[qubes-users] Disable lock screen / screenshot question

Shawn_Creighton · December 22, 2020, 5:26pm

How do you disable the automatic screen lock? I have the screensaver disabled and the lock screen option unchecked but it still locks after a few minutes.

Also when using the screenshot function in system tools, is it possible to save to the AppVM file system you are currently using rather than to Dom0? Or how do I access it once it is saved to Dom0?

Jarrah1 · December 22, 2020, 9:18pm

How do you disable the automatic screen lock? I have the screensaver
disabled and the lock screen option unchecked but it still locks after a
few minutes.

For me, there is a "presentation mode" on the battery icon (which shows
on both desktop and laptop) that disables the screen lock.

Also when using the screenshot function in system tools, is it possible to
save to the AppVM file system you are currently using rather than to Dom0?
Or how do I access it once it is saved to Dom0?

You should be able to get them to your AppVM using `qvm-copy-to-vm <vm

haaber · December 23, 2020, 8:14am

Better: create in dom0 a file containing:

#!/bin/bash
qvm-copy-to-vm $zenity \-\-entry \-\-title='Send to VM' \-\-text='Destination VM'$ "{BASH_ARGV[@]}"

Save that as an executable script, such as "~/.local/bin/send-to-vm.sh".
Then, open dom0 file manager, right click any png, click open with other
application, and under "use a custom command" enter "send-to-vm.sh %s".
This "registers" the script in the application list.

Then, when you take a screenshot, instead of choosing "save", choose
"open with..." and see if your script shows up in the list of available
applications. If still not, you might have to write a simple .desktop
file in ~/.local/share/applications in order for it to show
up as an option.

Ulrich_Windl · December 29, 2020, 6:02pm

How do you disable the automatic screen lock? I have the screensaver
disabled and the lock screen option unchecked but it still locks after a
few minutes.

For me, there is a "presentation mode" on the battery icon (which shows
on both desktop and laptop) that disables the screen lock.

Also when using the screenshot function in system tools, is it possible to
save to the AppVM file system you are currently using rather than to Dom0?
Or how do I access it once it is saved to Dom0?

You should be able to get them to your AppVM using `qvm-copy-to-vm <vm
> <filename>` from the terminal.

Better: create in dom0 a file containing:

#!/bin/bash
qvm-copy-to-vm $(zenity --entry --title='Send to VM' --text='Destination
VM') "${BASH_ARGV[@]}"

Save that as an executable script, such as "~/.local/bin/send-to-vm.sh".
Then, open dom0 file manager, right click any png, click open with other
application, and under "use a custom command" enter "send-to-vm.sh %s".

When trying, it seems my Dom0 does not have a file manager in the menu. I had to run "thunar" manually from the terminal.

Also: Wouldn't qvm-move-to-vm be preferrable (also replacing "Send" with "Move")?

haaber · December 29, 2020, 7:23pm

Better: create in dom0 a file containing:

#!/bin/bash
qvm-copy-to-vm $(zenity --entry --title='Send to VM' --text='Destination
VM') "${BASH_ARGV[@]}"

Save that as an executable script, such as "~/.local/bin/send-to-vm.sh".
Then, open dom0 file manager, right click any png, click open with other
application, and under "use a custom command" enter "send-to-vm.sh %s".

When trying, it seems my Dom0 does not have a file manager in the menu.
I had to run "thunar" manually from the terminal.

you are right.

Also: Wouldn't qvm-move-to-vm be preferrable (also replacing "Send" with
"Move")?

you are right again. It was a "proof of concept" code. Thank you for the
correction!

This "registers" the script in the application list.

Then, when you take a screenshot, instead of choosing "save", choose
"open with..." and see if your script shows up in the list of available
applications. If still not, you might have to write a simple .desktop
file in ~/.local/share/applications in order for it to show
up as an option.

Or write it by hand: like
~/.local/share/applications/userapp-screenshot.desktop containing

[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
NoDisplay=true
Exec=/home/user/.local/bin/send-to-vm.sh %f
Name=Send a screenshot to VM
Comment=Custom definition for SCREENSHOT.sh

cheers

adw · December 30, 2020, 7:20am

This is by design. Using a file manager in dom0 is a security risk and is therefore discouraged:

github.com

Qubes-Community/Contents/blob/master/docs/security/security-guidelines.md#dom0-precautions


Security Guidelines
===================

Without some active and responsible participation of the user, no real security is possible. Running Firefox inside of an AppVM does not automagically make it (or any other app) more secure. 
Programs themselves remain just as secure [(or insecure)](https://en.wikipedia.org/wiki/Computer_insecurity) on Qubes as on a normal Linux or Windows OS. 
What drastically changes is the context in which your applications are used. 
[This context](https://www.qubes-os.org/doc/qubes-architecture/) is a [responsibility of the user](https://www.qubes-os.org/security/goals/). 
But managing security in this context well requires knowledge of some new concepts and procedures. So it is worth stressing some basic items:

Download Verification
---------------------

**Verify the authenticity and integrity of your downloads, [particularly the Qubes iso](https://www.qubes-os.org/security/verifying-signatures/).**

The internet is always a dangerous place. 
While your connection to the Qubes website and download mirrors is encrypted, meaning that your downloads from here can't be modified by a third party en route, there is always the chance that these websites themselves have been compromised. 
Signature verification allows us to validate for ourselves that these files were the ones authored and signed by their creators (in this case the Qubes development team). 

Because it's so easy for a hacker who manages to tamper with the downloaded iso files this way to patch in malware, it is of the utmost importance that you **verify the signature of the Qubes iso** you use to install Qubes.

This file has been truncated. show original

Ulrich_Windl · January 2, 2021, 5:05pm

[...]
When trying, it seems my Dom0 does not have a file manager in the menu. I had to run "thunar" manually from the terminal.

This is by design. Using a file manager in dom0 is a security risk and is therefore discouraged:

Contents/docs/security/security-guidelines.md at master · Qubes-Community/Contents · GitHub

So is there an alternative that gets the user script registered for saving a screenshot?

adw · January 2, 2021, 8:31pm

I'm not sure exactly what you mean, but there's:

Ulrich_Windl · January 6, 2021, 5:03pm

[...]
When trying, it seems my Dom0 does not have a file manager in the menu. I had to run "thunar" manually from the terminal.

This is by design. Using a file manager in dom0 is a security risk and is therefore discouraged:

Contents/docs/security/security-guidelines.md at master · Qubes-Community/Contents · GitHub

So is there an alternative that gets the user script registered for saving a screenshot?

I'm not sure exactly what you mean, but there's:

I mean: It seems you need the file manager to open the file just to register it as handler; is there an alternative not using the file manager?

[Contribution] qvm-screenshot-tool · Issue #953 · QubesOS/qubes-issues · GitHub

Unfortunately the issue is quite long, and you are not referring to a specific comment...

haaber · January 7, 2021, 9:21am

I'm not sure exactly what you mean, but there's:

I mean: It seems you need the file manager to open the file just to
register it as handler; is there an alternative not using the file manager?

not that I know. But you can register it "by hand" by creating a .dsktop
file yourself (as I explained earlier). Put these lines

[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
NoDisplay=true
Exec=/home/user/.local/bin/send-to-vm.sh %f
Name=Send a screenshot to VM
Comment=Custom definition for send-to-vm.sh

in a new file in ~/.local/share/applications/userapp-screenshot.desktop

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