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policy.tf
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##### Azure policies
#### * Enforces secure defaults for the resources deployed on Azure
### * https://docs.microsoft.com/en-us/azure/governance/policy/overview
## * https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/policy_definition
resource "azurerm_policy_definition" "nsg_deny_inbound_ports" {
name = "NSG deny inbound on specific ports"
policy_type = "Custom"
mode = "All"
display_name = "Deny Network Security Group Rules where all inbound traffic is allowed on certain ports"
management_group_id = azurerm_management_group.your_root_managementgroup.id
metadata = <<METADATA
{
"category": "Network"
}
METADATA
parameters = <<PARAMETERS
{
"deniedPorts": {
"type": "Array",
"metadata": {
"displayName": "Ports to block",
"description": "The inbound ports that should be blocked"
}
}
}
PARAMETERS
policy_rule = <<POLICY_RULE
{
"if": {
"allOf": [
{
"field": "type",
"equals": "Microsoft.Network/networkSecurityGroups"
},
{
"count": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*]",
"where": {
"allOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].access",
"equals": "Allow"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].direction",
"equals": "Inbound"
},
{
"anyOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRange",
"in": "[parameters('deniedPorts')]"
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRanges[*]",
"notIn": "[parameters('deniedPorts')]"
}
}
]
},
{
"anyOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].sourceAddressPrefix",
"in": [
"*",
"0.0.0.0/0",
"Internet"
]
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].sourceAddressPrefixes[*]",
"notIn": [
"*",
"0.0.0.0/0",
"Internet"
]
}
}
]
}
]
}
},
"greaterOrEquals": 1
}
]
},
"then": {
"effect": "deny"
}
}
POLICY_RULE
}
resource "azurerm_policy_definition" "nsr_deny_inbound_ports" {
name = "NSR deny inbound on specific ports"
policy_type = "Custom"
mode = "All"
display_name = "Deny Network Security Rules where all inbound traffic is allowed on certain ports"
# management_group_id = azurerm_management_group.your_root_managementgroup.id # <- if you want to attach the policy at the management-group level
metadata = <<METADATA
{
"category": "Network"
}
METADATA
parameters = <<PARAMETERS
{
"deniedPorts": {
"type": "Array",
"metadata": {
"displayName": "Ports to block",
"description": "The inbound ports that should be blocked"
}
}
}
PARAMETERS
policy_rule = <<POLICY_RULE
{
"if": {
"allOf": [
{
"field": "type",
"equals": "Microsoft.Network/networkSecurityGroups/securityRules"
},
{
"allOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules/access",
"equals": "Allow"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules/direction",
"equals": "Inbound"
},
{
"anyOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange",
"in": "[parameters('deniedPorts')]"
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
"notIn": "[parameters('deniedPorts')]"
}
}
]
},
{
"anyOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules/sourceAddressPrefix",
"in": [
"*",
"0.0.0.0/0",
"Internet"
]
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules/sourceAddressPrefixes[*]",
"notIn": [
"*",
"0.0.0.0/0",
"Internet"
]
}
}
]
}
]
}
]
},
"then": {
"effect": "deny"
}
}
POLICY_RULE
}
resource "azurerm_policy_definition" "denied_regions" {
name = "Deny specific regions"
policy_type = "Custom"
mode = "All"
display_name = "Deny resources creation on certain specific regions"
# management_group_id = azurerm_management_group.your_root_managementgroup.id # <- if you want to attach the policy at the management-group level
metadata = <<METADATA
{
"category": "General"
}
METADATA
parameters = <<PARAMETERS
{
"deniedRegions": {
"type": "Array",
"metadata": {
"displayName": "Regions to block",
"description": "The Regions where it is not allowed to deploy resources"
}
}
}
PARAMETERS
policy_rule = <<POLICY_RULE
{
"if": {
"field": "location",
"in": "[parameters('deniedRegions')]"
},
"then": {
"effect": "deny"
}
}
POLICY_RULE
}