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Copy pathDeny-MgmtPorts-From-Internet.json
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Deny-MgmtPorts-From-Internet.json
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{
"name": "Deny-MgmtPorts-From-Internet",
"type": "Microsoft.Authorization/policyDefinitions",
"apiVersion": "2021-06-01",
"scope": null,
"properties": {
"policyType": "Custom",
"mode": "All",
"displayName": "Management port access from the Internet should be blocked",
"description": "This policy denies any network security rule that allows management port access from the Internet, by default blocking SSH/RDP ports.",
"metadata": {
"version": "2.1.1",
"category": "Network",
"source": "https://github.com/Azure/Enterprise-Scale/",
"replacesPolicy": "Deny-RDP-From-Internet",
"alzCloudEnvironments": [
"AzureCloud",
"AzureChinaCloud",
"AzureUSGovernment"
]
},
"parameters": {
"effect": {
"type": "String",
"metadata": {
"displayName": "Effect",
"description": "Enable or disable the execution of the policy"
},
"allowedValues": [
"Audit",
"Deny",
"Disabled"
],
"defaultValue": "Deny"
},
"ports": {
"type": "Array",
"metadata": {
"displayName": "Ports",
"description": "Ports to be blocked"
},
"defaultValue": [
"22",
"3389"
]
}
},
"policyRule": {
"if": {
"anyOf": [
{
"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",
"equals": "*"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange",
"in": "[[parameters('ports')]"
},
{
"count": {
"value": "[[parameters('ports')]",
"where": {
"value": "[[if(and(not(empty(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange'))), contains(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange'),'-')), and(lessOrEquals(int(first(split(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange'), '-'))),int(current())),greaterOrEquals(int(last(split(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange'), '-'))),int(current()))), 'false')]",
"equals": "true"
}
},
"greater": 0
},
{
"count": {
"value": "[[parameters('ports')]",
"name": "ports",
"where": {
"count": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
"where": {
"value": "[[if(and(not(empty(current('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]'))), contains(current('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]'),'-')), and(lessOrEquals(int(first(split(current('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]'), '-'))),int(current('ports'))),greaterOrEquals(int(last(split(current('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]'), '-'))),int(current('ports')))) , 'false')]",
"equals": "true"
}
},
"greater": 0
}
},
"greater": 0
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
"notEquals": "*"
}
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
"notIn": "[[parameters('ports')]"
}
}
]
},
{
"anyOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules/sourceAddressPrefix",
"equals": "*"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules/sourceAddressPrefix",
"equals": "Internet"
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules/sourceAddressPrefixes[*]",
"notEquals": "*"
}
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules/sourceAddressPrefixes[*]",
"notEquals": "Internet"
}
}
]
}
]
}
]
},
{
"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",
"equals": "*"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRange",
"in": "[[parameters('ports')]"
},
{
"count": {
"value": "[[parameters('ports')]",
"name": "ports",
"where": {
"value": "[[if(and(not(empty(current('Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRange'))), contains(current('Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRange'),'-')), and(lessOrEquals(int(first(split(current('Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRange'), '-'))),int(current('ports'))),greaterOrEquals(int(last(split(current('Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRange'), '-'))),int(current('ports')))), 'false')]",
"equals": "true"
}
},
"greater": 0
},
{
"count": {
"value": "[[parameters('ports')]",
"name": "ports",
"where": {
"count": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRanges[*]",
"where": {
"value": "[[if(and(not(empty(current('Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRanges[*]'))), contains(current('Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRanges[*]'),'-')), and(lessOrEquals(int(first(split(current('Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRanges[*]'), '-'))),int(current('ports'))),greaterOrEquals(int(last(split(current('Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRanges[*]'), '-'))),int(current('ports')))) , 'false')]",
"equals": "true"
}
},
"greater": 0
}
},
"greater": 0
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRanges[*]",
"notEquals": "*"
}
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].destinationPortRanges[*]",
"notIn": "[[parameters('ports')]"
}
}
]
},
{
"anyOf": [
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].sourceAddressPrefix",
"equals": "*"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].sourceAddressPrefix",
"equals": "Internet"
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].sourceAddressPrefixes[*]",
"notEquals": "*"
}
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules[*].sourceAddressPrefixes[*]",
"notEquals": "Internet"
}
}
]
}
]
}
},
"greater": 0
}
]
}
]
},
"then": {
"effect": "[[parameters('effect')]"
}
}
}
}