Update

.github/FUNDING.yml

@@ -1,7 +1,4 @@
 # These are supported funding model platforms
 
 github: PrzemyslawKlys
-patreon: przemyslawklys
-ko_fi: przemyslawklys
-open_collective: evotec
 custom: https://paypal.me/PrzemyslawKlys

Examples/Example-14-ListingGPOsPerOU3.ps1

@@ -1,5 +1,5 @@
 Import-Module "$PSScriptRoot\..\GPoZaurr.psd1" -Force
 
-Get-ADOrganizationalUnit -Filter * -Properties distinguishedName, LinkedGroupPolicyObjects | Get-GPOZaurrLink | Format-Table
-Get-ADObject -Filter * -Properties distinguishedName, gplink -Server 'ad.evotec.pl' | Get-GPOZaurrLink | Format-Table -AutoSize
+#Get-ADOrganizationalUnit -Filter * -Properties distinguishedName, LinkedGroupPolicyObjects | Get-GPOZaurrLink | Format-Table
+#Get-ADObject -Filter * -Properties distinguishedName, gplink -Server 'ad.evotec.pl' | Get-GPOZaurrLink | Format-Table -AutoSize
 Get-GPOZaurrLink | Format-Table -AutoSize

Examples/Example-14-ListingGPOsPerOU4.ps1

@@ -1,3 +1,3 @@
 Import-Module "$PSScriptRoot\..\GPoZaurr.psd1" -Force
 
-Get-GPOZaurrLink -Linked 'Root' -IncludeDomains 'ad.evotec.pl' | ft
+Get-GPOZaurrLink -Linked 'Root' -IncludeDomains 'ad.evotec.pl' | Format-Table

Examples/Example-14-ListingGPOsPerOURemoveDuplicates.ps1

@@ -0,0 +1,5 @@
+Import-Module "$PSScriptRoot\..\GPoZaurr.psd1" -Force
+
+Get-GPOZaurrLink -SearchBase "OU=ITR01,DC=ad,DC=evotec,DC=xyz" -Verbose | Format-Table -a *
+
+Get-GPOZaurrLink -SearchBase "OU=ITR01,DC=ad,DC=evotec,DC=xyz" -SkipDuplicates | Format-Table -a *

Examples/Example-16-KeepPermissions02.ps1

@@ -6,7 +6,7 @@ Invoke-GPOZaurrPermission -Verbose -Linked Root -IncludeDomains 'ad.evotec.pl' {
     Remove-GPOPermission -Type NotAdministrative, NotWellKnownAdministrative -IncludePermissionType GpoEdit, GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type Administrative -IncludePermissionType GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type AuthenticatedUsers -IncludePermissionType GpoRead -PermitType Allow
-} -WhatIf
+} -WhatIf -SkipDuplicates
 
 
 # Apply perrmissions for Domain Controllers
@@ -15,7 +15,7 @@ Invoke-GPOZaurrPermission -Verbose -Linked DomainControllers -IncludeDomains 'ad
     Remove-GPOPermission -Type NotAdministrative, NotWellKnownAdministrative -IncludePermissionType GpoEdit, GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type Administrative -IncludePermissionType GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type AuthenticatedUsers -IncludePermissionType GpoRead -PermitType Allow
-} -WhatIf
+} -WhatIf -SkipDuplicates
 
 # Apply permissions for Regions, with exclusions for those 4 groups
 $Exclude = @(
@@ -27,7 +27,8 @@ Invoke-GPOZaurrPermission -Verbose -SearchBase 'OU=ITR01,DC=ad,DC=evotec,DC=xyz'
     Remove-GPOPermission -Type NotAdministrative, NotWellKnownAdministrative -IncludePermissionType GpoEdit, GpoEditDeleteModifySecurity -PermitType Allow -ExcludePrincipal $Exclude -ExcludePrincipalType DistinguishedName
     Add-GPOPermission -Type Administrative -IncludePermissionType GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type AuthenticatedUsers -IncludePermissionType GpoRead -PermitType Allow
-} #-WhatIf
+} -WhatIf -SkipDuplicates
+
 
 $Exclude = @(
     'CN=ITR02_AD Admins,OU=Security,OU=Groups,OU=Production,DC=ad,DC=evotec,DC=xyz'
@@ -40,4 +41,4 @@ Invoke-GPOZaurrPermission -Verbose -SearchBase 'OU=ITR02,DC=ad,DC=evotec,DC=xyz'
     Remove-GPOPermission -Type NotAdministrative, NotWellKnownAdministrative -IncludePermissionType GpoEdit, GpoEditDeleteModifySecurity -PermitType Allow -ExcludePrincipal $Exclude -ExcludePrincipalType DistinguishedName
     Add-GPOPermission -Type Administrative -IncludePermissionType GpoEditDeleteModifySecurity -PermitType Allow
     Add-GPOPermission -Type AuthenticatedUsers -IncludePermissionType GpoRead -PermitType Allow
-} #-WhatIf
+} -WhatIf -SkipDuplicates

GPOZaurr.psd1

@@ -7,7 +7,7 @@
     Description          = 'Group Policy Eater'
     FunctionsToExport    = 'Add-GPOPermission', 'Add-GPOZaurrPermission', 'Backup-GPOZaurr', 'Get-GPOZaurr', 'Get-GPOZaurrAD', 'Get-GPOZaurrBackupInformation', 'Get-GPOZaurrLegacyFiles', 'Get-GPOZaurrLink', 'Get-GPOZaurrLinkSummary', 'Get-GPOZaurrOwner', 'Get-GPOZaurrPassword', 'Get-GPOZaurrPermission', 'Get-GPOZaurrPermissionConsistency', 'Get-GPOZaurrSysvol', 'Get-WMIFilter', 'Get-GPOZaurrWMI', 'Invoke-GPOZaurrPermission', 'New-GPOZaurrWMI', 'Remove-GPOPermission', 'Remove-GPOZaurr', 'Remove-GPOZaurrLegacyFiles', 'Remove-GPOZaurrOrphanedSysvolFolders', 'Remove-GPOZaurrPermission', 'Remove-GPOZaurrWMI', 'Repair-GPOZaurrPermissionConsistency', 'Restore-GPOZaurr', 'Save-GPOZaurrFiles', 'Set-GPOOwner', 'Set-GPOZaurrOwner'
     GUID                 = 'f7d4c9e4-0298-4f51-ad77-e8e3febebbde'
-    ModuleVersion        = '0.0.39'
+    ModuleVersion        = '0.0.41'
     PowerShellVersion    = '5.1'
     PrivateData          = @{
         PSData = @{

Public/Get-GPOZaurrLink.ps1

@@ -14,6 +14,11 @@
         [parameter(ParameterSetName = 'Linked')]
         [switch] $Limited,
 
+        [parameter(ParameterSetName = 'Filter')]
+        [parameter(ParameterSetName = 'ADObject')]
+        [parameter(ParameterSetName = 'Linked')]
+        [switch] $SkipDuplicates,
+
         [parameter(ParameterSetName = 'Filter')]
         [parameter(ParameterSetName = 'ADObject')]
         [parameter(ParameterSetName = 'Linked')]
@@ -40,6 +45,7 @@
         [System.Collections.IDictionary] $ExtendedForestInformation
     )
     Begin {
+        $CacheReturnedGPOs = [ordered] @{}
         $ForestInformation = Get-WinADForestDetails -Extended -Forest $Forest -IncludeDomains $IncludeDomains -ExcludeDomains $ExcludeDomains -ExtendedForestInformation $ExtendedForestInformation
         if (-not $GPOCache -and -not $Limited) {
             $GPOCache = @{ }
@@ -71,8 +77,20 @@
                         #}
                         $Splat['Filter'] = "(objectClass -eq 'organizationalUnit')"
                         $Splat['SearchBase'] = $SearchBase
-                        Get-ADObject @Splat | ForEach-Object -Process {
-                            Get-PrivGPOZaurrLink -Object $_ -Limited:$Limited.IsPresent -GPOCache $GPOCache
+                        $ADObjectGPO = Get-ADObject @Splat
+                        foreach ($_ in $ADObjectGPO) {
+                            $OutputGPOs = Get-PrivGPOZaurrLink -Object $_ -Limited:$Limited.IsPresent -GPOCache $GPOCache
+                            foreach ($OutputGPO in $OutputGPOs) {
+                                if (-not $SkipDuplicates) {
+                                    $OutputGPO
+                                } else {
+                                    $UniqueGuid = -join ($OutputGPO.DomainName, $OutputGPO.Guid)
+                                    if (-not $CacheReturnedGPOs[$UniqueGuid]) {
+                                        $CacheReturnedGPOs[$UniqueGuid] = $OutputGPO
+                                        $OutputGPO
+                                    }
+                                }
+                            }
                         }
                     }
                     if ($Linked -contains 'Root') {
@@ -83,8 +101,20 @@
                         # }
                         $Splat['Filter'] = "objectClass -eq 'domainDNS'"
                         $Splat['SearchBase'] = $SearchBase
-                        Get-ADObject @Splat | ForEach-Object -Process {
-                            Get-PrivGPOZaurrLink -Object $_ -Limited:$Limited.IsPresent -GPOCache $GPOCache
+                        $ADObjectGPO = Get-ADObject @Splat
+                        foreach ($_ in $ADObjectGPO) {
+                            $OutputGPOs = Get-PrivGPOZaurrLink -Object $_ -Limited:$Limited.IsPresent -GPOCache $GPOCache
+                            foreach ($OutputGPO in $OutputGPOs) {
+                                if (-not $SkipDuplicates) {
+                                    $OutputGPO
+                                } else {
+                                    $UniqueGuid = -join ($OutputGPO.DomainName, $OutputGPO.Guid)
+                                    if (-not $CacheReturnedGPOs[$UniqueGuid]) {
+                                        $CacheReturnedGPOs[$UniqueGuid] = $OutputGPO
+                                        $OutputGPO
+                                    }
+                                }
+                            }
                         }
                     }
                     if ($Linked -contains 'Site') {
@@ -97,7 +127,8 @@
                             #}
                             $Splat['Filter'] = "(objectClass -eq 'site')"
                             $Splat['SearchBase'] = $SearchBase
-                            Get-ADObject @Splat | ForEach-Object -Process {
+                            $ADObjectGPO = Get-ADObject @Splat
+                            foreach ($_ in $ADObjectGPO) {
                                 Get-PrivGPOZaurrLink -Object $_ -Limited:$Limited.IsPresent -GPOCache $GPOCache
                             }
                         }
@@ -110,13 +141,25 @@
                         #}
                         $Splat['Filter'] = "(objectClass -eq 'organizationalUnit')"
                         $Splat['SearchBase'] = $SearchBase
-                        Get-ADObject @Splat | ForEach-Object -Process {
+                        $ADObjectGPO = Get-ADObject @Splat
+                        foreach ($_ in $ADObjectGPO) {
                             if ($_.DistinguishedName -eq $ForestInformation['DomainsExtended'][$Domain]['DistinguishedName']) {
                                 # other skips Domain Root
                             } elseif ($_.DistinguishedName -eq $ForestInformation['DomainsExtended'][$Domain]['DomainControllersContainer']) {
                                 # other skips Domain Controllers
                             } else {
-                                Get-PrivGPOZaurrLink -Object $_ -Limited:$Limited.IsPresent -GPOCache $GPOCache
+                                $OutputGPOs = Get-PrivGPOZaurrLink -Object $_ -Limited:$Limited.IsPresent -GPOCache $GPOCache
+                                foreach ($OutputGPO in $OutputGPOs) {
+                                    if (-not $SkipDuplicates) {
+                                        $OutputGPO
+                                    } else {
+                                        $UniqueGuid = -join ($OutputGPO.DomainName, $OutputGPO.Guid)
+                                        if (-not $CacheReturnedGPOs[$UniqueGuid]) {
+                                            $CacheReturnedGPOs[$UniqueGuid] = $OutputGPO
+                                            $OutputGPO
+                                        }
+                                    }
+                                }
                             }
                         }
                     }
@@ -143,8 +186,20 @@
                     }
 
                     try {
-                        Get-ADObject @Splat | ForEach-Object {
-                            Get-PrivGPOZaurrLink -Object $_ -Limited:$Limited.IsPresent -GPOCache $GPOCache
+                        $ADObjectGPO = Get-ADObject @Splat
+                        foreach ($_ in $ADObjectGPO) {
+                            $OutputGPOs = Get-PrivGPOZaurrLink -Object $_ -Limited:$Limited.IsPresent -GPOCache $GPOCache
+                            foreach ($OutputGPO in $OutputGPOs) {
+                                if (-not $SkipDuplicates) {
+                                    $OutputGPO
+                                } else {
+                                    $UniqueGuid = -join ($OutputGPO.DomainName, $OutputGPO.Guid)
+                                    if (-not $CacheReturnedGPOs[$UniqueGuid]) {
+                                        $CacheReturnedGPOs[$UniqueGuid] = $OutputGPO
+                                        $OutputGPO
+                                    }
+                                }
+                            }
                         }
                     } catch {
                         Write-Warning "Get-GPOZaurrLink - Processing error $($_.Exception.Message)"

Public/Invoke-GPOZaurrPermission.ps1

@@ -118,7 +118,14 @@
         [parameter(ParameterSetName = 'ADObject')]
         [parameter(ParameterSetName = 'Linked')]
         [parameter(ParameterSetName = 'Level')]
-        [switch] $LimitAdministrativeGroupsToDomain
+        [switch] $LimitAdministrativeGroupsToDomain,
+
+        [Parameter(ParameterSetName = 'GPOGUID')]
+        [Parameter(ParameterSetName = 'GPOName')]
+        [parameter(ParameterSetName = 'Filter')]
+        [parameter(ParameterSetName = 'ADObject')]
+        [parameter(ParameterSetName = 'Linked')]
+        [switch] $SkipDuplicates
     )
     if ($PermissionRules) {
         $Rules = & $PermissionRules
@@ -139,6 +146,7 @@
             IncludeDomains            = $IncludeDomains
             ExcludeDomains            = $ExcludeDomains
             ExtendedForestInformation = $ForestInformation
+            SkipDuplicates            = $SkipDuplicates.IsPresent
         }
         if ($ADObject) {
             $Splat['ADObject'] = $ADObject

README.md

@@ -39,6 +39,13 @@ That's it. Whenever there's a new version, you run the command, and you can enjo
 
 ## Changelog
 
+- 0.0.41 - 18.06.2020
+  - Added paramerter `SkipDuplicates` to `Invoke-GPOZaurrPermission` which prevents applying permissions over and over again if 1 GPO is linked to a multiple OU's within another OU
+- 0.0.40 - 18.06.2020
+  - Fix for error `Get-GPOZaurrLink` - same issue as described on my [earlier blog - Get-ADObject : The server has returned the following error: invalid enumeration context.](https://evotec.xyz/get-adobject-the-server-has-returned-the-following-error-invalid-enumeration-context/).
+    - `WARNING: Get-GPOZaurrLink - Processing error The server has returned the following error: invalid enumeration context.`
+    - `WARNING: Get-GPOZaurrLink - Processing error A referral was returned from the server`
+  - Added `SkipDuplicates` for `Get-GPOZaurrLink`
 - 0.0.39 - 17.06.2020
   - Updates to `Invoke-GPOZaurrPermission` with new parameter `LimitAdministrativeGroupsToDomain`
     - This will get administrative based on IncludeDomains if given. It means that if GPO has Domain admins added from multiple domains it will only find one, and remove all other Domain Admins (if working with Domain Admins that is)