From owner-freebsd-questions@freebsd.org Sat Oct 24 09:36:37 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 12705A1CD14 for ; Sat, 24 Oct 2015 09:36:37 +0000 (UTC) (envelope-from freebsd-listen@fabiankeil.de) Received: from smtprelay04.ispgateway.de (smtprelay04.ispgateway.de [80.67.31.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C659B18B4 for ; Sat, 24 Oct 2015 09:36:36 +0000 (UTC) (envelope-from freebsd-listen@fabiankeil.de) Received: from [78.35.160.138] (helo=fabiankeil.de) by smtprelay04.ispgateway.de with esmtpsa (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.84) (envelope-from ) id 1ZpvFS-0001Qb-Uv; Sat, 24 Oct 2015 11:36:27 +0200 Date: Sat, 24 Oct 2015 11:36:26 +0200 From: Fabian Keil To: "O. Hartmann" Cc: Subject: Re: replace uname -a informational string Message-ID: <1b1ca543.75a62142@fabiankeil.de> In-Reply-To: <20151024095839.2da2cb97.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> <20151024080936.0ff26783@X220.alogt.com> <1445658972.13154.44.camel@michaeleichorn.com> <20151024095839.2da2cb97.ohartman@zedat.fu-berlin.de> Reply-To: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; boundary="Sig_/QpjOK9gyfYGHhLJpXa8hWS/"; protocol="application/pgp-signature" X-Df-Sender: Nzc1MDY3 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: Sat, 24 Oct 2015 09:36:37 -0000 --Sig_/QpjOK9gyfYGHhLJpXa8hWS/ Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable "O. Hartmann" wrote: > Am Fri, 23 Oct 2015 23:56:12 -0400 > "Michael B. Eichorn" schrieb: >=20 > > On Sat, 2015-10-24 at 08:09 +0800, Erich Dollansky wrote: [...] > > > On Fri, 23 Oct 2015 22:54:24 +0200 > > > "O. Hartmann" wrote: > > > =20 > > > > Am Fri, 23 Oct 2015 13:45:25 -0400 > > > > "Michael B. Eichorn" schrieb: [...] > > > > > On Fri, 2015-10-23 at 09:08 +0200, O. Hartmann wrote: =20 > > > > > > 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 > > > >=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 > > > why not replace uname at the source level then? [...] > > That wouldn't hide the information in any substantial way. Uname is > > basically an abstraction of a subset of sysctls. As such, the informati= on > > is integral to the kernel itself. Uname is just one of many tools that > > can be used to display this information. > >=20 > > Fundamentally the kernel itself needs to be changed not uname. >=20 > I'm well aware of that fact. At many places, the build-process sets varia= bles from the > outside world while building binaries and kernel and since I build everyt= hing from > scratch, I intend to manipulate those variables - if possible. It's possible and already done on FreeBSD consumers like ElectroBSD as one of the steps to get reproducible builds. The variables are set by sys/conf/newvers.sh and most of them can already be overwritten through the environment. Fabian --Sig_/QpjOK9gyfYGHhLJpXa8hWS/ Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlYrURcACgkQBYqIVf93VJ0aiACaAphPNC7/taDOL+O/SL97GeCM yF4AnA7jQcNsLC4mQ19fDZEWOUtipinz =fSx8 -----END PGP SIGNATURE----- --Sig_/QpjOK9gyfYGHhLJpXa8hWS/--