Re: "Write once-Read many" table ?
Date: Sun, 2 Mar 2008 13:06:53 -0800 (PST)
On Mar 2, 6:25 pm, DA Morgan <damor..._at_psoug.org> wrote:
> Niall Litchfield wrote:
> > On Feb 28, 8:26 am, DA Morgan <damor..._at_psoug.org> wrote:
> >> jm.scheiwi..._at_gmail.com wrote:
> >>> Hello,
> >>> For legal reasons, we would like to create tables where one can
> >>> insert, select but never never delete nor update.
> >>> I know we can prevent delete and update with revoke grants or with
> >>> triggers but this is not satisfactory because grants can be re-granted
> >>> and triggers can be dropped.
> >>> We want to make sure that a line inserted will never be changed - even
> >>> by the owner of the schema or by SYS or by any powerful dba.
> >>> Is there a way to achieve this ?
> >>> Is there a module to ensure this (database vault...) ?
> >>> Thank you in advance
> >>> Jean-Michel
> >> You are incorrect in your assumptions.
> >> You can absolutely lock down a database with triggers so that grants
> >> can not be made: Even by SYS AS SYSDBA. Audit Vault and Database
> >> Vault are perfect examples of how to do this.
> > If you can lock down a database as completely as you suggest Audit
> > Vault (secure storage for audit logs) would be a waste of money
> > surely. What happens to a database vault protected database if someone
> > starts it up with a different password file? I think you'll find that
> > sysdba wll work just fine - check out the official advice on what to
> > do if you forget the Database Vault Owners password for example.
> > Niall Litchfield
> It appears, from your last paragraph, that you don't understand how
> security in DataVault and AuditVault are implemented. It has nothing
> to do with the password file it has to do with wallets and event
> triggers that make short work of anyone that thinks those triggers
> can be end-run with a simple DISABLE or DROP.
> Here's a simple example for you:
> $ orapwd file=orapwavomega password=oracle1 entries=5 force=y
> $ sqlplus /nolog
> SQL> conn / as sysdba -- this will fail
> After you figure out how to log in as SYS with SYSDBA try to
> SELECT from any table owned by DVSYS. Try to enable, disable,
> grant, or revoke any privilege related to DVSYS.
Why then the following note in the docs
"Users who have access to a system as the Oracle software owner have control over the Oracle software, including the following activities:
Disabling Oracle Database Vault in the given system *
Reading unencrypted database files *
Moving and deleting database files *
Starting or stopping Oracle programs in the system
Oracle Database Vault does not provide protection against the operating system access of the Oracle software owner. "
I'll certainly do the test you describe, but the fact remains that anyone with access to run the command you describe (and that'll be commonly the dbas and the system administrators) can disable database vault entirely.
If you can run the command you list then you can also run
mv orapwavomega orapwavomega.old
orapwd file=orapwavomega password=oracle1 entries=5
what happens then?
> Let me know how you do. <g>
> Again, please, off-line.
> Daniel A. Morgan
> Oracle Ace Director & Instructor
> University of Washington
> damor..._at_x.washington.edu (replace x with u to respond)
> Puget Sound Oracle Users Groupwww.psoug.org
Received on Sun Mar 02 2008 - 15:06:53 CST