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| Disable Ctrl-Alt-Delete for Visual Basic .net |
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This message was discovered on microsoft.public.dotnet.general.
| Greg |
I am developing an application where I need to secure a
workstation for periods of time. I can use BlockInput to
stop users from task switching or messing with the
keyboard, but I would like to disable Ctrl-Alt-Delete.
It seems there seems to be only one real way I know
about: Write a replacement Gina Driver to eat the
keyboard events I dont want. Does anyone have a good
template for this in Visual Basic .Net?
Or if there is an easier way that work in Win2K I am all
ears!
Thanks!
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| Scott M. |
I would think that if you could override CTL+ALT+DEL, you'd be getting
around one of Window's main security tasks.
"Greg" <Click here to reveal e-mail address> wrote in message
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| gregory_may@n_o_s_p_a_m_hotmail.com |
Thats exactly right.
In some environments, the PC's need to be locked down tighter than normal.
Hence I need to disable this screen under certain conditions.
g.
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| Scott M. |
My point was, I don't think MS provides a way to defeat their first line of
defense.
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| gregory_may |
This article seems to give a good overview if I knew C better:
http://www.codeguru.com/mfc/comments/2574.shtml
Here is a Microsoft article that tells me about a Platform SDC with the C
code that I need, but I was hoping for a VB port someplace. C is pretty
weak for me.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/security/winlogon_and_gina.asp
Here is a guy doing it in DELPHI!:
http://rds.yahoo.com/S=2766679/K=ginastub+visual+basic/v=2/TID=DF4H_3/SID=w/l=WS1/R=3/H=0/*-http://oldlook.experts-exchange.com/Programming/Programming_Languages/Delphi/Q_20747621.html
"Scott M." <Click here to reveal e-mail address> wrote in message
news:Click here to reveal e-mail address...
> My point was, I don't think MS provides a way to defeat their first line
of
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| gregory_may |
A reply to this thread has been made in microsoft.public.dontnet.fraimwork
(I am posting here):
Hello,
Thanks for your post. As I understand, you want to trap and disable
Ctrl-Alt-Delete programmatically in Win2K. Please correct me if there is
any misunderstanding. I reviewed your description carefully, and now I'd
like to share the following information with you:
1. As documented in the article to which you pointed, you can use
DisableTaskMgr to disable Ctrl+Alt+Del. To trap Ctrl+Alt+Del, you have
three options: write a GINA stub, write a keyboard driver, or replace
TaskMgr.exe with your own program. I recommend you create a GINA stub which
is comparatively easy to implement among these three options.
2. However, we have to use VC instead of VB to implement a GINA Stub. As
you know, a GINA Stub is a native dynamic-link library (DLL) exported to
Winlogon that requires a valid, consistent function to call into. This
requires a DLL export, which .NET Framework does not support. Managed code
(VB .NET, C#) has no concept of a consistent value for a function pointer
because these function pointers are proxies that are built dynamically.
3. There is an existing GINA Stub sample in MSDN. To trap/disable
Ctrl-Alt-Delete, you just need to replace its WlxLoggedOnSAS with the one
in my code snippet below.
GinaStub Sample: Pass-through "Stub" Gina
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample98/
html/vcsmpginastubsample.asp?frame=true
/*----------------------------code snippet----------------------*/
int
WINAPI
WlxLoggedOnSAS(
PVOID pWlxContext,
DWORD dwSasType,
PVOID pReserved)
{
if (dwSasType == WLX_SAS_TYPE_CTRL_ALT_DEL)
{
/* Add additional code of you own */
return WLX_SAS_ACTION_NONE;
}
else
return GWlxLoggedOnSAS( pWlxContext, dwSasType, pReserved );
}
/*-----------------------------end of--------------------------------*/
In addition, I believe the following MSDN aritcles are helpful:
WlxLoggedOnSAS
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/se
curity/wlxloggedonsas.asp
Loading and Running a GINA DLL
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/se
curity/loading_and_running_a_gina_dll.asp
Please feel free to let me know if you have any problems or concerns.
Have a nice day!
Regards,
HuangTM
Microsoft Online Partner Support
MCSE/MCSD
Get Secure! -- www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.
"gregory_may" <None> wrote in message
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| Mahesh Reddy |
(Type your message here)
--------------------------------
From: Mahesh Reddy
hi Mr. gregory_may
i have written replace ment gina for MSGINA.
but it is having one problem. In winlogging mode after coming to user login mode if anybody pressed Ctrl+Alt+Delete. it is showing the error as SAS window winlogon.exe - Appliction error.
so can you tell what can be the problem or how can i disable
Ctrl+Alt+Delete in winlogging mode only. If i disable it in wlxinitialise
funtion of gina.
Ctrl+Alt+Delete will be disabled in desktop mode. so plz suggest me what can be the problem.
thanks in advance
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