file-permissions for append-only

From: Karl Scheibelhofer (karl.scheibelhofer_at_iaik.tugraz.at)
Date: 06/15/05 

Date: Wed, 15 Jun 2005 08:40:24 +0200

the Windows documentation about the adavanced file permission "Append Data"
(Create Folders/Append Data) says:

Append Data allows or denies making changes to the end of the file but not
changing, deleting, or overwriting existing data (applies to files only).

however, i cannot manage to append data to files which have set this
permission, but not the "Write Data" (Create Files/Write Data) permission. i
tried using a simple

echo test >> file.txt

and a simple program written in C, using

    fp = fopen(fileName,"a");

but both fail, if i do not also set the "Write Data" permission. users
should only be able to append data.
can anybody tell how to use file permissions correctly to enable certain
users to append data only, but not modify existing data in a file (e.g. a
log file)?

regards

  Karl

Relevant Pages

  • Re: Create folders / append data definition?
    ... It [append data] applies to files only and means the user has permission to append ... If you apply it to folders and subfolders only then the ... "create folders" permission would be the only permissions audited. ...
    (microsoft.public.win2000.security)
  • file permission for append-only
    ... Append Data allows or denies making changes to the end of the file but not ... changing, deleting, or overwriting existing data. ... permission, but not the "Write Data" permission. ...
    (microsoft.public.win2000.file_system)