Re: Security

[Wayne Lawton <wlawton@servtech.com>]

Theodore E. Dennison wrote:
> 
> Frank Cheung wrote:
> >
> > I have written a program in Ada83, and would like to provide some security
> > features to it:
> >
> > (1) the user should not be able to exit using ctrl-d, ctrl-z, etc.
> > (2) password access to enter and exit the program.
> >
> > Are there any routines or packages available to do this?  Thank you very
> > much in advance.
> >
> 
> In Ada? No. Bundled with your compiler? Probably.
> 

Actually, there is such a package.  I wrote a security package a few 
years ago for an Army system called MPMIS.  I have since been told that 
a version of the package found its way into the Army Reuse Center 
repository.

If that version isn't right, you may take a look at an Air Force system 
called the Combat Ammunition System (CAS).

I would recommend the CAS version as being the more mature.  

The algorithm uses a database to pass "I called/I was called by" 
information between modules in the system.  The package supports 
multi-level security based on the UNIX model.  That is users and groups 
of users have no access, read access, or execute access to a particular 
module in the system.  The package does require a database to support 
the tables.  The package supports encryption of the userids and 
passwords.

The package has been implemented in a multiple executable environment, 
as well as a multi-thread cooperative processing environment.

Hope one of these pointers helps...

Wayne Lawton
WLawton@servtech.com