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Convert NSG data in CSV to ARM templates

Note

The below script was developed by Nills Franssens https://github.com/NillsF/NSG-CSV-to-ARM

A powershell script to convert CSV file to ARM template for NSG automation. The script itself takes in a CSV file (see example rules.csv for an example) and creates ARM templates as an output. The solution does not do the actual deployment, but does a test of the deployment. This requires you to be logged in to Azure prior to executing the script.

How to use

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#First login to Azure powershell
Login-AzureRMAccount
#Execute script
convert-csvtoarm.ps1 -filename rules.csv

rules.csv

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Network rules,direction,Rule Priority,Rule_Name,Access,Protocol,Source,Destination,port,Description
private,inbound,100,deny_Telnet-23,deny,*,*,*,23,Block telnet
private,inbound,101,allow_ssh,allow,*,*,*,22,Allow SSH
private,inbound,4000,deny_rdp,allow,*,*,*,3389,No outbound internet
public,inbound,4096,deny_all,deny,*,*,*,*,Foundation

convert-csvtoarm.ps1

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param(
  [Parameter(Mandatory = $true)]
  [String]$filename
)

Write-Host -Object $env:BUILD_SOURCESDIRECTORY
$fileindir = "$env:BUILD_SOURCESDIRECTORY\$filename"
$rules = Get-Content $fileindir
$rules = ConvertFrom-Csv -InputObject $rules -Delimiter ','
$zones = @()

foreach ($rule in $rules)
{
  if($zones -contains ($rule.'Network rules'))
  {

  }
  else 
  {
    $zones += ($rule.'Network rules')
  }
}
Write-Host -Object $zones

foreach($zone in $zones)
{
  $zonerules = @()
  foreach ($rule in $rules)
  {
    if($rule.'Network rules' -eq $zone)
    {
      $rule.source = ($rule.source.Trim().split(';') | ConvertTo-Json)
      $rule.Destination = ($rule.Destination.Trim().split(';') | ConvertTo-Json)
      $rule.port = ($rule.port.Trim().split(';') | ConvertTo-Json)
      $zonerules += $rule
    }
  }

  $rulesfiles = $zonerules
  $environment = $zone

  $inboundrules = @()
  foreach($rule in $rulesfiles)
  {
    if($rule.direction -eq 'inbound')
    {
      $inboundrules += $rule
    }
  }

  $outboundrules = @()
  foreach($rule in $rulesfiles)
  {
    if($rule.direction -eq 'outbound')
    {
      $outboundrules += $rule
    }
  }

  $arm = '{
    "$schema": "http://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {  },
    "variables": {  },
    "resources": [ {
    "apiVersion": "2017-06-01",
    "type": "Microsoft.Network/networkSecurityGroups",
  "name": "' + $environment +'-nsg",
    "location": "[resourceGroup().location]",
    "properties": {
    "securityRules": [

  '
  foreach($rule in $inboundrules)
  {
    $sourceprefix = '""'
    $sourceprefixes = '""'
    if($rule.Source.Contains('['))
    {
      $sourceprefixes = $rule.Source
    }
    else 
    {
      $sourceprefix = $rule.Source
    }

    $destinationprefix = '""'
    $destinationprefixes = '""'
    if($rule.destination.Contains('['))
    {
      $destinationprefixes = $rule.destination
    }
    else 
    {
      $destinationprefix = $rule.destination
    }


    $jsonrule = "{
      ""name"": ""IN-$($rule.'Rule_Name')"",
      ""properties"": {
      ""description"": ""$($rule.Description)"",
      ""protocol"": ""$($rule.Protocol)"",
      ""sourcePortRange"": ""*"",
      ""destinationPortRange"": $($rule.port),
      ""sourceAddressPrefixes"": $($sourceprefixes),
      ""destinationAddressPrefixes"": $($destinationprefixes),
      ""sourceAddressPrefix"": $($sourceprefix),
      ""destinationAddressPrefix"": $($destinationprefix),
      ""access"": ""$($rule.Access)"",
      ""priority"": $($rule.'Rule Priority'),
      ""direction"": ""$($rule.Direction)""
      }
    },"
    $arm += $jsonrule
  }
  foreach($rule in $outboundrules)
  {
    $sourceprefix = '""'
    $sourceprefixes = '""'
    if($rule.Source.Contains('['))
    {
      $sourceprefixes = $rule.Source
    }
    else 
    {
      $sourceprefix = $rule.Source
    }

    $destinationprefix = '""'
    $destinationprefixes = '""'
    if($rule.destination.Contains('['))
    {
      $destinationprefixes = $rule.destination
    }
    else 
    {
      $destinationprefix = $rule.destination
    }

    $jsonrule = "{
      ""name"": ""OUT-$($rule.'Rule_Name')"",
      ""properties"": {
      ""description"": ""$($rule.'Rule_Name')"",
      ""protocol"": ""$($rule.Protocol)"",
      ""sourcePortRange"": ""*"",
      ""destinationPortRange"": $($rule.port),
      ""sourceAddressPrefixes"": $($sourceprefixes),
      ""destinationAddressPrefixes"": $($destinationprefixes),
      ""sourceAddressPrefix"": $($sourceprefix),
      ""destinationAddressPrefix"": $($destinationprefix),
      ""access"": ""$($rule.Access)"",
      ""priority"": $($rule.'Rule Priority'),
      ""direction"": ""$($rule.Direction)""
      }
    },"
    $arm += $jsonrule
  }

  $arm = $arm.Substring(0,$arm.Length-1)


  $arm += '      ]
    }   
    }     ],
    "outputs": {  }
  }            '
  $filename = $env:BUILD_SOURCESDIRECTORY+'\'+$environment+'_template.json'
  $arm | Out-File $filename
}


foreach($zone in $zones)
{
  $deploymentname = "nsgdeployment_$zone"
  $filename = "$env:BUILD_SOURCESDIRECTORY\$($zone)_template.json"
  $output = Test-AzureRmResourceGroupDeployment -TemplateFile $filename -ResourceGroupName network-security
  if ($output)
  {
    $o = New-AzureRmResourceGroupDeployment -TemplateFile $filename -ResourceGroupName network-security        -Verbose
    $o
    $o.Details
    throw $0.Details
  }
}