Date: Thu, 01 Dec 2022 09:42:19 -0800 From: Chris <bsd-lists@bsdforge.com> To: Alan Somers <asomers@freebsd.org> Cc: Rick Macklem <rick.macklem@gmail.com>, Peter Eriksson <pen@lysator.liu.se>, FreeBSD CURRENT <freebsd-current@freebsd.org>, "Bjoern A. Zeeb" <bz@freebsd.org> Subject: Re: RFC: nfsd in a vnet jail Message-ID: <5b062f8a6e4edee98004cd6e4cc394d4@bsdforge.com> In-Reply-To: <CAOtMX2jTSMVebzvB0kCoBPUwrrN19GWyfHLbSk2w6ifoj75GSw@mail.gmail.com> References: <CAM5tNy7CQaBTRWG0m0aN6T0xG2L2zSQJGa%2BatGaH%2BmW%2BwEpdyQ@mail.gmail.com> <CAOtMX2hxeeNMxxdpma8NJ7ms60eRfuCWoFi7FixdSe83=qibkA@mail.gmail.com> <82103A1E-9D39-47B0-9520-205583C8B680@lysator.liu.se> <CAM5tNy71UAOkCQb9upc_OxhM-y5rp9jMKbKTJr619JFCGsfRkg@mail.gmail.com> <2980bcbd22f884962d358808f9440d77@bsdforge.com> <CAOtMX2jTSMVebzvB0kCoBPUwrrN19GWyfHLbSk2w6ifoj75GSw@mail.gmail.com>
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--=_d43b3aada8b86d168847bfc6ce465640 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; format=flowed On 2022-12-01 08:37, Alan Somers wrote: >> I don't care for any of it. It looks like additional overhead with the >> addition of potential security risks. All for a very limited (and as yet >> unknown) use case. > > Here's an example of a real-world use case. I'm responsible for > supporting multiple products involving NFS, iSCSI, and other > protocols. For security reasons, each product is placed on its own > VLAN. Sometimes it's not practical to dedicate a physical server to a > single product, so I have to double-up. For the products that don't > involve NFS or iSCSI, I place them in a VNET jail. That way their > processes can only access the correct VLAN. But NFS and iSCSI can't > (yet) be jailed, so those products need to be served by JID 0. > Therefore, those products' processes can access each other's VLANs. > Clearly that's not ideal. > > Jailing different products is also good for manageability. It's > easier to manage the list of packages that must be installed for each > product, config file settings, etc. For example, some of our NFS > products require vfs.nfsd.enable_stringtouid=1, but others could work > without it. Right now, we're forced to turn it on for all products. OK. I can see that. Assuming I understand your intent correctly, I might choose bhyve(8) for that. Tho that *would* be a little more expensive. I rely on jail(8) daily. They're cheap, fast && easy. As yet, I've never had unreasonable concern for security. The proposed change looks like a potentially high addition of overhead (jail not so cheap now?). RPC && NFS are not cheap && have a comparatively high attack surface. So I guess my concerns/view are affected by this understanding. Thanks for the clarification, Alan. --chris > > -Alan --=_d43b3aada8b86d168847bfc6ce465640 Content-Transfer-Encoding: 7bit Content-Type: application/pgp-keys; name=0xBDE49540.asc Content-Disposition: attachment; filename=0xBDE49540.asc; size=5028 -----BEGIN PGP PUBLIC KEY BLOCK----- mQENBGDTzGEBCADHlXdS4V57s2soaEK2wi3o9rr9zo7to/giBSxCpFYJxOnPkL5A 2ibbvflrL8sWvAczx47wgDS7iIhzICBBRdnXtcFGnoeeriV27LSn+PcpnIB+DaWZ xe+6TDC0Z0JUJ7qDTjUBFzhnQGYlrVvc4WbnWTjJaB1LEwgIX8JqX5S3SX0/oXgs +OtqDuENZ4/a5te5xPnspTv/5NJHjqYGxjHP0Vw0KjRKS1AoJ1SBPSMQV5373AX9 5NzFS+CjqeQhjfHFPeRajQ8t4T6eqhKA7LtKMO1egeAwNehk9ZoEqEBT2+ojuKUd oSuzqvhhx+eUIYLFqoPSzMKR+YbStzergsbnABEBAAG0KUNocmlzIEh1dGNoaW5z b24gPGNocmlzaEB1bHRpbWF0ZWRucy5uZXQ+iQFrBBABCABVBgsJBwgDAgQVCAoC AxYCAQIZAQIbAwIeARgYaGtwczovL2tleXMub3BlbnBncC5vcmcWIQQGJAsyyBlk cuwsSYsYdR58veSVQAUCYNQl+wUJA8LAmgAKCRAYdR58veSVQN3NB/sFTeXrZeDk ml/dshET8QbkOPgXlnibk8+Mauf+y9LjS9WT7R8EmqhK7T7aw115JQ1RWTM6kpQM jyDBjYF7piJEpNKI9YDeSnODKir1fWQqm9+wd68wAKGvV4m8kg9uOHCvXG4J++MG 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