https://bugs.kde.org/show_bug.cgi?id=357954
Bug ID: 357954
Summary: Sometimes get "unlocking failed" error when using
yubikey with static password
Product: kscreenlocker
Version: 5.5.1
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: minor
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: cnm...@ruggedinbox.com
CC: bhus...@gmail.com, mgraess...@kde.org
While testing a Yubikey configured with a static password (press a button and
the password is automatically typed) over 55 characters, I found that a
unlocking the lock screen fails about 50% of the time (10 failures in 20
attempts).
This appears to be due to the Yubikey entering characters very quickly (over 55
characters in 1 second) that some characters in the password are not typed into
the field.
This has never happened when entering the password from the desktop or when
logging in for the first time after a reboot.
If I copy the password when on the desktop, lock the screen, and paste it into
the password field, it never fails.
If I hit Enter after getting an "unlocking failed" error without clearing the
field and entering it again, it always fails.
While testing, I noticed that this seems to happen in streaks - with it failing
multiple times in a row, then it being ok for several attempts in a row.
Here's the pattern for 20 trials:
2 successful
4 failures
4 successful
3 failures
4 successful
3 failures
Reproducible: Sometimes
Steps to Reproduce:
1. Lock the desktop
2. Use a Yubikey or (maybe) something else that quickly enters a long password
to log back in
https://en.wikipedia.org/wiki/YubiKey
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