NFS Labels

[Daniel J Walsh]

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On 07/13/2013 02:15 PM, Jorge Fábregas wrote:
> Hi,
> 
> In the nfsd_selinux man page it mentions:
> 
> nfsd_ro_t nfsd_rw_t
> 
> ...which might give you the impression that those are the labels you might
> use for your shares. I tried them and the client could mount the shares
> read-write (regardless of the label on the server). Clearly they don't work
> or perhaps I'm using them in an unintended way.
> 
> After searching the mailing list I found out that, since nfs mainly runs as
> a kernel module, SELinux can't control it.  Apparently that's also the
> reason the read-only and read-write booleans were removed.  I'm now 
> wondering:
> 
> Did NFS used to run as a daemon in the past?
> 
> Since NFS  is practically unconfined, what are the nfsd_ro_t and rw_t 
> labels for?
> 
> Thanks!
> 
They should be removed, they are not used and make no sense since nfs is built
into the kernel.  I believe the idea years ago was to allow an admin to
specify which files could be shared via NFS read only and which could be
shared read/write.


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