Azure ARM templates configuration scanning
Checkov supports the evaluation of policies on your ARM templates files. When using checkov to scan a directory that contains a ARM template it will validate if the file is compliant with Azure best practices such as having logging and auditing enabled, Ensure that ‘Public access level’ is set to Private for blob containers, Ensure no SQL Databases allow ingress from 0.0.0.0/0 (ANY IP), and more.
Full list of ARM templates policies checks can be found here.
Example misconfigured ARM templates
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"webAppName": {
"type": "string",
"defaultValue" : "AzureLinuxApp",
"metadata": {
"description": "Base name of the resource such as web app name and app service plan "
},
"minLength": 2
},
"sku":{
"type": "string",
"defaultValue" : "S1",
"metadata": {
"description": "The SKU of App Service Plan "
}
},
"linuxFxVersion" : {
"type": "string",
"defaultValue" : "php|7.0",
"metadata": {
"description": "The Runtime stack of current web app"
}
},
"location": {
"type": "string",
"defaultValue": "[resourceGroup().location]",
"metadata": {
"description": "Location for all resources."
}
}
},
"variables": {
"webAppPortalName": "[concat(parameters('webAppName'), '-webapp')]",
"appServicePlanName": "[concat('AppServicePlan-', parameters('webAppName'))]"
},
"resources": [
{
"type": "Microsoft.Web/serverfarms",
"apiVersion": "2018-02-01",
"name": "[variables('appServicePlanName')]",
"location": "[parameters('location')]",
"sku": {
"name": "[parameters('sku')]"
},
"kind": "linux",
"properties":{
"reserved":true
}
},
{
"type": "Microsoft.Web/sites",
"apiVersion": "2018-11-01",
"name": "[variables('webAppPortalName')]",
"location": "[parameters('location')]",
"kind": "app",
"dependsOn": [
"[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
],
"properties": {
"serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]",
"siteConfig": {
"linuxFxVersion": "[parameters('linuxFxVersion')]"
}
}
}
]
}
Running in CLI
checkov -d . --framework arm
Example output
_ _
___| |__ ___ ___| | _______ __
/ __| '_ \ / _ \/ __| |/ / _ \ \ / /
| (__| | | | __/ (__| < (_) \ V /
\___|_| |_|\___|\___|_|\_\___/ \_/
By bridgecrew.io | version: 2.0.723
arm scan results:
Passed checks: 0, Failed checks: 5, Skipped checks: 0
Check: CKV_AZURE_15: "Ensure web app is using the latest version of TLS encryption"
FAILED for resource: Microsoft.Web/sites.[concat(parameters('webAppName'), '-webapp')]
File: /example.json:53-68
Guide: https://docs.bridgecrew.io/docs/bc_azr_networking_6
53 | {
54 | "type": "Microsoft.Web/sites",
55 | "apiVersion": "2018-11-01",
56 | "name": "[variables('webAppPortalName')]",
57 | "location": "[parameters('location')]",
58 | "kind": "app",
59 | "dependsOn": [
60 | "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
61 | ],
62 | "properties": {
63 | "serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]",
64 | "siteConfig": {
65 | "linuxFxVersion": "[parameters('linuxFxVersion')]"
66 | }
67 | }
68 | }
Check: CKV_AZURE_17: "Ensure the web app has 'Client Certificates (Incoming client certificates)' set"
FAILED for resource: Microsoft.Web/sites.[concat(parameters('webAppName'), '-webapp')]
File: /example.json:53-68
Guide: https://docs.bridgecrew.io/docs/bc_azr_networking_7
53 | {
54 | "type": "Microsoft.Web/sites",
55 | "apiVersion": "2018-11-01",
56 | "name": "[variables('webAppPortalName')]",
57 | "location": "[parameters('location')]",
58 | "kind": "app",
59 | "dependsOn": [
60 | "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
61 | ],
62 | "properties": {
63 | "serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]",
64 | "siteConfig": {
65 | "linuxFxVersion": "[parameters('linuxFxVersion')]"
66 | }
67 | }
68 | }
Check: CKV_AZURE_14: "Ensure web app redirects all HTTP traffic to HTTPS in Azure App Service"
FAILED for resource: Microsoft.Web/sites.[concat(parameters('webAppName'), '-webapp')]
File: /example.json:53-68
Guide: https://docs.bridgecrew.io/docs/bc_azr_networking_5
53 | {
54 | "type": "Microsoft.Web/sites",
55 | "apiVersion": "2018-11-01",
56 | "name": "[variables('webAppPortalName')]",
57 | "location": "[parameters('location')]",
58 | "kind": "app",
59 | "dependsOn": [
60 | "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
61 | ],
62 | "properties": {
63 | "serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]",
64 | "siteConfig": {
65 | "linuxFxVersion": "[parameters('linuxFxVersion')]"
66 | }
67 | }
68 | }
Check: CKV_AZURE_16: "Ensure that Register with Azure Active Directory is enabled on App Service"
FAILED for resource: Microsoft.Web/sites.[concat(parameters('webAppName'), '-webapp')]
File: /example.json:53-68
Guide: https://docs.bridgecrew.io/docs/bc_azr_iam_1
53 | {
54 | "type": "Microsoft.Web/sites",
55 | "apiVersion": "2018-11-01",
56 | "name": "[variables('webAppPortalName')]",
57 | "location": "[parameters('location')]",
58 | "kind": "app",
59 | "dependsOn": [
60 | "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
61 | ],
62 | "properties": {
63 | "serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]",
64 | "siteConfig": {
65 | "linuxFxVersion": "[parameters('linuxFxVersion')]"
66 | }
67 | }
68 | }
Check: CKV_AZURE_18: "Ensure that 'HTTP Version' is the latest if used to run the web app"
FAILED for resource: Microsoft.Web/sites.[concat(parameters('webAppName'), '-webapp')]
File: /example.json:53-68
Guide: https://docs.bridgecrew.io/docs/bc_azr_networking_8
53 | {
54 | "type": "Microsoft.Web/sites",
55 | "apiVersion": "2018-11-01",
56 | "name": "[variables('webAppPortalName')]",
57 | "location": "[parameters('location')]",
58 | "kind": "app",
59 | "dependsOn": [
60 | "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
61 | ],
62 | "properties": {
63 | "serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]",
64 | "siteConfig": {
65 | "linuxFxVersion": "[parameters('linuxFxVersion')]"
66 | }
67 | }
68 | }