2 Jan
2012
2 Jan
'12
3:11 p.m.
Hi !
Every time I'm unlocking the TDE screen it's asking me "Press
Ctrl-Alt-Del to begin". First of all it's very annoying, but beside of
that, I can't send "ctrl-alt-del" via the VNC connection, so I can't use
my computer remotely (a similar problem with Windows OSes can be
resolved by manipulating of registry database).
How can I get the password entering dialog directly, without C-A-Del ?
Cheers,
Ilya
2 Jan
2 Jan
3:32 p.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
Hi !
Every time I'm unlocking the TDE screen it's asking me "Press
Ctrl-Alt-Del to begin". First of all it's very annoying, but beside of
that, I can't send "ctrl-alt-del" via the VNC connection, so I can't
use
my computer remotely (a similar problem with Windows OSes can be
resolved by manipulating of registry database).
How can I get the password entering dialog directly, without C-A-Del ?
Cheers,
Ilya
Hi Ilya,
The screen you refer to is an enhanced security feature for local logins.
If you want to turn it off, simply go to the Control Center-->System
Administration-->Login Manager and uncheck the "Enable Secure Attention
Key" checkbox.
Tim
3 Jan
3 Jan
8:39 a.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
Hi Timothy !
01/02/2012 05:32 PM, ext Timothy Pearson пишет:
simply go to the Control
Center-->System->Administration-->Login Manager
and uncheck the "Enable Secure Attention Key" checkbox.
I did it, but it still appears. Do I have to log off and log in again in
order to make "Ctrl-Alt-Del" dialog not appear again after screen lock?
Cheers,
Ilya
2 Jan
2 Jan
4:05 p.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
On Monday 02 January 2012 15:11:53 Ilya Dogolazky wrote:
Hi !
Every time I'm unlocking the TDE screen it's asking me "Press
Ctrl-Alt-Del to begin". First of all it's very annoying, but beside of
that, I can't send "ctrl-alt-del" via the VNC connection, so I can't
use
my computer remotely (a similar problem with Windows OSes can be
resolved by manipulating of registry database).
My vnc client (xtightvncserver) will allow me to send ctrl-alt-del. F8 pops up
a menu and send ctrl-alt-del is one of the choices. I believe some other VNC
clients are similar.
HTH
Neil Youngman
3 Jan
3 Jan
8:43 a.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
Hi Neil !
01/02/2012 06:05 PM, ext Neil Youngman пишет:
My vnc client (xtightvncserver) will allow me to send
ctrl-alt-del. F8 pops up
a menu and send ctrl-alt-del is one of the choices. I believe some other VNC
clients are similar.
As I mentioned in my original posting, I can do exactly the
same
(F8->menu->"send Ct-Al-De") with my client (xvnc4viewer) when the server
(WinVNC) is running on Windows. Alas, this doesn't work with the same
client and the server (x11vnc) running in a TDE session.
Cheers,
Ilya
11:34 a.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
On Tuesday 03 January 2012 08:43:35 Ilya Dogolazky wrote:
Hi Neil !
01/02/2012 06:05 PM, ext Neil Youngman пишет:
So your client can send the CTRL-ALT_DEL, but the server isn't responding to
it?
If I am interpreting that right, it wasn't that clear (at least to me) from
reading your original message. I hope the other answers have solved your
problem.
Neil Youngman
My vnc client (xtightvncserver) will allow me to
send ctrl-alt-del. F8
pops up a menu and send ctrl-alt-del is one of the choices. I believe
some other VNC clients are similar.
As I mentioned in my original posting, I can do exactly the same
(F8->menu->"send Ct-Al-De") with my client (xvnc4viewer) when the server
(WinVNC) is running on Windows. Alas, this doesn't work with the same
client and the server (x11vnc) running in a TDE session. 
12:03 p.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
As I mentioned in my original posting, I can do
exactly the same
(F8->menu->"send Ct-Al-De") with my client (xvnc4viewer) when the server
(WinVNC) is running on Windows. Alas, this doesn't work with the same
client and the server (x11vnc) running in a TDE session.
Does it work when you run FVWM or TWM instead of TDE?
Nik
1:02 p.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
Am Dienstag, 3. Januar 2012 schrieb Ilya Dogolazky:
01/03/2012 02:03 PM, ext Mag. Dr. Nikolaus Klepp
пишет:
Try it. Or you can try ctrl+alt+del on TDE while the scree is not locked, it
should pop up a dialog box. But if I remember right, there was an issue with
some xservers and VNC.
Nik
Does it work when you run FVWM or TWM instead of
TDE?
No idea, I never used FVWM or TWM as a "real" window manager.
5:11 p.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
Lieber Herr Mag. Dr. Klepp,
01/03/2012 03:02 PM, ext Mag. Dr. Nikolaus Klepp пишет:
Try it.
Alas, to try it I would have to configure yet another window manager,
and learn how to do it something useful by receiving C-A-Del.
Or you can try ctrl+alt+del on TDE while the scree is
not locked
That's a good idea, so I did it. After I sent
"Ctrl-Alt-Del" from the
"F8-menu" of xvnc4viewer (when the screen was *not* locked), TDE opened
the "End session for 'ilya'" dialog (with a dragon sleeping on the
moon). And that is not the same dialog as I got by pressing C-A-Del
physically today.
Should I file a bug about it, or is there any other explanation for this
behaviour?
Schöne Grüße,
-- Ilya Dogolazky, dr. rer. nat.
5:47 p.m.
New subject: New Fedora 16 / TDE 3.5.13 LiveCD
Hello,
For people who are interested in testing TDE 3.5.13, I've built an
updated Fedora 16 LiveCD .
It contains Fedora 16 for i686 computers, with all available Fedora
updates at this time, and TDE 3.5.13 with some applications plus several
fixes/patches from bugtracker. The desktop is basically customized to
look like an official Fedora 16 desktop environment (background, start
button).
The distro is also installable on your hard drive so that you can
install Fedora if you like it :-)
The ISO size is 689 MB (721420288 bytes).
It should be available on the mirrors at the following URL, when the
mirrors will be synced:
http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity/rpm/f16/trinity-…
And the MD5 file:
http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity/rpm/f16/trinity-…
Have fun with TDE 3.5.13 :-)
Francois Andriot
5 Jan
5 Jan
5:31 p.m.
New subject: [trinity-users] New Fedora 16 / TDE 3.5.13 LiveCD
Le 03/01/2012 18:47, Francois Andriot a écrit :
Hello,
For people who are interested in testing TDE 3.5.13, I've built an
updated Fedora 16 LiveCD .
It contains Fedora 16 for i686 computers, with all available Fedora
updates at this time, and TDE 3.5.13 with some applications plus
several fixes/patches from bugtracker. The desktop is basically
customized to look like an official Fedora 16 desktop environment
(background, start button).
The distro is also installable on your hard drive so that you can
install Fedora if you like it :-)
The ISO size is 689 MB (721420288 bytes).
It should be available on the mirrors at the following URL, when the
mirrors will be synced:
http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity/rpm/f16/trinity-…
And the MD5 file:
http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity/rpm/f16/trinity-…
Have fun with TDE 3.5.13 :-)
It looks like the mirrors are not synchronized (yet) ...
Here is a bittorrent file to help downloading the ISO :
http://www.multiupload.com/XNJTI80P3B
Francois Andriot
3 Jan
3 Jan
6:15 p.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
That's a good idea, so I did it. After I sent
"Ctrl-Alt-Del" from the
"F8-menu" of xvnc4viewer (when the screen was *not* locked), TDE opened
the "End session for 'ilya'" dialog (with a dragon sleeping on the
moon). And that is not the same dialog as I got by pressing C-A-Del
physically today.
Looks like ctrl+alt+delete of vnc is not ctrl+alt+delete from the keyboard :-)
You can try to figure out what is sent by calling "xev" and analyse the output.
Should I file a bug about it, or is there any other
explanation for this
behaviour?
Bug in vnc, I'd say ...
Nik
7:19 p.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
That's a
good idea, so I did it. After I sent "Ctrl-Alt-Del" from the
"F8-menu" of xvnc4viewer (when the screen was *not* locked), TDE opened
the "End session for 'ilya'" dialog (with a dragon sleeping on the
moon). And that is not the same dialog as I got by pressing C-A-Del
physically today.
Looks like ctrl+alt+delete of vnc is not ctrl+alt+delete from the keyboard
:-)
You can try to figure out what is sent by calling "xev" and analyse the
output.
> Should I file a bug about it, or is there any other explanation for this
> behaviour?
9:08 p.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
Hi Timothy !
To be honest I don't understand why is this "Ctrl-Alt-Del" dialog window
good for security. What kind of attack is prevented by it?
Cheers,
Ilya
9:31 p.m.
New subject: [trinity-users] avoid "Ctrl-Ald-Del" in screen unlock dialog
Hi Timothy !
To be honest I don't understand why is this "Ctrl-Alt-Del" dialog window
good for security. What kind of attack is prevented by it?
Cheers,
Ilya
Hi Ilya,
Login spoofing. http://en.wikipedia.org/wiki/Login_spoofing
In a nutshell TDE intercepts ctrl+alt+del at a very low level, making it
impossible for a non-privileged user to ever see the keystroke. Two TDE
applications are then granted the ability to see the keystroke,
specifically KDM and the desktop locker. Any other application will be
oblivious to the fact that ctrl+alt+del was pressed, making it impossible
to create a behaviourally accurate copy of the login screen.
Tim
4735
days inactive
4738
days old
15 comments
5 participants
participants (5)
-
Francois Andriot -
Ilya Dogolazky -
Mag. Dr. Nikolaus Klepp -
Neil Youngman -
Timothy Pearson