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Policy Rule
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{
"properties": {
"displayName": "SSH access from the Internet should be blocked",
"policyType": "BuiltIn",
"mode": "All",
"description": "This policy audits any network security rule that allows SSH access from Internet",
"metadata": {
"version": "2.0.0",
"category": "Network"
},
"parameters": {
"effect": {
"type": "String",
"metadata": {
"displayName": "Effect",
"description": "Enable or disable the execution of the policy"
},
"allowedValues": [
"Audit",
"Disabled"
],
"defaultValue": "Audit"
}
},
"policyRule": {
"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",
"equals": "*"
},
{
"field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange",
"equals": "22"
},
{
"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'), '-'))),22),greaterOrEquals(int(last(split(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRange'), '-'))),22)), 'false')]",
"equals": "true"
},
{
"count": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
"where": {
"value": "[if(and(not(empty(first(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]')))), contains(first(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]')),'-')), and(lessOrEquals(int(first(split(first(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]')), '-'))),22),greaterOrEquals(int(last(split(first(field('Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]')), '-'))),22)) , 'false')]",
"equals": "true"
}
},
"greater": 0
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
"notEquals": "*"
}
},
{
"not": {
"field": "Microsoft.Network/networkSecurityGroups/securityRules/destinationPortRanges[*]",
"notEquals": "22"
}
}
]
},
{
"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"
}
}
]
}
]
}
]
},
"then": {
"effect": "[parameters('effect')]"
}
}
},
"id": "/providers/Microsoft.Authorization/policyDefinitions/2c89a2e5-7285-40fe-afe0-ae8654b92fab",
"type": "Microsoft.Authorization/policyDefinitions",
"name": "2c89a2e5-7285-40fe-afe0-ae8654b92fab"
}
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