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Barbican Source Charm
THIS CHARM IS FOR EXPERIMENTAL USE AT PRESENT.
This repository is for the reactive, layered, Barbican source charm. From the wiki 'Barbican is a REST API designed for the secure storage, provisioning and management of secrets such as passwords, encryption keys and X.509 Certificates. It is aimed at being useful for all environments, including large ephemeral Clouds.'
Barbican can be used without an HSM for test purposes.
The Barbican charm currently supports the following plugins:
However, due to an odd quirk of interelating software issues, barbican + SoftHSM2 + OpenSSL < 1.0.2h is not functionaly due to a missing feature in OpenSSL (EVP_aes_128_wrap_pad specifically).
Thus the plugin interface is currently provided to show how to interface an HSM to the barbican charm.
Creating the primary MKEK and primary HMAC
Barbican (can use|uses) a Master Key Encryption Key (MKEK) scheme to wrap other keys so that in the course of issuing new encryption keys, it does not exhaust the storage capacity of an HSM.
See KMIP MKEK Model Plugin for more details.
Barbican itself can generate the MKEK and HMAC keys and store them in the associated HSM through the use of two actions 'generate-mkek' and 'generate-hmac'.
The names of the keys are stored in the configuration for the service as 'mkek-label' and 'hmac-label'. These default to 'primarymkek' and 'primaryhmac' respectively.
Note that these keys are not recoverable from the HSM. If the HSM has already been configured with these keys then these actions would overwrite the existing key. So only use them for the initial implementation or to change the MKEK and HMAC keys in the HSM.
Use of actions
For juju 1.x:
juju action do generate-mkek
For juju 2.x:
juju run-action generate-mkek
Note that, depending on the HSM, it may only be possible to do this ONCE as the HSM may reject setting up the keys more than once.
The Barbican charm has to be able to set
barbican-api.conf file. This data comes via the
interface from a charm (probably a subordinate) that provides the interface.
barbican-hsm interface the data is provided in the
method of the interface (or if it is adapted) in the
The theory of operation for the crypto plugin is that a local library that supports the PKCS#11 interface that Barbican can talk to locally.
Note(AJK): it is not clear yet how a clustered Barbican can be created with a single HSM backend. It's likely to be a separate piece of hardward with a local library that talks to it.
In order for Barbican to be configured for the example softhsm2 library, the configuration file needs to include the entries:
[crypto] enabled_crypto_plugins = p11_crypto [p11_crypto_plugin] library_path = '/usr/lib/libCryptoki2_64.so' login = 'catt' mkek_label = 'primarymkek' mkek_length = 32 hmac_label = 'primaryhmac' slot_id = <slot_id>
Note that the /var/lib/softhsm/tokens directory HAS to exist as otherwise the softhsm2-util command won't work.