AzureFwGitOps.psm1
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# Formats JSON in a nicer format than the built-in ConvertTo-Json does. # Thanks to Kody for providing this excellent function (https://stackoverflow.com/users/1754995/kody) # https://stackoverflow.com/questions/57329639/powershell-convert-to-json-is-bad-format/57329852#57329852 function Format-Json([Parameter(Mandatory, ValueFromPipeline)][String] $json) { $indent = 0; ($json -Split '\n' | foreach-object { if ($_ -match '[\}\]]') { # This line contains ] or }, decrement the indentation level $indent-- } $line = (' ' * $indent * 2) + $_.TrimStart().Replace(': ', ': ') if ($_ -match '[\{\[]') { # This line contains [ or {, increment the indentation level $indent++ } $line }) -Join "`n" } Function ConvertFrom-ArmFw { [cmdletbinding()] Param( $ArmFolder, $PolicyFolder, [switch]$Merge, $Delimiter = ',', $Changes ) #Extract all resources from ARM files $resources = @() Get-ChildItem -LiteralPath $ArmFolder -filter *.json | Foreach-Object{ $resources += [array](Get-Content $_.FullName | ConvertFrom-Json).resources } #Process all firewall policies and store in policies object (stored in policySettings.json) $policies = @() $resources | Where-Object {$_.type -eq 'Microsoft.Network/firewallPolicies'} | Foreach-object{ $thisPolicy = $_ $policies += [pscustomobject]@{ "name" = $thisPolicy.name "childPolicies" = @($thisPolicy.properties.childpolicies.id) "linkedRuleCollectionGroups" = @($thisPolicy.properties.ruleCollectionGroups) "ruleCollectionGroups" = @() } } #Process all rule collection groups $ruleCollectionGroups = @() $resources | Where-Object {$_.type -eq 'Microsoft.Network/firewallPolicies/ruleCollectionGroups'} | Foreach-object{ $thisRuleCollGroup = $_ $object = [PSCustomObject]@{ "name" = $thisRuleCollGroup.name "priority" = $thisRuleCollGroup.properties.priority "ruleCollections" = @() } $thisRuleCollGroup.properties.ruleCollections | Foreach-object { $object.ruleCollections += [pscustomobject]@{ "name" = $_.name "priority" = $_.priority "action" = $_.action } } $ruleCollectionGroups += $object } #join ruleCollectionGroups and policies (in order to generate a policySettings.json) $policies | ForEach-Object{ $thisPolicy = $_ $thisRuleCollGroup = $ruleCollectionGroups | Where-Object{$_.name.split('/')[0] -eq $thisPolicy.name} If($thisPolicy.linkedRuleCollectionGroups.id.count -gt 0){ $thisRuleCollGroupId = $thisPolicy.linkedRuleCollectionGroups.id | Where-Object{$_.split('/')[-1] -eq $thisRuleCollGroup.name.Split('/')[-1]} $object = [PSCustomObject]@{ "id" = $thisRuleCollGroupId "name" = $thisRuleCollGroup.name "priority" = $thisRuleCollGroup.priority "ruleCollections" = $thisRuleCollGroup.ruleCollections } $thisPolicy.ruleCollectionGroups = $object } } #Save everything, except linkedRuleCollectionGroups as they are also part of the member ruleCollectionGroups $policies | Select-object -Property * -ExcludeProperty linkedRuleCollectionGroups | ConvertTo-Json -Depth 100 | Format-Json | Tee-Object $PolicyFolder\policySettings.json -Encoding utf8 #Assert folders for firewall and ruleCollGroups $policies | Foreach-Object { $policyName = $_.name New-Item "$PolicyFolder\$policyName" -ItemType Directory -Force Try{ $_.ruleCollectionGroups | Foreach-object{ $ruleCollGroup = $_.name.split('/')[-1] New-Item "$PolicyFolder\$policyName\$ruleCollGroup" -ItemType Directory -Force $_.ruleCollections | Foreach-Object{ New-Item "$PolicyFolder\$policyName\$ruleCollGroup\$($_.name)" -ItemType Directory -Force } } } Catch{} } #Create CSV files, one per folder. $resources | Where-Object {$_.type -eq 'Microsoft.Network/firewallPolicies/ruleCollectionGroups'} | Foreach-object{ $thisRuleCollGroup = $_ $thisRuleCollGroup.properties.ruleCollections | Foreach-Object{ $ruleColl = $_ If($ruleColl.rules.count -ge 1){ $thisCsvFile = "$PolicyFolder\$($thisRuleCollGroup.name)\$($ruleColl.name)\$($ruleColl.rules[0].ruleType).csv" # We sort the output for readability. This might cause issues if apiVersion breaks it. Just use default then. # https://docs.microsoft.com/en-us/azure/templates/microsoft.network/firewallpolicies/rulecollectiongroups?pivots=deployment-language-arm-template#firewallpolicyrule-objects-1 Switch($ruleColl.rules[0].ruleType){ "ApplicationRule"{ $headers = 'name','ruleType','destinationAddresses','fqdnTags','protocols','sourceAddresses','sourceIpGroups','targetFqdns','targetUrls','terminateTLS','webCategories' } "NatRule"{ $headers = 'name','ruleType','destinationAddresses','destinationPorts','ipProtocols','sourceAddresses','sourceIpGroups','translatedAddress','translatedFqdn','translatedPort' } "NetworkRule"{ $headers = 'name','ruleType','destinationAddresses','destinationFqdns','destinationIpGroups','destinationPorts','ipProtocols','sourceAddresses','sourceIpGroups' } Default{ #Auto sorting Write-Warning "No sorting found for type:'$($ruleColl.rules[0].ruleType)'. Applying auto sorting" $headers = 0..($ruleColl.rules.count-1) | Foreach-object{$ruleColl.rules[$_] | get-member -membertype NoteProperty | Select-Object -ExpandProperty Name} | Select-Object -unique | Sort-Object } } #Create headers if merge is false or if the file is new If($Merge -eq $false -or (-not (test-path -Path $thisCsvFile -PathType leaf))){ $headers -join $Delimiter | Tee-Object $thisCsvFile Encoding utf8 } $propertiesExpression = "`"$(($headers | Foreach-object{'$($_.{0})' -f $_}) -join $Delimiter)`"" $ruleColl.rules | Foreach-object{(Invoke-Expression $propertiesExpression)} | Tee-Object $thisCsvFile -append -Encoding utf8 If($Merge -eq $true){ $mergedContent = Get-Content $thisCsvFile | Select-Object -unique $mergedContent | Where-object{$_.Trim()} | Tee-Object $thisCsvFile -Encoding utf8 } If($Changes){ $theseChanges = $Changes | Where-object {$_.type -eq 'rule' -and $_.file -eq "$(Split-Path -Path $policyFolder -leaf)\$($thisRuleCollGroup.name)\$($ruleColl.name)\$($ruleColl.rules[0].ruleType).csv".Replace('\','/')} If($theseChanges){ $headers -join $Delimiter | Tee-Object "removed.csv" -Encoding utf8 $theseChanges.removedRows | Tee-Object "removed.csv" -Append -Encoding utf8 $removedRules = Import-csv "removed.csv" -Delimiter $Delimiter -Encoding utf8 $modifiedContent = Import-csv $thisCsvFile -Delimiter $Delimiter -Encoding utf8 | Where-object{$removedRules.name -notcontains $_.name} Remove-Item "removed.csv" -Force $modifiedContent | ConvertTo-Csv -NoTypeInformation -Delimiter $Delimiter | Foreach-object {$_ -replace '"',''} | Tee-Object $thisCsvFile -Encoding utf8 } } } } } } Function ConvertTo-ArmFw { [cmdletbinding()] Param( $ArmFolder, $PolicyFolder, $fwPolicyFileFormat = 'microsoft.network_firewallpolicies-{0}.json', $fwRuleCollGroupFileFormat = 'microsoft.network_firewallpolicies_rulecollectiongroups-{0}_{1}.json', $Changes, $Delimiter = ',' ) #Read all policy files $settings = Get-Item -LiteralPath "$PolicyFolder\policySettings.json" | Get-Content | ConvertFrom-Json #Get all files in firewall folder $rgFiles = Get-ChildItem -LiteralPath $ArmFolder #Write settings to ARM Templates $settings | ForEach-Object{ $thisFwPolicy = $_ $fwPolicyFile = $fwPolicyFileFormat -f $thisFwPolicy.name #Write fwPolicy files #Create new files if none exist If(-not($rgFiles.Name -contains $fwPolicyFile)){ Throw "$($thisFwPolicy.name) does not match any ARM template.`r`nThis script can't handle creation of new ARM files for Azure Firewall policies (yet).`r`nPlease create a PR on https://github.com/Freakling/AzureFW-GitOps to fix this." } #Write settings and rules files $thisFwPolicy.ruleCollectionGroups | Foreach-Object{ $thisRuleCollGroup = $_ $ruleCollGroupFile = $fwRuleCollGroupFileFormat -f $thisFwPolicy.name,$($thisruleCollGroup.name.split('/')[-1]) #Create new files if none exist If(-not($rgFiles.Name -contains $ruleCollGroupFile)){ Throw "$($thisRuleCollGroup.name) does not match any ARM template.`r`nThis script can't handle creation of new ARM files for Azure FirewallPolicy RuleCollections (yet).`r`nPlease create a PR on https://github.com/Freakling/AzureFW-GitOps to fix this." } $ruleCollGroupData = Get-content "$ArmFolder\$ruleCollGroupFile" | ConvertFrom-Json $thisArmResource = $ruleCollGroupData.resources | Where-object {$_.name -eq $thisRuleCollGroup.name} #set rule coll group priority If($changes | Where-Object {$_.type -eq 'settings'}){ $thisArmResource.properties.priority = (($changes.innerData | Where-Object{$_.name -eq $thisFwPolicy.name}).ruleCollectionGroups | Where-object{$_.name -eq $thisRuleCollGroup.name}).priority } else { $thisArmResource.properties.priority = $thisRuleCollGroup.priority } #process each rule coll and write them to arm code # https://learn.microsoft.com/en-us/azure/templates/microsoft.network/firewallpolicies/rulecollectiongroups?pivots=deployment-language-arm-template $thisRuleCollGroup.ruleCollections | Foreach-Object{ $thisRuleColl = $_ $thisArmRuleColl = $thisArmResource.properties.ruleCollections | Where-Object{$_.name -eq $thisRuleColl.name} #If no ruleCollection exists then If(-not($thisArmRuleColl)){ Throw "This script can't create ruleCollections yet. Create a blank rulecoll until this is fixed. Please create a PR on https://github.com/Freakling/AzureFW-GitOps to fix this." } #write settings to rulecoll If($changes | Where-Object {$_.type -eq 'settings'}){ $thisArmRuleColl.priority = ((($changes.innerData | Where-Object{$_.name -eq $thisFwPolicy.name}).ruleCollectionGroups | Where-object{$_.name -eq $thisRuleCollGroup.name}).ruleCollections | Where-object{$_.name -eq $thisRuleColl.name}).priority $thisArmRuleColl.action = ((($changes.innerData | Where-Object{$_.name -eq $thisFwPolicy.name}).ruleCollectionGroups | Where-object{$_.name -eq $thisRuleCollGroup.name}).ruleCollections | Where-object{$_.name -eq $thisRuleColl.name}).action } else { $thisArmRuleColl.priority = $thisRuleColl.priority $thisArmRuleColl.action = $thisRuleColl.action } #read rules from csv $csvFiles = Get-ChildItem "$policyFolder/$($thisRulecollGroup.name)/$($thisRuleColl.name)" $theseRules = @() #set all rules $csvFiles | Foreach-object{ $rules = Import-csv -LiteralPath $_.FullName -Delimiter $Delimiter -Encoding utf8 #Need to make sure these are correct datatype # https://learn.microsoft.com/en-us/azure/templates/microsoft.network/firewallpolicies/rulecollectiongroups?pivots=deployment-language-arm-template $rules | ForEach-Object { $rule = $_ switch($rule.ruleType){ "ApplicationRule"{ [array]$rule.destinationAddresses = $rule.destinationAddresses [array]$rule.fqdnTags = $rule.fqdnTags [array]$rule.protocols = $rule.protocols [array]$rule.sourceAddresses = $rule.sourceAddresses [array]$rule.sourceIpGroups = $rule.sourceIpGroups [array]$rule.targetFqdns = $rule.targetFqdns [array]$rule.targetUrls = $rule.targetUrls [array]$rule.webCategories = $rule.webCategories #transform this object to a true array of objects $protocols = @() $rule.protocols | Foreach-object { $thisRow = [pscustomobject]@{} $data = $_.split(';') $data | Foreach-Object { $cleaned = $_.TrimStart('@{').TrimEnd('}').Trim() $thisRow | Add-Member -Type NoteProperty -Name $cleaned.split('=')[0] -Value $cleaned.split('=')[1] } $protocols += $thisRow } $rule.protocols = $protocols } "NatRule"{ [array]$rule.destinationAddresses = $rule.destinationAddresses.split(' ') [array]$rule.destinationPorts = $rule.destinationPorts.split(' ') [array]$rule.ipProtocols = $rule.ipProtocols.split(' ') [array]$rule.sourceAddresses = $rule.sourceAddresses.split(' ') [array]$rule.sourceIpGroups = $rule.sourceIpGroups.split(' ') } "NetworkRule"{ [array]$rule.destinationAddresses = $rule.destinationAddresses.split(' ') [array]$rule.destinationFqdns = $rule.destinationFqdns.split(' ') [array]$rule.destinationIpGroups = $rule.destinationIpGroups.split(' ') [array]$rule.destinationPorts = $rule.destinationPorts.split(' ') [array]$rule.ipProtocols = $rule.ipProtocols.split(' ') [array]$rule.sourceAddresses = $rule.sourceAddresses.split(' ') [array]$rule.sourceIpGroups = $rule.sourceIpGroups.split(' ') } default{} } } $theseRules += $rules } $thisArmRuleColl.rules = $theseRules } #write new settings to arm template ($ruleCollGroupData | ConvertTo-Json -Depth 100).replace('""','') | Format-Json | Tee-Object "$ArmFolder\$ruleCollGroupFile" -Encoding utf8 } } } |