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(2014-08-18) PowerShell And DACLs In AD: Adding ACE For Read/Write Property On Some Object

Posted by Jorge on 2014-08-18


PowerShell Code to add an ACE to one or multiple OUs for some security principal to have read/write permissions for some attribute on some object.

Example object class: user

Example permission: Read Property and Write Property

Example attribute: employeeID

Example security principal: ADCORP\MyDelegationAdminGroup

# Clear The Screen Clear-Host # Get Script Location $scriptFolder = (Get-Location).Path # Get File With OUs To Process $fileWithListOfOUsToProcess = "List-Of-OUs-To-Process-For-Delegations.txt" # Import The Required Module Import-Module ActiveDirectory #Get The RootDSE Info $rootDSE = Get-ADRootDSE # Create Hash Table With The lDAPDisplayName And schemaIDGUID Of Each Schema Class And Attribute $mappingTable_lDAPDisplayName_schemaIDGUID = @{} Get-ADObject -SearchBase $($rootDSE.schemaNamingContext) ` -LDAPFilter "(schemaIDGUID=*)" ` -Properties lDAPDisplayName,schemaIDGUID | %{ $mappingTable_lDAPDisplayName_schemaIDGUID[$_.lDAPDisplayName]=[System.GUID]$_.schemaIDGUID } # Get List Of OUs To Process $listOfOUsToProcess = Get-Content $($scriptFolder + "\" + $fileWithListOfOUsToProcess) # Object Class And Attribute To Assign Permissions For $scopedObject = "user" $schemaIDGUIDScopedObject = $mappingTable_lDAPDisplayName_schemaIDGUID[$scopedObject] $scopedAttribute = "employeeID" $schemaIDGUIDScopedAttribute = $mappingTable_lDAPDisplayName_schemaIDGUID[$scopedAttribute] $inheritanceScope = "Descendents" # Security Principal To Assign Permissions To $securityPrincipalAccount = "ADCORP\MyDelegatedAdminGroup" $securityPrincipalObject = New-Object System.Security.Principal.NTAccount($securityPrincipalAccount) # Define ACE $rightsCollection = [System.DirectoryServices.ActiveDirectoryRights]::"ReadProperty","WriteProperty" $aclType = [System.Security.AccessControl.AccessControlType]::"Allow" $aceDefinition = $securityPrincipalObject,$rightsCollection,$aclType,$schemaIDGUIDScopedAttribute,$inheritanceScope,$schemaIDGUIDScopedObject $accessRule = New-Object System.DirectoryServices.ActiveDirectoryAccessRule($aceDefinition) # Process Each OU $listOfOUsToProcess | %{ $ou = $_ $ouDrivePath = $("AD:\" + $ou) Write-Host "" Write-Host "Processing OU: $ou" -Foregroundcolor Cyan Write-Host " ADDING ACE..." Write-Host " Security Principal...: $securityPrincipalAccount" Write-Host " ACL Type.............: $aclType" Write-Host " Access Type..........: $rightsCollection" Write-Host " Scoped Attribute.....: $scopedAttribute" Write-Host " Scoped Object Class..: $scopedObject" Write-Host " Scope................: $inheritanceScope" Write-Host "" $aclOU = Get-Acl $ouDrivePath $aclOU.AddAccessRule($accessRule) $aclOU | Set-Acl $ouDrivePath }

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Figure 1: Configuring The DACL Through PowerShell

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Figure 2: The ACE That Was Added

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Figure 3: Detailed Info Of The ACE

Get the PowerShell code from here.

Cheers,

Jorge

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* Always evaluate/test yourself before using/implementing this!

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