Barbican

Barbican is an OpenStack (infrastructure security) service that provides secure storage, provisioning, and lifecycle management of secrets such as encryption keys, X.509 certificates, and passwords for cloud workloads.

• Secret management for encryption keys, certificates, passwords, and arbitrary data (infrastructure security).
• Representational State Transfer (REST) Application Programming Interface (API) for storing, retrieving, and managing secrets and containers (API-based key management).
• Integration with hardware and software cryptographic backends through plugins, including HSMs (pluggable crypto backends).
• Management of certificates and certificate authorities, including issuance and rotation workflows (certificate lifecycle management).
• Designed to integrate with other OpenStack services for at-rest and in-transit data protection (cloud platform integration).

More About Barbican

Barbican is the OpenStack service for secure management of sensitive data such as encryption keys, certificates, passwords, and other secret material (infrastructure security). It addresses the problem of how cloud services and tenant applications store and access cryptographic material in a centralized, auditable, and programmable way, rather than embedding secrets directly in configuration files or code.

At its core, Barbican exposes a RESTful API (API-based key management) that allows clients to create, store, retrieve, update, and delete secrets. These secrets can include symmetric keys, asymmetric key pairs, certificates, and opaque data. Barbican can store secrets in its own backend or delegate cryptographic operations and storage to external systems through a pluggable architecture. This interface allows cloud operators to align secret storage with their chosen cryptographic infrastructure.

Barbican uses a plugin model for secret stores and crypto backends (pluggable crypto backends). Deployments can integrate with hardware security modules, dedicated key management systems, or software-based cryptography. This gives operators options around key protection, key isolation, and compliance with organizational policies. The plugin system also applies to certificate authority backends, enabling Barbican to connect to external Content Addressable Storage (CAS) for certificate issuance and management.

Certificate management is a central function of Barbican (certificate lifecycle management). The service can handle certificate orders, issuance, storage, retrieval, and renewal workflows. It supports containers that logically group related secrets, such as a private key, public key, and certificate chain, which simplifies how applications obtain and use complete credential sets. This is relevant for Transport Layer Security (TLS) termination, service-to-service mutual TLS, and other PKI-based use cases within OpenStack clouds.

In enterprise and institutional environments, Barbican is typically deployed as part of an OpenStack cloud (cloud infrastructure platform). Other OpenStack services can rely on Barbican for key storage used in volume encryption, object storage encryption, or service credentials. Tenants and application teams can also use the Barbican API directly to manage application secrets in a multi-tenant cloud context. Role-Based Access Control (RBAC) and project scoping are used to partition secrets according to OpenStack projects.

From an architectural perspective, Barbican operates as a multi-tenant web service with an API layer, task processing components, and pluggable backends for storage and cryptography (infrastructure security). It leverages common OpenStack patterns for authentication and authorization, typically integrating with the OpenStack identity service for token-based access control. This alignment with the broader OpenStack ecosystem allows Barbican to function as the central secret and certificate service within an OpenStack deployment, filling the directory role of key management service and certificate management system for cloud-native workloads.