SELinux ntfs-mount context

[chritallic <christoph.semken@xxxxxxxxx>]

Hey there,

I have a problem with an ntfs partition and it’s selinux context.

First of all I use the ntfs partition to store all my data. This
includes openvpn secrets. But as the ntfs gets a
system_u:object_r:fusefs_t:s0 context, selinux prevents openvpn from
opening the certificate.

> type=AVC msg=audit(1339236971.22:90): avc:  denied  { read } for  pid=1689 comm="openvpn" name="mycert.crt" dev="sda5" ino=1729 scontext=system_u:system_r:openvpn_t:s0 tcontext=system_u:object_r:fusefs_t:s0 tclass=file

Now, instead of allowing every single app to access fusefs_t, I’d rather
like to give the files the right context. Changing the context, however,
doesn’t seem to be possible on ntfs:

> $ chcon -t "default_t" /data
> chcon: failed to change context of `/data' to `system_u:object_r:default_t:s0': Operation not supported

I then tried to mount the partition using the context option. But that
did work either:

> $ mount -o context="system_u:object_r:user_home_t:s0" /dev/sda5 /data
> ntfs-3g-mount: mount failed: Invalid argument
> $ mount -o context="system_u:object_r:user_home_t:s0",default /dev/sda5 /data
> ntfs-3g-mount: mount failed: Invalid argument

Oddly enough, another user reported this syntax to work in the thread
“[OT] how to share a directory under ntfs mount point with selinux
enabled?“:

> OK. Walking through other documents I found that the "correct" syntax
> is with a ":s0" at the end of the option, and also add defaults at the
> end, like:
> 
> context=system_u:object_r:samba_share_t:s0,defaults
> 
> This way I can correctly mount a share against a directory under the ntfs tree

Does anybody now how to mount the partition correctly? Or even better:
is there a possibility to set the context of ntfs files?

Thanks,
chritallic

PS: I’m new to selinux, so my apologies if there is something really
dumb in here. ;-)
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