[Bug 1953] Implementation of xattr in sftp-server for sshfs

[bugzilla-daemon]

https://bugzilla.mindrot.org/show_bug.cgi?id=1953

--- Comment #11 from Christoph Anton Mitterer  ---
Yes I know that this has already been rejected ;-) ... but under the
light of scp now getting SFTP under the hood... is there any
willingness from upstream side to reconsider this?


With SFTP being much easier extensible, scp could eventually become a
true/full cp, ... by supporting stuff that's currently ignored (like
here the XATTRs and thus ACLs)... and maybe in the future even file
owners (of course only with the respective capabilities and if there is
a mapping of names).

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[Bug 1953] Implementation of xattr in sftp-server for sshfs

[bugzilla-daemon]

https://bugzilla.mindrot.org/show_bug.cgi?id=1953

Damien Miller  changed:

   What|Removed |Added

 Status|RESOLVED|CLOSED

--- Comment #10 from Damien Miller  ---
Close all resolved bugs after 7.3p1 release

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[Bug 1953] Implementation of xattr in sftp-server for sshfs

[bugzilla-daemon]

https://bugzilla.mindrot.org/show_bug.cgi?id=1953

--- Comment #9 from Christoph Anton Mitterer  ---
Especially since Eberhard's patch doesn't them *that* intrusive to
other parts of openssh, wouldn't simply be possible to use something
like RFC 2389,... so server and client could negotiate whether things
beyond the basic features are supported and XATTRs support would only
be enabled then... that should at least solve most compatibility
worries.

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[Bug 1953] Implementation of xattr in sftp-server for sshfs

[bugzilla-daemon]

https://bugzilla.mindrot.org/show_bug.cgi?id=1953

--- Comment #8 from Christoph Anton Mitterer  ---
What a pity... it seemed to be something quite useful for many cases.

AFAIU, the only reason not to support it was staying at the base level
of the sftp "standard"... however, OpenSSH goes in so many places way
beyond the standards...

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[Bug 1953] Implementation of xattr in sftp-server for sshfs

[bugzilla-daemon]

https://bugzilla.mindrot.org/show_bug.cgi?id=1953

Damien Miller  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution|--- |WONTFIX

--- Comment #7 from Damien Miller  ---
We don't have any desire to implement xattr support in sftp, sorry. If
you need it, you might want to consider an alternate sftp-server.

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[Bug 1953] Implementation of xattr in sftp-server for sshfs

[bugzilla-daemon]

https://bugzilla.mindrot.org/show_bug.cgi?id=1953

TJ Saunders  changed:

   What|Removed |Added

 CC||t...@castaglia.org

--- Comment #6 from TJ Saunders  ---
Instead of using custom SFTP extensions for xattr functionality,
another approach you might consider, protocol-wise, is the use of the
SSH_FILEXFER_ATTR_EXTENDED flag of the ATTRS structure, which is part
of SFTP protocol version 3 (and earlier); see:

  https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-5

SFTP clients can send xattrs as ATTR_EXTENDED key/value pairs in
SETSTAT/FSETSTAT requests; OpenSSH should send the xattrs in READDIR
and STAT et al requests the same way.

This would still require patching OpenSSH's SFTP server to use the
platform-specific extended attribute APIs (extattr(9) for BSDs,
xattr(8) for Linux, with Mac providing something similar to Linux but
with different function signatures).

It would also leave open the question of how an SFTP client could
_remove_ an extended attribute from a file; the Draft for SFTP does not
provide a way of doing so.  One MIGHT argue for a SETSTAT request that
contains an attribute name with an empty value as a signal that that
extended attribute should be deleted.

With the above approach, xattr support might benefit more existing
clients (and servers) than the approach using custom OpenSSH-specific
extensions.

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[Bug 1953] Implementation of xattr in sftp-server for sshfs

[bugzilla-daemon]

https://bugzilla.mindrot.org/show_bug.cgi?id=1953

Stef Bon  changed:

   What|Removed |Added

 CC||stef...@gmail.com

--- Comment #5 from Stef Bon  ---
I agree with others: xattr support would be very good. I'm working on a
FUSE fs using libssh2, and the filesystem would benefit a lot when
xattr are supported.

Why the patch is not accepted? Maybe there is a reason apart from
"Keeping it simple was one of the motivations for not implementing
features from draft-filexfer versions > 2". 

Xattr support is already supported by Linxu for years, and is not hard
to implement. It's just a simple get/set mechanism. So I'm very pro for
adding this feature.

Please reconsider the possibility to add this.

Stef Bon
the Netherlands

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[Bug 1953] Implementation of xattr in sftp-server for sshfs

[bugzilla-daemon]

https://bugzilla.mindrot.org/show_bug.cgi?id=1953

Christoph Anton Mitterer cales...@scientia.net changed:

   What|Removed |Added

 CC||cales...@scientia.net

--- Comment #2 from Christoph Anton Mitterer cales...@scientia.net ---
Hi Daimen.

I think we recently had a small talk in some other enhancement I've
requested (interactiveness of scp), where you said scp can't easily
enhanced... but such things should be doable with sftp.


May I therefore draw your attention on this again?

I think XATTR/ACL support is really really important and would be great
to see in OpenSSH.
Actually the only feature I recall right now, that I'd anticipate even
more is #1926.

Especially sshfs would benefit greatly from ACL/XATTR support in
openssh.


I know people often turn down ACLs/XATTRs because they consider them
not widely used/supported... but that attitude is mainly the reason why
this doesn't change.


So hopefully this will accepted in ssh :-)


Cheers,
Chris.

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[Bug 1953] Implementation of xattr in sftp-server for sshfs

[bugzilla-daemon]

https://bugzilla.mindrot.org/show_bug.cgi?id=1953

Damien Miller d...@mindrot.org changed:

   What|Removed |Added

 CC||d...@mindrot.org

--- Comment #1 from Damien Miller d...@mindrot.org 2011-12-02 10:48:41 EST ---
I'm not sure we want to go beyond basic POSIX in our sftp. Keeping it
simple was one of the motivations for not implementing features from
draft-filexfer versions  2

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