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Policy Rule
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{
"properties": {
"displayName": "[Preview]: All Internet traffic should be routed via your deployed Azure Firewall",
"policyType": "BuiltIn",
"mode": "All",
"description": "Azure Security Center has identified that some of your subnets aren't protected with a next generation firewall. Protect your subnets from potential threats by restricting access to them with Azure Firewall or a supported next generation firewall",
"metadata": {
"version": "2.0.0-preview",
"category": "Network",
"preview": true
},
"parameters": {
"effect": {
"type": "String",
"metadata": {
"displayName": "[Preview]: Effect",
"description": "Enable or disable All Internet traffic should be routed via your deployed Azure Firewall"
},
"allowedValues": [
"AuditIfNotExists",
"Disabled"
],
"defaultValue": "AuditIfNotExists"
}
},
"policyRule": {
"if": {
"allOf": [
{
"field": "type",
"equals": "Microsoft.Network/virtualNetworks/subnets"
},
{
"field": "Microsoft.Network/virtualNetworks/subnets/routeTable",
"exists": false
},
{
"count": {
"field": "Microsoft.Network/virtualNetworks/subnets/ipConfigurations[*]"
},
"greaterOrEquals": 2
},
{
"field": "name",
"notIn": [
"AzureFirewallSubnet",
"GatewaySubnet",
"AzureBastionSubnet"
]
}
]
},
"then": {
"effect": "[parameters('effect')]",
"details": {
"type": "Microsoft.Network/networkSecurityGroups",
"name": "[string(last(split(field('Microsoft.Network/virtualNetworks/subnets/networkSecurityGroup.id'), '/')))]",
"resourceGroupName": "[string(take(skip(split(field('Microsoft.Network/virtualNetworks/subnets/networkSecurityGroup.id'), '/'), 4), 1))]",
"existenceCondition": {
"allOf": [
{
"count": {
"field": "Microsoft.Network/networkSecurityGroups/subnets[*]",
"where": {
"field": "Microsoft.Network/networkSecurityGroups/subnets[*].id",
"like": "[concat('/subscriptions/', subscription().subscriptionId, '/resourceGroups/*/providers/Microsoft.Network/virtualNetworks/', first(split(field('fullName'), '/')), '/subnets/', field('name'))]"
}
},
"equals": 1
},
{
"count": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*]",
"where": {
"allOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].direction",
"equals": "Outbound"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].access",
"equals": "Deny"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].destinationAddressPrefix",
"in": [
"*",
"Internet"
]
},
{
"anyOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRange",
"in": [
"*",
"0-65535"
]
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRanges",
"notEquals": "0-65535"
}
}
]
}
]
}
},
"greater": 0
},
{
"count": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*]",
"where": {
"allOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].direction",
"equals": "Outbound"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].access",
"equals": "Allow"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].destinationAddressPrefix",
"in": [
"*",
"Internet"
]
}
]
}
},
"equals": 0
}
]
}
}
}
}
},
"id": "/providers/Microsoft.Authorization/policyDefinitions/fc5e4038-4584-4632-8c85-c0448d374b2c",
"type": "Microsoft.Authorization/policyDefinitions",
"name": "fc5e4038-4584-4632-8c85-c0448d374b2c"
}
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