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Apache Jena Fuseki server Kafka connector
/*
* 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.oauthbearer;
import java.io.IOException;
import java.security.Key;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.auth.login.AppConfigurationEntry;
import org.apache.kafka.common.KafkaException;
import org.apache.kafka.common.security.auth.AuthenticateCallbackHandler;
import org.apache.kafka.common.security.oauthbearer.internals.secured.AccessTokenValidator;
import org.apache.kafka.common.security.oauthbearer.internals.secured.AccessTokenValidatorFactory;
import org.apache.kafka.common.security.oauthbearer.internals.secured.CloseableVerificationKeyResolver;
import org.apache.kafka.common.security.oauthbearer.internals.secured.JaasOptionsUtils;
import org.apache.kafka.common.security.oauthbearer.internals.secured.RefreshingHttpsJwksVerificationKeyResolver;
import org.apache.kafka.common.security.oauthbearer.internals.secured.ValidateException;
import org.apache.kafka.common.security.oauthbearer.internals.secured.VerificationKeyResolverFactory;
import org.jose4j.jws.JsonWebSignature;
import org.jose4j.jwx.JsonWebStructure;
import org.jose4j.lang.UnresolvableKeyException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
* OAuthBearerValidatorCallbackHandler is an {@link AuthenticateCallbackHandler} that
* accepts {@link OAuthBearerValidatorCallback} and {@link OAuthBearerExtensionsValidatorCallback}
* callbacks to implement OAuth/OIDC validation. This callback handler is intended only to be used
* on the Kafka broker side as it will receive a {@link OAuthBearerValidatorCallback} that includes
* the JWT provided by the Kafka client. That JWT is validated in terms of format, expiration,
* signature, and audience and issuer (if desired). This callback handler is the broker side of the
* OAuth functionality, whereas {@link OAuthBearerLoginCallbackHandler} is used by clients.
*
*
*
* This {@link AuthenticateCallbackHandler} is enabled in the broker configuration by setting the
* {@link org.apache.kafka.common.config.internals.BrokerSecurityConfigs#SASL_SERVER_CALLBACK_HANDLER_CLASS_CONFIG}
* like so:
*
*
* listener.name..oauthbearer.sasl.server.callback.handler.class=org.apache.kafka.common.security.oauthbearer.OAuthBearerValidatorCallbackHandler
*
*
*
*
* The JAAS configuration for OAuth is also needed. If using OAuth for inter-broker communication,
* the options are those specified in {@link OAuthBearerLoginCallbackHandler}.
*
*
*
* The configuration option
* {@link org.apache.kafka.common.config.SaslConfigs#SASL_OAUTHBEARER_JWKS_ENDPOINT_URL}
* is also required in order to contact the OAuth/OIDC provider to retrieve the JWKS for use in
* JWT signature validation. For example:
*
*
* listener.name..oauthbearer.sasl.oauthbearer.jwks.endpoint.url=https://example.com/oauth2/v1/keys
*
*
* Please see the OAuth/OIDC providers documentation for the JWKS endpoint URL.
*
*
*
* The following is a list of all the configuration options that are available for the broker
* validation callback handler:
*
*
* - {@link org.apache.kafka.common.config.internals.BrokerSecurityConfigs#SASL_SERVER_CALLBACK_HANDLER_CLASS_CONFIG}
* - {@link org.apache.kafka.common.config.SaslConfigs#SASL_JAAS_CONFIG}
* - {@link org.apache.kafka.common.config.SaslConfigs#SASL_OAUTHBEARER_CLOCK_SKEW_SECONDS}
* - {@link org.apache.kafka.common.config.SaslConfigs#SASL_OAUTHBEARER_EXPECTED_AUDIENCE}
* - {@link org.apache.kafka.common.config.SaslConfigs#SASL_OAUTHBEARER_EXPECTED_ISSUER}
* - {@link org.apache.kafka.common.config.SaslConfigs#SASL_OAUTHBEARER_JWKS_ENDPOINT_REFRESH_MS}
* - {@link org.apache.kafka.common.config.SaslConfigs#SASL_OAUTHBEARER_JWKS_ENDPOINT_RETRY_BACKOFF_MAX_MS}
* - {@link org.apache.kafka.common.config.SaslConfigs#SASL_OAUTHBEARER_JWKS_ENDPOINT_RETRY_BACKOFF_MS}
* - {@link org.apache.kafka.common.config.SaslConfigs#SASL_OAUTHBEARER_JWKS_ENDPOINT_URL}
* - {@link org.apache.kafka.common.config.SaslConfigs#SASL_OAUTHBEARER_SCOPE_CLAIM_NAME}
* - {@link org.apache.kafka.common.config.SaslConfigs#SASL_OAUTHBEARER_SUB_CLAIM_NAME}
*
*
*/
public class OAuthBearerValidatorCallbackHandler implements AuthenticateCallbackHandler {
private static final Logger log = LoggerFactory.getLogger(OAuthBearerValidatorCallbackHandler.class);
/**
* Because a {@link CloseableVerificationKeyResolver} instance can spawn threads and issue
* HTTP(S) calls ({@link RefreshingHttpsJwksVerificationKeyResolver}), we only want to create
* a new instance for each particular set of configuration. Because each set of configuration
* may have multiple instances, we want to reuse the single instance.
*/
private static final Map VERIFICATION_KEY_RESOLVER_CACHE = new HashMap<>();
private CloseableVerificationKeyResolver verificationKeyResolver;
private AccessTokenValidator accessTokenValidator;
private boolean isInitialized = false;
@Override
public void configure(Map configs, String saslMechanism, List jaasConfigEntries) {
Map moduleOptions = JaasOptionsUtils.getOptions(saslMechanism, jaasConfigEntries);
CloseableVerificationKeyResolver verificationKeyResolver;
// Here's the logic which keeps our VerificationKeyResolvers down to a single instance.
synchronized (VERIFICATION_KEY_RESOLVER_CACHE) {
VerificationKeyResolverKey key = new VerificationKeyResolverKey(configs, moduleOptions);
verificationKeyResolver = VERIFICATION_KEY_RESOLVER_CACHE.computeIfAbsent(key, k ->
new RefCountingVerificationKeyResolver(VerificationKeyResolverFactory.create(configs, saslMechanism, moduleOptions)));
}
AccessTokenValidator accessTokenValidator = AccessTokenValidatorFactory.create(configs, saslMechanism, verificationKeyResolver);
init(verificationKeyResolver, accessTokenValidator);
}
public void init(CloseableVerificationKeyResolver verificationKeyResolver, AccessTokenValidator accessTokenValidator) {
this.verificationKeyResolver = verificationKeyResolver;
this.accessTokenValidator = accessTokenValidator;
try {
verificationKeyResolver.init();
} catch (Exception e) {
throw new KafkaException("The OAuth validator configuration encountered an error when initializing the VerificationKeyResolver", e);
}
isInitialized = true;
}
@Override
public void close() {
if (verificationKeyResolver != null) {
try {
verificationKeyResolver.close();
} catch (Exception e) {
log.error(e.getMessage(), e);
}
}
}
@Override
public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
checkInitialized();
for (Callback callback : callbacks) {
if (callback instanceof OAuthBearerValidatorCallback) {
handleValidatorCallback((OAuthBearerValidatorCallback) callback);
} else if (callback instanceof OAuthBearerExtensionsValidatorCallback) {
handleExtensionsValidatorCallback((OAuthBearerExtensionsValidatorCallback) callback);
} else {
throw new UnsupportedCallbackException(callback);
}
}
}
private void handleValidatorCallback(OAuthBearerValidatorCallback callback) {
checkInitialized();
OAuthBearerToken token;
try {
token = accessTokenValidator.validate(callback.tokenValue());
callback.token(token);
} catch (ValidateException e) {
log.warn(e.getMessage(), e);
callback.error("invalid_token", null, null);
}
}
private void handleExtensionsValidatorCallback(OAuthBearerExtensionsValidatorCallback extensionsValidatorCallback) {
checkInitialized();
extensionsValidatorCallback.inputExtensions().map().forEach((extensionName, v) -> extensionsValidatorCallback.valid(extensionName));
}
private void checkInitialized() {
if (!isInitialized)
throw new IllegalStateException(String.format("To use %s, first call the configure or init method", getClass().getSimpleName()));
}
/**
* VkrKey is a simple structure which encapsulates the criteria for different
* sets of configuration. This will allow us to use this object as a key in a {@link Map}
* to keep a single instance per key.
*/
private static class VerificationKeyResolverKey {
private final Map configs;
private final Map moduleOptions;
public VerificationKeyResolverKey(Map configs, Map moduleOptions) {
this.configs = configs;
this.moduleOptions = moduleOptions;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
VerificationKeyResolverKey that = (VerificationKeyResolverKey) o;
return configs.equals(that.configs) && moduleOptions.equals(that.moduleOptions);
}
@Override
public int hashCode() {
return Objects.hash(configs, moduleOptions);
}
}
/**
* RefCountingVerificationKeyResolver allows us to share a single
* {@link CloseableVerificationKeyResolver} instance between multiple
* {@link AuthenticateCallbackHandler} instances and perform the lifecycle methods the
* appropriate number of times.
*/
private static class RefCountingVerificationKeyResolver implements CloseableVerificationKeyResolver {
private final CloseableVerificationKeyResolver delegate;
private final AtomicInteger count = new AtomicInteger(0);
public RefCountingVerificationKeyResolver(CloseableVerificationKeyResolver delegate) {
this.delegate = delegate;
}
@Override
public Key resolveKey(JsonWebSignature jws, List nestingContext) throws UnresolvableKeyException {
return delegate.resolveKey(jws, nestingContext);
}
@Override
public void init() throws IOException {
if (count.incrementAndGet() == 1)
delegate.init();
}
@Override
public void close() throws IOException {
if (count.decrementAndGet() == 0)
delegate.close();
}
}
}