The Tool Desk
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What does OpenBao do?
OpenBao is accessed through a web UI, command-line interface, or HTTP API. It validates clients before allowing access to secrets or other sensitive data, such as API tokens, encryption keys, passwords, and certificates. The project’s official overview describes it as a way to centralize this management while controlling access through identity and policy.
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Rather than acting like a shared folder of credentials, OpenBao mediates requests: a client authenticates, receives a token associated with policy, and can use that token only for permitted resources and operations.
How does OpenBao control access?
- Authenticate: A client supplies information to an authentication method, which checks it against a trusted source.
- Issue a token: After validation, OpenBao returns a token associated with policy.
- Authorize: OpenBao checks the policy to determine which paths and actions the token allows.
- Grant permitted access: The client can access only the resources and operations allowed by that policy.
Policies are path-based, so operators can scope permissions to particular data and actions instead of giving every client broad access. The official policy documentation explains how policies constrain paths and operations.
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What kinds of secrets can it manage?
Stored secrets
OpenBao can store arbitrary key/value data, including credentials and keys. It encrypts that data before writing it to persistent storage.
Dynamic credentials
Some secrets engines can generate credentials on demand for supported systems, including Kubernetes and SQL databases. These credentials can have leases and may be revoked when the lease expires. Availability depends on the engine and target system; this does not mean every integration or credential type is supported.
Encryption services
OpenBao can provide encryption and decryption services without storing the data being encrypted. An application can therefore keep its data elsewhere while using OpenBao for cryptographic operations.
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Leases, renewal, and revocation
Secrets can be issued with leases. Clients may renew leases through built-in APIs, and OpenBao supports revoking an individual secret or a group of related secrets. The exact lifecycle depends on the secrets engine and the system that issued or consumes the credential.
How does OpenBao protect stored data and connections?
OpenBao’s security model describes a barrier that encrypts data before it leaves OpenBao for persistent storage. It specifies AES-256-GCM with 96-bit nonces; authentication tags are checked when data is decrypted. The design also calls for TLS on client-server connections to verify the server and protect the channel, and mutually authenticated TLS for traffic between cluster nodes.
These are documented design properties, not a guarantee that any deployment is secure regardless of configuration. The threat model excludes arbitrary control of the storage backend. Even if an attacker who can read that backend cannot see secret contents in plaintext, they may still observe that secret material exists and is stored.
What do sealed and unsealed mean?
An OpenBao server starts sealed, and normal operations require it to be unsealed. The architecture documentation describes Shamir’s Secret Sharing as the default approach: unseal key material is divided into shares, and a configured threshold is needed to reconstruct it. It also describes auto-unseal using a trusted cloud key management service or hardware security module (HSM). See the seal and unseal documentation for the architecture details.
These approaches involve different operational responsibilities. Shamir shares must be protected and brought together for unsealing; auto-unseal relies on the chosen trusted service and its access and recovery processes. The architecture description does not establish compatibility or suitability for a particular HSM product, so check documentation for the OpenBao version and integration you plan to use.
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How does auditing work?
Requests and responses pass through configured audit devices. The security model says that, when audit logging is enabled, requests and responses must be logged before the client receives secret material. That behavior depends on audit devices being configured and logging being enabled; it should not be treated as an automatic, complete audit trail in every deployment.
Operators should decide which audit devices to use and how logs will be retained, protected, and monitored. OpenBao’s audit documentation describes audit devices and their role.
What should you evaluate before using OpenBao?
- Identity and policy: Confirm that the available authentication methods fit your users and workloads, and scope policies narrowly to the required paths and operations.
- Unseal and recovery: Choose between Shamir shares and a trusted KMS or HSM approach based on who controls key material and how recovery will work.
- Credential lifecycle: Verify that the needed secrets engine supports the target system, then define how leases are renewed and how revocation behaves.
- Audit operations: Configure audit devices and establish how logs are retained and reviewed.
- Threat assumptions: Treat storage encryption as one protection, not a defense against every form of deployment compromise; arbitrary control of the storage backend is outside the published threat model.
Documentation note: the official overview, security model, and glossary are labeled Version 2.7.x, while the architecture information cited here is from the “next” development documentation. Check the documentation for the release you deploy, particularly for sealing and auto-unseal behavior.
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