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At Viasat, Kafka is a backbone for a multi-tenant streaming platform that transports data for 1000 streams and used by more than 60 teams in a production environment. Role-based access control to the sensitive data is an essential requirement for our customers who must comply with a variety of regulations including GDPR. Kafka ships with a pluggable Authorizer that can control access to resources like cluster, topic or consumer group. However, maintaining ACLs in the large multi-tenant deployment can be support-intensive. At Viasat, we developed a custom Kafka Authorizer and Role Manager application that integrates our Kafka cluster with Viasat’s internal LDAP services. The presentation will cover how we designed and built Kafka LDAP Authorizer, which allows us to control resources within the cluster as well as services built around Kafka. We apply our permissions model to our data forwarders, ETL jobs, and stream processing. We will also share how we achieved a stress free migration to secure infrastructure without interruption to the production data flow. Our secure deployment model accomplishes multiple goals: – Integration into an LDAP central authentication system. – Use of the same authorization service to control permissions to data in Kafka as well as services built around Kafka. – Delegation of permissions control to the security officers on the teams using the service. – Detailed audit and breach notifications based on the metrics produced by the custom authorizer. We plan to open source our custom Kafka Authorizer.