Categories:
Audio (13)
Biotech (29)
Bytecode (36)
Database (77)
Framework (7)
Game (7)
General (507)
Graphics (53)
I/O (35)
IDE (2)
JAR Tools (101)
JavaBeans (21)
JDBC (121)
JDK (426)
JSP (20)
Logging (108)
Mail (58)
Messaging (8)
Network (84)
PDF (97)
Report (7)
Scripting (84)
Security (32)
Server (121)
Servlet (26)
SOAP (24)
Testing (54)
Web (15)
XML (309)
Collections:
Other Resources:
Apache ZooKeeper 3.7.0 Server Source Code
Apache ZooKeeper is an open-source server which enables highly
reliable distributed coordination.
Apache ZooKeeper Server Source Code files are provided in the source packge (apache-zookeeper-3.7.0.tar.gz). You can download it at Apache ZooKeeper Website.
You can also browse Apache ZooKeeper Server Source Code below:
✍: FYIcenter.com
⏎ org/apache/zookeeper/Login.java
/* * 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.zookeeper; /** * This class is responsible for refreshing Kerberos credentials for * logins for both Zookeeper client and server. * See ZooKeeperSaslServer for server-side usage. * See ZooKeeperSaslClient for client-side usage. */ import java.util.Date; import java.util.Set; import java.util.concurrent.ThreadLocalRandom; 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.Configuration; import javax.security.auth.login.LoginContext; import javax.security.auth.login.LoginException; import org.apache.zookeeper.client.ZKClientConfig; import org.apache.zookeeper.common.Time; import org.apache.zookeeper.common.ZKConfig; import org.apache.zookeeper.server.ZooKeeperSaslServer; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class Login { private static final String KINIT_COMMAND_DEFAULT = "/usr/bin/kinit"; private static final Logger LOG = LoggerFactory.getLogger(Login.class); public static final String SYSTEM_USER = System.getProperty("user.name", "<NA>"); public CallbackHandler callbackHandler; // LoginThread will sleep until 80% of time from last refresh to // ticket's expiry has been reached, at which time it will wake // and try to renew the ticket. private static final float TICKET_RENEW_WINDOW = 0.80f; /** * Percentage of random jitter added to the renewal time */ private static final float TICKET_RENEW_JITTER = 0.05f; // Regardless of TICKET_RENEW_WINDOW setting above and the ticket expiry time, // thread will not sleep between refresh attempts any less than 1 minute (60*1000 milliseconds = 1 minute). // Change the '1' to e.g. 5, to change this to 5 minutes. private static final long MIN_TIME_BEFORE_RELOGIN = 1 * 60 * 1000L; private Subject subject = null; private Thread t = null; private boolean isKrbTicket = false; private boolean isUsingTicketCache = false; private LoginContext login = null; private String loginContextName = null; private String principal = null; // Initialize 'lastLogin' to do a login at first time private long lastLogin = Time.currentElapsedTime() - MIN_TIME_BEFORE_RELOGIN; private final ZKConfig zkConfig; /** * LoginThread constructor. The constructor starts the thread used to * periodically re-login to the Kerberos Ticket Granting Server. * * @param loginContextName * name of section in JAAS file that will be use to login. Passed * as first param to javax.security.auth.login.LoginContext(). * * @param callbackHandler * Passed as second param to * javax.security.auth.login.LoginContext(). * @param zkConfig * client or server configurations * @throws javax.security.auth.login.LoginException * Thrown if authentication fails. */ public Login(final String loginContextName, CallbackHandler callbackHandler, final ZKConfig zkConfig) throws LoginException { this.zkConfig = zkConfig; this.callbackHandler = callbackHandler; login = login(loginContextName); this.loginContextName = loginContextName; subject = login.getSubject(); isKrbTicket = !subject.getPrivateCredentials(KerberosTicket.class).isEmpty(); AppConfigurationEntry[] entries = Configuration.getConfiguration().getAppConfigurationEntry(loginContextName); for (AppConfigurationEntry entry : entries) { // there will only be a single entry, so this for() loop will only be iterated through once. if (entry.getOptions().get("useTicketCache") != null) { String val = (String) entry.getOptions().get("useTicketCache"); if (val.equals("true")) { isUsingTicketCache = true; } } if (entry.getOptions().get("principal") != null) { principal = (String) entry.getOptions().get("principal"); } break; } if (!isKrbTicket) { // if no TGT, do not bother with ticket management. return; } // Refresh the Ticket Granting Ticket (TGT) periodically. How often to refresh is determined by the // TGT's existing expiry date and the configured MIN_TIME_BEFORE_RELOGIN. For testing and development, // you can decrease the interval of expiration of tickets (for example, to 3 minutes) by running : // "modprinc -maxlife 3mins <principal>" in kadmin. t = new Thread(new Runnable() { public void run() { LOG.info("TGT refresh thread started."); while (true) { // renewal thread's main loop. if it exits from here, thread will exit. KerberosTicket tgt = getTGT(); long now = Time.currentWallTime(); long nextRefresh; Date nextRefreshDate; if (tgt == null) { nextRefresh = now + MIN_TIME_BEFORE_RELOGIN; nextRefreshDate = new Date(nextRefresh); LOG.warn("No TGT found: will try again at {}", nextRefreshDate); } else { nextRefresh = getRefreshTime(tgt); long expiry = tgt.getEndTime().getTime(); Date expiryDate = new Date(expiry); if ((isUsingTicketCache) && (tgt.getEndTime().equals(tgt.getRenewTill()))) { LOG.error( "The TGT cannot be renewed beyond the next expiry date: {}." + "This process will not be able to authenticate new SASL connections after that " + "time (for example, it will not be authenticate a new connection with a Zookeeper " + "Quorum member). Ask your system administrator to either increase the " + "'renew until' time by doing : 'modprinc -maxrenewlife {}' within " + "kadmin, or instead, to generate a keytab for {}. Because the TGT's " + "expiry cannot be further extended by refreshing, exiting refresh thread now.", expiryDate, principal, principal); return; } // determine how long to sleep from looking at ticket's expiry. // We should not allow the ticket to expire, but we should take into consideration // MIN_TIME_BEFORE_RELOGIN. Will not sleep less than MIN_TIME_BEFORE_RELOGIN, unless doing so // would cause ticket expiration. if ((nextRefresh > expiry) || ((now + MIN_TIME_BEFORE_RELOGIN) > expiry)) { // expiry is before next scheduled refresh). nextRefresh = now; } else { if (nextRefresh < (now + MIN_TIME_BEFORE_RELOGIN)) { // next scheduled refresh is sooner than (now + MIN_TIME_BEFORE_LOGIN). Date until = new Date(nextRefresh); Date newuntil = new Date(now + MIN_TIME_BEFORE_RELOGIN); LOG.warn( "TGT refresh thread time adjusted from : {} to : {} since " + "the former is sooner than the minimum refresh interval (" + "{} seconds) from now.", until, newuntil, (MIN_TIME_BEFORE_RELOGIN / 1000)); } nextRefresh = Math.max(nextRefresh, now + MIN_TIME_BEFORE_RELOGIN); } nextRefreshDate = new Date(nextRefresh); if (nextRefresh > expiry) { LOG.error( "next refresh: {} is later than expiry {}." + " This may indicate a clock skew problem." + " Check that this host and the KDC's " + "hosts' clocks are in sync. Exiting refresh thread.", nextRefreshDate, expiryDate); return; } } if (now == nextRefresh) { LOG.info("refreshing now because expiry is before next scheduled refresh time."); } else if (now < nextRefresh) { Date until = new Date(nextRefresh); LOG.info("TGT refresh sleeping until: {}", until.toString()); try { Thread.sleep(nextRefresh - now); } catch (InterruptedException ie) { LOG.warn("TGT renewal thread has been interrupted and will exit."); break; } } else { LOG.error( "nextRefresh:{} is in the past: exiting refresh thread. Check" + " clock sync between this host and KDC - (KDC's clock is likely ahead of this host)." + " Manual intervention will be required for this client to successfully authenticate." + " Exiting refresh thread.", nextRefreshDate); break; } if (isUsingTicketCache) { String cmd = zkConfig.getProperty(ZKConfig.KINIT_COMMAND, KINIT_COMMAND_DEFAULT); String kinitArgs = "-R"; int retry = 1; while (retry >= 0) { try { LOG.debug("running ticket cache refresh command: {} {}", cmd, kinitArgs); Shell.execCommand(cmd, kinitArgs); break; } catch (Exception e) { if (retry > 0) { --retry; // sleep for 10 seconds try { Thread.sleep(10 * 1000); } catch (InterruptedException ie) { LOG.error("Interrupted while renewing TGT, exiting Login thread"); return; } } else { LOG.warn( "Could not renew TGT due to problem running shell command: '{} {}'." + " Exiting refresh thread.", cmd, kinitArgs, e); return; } } } } try { int retry = 1; while (retry >= 0) { try { reLogin(); break; } catch (LoginException le) { if (retry > 0) { --retry; // sleep for 10 seconds. try { Thread.sleep(10 * 1000); } catch (InterruptedException e) { LOG.error("Interrupted during login retry after LoginException:", le); throw le; } } else { LOG.error("Could not refresh TGT for principal: {}.", principal, le); } } } } catch (LoginException le) { LOG.error("Failed to refresh TGT: refresh thread exiting now.", le); break; } } } }); t.setDaemon(true); } public void startThreadIfNeeded() { // thread object 't' will be null if a refresh thread is not needed. if (t != null) { t.start(); } } public void shutdown() { if ((t != null) && (t.isAlive())) { t.interrupt(); try { t.join(); } catch (InterruptedException e) { LOG.warn("error while waiting for Login thread to shutdown.", e); } } } public Subject getSubject() { return subject; } public String getUserName() { if (principal == null || principal.isEmpty()) { return SYSTEM_USER; } return principal; } public String getLoginContextName() { return loginContextName; } private synchronized LoginContext login(final String loginContextName) throws LoginException { if (loginContextName == null) { throw new LoginException("loginContext name (JAAS file section header) was null. " + "Please check your java.security.login.auth.config (=" + System.getProperty("java.security.login.auth.config") + ") and your " + getLoginContextMessage()); } LoginContext loginContext = new LoginContext(loginContextName, callbackHandler); loginContext.login(); LOG.info("{} successfully logged in.", loginContextName); return loginContext; } private String getLoginContextMessage() { if (zkConfig instanceof ZKClientConfig) { return ZKClientConfig.LOGIN_CONTEXT_NAME_KEY + "(=" + zkConfig.getProperty(ZKClientConfig.LOGIN_CONTEXT_NAME_KEY, ZKClientConfig.LOGIN_CONTEXT_NAME_KEY_DEFAULT) + ")"; } else { return ZooKeeperSaslServer.LOGIN_CONTEXT_NAME_KEY + "(=" + System.getProperty(ZooKeeperSaslServer.LOGIN_CONTEXT_NAME_KEY, ZooKeeperSaslServer.DEFAULT_LOGIN_CONTEXT_NAME) + ")"; } } // c.f. org.apache.hadoop.security.UserGroupInformation. private long getRefreshTime(KerberosTicket tgt) { long start = tgt.getStartTime().getTime(); long expires = tgt.getEndTime().getTime(); LOG.info("TGT valid starting at: {}", tgt.getStartTime().toString()); LOG.info("TGT expires: {}", tgt.getEndTime().toString()); long proposedRefresh = start + (long) ((expires - start) * (TICKET_RENEW_WINDOW + (TICKET_RENEW_JITTER * ThreadLocalRandom.current().nextDouble()))); if (proposedRefresh > expires) { // proposedRefresh is too far in the future: it's after ticket expires: simply return now. return Time.currentWallTime(); } else { return proposedRefresh; } } 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())) { LOG.debug("Client principal is \"{}\".", ticket.getClient().getName()); LOG.debug("Server principal is \"{}\".", ticket.getServer().getName()); return ticket; } } return null; } private boolean hasSufficientTimeElapsed() { long now = Time.currentElapsedTime(); if (now - getLastLogin() < MIN_TIME_BEFORE_RELOGIN) { LOG.warn("Not attempting to re-login since the last re-login was " + "attempted less than {} seconds before.", (MIN_TIME_BEFORE_RELOGIN / 1000)); return false; } // register most recent relogin attempt setLastLogin(now); return true; } /** * Returns login object * @return login */ private LoginContext getLogin() { return login; } /** * Set the login object * @param login */ private void setLogin(LoginContext login) { this.login = login; } /** * Set the last login time. * @param time the number of milliseconds since the beginning of time */ private void setLastLogin(long time) { lastLogin = time; } /** * Get the time of the last login. * @return the number of milliseconds since the beginning of time. */ private long getLastLogin() { return lastLogin; } /** * Re-login a principal. This method assumes that {@link #login(String)} has happened already. * @throws javax.security.auth.login.LoginException on a failure */ // c.f. HADOOP-6559 private synchronized void reLogin() throws LoginException { if (!isKrbTicket) { return; } LoginContext login = getLogin(); if (login == null) { throw new LoginException("login must be done first"); } if (!hasSufficientTimeElapsed()) { return; } LOG.info("Initiating logout for {}", principal); synchronized (Login.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(loginContextName, getSubject()); LOG.info("Initiating re-login for {}", principal); login.login(); setLogin(login); } } }
⏎ org/apache/zookeeper/Login.java
Or download all of them as a single archive file:
File name: zookeeper-server-3.7.0-fyi.zip File size: 871011 bytes Release date: 2021-05-17 Download
⇒ Apache ZooKeeper 3.7.0 Jute Source Code
⇐ Download Apache ZooKeeper 3.7.0 Source Package
2022-11-16, 24881👍, 0💬
Popular Posts:
Commons Pool provides an Object-pooling API, with three major aspects: 1. A generic object pool inte...
Provides support for the runtime platform, core utility methods and the extension registry. JAR File...
Apache BCEL Source Code Files are inside the Apache BCEL source package file like bcel-6.5.0-src.zip...
What Is jsse.jar (JDK 6) Java Secure Socket Extension? jsse.jar, Java Secure Socket Extension, is Ja...
The JMX technology provides the tools for building distributed, Web-based, modular and dynamic solut...