kafka SaslClientCallbackHandler 源码
kafka SaslClientCallbackHandler 代码
文件路径:/clients/src/main/java/org/apache/kafka/common/security/authenticator/SaslClientCallbackHandler.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.kafka.common.security.authenticator;
import java.security.AccessController;
import java.util.List;
import java.util.Map;
import javax.security.auth.Subject;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.auth.login.AppConfigurationEntry;
import javax.security.sasl.AuthorizeCallback;
import javax.security.sasl.RealmCallback;
import org.apache.kafka.common.config.SaslConfigs;
import org.apache.kafka.common.security.auth.SaslExtensionsCallback;
import org.apache.kafka.common.security.auth.AuthenticateCallbackHandler;
import org.apache.kafka.common.security.auth.SaslExtensions;
import org.apache.kafka.common.security.scram.ScramExtensionsCallback;
import org.apache.kafka.common.security.scram.internals.ScramMechanism;
/**
* Default callback handler for Sasl clients. The callbacks required for the SASL mechanism
* configured for the client should be supported by this callback handler. See
* <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/security/sasl/sasl-refguide.html">Java SASL API</a>
* for the list of SASL callback handlers required for each SASL mechanism.
*
* For adding custom SASL extensions, a {@link SaslExtensions} may be added to the subject's public credentials
*/
public class SaslClientCallbackHandler implements AuthenticateCallbackHandler {
private String mechanism;
@Override
public void configure(Map<String, ?> configs, String saslMechanism, List<AppConfigurationEntry> jaasConfigEntries) {
this.mechanism = saslMechanism;
}
@Override
public void handle(Callback[] callbacks) throws UnsupportedCallbackException {
Subject subject = Subject.getSubject(AccessController.getContext());
for (Callback callback : callbacks) {
if (callback instanceof NameCallback) {
NameCallback nc = (NameCallback) callback;
if (subject != null && !subject.getPublicCredentials(String.class).isEmpty()) {
nc.setName(subject.getPublicCredentials(String.class).iterator().next());
} else
nc.setName(nc.getDefaultName());
} else if (callback instanceof PasswordCallback) {
if (subject != null && !subject.getPrivateCredentials(String.class).isEmpty()) {
char[] password = subject.getPrivateCredentials(String.class).iterator().next().toCharArray();
((PasswordCallback) callback).setPassword(password);
} else {
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 if (callback instanceof AuthorizeCallback) {
AuthorizeCallback ac = (AuthorizeCallback) callback;
String authId = ac.getAuthenticationID();
String authzId = ac.getAuthorizationID();
ac.setAuthorized(authId.equals(authzId));
if (ac.isAuthorized())
ac.setAuthorizedID(authzId);
} else if (callback instanceof ScramExtensionsCallback) {
if (ScramMechanism.isScram(mechanism) && subject != null && !subject.getPublicCredentials(Map.class).isEmpty()) {
@SuppressWarnings("unchecked")
Map<String, String> extensions = (Map<String, String>) subject.getPublicCredentials(Map.class).iterator().next();
((ScramExtensionsCallback) callback).extensions(extensions);
}
} else if (callback instanceof SaslExtensionsCallback) {
if (!SaslConfigs.GSSAPI_MECHANISM.equals(mechanism) &&
subject != null && !subject.getPublicCredentials(SaslExtensions.class).isEmpty()) {
SaslExtensions extensions = subject.getPublicCredentials(SaslExtensions.class).iterator().next();
((SaslExtensionsCallback) callback).extensions(extensions);
}
} else {
throw new UnsupportedCallbackException(callback, "Unrecognized SASL ClientCallback");
}
}
}
@Override
public void close() {
}
}
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