feat(arm): CKV_AZURE_92 to Ensure that Virtual Machines use managed disks

checkov/arm/checks/resource/VMStorageOsDisk.py

@@ -0,0 +1,36 @@
+from typing import Any, Dict
+
+from checkov.common.models.enums import CheckResult, CheckCategories
+from checkov.arm.base_resource_value_check import BaseResourceCheck
+
+
+class VMStorageOsDisk(BaseResourceCheck):
+    def __init__(self) -> None:
+        name = "Ensure that Virtual Machines use managed disks"
+        id = "CKV_AZURE_92"
+        supported_resources = ("Microsoft.Compute/virtualMachines",)
+        categories = (CheckCategories.GENERAL_SECURITY,)
+        super().__init__(name=name, id=id, categories=categories, supported_resources=supported_resources)
+
+    def scan_resource_conf(self, conf: Dict[str, Any]) -> CheckResult:
+        properties = conf.get('properties')
+        if not properties or not isinstance(properties, dict):
+            return CheckResult.PASSED
+        storage_profile = properties.get('storageProfile')
+        if not storage_profile or not isinstance(storage_profile, dict):
+            return CheckResult.PASSED
+        os_disk = storage_profile.get('osDisk')
+        data_disks = list(storage_profile.get('dataDisks', []))
+        if os_disk and isinstance(os_disk, dict) and "vhd" in os_disk:
+            self.evaluated_keys = ['os_disk']
+            return CheckResult.FAILED
+        if data_disks and any(isinstance(data_disk, dict) and "vhd" in data_disk for data_disk in data_disks):
+            self.evaluated_keys = ['data_disks']
+            return CheckResult.FAILED
+        self.evaluated_keys = ['os_disk'] if os_disk else []
+        if data_disks:
+            self.evaluated_keys.append('data_disks')
+        return CheckResult.PASSED
+
+
+check = VMStorageOsDisk()

tests/arm/checks/resource/example_VMStorageOsDisk/fail.json

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+{
+  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
+  "contentVersion": "1.0.0.0",
+  "resources": [
+    {
+      "type": "Microsoft.Compute/virtualMachines",
+      "apiVersion": "2021-07-01",
+      "name": "fail-linux",
+      "location": "[resourceGroup().location]",
+      "properties": {
+        "hardwareProfile": {
+          "vmSize": "Standard_DS1_v2"
+        },
+        "storageProfile": {
+          "imageReference": {
+            "publisher": "Canonical",
+            "offer": "UbuntuServer",
+            "sku": "16.04-LTS",
+            "version": "latest"
+          },
+          "osDisk": {
+            "name": "myosdisk3",
+            "caching": "ReadWrite",
+            "createOption": "FromImage",
+            "managedDisk": {
+              "storageAccountType": "Standard_LRS"
+            },
+            "vhd": {
+              "uri": "someURI"
+            }
+          }
+        },
+        "osProfile": {
+          "computerName": "hostname",
+          "adminUsername": "testadmin",
+          "adminPassword": "Password1234!"
+        },
+        "networkProfile": {
+          "networkInterfaces": [
+            {
+              "id": "[resourceId('Microsoft.Network/networkInterfaces', 'main')]"
+            }
+          ]
+        }
+      },
+      "tags": {
+        "environment": "staging"
+      }
+    }
+  ],
+  "parameters": {
+    "prefix": {
+      "type": "string",
+      "defaultValue": "myprefix"
+    }
+  }
+}

tests/arm/checks/resource/example_VMStorageOsDisk/fail2.json

@@ -0,0 +1,59 @@
+{
+  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
+  "contentVersion": "1.0.0.0",
+  "resources": [
+    {
+      "type": "Microsoft.Compute/virtualMachines",
+      "apiVersion": "2021-07-01",
+      "name": "fail-windows",
+      "location": "[resourceGroup().location]",
+      "properties": {
+        "hardwareProfile": {
+          "vmSize": "Standard_DS1_v2"
+        },
+        "storageProfile": {
+          "imageReference": {
+            "publisher": "MicrosoftWindowsServer",
+            "offer": "WindowsServer",
+            "sku": "2019-Datacenter",
+            "version": "latest"
+          },
+          "dataDisks": [
+            {
+              "name": "mydatadisk1",
+              "caching": "ReadWrite",
+              "createOption": "Empty",
+              "managedDisk": {
+                "storageAccountType": "Standard_LRS"
+              },
+              "vhd": {
+                "uri": "someURI"
+              }
+            }
+          ]
+        },
+        "osProfile": {
+          "computerName": "hostname",
+          "adminUsername": "testadmin",
+          "adminPassword": "Password1234!"
+        },
+        "networkProfile": {
+          "networkInterfaces": [
+            {
+              "id": "[resourceId('Microsoft.Network/networkInterfaces', 'main')]"
+            }
+          ]
+        }
+      },
+      "tags": {
+        "environment": "staging"
+      }
+    }
+  ],
+  "parameters": {
+    "prefix": {
+      "type": "string",
+      "defaultValue": "myprefix"
+    }
+  }
+}

tests/arm/checks/resource/example_VMStorageOsDisk/pass.json

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+{
+  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
+  "contentVersion": "1.0.0.0",
+  "resources": [
+    {
+      "type": "Microsoft.Compute/virtualMachines",
+      "apiVersion": "2021-07-01",
+      "name": "pass-linux",
+      "location": "[resourceGroup().location]",
+      "properties": {
+        "hardwareProfile": {
+          "vmSize": "Standard_DS1_v2"
+        },
+        "storageProfile": {
+          "imageReference": {
+            "publisher": "Canonical",
+            "offer": "UbuntuServer",
+            "sku": "16.04-LTS",
+            "version": "latest"
+          },
+          "osDisk": {
+            "name": "myosdisk1",
+            "caching": "ReadWrite",
+            "createOption": "FromImage",
+            "managedDisk": {
+              "storageAccountType": "Standard_LRS"
+            }
+          }
+        },
+        "osProfile": {
+          "computerName": "hostname",
+          "adminUsername": "testadmin",
+          "adminPassword": "Password1234!"
+        },
+        "networkProfile": {
+          "networkInterfaces": [
+            {
+              "id": "[resourceId('Microsoft.Network/networkInterfaces', 'main')]"
+            }
+          ]
+        }
+      },
+      "tags": {
+        "environment": "staging"
+      }
+    }
+  ],
+  "parameters": {
+    "prefix": {
+      "type": "string",
+      "defaultValue": "myprefix"
+    }
+  }
+}

tests/arm/checks/resource/example_VMStorageOsDisk/pass2.json

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+{
+  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
+  "contentVersion": "1.0.0.0",
+  "resources": [
+    {
+      "type": "Microsoft.Compute/virtualMachines",
+      "apiVersion": "2021-07-01",
+      "name": "pass-windows",
+      "location": "[resourceGroup().location]",
+      "properties": {
+        "hardwareProfile": {
+          "vmSize": "Standard_DS1_v2"
+        },
+        "storageProfile": {
+          "imageReference": {
+            "publisher": "MicrosoftWindowsServer",
+            "offer": "WindowsServer",
+            "sku": "2019-Datacenter",
+            "version": "latest"
+          },
+          "osDisk": {
+            "name": "myosdisk2",
+            "caching": "ReadWrite",
+            "createOption": "FromImage",
+            "managedDisk": {
+              "storageAccountType": "Standard_LRS"
+            }
+          }
+        },
+        "osProfile": {
+          "computerName": "hostname",
+          "adminUsername": "testadmin",
+          "adminPassword": "Password1234!"
+        },
+        "networkProfile": {
+          "networkInterfaces": [
+            {
+              "id": "[resourceId('Microsoft.Network/networkInterfaces', 'main')]"
+            }
+          ]
+        }
+      },
+      "tags": {
+        "environment": "staging"
+      }
+    }
+  ],
+  "parameters": {
+    "prefix": {
+      "type": "string",
+      "defaultValue": "myprefix"
+    }
+  }
+}

tests/arm/checks/resource/test_VMStorageOsDisk.py

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+import unittest
+from pathlib import Path
+
+from checkov.runner_filter import RunnerFilter
+from checkov.arm.checks.resource.VMStorageOsDisk import check
+from checkov.arm.runner import Runner
+
+
+class TestVMStorageOsDisk(unittest.TestCase):
+
+    def test(self):
+        # given
+        test_files_dir = Path(__file__).parent / "example_VMStorageOsDisk"
+
+        # when
+        report = Runner().run(root_folder=str(test_files_dir), runner_filter=RunnerFilter(checks=[check.id]))
+
+        # then
+        summary = report.get_summary()
+
+        passing_resources = {
+            "Microsoft.Compute/virtualMachines.pass-linux",
+            "Microsoft.Compute/virtualMachines.pass-windows",
+        }
+        failing_resources = {
+            "Microsoft.Compute/virtualMachines.fail-linux",
+            "Microsoft.Compute/virtualMachines.fail-windows",
+        }
+
+        passed_check_resources = {c.resource for c in report.passed_checks}
+        failed_check_resources = {c.resource for c in report.failed_checks}
+
+        self.assertEqual(summary["passed"], 2)
+        self.assertEqual(summary["failed"], 2)
+        self.assertEqual(summary["skipped"], 0)
+        self.assertEqual(summary["parsing_errors"], 0)
+        self.assertEqual(summary["resource_count"], 4)  # 3 unknown
+
+        self.assertEqual(passing_resources, passed_check_resources)
+        self.assertEqual(failing_resources, failed_check_resources)
+
+
+if __name__ == '__main__':
+    unittest.main()