Tuesday, February 24, 2009

Security with 2003 R2 FSRM quotas

This post provides information on several aspects of security with Windows Server 2003 R2 FSRM quotas, which you may come across if you use the previous two posts to implement FSRM quotas on a standalone server or MSCS clustered node.

LocalService Command Notification Task

If your quota has a notification task that runs a command, you may need to set the security of the executable or areas accessed by the command. By default, FSRM runs commands as the LocalService account - an account with restricted local permissions.

In this example, the command executed is the logentry.bat batch file from the previous post, which simply writes a log entry to a file. To allow the batch file to run as the localservice account – which is a member of the 'Authenticated Users' group, I set the following permissions:

  • Add authenticated users:R to the root (not OICI - object inherit, container inherit) using SDDL with cacls
  • Add authenticated users:R to c:\scripts to execute the logentry.bat file
  • Add authenticated users:C to c:\logs to allow writing the log entry
  • Ensure that cmd.exe can be executed (default permissions should suffice)

This was done with the following commands:

  • cacls c:\ /S:"D:PAI(A;OICI;FA;;;BA)(A;;0x1200a9;;;AU)(A;OICI;FA;;;SY)"
  • cacls c:\scripts /e /g "authenticated users":R
  • cacls c:\logs /e /g "authenticated users":C

Note that while testing this, I was using localsystem (unrestricted local permissions) to verify that security was the issue, but in an MSCS cluster when failing over the virtual server from one cluster node to the other, the quota template reset itself to localservice instead of localsystem.

Before setting permissions to allow LocalService to run the script, this left the notification task not executing successfully. Depending upon what your command does you may require elevated local or remote privilege, for which you may want to use localsystem or networkservice.

Target Permissions preventing execution

When specifying a command to run as a notification task, 2003 R2 FSRM will not allow running a command which standard users have change/full control to, directly or through inheritance.

To me this seems like an unusual approach for an out of the box Microsoft product and isn't very intuitive, as in my lab inherited permissions from a parent directory allowing Users:F were causing the task to fail.


Implementing 2003 FSRM quotas Command-line

2003 FSRM and NTFS Quotas compared

LocalService Account

Wayne's World of IT (WWoIT), Copyright 2009 Wayne Martin.

No comments:

All Posts

printQueue AD objects for 2003 ClusterVirtualCenter Physical to VirtualVirtual 2003 MSCS Cluster in ESX VI3
Finding duplicate DNS recordsCommand-line automation – Echo and macrosCommand-line automation – set
Command-line automation - errorlevels and ifCommand-line automation - find and findstrBuilding blocks of command-line automation - FOR
Useful PowerShell command-line operationsMSCS 2003 Cluster Virtual Server ComponentsServer-side process for simple file access
OpsMgr 2007 performance script - VMware datastores...Enumerating URLs in Internet ExplorerNTLM Trusts between 2003 and NT4
2003 Servers with Hibernation enabledReading Shortcuts with PowerShell and VBSModifying DLL Resources
Automatically mapping printersSimple string encryption with PowerShellUseful NTFS and security command-line operations
Useful Windows Printer command-line operationsUseful Windows MSCS Cluster command-line operation...Useful VMware ESX and VC command-line operations
Useful general command-line operationsUseful DNS, DHCP and WINS command-line operationsUseful Active Directory command-line operations
Useful command-linesCreating secedit templates with PowerShellFixing Permissions with NTFS intra-volume moves
Converting filetime with vbs and PowerShellDifference between bat and cmdReplica Domain for Authentication
Troubleshooting Windows PrintingRenaming a user account in ADOpsMgr 2007 Reports - Sorting, Filtering, Charting...
WMIC XSL CSV output formattingEnumerating File Server ResourcesWMIC Custom Alias and Format
AD site discoveryPassing Parameters between OpsMgr and SSRSAnalyzing Windows Kernel Dumps
Process list with command-line argumentsOpsMgr 2007 Customized Reporting - SQL QueriesPreventing accidental NTFS data moves
FSRM and NTFS Quotas in 2003 R2PowerShell Deleting NTFS Alternate Data StreamsNTFS links - reparse, symbolic, hard, junction
IE Warnings when files are executedPowerShell Low-level keyboard hookCross-forest authentication and GP processing
Deleting Invalid SMS 2003 Distribution PointsCross-forest authentication and site synchronizati...Determining AD attribute replication
AD Security vs Distribution GroupsTroubleshooting cross-forest trust secure channels...RIS cross-domain access
Large SMS Web Reports return Error 500Troubleshooting SMS 2003 MP and SLPRemotely determine physical memory
VMware SDK with PowershellSpinning Excel Pie ChartPoke-Info PowerShell script
Reading web content with PowerShellAutomated Cluster File Security and PurgingManaging printers at the command-line
File System Filters and minifiltersOpsMgr 2007 SSRS Reports using SQL 2005 XMLAccess Based Enumeration in 2003 and MSCS
Find VM snapshots in ESX/VCComparing MSCS/VMware/DFS File & PrintModifying Exchange mailbox permissions
Nested 'for /f' catch-allPowerShell FindFirstFileW bypassing MAX_PATHRunning PowerSell Scripts from ASP.Net
Binary <-> Hex String files with PowershellOpsMgr 2007 Current Performance InstancesImpersonating a user without passwords
Running a process in the secure winlogon desktopShadow an XP Terminal Services sessionFind where a user is logged on from
Active Directory _msdcs DNS zonesUnlocking XP/2003 without passwords2003 Cluster-enabled scheduled tasks
Purging aged files from the filesystemFinding customised ADM templates in ADDomain local security groups for cross-forest secu...
Account Management eventlog auditingVMware cluster/Virtual Center StatisticsRunning scheduled tasks as a non-administrator
Audit Windows 2003 print server usageActive Directory DiagnosticsViewing NTFS information with nfi and diskedit
Performance Tuning for 2003 File ServersChecking ESX/VC VMs for snapshotsShowing non-persistent devices in device manager
Implementing an MSCS 2003 server clusterFinding users on a subnetWMI filter for subnet filtered Group Policy
Testing DNS records for scavengingRefreshing Computer Account AD Group MembershipTesting Network Ports from Windows
Using Recovery Console with RISPAE Boot.ini Switch for DEP or 4GB+ memoryUsing 32-bit COM objects on x64 platforms
Active Directory Organizational Unit (OU) DesignTroubleshooting computer accounts in an Active Dir...260+ character MAX_PATH limitations in filenames
Create or modify a security template for NTFS perm...Find where a user is connecting from through WMISDDL syntax in secedit security templates

About Me

I’ve worked in IT for over 13 years, and I know just about enough to realise that I don’t know very much.