[ceph-users] UID Restrictions

Keane Wolter wolterk at umich.edu
Wed Nov 1 09:57:48 PDT 2017

Acting as UID 100026, I am able to successfully run ceph-fuse and mount the
filesystem. However, as soon as I try to write a file as UID 100026, I get
permission denied, but I am able to write to disk as root without issue. I
am looking for the inverse of this. I want to write changes to disk as UID
100026, but not as root. From what I understood in the email at
2017-February/016173.html, I should be able to do so with the following
cephx caps set to "caps: [mds] allow r, allow rw path=/user uid=100026". Am
I wrong with this assumption or is there something else at play I am not
aware of?


On Wed, Oct 25, 2017 at 5:52 AM, Gregory Farnum <gfarnum at redhat.com> wrote:

> On Mon, Oct 23, 2017 at 5:03 PM Keane Wolter <wolterk at umich.edu> wrote:
>> Hi Gregory,
>> I did set the cephx caps for the client to:
>> caps: [mds] allow r, allow rw uid=100026 path=/user, allow rw
>> path=/project
> So you’ve got three different permission granting clauses here:
> 1) allows the client to read anything
> 2) allows the client to act as uid 100026 in the path /user
> 3) allows the user to do any read or write (as any user) in path /project
> caps: [mon] allow r
>> caps: [osd] allow rw pool=cephfs_osiris, allow rw pool=cephfs_users
>> Keane
>> On Fri, Oct 20, 2017 at 5:35 PM, Gregory Farnum <gfarnum at redhat.com>
>> wrote:
>>> What did you actually set the cephx caps to for that client?
>>> On Fri, Oct 20, 2017 at 8:01 AM Keane Wolter <wolterk at umich.edu> wrote:
>>>> Hello all,
>>>> I am trying to limit what uid/gid a client is allowed to run as
>>>> (similar to NFS' root squashing). I have referenced this email,
>>>> http://lists.ceph.com/pipermail/ceph-users-ceph.com/2017-
>>>> February/016173.html, with no success.  After generating the keyring,
>>>> moving it to a client machine, and mounting the filesystem with ceph-fuse,
>>>> I am still able to create files with the UID and GID of root.
>>>> Is there something I am missing or can do to prevent root from working
>>>> with a ceph-fuse mounted filesystem?
>>>> Thanks,
>>>> Keane
>>>> wolterk at umich.edu
>>>> _______________________________________________
>>>> ceph-users mailing list
>>>> ceph-users at lists.ceph.com
>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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