[Info-vax] ODS-5 data/file recovery

[Stephen Hoffman]

On 2013-02-17 15:58:38 +0000, MG said:

> On 17-feb-2013 15:29, Stephen Hoffman wrote:
>> Individula files can be marked as erase-on-delete, as can whole volumes.
>> 
>> When erase-on-delete is in use on the file or the volume and a file is
>> deleted, its contents are erased.
>> 
>> Use Google or Bing to search the h71000.www7.hp.com server for "erase on
>> delete" and start reading.
> 
> I know what it is, I just don't know (as I asked) how it could've been
> invoked... so it's more a question of whether CIFS 'issued' it for me.

Few tools implement this sort of security.  Even those tools with 
sensitive data or even passwords don't necessarily erase that data 
securely.  Some few tools either do use the OpenVMS mechanisms to avoid 
remanence, or do recommend the use of erase-on-delete or highwater 
marking with data, or both.

CIFS is not among these products.

Alternatively — and getting back to what some experience with looking 
at source code allows here — check the source code for CIFS/Samba, and 
see what it does.

Here <http://carlo17.home.xs4all.nl/howto/undelete_ext3.html> is 
somebody else that's gone through something similar, though that was 
with a Linux file system.

Samba does have a recycling mechanism, but I haven't looked to see if 
it's implemented in the OpenVMS CIFS/Samba port.  AFAIK, it has to be 
enabled, too; it's not on by default.


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