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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.common.security.authenticator;
import org.apache.kafka.common.config.ConfigException;
import org.apache.kafka.common.config.SaslConfigs;
import org.apache.kafka.common.config.types.Password;
import org.apache.kafka.common.network.ListenerName;
import org.apache.kafka.common.security.JaasContext;
import org.apache.kafka.common.security.auth.AuthenticateCallbackHandler;
import org.apache.kafka.common.security.auth.Login;
import org.apache.kafka.common.security.oauthbearer.OAuthBearerLoginModule;
import org.apache.kafka.common.security.oauthbearer.internals.unsecured.OAuthBearerUnsecuredLoginCallbackHandler;
import org.apache.kafka.common.utils.SecurityUtils;
import org.apache.kafka.common.utils.Utils;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
import javax.security.auth.Subject;
import javax.security.auth.login.LoginException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
public class LoginManager {
private static final Logger LOGGER = LogManager.getLogger(LoginManager.class);
// static configs (broker or client)
private static final Map, LoginManager> STATIC_INSTANCES = new HashMap<>();
// dynamic configs (broker or client)
private static final Map, LoginManager> DYNAMIC_INSTANCES = new HashMap<>();
private final Login login;
private final LoginMetadata loginMetadata;
private final AuthenticateCallbackHandler loginCallbackHandler;
private int refCount;
private LoginManager(JaasContext jaasContext, String saslMechanism, Map configs,
LoginMetadata loginMetadata) throws LoginException {
this.loginMetadata = loginMetadata;
this.login = Utils.newInstance(loginMetadata.loginClass);
loginCallbackHandler = Utils.newInstance(loginMetadata.loginCallbackClass);
loginCallbackHandler.configure(configs, saslMechanism, jaasContext.configurationEntries());
login.configure(configs, jaasContext.name(), jaasContext.configuration(), loginCallbackHandler);
login.login();
}
/**
* Returns an instance of `LoginManager` and increases its reference count.
*
* `release()` should be invoked when the `LoginManager` is no longer needed. This method will try to reuse an
* existing `LoginManager` for the provided context type. If `jaasContext` was loaded from a dynamic config,
* login managers are reused for the same dynamic config value. For `jaasContext` loaded from static JAAS
* configuration, login managers are reused for static contexts with the same login context name.
*
* This is a bit ugly and it would be nicer if we could pass the `LoginManager` to `ChannelBuilders.create` and
* shut it down when the broker or clients are closed. It's straightforward to do the former, but it's more
* complicated to do the latter without making the consumer API more complex.
*
* @param jaasContext Static or dynamic JAAS context. `jaasContext.dynamicJaasConfig()` is non-null for dynamic context.
* For static contexts, this may contain multiple login modules if the context type is SERVER.
* For CLIENT static contexts and dynamic contexts of CLIENT and SERVER, 'jaasContext` contains
* only one login module.
* @param saslMechanism SASL mechanism for which login manager is being acquired. For dynamic contexts, the single
* login module in `jaasContext` corresponds to this SASL mechanism. Hence `Login` class is
* chosen based on this mechanism.
* @param defaultLoginClass Default login class to use if an override is not specified in `configs`
* @param configs Config options used to configure `Login` if a new login manager is created.
*
*/
public static LoginManager acquireLoginManager(JaasContext jaasContext, String saslMechanism,
Class defaultLoginClass,
Map configs) throws LoginException {
Class loginClass = configuredClassOrDefault(configs, jaasContext,
saslMechanism, SaslConfigs.SASL_LOGIN_CLASS, defaultLoginClass);
Class defaultLoginCallbackHandlerClass = OAuthBearerLoginModule.OAUTHBEARER_MECHANISM
.equals(saslMechanism) ? OAuthBearerUnsecuredLoginCallbackHandler.class
: AbstractLogin.DefaultLoginCallbackHandler.class;
Class loginCallbackClass = configuredClassOrDefault(configs, jaasContext,
saslMechanism, SaslConfigs.SASL_LOGIN_CALLBACK_HANDLER_CLASS, defaultLoginCallbackHandlerClass);
synchronized (LoginManager.class) {
LoginManager loginManager;
Password jaasConfigValue = jaasContext.dynamicJaasConfig();
if (jaasConfigValue != null) {
LoginMetadata loginMetadata = new LoginMetadata<>(jaasConfigValue, loginClass, loginCallbackClass);
loginManager = DYNAMIC_INSTANCES.get(loginMetadata);
if (loginManager == null) {
loginManager = new LoginManager(jaasContext, saslMechanism, configs, loginMetadata);
DYNAMIC_INSTANCES.put(loginMetadata, loginManager);
}
} else {
LoginMetadata loginMetadata = new LoginMetadata<>(jaasContext.name(), loginClass, loginCallbackClass);
loginManager = STATIC_INSTANCES.get(loginMetadata);
if (loginManager == null) {
loginManager = new LoginManager(jaasContext, saslMechanism, configs, loginMetadata);
STATIC_INSTANCES.put(loginMetadata, loginManager);
}
}
SecurityUtils.addConfiguredSecurityProviders(configs);
return loginManager.acquire();
}
}
public Subject subject() {
return login.subject();
}
public String serviceName() {
return login.serviceName();
}
// Only for testing
Object cacheKey() {
return loginMetadata.configInfo;
}
private LoginManager acquire() {
++refCount;
LOGGER.trace("{} acquired", this);
return this;
}
/**
* Decrease the reference count for this instance and release resources if it reaches 0.
*/
public void release() {
synchronized (LoginManager.class) {
if (refCount == 0)
throw new IllegalStateException("release() called on disposed " + this);
else if (refCount == 1) {
if (loginMetadata.configInfo instanceof Password) {
DYNAMIC_INSTANCES.remove(loginMetadata);
} else {
STATIC_INSTANCES.remove(loginMetadata);
}
login.close();
loginCallbackHandler.close();
}
--refCount;
LOGGER.trace("{} released", this);
}
}
@Override
public String toString() {
return "LoginManager(serviceName=" + serviceName() +
// subject.toString() exposes private credentials, so we can't use it
", publicCredentials=" + subject().getPublicCredentials() +
", refCount=" + refCount + ')';
}
/* Should only be used in tests. */
public static void closeAll() {
synchronized (LoginManager.class) {
for (LoginMetadata key : new ArrayList<>(STATIC_INSTANCES.keySet()))
STATIC_INSTANCES.remove(key).login.close();
for (LoginMetadata key : new ArrayList<>(DYNAMIC_INSTANCES.keySet()))
DYNAMIC_INSTANCES.remove(key).login.close();
}
}
private static Class configuredClassOrDefault(Map configs,
JaasContext jaasContext,
String saslMechanism,
String configName,
Class defaultClass) {
String prefix = jaasContext.type() == JaasContext.Type.SERVER ? ListenerName.saslMechanismPrefix(saslMechanism) : "";
@SuppressWarnings("unchecked")
Class clazz = (Class) configs.get(prefix + configName);
if (clazz != null && jaasContext.configurationEntries().size() != 1) {
String errorMessage = configName + " cannot be specified with multiple login modules in the JAAS context. " +
SaslConfigs.SASL_JAAS_CONFIG + " must be configured to override mechanism-specific configs.";
throw new ConfigException(errorMessage);
}
if (clazz == null)
clazz = defaultClass;
return clazz;
}
private static class LoginMetadata {
final T configInfo;
final Class loginClass;
final Class loginCallbackClass;
LoginMetadata(T configInfo, Class loginClass,
Class loginCallbackClass) {
this.configInfo = configInfo;
this.loginClass = loginClass;
this.loginCallbackClass = loginCallbackClass;
}
@Override
public int hashCode() {
return Objects.hash(configInfo, loginClass, loginCallbackClass);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
LoginMetadata loginMetadata = (LoginMetadata) o;
return Objects.equals(configInfo, loginMetadata.configInfo) &&
Objects.equals(loginClass, loginMetadata.loginClass) &&
Objects.equals(loginCallbackClass, loginMetadata.loginCallbackClass);
}
}
}
