[PATCH] Two dependent bugfixes for VSS bugs 13455 and 13688

[Jeremy Allison]

On Fri, Nov 23, 2018 at 12:45:47PM -0800, Jeremy Allison via samba-technical wrote:
> Ralph, I thin [PATCH 09/10] s3:smbd: GMT token handling on paths: prefix, don't append
> is incorrect.
> 
> We used to do this, but found it breaks pathnames with a MS-DFS
> prefix (such as \\server\share\path).
> 
> If you haven't already, please check this code against a
> server set up with MS-DFS pathnames.
> 
> If you don't have time before then, let's talk when I'm back in at
> work on Monday.
> > 
> > The ':' after "foor" sets stream_started to true, then the '\' after
> > "stream" triggers the error.
> > 
> > Fix: prepend the GMT token to the path, that's what we're later doing in
> > canonicalize_snapshot_path() anyway. For the above example that results

Note that canonicalize_snapshot_path() is called *after* any MS-DFS
processing is done, which is why it's safe to do that there.

I think the correct fix here is to search in the SMB2 create
code for a ':' character and if found, insert the @GMT token
before that, otherwise append as we're currently doing.

This will leave the MS-DFS processing working I think.

Jeremy.