| /** |
| * 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_SECURITY_AUTHENTICATION; |
| |
| 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.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import javax.security.auth.Subject; |
| import javax.security.auth.callback.CallbackHandler; |
| import javax.security.auth.kerberos.KerberosKey; |
| import javax.security.auth.kerberos.KerberosPrincipal; |
| import javax.security.auth.kerberos.KerberosTicket; |
| import javax.security.auth.login.AppConfigurationEntry; |
| import javax.security.auth.login.LoginContext; |
| import javax.security.auth.login.LoginException; |
| import javax.security.auth.login.AppConfigurationEntry.LoginModuleControlFlag; |
| import javax.security.auth.spi.LoginModule; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.security.token.Token; |
| import org.apache.hadoop.security.token.TokenIdentifier; |
| import org.apache.hadoop.util.Shell; |
| |
| import com.sun.security.auth.NTUserPrincipal; |
| import com.sun.security.auth.UnixPrincipal; |
| import com.sun.security.auth.module.Krb5LoginModule; |
| |
| /** |
| * 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. |
| */ |
| public class UserGroupInformation { |
| private static final Log LOG = LogFactory.getLog(UserGroupInformation.class); |
| /** |
| * Percentage of the ticket window to use before we renew ticket. |
| */ |
| private static final float TICKET_RENEW_WINDOW = 0.80f; |
| |
| /** |
| * A login module that looks at the Kerberos, Unix, or Windows principal and |
| * adds the corresponding UserName. |
| */ |
| 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 we already have a user, we are done. |
| if (!subject.getPrincipals(User.class).isEmpty()) { |
| return true; |
| } |
| Principal user = null; |
| // if we are using kerberos, try it out |
| if (useKerberos) { |
| user = getCanonicalUser(KerberosPrincipal.class); |
| } |
| // if we don't have a kerberos user, use the OS user |
| if (user == null) { |
| user = getCanonicalUser(OS_PRINCIPAL_CLASS); |
| } |
| // if we found the user, add our principal |
| if (user != null) { |
| subject.getPrincipals().add(new User(user.getName())); |
| 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 { |
| return true; |
| } |
| |
| @Override |
| public boolean logout() throws LoginException { |
| return true; |
| } |
| } |
| |
| /** Metrics to track UGI activity */ |
| static UgiInstrumentation metrics; |
| /** Are the static variables that depend on configuration initialized? */ |
| private static boolean isInitialized = false; |
| /** Should we use Kerberos configuration? */ |
| private static boolean useKerberos; |
| /** Server-side groups fetching service */ |
| private static Groups groups; |
| /** The configuration to use */ |
| private static Configuration conf; |
| |
| /** Leave 10 minutes between relogin attempts. */ |
| private static final long MIN_TIME_BEFORE_RELOGIN = 10 * 60 * 1000L; |
| |
| /**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 synchronized void ensureInitialized() { |
| if (!isInitialized) { |
| initialize(new Configuration()); |
| } |
| } |
| |
| /** |
| * Set the configuration values for UGI. |
| * @param conf the configuration to use |
| */ |
| private static synchronized void initialize(Configuration conf) { |
| String value = conf.get(HADOOP_SECURITY_AUTHENTICATION); |
| if (value == null || "simple".equals(value)) { |
| useKerberos = false; |
| } else if ("kerberos".equals(value)) { |
| useKerberos = true; |
| } else { |
| throw new IllegalArgumentException("Invalid attribute value for " + |
| HADOOP_SECURITY_AUTHENTICATION + |
| " of " + value); |
| } |
| // If we haven't set up testing groups, use the configuration to find it |
| if (!(groups instanceof TestingGroups)) { |
| groups = Groups.getUserToGroupsMappingService(conf); |
| } |
| // Set the configuration for JAAS to be the Hadoop configuration. |
| // This is done here rather than a static initializer to avoid a |
| // circular dependence. |
| javax.security.auth.login.Configuration.setConfiguration |
| (new HadoopConfiguration()); |
| // give the configuration on how to translate Kerberos names |
| try { |
| KerberosName.setConfiguration(conf); |
| } catch (IOException ioe) { |
| throw new RuntimeException("Problem with Kerberos auth_to_local name " + |
| "configuration", ioe); |
| } |
| isInitialized = true; |
| UserGroupInformation.conf = conf; |
| metrics = UgiInstrumentation.create(conf); |
| } |
| |
| /** |
| * 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 |
| */ |
| public static void setConfiguration(Configuration conf) { |
| initialize(conf); |
| } |
| |
| /** |
| * 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() { |
| ensureInitialized(); |
| return useKerberos; |
| } |
| |
| /** |
| * 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 final String OS_LOGIN_MODULE_NAME; |
| private static final Class<? extends Principal> OS_PRINCIPAL_CLASS; |
| private static final boolean windows = |
| System.getProperty("os.name").startsWith("Windows"); |
| private static Thread renewerThread = null; |
| private static volatile boolean shouldRunRenewerThread = true; |
| |
| static { |
| if (windows) { |
| OS_LOGIN_MODULE_NAME = "com.sun.security.auth.module.NTLoginModule"; |
| OS_PRINCIPAL_CLASS = NTUserPrincipal.class; |
| } else { |
| OS_LOGIN_MODULE_NAME = "com.sun.security.auth.module.UnixLoginModule"; |
| OS_PRINCIPAL_CLASS = UnixPrincipal.class; |
| } |
| } |
| |
| private static class RealUser implements Principal { |
| private final UserGroupInformation realUser; |
| |
| RealUser(UserGroupInformation realUser) { |
| this.realUser = realUser; |
| } |
| |
| 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 AppConfigurationEntry OS_SPECIFIC_LOGIN = |
| new AppConfigurationEntry(OS_LOGIN_MODULE_NAME, |
| LoginModuleControlFlag.REQUIRED, |
| new HashMap<String,String>()); |
| private static final AppConfigurationEntry HADOOP_LOGIN = |
| new AppConfigurationEntry(HadoopLoginModule.class.getName(), |
| LoginModuleControlFlag.REQUIRED, |
| new HashMap<String,String>()); |
| private static final Map<String,String> USER_KERBEROS_OPTIONS = |
| new HashMap<String,String>(); |
| static { |
| USER_KERBEROS_OPTIONS.put("doNotPrompt", "true"); |
| USER_KERBEROS_OPTIONS.put("useTicketCache", "true"); |
| USER_KERBEROS_OPTIONS.put("renewTGT", "true"); |
| String ticketCache = System.getenv("KRB5CCNAME"); |
| if (ticketCache != null) { |
| USER_KERBEROS_OPTIONS.put("ticketCache", ticketCache); |
| } |
| } |
| private static final AppConfigurationEntry USER_KERBEROS_LOGIN = |
| new AppConfigurationEntry(Krb5LoginModule.class.getName(), |
| LoginModuleControlFlag.OPTIONAL, |
| USER_KERBEROS_OPTIONS); |
| private static final Map<String,String> KEYTAB_KERBEROS_OPTIONS = |
| new HashMap<String,String>(); |
| static { |
| KEYTAB_KERBEROS_OPTIONS.put("doNotPrompt", "true"); |
| KEYTAB_KERBEROS_OPTIONS.put("useKeyTab", "true"); |
| KEYTAB_KERBEROS_OPTIONS.put("storeKey", "true"); |
| } |
| private static final AppConfigurationEntry KEYTAB_KERBEROS_LOGIN = |
| new AppConfigurationEntry(Krb5LoginModule.class.getName(), |
| 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)) { |
| KEYTAB_KERBEROS_OPTIONS.put("keyTab", keytabFile); |
| KEYTAB_KERBEROS_OPTIONS.put("principal", keytabPrincipal); |
| return KEYTAB_KERBEROS_CONF; |
| } |
| return null; |
| } |
| } |
| |
| 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 = subject; |
| this.user = subject.getPrincipals(User.class).iterator().next(); |
| this.isKeytab = !subject.getPrivateCredentials(KerberosKey.class).isEmpty(); |
| this.isKrbTkt = !subject.getPrivateCredentials(KerberosTicket.class).isEmpty(); |
| } |
| |
| /** |
| * 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 |
| */ |
| public static UserGroupInformation getCurrentUser() throws IOException { |
| AccessControlContext context = AccessController.getContext(); |
| Subject subject = Subject.getSubject(context); |
| // As the Apache Karaf provides the Subject by default, we need to make sure hadoopcan get the User.class information first |
| if (subject != null && subject.getPrincipals(User.class).iterator().hasNext()) { |
| return new UserGroupInformation(subject); |
| } |
| return getLoginUser(); |
| } |
| |
| /** |
| * Get the currently logged in user. |
| * @return the logged in user |
| * @throws IOException if login fails |
| */ |
| public synchronized |
| static UserGroupInformation getLoginUser() throws IOException { |
| if (loginUser == null) { |
| try { |
| Subject subject = new Subject(); |
| LoginContext login; |
| if (isSecurityEnabled()) { |
| login = new LoginContext(HadoopConfiguration.USER_KERBEROS_CONFIG_NAME, subject); |
| } else { |
| login = new LoginContext(HadoopConfiguration.SIMPLE_CONFIG_NAME, subject); |
| } |
| login.login(); |
| loginUser = new UserGroupInformation(subject); |
| loginUser.setLogin(login); |
| loginUser.setAuthenticationMethod(isSecurityEnabled() ? |
| AuthenticationMethod.KERBEROS : |
| AuthenticationMethod.SIMPLE); |
| loginUser = new UserGroupInformation(login.getSubject()); |
| String fileLocation = System.getenv(HADOOP_TOKEN_FILE_LOCATION); |
| if (fileLocation != null && isSecurityEnabled()) { |
| // load the token storage file and put all of the tokens into the |
| // user. |
| Credentials cred = Credentials.readTokenStorageFile( |
| new Path("file:///" + fileLocation), conf); |
| for (Token<?> token: cred.getAllTokens()) { |
| loginUser.addToken(token); |
| } |
| } |
| loginUser.spawnAutoRenewalThreadForUserCreds(); |
| } catch (LoginException le) { |
| throw new IOException("failure to login", le); |
| } |
| } |
| return loginUser; |
| } |
| |
| /** |
| * 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) { |
| KerberosPrincipal server = ticket.getServer(); |
| if (server.getName().equals("krbtgt/" + server.getRealm() + |
| "@" + server.getRealm())) { |
| 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) { |
| renewerThread = new Thread(new Runnable() { |
| |
| public void run() { |
| String cmd = conf.get("hadoop.kerberos.kinit.command", |
| "/usr/kerberos/bin/kinit"); |
| KerberosTicket tgt = getTGT(); |
| if (tgt == null) { |
| return; |
| } |
| long nextRefresh = getRefreshTime(tgt); |
| while (shouldRunRenewerThread) { |
| try { |
| long now = System.currentTimeMillis(); |
| LOG.debug("Current time is " + now); |
| LOG.debug("Next refresh is " + nextRefresh); |
| if (now < nextRefresh) { |
| Thread.sleep(nextRefresh - now); |
| } |
| Shell.execCommand(cmd, "-R"); |
| 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 + MIN_TIME_BEFORE_RELOGIN); |
| } catch (InterruptedException ie) { |
| LOG.warn("Terminating renewal thread"); |
| return; |
| } catch (IOException ie) { |
| LOG.warn("Exception encountered while running the" + |
| " renewal command." + ie + |
| ". Aborting renew thread for " + user); |
| return; |
| } |
| } |
| LOG.info("TGT renewer thread exiting."); |
| } |
| }); |
| renewerThread.setDaemon(true); |
| renewerThread.setName("TGT Renewer for " + getUserName()); |
| renewerThread.start(); |
| } |
| } |
| } |
| /** |
| * 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 |
| */ |
| 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; |
| // The renewer thread might have been spawned earlier if getLoginUser |
| // was called with the loginUser as null. |
| // Just kill the thread. BTW loginUser is not null anymore and any |
| // future call to getLoginUser will not spawn the thread. |
| if (renewerThread != null) { |
| renewerThread.interrupt(); |
| shouldRunRenewerThread = false; |
| renewerThread = null; |
| LOG.info("Asked the TGT renewer thread to terminate"); |
| } |
| try { |
| login = |
| new LoginContext(HadoopConfiguration.KEYTAB_KERBEROS_CONFIG_NAME, subject); |
| start = System.currentTimeMillis(); |
| login.login(); |
| metrics.addLoginSuccess(System.currentTimeMillis() - start); |
| loginUser = new UserGroupInformation(subject); |
| loginUser.setLogin(login); |
| loginUser.setAuthenticationMethod(AuthenticationMethod.KERBEROS); |
| } catch (LoginException le) { |
| if (start > 0) { |
| metrics.addLoginFailure(System.currentTimeMillis() - start); |
| } |
| throw new IOException("Login failure for " + user + " from keytab " + |
| path, le); |
| } |
| LOG.info("Login successful for user " + keytabPrincipal |
| + " using keytab file " + keytabFile); |
| } |
| /** |
| * 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 |
| */ |
| 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"); |
| } |
| if (!hasSufficientTimeElapsed()) { |
| return; |
| } |
| try { |
| LOG.info("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 = |
| new LoginContext(HadoopConfiguration.USER_KERBEROS_CONFIG_NAME, |
| getSubject()); |
| LOG.info("Initiating re-login for " + getUserName()); |
| login.login(); |
| setLogin(login); |
| } catch (LoginException le) { |
| throw new IOException("Login failure for " + getUserName(), 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 = |
| new LoginContext(HadoopConfiguration.KEYTAB_KERBEROS_CONFIG_NAME, subject); |
| |
| start = System.currentTimeMillis(); |
| login.login(); |
| metrics.addLoginSuccess(System.currentTimeMillis() - start); |
| UserGroupInformation newLoginUser = new UserGroupInformation(subject); |
| newLoginUser.setLogin(login); |
| newLoginUser.setAuthenticationMethod(AuthenticationMethod.KERBEROS); |
| |
| return newLoginUser; |
| } catch (LoginException le) { |
| if (start > 0) { |
| metrics.addLoginFailure(System.currentTimeMillis() - start); |
| } |
| throw new IOException("Login failure for " + user + " from keytab " + |
| path, le); |
| } finally { |
| if(oldKeytabFile != null) keytabFile = oldKeytabFile; |
| if(oldKeytabPrincipal != null) keytabPrincipal = oldKeytabPrincipal; |
| } |
| } |
| |
| /** |
| * Re-login a user from keytab if TGT is expired or is close to expiry. |
| * |
| * @throws IOException |
| */ |
| public synchronized void checkTGTAndReloginFromKeytab() throws IOException { |
| //TODO: The method reloginFromKeytab should be refactored to use this |
| // implementation. |
| if (!isSecurityEnabled() |
| || user.getAuthenticationMethod() != AuthenticationMethod.KERBEROS |
| || !isKeytab) |
| return; |
| KerberosTicket tgt = getTGT(); |
| if (tgt != null && System.currentTimeMillis() < getRefreshTime(tgt)) { |
| return; |
| } |
| reloginFromKeytab(); |
| } |
| |
| /** |
| * 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 |
| */ |
| public synchronized void reloginFromKeytab() |
| throws IOException { |
| if (!isSecurityEnabled() || |
| user.getAuthenticationMethod() != AuthenticationMethod.KERBEROS || |
| !isKeytab) |
| return; |
| LoginContext login = getLogin(); |
| if (login == null || keytabFile == null) { |
| throw new IOException("loginUserFromKeyTab must be done first"); |
| } |
| if (!hasSufficientTimeElapsed()) { |
| return; |
| } |
| long start = 0; |
| try { |
| LOG.info("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 = |
| new LoginContext(HadoopConfiguration.KEYTAB_KERBEROS_CONFIG_NAME, |
| getSubject()); |
| LOG.info("Initiating re-login for " + keytabPrincipal); |
| start = System.currentTimeMillis(); |
| login.login(); |
| metrics.addLoginSuccess(System.currentTimeMillis() - start); |
| setLogin(login); |
| } |
| } catch (LoginException le) { |
| if (start > 0) { |
| metrics.addLoginFailure(System.currentTimeMillis() - start); |
| } |
| throw new IOException("Login failure for " + keytabPrincipal + |
| " from keytab " + keytabFile, le); |
| } |
| } |
| |
| private boolean hasSufficientTimeElapsed() { |
| long now = System.currentTimeMillis(); |
| if (now - user.getLastLogin() < MIN_TIME_BEFORE_RELOGIN ) { |
| LOG.warn("Not attempting to re-login since the last re-login was " + |
| "attempted less than " + (MIN_TIME_BEFORE_RELOGIN/1000) + " seconds"+ |
| " before."); |
| return false; |
| } |
| // register most recent relogin attempt |
| user.setLastLogin(now); |
| return true; |
| } |
| |
| /** |
| * Did the login happen via keytab |
| * @return true or false |
| */ |
| public synchronized static boolean isLoginKeytabBased() throws IOException { |
| return getLoginUser().isKeytab; |
| } |
| |
| /** |
| * 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. |
| */ |
| public static UserGroupInformation createRemoteUser(String user) { |
| if (user == null || "".equals(user)) { |
| throw new IllegalArgumentException("Null user"); |
| } |
| Subject subject = new Subject(); |
| subject.getPrincipals().add(new User(user)); |
| UserGroupInformation result = new UserGroupInformation(subject); |
| result.setAuthenticationMethod(AuthenticationMethod.SIMPLE); |
| return result; |
| } |
| |
| /** |
| * existing types of authentications' methods |
| */ |
| public static enum AuthenticationMethod { |
| SIMPLE, |
| KERBEROS, |
| TOKEN, |
| CERTIFICATE, |
| KERBEROS_SSL, |
| PROXY; |
| } |
| |
| /** |
| * Create a proxy user using username of the effective user and the ugi of the |
| * real user. |
| * @param user |
| * @param realUser |
| * @return proxyUser ugi |
| */ |
| public static UserGroupInformation createProxyUser(String user, |
| UserGroupInformation realUser) { |
| if (user == null || "".equals(user)) { |
| 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 |
| */ |
| 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 TestingGroups() { |
| super(new org.apache.hadoop.conf.Configuration()); |
| } |
| |
| @Override |
| public List<String> getGroups(String user) { |
| List<String> result = userToGroupsMapping.get(user); |
| if (result == null) { |
| result = new ArrayList<String>(); |
| } |
| 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 |
| */ |
| 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(); |
| } |
| // 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(); |
| } |
| // 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; |
| } |
| |
| /** |
| * Get the user's full principal name. |
| * @return the user's full principal name. |
| */ |
| 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 synchronized boolean addToken(Token<? extends TokenIdentifier> token) { |
| return subject.getPrivateCredentials().add(token); |
| } |
| |
| /** |
| * Obtain the collection of tokens associated with this user. |
| * |
| * @return an unmodifiable collection of tokens associated with user |
| */ |
| public synchronized |
| Collection<Token<? extends TokenIdentifier>> getTokens() { |
| Set<Object> creds = subject.getPrivateCredentials(); |
| List<Token<?>> result = new ArrayList<Token<?>>(creds.size()); |
| for(Object o: creds) { |
| if (o instanceof Token<?>) { |
| result.add((Token<?>) o); |
| } |
| } |
| return Collections.unmodifiableList(result); |
| } |
| |
| /** |
| * 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 { |
| List<String> result = groups.getGroups(getShortUserName()); |
| return result.toArray(new String[result.size()]); |
| } catch (IOException ie) { |
| LOG.warn("No groups available for user " + getShortUserName()); |
| return new String[0]; |
| } |
| } |
| |
| /** |
| * Return the username. |
| */ |
| @Override |
| public String toString() { |
| if (getRealUser() != null) { |
| return getUserName() + " via " + getRealUser().toString(); |
| } else { |
| return getUserName(); |
| } |
| } |
| |
| /** |
| * Sets the authentication method in the subject |
| * |
| * @param authMethod |
| */ |
| public synchronized |
| void setAuthenticationMethod(AuthenticationMethod authMethod) { |
| user.setAuthenticationMethod(authMethod); |
| } |
| |
| /** |
| * Get the authentication method from the subject |
| * |
| * @return AuthenticationMethod in the subject, null if not present. |
| */ |
| public synchronized AuthenticationMethod getAuthenticationMethod() { |
| return user.getAuthenticationMethod(); |
| } |
| |
| /** |
| * 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 |
| */ |
| public <T> T doAs(PrivilegedAction<T> 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 |
| */ |
| public <T> T doAs(PrivilegedExceptionAction<T> action |
| ) throws IOException, InterruptedException { |
| try { |
| return Subject.doAs(subject, action); |
| } catch (PrivilegedActionException pae) { |
| Throwable cause = pae.getCause(); |
| 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(pae,"Unknown exception in doAs"); |
| } |
| } |
| } |
| |
| 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); |
| } |
| } |
| |
| } |
| |