[dolphin] [Bug 488752] New: Dolphin fails to connect to remote server via SFTP with ed25519-sk key

[Tyler Gautney]

https://bugs.kde.org/show_bug.cgi?id=488752

            Bug ID: 488752
           Summary: Dolphin fails to connect to remote server via SFTP
                    with ed25519-sk key
    Classification: Applications
           Product: dolphin
           Version: 24.05.0
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: bars: location
          Assignee: dolphin-bugs-null at kde.org
          Reporter: tyler.gautney at linuxdragon.dev
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 170646
  --> https://bugs.kde.org/attachment.cgi?id=170646&action=edit
Dolphin SFTP logs

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SUMMARY


STEPS TO REPRODUCE
1. Create an SSH key pair of ed25519-sk type. You'll need a hardware security
key.
2. Upload public key to remote device. 
3. Disable SSH password authentication on the remote device.
4. Insert hardware security key registered with the SSH key pair.
5. Connect to the remote device by entering sftp://remote_device_ip_address in
the location bar of Dolphin. In my case, remote device has the same username as
the client; so there is no need to provide a username.

OBSERVED RESULT
A red banner appears in Dolphin with the text "Authentication failed."

EXPECTED RESULT
Dolphin prompts for the user to confirm user presence. With the key. User
touches the security key, and is logged into the graphical SFTP session.

SOFTWARE/OS VERSIONS
Windows: N/A
macOS: N/A
Linux/KDE Plasma: Fedora Linux 40
(available in About System)
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1

ADDITIONAL INFORMATION
I first reported this issue on the forum:
https://discuss.kde.org/t/sftp-authentication-fails-on-dolphin/7770. (Please
note, at the time, I was still running Plasma 5.) Today, I ran Dolphin again
with the command suggested by luisbocanegra in the second post,
`KIO_SFTP_LOG_VERBOSITY=10 KDE_FORK_SLAVES=1
QT_LOGGING_RULES="log_kio_sftp=true;kf.kio.workers.sftp=true;" dolphin
--new-window sftp://192.168.57.3`. I've attached the output in a text file.

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