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ConvertTo-ArmPolicyYaml.ps1
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ConvertTo-ArmPolicyYaml.ps1
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$policy = Get-AzFirewallPolicy -ResourceGroupName "rg" -name "existing-policy"
$outputPath = ".\Rules"
#region Helper functions
function Expand-ParametersInArrayProperty {
param(
$Items,
$Parameters,
[bool]$ForceEmptyArrayResult = $true,
[bool]$ForceSingleItemArrayResult = $true
)
$output = @()
foreach($item in $Items) {
if($item -match "\[parameters\('([^']+)'\)\]") {
$output += $Parameters.$($Matches[1]).defaultValue
} else {
$output += $item
}
}
if(($output.Length -eq 0 -and $ForceEmptyArrayResult) -or ($output.Length -eq 1 -and $ForceSingleItemArrayResult)) {
Write-Output -NoEnumerate $output # force to return array (even with single item records)
} else {
Write-Output $output
}
}
#endregion
#region Convert Policy
$temp = New-TemporaryFile
Export-AzResourceGroup -ResourceGroupName $policy.ResourceGroupName -Resource $policy.Id -Path $temp.FullName -IncludeParameterDefaultValue
$json = Get-Content "$($temp.FullName).json" | ConvertFrom-Json -Depth 10
Remove-Item -Path "$($temp.FullName).json"
$rcgs = $json.resources | Where-Object type -eq "Microsoft.Network/firewallPolicies/ruleCollectionGroups"
Write-Output "Rule Collections Groups [$($rcgs.Length)]:"
foreach($rcg in $rcgs) {
$parts = ($rcg.name -split "./")
$name = $parts[1].Substring(0, $parts[1].Length - 3)
Write-Output " * $($name) [$($rcg.properties.ruleCollections.Count) rule collections]"
$path = Join-Path $outputPath $name
if(-not(Test-Path -Path $path)) {
$rcgDirectory = New-Item -ItemType Directory -Path $path
} else {
$rcgDirectory = Get-Item -Path $path
}
$metadata = @"
name: $name
priority: $($rcg.properties.priority)
"@
Set-Content -Path (Join-Path $rcgDirectory.FullName "collection.yaml") -Value $metadata
$ruleCollections = $rcg.properties.ruleCollections
foreach($ruleCollection in $ruleCollections) {
$content = [PSCustomObject]@{
name = $ruleCollection.name
priority = $ruleCollection.priority
action = $ruleCollection.action.type
rules = @()
}
Write-Output " + $($ruleCollection.name) with $($ruleCollection.rules.Length) rules"
Write-Output " Rules Count: $($ruleCollection.rules.Length)"
$collectionType = "?"
if($ruleCollection.rules.Length -eq 0) {
Write-Output " [!] $($ruleCollection.name) as does not contain any rule -> guessing type from name"
if($ruleCollection.name -match "Network-Collection$") {
$collectionType = "NetworkRule"
}
if($ruleCollection.name -match "Application-Collection$") {
$collectionType = "ApplicationRule"
}
Write-Warning "Skipping empty rule collection $($ruleCollection.name) from export as Terraform does not support this scenario."
continue # terraform does not support empty rule collection ()
<#
Error: Insufficient rule blocks
│ At least 1 "rule" blocks are required.
#>
} else {
$groups = $ruleCollection.rules | Group-Object -Property ruleType
if($groups.Length -gt 1) {
throw "Unsupported scenario with multiple kinds of items in one rule collection"
}
$group = $groups | Select-Object -First 1
$collectionType = $group.Name
}
Write-Output " Type: $($collectionType)"
$fileNamePrefix = "?"
switch($collectionType)
{
"NetworkRule" { $fileNamePrefix = "network" }
"ApplicationRule" { $fileNamePrefix = "application" }
default {
Write-Host $group.Name
throw "Unsupported firewall rule type $($group.Name)"
}
}
$fileName = "$($fileNamePrefix)_$($ruleCollection.name).yaml"
if($ruleCollection.rules.Length -gt 0) {
foreach($rule in $ruleCollection.rules) {
if($collectionType -eq "NetworkRule") {
$ruleData = @{
name = $rule.name
protocols = Expand-ParametersInArrayProperty -Items $rule.ipProtocols -Parameters $json.parameters -ForceSingleItemArrayResult $false
destination_ports = Expand-ParametersInArrayProperty -Items $rule.destinationPorts -Parameters $json.parameters -ForceSingleItemArrayResult $false
}
if($rule.sourceAddresses.Length -gt 0) {
$ruleData["source_addresses"] = Expand-ParametersInArrayProperty -Items $rule.sourceAddresses -Parameters $json.parameters -ForceSingleItemArrayResult $false
}
if($rule.destinationAddresses.Length -gt 0) {
$ruleData["destination_addresses"] = Expand-ParametersInArrayProperty -Items $rule.destinationAddresses -Parameters $json.parameters -ForceSingleItemArrayResult $false
}
if($rule.destinationFqdns.Length -gt 0) {
$ruleData["destination_fqdns"] = Expand-ParametersInArrayProperty -Items $rule.destinationFqdns -Parameters $json.parameters -ForceSingleItemArrayResult $false
}
if($rule.destinationIpGroups.Length -gt 0) {
$ruleData["destination_ip_groups"] = Expand-ParametersInArrayProperty -Items $rule.destinationIpGroups -Parameters $json.parameters -ForceSingleItemArrayResult $false
}
if($rule.sourceIpGroups.Length -gt 0) {
$ruleData["source_ip_groups"] = Expand-ParametersInArrayProperty -Items $rule.sourceIpGroups -Parameters $json.parameters -ForceSingleItemArrayResult $false
}
$content.rules += [PSCustomObject]$ruleData
}
if($collectionType -eq "ApplicationRule") {
$ruleData = @{
name = $rule.name
protocols = @()
}
if($rule.targetFqdns.Length -gt 0) {
$ruleData["destination_fqdns"] = Expand-ParametersInArrayProperty -Items $rule.targetFqdns -Parameters $json.parameters -ForceSingleItemArrayResult $false
}
if($rule.fqdnTags.Length -gt 0) {
$ruleData["destination_fqdn_tags"] = Expand-ParametersInArrayProperty -Items $rule.fqdnTags -Parameters $json.parameters -ForceSingleItemArrayResult $false
}
if($rule.sourceAddresses.Length -gt 0) {
$ruleData["source_addresses"] = Expand-ParametersInArrayProperty -Items $rule.sourceAddresses -Parameters $json.parameters -ForceSingleItemArrayResult $false
}
if($rule.sourceIpGroups.Length -gt 0) {
$ruleData["source_ip_groups"] = Expand-ParametersInArrayProperty -Items $rule.sourceIpGroups -Parameters $json.parameters -ForceSingleItemArrayResult $false
}
foreach($protocol in $rule.protocols) {
$ruleData.protocols += [PSCustomObject]@{
type = $protocol.protocolType
port = $protocol.port
}
}
$content.rules += [PSCustomObject]$ruleData
}
}
}
$yaml = $content | ConvertTo-Yaml
Set-Content -Value $yaml -Path (Join-Path $rcgDirectory.FullName $fileName)
}
}
#endregion
# generate folder names to paste in terraform definition
Get-ChildItem $outputPath | Select-Object -ExpandProperty Name | ForEach-Object { "`"$($_)`"," } | scb