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:






  • 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


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.


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About Me

I’ve worked in IT for over 20 years, and I know just about enough to realise that I don’t know very much.