| /** |
| * 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.kafka.common.security.authenticator; |
| |
| 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 javax.security.sasl.RealmCallback; |
| import javax.security.auth.callback.Callback; |
| import javax.security.auth.callback.CallbackHandler; |
| import javax.security.auth.callback.NameCallback; |
| import javax.security.auth.callback.PasswordCallback; |
| import javax.security.auth.callback.UnsupportedCallbackException; |
| import javax.security.auth.Subject; |
| |
| import org.apache.kafka.common.security.JaasUtils; |
| import org.apache.kafka.common.security.auth.Login; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Map; |
| |
| /** |
| * Base login class that implements methods common to typical SASL mechanisms. |
| */ |
| public abstract class AbstractLogin implements Login { |
| private static final Logger log = LoggerFactory.getLogger(AbstractLogin.class); |
| |
| private String loginContextName; |
| private LoginContext loginContext; |
| |
| |
| @Override |
| public void configure(Map<String, ?> configs, String loginContextName) { |
| this.loginContextName = loginContextName; |
| } |
| |
| @Override |
| public LoginContext login() throws LoginException { |
| String jaasConfigFile = System.getProperty(JaasUtils.JAVA_LOGIN_CONFIG_PARAM); |
| if (jaasConfigFile == null) { |
| log.debug("System property '" + JaasUtils.JAVA_LOGIN_CONFIG_PARAM + "' is not set, using default JAAS configuration."); |
| } |
| AppConfigurationEntry[] configEntries = Configuration.getConfiguration().getAppConfigurationEntry(loginContextName); |
| if (configEntries == null) { |
| String errorMessage = "Could not find a '" + loginContextName + "' entry in the JAAS configuration. System property '" + |
| JaasUtils.JAVA_LOGIN_CONFIG_PARAM + "' is " + (jaasConfigFile == null ? "not set" : jaasConfigFile); |
| throw new IllegalArgumentException(errorMessage); |
| } |
| |
| loginContext = new LoginContext(loginContextName, new LoginCallbackHandler()); |
| loginContext.login(); |
| log.info("Successfully logged in."); |
| return loginContext; |
| } |
| |
| @Override |
| public Subject subject() { |
| return loginContext.getSubject(); |
| } |
| |
| /** |
| * Callback handler for creating login context. Login callback handlers |
| * should support the callbacks required for the login modules used by |
| * the KafkaServer and KafkaClient contexts. Kafka does not support |
| * callback handlers which require additional user input. |
| * |
| */ |
| public static class LoginCallbackHandler implements CallbackHandler { |
| |
| @Override |
| public void handle(Callback[] callbacks) throws UnsupportedCallbackException { |
| for (Callback callback : callbacks) { |
| if (callback instanceof NameCallback) { |
| NameCallback nc = (NameCallback) callback; |
| nc.setName(nc.getDefaultName()); |
| } else if (callback instanceof PasswordCallback) { |
| String errorMessage = "Could not login: the client is being asked for a password, but the Kafka" + |
| " client code does not currently support obtaining a password from the user."; |
| throw new UnsupportedCallbackException(callback, errorMessage); |
| } else if (callback instanceof RealmCallback) { |
| RealmCallback rc = (RealmCallback) callback; |
| rc.setText(rc.getDefaultText()); |
| } else { |
| throw new UnsupportedCallbackException(callback, "Unrecognized SASL Login callback"); |
| } |
| } |
| } |
| } |
| } |
| |