Archive for June, 2021

Describing Kafka security in AsyncAPI

Tuesday, June 29th, 2021

The new version of AsyncAPI, 2.1.0, was released today. One of the updates is that it lets you describe Kafka security mechanisms and protocols. In this post, I’ll show how you can do this, and how it relates to configuring a Kafka client.

Kafka config means AsyncAPI
sasl.mechanism security.protocol encryption? auth? server protocol security scheme type
unset PLAINTEXT no no kafka
PLAIN SASL_PLAINTEXT no yes, using SASL/PLAIN kafka plain
SCRAM-SHA-256 SASL_PLAINTEXT no yes, using SASL/SCRAM kafka scramSha256
SCRAM-SHA-512 SASL_PLAINTEXT no yes, using SASL/SCRAM kafka scramSha512
OAUTHBEARER SASL_PLAINTEXT no yes, using OAuth kafka oauth2
GSSAPI SASL_PLAINTEXT no yes, using GSSAPI kafka gssapi
unset SSL yes no kafka-secure
PLAIN SASL_SSL yes yes, using SASL/PLAIN kafka-secure plain
SCRAM-SHA-256 SASL_SSL yes yes, using SASL/SCRAM kafka-secure scramSha256
SCRAM-SHA-512 SASL_SSL yes yes, using SASL/SCRAM kafka-secure scramSha512
OAUTHBEARER SASL_SSL yes yes, using OAuth kafka-secure oauth2
GSSAPI SASL_SSL yes yes, using GSSAPI kafka-secure gssapi
unset SSL yes yes, using mutual TLS kafka-secure X509

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How to avoid SSL handshake errors in your Kafka client because of a self-signed cluster CA

Sunday, June 27th, 2021

You’re trying to connect a Kafka client to a development Apache Kafka cluster which has been quickly set up using a self-signed CA certificate. You don’t have a copy of that CA certificate, and (because it’s not signed by a well-known CA) your Kafka client is failing because of SSL handshake errors.

The error contains messages like
org.apache.kafka.common.errors.SslAuthenticationException: SSL handshake failed
and
javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target.

For example:

$ ./bin/kafka-console-consumer.sh \
 --bootstrap-server dale-kafka-saslscram-bootstrap-strimzi.apps.eem-test-fest-6.cp.fyre.ibm.com:443 \
 --topic DALE.TOPIC \
 --group dalegrp \
 --consumer-property 'security.protocol=SASL_SSL' \
 --consumer-property 'sasl.mechanism=SCRAM-SHA-512' \
 --consumer-property 'sasl.jaas.config=org.apache.kafka.common.security.scram.ScramLoginModule required username="dale-user" password="pSRtfwTMKNlz";'

[2021-06-27 23:19:06,048] ERROR [Consumer clientId=consumer-dalegrp-1, groupId=dalegrp] Connection to node -1 (dale-kafka-saslscram-bootstrap-strimzi.apps.eem-test-fest-6.cp.fyre.ibm.com/9.46.199.58:443) failed authentication due to: SSL handshake failed (org.apache.kafka.clients.NetworkClient)
[2021-06-27 23:19:06,049] WARN [Consumer clientId=consumer-dalegrp-1, groupId=dalegrp] Bootstrap broker dale-kafka-saslscram-bootstrap-strimzi.apps.eem-test-fest-6.cp.fyre.ibm.com:443 (id: -1 rack: null) disconnected (org.apache.kafka.clients.NetworkClient)
[2021-06-27 23:19:06,069] ERROR Error processing message, terminating consumer process:  (kafka.tools.ConsoleConsumer$)
org.apache.kafka.common.errors.SslAuthenticationException: SSL handshake failed
Caused by: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:131)
	at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:326)
	at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:269)
	at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:264)
	at java.base/sun.security.ssl.CertificateMessage$T13CertificateConsumer.checkServerCerts(CertificateMessage.java:1339)
	at java.base/sun.security.ssl.CertificateMessage$T13CertificateConsumer.onConsumeCertificate(CertificateMessage.java:1214)
	at java.base/sun.security.ssl.CertificateMessage$T13CertificateConsumer.consume(CertificateMessage.java:1157)
	at java.base/sun.security.ssl.SSLHandshake.consume(SSLHandshake.java:392)
	at java.base/sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:444)
	at java.base/sun.security.ssl.SSLEngineImpl$DelegatedTask$DelegatedAction.run(SSLEngineImpl.java:1074)
	at java.base/sun.security.ssl.SSLEngineImpl$DelegatedTask$DelegatedAction.run(SSLEngineImpl.java:1061)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:770)
	at java.base/sun.security.ssl.SSLEngineImpl$DelegatedTask.run(SSLEngineImpl.java:1008)
	at org.apache.kafka.common.network.SslTransportLayer.runDelegatedTasks(SslTransportLayer.java:430)
	at org.apache.kafka.common.network.SslTransportLayer.handshakeUnwrap(SslTransportLayer.java:514)
	at org.apache.kafka.common.network.SslTransportLayer.doHandshake(SslTransportLayer.java:368)
	at org.apache.kafka.common.network.SslTransportLayer.handshake(SslTransportLayer.java:291)
	at org.apache.kafka.common.network.KafkaChannel.prepare(KafkaChannel.java:173)
	at org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:543)
	at org.apache.kafka.common.network.Selector.poll(Selector.java:481)
	at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:561)
	at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:265)
	at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:236)
	at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:215)
	at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureCoordinatorReady(AbstractCoordinator.java:244)
	at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:480)
	at org.apache.kafka.clients.consumer.KafkaConsumer.updateAssignmentMetadataIfNeeded(KafkaConsumer.java:1257)
	at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1226)
	at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1206)
	at kafka.tools.ConsoleConsumer$ConsumerWrapper.receive(ConsoleConsumer.scala:444)
	at kafka.tools.ConsoleConsumer$.process(ConsoleConsumer.scala:103)
	at kafka.tools.ConsoleConsumer$.run(ConsoleConsumer.scala:77)
	at kafka.tools.ConsoleConsumer$.main(ConsoleConsumer.scala:54)
	at kafka.tools.ConsoleConsumer.main(ConsoleConsumer.scala)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at java.base/sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:439)
	at java.base/sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:306)
	at java.base/sun.security.validator.Validator.validate(Validator.java:264)
	at java.base/sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:313)
	at java.base/sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:276)
	at java.base/sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:141)
	at java.base/sun.security.ssl.CertificateMessage$T13CertificateConsumer.checkServerCerts(CertificateMessage.java:1317)
	... 29 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at java.base/sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)
	at java.base/sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)
	at java.base/java.security.cert.CertPathBuilder.build(CertPathBuilder.java:297)
	at java.base/sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:434)
	... 35 more
Processed a total of 0 messages

I’m assuming that this is just for development purposes, that you know it’s safe to trust the certificate that the Kafka cluster is presenting, and that you’d rather just workaround the error than ask the owner of the Kafka cluster for a copy of their CA.

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Event Endpoint Management

Sunday, June 27th, 2021

Last week, we released the latest version of Event Endpoint Management in IBM Cloud Pak for Integration 2021.2.1. It allows organisations to share and manage access to their Kafka topics. In this post, I want to share a run-through of how it all works.

I’ll start with a high level summary overview, then a walkthrough demo video, and finally share some links to related reading if you’d like more detail.

Overview


click for a larger version of the diagram – numbers in the diagram are described below

Kafka topic owner

This is someone who has a Kafka topic, and is running an application or system that is producing a stream of events to that topic.

They think this stream of events might be useful to other developers in their organisation, so they describe it (using AsyncAPI) and publish this to a catalog where it can be discovered and managed.

  1. creates a Kafka topic and an application that produces events to it
  2. describes and documents their Kafka topic, and the events that are being produced to it
  3. publishes the description of their Kafka topic
  4. pushes the Kafka cluster security info to the Event Gateway service so it can manage access to the topic for the topic owner

App developer

This is someone who is building an application that could benefit from a stream of events.

They are able to discover the event sources that have been shared in their organisation, and get access to them through a self-service Developer Portal.

  1. creates credentials for use in their application
  2. registers new application credentials
  3. updates the Event Gateway service with the new application credentials
  4. creates or configures an application with guidance from the Portal
  5. application connects to the Event Gateway service
  6. application connection routed securely to the Kafka brokers

(more…)

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