feat(query): implements "Beta - Backup Vault Without Immutability"

assets/queries/terraform/azure/backup_vault_without_immutability/metadata.json

@@ -0,0 +1,14 @@
+{
+  "id": "7a0164a5-ec6e-40b2-938d-ab3edfd37dcd",
+  "queryName": "Beta - Backup Vault Without Immutability",
+  "severity": "HIGH",
+  "category": "Backup",
+  "descriptionText": "No 'azurerm_data_protection_backup_vault' resource should set 'immutability' to 'Disabled'. By locking the setting, malicious actors are prevented from disabling the setting and deleting backups.",
+  "descriptionUrl": "https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/data_protection_backup_vault#immutability-1",
+  "platform": "Terraform",
+  "descriptionID": "7a0164a5",
+  "cloudProvider": "azure",
+  "cwe": "754",
+  "riskScore": "6.0",
+  "experimental": "true"
+}

assets/queries/terraform/azure/backup_vault_without_immutability/query.rego

@@ -0,0 +1,40 @@
+package Cx
+
+import data.generic.common as common_lib
+import data.generic.terraform as tf_lib
+
+CxPolicy[result] {
+	resource := input.document[i].resource.azurerm_data_protection_backup_vault[name]
+
+	results := get_results(resource, name)
+
+	result := {
+		"documentId": input.document[i].id,
+		"resourceType": "azurerm_data_protection_backup_vault",
+		"resourceName": tf_lib.get_resource_name(resource, name),
+		"searchKey": results.searchKey,
+		"issueType": results.issueType,
+		"keyExpectedValue": sprintf("'azurerm_data_protection_backup_vault[%s].immutability' should be set and enabled", [name]),
+		"keyActualValue": results.keyActualValue,
+		"searchLine": results.searchLine
+	}
+}
+
+get_results(resource, name) = results {
+	not common_lib.valid_key(resource, "immutability")
+	results := {
+		"searchKey": sprintf("azurerm_data_protection_backup_vault[%s]", [name]),
+		"issueType": "MissingAttribute",
+		"keyActualValue": sprintf("'azurerm_data_protection_backup_vault[%s].immutability' is undefined or null", [name]),
+		"searchLine": common_lib.build_search_line(["resource", "azurerm_data_protection_backup_vault", name], [])
+	}
+
+} else = results {
+	resource.immutability == "Disabled"
+	results := {
+		"searchKey": sprintf("azurerm_data_protection_backup_vault[%s].immutability", [name]),
+		"issueType": "IncorrectValue",
+		"keyActualValue": sprintf("'azurerm_data_protection_backup_vault[%s].immutability' is set to 'Disabled'", [name]),
+		"searchLine": common_lib.build_search_line(["resource", "azurerm_data_protection_backup_vault", name, "immutability"], [])
+	}
+}

assets/queries/terraform/azure/backup_vault_without_immutability/test/negative1.tf

@@ -0,0 +1,19 @@
+resource "azurerm_data_protection_backup_vault" "negative1" {
+  name                = "negative1-backup-vault"
+  resource_group_name = azurerm_resource_group.negative1.name
+  location            = azurerm_resource_group.negative1.location
+  datastore_type      = "VaultStore"
+  redundancy          = "LocallyRedundant"
+
+  immutability = "Unlocked"
+}
+
+resource "azurerm_data_protection_backup_vault" "negative2" {
+  name                = "negative2-backup-vault"
+  resource_group_name = azurerm_resource_group.negative2.name
+  location            = azurerm_resource_group.negative2.location
+  datastore_type      = "VaultStore"
+  redundancy          = "LocallyRedundant"
+
+  immutability = "Locked"
+}

assets/queries/terraform/azure/backup_vault_without_immutability/test/positive1.tf

@@ -0,0 +1,19 @@
+resource "azurerm_data_protection_backup_vault" "positive1" {
+  name                = "positive1-backup-vault"
+  resource_group_name = azurerm_resource_group.positive1.name
+  location            = azurerm_resource_group.positive1.location
+  datastore_type      = "VaultStore"
+  redundancy          = "LocallyRedundant"
+
+  # missing immutability - defaults to Disabled
+}
+
+resource "azurerm_data_protection_backup_vault" "positive2" {
+  name                = "positive2-backup-vault"
+  resource_group_name = azurerm_resource_group.positive2.name
+  location            = azurerm_resource_group.positive2.location
+  datastore_type      = "VaultStore"
+  redundancy          = "LocallyRedundant"
+
+  immutability = "Disabled"
+}

assets/queries/terraform/azure/backup_vault_without_immutability/test/positive_expected_result.json

@@ -0,0 +1,12 @@
+[
+  {
+    "queryName": "Beta - Backup Vault Without Immutability",
+    "severity": "HIGH",
+    "line": 1
+  },
+  {
+    "queryName": "Beta - Backup Vault Without Immutability",
+    "severity": "HIGH",
+    "line": 18
+  }
+]

assets/similarityID_transition/terraform_azure.yaml

@@ -3,3 +3,7 @@ similarityIDChangeList:
       queryName: Sensitive Port Is Exposed To Wide Private Network
       observations: ""
       change: 5
+    - queryId: 7a0164a5-ec6e-40b2-938d-ab3edfd37dcd
+      queryName: Beta - Backup Vault Without Immutability
+      observations: ""
+      change: 2