Bug 440055

Summary:	Can't unlock the screen if the user has an empty password
Product:	[Plasma] kscreenlocker	Reporter:	Graham Perrin <grahamperrin>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED FIXED
Severity:	critical	CC:	andrej, bhush94, kde, nate, palmadaniel196, thuryn1
Priority:	VHI
Version:	unspecified
Target Milestone:	---
Platform:	Other
OS:	FreeBSD
Latest Commit:	https://invent.kde.org/plasma/plasma-workspace/commit/dc6341bb3073ebe0beb945018cc7bb67ee2dd828	Version Fixed In:	5.25
Sentry Crash Report:

Description Graham Perrin 2021-07-20 03:08:12 UTC

SUMMARY

I guess, the logic here should be to not allow locking where there's no password. 

STEPS TO REPRODUCE

1. Log in as a user with an empty password
2. after a while, find the screen locked
3. attempt to unlock without entering a password

OBSERVED RESULT

4. the screen remains locked

EXPECTED RESULT

4. unlock

SOFTWARE/OS VERSIONS

% pkg info -x kscreenlock
plasma5-kscreenlocker-5.22.3_1
% 

Operating System: FreeBSD 14.0
KDE Plasma Version: 5.22.3
KDE Frameworks Version: 5.83.0
Qt Version: 5.15.2
Kernel Version: 14.0-CURRENT (64-bit)
Graphics Platform: X11
Memory: 15.9 GiB of RAM
Graphics Processor: AMD TURKS

ADDITIONAL INFORMATION

Comment 1 David Redondo 2021-07-28 06:49:42 UTC

*** Bug 440344 has been marked as a duplicate of this bug. ***

Comment 2 Nate Graham 2021-08-05 01:03:52 UTC

Eek. Can confirm.

Comment 3 Graham Perrin 2021-08-30 05:26:10 UTC

Does SDDM have an impact?

For example: 

Passwordless Login · Issue #751 · sddm/sddm
<https://github.com/sddm/sddm/issues/751>

Comment 4 David Edmundson 2022-05-14 18:59:57 UTC

The behaviour is now changed - but not perfect (hence leaving this open) it now unlocks immediately on resume from the "screensaver" mode.

Comment 5 David Edmundson 2022-05-18 11:17:02 UTC

Git commit dc6341bb3073ebe0beb945018cc7bb67ee2dd828 by David Edmundson.
Committed on 18/05/2022 at 11:09.
Pushed by davidedmundson into branch 'master'.

Add an explicit unlock button for passwordless users

In the refactor we correctly made it so passwordless users were not
prompted for passwords.

This is in the right direction but the UX was still slightly off as it
meant wiggling the mouse unlocked the screen, not an explicit action.

This patch adds an explicit button that must be pressed if no other
prompts were given during the authentication process.

M  +10   -1    lookandfeel/contents/lockscreen/LockScreenUi.qml
A  +23   -0    lookandfeel/contents/lockscreen/NoPasswordUnlock.qml     [License: GPL(v2.0+)]

https://invent.kde.org/plasma/plasma-workspace/commit/dc6341bb3073ebe0beb945018cc7bb67ee2dd828

Comment 6 Tomas 2022-07-13 14:17:28 UTC

Solution of this bug is not good. I use Howdy for face unlocking and it worked fine before. I get annoying screen with Unlock button now. Moreover, if I connect second screen I get second screen with Unclock button. So it would be great to revert this change.

Comment 7 Nate Graham 2022-07-13 17:13:01 UTC

The first issue is Bug 454706, and the second issue should be fixed with Plasma 5.25.3.1. If it's not, please file a new bug report.