doc: added docs for Azure KMS

Signed-off-by: Praveen M <m.praveen@ibm.com>
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Praveen M 2024-02-20 19:51:07 +05:30 committed by mergify[bot]
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## Features ## Features
- kms: added Azure Key Vault as a supported KMS in [PR](https://github.com/ceph/ceph-csi/pull/4455)
## NOTE ## NOTE

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This Secret is expected to be created by the tenant/user in each namespace where This Secret is expected to be created by the tenant/user in each namespace where
Ceph-CSI is used to create encrypted rbd volumes. Ceph-CSI is used to create encrypted rbd volumes.
#### Configuring Azure key vault
Ceph-CSI can be configured to use
[Azure key vault](https://azure.microsoft.com/en-in/products/key-vault),
for encrypting RBD volumes.
There are a few settings that need to be included in the [KMS configuration
file](../examples/kms/vault/kms-config.yaml):
1. `KMS_PROVIDER`: should be set to `azure-kv`.
1. `AZURE_CERT_SECRET_NAME`: name of the Kubernetes Secret (in the Namespace where
Ceph-CSI is deployed) which contains the credentials for communicating with
Azure. This defaults to `ceph-csi-azure-credentials`.
1. `AZURE_VAULT_URL`: URL to access the Azure Key Vault service.
1. `AZURE_CLIENT_ID`: Client ID of the Azure application object (service principal)
created in Azure Active Directory that serves as the username.
1. `AZURE_TENANT_ID`: Tenant ID of the service principal.
The [Secret with credentials](../examples/kms/vault/azure-credentials.yaml) for
the Azure KMS is expected to contain:
1. `CLIENT_CERT`: The client certificate used for authentication
with Azure Key Vault.
This Secret is expected to be created by the user in the namespace where Ceph-CSI
is deployed.
#### Configuring KMIP KMS #### Configuring KMIP KMS
The Key Management Interoperability Protocol (KMIP) is an extensible The Key Management Interoperability Protocol (KMIP) is an extensible

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# Encrypted volumes with Azure Key Vault
Azure Key Vault is a cloud service for securely storing and accessing secrets.
A secret is anything that you want to tightly control access to, such as API
keys, passwords, certificates, or cryptographic keys.
## Connection to Azure Key Vault
Below values are used to establish the connection to the Key Vault
service from the CSI driver and to make use of the secrets
`GetSecret`/`SetSecret`/`DeleteSecret` operations:
```text
* AZURE_VAULT_URL
The URL used to access the Azure Key Vault service.
* AZURE_CLIENT_ID
The Client ID of the Azure application object (also known as the service principal).
This ID serves as the username.
* AZURE_TENANT_ID
The Tenant ID associated with the service principal.
* CLIENT_CERT
The client certificate (which includes the private key and is not password protected)
used for authentication with Azure Key Vault.
```
### Values provided in the connection secret
Considering `AZURE_CLIENT_CERTIFICATE` is sensitive information,
it will be provided as a Kubernetes secret to the Ceph-CSI driver. The Ceph-CSI
KMS plugin interface for the Azure key vault will read the secret name from the
kms configMap and fetch the certificate.
### Values provided in the config map
`AZURE_VAULT_URL`, `AZURE_CLIENT_ID`, `AZURE_TENANT_ID` are part of the
KMS ConfigMap.
### Storage class values or configuration
The Storage class has to be enabled for encryption and `encryptionKMSID` has
to be provided which is the matching value in the kms config map.
## Volume Encrypt or Decrypt Operation
Ceph-CSI generate's unique passphrase for each volume to be used to
encrypt/decrypt. The passphrase is securely store in Azure key vault
using the `SetSecret` operation. At time of decrypt the passphrase is
retrieved from the key vault using the `GetSecret`operation.
## Volume Delete Operation
When the corresponding volume is deleted, the stored secret in the Azure Key
Vault will be deleted.
> Note: Ceph-CSI solely deletes the secret without permanent removal (purging).