From owner-freebsd-questions@freebsd.org Fri Oct 23 23:06:40 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 D8396A1D61A for ; Fri, 23 Oct 2015 23:06:40 +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 8502214D6 for ; Fri, 23 Oct 2015 23:06:40 +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 54129c5c; Fri, 23 Oct 2015 19:06:36 -0400 (EDT) Received: by mail.eichornenterprises.com (OpenSMTPD) with ESMTPSA id 788a8f2a; TLS version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO; Fri, 23 Oct 2015 19:06:35 -0400 (EDT) Message-ID: <1445641755.13154.27.camel@michaeleichorn.com> Subject: Re: replace uname -a informational string From: "Michael B. Eichorn" To: "O. Hartmann" Cc: freebsd-questions Date: Fri, 23 Oct 2015 19:09:15 -0400 In-Reply-To: <20151023225424.49220466.ohartman@zedat.fu-berlin.de> References: <20151023090805.5484ce9b@freyja.zeit4.iv.bundesimmobilien.de> <1445622325.1169.29.camel@michaeleichorn.com> <20151023225424.49220466.ohartman@zedat.fu-berlin.de> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-sjgSaHuQyMrfAUJIX9w+" 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 23:06:40 -0000 --=-sjgSaHuQyMrfAUJIX9w+ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2015-10-23 at 22:54 +0200, O. Hartmann wrote: > 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 I guess the next question is *who* are you hiding this from? There are probably a few ways to hide from a non-root user. Conversely hiding from root or a hardware attacker is probably impossible without modifing the source code. Also note that including the legally REQUIRED copyright licenses there will be a sufficient fingerprint to determine that the software is FreeBSD based. There may also be consequences for hiding/changing the output of uname. 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