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Why does adding NTFS SACL replace the DACL entries?

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Applies to

  • ONTAP 9
  • CIFS
  • NTFS
  • SACL
  • DACL

Answer

  • Configuring NTFS SACL with creating a new security descriptor will add 4 default NTFS DACL entries

cluster1::> vserver security file-directory ntfs show -vserver svm1 -ntfs-sd sd1
There are no entries matching your query.

cluster1::> vserver security file-directory ntfs sacl add -vserver svm1 -ntfs-sd sd1 -access-type failure -account demo\user -rights full-control -apply-to this-folder,sub-folders,files

cluster1::> vserver security file-directory ntfs dacl show -vserver svm1 -ntfs-sd sd1

Vserver: svm1
  NTFS Security Descriptor Name: sd1

    Account Name     Access   Access             Apply To
                     Type     Rights
    --------------   -------  -------            -----------
    BUILTIN\Administrators
                     allow    full-control      this-folder, sub-folders, files
    BUILTIN\Users    allow    full-control      this-folder, sub-folders, files
    CREATOR OWNER    allow    full-control      this-folder, sub-folders, files
    NT AUTHORITY\SYSTEM
                     allow    full-control      this-folder, sub-folders, files
4 entries were displayed.

  • If file-directory apply is ran against the security descriptor, the existing NTFS DACLS will be overwritten by the default ones listed above

This allows for data access if someone accidentally applied the security descriptor before defining more explicit DACLs

  • Before applying the file security policy, modify the NTFS DACLs to those desired

Removing these default DACLS without modification or replacement with the desired DACLS will result in a loss of data access

 

Additional Information

For more on adding/modifying/Deleting DACL on NTFS security descriptor
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