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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 javax.security.auth.x500.X500Principal;
import org.apache.kafka.common.KafkaException;
import org.apache.kafka.common.config.SaslConfigs;
import org.apache.kafka.common.network.Authenticator;
import org.apache.kafka.common.network.TransportLayer;
import org.apache.kafka.common.security.auth.AuthenticationContext;
import org.apache.kafka.common.security.auth.KafkaPrincipal;
import org.apache.kafka.common.security.auth.KafkaPrincipalBuilder;
import org.apache.kafka.common.security.auth.PlaintextAuthenticationContext;
import org.apache.kafka.common.security.auth.SaslAuthenticationContext;
import org.apache.kafka.common.security.auth.SslAuthenticationContext;
import org.apache.kafka.common.security.kerberos.KerberosName;
import org.apache.kafka.common.security.kerberos.KerberosShortNamer;
import javax.net.ssl.SSLPeerUnverifiedException;
import javax.net.ssl.SSLSession;
import javax.security.sasl.SaslServer;
import org.apache.kafka.common.security.ssl.SslPrincipalMapper;
import java.io.Closeable;
import java.io.IOException;
import java.security.Principal;
import static java.util.Objects.requireNonNull;
/**
* Default implementation of {@link KafkaPrincipalBuilder} which provides basic support for
* SSL authentication and SASL authentication. In the latter case, when GSSAPI is used, this
* class applies {@link org.apache.kafka.common.security.kerberos.KerberosShortNamer} to transform
* the name.
*
* NOTE: This is an internal class and can change without notice. Unlike normal implementations
* of {@link KafkaPrincipalBuilder}, there is no default no-arg constructor since this class
* must adapt implementations of the older {@link org.apache.kafka.common.security.auth.PrincipalBuilder} interface.
*/
public class DefaultKafkaPrincipalBuilder implements KafkaPrincipalBuilder, Closeable {
// Use FQN to avoid import deprecation warnings
@SuppressWarnings("deprecation")
private final org.apache.kafka.common.security.auth.PrincipalBuilder oldPrincipalBuilder;
private final Authenticator authenticator;
private final TransportLayer transportLayer;
private final KerberosShortNamer kerberosShortNamer;
private final SslPrincipalMapper sslPrincipalMapper;
/**
* Construct a new instance which wraps an instance of the older {@link org.apache.kafka.common.security.auth.PrincipalBuilder}.
*
* @param authenticator The authenticator in use
* @param transportLayer The underlying transport layer
* @param oldPrincipalBuilder Instance of {@link org.apache.kafka.common.security.auth.PrincipalBuilder}
* @param kerberosShortNamer Kerberos name rewrite rules or null if none have been configured
*/
@SuppressWarnings("deprecation")
public static DefaultKafkaPrincipalBuilder fromOldPrincipalBuilder(Authenticator authenticator,
TransportLayer transportLayer,
org.apache.kafka.common.security.auth.PrincipalBuilder oldPrincipalBuilder,
KerberosShortNamer kerberosShortNamer) {
return new DefaultKafkaPrincipalBuilder(
requireNonNull(authenticator),
requireNonNull(transportLayer),
requireNonNull(oldPrincipalBuilder),
kerberosShortNamer,
null);
}
@SuppressWarnings("deprecation")
private DefaultKafkaPrincipalBuilder(Authenticator authenticator,
TransportLayer transportLayer,
org.apache.kafka.common.security.auth.PrincipalBuilder oldPrincipalBuilder,
KerberosShortNamer kerberosShortNamer,
SslPrincipalMapper sslPrincipalMapper) {
this.authenticator = authenticator;
this.transportLayer = transportLayer;
this.oldPrincipalBuilder = oldPrincipalBuilder;
this.kerberosShortNamer = kerberosShortNamer;
this.sslPrincipalMapper = sslPrincipalMapper;
}
/**
* Construct a new instance.
*
* @param kerberosShortNamer Kerberos name rewrite rules or null if none have been configured
* @param sslPrincipalMapper SSL Principal mapper or null if none have been configured
*/
public DefaultKafkaPrincipalBuilder(KerberosShortNamer kerberosShortNamer, SslPrincipalMapper sslPrincipalMapper) {
this(null, null, null, kerberosShortNamer, sslPrincipalMapper);
}
@Override
public KafkaPrincipal build(AuthenticationContext context) {
if (context instanceof PlaintextAuthenticationContext) {
if (oldPrincipalBuilder != null)
return convertToKafkaPrincipal(oldPrincipalBuilder.buildPrincipal(transportLayer, authenticator));
return KafkaPrincipal.ANONYMOUS;
} else if (context instanceof SslAuthenticationContext) {
SSLSession sslSession = ((SslAuthenticationContext) context).session();
if (oldPrincipalBuilder != null)
return convertToKafkaPrincipal(oldPrincipalBuilder.buildPrincipal(transportLayer, authenticator));
try {
return applySslPrincipalMapper(sslSession.getPeerPrincipal());
} catch (SSLPeerUnverifiedException se) {
return KafkaPrincipal.ANONYMOUS;
}
} else if (context instanceof SaslAuthenticationContext) {
SaslServer saslServer = ((SaslAuthenticationContext) context).server();
if (SaslConfigs.GSSAPI_MECHANISM.equals(saslServer.getMechanismName()))
return applyKerberosShortNamer(saslServer.getAuthorizationID());
else
return new KafkaPrincipal(KafkaPrincipal.USER_TYPE, saslServer.getAuthorizationID());
} else {
throw new IllegalArgumentException("Unhandled authentication context type: " + context.getClass().getName());
}
}
private KafkaPrincipal applyKerberosShortNamer(String authorizationId) {
KerberosName kerberosName = KerberosName.parse(authorizationId);
try {
String shortName = kerberosShortNamer.shortName(kerberosName);
return new KafkaPrincipal(KafkaPrincipal.USER_TYPE, shortName);
} catch (IOException e) {
throw new KafkaException("Failed to set name for '" + kerberosName +
"' based on Kerberos authentication rules.", e);
}
}
private KafkaPrincipal applySslPrincipalMapper(Principal principal) {
try {
if (!(principal instanceof X500Principal) || principal == KafkaPrincipal.ANONYMOUS) {
return new KafkaPrincipal(KafkaPrincipal.USER_TYPE, principal.getName());
} else {
return new KafkaPrincipal(KafkaPrincipal.USER_TYPE, sslPrincipalMapper.getName(principal.getName()));
}
} catch (IOException e) {
throw new KafkaException("Failed to map name for '" + principal.getName() +
"' based on SSL principal mapping rules.", e);
}
}
private KafkaPrincipal convertToKafkaPrincipal(Principal principal) {
return new KafkaPrincipal(KafkaPrincipal.USER_TYPE, principal.getName());
}
@Override
public void close() {
if (oldPrincipalBuilder != null)
oldPrincipalBuilder.close();
}
}
