[OpenAFS] FUSE on Windows to satisfy Microsoft certification

[Jeffrey Altman]

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On 4/8/2015 10:34 AM, Edgecombe, Jason wrote:
> Hi everyone,
>=20
> OpenAFS isn't the only open source file system that will be locked out =
of Windows by Microsoft's new certification requirements. Quite a few of =
these file systems rely on the FUSE interface. There seems to be a FUSE i=
nterface for windows. I don't know if Microsoft would certify the shim-li=
ke interface of FUSE, but I could see one of the open source foundations =
or big open source companies, like RedHat, supporting the cost of certify=
ing a FUSE driver for windows. I'm thinking that the larger user-base of =
FUSE might cause that to happen.  I understand that OpenAFS has a neglect=
ed FUSE driver, but I'm wondering if that's a workable option going forwa=
rd.
>=20
> Thoughts?

I suspect that certifying FUSE would be quite a bit of effort. In the
eight years that I have attended the IFS Plugfest events there has never
been anyone testing a FUSE driver or another open source file system.

The AFS redirector is a full fledged redirector because that is the only
method of integrating with Windows with the same level of functionality
that NTFS and CIFS have.  Microsoft does support mini-redirector based
file systems via Redirected Drive Buffering Subsystem (RDBSS).  RDBSS
and FUSE would both significantly limit the possible integration.

Support for authentication group based token management, authentication
group access via impersonation, support for roaming profiles and
redirected folders, and network drive mapping and browsing are a few of
the areas which would prove challenging if not impossible to implement
via RDBSS or FUSE.

I also doubt that Red Hat, which does not sign the Cygwin setup.exe,
would be willing to sign a file system driver permitting third parties
to ship plugins that bypass the Microsoft security model.  Red Hat does
not sign the setup.exe because putting Red Hat's name and signature on
the executable would convey an association between Red Hat and the
"community contributed executables" which are installed by it.  See the
recent discussion on the cygwin@cygwin.com mailing list: "Should
cygwin's setup*.exe be signed using Sign Tool?".

Jeffrey Altman



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