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Deny-Route-NextHopVirtualAppliance.json
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Deny-Route-NextHopVirtualAppliance.json
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{
"$schema": "https://schema.management.azure.com/schemas/2018-05-01/subscriptionDeploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"variables": {
"policyName": "Deny-Route-NextHopVirtualAppliance",
"policyDescription": "Deny route with address prefix 0.0.0.0/0 not pointing to the virtual appliance. Both creating routes as a standalone resource or nested within their parent resource route table are considered.",
"policyCategory": "Network",
"policyAssignmentParameters": {
"routeTableSettings": {
"value": {
"northeurope": {
"virtualApplianceIpAddress": "10.0.0.23"
},
"westeurope": {
"virtualApplianceIpAddress": "10.1.0.23"
},
"disabled": {
"virtualApplianceIpAddress": ""
}
}
}
}
},
"resources": [
{
"name": "[variables('policyName')]",
"type": "Microsoft.Authorization/policyDefinitions",
"apiVersion": "2020-03-01",
"properties": {
"policyType": "Custom",
"mode": "All",
"displayName": "[variables('policyName')]",
"description": "[variables('policyDescription')]",
"metadata": {
"category": "[variables('policyCategory')]"
},
"parameters": {
"routeTableSettings": {
"type": "Object",
"metadata": {
"displayName": "Route Table Settings",
"description": "Location-specific settings for route tables."
}
}
},
"policyRule": {
"if": {
"anyOf": [
{
"allOf": [
{
"field": "type",
"equals": "Microsoft.Network/routeTables"
},
{
"count": {
"field": "Microsoft.Network/routeTables/routes[*]",
"where": {
"allOf": [
{
"field": "Microsoft.Network/routeTables/routes[*].addressPrefix",
"equals": "0.0.0.0/0"
},
{
"anyOf": [
{
"field": "Microsoft.Network/routeTables/routes[*].nextHopType",
"notEquals": "VirtualAppliance"
},
{
"field": "Microsoft.Network/routeTables/routes[*].nextHopIpAddress",
"notEquals": "[[parameters('routeTableSettings')[field('location')].virtualApplianceIpAddress]"
}
]
}
]
}
},
"greater": 0
}
]
},
{
"allOf": [
{
"field": "type",
"equals": "Microsoft.Network/routeTables/routes"
},
{
"field": "Microsoft.Network/routeTables/routes/addressPrefix",
"equals": "0.0.0.0/0"
},
{
"anyOf": [
{
"field": "Microsoft.Network/routeTables/routes/nextHopType",
"notEquals": "VirtualAppliance"
},
{
"field": "Microsoft.Network/routeTables/routes/nextHopIpAddress",
"notEquals": "[[parameters('routeTableSettings')[field('location')].virtualApplianceIpAddress]"
}
]
}
]
}
]
},
"then": {
"effect": "deny"
}
}
}
},
{
"name": "[uniqueString(variables('policyName'))]",
"type": "Microsoft.Authorization/policyAssignments",
"apiVersion": "2020-03-01",
"properties": {
"displayName": "[variables('policyName')]",
"policyDefinitionId": "[resourceId('Microsoft.Authorization/policyDefinitions', variables('policyName'))]",
"parameters": "[variables('policyAssignmentParameters')]",
"description": "[variables('policyDescription')]",
"metadata": {
"category": "[variables('policyCategory')]"
},
"enforcementMode": "Default"
},
"dependsOn": [
"[resourceId('Microsoft.Authorization/policyDefinitions', variables('policyName'))]"
]
}
]
}