KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q98956: LM File Permission Enforcement on a CD-ROM Drive

Article: Q98956
Product(s): Microsoft LAN Manager
Version(s): 
Operating System(s): 
Keyword(s): kbnetwork
Last Modified: 30-JUL-2001

SUMMARY
=======

LAN Manager 2.0 and 2.0a cannot differentiate between file permissions for
CD-ROM Drive 1 and CD-ROM Drive 2. It can determine only that there is an E
drive, and it enforces whatever permissions have been created for files or
directories on E, no matter which CD happens to be in the CD-ROM drive. The same
is true for floppy disks and drives, and for any other removable media.

MORE INFORMATION
================

ACLs (Access Control Lists) for CD-ROM, floppy, and other removable media are
kept in the NET.ACC file (as are hard disk FAT partition ACLs).

ACLs created for a file or directory on a CD-ROM drive are recorded in NET.ACC
with reference to a drive letter and the designated path or file name. Thus, if
you assign read-only access privilege to User1 for the file \DOCS\BOOK.BAR on a
CD-ROM drive that the operating system sees as drive E, the ACL entry in NET.ACC
looks like this:

FILE ID             USER        PERMISSIONS
e:\docs\book.bar    User1        R

This entry remains in NET.ACC regardless of which CD is in the CD-ROM drive.
Thus, if you remove CD 1 and insert CD 2 and give User1 read and write
permission on the file \STUFF\SANE.TXT file on that CD, the NET.ACC entries look
like this:

FILE ID             USER         PERMISSIONS
e:\docs\book.bar    User1         R
e:\stuff\sane.txt   User1         RW

Now, if you remove CD 2 and re-insert CD 1, the ACL referencing E:\DOCS\BOOK.BAR
remains in NET.ACC and is still enforced.

Additional query words: 2.20 2.2

======================================================================
Keywords          : kbnetwork 

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.