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Add policy: Deploy DNS Security Policy VNet Link by Region #535

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241 changes: 241 additions & 0 deletions policyDefinitions/Network/deploy-dns-security-policy-vnet-link-by-region/azurepolicy.json
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{
"name": "5f17ac77-eb44-421c-b142-0fd591d188fd",
"type": "Microsoft.Authorization/policyDefinitions",
"properties": {
"displayName": "Deploy DNS Security Policy VNet Link by Region",
"description": "Creates a DNS Resolver Policy Virtual Network Link for every VNet using Azure-provided DNS, linking it to the corresponding regional DNS Security Policy in a central subscription. Uses a tag-based existence check and a cross-subscription nested deployment to create the link resource.",
"metadata": {
"version": "1.0.0",
"category": "Network"
},
"mode": "All",
"parameters": {
"effect": {
"type": "String",
"metadata": {
"displayName": "Effect",
"description": "DeployIfNotExists, AuditIfNotExists or Disabled the execution of the Policy"
},
"allowedValues": [
"DeployIfNotExists",
"AuditIfNotExists",
"Disabled"
],
"defaultValue": "DeployIfNotExists"
},
"securitySubscriptionId": {
"type": "String",
"metadata": {
"displayName": "Security Subscription ID",
"description": "Subscription ID where the DNS Resolver Policies are deployed."
}
},
"securityResourceGroup": {
"type": "String",
"metadata": {
"displayName": "Security Resource Group",
"description": "Resource group containing the DNS Resolver Policies."
}
},
"supportedLocations": {
"type": "Array",
"metadata": {
"displayName": "Supported Locations",
"description": "ARM location names where DNS Security Policies exist. VNets in other locations are ignored."
}
},
"locationToPolicyMap": {
"type": "Object",
"metadata": {
"displayName": "Location to Policy Name Map",
"description": "Maps ARM location name (key) to the DNS Resolver Policy resource name (value). Example: {\"westeurope\":\"weu-dnsrp-blocklist\"}"
}
}
},
"policyRule": {
"if": {
"allOf": [
{
"field": "type",
"equals": "Microsoft.Network/virtualNetworks"
},
{
"anyOf": [
{
"field": "Microsoft.Network/virtualNetworks/dhcpOptions.dnsServers",
"exists": false
},
{
"count": {
"field": "Microsoft.Network/virtualNetworks/dhcpOptions.dnsServers[*]"
},
"equals": 0
}
]
},
{
"field": "location",
"in": "[parameters('supportedLocations')]"
}
]
},
"then": {
"effect": "[parameters('effect')]",
"details": {
"type": "Microsoft.Network/virtualNetworks",
"name": "[field('name')]",
"existenceCondition": {
"field": "tags['dnsSecurityPolicyLinked']",
"exists": true
},
"roleDefinitionIds": [
"/providers/Microsoft.Authorization/roleDefinitions/4d97b98b-1d4f-4787-a291-c67834d212e7",
"/providers/Microsoft.Authorization/roleDefinitions/b24988ac-6180-42a0-ab88-20f7382dd24c"
],
"deployment": {
"properties": {
"mode": "incremental",
"parameters": {
"vnetName": {
"value": "[field('name')]"
},
"vnetResourceId": {
"value": "[field('id')]"
},
"vnetLocation": {
"value": "[field('location')]"
},
"vnetResourceGroup": {
"value": "[resourceGroup().name]"
},
"locationToPolicyMap": {
"value": "[parameters('locationToPolicyMap')]"
},
"securitySubscriptionId": {
"value": "[parameters('securitySubscriptionId')]"
},
"securityResourceGroup": {
"value": "[parameters('securityResourceGroup')]"
},
"existingTags": {
"value": "[if(empty(field('tags')), createObject(), field('tags'))]"
}
},
"template": {
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"vnetName": {
"type": "string"
},
"vnetResourceId": {
"type": "string"
},
"vnetLocation": {
"type": "string"
},
"vnetResourceGroup": {
"type": "string"
},
"locationToPolicyMap": {
"type": "object"
},
"securitySubscriptionId": {
"type": "string"
},
"securityResourceGroup": {
"type": "string"
},
"existingTags": {
"type": "object"
}
},
"variables": {
"cleanRg": "[toLower(replace(replace(replace(parameters('vnetResourceGroup'), '_', '-'), '.', '-'), ' ', '-'))]",
"cleanName": "[toLower(replace(replace(replace(parameters('vnetName'), '_', '-'), '.', '-'), ' ', '-'))]",
"linkName": "[take(concat(variables('cleanRg'), '-', variables('cleanName'), '-dnsl'), 80)]",
"policyName": "[parameters('locationToPolicyMap')[parameters('vnetLocation')]]",
"deployHash": "[take(uniqueString(parameters('vnetResourceId'), deployment().name), 8)]",
"crossSubDeployName": "[take(concat('dnslink-', variables('deployHash')), 64)]",
"mergedTags": "[union(parameters('existingTags'), createObject('dnsSecurityPolicyLinked', variables('policyName')))]"
},
"resources": [
{
"type": "Microsoft.Resources/deployments",
"apiVersion": "2022-09-01",
"name": "[variables('crossSubDeployName')]",
"subscriptionId": "[parameters('securitySubscriptionId')]",
"resourceGroup": "[parameters('securityResourceGroup')]",
"properties": {
"expressionEvaluationOptions": {
"scope": "inner"
},
"mode": "Incremental",
"template": {
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"policyName": {
"type": "string"
},
"linkName": {
"type": "string"
},
"vnetLocation": {
"type": "string"
},
"vnetResourceId": {
"type": "string"
}
},
"resources": [
{
"type": "Microsoft.Network/dnsResolverPolicies/virtualNetworkLinks",
"apiVersion": "2025-10-01-preview",
"name": "[concat(parameters('policyName'), '/', parameters('linkName'))]",
"location": "[parameters('vnetLocation')]",
"properties": {
"virtualNetwork": {
"id": "[parameters('vnetResourceId')]"
}
}
}
]
},
"parameters": {
"policyName": {
"value": "[variables('policyName')]"
},
"linkName": {
"value": "[variables('linkName')]"
},
"vnetLocation": {
"value": "[parameters('vnetLocation')]"
},
"vnetResourceId": {
"value": "[parameters('vnetResourceId')]"
}
}
}
},
{
"type": "Microsoft.Resources/tags",
"apiVersion": "2024-03-01",
"name": "default",
"scope": "[resourceId('Microsoft.Network/virtualNetworks', parameters('vnetName'))]",
"dependsOn": [
"[variables('crossSubDeployName')]"
],
"properties": {
"tags": "[variables('mergedTags')]"
}
}
]
}
}
}
}
}
}
}
}
43 changes: 43 additions & 0 deletions ...itions/Network/deploy-dns-security-policy-vnet-link-by-region/azurepolicy.parameters.json
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{
"effect": {
"type": "String",
"metadata": {
"displayName": "Effect",
"description": "DeployIfNotExists, AuditIfNotExists or Disabled the execution of the Policy"
},
"allowedValues": [
"DeployIfNotExists",
"AuditIfNotExists",
"Disabled"
],
"defaultValue": "DeployIfNotExists"
},
"securitySubscriptionId": {
"type": "String",
"metadata": {
"displayName": "Security Subscription ID",
"description": "Subscription ID where the DNS Resolver Policies are deployed."
}
},
"securityResourceGroup": {
"type": "String",
"metadata": {
"displayName": "Security Resource Group",
"description": "Resource group containing the DNS Resolver Policies."
}
},
"supportedLocations": {
"type": "Array",
"metadata": {
"displayName": "Supported Locations",
"description": "ARM location names where DNS Security Policies exist. VNets in other locations are ignored."
}
},
"locationToPolicyMap": {
"type": "Object",
"metadata": {
"displayName": "Location to Policy Name Map",
"description": "Maps ARM location name (key) to the DNS Resolver Policy resource name (value). Example: {\"westeurope\":\"weu-dnsrp-blocklist\"}"
}
}
}
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