Labels

Friday, March 7, 2008

SDDL syntax in secedit security templates

My summary of the SDDL syntax and security templates with regards to inheritance:

  • The second column in a security template entry dictates the action on existing explicit ACE's, 0 will merge, 2 will overwrite (and 1 is used during OS install).
  • DACL flags, P - Protected against inheriting from above, AI - Automatically propagate the ACL to child objects (assuming P not set deeper), AR - same as AR but checks if the file system supports automatic propagation of inheritable ACE's (eg. NT4)
  • ACE OI - Object Inherit, subordinate files will inherit the ACE - including files deeper in the tree (unless NP is set). Equivalent to 'This folder and files' in the GUI.
  • ACE CI - Container Inherit, subordinate containers will inherit the ACE - including directories deeper in the tree (unless NP is set). Direct children will inherit the ACE. Equivalent to 'This folder and subfolders' in the GUI.
  • ACE OICI - Combination of OI an CI above. Equivalent to 'This folder, subfolders, and files' in the GUI
  • ACE NP - Non-propagate, subordinate objects will not propagate the inherited ACE any further

For example:
SDDL:

"C:\Test\",0,"D:PAR(A;OICI;FA;;;BA)(A;OICINP;0x1200a9;;;BU)(A;OICI;FA;;;SY)"

"C:\Test\AAAA",0,"D:AR(A;OICI;FA;;;BA)(A;OICI;0x1200a9;;;BU)(A;OICI;FA;;;SY)"

"C:\Test\BBBB",0,"D:PAR(A;OICI;FA;;;BA)(A;OI;0x1301bf;;;BU)(A;OICI;FA;;;SY)"

"C:\Test\CCCC",2,"D:(A;OICI;FA;;;BA)(A;CI;0x1200a9;;;BU)(A;OICI;FA;;;SY)"

Explanation:

  • C:\Test - Protected from above, Auto-inherit below, merge with explicit ACL, Users:R for 'This folder, subfolders, and files' and non-propagate on the ACE. This will ensure access to the root, sub-folders and files in the root for all users, except for any secured sub-folders not inherit this ACE.
  • C:\Test\AAAA - Allow inherit from above (not protected), auto-inherit below, merge with explicit ACL, Users:R.
  • C:\Test\BBBB - Protected from above, auto-inherit below, merge with explicit ACL, Users:C to subordinate files, but not containers - 'This folder and files'
  • C:\Test\CCCC - Allow inherit from above (not protected), do not automatically propagate deeper (no AR), overwrite explicit ACL, container inherit - 'This folder and subfolders'

Note that to apply such a security template on a remote machine, you could run (assuming the security template location):

  • psexec \\%server% secedit /configure /db c:\windows\temp\%random%.sdb /cfg c:\windows\security\templates\%template%.inf /log c:\windows\temp\Configure.log

References:

Win32_SecurityDescriptor Class

Security Descriptor String Format

Understanding Container Access Inheritance Flags in Windows 2000

Unexpected Results Occur If You Set File Security by Using Either Group Policy or Security Templates



Wayne's World of IT (WWoIT), Copyright 2008 Wayne Martin.

1 comment:

Anonymous said...

Thanks for the Secedit info, just what I was after.


Sguilly


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.