytabFile;
if(oldKeytabPrincipal != null) keytabPrincipal = oldKeytabPrincipal;
}
}
private boolean hasSufficientTimeElapsed(long now) {
if (now - user.getLastLogin() < kerberosMinSecondsBeforeRelogin ) {
LOG.warn("Not attempting to re-login since the last re-login was " +
"attempted less than " + (kerberosMinSecondsBeforeRelogin/1000) +
" seconds before. Last Login=" + user.getLastLogin());
return false;
}
return true;
}
/**
* Did the login happen via keytab
* @return true or false
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public synchronized static boolean isLoginKeytabBased() throws IOException {
return getLoginUser().isKeytab;
}
/**
* Did the login happen via ticket cache
* @return true or false
*/
public static boolean isLoginTicketBased() throws IOException {
return getLoginUser().isKrbTkt;
}
/**
* Create a user from a login name. It is intended to be used for remote
* users in RPC, since it won't have any credentials.
* @param user the full user principal name, must not be empty or null
* @return the UserGroupInformation for the remote user.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static UserGroupInformation createRemoteUser(String user) {
return createRemoteUser(user, AuthMethod.SIMPLE);
}
/**
* Create a user from a login name. It is intended to be used for remote
* users in RPC, since it won't have any credentials.
* @param user the full user principal name, must not be empty or null
* @return the UserGroupInformation for the remote user.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static UserGroupInformation createRemoteUser(String user, AuthMethod authMethod) {
if (user == null || user.isEmpty()) {
throw new IllegalArgumentException("Null user");
}
Subject subject = new Subject();
subject.getPrincipals().add(new User(user));
UserGroupInformation result = new UserGroupInformation(subject);
result.setAuthenticationMethod(authMethod);
return result;
}
/**
* existing types of authentications' methods
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static enum AuthenticationMethod {
// currently we support only one auth per method, but eventually a
// subtype is needed to differentiate, ex. if digest is token or ldap
SIMPLE(AuthMethod.SIMPLE,
HadoopConfiguration.SIMPLE_CONFIG_NAME),
KERBEROS(AuthMethod.KERBEROS,
HadoopConfiguration.USER_KERBEROS_CONFIG_NAME),
TOKEN(AuthMethod.TOKEN),
CERTIFICATE(null),
KERBEROS_SSL(null),
PROXY(null);
private final AuthMethod authMethod;
private final String loginAppName;
private AuthenticationMethod(AuthMethod authMethod) {
this(authMethod, null);
}
private AuthenticationMethod(AuthMethod authMethod, String loginAppName) {
this.authMethod = authMethod;
this.loginAppName = loginAppName;
}
public AuthMethod getAuthMethod() {
return authMethod;
}
String getLoginAppName() {
if (loginAppName == null) {
throw new UnsupportedOperationException(
this + " login authentication is not supported");
}
return loginAppName;
}
public static AuthenticationMethod valueOf(AuthMethod authMethod) {
for (AuthenticationMethod value : values()) {
if (value.getAuthMethod() == authMethod) {
return value;
}
}
throw new IllegalArgumentException(
"no authentication method for " + authMethod);
}
};
/**
* Create a proxy user using username of the effective user and the ugi of the
* real user.
* @param user
* @param realUser
* @return proxyUser ugi
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static UserGroupInformation createProxyUser(String user,
UserGroupInformation realUser) {
if (user == null || user.isEmpty()) {
throw new IllegalArgumentException("Null user");
}
if (realUser == null) {
throw new IllegalArgumentException("Null real user");
}
Subject subject = new Subject();
Set<Principal> principals = subject.getPrincipals();
principals.add(new User(user));
principals.add(new RealUser(realUser));
UserGroupInformation result =new UserGroupInformation(subject);
result.setAuthenticationMethod(AuthenticationMethod.PROXY);
return result;
}
/**
* get RealUser (vs. EffectiveUser)
* @return realUser running over proxy user
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public UserGroupInformation getRealUser() {
for (RealUser p: subject.getPrincipals(RealUser.class)) {
return p.getRealUser();
}
return null;
}
/**
* This class is used for storing the groups for testing. It stores a local
* map that has the translation of usernames to groups.
*/
private static class TestingGroups extends Groups {
private final Map<String, List<String>> userToGroupsMapping =
new HashMap<String,List<String>>();
private Groups underlyingImplementation;
private TestingGroups(Groups underlyingImplementation) {
super(new org.apache.hadoop.conf.Configuration());
this.underlyingImplementation = underlyingImplementation;
}
@Override
public List<String> getGroups(String user) throws IOException {
List<String> result = userToGroupsMapping.get(user);
if (result == null) {
result = underlyingImplementation.getGroups(user);
}
return result;
}
private void setUserGroups(String user, String[] groups) {
userToGroupsMapping.put(user, Arrays.asList(groups));
}
}
/**
* Create a UGI for testing HDFS and MapReduce
* @param user the full user principal name
* @param userGroups the names of the groups that the user belongs to
* @return a fake user for running unit tests
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static UserGroupInformation createUserForTesting(String user,
String[] userGroups) {
ensureInitialized();
UserGroupInformation ugi = createRemoteUser(user);
// make sure that the testing object is setup
if (!(groups instanceof TestingGroups)) {
groups = new TestingGroups(groups);
}
// add the user groups
((TestingGroups) groups).setUserGroups(ugi.getShortUserName(), userGroups);
return ugi;
}
/**
* Create a proxy user UGI for testing HDFS and MapReduce
*
* @param user
* the full user principal name for effective user
* @param realUser
* UGI of the real user
* @param userGroups
* the names of the groups that the user belongs to
* @return a fake user for running unit tests
*/
public static UserGroupInformation createProxyUserForTesting(String user,
UserGroupInformation realUser, String[] userGroups) {
ensureInitialized();
UserGroupInformation ugi = createProxyUser(user, realUser);
// make sure that the testing object is setup
if (!(groups instanceof TestingGroups)) {
groups = new TestingGroups(groups);
}
// add the user groups
((TestingGroups) groups).setUserGroups(ugi.getShortUserName(), userGroups);
return ugi;
}
/**
* Get the user's login name.
* @return the user's name up to the first '/' or '@'.
*/
public String getShortUserName() {
for (User p: subject.getPrincipals(User.class)) {
return p.getShortName();
}
return null;
}
public String getPrimaryGroupName() throws IOException {
String[] groups = getGroupNames();
if (groups.length == 0) {
throw new IOException("There is no primary group for UGI " + this);
}
return groups[0];
}
/**
* Get the user's full principal name.
* @return the user's full principal name.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public String getUserName() {
return user.getName();
}
/**
* Add a TokenIdentifier to this UGI. The TokenIdentifier has typically been
* authenticated by the RPC layer as belonging to the user represented by this
* UGI.
*
* @param tokenId
* tokenIdentifier to be added
* @return true on successful add of new tokenIdentifier
*/
public synchronized boolean addTokenIdentifier(TokenIdentifier tokenId) {
return subject.getPublicCredentials().add(tokenId);
}
/**
* Get the set of TokenIdentifiers belonging to this UGI
*
* @return the set of TokenIdentifiers belonging to this UGI
*/
public synchronized Set<TokenIdentifier> getTokenIdentifiers() {
return subject.getPublicCredentials(TokenIdentifier.class);
}
/**
* Add a token to this UGI
*
* @param token Token to be added
* @return true on successful add of new token
*/
public boolean addToken(Token<? extends TokenIdentifier> token) {
return (token != null) ? addToken(token.getService(), token) : false;
}
/**
* Add a named token to this UGI
*
* @param alias Name of the token
* @param token Token to be added
* @return true on successful add of new token
*/
public boolean addToken(Text alias, Token<? extends TokenIdentifier> token) {
synchronized (subject) {
getCredentialsInternal().addToken(alias, token);
return true;
}
}
/**
* Obtain the collection of tokens associated with this user.
*
* @return an unmodifiable collection of tokens associated with user
*/
public Collection<Token<? extends TokenIdentifier>> getTokens() {
synchronized (subject) {
return Collections.unmodifiableCollection(
new ArrayList<Token<?>>(getCredentialsInternal().getAllTokens()));
}
}
/**
* Obtain the tokens in credentials form associated with this user.
*
* @return Credentials of tokens associated with this user
*/
public Credentials getCredentials() {
synchronized (subject) {
Credentials creds = new Credentials(getCredentialsInternal());
Iterator<Token<?>> iter = creds.getAllTokens().iterator();
while (iter.hasNext()) {
if (iter.next() instanceof Token.PrivateToken) {
iter.remove();
}
}
return creds;
}
}
/**
* Add the given Credentials to this user.
* @param credentials of tokens and secrets
*/
public void addCredentials(Credentials credentials) {
synchronized (subject) {
getCredentialsInternal().addAll(credentials);
}
}
private synchronized Credentials getCredentialsInternal() {
final Credentials credentials;
final Set<Credentials> credentialsSet =
subject.getPrivateCredentials(Credentials.class);
if (!credentialsSet.isEmpty()){
credentials = credentialsSet.iterator().next();
} else {
credentials = new Credentials();
subject.getPrivateCredentials().add(credentials);
}
return credentials;
}
/**
* Get the group names for this user.
* @return the list of users with the primary group first. If the command
* fails, it returns an empty list.
*/
public synchronized String[] getGroupNames() {
ensureInitialized();
try {
Set<String> result = new LinkedHashSet<String>
(groups.getGroups(getShortUserName()));
return result.toArray(new String[result.size()]);
} catch (IOException ie) {
if (LOG.isDebugEnabled()) {
LOG.debug("Failed to get groups for user " + getShortUserName()
+ " by " + ie);
LOG.trace("TRACE", ie);
}
return StringUtils.emptyStringArray;
}
}
/**
* Return the username.
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder(getUserName());
sb.append(" (auth:"+getAuthenticationMethod()+")");
if (getRealUser() != null) {
sb.append(" via ").append(getRealUser().toString());
}
return sb.toString();
}
/**
* Sets the authentication method in the subject
*
* @param authMethod
*/
public synchronized
void setAuthenticationMethod(AuthenticationMethod authMethod) {
user.setAuthenticationMethod(authMethod);
}
/**
* Sets the authentication method in the subject
*
* @param authMethod
*/
public void setAuthenticationMethod(AuthMethod authMethod) {
user.setAuthenticationMethod(AuthenticationMethod.valueOf(authMethod));
}
/**
* Get the authentication method from the subject
*
* @return AuthenticationMethod in the subject, null if not present.
*/
public synchronized AuthenticationMethod getAuthenticationMethod() {
return user.getAuthenticationMethod();
}
/**
* Get the authentication method from the real user's subject. If there
* is no real user, return the given user's authentication method.
*
* @return AuthenticationMethod in the subject, null if not present.
*/
public synchronized AuthenticationMethod getRealAuthenticationMethod() {
UserGroupInformation ugi = getRealUser();
if (ugi == null) {
ugi = this;
}
return ugi.getAuthenticationMethod();
}
/**
* Returns the authentication method of a ugi. If the authentication method is
* PROXY, returns the authentication method of the real user.
*
* @param ugi
* @return AuthenticationMethod
*/
public static AuthenticationMethod getRealAuthenticationMethod(
UserGroupInformation ugi) {
AuthenticationMethod authMethod = ugi.getAuthenticationMethod();
if (authMethod == AuthenticationMethod.PROXY) {
authMethod = ugi.getRealUser().getAuthenticationMethod();
}
return authMethod;
}
/**
* Compare the subjects to see if they are equal to each other.
*/
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
} else if (o == null || getClass() != o.getClass()) {
return false;
} else {
return subject == ((UserGroupInformation) o).subject;
}
}
/**
* Return the hash of the subject.
*/
@Override
public int hashCode() {
return System.identityHashCode(subject);
}
/**
* Get the underlying subject from this ugi.
* @return the subject that represents this user.
*/
protected Subject getSubject() {
return subject;
}
/**
* Run the given action as the user.
* @param <T> the return type of the run method
* @param action the method to execute
* @return the value from the run method
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public <T> T doAs(PrivilegedAction<T> action) {
logPrivilegedAction(subject, action);
return Subject.doAs(subject, action);
}
/**
* Run the given action as the user, potentially throwing an exception.
* @param <T> the return type of the run method
* @param action the method to execute
* @return the value from the run method
* @throws IOException if the action throws an IOException
* @throws Error if the action throws an Error
* @throws RuntimeException if the action throws a RuntimeException
* @throws InterruptedException if the action throws an InterruptedException
* @throws UndeclaredThrowableException if the action throws something else
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public <T> T doAs(PrivilegedExceptionAction<T> action
) throws IOException, InterruptedException {
try {
logPrivilegedAction(subject, action);
return Subject.doAs(subject, action);
} catch (PrivilegedActionException pae) {
Throwable cause = pae.getCause();
if (LOG.isDebugEnabled()) {
LOG.debug("PrivilegedActionException as:" + this + " cause:" + cause);
}
if (cause == null) {
throw new RuntimeException("PrivilegedActionException with no " +
"underlying cause. UGI [" + this + "]" +": " + pae, pae);
} else if (cause instanceof IOException) {
throw (IOException) cause;
} else if (cause instanceof Error) {
throw (Error) cause;
} else if (cause instanceof RuntimeException) {
throw (RuntimeException) cause;
} else if (cause instanceof InterruptedException) {
throw (InterruptedException) cause;
} else {
throw new UndeclaredThrowableException(cause);
}
}
}
private void logPrivilegedAction(Subject subject, Object action) {
if (LOG.isDebugEnabled()) {
// would be nice if action included a descriptive toString()
String where = new Throwable().getStackTrace()[2].toString();
LOG.debug("PrivilegedAction as:"+this+" from:"+where);
}
}
public static void logAllUserInfo(UserGroupInformation ugi) throws
IOException {
if (LOG.isDebugEnabled()) {
LOG.debug("UGI: " + ugi);
if (ugi.getRealUser() != null) {
LOG.debug("+RealUGI: " + ugi.getRealUser());
}
LOG.debug("+LoginUGI: " + ugi.getLoginUser());
for (Token<?> token : ugi.getTokens()) {
LOG.debug("+UGI token:" + token);
}
}
}
private void print() throws IOException {
System.out.println("User: " + getUserName());
System.out.print("Group Ids: ");
System.out.println();
String[] groups = getGroupNames();
System.out.print("Groups: ");
for(int i=0; i < groups.length; i++) {
System.out.print(groups[i] + " ");
}
System.out.println();
}
/**
* A test method to print out the current user's UGI.
* @param args if there are two arguments, read the user from the keytab
* and print it out.
* @throws Exception
*/
public static void main(String [] args) throws Exception {
System.out.println("Getting UGI for current user");
UserGroupInformation ugi = getCurrentUser();
ugi.print();
System.out.println("UGI: " + ugi);
System.out.println("Auth method " + ugi.user.getAuthenticationMethod());
System.out.println("Keytab " + ugi.isKeytab);
System.out.println("============================================================");
if (args.length == 2) {
System.out.println("Getting UGI from keytab....");
loginUserFromKeytab(args[0], args[1]);
getCurrentUser().print();
System.out.println("Keytab: " + ugi);
System.out.println("Auth method " + loginUser.user.getAuthenticationMethod());
System.out.println("Keytab " + loginUser.isKeytab);
}
}
}