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PowerShell - Editing permissions on a file or folder

  • 10/01/2008

I got the following question from a reader the other day:

I've been trying to figure out how to change permissions on a folder in PowerShell. I've looked at the Get-Acl and Set-Acl, but I can only use them to copy the settings from a pre-existing object. How do I manually configure permissions?

This is actually a quite common question, so I thought I'd write a quick post on the subject.

Get-Acl and Set-Acl

To quote the PowerShell documentation "Get-Acl gets the security descriptor for a resource, such as a file or registry key." while "Set-Acl changes the security descriptor of a specified resource, such as a file or a registry key." In other words; if you want Folder_A to have the exact same permissions as Folder_B, then you simply copy the Access Control List (ACL) of Folder_B and "paste" it onto Folder_A.

 $Acl = Get-Acl "C:\Folder_B"
Set-Acl "C:\Folder_A" $Acl

So far, so good.

Changing the ACL

Okay, so you want to change the ACL. Here's some sample code for how to do that:

 New-Item -type directory -path C:\MyFolder
$Acl = Get-Acl "C:\MyFolder"
$Ar = New-Object  system.security.accesscontrol.filesystemaccessrule("username","FullControl","Allow")
$Acl.SetAccessRule($Ar)
Set-Acl "C:\MyFolder" $Acl

So, first we create a new folder. We then copy the ACL of that folder. We then create a new AccessRule that gives "username" full control. We then add this AccessRule to the ACL, and finally we reapply the new, altered ACL to the folder.

If we wanted to we could also have used $Acl.RemoveAccessRule($Ar) or possibly $Acl.RemoveAccessRuleAll() as well.

/ Johan

Comments

  • Anonymous
    October 01, 2008
    PingBack from http://blog.a-foton.ru/index.php/2008/10/01/powershell-editing-permissions-on-a-file-or-folder/

  • Anonymous
    October 02, 2008
    Say... I get the following error when I try your first example to copy folder permissions: Set-Acl : The security identifier is not allowed to be the owner of this object Any ideas why?

  • Anonymous
    October 02, 2008
    Good question. You're obviously getting this error because you're trying to change the owner of the object. By default NTFS will only allow you to set the owner of an object to: A: Yourself B: Administrators-group That's it. However, if you're an administrator or backup operator you can set it to any user, BUT this privilige is disabled by default and must be enabled before you can do so. In case you're wondering - this is a concious security restriction. There are no .NET or PowerShell specific ways of enabling this, but if we leave Microsoft-territory and visit the PowerShell Community Extensions project we find a way... I havent used PSCX that much and it's not a Microsoft product so any questions on them should be directed to www.codeplex.com/PowerShellCX rather than here, but here goes: Download and install PSCX from www.codeplex.com/PowerShellCX Set up a wrapper class for TokenPriviliege using the following syntax: $oTP = New-Object PSCX.Interop.TokenPriviliege Now, grant it to the current process: Set-Privilege $oTP You should now be able to change the owner of the folder to any user you wish. Have fun! / Johan

  • Anonymous
    November 05, 2008
    I would like to create a powershell script that would scour an OU for any users that are missing a home folder, create the folder on a NAS, apply the appropriate permissions and then set their AD profile to use this new location. Here is what i have so far, any assistance would be very helpfull: Get-QADUser -SizeLimit 0 -searchroot 'ou=,ou=,dc=,dc=,dc=***' | where{$_.homedirectory -eq $null} | foreach { $NasPath = '\NAS'+$.LogonName New-Item -type directory -Path $NasPath $Acl = Get-Acl $NasPath $Ar = New-Object system.security.accesscontrol.filesystemaccessrule($.LogonName,"FullControl","Allow") $Acl.RemoveAccessRule($Ar) Set-Acl $NasPath $Acl Set-QADUser $_ -ObjectAttributes @{'HomeDirectory'= $NasPath; 'HomeDrive'='Y'} } Thanks, Tony

  • Anonymous
    August 07, 2009
    The comment has been removed

  • Anonymous
    August 10, 2009
    Are you running the script in Vista with UAC turned on? Try running PowerShell with elevated privileges. (Run as administrator) / Johan

  • Anonymous
    December 10, 2009
    Hi Johan, I too got the same error of Set-Acl : The security identifier is not allowed to be the owner of this object As per your comment above, I tried installing the PSCX from codeplex. I also installed it as a PS Plug-in. When I try, $oTP = New-Object PSCX.Interop.TokenPriviliege I get the following error: New-Object : Cannot find type [PSCX.Interop.TokenPriviliege]: make sure the assembly containing this type is loaded. I am running Powershell v 1.0 Am I missing anything here? Thanks, Nisha

  • Anonymous
    November 09, 2010
    Also check this blog post with a few more details: blogs.technet.com/.../how-to-handle-ntfs-folder-permissions-security-descriptors-and-acls-in-powershell.aspx

  • Anonymous
    February 15, 2011
    I can get most of this to work, except the permissions will not apply.  The user shows up in the ACL of the directory, but no permissions are applied.

  • Anonymous
    April 21, 2011
    I have this working with the exception of folders that have "[" and "]" in the path. Any suggestions?

  • Anonymous
    June 02, 2011
    Matt can you share your code example.  I too am having issues and would like to see what you are doing. Thanks

  • Anonymous
    June 30, 2011
    Is it possible to do something like: $Acl = Get-Acl "D:folder" Set-Acl "d:folder_list.txt" $Acl I would like to apply the folder permissions to the same folder on a list of servers. Thanks!

  • Anonymous
    October 06, 2011
    The comment has been removed

  • Anonymous
    June 27, 2013
    This thread is really useful, Thanks so much. I am also getting "the security identifier is not allowed to be the owner of this object." Now that it is 2013, has anything changed to enable this? Or is it possible to leave the Owner as is and just change the group permissions?

  • Anonymous
    August 10, 2013
    I am having the same problems. I would like to use the PSCX but becaue of our securtiy rules i cannot use "third party" products? Any ideas how to fix the issue.

  • Anonymous
    November 01, 2013
    I have the same issue as Dave. I want to give "Network Service" full access to a directory. I followed the steps as outlined here and I see "Network Service" in the list of users but none of the permissions are applied. This is what I did.. please let me know if you see what is wrong: $Acl = Get-Acl $TSPath $AccessRule = New-Object System.Security.AccessControl.FileSystemAccessRule("Network Service", "FullControl", "Allow") $Acl.SetAccessRule($AccessRule) Set-Acl $TSPath $Acl I also noticed if I added the rule via the GUI and then queried using Get-Acl the user name was "NT AUTHORITYNETWORK SERVICE". However running the same script with that user name has the same result.

  • Anonymous
    January 13, 2014
    Thanks for this.. been a great help. I am now wanting to copy inherited permissions from Parent, Disable Inherit, remove all groups/users with Read Only Permission and add the user. I have got all this apart from the removing of Read Only Groups/Users. Can you help.. Here is what I have currently:- $l_Hdrive = "serverfolder" $l_User = "doaminuseraccount" $acl = Get-Acl "$l_Hdrive" $acl.SetAccessRuleProtection($true, $true) $AccessRule = New-Object System.Security.AccessControl.FileSystemAccessRule("$l_User", "Modify", "ContainerInherit,ObjectInherit", "None", "Allow") Set-Acl "$l_Hdrive" $Acl

  • Anonymous
    February 09, 2014
    I have a question, im trying to set the acl on multiple subolders based on a template catalog i made with all the right settings i want for the users. then make all subfolder of a specific share get the same ACL. the reason i want to do it that way is i manage 9 server shares with about 7000 subfolders $acltemplate = Get-Acl  "\servertemplate" $rootfolder = Get-ChildItem -Path \serverusershare foreach ($userfolder in $rootfolder) { $userfolder.FullName Set-Acl $userfolder.FullName $acltemplate }

  • Anonymous
    October 06, 2014
    Nice reading. Here is an article on how to set acl on remote folder (unc path) using powershell : www.shellandco.net/set-folders-acl-owner-and-ntfs-rights

  • Anonymous
    October 29, 2014
    A year later I happen to be having the same issue and I found this thread where I posted a question that was never answered. So after a little more research I found the solution (I had to call the overload that accepts the inheritance and propagation flags): $TSPath = "C:tempa" $Acl = Get-Acl $TSPath $networkService = New-Object System.Security.Principal.SecurityIdentifier([System.Security.Principal.WellKnownSidType]::NetworkServiceSid, $null); $rights = [System.Security.AccessControl.FileSystemRights]::FullControl $inheritance = int + int $propagation = [System.Security.AccessControl.PropagationFlags]::None $accessControl = [System.Security.AccessControl.AccessControlType]::Allow $AccessRule = New-Object System.Security.AccessControl.FileSystemAccessRule($networkService, $rights, $inheritance, $propagation , $accessControl) $Acl.SetAccessRule($AccessRule) Set-Acl $TSPath $Acl

  • Anonymous
    February 24, 2015
    Is it possible to disable delete permission with modify enabled through powershell. Rgds Senthil.A