From nobody Thu Dec 1 16:22:56 2022 X-Original-To: freebsd-current@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4NNLwH1Dffz4jc7W for ; Thu, 1 Dec 2022 16:23:11 +0000 (UTC) (envelope-from bsd-lists@bsdforge.com) Received: from udns.ultimatedns.net (udns.ultimatedns.net [24.113.41.81]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "ultimatedns.net", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4NNLwG14dRz4MVH; Thu, 1 Dec 2022 16:23:10 +0000 (UTC) (envelope-from bsd-lists@bsdforge.com) Authentication-Results: mx1.freebsd.org; dkim=none; spf=none (mx1.freebsd.org: domain of bsd-lists@bsdforge.com has no SPF policy when checking 24.113.41.81) smtp.mailfrom=bsd-lists@bsdforge.com Received: from ultimatedns.net (localhost [127.0.0.1]) by udns.ultimatedns.net (8.16.1/8.16.1) with ESMTP id 2B1GMuJY029101; Thu, 1 Dec 2022 08:23:02 -0800 (PST) (envelope-from bsd-lists@bsdforge.com) List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@freebsd.org MIME-Version: 1.0 Date: Thu, 01 Dec 2022 08:22:56 -0800 From: Chris To: Rick Macklem Cc: Peter Eriksson , FreeBSD CURRENT , "Bjoern A. Zeeb" , Alan Somers Subject: Re: RFC: nfsd in a vnet jail In-Reply-To: References: <82103A1E-9D39-47B0-9520-205583C8B680@lysator.liu.se> User-Agent: UDNSMS/17.0 Message-ID: <2980bcbd22f884962d358808f9440d77@bsdforge.com> X-Sender: bsd-lists@bsdforge.com Content-Type: multipart/mixed; boundary="=_cbaeb79b87ecbd078cfa5cb53adff3e9" X-Rspamd-Queue-Id: 4NNLwG14dRz4MVH X-Spamd-Bar: + X-Spamd-Result: default: False [1.50 / 15.00]; SUSPICIOUS_RECIPS(1.50)[]; MIME_GOOD(-0.10)[multipart/mixed,text/plain]; MIME_UNKNOWN(0.10)[application/pgp-keys]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; local_wl_ip(0.00)[24.113.41.81]; ASN(0.00)[asn:11404, ipnet:24.113.0.0/16, country:US]; FROM_EQ_ENVFROM(0.00)[]; FREEMAIL_TO(0.00)[gmail.com]; HAS_ATTACHMENT(0.00)[]; MLMMJ_DEST(0.00)[freebsd-current@freebsd.org]; FROM_HAS_DN(0.00)[]; TAGGED_RCPT(0.00)[]; R_SPF_NA(0.00)[no SPF record] X-Rspamd-Pre-Result: action=no action; module=multimap; Matched map: local_wl_ip X-ThisMailContainsUnwantedMimeParts: N --=_cbaeb79b87ecbd078cfa5cb53adff3e9 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; format=flowed On 2022-11-29 16:21, Rick Macklem wrote: > On Sun, Nov 27, 2022 at 10:04 AM Peter Eriksson wrote: > >> Keep the global variables as defaults that apply to all nfsds and allow >> (at least some subset) to be overridden inside the net jails if some things >> need to be changed from the defaults? >> >> This is pretty much a reply to one of the posts selected at random, > but I thought that better than starting a new email thread. > > bz@ and asomers@ have both asked about running mountd within a vnet prison > (one via offlist email and the other on phabricator). > > I think it is worth discussing here... > mountd (rightly or wrongly) does two distinctly different things: > 1 - It pushes the exports into the kernel via nmount() so they > can be hung off of the "struct mount" for a file system's > mount point. > --> This can only work for file system mount points and can > only be done once for any given file system mount point. > > At this time, I have it done once globally outside of the prisons. > The alternative I can see is doing it within each prison, but I > think that would require that each prison have its own file system(s). > (ie. The prison's root would always be a file system mount point.) > > 2 - It handles RPC Mount protocol requests from NFSv3 clients. This one > is NFSv3 specific, which is why I have done this NFSv4 only at > this time. To do this, it must be able to register with rpcbind, > and I have no idea if running rpcbind in a vnet jail is practical. > > Enforcing the use for separate file systems for each jail also makes > things safer, since the exports are enforced by the kernel. Without > this, a malicious NFSv4 client could "guess" a file handle for a file > outside the jail and gain access to that file. Put another way, without > a separate file system, there is no way to stop a malicious client from > finding files above the Root file handle. (Normal clients will use > PutRootFH and LookupParent and these won't be able to go above the top > of the jail.) > > So, what do others think of enforcing the requirement that each jail > have its own file systems for this? 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. --chris > > rick > > >> - Peter >> >> >> On Fri, Nov 25, 2022, 4:24 PM Rick Macklem wrote: >> >>> Hi, >>> >>> bz@ has encouraged me to fiddle with the nfsd >>> so that it works in a vnet jail. >>> I have now basically done so, specifically for >>> NFSv4, since NFSv3 presents various issues. >>> >>> What I have not yet done is put global variables >>> in the vnet. This needs to be done so that the nfsd >>> can be run in multiple jail instances and/or in and >>> outside of a jail. >>> The problem is that there are 100s of global variables. >>> >>> I can see two approaches: >>> 1 - Move them all into the vnet jail. This would imply >>> that all the sysctls need to somehow be changed, >>> which would seem to be a POLA violation. >>> It also implies a lot of stuff in the vnet. >>> 2 - Just move the global variables that will always >>> differ from one nfsd to another (this would make >>> the sysctls global and apply to all nfsds). >>> This will keep the number of globals in the vnet >>> smaller. >>> >>> I am currently leaning towards #2, put what do others >>> think? >>> >>> rick >>> ps: Personally, I don't know what use there is of >>> running the nfsd inside a vnet jail, but bz@ has >>> some use case. >>> >> >> --=_cbaeb79b87ecbd078cfa5cb53adff3e9 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 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