https://bugs.kde.org/show_bug.cgi?id=527976
Bug ID: 527976
Summary: FTP MLSD entries without UNIX.mode are marked
read-only (0444), blocking paste and drag-and-drop in
Dolphin
Classification: Frameworks and Libraries
Product: frameworks-kio
Version First 6.31.0
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: FTP
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
DESCRIPTION
Writable FTP directories are marked read-only when Dolphin obtains them from an
MLSD listing without UNIX.mode. The server accepts uploads, but Dolphin blocks
paste and drag-and-drop before attempting the transfer.
STEPS TO REPRODUCE
1. Connect to an Android WiFi FTP Server advertising MLST
Size;Modify;Type;Perm. Its actual MLSD directory entries contain size, modify
and type, but no UNIX.mode or Perm.
2. Browse the parent directory, then enter a writable child directory in
Dolphin.
3. Try to paste or drag a local file into it.
OBSERVED RESULT
Dolphin shows a forbidden drag cursor and reports that there is no permission
to write when pasting.
A KDirLister probe listing the parent reports the child as permissions=0444,
isWritable=false.
Direct FTP STOR and direct kioclient copy to that directory succeed. A direct
KIO stat reports 0755. Instrumenting KFileItem::isWritable in Dolphin recorded
the same directory changing from 0755/true to 0444/false as listing information
was used.
EXPECTED RESULT
Missing permission facts should not become a definitive read-only mode that
prevents operations the server permits.
SOFTWARE/OS VERSIONS
CachyOS Linux
Dolphin 26.08.2-1.1
KIO 6.31.0-1.1
Qt 6.12.0-3.1
SERVER RESPONSE
The target directory's parsed MLSD facts contain size=8192, modify=<timestamp>,
type=dir. Neither UNIX.mode nor Perm is present. Its traditional LIST
permissions are drwx------. Direct STOR succeeds.
SOURCE LOCATION
https://github.com/KDE/kio/blob/v6.31.0/src/kioworkers/ftp/ftp.cpp
FtpInternal::ftpReadDir(), MLSD branch, initializes de.access to S_IRUSR |
S_IRGRP | S_IROTH (0444). Only UNIX.mode replaces it; standard Perm is not
parsed. The direct directory stat path instead synthesizes writable
permissions, explaining the conflicting results.
VALIDATION
An experimental local build of only kio_ftp treated absent permission facts as
unknown/optimistically writable, handled Perm when present, and retained
UNIX.mode precedence. The same live-server parent-directory probe changed from
0444/isWritable=false with the original module to 0700/isWritable=true with the
modified module. A small upload through the modified module was retrieved,
compared successfully, and deleted. This validates the diagnosis, not every
aspect of the experimental patch. No system-wide KDE packages or server
permissions were changed.
DISCLOSURE
This report was drafted with AI assistance. The user supplied the Dolphin error
screenshots; an AI coding assistant inspected the source and ran the
live-server diagnostics and experimental build described above. The
observations are from those tests, not an independently performed human review
of every claim.
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