From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 41FD34C92 for ; Mon, 19 May 2025 11:39:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747654781; cv=none; b=lig6PIDqPp3Aq75Bkm+Tydx+QgVFddzEPpgtDuqQdo9AyFUrq7oeDbHrqUSAUHlBxwVHsas5mf1B75pAOVShDmlzUn4GPo8i98/kaVwRegmQc1qY7A9SIBd2YPXf/ZVBCy8dyzD1B/gIB+Pze/yrG+GZ3i1PFtA9pxC+jpGdnm8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747654781; c=relaxed/simple; bh=UcCSuiV2P+uphfWQVx2heAHZ8cLA5LcWA5/XrD3v9Kw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=iwqOGg0SAlcn28GGMxWyniT28sBhD3S3j+9W2N/VhJacj0AtlIQoeYS+oRpL6BedRj5JqhVHIWkIzy2tqFWEaU+rYgBla2a9L8TTJYoxL844ZquwdE5rBNgrhLghfg8z8skOm7WcfMecBu4uIQ3ZUXFXoahsRxJxS/jJRyb2wic= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=D6RjmpI2; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="D6RjmpI2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5CD5AC4CEEB; Mon, 19 May 2025 11:39:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1747654780; bh=UcCSuiV2P+uphfWQVx2heAHZ8cLA5LcWA5/XrD3v9Kw=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=D6RjmpI24n/PeCHcvM3tFrCQMsAOlbXBOZdOCI5nqs9s55JzwF98IQagJ0Aj4w3J3 ATrrCWF5KKKc8CQ00VO6ws8/d6nozjVCPXpg7cB1v2laLWHK9tSYxMlDLSo+GOwNvY xOx6yi9mrODG5orE5W3RwAzpjdatppDwHmAF10uTsOQxfJhSs9N58hjLCnG4Bl52ar +F1zMC6Fu5gI4u0P5LpAFlp7jM7UTSdoradpBEpYUnbVPA6uuvI/KG0FIzsgmGDm9m S+k/e2UKLtHe14f2jXJGBuywGBRsWUEjn7tdavvNb6TFHVjR35If/vkLKL7+57Bgix VPEN9RWgjqiGQ== Message-ID: <232cc3d8f1d07be149f37b62204dd4505bd12d09.camel@kernel.org> Subject: Re: [PATCH nfs-utils] exportfs: make "insecure" the default for all exports From: Jeff Layton To: NeilBrown , Chuck Lever Cc: Steve Dickson , Tom Haynes , linux-nfs@vger.kernel.org Date: Mon, 19 May 2025 07:39:39 -0400 In-Reply-To: <174763456358.62796.11640858259978429069@noble.neil.brown.name> References: <>, <02da3d46-3b05-4167-8750-121f5e30b7e9@oracle.com> <174763456358.62796.11640858259978429069@noble.neil.brown.name> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV 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Mon, 2025-05-19 at 16:02 +1000, NeilBrown wrote: > On Fri, 16 May 2025, Chuck Lever wrote: > >=20 > > Fair enough. We'll focus on improving the man page text for now. > >=20 >=20 > Has anyone volunteered to do that? > > Here are some words that might be useful. I haven't tried to structure > them to fit well into the man page. Thanks Neil. I was planning to write up a manpage patch for this once the dust had settled from this discussion. I'll plan to incorporate something like what you've written below. > --------------- > sec=3Dsys (also known as AUTH_SYS) is only safe to specify for clients > that are connected to the server by a secure network - either physically > secure such as in a locked room, or cryptographically secure such as > with a VPN where the client hardware is also secure (locked cage or > secure-boot etc). >=20 > When such physical and/or crypto security is in place sec=3Dsys can > safely be used and there is an extra configuration option available in > a choice between the "secure" and "insecure" export options. =20 >=20 > "insecure" means that all software running in the client node is fully > trusted to only access files on the NFS exports that it is expected to > access. In this case the server will accept connections from any TCP > port on the client (and messages from any UDP port) - as they can > equally be trusted. >=20 > "secure" means that the clients are Unix-like systems and that only > "admin" software such as the kernel and administrative software running > as "root" can be trusted to access files appropriately. All other > software, which includes all user-space software running with a UID > other than zero, should be treated with caution and not given direct > access to the NFS server. In this case the server will reject > connections from TCP ports on the client with numbers not less than 1024 > (and UDP messages from ports not less than 1024) as such connections an > messages may be from an untrusted process. Note that on Unix-like > systems only privileged processes can send from ports below 1024. >=20 > The "secure" option is enabled by default as it is least likely to give > away undesired access. Note that the names of the options do not > clearly match the descriptions given. >=20 > ------------- >=20 > I haven't added anything about mtls as I couldn't find out how nfsd > interprets the identity presented in the client-side certificate. If > the identity is a "machine identity" then sec=3Dsys would make sense on > that connection. If the identity is for a specific user and can map to > a uid, the all_squash,anon=3DUID should be imposed on that connection. >=20 > Can you point me to any documentation about how the client certificate > is interpreted by nfsd? --=20 Jeff Layton