Jan 192018
 
Locks your system through a device driver. ASM source.
File PASSWRD4.ZIP from The Programmer’s Corner in
Category System Diagnostics
Locks your system through a device driver. ASM source.
File Name File Size Zip Size Zip Type
LOCK.ASM 8014 2028 deflated
PASSWRD4.ASM 7253 2322 deflated
PASSWRD4.DOC 3962 1662 deflated

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Contents of the PASSWRD4.DOC file


Brief documentation on PWORD.ASM (also called PASSWRD4.ASM)
by ... P. L. Olympia, Sysop SUGI SIG/M RBBS 301-963-5249

Thanks to John R. Petrocelli for sending me this program whose
original author I don't know. Thanks, Mr. Anonymous.

(*** SEE UPDATE AT END OF TEXT 02/05/85 CHANGES J.R.P. ***)
(*** SEE UPDATE AT END OF TEXT 04/30/85 CHANGES J.R.P. ***)

PURPOSE:

PASSWRD4.ASM is intended to produce a device driver (PASSWRD4.SYS) that
that you include in your CONFIG.SYS file. This driver will ask the user
on machine startup to provide a password. The user is repeatedly asked
for the password until the correct one is given. The user cannot get
out of this with CTRL-C or CTRL-BREAK, but may warmboot with CTRL-ALT-
DEL.


INSTALLATION:

Edit the file PASSWRD4.ASM and change the password (set in the
distribution program as 'plan') to something else that you can easily
remember. I suggest that you do NOT use your wife's name as everyone
else in the industry does that (don't know why but 45% of my BBS users
do that for some reason). The line that needs changing is this:

PASSWORD_STORE DB 4,'plan'
| |__ This is the password
|______ This is the # of chars in the password

If you don't use ANSI.SYS as a device driver, you may also want to
change the ESC sequence for hiding/unhiding user input in the block
called MSG_1 and MSG_2.

Next, compile the program with ASM or MASM.
MASM passwrd4

Then LINK it: (ignore the "no stack" message)
LINK passwrd4

Then use EXE2BIN to convert it to a SYS file:
EXE2BIN passwrd4 passwrd4.sys

Add this line to your CONFIG.SYS file:
DEVICE=passwrd4.sys

If you use ANSI.SYS, it should come before PASSWRD4.SYS.

That's it. Reboot and watch the fun. Enjoy ...


P.S. For all you budding programmers, the program is a handy tool for
learning how to set up a device driver.



*** UPDATE 02/05/85 JOHN R. PETROCELLI **************************

The driver program has been revised to allow the user to "lock"
the PC via a call into the device driver's code. The address of the
call is placed at interupt 66h in the table of interupt vectors.

An routine called "LOCK.COM" may be invoked to call the password
routine. This will prompt the user for the password after disabling
ctrl-break. The user must enter the correct password (same as on
boot up) before he may access the PC.

The reason that the call is made into the device driver's code
is so that if a password change is necessary then only the device
driver must be recompiled and relinked.

In order to prepare "LOCK.COM" ---------

Compile the program:
MASM LOCK

Then LINK it: (ignore the "no stack" message)
LINK LOCK

Then use EXE2BIN to convert it to a SYS file:
EXE2BIN LOCK LOCK.COM

Then delete the LOCK.EXE file:
ERASE LOCK.EXE

I would appreciate any comments or suggestions. Send them to:
JOHN R. PETROCLLI
3090 CARMAN RD.
SCHENECTADY, N.Y. 12303

*** UPDATE 04/30/85 JOHN R. PETROCELLI **************************

With PASSWRD3.SYS if the "LOCK" command was used one was able to
defeat the password by pressing CTRL-C. The current version, "PASSWRD4.
SYS", has taken this into account and for the "LOCK" command all CTRL
style keystrokes are treated as normal keystrokes. Thus I would suggest
that you do not use any keystrokes which require the CTRL key to be
held down in order to enter your password.

I would appreciate any comments or suggestions. Send them to:
JOHN R. PETROCLLI
3090 CARMAN RD.
SCHENECTADY, N.Y. 12303



 January 19, 2018  Add comments

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