SMB3 POSIX and deleting files with FILE_ATTRIBUTE_READONLY

[Ralph Boehme]

As discussed at SambaXP, what about this?

https://gitlab.com/samba-team/smb3-posix-spec/-/merge_requests/6/diffs

On 4/9/25 8:18 PM, Ralph Boehme via samba-technical wrote:
> Hi folks,
> 
> what should be the behavior with SMB3 POSIX when a POSIX client tries to 
> delete a file that has FILE_ATTRIBUTE_READONLY set?
> 
> The major question that we must answer is, if this we would want to 
> allow for POSIX clients to ignore this in some way: either completely 
> ignore it on POSIX handles or first check if the handle has requested 
> and been granted WRITE_ATTRIBUTES access.
> 
> Checking WRITE_ATTRIBUTES first means we would correctly honor 
> permissions and the client could have removed FILE_ATTRIBUTE_READONLY 
> anyway to then remove the file.
> 
> Windows has some new bits FILE_DISPOSITION_IGNORE_READONLY_ATTRIBUTE to 
> handle this locally (!) and it seems to be doing it without checking 
> WRITE_ATTRIBUTES on the server.
> 
> <https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms- 
> fscc/2e860264-018a-47b3-8555-565a13b35a45>
> 
> Thoughts?
> 
> Thanks!
> -slow

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