From owner-freebsd-questions@freebsd.org Fri Oct 23 23:18:06 2015 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 74BF5A1D900 for ; Fri, 23 Oct 2015 23:18:06 +0000 (UTC) (envelope-from ike@michaeleichorn.com) Received: from mx1.eichornenterprises.com (mx1.eichornenterprises.com [104.236.13.122]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mx1.eichornenterprises.com", Issuer "StartCom Class 1 Primary Intermediate Server CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 294791BE3 for ; Fri, 23 Oct 2015 23:18:05 +0000 (UTC) (envelope-from ike@michaeleichorn.com) Received: from mail.eichornenterprises.com (cpe-75-179-47-202.neo.res.rr.com [75.179.47.202]) by mx1.eichornenterprises.com (OpenSMTPD) with ESMTP id 60c632df; Fri, 23 Oct 2015 19:18:02 -0400 (EDT) Received: by mail.eichornenterprises.com (OpenSMTPD) with ESMTPSA id 8e7e4c63; TLS version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO; Fri, 23 Oct 2015 19:18:01 -0400 (EDT) Message-ID: <1445642440.13154.38.camel@michaeleichorn.com> Subject: Re: replace uname -a informational string From: "Michael B. Eichorn" To: Karl Young , "O. Hartmann" Cc: freebsd-questions Date: Fri, 23 Oct 2015 19:20:40 -0400 In-Reply-To: <20151023225524.GJ31202@mailboy.kipshouse.net> References: <20151023090805.5484ce9b@freyja.zeit4.iv.bundesimmobilien.de> <1445622325.1169.29.camel@michaeleichorn.com> <20151023225424.49220466.ohartman@zedat.fu-berlin.de> <20151023225524.GJ31202@mailboy.kipshouse.net> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-cHw2JaCBfLUBR/J3go8b" X-Mailer: Evolution 3.16.5 Mime-Version: 1.0 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Oct 2015 23:18:06 -0000 --=-cHw2JaCBfLUBR/J3go8b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2015-10-23 at 15:55 -0700, Karl Young wrote: >=20 > O. Hartmann(ohartman@zedat.fu-berlin.de)@2015.10.23 22:54:24 +0200: > > Am Fri, 23 Oct 2015 13:45:25 -0400 > > "Michael B. Eichorn" schrieb: > >=20 > >=20 > > First of all: Thank you very much for your concerns and answers. > >=20 > > > On Fri, 2015-10-23 at 09:08 +0200, O. Hartmann wrote: > > > > For security purposes, I need to replace the informations given > > > > by > > > > "uname -a" > > > > to hode the kernel build system, name et cetera. =20 > > >=20 > > > I presume you intendend 'hide' here? > > >=20 > > > If you want to scrub a binaries of _all_ information about the > > > building > > > system this is a problem Debian is actively working on called > > > 'reproducible builds' but is not possible today. > > >=20 > > > https://reproducible.debian.net > > >=20 > > > If you want to hide the hostname, why not just build with a > > > different > > > hostname set? > >=20 > > Because it is not only the hostname, uname reveals the target host, > > date and OS version. > >=20 > > In our case, the image ist built on a dedicated host for a security > > appliabce based on > > NanoBSD and I'd like to hide the OS type, the OS name, the build box' > > name and the build > > date.=20 >=20 > Perhaps you could mv or rm /usr/bin/uname and replace it with your own > script or binary that outputs whatever you want it to. >=20 > -karl To make that work you would need to do a lot of work to prevent the user from using a copy of the original uname (or something similar). The information is actually in the kernel itself, uname is just mechanism to report it. 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