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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.network;
import org.apache.kafka.common.Configurable;
import org.apache.kafka.common.config.AbstractConfig;
import org.apache.kafka.common.config.SslClientAuth;
import org.apache.kafka.common.config.internals.BrokerSecurityConfigs;
import org.apache.kafka.common.errors.InvalidConfigurationException;
import org.apache.kafka.common.requests.ApiVersionsResponse;
import org.apache.kafka.common.security.auth.SecurityProtocol;
import org.apache.kafka.common.security.JaasContext;
import org.apache.kafka.common.security.authenticator.DefaultKafkaPrincipalBuilder;
import org.apache.kafka.common.security.auth.KafkaPrincipalBuilder;
import org.apache.kafka.common.security.authenticator.CredentialCache;
import org.apache.kafka.common.security.kerberos.KerberosShortNamer;
import org.apache.kafka.common.security.ssl.SslPrincipalMapper;
import org.apache.kafka.common.security.token.delegation.internals.DelegationTokenCache;
import org.apache.kafka.common.utils.LogContext;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.common.utils.Utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.function.Supplier;
public class ChannelBuilders {
private static final Logger log = LoggerFactory.getLogger(ChannelBuilders.class);
private ChannelBuilders() { }
/**
* @param securityProtocol the securityProtocol
* @param contextType the contextType, it must be non-null if `securityProtocol` is SASL_*; it is ignored otherwise
* @param config client config
* @param listenerName the listenerName if contextType is SERVER or null otherwise
* @param clientSaslMechanism SASL mechanism if mode is CLIENT, ignored otherwise
* @param time the time instance
* @param saslHandshakeRequestEnable flag to enable Sasl handshake requests; disabled only for SASL
* inter-broker connections with inter-broker protocol version < 0.10
* @param logContext the log context instance
*
* @return the configured `ChannelBuilder`
* @throws IllegalArgumentException if `mode` invariants described above is not maintained
*/
public static ChannelBuilder clientChannelBuilder(
SecurityProtocol securityProtocol,
JaasContext.Type contextType,
AbstractConfig config,
ListenerName listenerName,
String clientSaslMechanism,
Time time,
boolean saslHandshakeRequestEnable,
LogContext logContext) {
if (securityProtocol == SecurityProtocol.SASL_PLAINTEXT || securityProtocol == SecurityProtocol.SASL_SSL) {
if (contextType == null)
throw new IllegalArgumentException("`contextType` must be non-null if `securityProtocol` is `" + securityProtocol + "`");
if (clientSaslMechanism == null)
throw new IllegalArgumentException("`clientSaslMechanism` must be non-null in client mode if `securityProtocol` is `" + securityProtocol + "`");
}
return create(securityProtocol, Mode.CLIENT, contextType, config, listenerName, false, clientSaslMechanism,
saslHandshakeRequestEnable, null, null, time, logContext, null);
}
/**
* @param listenerName the listenerName
* @param isInterBrokerListener whether or not this listener is used for inter-broker requests
* @param securityProtocol the securityProtocol
* @param config server config
* @param credentialCache Credential cache for SASL/SCRAM if SCRAM is enabled
* @param tokenCache Delegation token cache
* @param time the time instance
* @param logContext the log context instance
* @param apiVersionSupplier supplier for ApiVersions responses sent prior to authentication
*
* @return the configured `ChannelBuilder`
*/
public static ChannelBuilder serverChannelBuilder(ListenerName listenerName,
boolean isInterBrokerListener,
SecurityProtocol securityProtocol,
AbstractConfig config,
CredentialCache credentialCache,
DelegationTokenCache tokenCache,
Time time,
LogContext logContext,
Supplier apiVersionSupplier) {
return create(securityProtocol, Mode.SERVER, JaasContext.Type.SERVER, config, listenerName,
isInterBrokerListener, null, true, credentialCache,
tokenCache, time, logContext, apiVersionSupplier);
}
private static ChannelBuilder create(SecurityProtocol securityProtocol,
Mode mode,
JaasContext.Type contextType,
AbstractConfig config,
ListenerName listenerName,
boolean isInterBrokerListener,
String clientSaslMechanism,
boolean saslHandshakeRequestEnable,
CredentialCache credentialCache,
DelegationTokenCache tokenCache,
Time time,
LogContext logContext,
Supplier apiVersionSupplier) {
Map configs = channelBuilderConfigs(config, listenerName);
ChannelBuilder channelBuilder;
switch (securityProtocol) {
case SSL:
requireNonNullMode(mode, securityProtocol);
channelBuilder = new SslChannelBuilder(mode, listenerName, isInterBrokerListener, logContext);
break;
case SASL_SSL:
case SASL_PLAINTEXT:
requireNonNullMode(mode, securityProtocol);
Map jaasContexts;
String sslClientAuthOverride = null;
if (mode == Mode.SERVER) {
@SuppressWarnings("unchecked")
List enabledMechanisms = (List) configs.get(BrokerSecurityConfigs.SASL_ENABLED_MECHANISMS_CONFIG);
jaasContexts = new HashMap<>(enabledMechanisms.size());
for (String mechanism : enabledMechanisms)
jaasContexts.put(mechanism, JaasContext.loadServerContext(listenerName, mechanism, configs));
// SSL client authentication is enabled in brokers for SASL_SSL only if listener-prefixed config is specified.
if (listenerName != null && securityProtocol == SecurityProtocol.SASL_SSL) {
String configuredClientAuth = (String) configs.get(BrokerSecurityConfigs.SSL_CLIENT_AUTH_CONFIG);
String listenerClientAuth = (String) config.originalsWithPrefix(listenerName.configPrefix(), true)
.get(BrokerSecurityConfigs.SSL_CLIENT_AUTH_CONFIG);
// If `ssl.client.auth` is configured at the listener-level, we don't set an override and SslFactory
// uses the value from `configs`. If not, we propagate `sslClientAuthOverride=NONE` to SslFactory and
// it applies the override to the latest configs when it is configured or reconfigured. `Note that
// ssl.client.auth` cannot be dynamically altered.
if (listenerClientAuth == null) {
sslClientAuthOverride = SslClientAuth.NONE.name().toLowerCase(Locale.ROOT);
if (configuredClientAuth != null && !configuredClientAuth.equalsIgnoreCase(SslClientAuth.NONE.name())) {
log.warn("Broker configuration '{}' is applied only to SSL listeners. Listener-prefixed configuration can be used" +
" to enable SSL client authentication for SASL_SSL listeners. In future releases, broker-wide option without" +
" listener prefix may be applied to SASL_SSL listeners as well. All configuration options intended for specific" +
" listeners should be listener-prefixed.", BrokerSecurityConfigs.SSL_CLIENT_AUTH_CONFIG);
}
}
}
} else {
// Use server context for inter-broker client connections and client context for other clients
JaasContext jaasContext = contextType == JaasContext.Type.CLIENT ? JaasContext.loadClientContext(configs) :
JaasContext.loadServerContext(listenerName, clientSaslMechanism, configs);
jaasContexts = Collections.singletonMap(clientSaslMechanism, jaasContext);
}
channelBuilder = new SaslChannelBuilder(mode,
jaasContexts,
securityProtocol,
listenerName,
isInterBrokerListener,
clientSaslMechanism,
saslHandshakeRequestEnable,
credentialCache,
tokenCache,
sslClientAuthOverride,
time,
logContext,
apiVersionSupplier);
break;
case PLAINTEXT:
channelBuilder = new PlaintextChannelBuilder(listenerName);
break;
default:
throw new IllegalArgumentException("Unexpected securityProtocol " + securityProtocol);
}
channelBuilder.configure(configs);
return channelBuilder;
}
/**
* @return a mutable RecordingMap. The elements got from RecordingMap are marked as "used".
*/
@SuppressWarnings("unchecked")
static Map channelBuilderConfigs(final AbstractConfig config, final ListenerName listenerName) {
Map parsedConfigs;
if (listenerName == null)
parsedConfigs = (Map) config.values();
else
parsedConfigs = config.valuesWithPrefixOverride(listenerName.configPrefix());
config.originals().entrySet().stream()
.filter(e -> !parsedConfigs.containsKey(e.getKey())) // exclude already parsed configs
// exclude already parsed listener prefix configs
.filter(e -> !(listenerName != null && e.getKey().startsWith(listenerName.configPrefix()) &&
parsedConfigs.containsKey(e.getKey().substring(listenerName.configPrefix().length()))))
// exclude keys like `{mechanism}.some.prop` if "listener.name." prefix is present and key `some.prop` exists in parsed configs.
.filter(e -> !(listenerName != null && parsedConfigs.containsKey(e.getKey().substring(e.getKey().indexOf('.') + 1))))
.forEach(e -> parsedConfigs.put(e.getKey(), e.getValue()));
return parsedConfigs;
}
private static void requireNonNullMode(Mode mode, SecurityProtocol securityProtocol) {
if (mode == null)
throw new IllegalArgumentException("`mode` must be non-null if `securityProtocol` is `" + securityProtocol + "`");
}
public static KafkaPrincipalBuilder createPrincipalBuilder(Map configs,
KerberosShortNamer kerberosShortNamer,
SslPrincipalMapper sslPrincipalMapper) {
Class principalBuilderClass = (Class) configs.get(BrokerSecurityConfigs.PRINCIPAL_BUILDER_CLASS_CONFIG);
final KafkaPrincipalBuilder builder;
if (principalBuilderClass == null || principalBuilderClass == DefaultKafkaPrincipalBuilder.class) {
builder = new DefaultKafkaPrincipalBuilder(kerberosShortNamer, sslPrincipalMapper);
} else if (KafkaPrincipalBuilder.class.isAssignableFrom(principalBuilderClass)) {
builder = (KafkaPrincipalBuilder) Utils.newInstance(principalBuilderClass);
} else {
throw new InvalidConfigurationException("Type " + principalBuilderClass.getName() + " is not " +
"an instance of " + KafkaPrincipalBuilder.class.getName());
}
if (builder instanceof Configurable)
((Configurable) builder).configure(configs);
return builder;
}
}
