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