Date: Sat, 24 Oct 2015 11:36:26 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: "O. Hartmann" <ohartman@zedat.fu-berlin.de> Cc: <freebsd-questions@freebsd.org> 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>
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--Sig_/QpjOK9gyfYGHhLJpXa8hWS/ Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable "O. Hartmann" <ohartman@zedat.fu-berlin.de> wrote: > Am Fri, 23 Oct 2015 23:56:12 -0400 > "Michael B. Eichorn" <ike@michaeleichorn.com> 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" <ohartman@zedat.fu-berlin.de> wrote: > > > =20 > > > > Am Fri, 23 Oct 2015 13:45:25 -0400 > > > > "Michael B. Eichorn" <ike@michaeleichorn.com> 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/--
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