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AKS clusters use Key Vault to store secrets#

Security · Azure Kubernetes Service · Azure.AKS.SecretStore

Deploy AKS clusters with Secrets Store CSI Driver and store Secrets in Key Vayult.

Description#

AKS clusters may need to store and retrieve secrets, keys, and certificates. The Secrets Store CSI Driver provides cluster support to integrate with Key Vault. When enabled and configured secrets, keys, and certificates can be securely accessed from a pod.

The Secrets Store CSI Driver can automatically refresh secrets and keys periodically from Key Vault. To enable this feature, enable Secrets Store CSI Driver autorotation.

Avoid storing secrets to access Azure resources. Use a Managed Identity when possible instead of cryptographic keys or a regular service principal.

Recommendation#

Consider deploying AKS clusters with the Secrets Store CSI Driver and store Secrets in Key Vault.

Examples#

Configure with Azure template#

To deploy AKS clusters that pass this rule:

  • Set Properties.addonProfiles.azureKeyvaultSecretsProvider.enabled to true.

For example:

{
    "type": "Microsoft.ContainerService/managedClusters",
    "apiVersion": "2021-07-01",
    "name": "[parameters('clusterName')]",
    "location": "[parameters('location')]",
    "identity": {
        "type": "UserAssigned",
        "userAssignedIdentities": {
            "[format('{0}', resourceId('Microsoft.ManagedIdentity/userAssignedIdentities', parameters('identityName')))]": {}
        }
    },
    "properties": {
        "kubernetesVersion": "[parameters('kubernetesVersion')]",
        "enableRBAC": true,
        "dnsPrefix": "[parameters('dnsPrefix')]",
        "agentPoolProfiles": "[variables('allPools')]",
        "aadProfile": {
            "managed": true,
            "enableAzureRBAC": true,
            "adminGroupObjectIDs": "[parameters('clusterAdmins')]",
            "tenantID": "[subscription().tenantId]"
        },
        "networkProfile": {
            "networkPlugin": "azure",
            "networkPolicy": "azure",
            "loadBalancerSku": "standard",
            "serviceCidr": "[variables('serviceCidr')]",
            "dnsServiceIP": "[variables('dnsServiceIP')]",
            "dockerBridgeCidr": "[variables('dockerBridgeCidr')]"
        },
        "autoUpgradeProfile": {
            "upgradeChannel": "stable"
        },
        "addonProfiles": {
            "httpApplicationRouting": {
                "enabled": false
            },
            "azurepolicy": {
                "enabled": true,
                "config": {
                    "version": "v2"
                }
            },
            "omsagent": {
                "enabled": true,
                "config": {
                    "logAnalyticsWorkspaceResourceID": "[parameters('workspaceId')]"
                }
            },
            "kubeDashboard": {
                "enabled": false
            },
            "azureKeyvaultSecretsProvider": {
                "enabled": true,
                "config": {
                    "enableSecretRotation": "true"
                }
            }
        }
    },
    "tags": "[parameters('tags')]",
    "dependsOn": [
        "[resourceId('Microsoft.ManagedIdentity/userAssignedIdentities', parameters('identityName'))]"
    ]
}

Configure with Bicep#

To deploy AKS clusters that pass this rule:

  • Set Properties.addonProfiles.azureKeyvaultSecretsProvider.enabled to true.

For example:

resource cluster 'Microsoft.ContainerService/managedClusters@2021-07-01' = {
  location: location
  name: clusterName
  identity: {
    type: 'UserAssigned'
    userAssignedIdentities: {
      '${identity.id}': {}
    }
  }
  properties: {
    kubernetesVersion: kubernetesVersion
    enableRBAC: true
    dnsPrefix: dnsPrefix
    agentPoolProfiles: allPools
    aadProfile: {
      managed: true
      enableAzureRBAC: true
      adminGroupObjectIDs: clusterAdmins
      tenantID: subscription().tenantId
    }
    networkProfile: {
      networkPlugin: 'azure'
      networkPolicy: 'azure'
      loadBalancerSku: 'standard'
      serviceCidr: serviceCidr
      dnsServiceIP: dnsServiceIP
      dockerBridgeCidr: dockerBridgeCidr
    }
    autoUpgradeProfile: {
      upgradeChannel: 'stable'
    }
    addonProfiles: {
      httpApplicationRouting: {
        enabled: false
      }
      azurepolicy: {
        enabled: true
        config: {
          version: 'v2'
        }
      }
      omsagent: {
        enabled: true
        config: {
          logAnalyticsWorkspaceResourceID: workspaceId
        }
      }
      kubeDashboard: {
        enabled: false
      }
      azureKeyvaultSecretsProvider: {
        enabled: true
        config: {
          enableSecretRotation: 'true'
        }
      }
    }
  }
  tags: tags
}

Configure with Azure CLI#

az aks enable-addons --addons azure-keyvault-secrets-provider -n '<name>' -g '<resource_group>'

Last update: 2021-12-12