Separate firewall configuration between linked OUs
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@ -1,3 +1,6 @@
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Name: 'COMP: Firewall (Clients)'
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LinkedOUs:
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- OU=Clients,OU=Computer accounts
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FirewallRules:
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- Description: Rule A
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Action: Block
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@ -0,0 +1,65 @@
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Name: 'COMP: Firewall (DomainControllers)'
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LinkedOUs:
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- OU=Domain Controllers
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FirewallRules:
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- Description: Rule A
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Action: Block
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Direction: Inbound
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Program: ''
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Port: '21-22,25'
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Protocol: TCP
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- Description: Rule B
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Action: Allow
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Direction: Inbound
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Program: D:\MSSQL\sqlsvr.exe
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Port: ''
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Protocol: ''
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FirewallProfiles:
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- Name: Domain
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Enabled: 'True'
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Connections:
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Inbound: Block
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Outbound: Allow
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Settings:
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DisplayNotification: 'False'
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ApplyLocalFirewallRules: 'True'
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ApplyLocalConnectionSecurityRules: 'True'
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Logging:
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Name: '%SYSTEMROOT%\System32\Logfiles\Firewall\domainfw.log'
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SizeLimit: 16384
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LogDroppedPackets: 'True'
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LogSuccessfullConnections: 'False'
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- Name: Private
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Enabled: 'True'
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Connections:
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Inbound: Block
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Outbound: Allow
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Settings:
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DisplayNotification: 'False'
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ApplyLocalFirewallRules: 'True'
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ApplyLocalConnectionSecurityRules: 'True'
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Logging:
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Name: '%SYSTEMROOT%\System32\Logfiles\Firewall\privatefw.log'
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SizeLimit: 16384
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LogDroppedPackets: 'True'
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LogSuccessfullConnections: 'False'
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- Name: Public
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Enabled: 'True'
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Connections:
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Inbound: Block
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Outbound: Allow
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Settings:
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DisplayNotification: 'False'
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ApplyLocalFirewallRules: 'True'
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ApplyLocalConnectionSecurityRules: 'True'
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Logging:
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Name: '%SYSTEMROOT%\System32\Logfiles\Firewall\publicfw.log'
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SizeLimit: 16384
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LogDroppedPackets: 'True'
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LogSuccessfullConnections: 'False'
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# ---
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# Variables:
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# - Name: foo
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# Expression: |
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# Write-Host 'bar'
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@ -6,104 +6,135 @@ Param(
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# Only executed on primary or standalone Domain Controller
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If (@('primary','standalone') -contains $Parameter['deployment.type']) {
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$GetContentSplat = @{
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$GetItemSplat = @{
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Path = "$($PSScriptRoot)\$($MyInvocation.MyCommand)".Replace('.ps1', '.yml')
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Raw = $true
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}
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$RawContent = Get-Content @GetContentSplat
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$ConvertFromYamlSplat = @{
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Yaml = $RawContent
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AllDocuments = $True
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}
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$YamlDocuments = ConvertFrom-Yaml @ConvertFromYamlSplat
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# Check if the respective .yml file declared substitutions which need to be parsed
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If (($YamlDocuments.Count -gt 1) -and $YamlDocuments[-1].Variables) {
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ForEach ($Pattern in $YamlDocuments[-1].Variables) {
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$RawContent = $RawContent -replace "\{\{ ($($Pattern.Name)) \}\}", [string](Invoke-Expression -Command $Pattern.Expression)
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ForEach ($File in (Get-Item @GetItemSplat)) {
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Try {
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Write-Host "Loading/parsing file '$($File)' ..."
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$GetContentSplat = @{
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Path = $File
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Raw = $True
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}
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$RawContent = Get-Content @GetContentSplat
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$ConvertFromYamlSplat = @{
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Yaml = $RawContent
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AllDocuments = $True
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}
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$YamlDocuments = ConvertFrom-Yaml @ConvertFromYamlSplat
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}
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# Perform conversion to Yaml again, now with parsed file contents
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$ConvertFromYamlSplat = @{
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Yaml = $RawContent
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AllDocuments = $True
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Catch {
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$ParseErrors += "While processing '$($File)': $($_.Exception.Message)"
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Continue
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}
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$YamlDocuments = ConvertFrom-Yaml @ConvertFromYamlSplat
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$Settings = $YamlDocuments[0..($YamlDocuments.Count - 2)]
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}
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Else {
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$Settings = $YamlDocuments
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}
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# Check if the respective .yml file declared substitutions which need to be parsed
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If (($YamlDocuments.Count -gt 1) -and $YamlDocuments[-1].Variables) {
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Try {
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ForEach ($Pattern in $YamlDocuments[-1].Variables) {
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$RawContent = $RawContent -replace "\{\{ ($($Pattern.Name)) \}\}", [string](Invoke-Expression -Command $Pattern.Expression)
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}
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# Perform conversion to Yaml again, now with parsed file contents
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$ConvertFromYamlSplat = @{
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Yaml = $RawContent
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AllDocuments = $True
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}
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$YamlDocuments = ConvertFrom-Yaml @ConvertFromYamlSplat
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}
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Catch {
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$ParseErrors += "While processing '$($File)' (after substitutions): $($_.Exception.Message)"
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Continue
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}
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$NewGPOSplat = @{
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Name = 'COMP: Firewall (Servers)'
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}
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$NewGPO = New-GPO @NewGPOSplat
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$OpenNetGPOSplat = @{
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PolicyStore = "$($Parameter['addsconfig.domainname'])\$($NewGPO.DisplayName)"
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}
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$GPOSession = Open-NetGPO @OpenNetGPOSplat
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ForEach ($Rule in $Settings.FirewallRules) {
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$NewNetFirewallRuleSplat = @{
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# Using so-called string formatting with the '-f' operator (looks more complicated than it is) to create consistent policy names:
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# Examples:
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# 'DENY: Inbound port 443 (TCP)'
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# 'ALLOW: Inbound 'D:\MSSQL\bin\sqlservr.exe'
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DisplayName = ("{0}: {1} {2} {3} {4}" -f
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$Rule.Action.ToUpper(),
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$Rule.Direction,
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("'$($Rule.Program)'", $NULL)[!($Rule.Program)],
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("Port $($Rule.Port)", $NULL)[!($Rule.Port)],
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("($($Rule.Protocol))", $NULL)[!($Rule.Protocol)]
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) -replace '\s+',' '
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Description = $Rule.Description
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Action = $Rule.Action
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Direction = $Rule.Direction
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Program = ($Rule.Program, 'Any')[!($Rule.Program)]
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LocalPort = ($Rule.Port.Split(','), 'Any')[!($Rule.Port)]
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Protocol = ($Rule.Protocol, 'Any')[!($Rule.Protocol)]
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GPOSession = $GPOSession
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PolicyStore = $NewGPO.DisplayName
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Confirm = $False
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$Settings = $YamlDocuments[0..($YamlDocuments.Count - 2)]
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}
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New-NetFirewallRule @NewNetFirewallRuleSplat
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}
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ForEach ($Profile in $Settings.FirewallProfiles) {
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$SetNetFirewallProfileSplat = @{
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Name = $Profile.Name
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Enabled = $Profile.Enabled
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DefaultInboundAction = $Profile.Connections.Inbound
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DefaultOutboundAction = $Profile.Connections.Outbound
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LogAllowed = $Profile.Logging.LogSuccessfullConnections
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LogBlocked = $Profile.Logging.LogDroppedPackets
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LogFileName = $Profile.Logging.Name
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LogMaxSizeKilobytes = $Profile.Logging.SizeLimit
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AllowLocalFirewallRules = $Profile.Settings.ApplyLocalFirewallRules
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AllowLocalIPsecRules = $Profile.Settings.ApplyLocalConnectionSecurityRules
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NotifyOnListen = $Profile.Settings.DisplayNotification
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GPOSession = $GPOSession
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PolicyStore = $NewGPO.DisplayName
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Confirm = $False
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Else {
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$Settings = $YamlDocuments
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}
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$NewGPOSplat = @{
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Name = $Settings.Name
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}
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$NewGPO = New-GPO @NewGPOSplat
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$OpenNetGPOSplat = @{
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PolicyStore = "$($Parameter['addsconfig.domainname'])\$($NewGPO.DisplayName)"
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}
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$GPOSession = Open-NetGPO @OpenNetGPOSplat
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ForEach ($Rule in $Settings.FirewallRules) {
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$NewNetFirewallRuleSplat = @{
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# Using so-called string formatting with the '-f' operator (looks more complicated than it is) to create consistent policy names:
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# Examples:
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# 'DENY: Inbound port 443 (TCP)'
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# 'ALLOW: Inbound 'D:\MSSQL\bin\sqlservr.exe'
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DisplayName = ("{0}: {1} {2} {3} {4}" -f
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$Rule.Action.ToUpper(),
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$Rule.Direction,
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("'$($Rule.Program)'", $NULL)[!($Rule.Program)],
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("Port $($Rule.Port)", $NULL)[!($Rule.Port)],
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("($($Rule.Protocol))", $NULL)[!($Rule.Protocol)]
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) -replace '\s+',' '
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Description = $Rule.Description
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Action = $Rule.Action
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Direction = $Rule.Direction
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Program = ($Rule.Program, 'Any')[!($Rule.Program)]
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LocalPort = ($Rule.Port.Split(','), 'Any')[!($Rule.Port)]
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Protocol = ($Rule.Protocol, 'Any')[!($Rule.Protocol)]
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GPOSession = $GPOSession
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PolicyStore = $NewGPO.DisplayName
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Confirm = $False
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}
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New-NetFirewallRule @NewNetFirewallRuleSplat
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}
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ForEach ($Profile in $Settings.FirewallProfiles) {
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$SetNetFirewallProfileSplat = @{
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Name = $Profile.Name
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Enabled = $Profile.Enabled
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DefaultInboundAction = $Profile.Connections.Inbound
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DefaultOutboundAction = $Profile.Connections.Outbound
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LogAllowed = $Profile.Logging.LogSuccessfullConnections
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LogBlocked = $Profile.Logging.LogDroppedPackets
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LogFileName = $Profile.Logging.Name
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LogMaxSizeKilobytes = $Profile.Logging.SizeLimit
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AllowLocalFirewallRules = $Profile.Settings.ApplyLocalFirewallRules
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AllowLocalIPsecRules = $Profile.Settings.ApplyLocalConnectionSecurityRules
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NotifyOnListen = $Profile.Settings.DisplayNotification
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GPOSession = $GPOSession
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PolicyStore = $NewGPO.DisplayName
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Confirm = $False
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}
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Set-NetFirewallProfile @SetNetFirewallProfileSplat
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}
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$SaveNetGPOSplat = @{
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GPOSession = $GPOSession
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}
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Save-NetGPO @SaveNetGPOSplat
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ForEach ($OU in $Settings.LinkedOUs) {
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If (Test-Path "AD:\$($OU + (',{0}' -f (Get-ADRootDSE).rootDomainNamingContext))") {
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Try {
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Write-Host "Linking policy '$($NewGPO.DisplayName)' to OU '$($OU)' ..."
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$NewGPLinkSplat = @{
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Name = $NewGPO.DisplayName
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Target = $OU + (',{0}' -f (Get-ADRootDSE).rootDomainNamingContext)
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}
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New-GPLink @NewGPLinkSplat | Out-Null
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}
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Catch {
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$ParseErrors += "Could not link GPO '$($NewGPO.DisplayName)' to OU '$($OU)'"
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Continue
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}
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}
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Else {
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$ParseErrors += "Path not accessible (referred to by '$($NewGPO.DisplayName)'): 'AD:\$($OU + (',{0}' -f (Get-ADRootDSE).rootDomainNamingContext))'"
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Continue
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}
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}
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Set-NetFirewallProfile @SetNetFirewallProfileSplat
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}
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$SaveNetGPOSplat = @{
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GPOSession = $GPOSession
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If ($ParseErrors) {
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Throw "One or more errors occurred:`n$($ParseErrors -join "`n")"
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}
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Save-NetGPO @SaveNetGPOSplat
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$NewGPLinkSplat = @{
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Name = $NewGPO.DisplayName
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# Should probably be configurable through yml
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Target = 'OU=Servers,OU=Computer accounts,DC=' + $Parameter['addsconfig.domainname'].Replace('.', ',DC=')
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}
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New-GPLink @NewGPLinkSplat
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$NewGPLinkSplat = @{
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Name = $NewGPO.DisplayName
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Target = 'OU=Domain Controllers,DC=' + $Parameter['addsconfig.domainname'].Replace('.', ',DC=')
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}
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New-GPLink @NewGPLinkSplat
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}
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@ -0,0 +1,65 @@
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Name: 'COMP: Firewall (Servers)'
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LinkedOUs:
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- OU=Servers,OU=Computer accounts
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FirewallRules:
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- Description: Rule A
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Action: Block
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Direction: Inbound
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Program: ''
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Port: '21-22,25'
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Protocol: TCP
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- Description: Rule B
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Action: Allow
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Direction: Inbound
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Program: D:\MSSQL\sqlsvr.exe
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Port: ''
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Protocol: ''
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FirewallProfiles:
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- Name: Domain
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Enabled: 'True'
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Connections:
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Inbound: Block
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Outbound: Allow
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Settings:
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DisplayNotification: 'False'
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ApplyLocalFirewallRules: 'True'
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ApplyLocalConnectionSecurityRules: 'True'
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Logging:
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Name: '%SYSTEMROOT%\System32\Logfiles\Firewall\domainfw.log'
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SizeLimit: 16384
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LogDroppedPackets: 'True'
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LogSuccessfullConnections: 'False'
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- Name: Private
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Enabled: 'True'
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Connections:
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Inbound: Block
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Outbound: Allow
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Settings:
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DisplayNotification: 'False'
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ApplyLocalFirewallRules: 'True'
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ApplyLocalConnectionSecurityRules: 'True'
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Logging:
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Name: '%SYSTEMROOT%\System32\Logfiles\Firewall\privatefw.log'
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SizeLimit: 16384
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LogDroppedPackets: 'True'
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LogSuccessfullConnections: 'False'
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- Name: Public
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Enabled: 'True'
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Connections:
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Inbound: Block
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Outbound: Allow
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Settings:
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DisplayNotification: 'False'
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ApplyLocalFirewallRules: 'True'
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ApplyLocalConnectionSecurityRules: 'True'
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Logging:
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Name: '%SYSTEMROOT%\System32\Logfiles\Firewall\publicfw.log'
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SizeLimit: 16384
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LogDroppedPackets: 'True'
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LogSuccessfullConnections: 'False'
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# ---
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# Variables:
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# - Name: foo
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# Expression: |
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# Write-Host 'bar'
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