Re: Detecting Ctrl-Alt-Del in Windows
On Fri, 02 Sep 2011 17:55:41 +1000, Chris Angelico wrote: That's why you have to hit CAD to get to the login form in some versions of Windows. The whole point of that secure sequence is that the OS and only the OS responds. Although I heard somewhere that that's more gimmick than guarantee, and that it IS possible for an app to hook CAD It's possible to configure how CAD is handled, but this requires Administrator privilege, so it's not exploitable (i.e. it doesn't gain you anything you can't obtain by other means). -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
On Thu, 01 Sep 2011 08:52:49 -0700, Den wrote: Also, is there a corresponding key-sequence in Mac and Linux? The nearest equivalent in MacOSX is Command-Option-Escape, which brings up the force-quit dialog. I don't know how deep down in the system it's implemented. It's possible to use SetSystemUIMode to put an app into a kiosk mode where force-quitting is disabled, but I don't know whether the app can intercept Command-Option-Escape in that situation and do something else with it. -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
On 9/1/11 8:52 AM, Den wrote: Obviously, this is a windows-based question. I know that Ctrl-Alt-Del is handled deep inside the OS, and I'm not trying to interrupt that. But is there some way to detect that a C-A-D has been pressed? IIUC, by definition, Ctrl-Alt-Delete can't be responded to in any way. Its the entire point of the sequence: when you type it you can be entirely, totally, 100% certain that what happens next is the true OS and not any app faking things. That's why you have to hit CAD to get to the login form in some versions of Windows. The whole point of that secure sequence is that the OS and only the OS responds. -- Stephen Hansen ... Also: Ixokai ... Mail: me+list/python (AT) ixokai (DOT) io ... Blog: http://meh.ixokai.io/ signature.asc Description: OpenPGP digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
On Fri, Sep 2, 2011 at 5:06 PM, Stephen Hansen me+list/pyt...@ixokai.io wrote: That's why you have to hit CAD to get to the login form in some versions of Windows. The whole point of that secure sequence is that the OS and only the OS responds. Although I heard somewhere that that's more gimmick than guarantee, and that it IS possible for an app to hook CAD - just that it's a lot harder than building a simple window that looks like the login... but it's pretty easy to fool a lot of people. Just look at the emails in your spam box one day, find the ones spoofing a bank, and see what a poor job they do. And yet they work. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
On 01/09/11 17:52, Den wrote: Obviously, this is a windows-based question. I know that Ctrl-Alt-Del is handled deep inside the OS, and I'm not trying to interrupt that. But is there some way to detect that a C-A-D has been pressed? Also, is there a corresponding key-sequence in Mac and Linux? And how might one detect those too? On Linux Ctrl+Alt+Delete is typically configured to reboot the machine when in console mode. In X11 (graphical), as far as I know, it's no different than other keys. To catch it globally, you'd probably have to go through the individual window manager. As m'colleague Nobody mentions, there's also the SysRq feature, but that always goes straight to the kernel and is, like Ctrl+Alt+Delete on Windows, impossible to handle in userspace code. Thomas -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
On Sep 1, 12:52 pm, Den patents...@gmail.com wrote: Obviously, this is a windows-based question. I know that Ctrl-Alt-Del is handled deep inside the OS, and I'm not trying to interrupt that. But is there some way to detect that a C-A-D has been pressed? If you manage to write a program that can detect CTRL-ALT-DEL, please report it as a bug in Windows! CTRL-ALT-DEL is Windows' secure attention sequence which must only be handled by the OS. -- Steve -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
Obviously, this is a windows-based question. I know that Ctrl-Alt-Del is handled deep inside the OS, and I'm not trying to interrupt that. But is there some way to detect that a C-A-D has been pressed? Others have pointed out that this shouldn't really be possible for reasons of security. (And I agree). However, if what you're really after is to detect a session switch or a logon then this might be of some use: http://timgolden.me.uk/python/win32_how_do_i/track-session-events.html TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
On Sep 2, 5:27 am, sjm sjms...@gmail.com wrote: On Sep 1, 12:52 pm, Den patents...@gmail.com wrote: Obviously, this is a windows-based question. I know that Ctrl-Alt-Del is handled deep inside the OS, and I'm not trying to interrupt that. But is there some way to detect that a C-A-D has been pressed? If you manage to write a program that can detect CTRL-ALT-DEL, please report it as a bug in Windows! CTRL-ALT-DEL is Windows' secure attention sequence which must only be handled by the OS. -- Steve I have already done that, in AutoHotKey ... or at least it used to work. AHK can detect when a window opened. And when CAD was pressed the ... well, I've forgotten what it was called ... but a window opened asking if you wanted to open the task manager, or quit or log off or what. Then you would know that CAD was pressed. There was nothing you could do to stop it, but you could at least detect that it had been pressed. That's why I was wondering if there was a similar technique which could be used in Python. Den -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
On Sep 2, 5:27 am, sjm sjms...@gmail.com wrote: On Sep 1, 12:52 pm, Den patents...@gmail.com wrote: Obviously, this is a windows-based question. I know that Ctrl-Alt-Del is handled deep inside the OS, and I'm not trying to interrupt that. But is there some way to detect that a C-A-D has been pressed? If you manage to write a program that can detect CTRL-ALT-DEL, please report it as a bug in Windows! CTRL-ALT-DEL is Windows' secure attention sequence which must only be handled by the OS. -- Steve I'm not trying to hook it or stop it, just detect it. Den -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
On Sep 1, 8:52 am, Den patents...@gmail.com wrote: Obviously, this is a windows-based question. I know that Ctrl-Alt-Del is handled deep inside the OS, and I'm not trying to interrupt that. But is there some way to detect that a C-A-D has been pressed? Also, is there a corresponding key-sequence in Mac and Linux? And how might one detect those too? Den I've been doing some more thinking on what I want. This may be a better explanation. Is there a way of detecting if my program has lost focus (I'm not sure the correct term)? For example, if someone is typing in my program, but some other program takes control (or CAD has been pressed) I would like simply to log that. I have no interest in trying to hijack or interfere with anything, simply log it. Den -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
On Sat, Sep 3, 2011 at 2:26 AM, Den patents...@gmail.com wrote: I've been doing some more thinking on what I want. This may be a better explanation. Is there a way of detecting if my program has lost focus (I'm not sure the correct term)? For example, if someone is typing in my program, but some other program takes control (or CAD has been pressed) I would like simply to log that. I have no interest in trying to hijack or interfere with anything, simply log it. Ah, then yes most definitely! If you're writing a GUI program, a LostFocus event is a normal thing to be able to catch. Now, if you're writing a console program, that mightn't be so easy. But certainly you can detect loss of focus to any window that you control. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
Chris Angelico wrote: Although I heard somewhere that that's more gimmick than guarantee, and that it IS possible for an app to hook CAD - just that it's a lot harder than building a simple window that looks like the login... And of course it's possible that someone has snuck in during the night and installed Linux on the machine, with a program that fakes a Windows login screen, with Ctrl-Alt-Delete and everything... -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Detecting Ctrl-Alt-Del in Windows
Obviously, this is a windows-based question. I know that Ctrl-Alt-Del is handled deep inside the OS, and I'm not trying to interrupt that. But is there some way to detect that a C-A-D has been pressed? Also, is there a corresponding key-sequence in Mac and Linux? And how might one detect those too? Den -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting Ctrl-Alt-Del in Windows
On Thu, 01 Sep 2011 08:52:49 -0700, Den wrote: Obviously, this is a windows-based question. I know that Ctrl-Alt-Del is handled deep inside the OS, and I'm not trying to interrupt that. But is there some way to detect that a C-A-D has been pressed? Not reliably. You might infer that Ctrl-Alt-Del has been used by the way that certain operations behave, but that's fairly error-prone. Also, is there a corresponding key-sequence in Mac and Linux? And how might one detect those too? I don't know about Mac. Linux has some support for Ctrl-Alt-Del on the console, and the optional Magic SysRq feature. But there's no easy way to detect these (if the sequence is recognised by the kernel, it's not reported by the usual mechanisms). -- http://mail.python.org/mailman/listinfo/python-list
