functions/Import-GptLink.ps1
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function Import-GptLink { <# .SYNOPSIS Imports GPO Links. .DESCRIPTION Imports GPO Links. Use this to restore the exported links in their original order (or as close to it as possible). .PARAMETER Path The path from which to pick up the import file. .PARAMETER Name Only restore links of matching GPOs .PARAMETER Domain The domain into which to import. .EXAMPLE PS C:\> Import-GptLink -Path '.' Import GPO Links based on the exported links stored in the current path. #> [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSReviewUnusedParameter', '')] [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [string] $Path, [string[]] $Name = '*', [string] $Domain = $env:USERDNSDOMAIN ) begin { #region Utility Functions function Get-OU { <# .SYNOPSIS Retrieves an OU. Caches results. .DESCRIPTION Retrieves an OU. Caches results. Results are cached separately for each domain/server. .PARAMETER DistinguishedName The name of the OU to check. .PARAMETER Server The domain or server to check against. .EXAMPLE PS C:\> Get-OU -DistinguishedName $dn -Server $Domain Return the OU pointed at with $dn if it exists. #> [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [string] $DistinguishedName, [Parameter(Mandatory = $true)] [string] $Server ) if (-not $script:targetOUs) { $script:targetOUs = @{ } } if (-not $script:targetOUs[$Server]) { $script:targetOUs[$Server] = @{ } } if ($script:targetOUs[$Server].ContainsKey($DistinguishedName)) { return $script:targetOUs[$Server][$DistinguishedName] } try { $paramGetADOrganizationalUnit = @{ Identity = $DistinguishedName Server = $Server Properties = 'gpLink' ErrorAction = 'Stop' } $script:targetOUs[$Server][$DistinguishedName] = Get-ADOrganizationalUnit @paramGetADOrganizationalUnit } catch { $script:targetOUs[$Server][$DistinguishedName] = $null } return $script:targetOUs[$Server][$DistinguishedName] } function Set-GPLinkSet { [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseShouldProcessForStateChangingFunctions", "")] [CmdletBinding()] param ( $LinkObject, $Domain, $AllGpos, $Server ) foreach ($linkItem in $LinkObject) { $linkItem.Index = [int]($linkItem.Index) $linkItem.TotalCount = [int]($linkItem.TotalCount) } $orgUnit = Get-OU -DistinguishedName $LinkObject[0].TargetOU -Server $Domain $insertIndex = 1 foreach ($linkItem in ($LinkObject | Sort-Object Index)) { if ($orgUnit.LinkedGroupPolicyObjects -contains $linkItem.Policy.CleanedPath) { $insertIndex = $orgUnit.LinkedGroupPolicyObjects.IndexOf($linkItem.Policy.CleanedPath) + 1 continue } $paramSetGPLink = @{ LinkEnabled = 'Yes' Guid = $linkItem.Policy.ID Order = $insertIndex Domain = $Domain Enforced = 'No' Target = $orgUnit Server = $Server ErrorAction = 'Stop' } if ($linkItem.State -eq "1") { $paramSetGPLink['LinkEnabled'] = 'No' } if ($linkItem.State -eq "2") { $paramSetGPLink['Enforced'] = 'Yes' } try { $null = New-GPLink @paramSetGPLink New-ImportResult -Action 'Importing Group Policy Links' -Step 'Applying Link' -Target $linkItem.GpoName -Data $linkItem -Success $true } catch { if ($_.Exception.InnerException.HResult -eq 0x800700B7) { New-ImportResult -Action 'Importing Group Policy Links' -Step 'Applying Link: Already Exists' -Target $linkItem.GpoName -Data $linkItem -Success $true -ErrorData $_ } else { New-ImportResult -Action 'Importing Group Policy Links' -Step 'Applying Link' -Target $linkItem.GpoName -Data $linkItem -Success $false -ErrorData $_ } } $insertIndex++ } } #endregion Utility Functions $PSDefaultParameterValues['New-ImportResult:Action'] = 'Importing Group Policy Links' $PSDefaultParameterValues['New-ImportResult:Success'] = $false $pathItem = Get-Item -Path $Path if ($pathItem.Extension -eq '.csv') { $resolvedPath = $pathItem.FullName } else { $resolvedPath = (Get-ChildItem -Path $pathItem.FullName -Filter 'gp_links_*.csv' | Select-Object -First 1).FullName } if (-not $resolvedPath) { throw "Could not find GPO Links file in $($pathItem.FullName)" } $domainObject = Get-ADDomain -Server $Domain $policyObjects = Get-GPO -All -Domain $Domain | Select-Object *, @{ Name = 'CleanedPath' Expression = { $_.Path -replace $_.ID, $_.ID } } $linkData = Import-Csv $resolvedPath | Where-Object { Test-Overlap -ReferenceObject $_.GpoName -DifferenceObject $Name -Operator Like } | Select-Object *, @{ Name = "Policy" Expression = { $linkItem = $_ $policyObjects | Where-Object DisplayName -EQ $linkItem.GpoName } }, @{ Name = "TargetOU" Expression = { '{0},{1}' -f ($_.OUDN -replace ',DC=\w+'), $domainObject.DistinguishedName } } } process { $groupedLinks = $linkData | Group-Object -Property GpoName $groupedLinks | Where-Object Name -NotIn $policyObjects.DisplayName | ForEach-Object { New-ImportResult -Step 'Checking GPO existence' -Target $_.Name -Data $_.Group -ErrorData "GPO $($_.Name) does not exist" } $linksPolicyExists = ($groupedLinks | Where-Object Name -In $policyObjects.DisplayName).Group $linksPolicyExists | Where-Object { -not (Get-OU -DistinguishedName $_.TargetOU -Server $Domain) } | ForEach-Object { New-ImportResult -Step 'Checking OU existence' -Target $_.GpoName -Data $_ -ErrorData "OU $($_.TargetOU) does not exist, cannot link $($_.GpoName)" } $linksToProcess = $linksPolicyExists | Where-Object { Get-OU -DistinguishedName $_.TargetOU -Server $Domain } $groupedToProcess = $linksToProcess | Group-Object -Property TargetOU foreach ($linkSet in $groupedToProcess) { Set-GPLinkSet -LinkObject $linkSet.Group -Domain $domainObject.DNSRoot -AllGpos $policyObjects -Server $domainObject.PDCEmulator } } } |