NFS-mounted home directory and dbus

[Arkady]

I definitely have write access to my home directory--but I lose read and
write access when I become a superuser. Yes, that seems strange to me too,
but our former sysadmin told me this is how things are supposed to be for
remotely mounted filesystems. Maybe he misunderstood.

I do not have superuser access on the ldap/fileserver.

I am running kde as my own self. If, in startkde, I add a line printing the
user running the script, it's myself.

startkde also has a line in it which evals the following command:

$ dbus-launch --sh-syntax --exit-with-session
DBUS_SESSION_BUS_ADDRESS='unix:abstract=/tmp/dbus-mPVsi5pTYf,guid=b0d4c9865e166308b1fd67dd48348990';
export DBUS_SESSION_BUS_ADDRESS;
DBUS_SESSION_BUS_PID=25584;
DBUS_SESSION_BUS_WINDOWID=16777217;

Then, the following startkde line calls qdbus:
$ qdbus
:1.0
org.freedesktop.DBus

As you can see, both commands work fine when I run them myself, but from
within startkde--despite the fact that printing `whoami` gives my own
username--the command gives no output. As a result, qdbus doesn't work, and
kde fails to start.

I'm guessing this is a funky permissions issue due to the ldap auth.

John


On Wed, May 21, 2008 at 12:18 PM, Shawn Rutledge <shawn.t.rutledge at gmail.com>
wrote:

> On Wed, May 21, 2008 at 10:01 AM, Arkady <bamboowarrior at gmail.com> wrote:
> > I'm a bit of a n00b, but I RTFM'd to the best of my ability. As testament
> to
> > my n00bness, I only just learned that if you've got a remotely mounted
> > directory, you can't access it when you're superuser (even with sudo,
> even
> > read-only). I think this may be contributing to my dbus woes.
>
> That's weird.  Sounds like you need to troubleshoot that.  The
> no_root_squash option (which would be in /etc/exports on the NFS
> server) would ensure that if you are root on the client you are root
> on the server too, but can be a security hole depending on the context
> (if all the users are trusted, you probably don't care).  But there is
> more to it than that; I wouldn't expect to lose privileges by becoming
> root, that you had as a regular user.  But you are running KDE as a
> regular user right?  Doesn't that user have write permission to his
> own NFS-mounted home directory?
>
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