[kio] [Bug 341514] New: Dolphin fails to mount CIFS 3 share

[Shmerl]

https://bugs.kde.org/show_bug.cgi?id=341514

            Bug ID: 341514
           Summary: Dolphin fails to mount CIFS 3 share
           Product: kio
           Version: unspecified
          Platform: Debian testing
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: smb
          Assignee: unassigned-bugs at kde.org
          Reporter: shtetldik at gmail.com

Recent versions of Windows servers (2012 and later) introduced a new version of
CIFS (SMB) protocol used for shared drives (CIFS 3). In order to mount such
shares using mount, one has to pass CIFS version explicitly, for example:

    mount -t cifs -o vers=3.0,uid=<user>,gid=<group>,user=<cifs_user>
//server/share <where_to_mount>

However opening such share from Dolphin (4.14.2) simply using
smb://server/share fails apparently because Dolphin doesm't pick the right CIFS
version (mount also fails if version is not explicitly specified). Kio/smb
should have some way either to detect CIFS version or to allow user to set it
explicitly.

Reproducible: Always

Steps to Reproduce:
1. Open CIFS 3 share in Dolphin using URI like: smb://server/share
2. Input credentials


Actual Results:  
Opening the share fails with bad authentication even though credentials are
correct.

Expected Results:  
The share should be opened.

It's related to changes introduced in CIFS 3.

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