Governance Policies Azure Compute Disk Encryption Set

Disk Encryption Set

Governance policies for Disk Encryption Set

Domain: azure-compute

Patterns

Name	Description
Disk Encryption Set with CMK and auto-rotation	Customer-managed key encryption with automatic key rotation

Anti-Patterns

Description	Instead
Do not rely solely on platform-managed encryption when compliance requires CMK	Deploy a Disk Encryption Set with customer-managed keys from Key Vault
Do not store encryption keys in the same Key Vault as application secrets	Use a dedicated Key Vault for disk encryption keys with restricted access

References

• Disk Encryption Sets documentation
• Customer-managed keys for managed disks

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Checks (4)

Check	Severity	Description
AZ-DES-001	Required	Create Disk Encryption Set with customer-managed key from Key Vault
AZ-DES-002	Required	Grant the Disk Encryption Set identity access to the Key Vault
AZ-DES-003	Required	Enable automatic key rotation to latest key version
AZ-DES-004	Recommended	Use EncryptionAtRestWithPlatformAndCustomerKeys for double encryption

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AZ-DES-001

Create Disk Encryption Set with customer-managed key from Key Vault

Severity: Required
Rationale: Customer-managed keys (CMK) provide control over encryption keys and meet compliance requirements
Agents: terraform-agent, bicep-agent, cloud-architect

Targets

• Microsoft.Compute/diskEncryptionSets

Companion Resources

Resource	Name	Purpose
Microsoft.KeyVault/vaults	kv-cmk	Key Vault with purge protection enabled for storing CMK encryption keys
Microsoft.KeyVault/vaults/keys	des-cmk-key	RSA 2048-bit or higher encryption key for Disk Encryption Set
Microsoft.Authorization/roleAssignments	Key Vault Crypto Service Encryption User	Grants DES identity permission to use Key Vault encryption keys

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AZ-DES-002

Grant the Disk Encryption Set identity access to the Key Vault

Severity: Required
Rationale: Without Key Vault access, the DES cannot retrieve the encryption key and disk operations will fail
Agents: terraform-agent, bicep-agent, cloud-architect

Targets

• Microsoft.Compute/diskEncryptionSets

Companion Resources

Resource	Name	Purpose
Microsoft.Compute/diskEncryptionSets	des-cmk	Disk Encryption Set with system-assigned identity for Key Vault access
Microsoft.KeyVault/vaults	kv-cmk	Key Vault with RBAC authorization for DES key access

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AZ-DES-003

Enable automatic key rotation to latest key version

Severity: Required
Rationale: Manual key rotation risks service disruption if keys expire; automatic rotation ensures continuity
Agents: terraform-agent, bicep-agent, cloud-architect

Targets

• Microsoft.Compute/diskEncryptionSets

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AZ-DES-004

Use EncryptionAtRestWithPlatformAndCustomerKeys for double encryption

Severity: Recommended
Rationale: Double encryption uses both platform-managed and customer-managed keys for defense in depth
Agents: terraform-agent, bicep-agent, cloud-architect, security-reviewer

Targets

• Microsoft.Compute/diskEncryptionSets

Companion Resources

Resource	Name	Purpose
Microsoft.KeyVault/vaults	kv-cmk	Key Vault with purge protection for double-encryption keys
Microsoft.KeyVault/vaults/keys	des-double-enc-key	RSA encryption key for platform-and-customer double encryption

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