bugzilla-daemon at bugzilla.mindrot.org
2019-Apr-11 08:59 UTC
[Bug 2992] New: quota-support for statvfs@openssh.com extension in sftp-server
https://bugzilla.mindrot.org/show_bug.cgi?id=2992
Bug ID: 2992
Summary: quota-support for statvfs at openssh.com extension in
sftp-server
Product: Portable OpenSSH
Version: -current
Hardware: ix86
OS: Linux
Status: NEW
Severity: enhancement
Priority: P5
Component: sftp-server
Assignee: unassigned-bugs at mindrot.org
Reporter: anders.henke at 1und1.de
Since OpenSSH 5.1, OpenSSH's sftp-server does support a
openssh-specific extension to query for file system statistics (#1399).
This feature is nice for users accessing their own filesystem (e.g.
user's home is located on a distinct, size-limited ZFS filesystem).
There are also many other cases (CDN push zones, file or web hosting)
where the user is hosted on a shared, quota-enabled filesystem
(UFS/FFS, NFS, EXT3/4, XFS,?) and so this information is less
meaningful to the user and may easily result in mis-assumptions.
For example, a user might assume sftp's "df" output represents
information not on the actual filesystem, but on their specific own
account: they'd either spot plenty of space available (even though they
might be running short on quota) or wonder why their almost-empty
account is consuming terabytes of space, assuming "some malware" or
"being hacked".
I do suggest an option to configure the behavior of the sftp-server's
statvfs-extension:
- report statvfs information (default, current behavior)
- report current user's (soft) user quota usage and limits
- report current user's (soft) group quota usage and limits
Introducing such an option enables a system administrator to configure
sftp-server according to the specific storage subsystem and the
system's configuration. By doing so, the statfs-extension becomes much
more useful to sftp users accessing shared, quota-enabled filesystems.
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