Boot loop after changing permissions for /applications directory

Hi there,
i have an imac with leopard OS. After a program install complained about missing priviliges for /applications directory
i adjusted the permissions for this folder. I changed admin user right from read to read/write and added another user, also with read/write rights.
After applying the permissions (including subdirectories) i rebooted.
Now the mac doesn`t come up anymore. It boots, shows the apple and the turning wheel and after 3-5 minutes boots again in a loop.
Any ideas highly aprreciated....
thx

Attempt to reboot in Safe Mode then try restarting normally.

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I issued the Terminal commands you suggested in the other thread you linked to.
I then ran Disk Utility's Repair Permissions. It took about 30 minutes and returned 799,331 legitimate permissions errors, which it fixed. All were in the Applications folder.
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Hello,
I was trying to take ownership & fix permissions on Home Folder/My Documents structures, I ran into the common problem in PowerShell where Set-Acl & Get-Acl return access denied errors. The error occurs because the Administrators have been removed from
file permissions and do not have ownership of the files,folders/directories. (Assuming all other permissions like SeTakeOwnershipPrivilege have been enabled.
I was not able to find any information about someone successfully using native PS to resolve the issue. As I was able to solve the issues surrounding Get-Acl & Set-Acl, I wanted to share the result for those still looking for an answer.
Question: How do you use only Powershell take ownership and reset permissions for files or folders you do not have permissions or ownership of?
Problem:
Using the default function calls to the object fail for a folder that the administrative account does not have permissions or file ownership. You get the following error for Get-Acl:
PS C:\> Get-Acl -path F:\testpath\locked
Get-Acl : Attempted to perform an unauthorized operation.
+ get-acl <<<< -path F:\testpath\locked
+ CategoryInfo : NotSpecified: (:) [Get-Acl], UnauthorizedAccessException
+ FullyQualifiedErrorId : System.UnauthorizedAccessException,Microsoft.PowerShell.Commands.GetAclCommand
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Set-Acl : Attempted to perform an unauthorized operation.
At line:1 char:8
+ Set-Acl <<<< -path "F:\testpath\locked" -AclObject $DirAcl
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+ FullyQualifiedErrorId : System.UnauthorizedAccessException,Microsoft.PowerShell.Commands.SetAclCommand
Use of other functions like .GetAccessControl will result in a similar error: "Attempted to perform an unauthorized operation."
How do you replace owner on all subcontainers and objects in Powershell with resorting to external applications like takeown, icacls, Windows Explorer GUI, etc.?
Tony

Hello,
Last, here is the script I used to reset permissions on the "My Documents" tree structure that admins did not have access to:
Example: Powershell script to parse a directory of User-owned "My Document" redirection folders and reset permissions.
#Script to Reset MyDocuments Folder permissions
$domainName = ([ADSI]'').name
Import-Module "PSCX" -ErrorAction Stop
Set-Privilege (new-object Pscx.Interop.TokenPrivilege "SeRestorePrivilege", $true) #Necessary to set Owner Permissions
Set-Privilege (new-object Pscx.Interop.TokenPrivilege "SeBackupPrivilege", $true) #Necessary to bypass Traverse Checking
#Set-Privilege (new-object Pscx.Interop.TokenPrivilege "SeSecurityPrivilege", $true) #Optional if you want to manage auditing (SACL) on the objects
Set-Privilege (new-object Pscx.Interop.TokenPrivilege "SeTakeOwnershipPrivilege", $true) #Necessary to override FilePermissions & take Ownership
$Directorypath = "F:\Userpath" #locked user folders exist under here
$LockedDirs = Get-ChildItem $Directorypath -force #get all of the locked directories.
Foreach ($Locked in $LockedDirs) {
Write-Host "Resetting Permissions for "$Locked.Fullname
#######Take Ownership of the root directory
$blankdirAcl = New-Object System.Security.AccessControl.DirectorySecurity
$blankdirAcl.SetOwner([System.Security.Principal.NTAccount]'BUILTIN\Administrators')
$Locked.SetAccessControl($blankdirAcl)
###################### Setup & apply correct folder permissions to the root user folder
#Using recommendation from Ned Pyle's Ask Directory Services blog:
#Automatic creation of user folders for home, roaming profile and redirected folders.
$inherit = [system.security.accesscontrol.InheritanceFlags]"ContainerInherit, ObjectInherit"
$propagation = [system.security.accesscontrol.PropagationFlags]"None"
$fullrights = [System.Security.AccessControl.FileSystemRights]"FullControl"
$allowrights = [System.Security.AccessControl.AccessControlType]"Allow"
$DirACL = New-Object System.Security.AccessControl.DirectorySecurity
#Administrators: Full Control
$DirACL.AddAccessRule((new-object System.Security.AccessControl.FileSystemAccessRule("BUILTIN\Administrators",$fullrights, $inherit, $propagation, "Allow")))
#System: Full Control
$DirACL.AddAccessRule((new-object System.Security.AccessControl.FileSystemAccessRule("NT AUTHORITY\SYSTEM",$fullrights, $inherit, $propagation, "Allow")))
#Creator Owner: Full Control
$DirACL.AddAccessRule((new-object System.Security.AccessControl.FileSystemAccessRule("CREATOR OWNER",$fullrights, $inherit, $propagation, "Allow")))
#Useraccount: Full Control (ideally I would error check the existance of the user account in AD)
#$DirACL.AddAccessRule((new-object System.Security.AccessControl.FileSystemAccessRule("$domainName\$Locked.name",$fullrights, $inherit, $propagation, "Allow")))
$DirACL.AddAccessRule((new-object System.Security.AccessControl.FileSystemAccessRule("$domainName\$Locked",$fullrights, $inherit, $propagation, "Allow")))
#Remove Inheritance from the root user folder
$DirACL.SetAccessRuleProtection($True, $False) #SetAccessRuleProtection(block inheritance?, copy parent ACLs?)
#Set permissions on User Directory
Set-Acl -aclObject $DirACL -path $Locked.Fullname
Write-Host "commencer" -NoNewLine
##############Restore admin access & then restore file/folder inheritance on all subitems
#create a template ACL with inheritance re-enabled; this will be stamped on each subitem to re-establish the file structure with inherited ACLs only.
#$NewOwner = New-Object System.Security.Principal.NTAccount("$domainName","$Locked.name") #ideally I would error check this.
$NewOwner = New-Object System.Security.Principal.NTAccount("$domainName","$Locked") #ideally I would error check this.
$subFileACL = New-Object System.Security.AccessControl.FileSecurity
$subDirACL = New-Object System.Security.AccessControl.DirectorySecurity
$subFileACL.SetOwner($NewOwner)
$subDirACL.SetOwner($NewOwner)
######## Enable inheritance ($False) and not copy of parent ACLs ($False)
$subFileACL.SetAccessRuleProtection($False, $False) #SetAccessRuleProtection(block inheritance?, copy parent ACLs?)
$subDirACL.SetAccessRuleProtection($False, $False) #SetAccessRuleProtection(block inheritance?, copy parent ACLs?)
#####loop through subitems
$subdirs = Get-ChildItem -path $Locked.Fullname -force -recurse #force is necessary to get hidden files/folders
foreach ($subitem in $subdirs) {
#take ownership to insure ability to change permissions
#Then set desired ACL
if ($subitem.Attributes -match "Directory") {
# New, blank Directory ACL with only Owner set
$blankdirAcl = New-Object System.Security.AccessControl.DirectorySecurity
$blankdirAcl.SetOwner([System.Security.Principal.NTAccount]'BUILTIN\Administrators')
#Use SetAccessControl to reset Owner; Set-Acl will not work.
$subitem.SetAccessControl($blankdirAcl)
#At this point, Administrators have the ability to change the directory permissions
Set-Acl -aclObject $subDirACL -path $subitem.Fullname -ErrorAction Stop
} Else {
# New, blank File ACL with only Owner set
$blankfileAcl = New-Object System.Security.AccessControl.FileSecurity
$blankfileAcl.SetOwner([System.Security.Principal.NTAccount]'BUILTIN\Administrators')
#Use SetAccessControl to reset Owner; Set-Acl will not work.
$subitem.SetAccessControl($blankfileAcl)
#At this point, Administrators have the ability to change the file permissions
Set-Acl -aclObject $subFileACL -path $subitem.Fullname -ErrorAction Stop
Write-Host "." -NoNewline
Write-Host "fin."
Write-Host "Script Complete."
I hope you find this useful.
Thank you,
Tony
Final Thought: There are great non-PS tools like
Set-Acl and takeown which are external to PS & can also do the job wonderfully. It may be much simpler to call those tools than recreate the wheel in pure
code. Feel free to use whatever best suits your time, scope & cost.

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Message was edited by: Thor Stevens

Thor Stevens wrote:
I wanted to change permissions on a fiie in my root Library (not Home Library) and clicked apply to enclosed items for the entire Library folder. Once I realized what happened (after the fact) I tried to repair permissions but things aren't working right obviously. I have a backup of the Library on my Time Machine drive that is before the snafu.
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Always learning,
Thanks
Message was edited by: Thor Stevens

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TechNet Community Support

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Hi,
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Boot loop after changing permissions for /applications directory

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