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 4C4C644C86; Fri, 15 Mar 2024 15:47:28 +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=1710517649; cv=none; b=P3MQQSQHAJrfMiNV1wnLN1dB8Ejxa+yBpxUyg3hbM7jTxBVyC+RJt9hJP0qiKVlGJ8bpEi9gNsHZwQcCbO730e7xlOtbDPCNe43Lm2Qc0rWQCTtaSOD3bOR09AubvldRU6W9BYeVESYisxsOSL1RbQPElTyofE1BENxGJX9JF2Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710517649; c=relaxed/simple; bh=K1IkkVsToIrx0sJNiH5Tmo5mYxDsSzVdxWeszYu4/9o=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=HBhl/RB7E6SRbA8fhmoljdWCHSrDbqaUPoyxa65I6vXF0skKeyTDkjtao4O7VI25ZmuUgeMPQIbEgSX5J8G0sswrhArtGrINO8ZFT3PwfFk9G46EhgO+zdIP1gLRFuvBwuhZH0ISRUM7fXqYaTeuvm1jfscY3y5HHvGzN4NS5lw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=M1lKgc1i; 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="M1lKgc1i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 58231C433F1; Fri, 15 Mar 2024 15:47:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1710517648; bh=K1IkkVsToIrx0sJNiH5Tmo5mYxDsSzVdxWeszYu4/9o=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=M1lKgc1iwe257xvpSVbWIUkkmozZ3lm/E3aBxvGP9GcFq0i7kdJAM8F41DJg1FuCI wW2eOS/zNo6YICFMbNVqhQVYkHIjbq8ls3Gedw617MpjVLNsZjFMAKy7YF1ZX9pySf SIESmK7qEE9qzAyp+33rmCK/sUw2eNz9MNTORf/JW8e663KI3yKD6mLd6Yb5sEqKEt bmFNs+goKJ+tAASpWAnyme1drxNPeun4hzksE9Bi+oYaFPaPMPpSngz7dRDg9nsuIB xXBS0kQb2ZTJNh6kHi8Uaj2h+qx5XdlY/VUfKJniHnC1+IWLDLbHoirbMZtDhNQEVQ 3TCx9nF3u8pMg== Message-ID: Subject: Re: nfs client uses different MAC policy or model From: Jeff Layton To: "Daniel Walker (danielwa)" , "selinux@vger.kernel.org" Cc: "xe-linux-external(mailer list)" , "linux-nfs@vger.kernel.org" Date: Fri, 15 Mar 2024 11:47:27 -0400 In-Reply-To: References: Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, 2024-03-14 at 23:49 +0000, Daniel Walker (danielwa) wrote: > Hi, >=20 > It seems there is/was a problem using NFS security labels where the serve= r and client use > different MAC policy or model.=20 >=20 > I was reading this page, >=20 > http://www.selinuxproject.org/page/Labeled_NFS/TODO#Label_Translation_Fra= mework > > It seems like this problem was known in 2009 when this page was written. = Is > there a way to accomplish having extended attributes shared over NFS to a= client > with different selinux policies ? >=20 Currently Linux NFS client and server only support limited server mode, where the server presents the contexts as they are and the client enforces its own policy locally. There's no requirement that the server enforce the same policy (or even enforce a security policy at all), all it's doing is storing and presenting the security label. So what you're saying should "work" today. > Maybe it's possible to allow the client to write local file context witho= ut > writing that down to the remote filesystem. >=20 That could be done. Just prevent the client from sending updates to the security context to the server based on some switch. But...what do you do when you make a local change and then the inode gets cycled out of the cache? Once you bring it back in, it's going to revert to its old setting. That sort of thing sounds like it would be of limited utility. --=20 Jeff Layton