Date: Tue, 19 Apr 2005 17:35:56 +0200 From: cpghost@cordula.ws To: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> Cc: Florian Hengstberger <e0025265@student.tuwien.ac.at> Subject: Re: which interface: mountd,rpcbind Message-ID: <20050419153556.GA60313@epia2.farid-hajji.net> In-Reply-To: <44ekd8z0xb.fsf@be-well.ilk.org> References: <if1ro5.icuujw@webmail.tuwien.ac.at> <44ekd8z0xb.fsf@be-well.ilk.org>
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On Mon, Apr 18, 2005 at 09:09:36AM -0400, Lowell Gilbert wrote: > "Florian Hengstberger" <e0025265@student.tuwien.ac.at> writes: > > > Hi! > > I really worry about that it seems (man mountd, man rpcbind) > > impossible to specifiy the interface these daemons bind to. I've had exactly the same problem a while ago! The important thing here, is that nfsd doesn't bind to INADDR_ANY. The other daemons are still potentially vulnerable to other kinds of attacks though, but it would be extremely difficult to inject NFS RPCs into this system from an external interface. I wished rpcbind and mountd (and rpc.lockd and rpc.statd!) could be configured to listen on a specific interface. As long as that is not implemented, you should really use pf or another packet filter on your external interface, to protect NFS. > You can't, as far as I can see. Looks like it would be an afternoon's > work to add it in, but I wouldn't think it's worth worrying about it. Yes please, it would be really nice to have this in the source. If I knew more sockets API, I would have already submitted a PR for this, but I don't :(. It's just a matter of adding calls to bind(2) at the right places. > Since you bind to an address already, a packet filter firewall will > protect you from access on the wrong interface. Hmmm, rpcbind, mountd, rpc.lockd and rpc.statd bind to INADDR_ANY, not to a specific interface. rpcbind has even a documented -h flag, that it doesn't seem to respect fully. That's exactly the problem. Regards, -cpghost. -- Cordula's Web. http://www.cordula.ws/
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