open-vault/website/source/docs/secrets/cubbyhole/index.html.md

layout	page_title	sidebar_current	description
docs	Secret Backend: Cubbyhole	docs-secrets-cubbyhole	The cubbyhole secret backend can store arbitrary secrets scoped to a single token.

Cubbyhole Secret Backend

Name: cubbyhole

The cubbyhole secret backend is used to store arbitrary secrets within the configured physical storage for Vault. It is mounted at the cubbyhole/ prefix by default and cannot be mounted elsewhere or removed.

This backend differs from the generic backend in that the generic backend's values are accessible to any token with read privileges on that path. In cubbyhole, paths are scoped per token; no token can access another token's cubbyhole, whether to read, write, list, or for any other operation. When the token expires, its cubbyhole is destroyed.

Also unlike the generic backend, because the cubbyhole's lifetime is linked to that of an authentication token, there is no concept of a TTL or refresh interval for values contained in the token's cubbyhole.

Writing to a key in the cubbyhole backend will replace the old value; the sub-fields are not merged together.

Response Wrapping

Starting in Vault 0.6, almost any response (except those from sys/ endpoints) from Vault can be wrapped (see the Response Wrapping concept page for details).

The TTL for the token is set by the client using the X-Vault-Wrap-TTL header and can be either an integer number of seconds or a string duration of seconds (15s), minutes (20m), or hours (25h). When using the Vault CLI, you can set this via the -wrap-ttl parameter. Response wrapping is per-request; it is the presence of a value in this header that activates wrapping of the response.

If a client requests wrapping:

1. The original response is serialized to JSON
2. A new single-use token is generated with a TTL as supplied by the client
3. Internally, the original response JSON is stored in the single-use token's cubbyhole.
4. A new response is generated, with the token ID and the token TTL stored in the new response's wrap_info dict
5. The new response is returned to the caller

To get the original value, if using the API, perform a write on sys/wrapping/unwrap, passing in the wrapping token ID. The original value will be returned.

If using the CLI, passing the wrapping token's ID to the vault unwrap command will return the original value; -format and -field can be set like with vault read.

If the original response is an authentication response containing a token, the token's accessor will be made available to the caller. This allows a privileged caller to generate tokens for clients and be able to manage the tokens' lifecycle while not being exposed to the actual client token IDs.

Quick Start

The cubbyhole backend allows for writing keys with arbitrary values.

As an example, we can write a new key "foo" to the cubbyhole backend, which is mounted at cubbyhole/:

$ vault write cubbyhole/foo \
    zip=zap
Success! Data written to: cubbyhole/foo

This writes the key with the "zip" field set to "zap". We can test this by doing a read:

$ vault read cubbyhole/foo
Key           	Value
zip           	zap

As expected, the value previously set is returned to us.

API

The Cubbyhole secret backend has a full HTTP API. Please see the Cubbyhole secret backend API for more details.