Date: Fri, 23 Oct 2015 23:56:12 -0400 From: "Michael B. Eichorn" <ike@michaeleichorn.com> To: Erich Dollansky <erichsfreebsdlist@alogt.com>, "O. Hartmann" <ohartman@zedat.fu-berlin.de> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: replace uname -a informational string Message-ID: <1445658972.13154.44.camel@michaeleichorn.com> In-Reply-To: <20151024080936.0ff26783@X220.alogt.com> 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>
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--=-7JJGn9BKVa4rccJ2V/l5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2015-10-24 at 08:09 +0800, Erich Dollansky wrote: > Hi, >=20 > 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: > >=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 > why not replace uname at the source level then? >=20 > Erich That wouldn't hide the information in any substantial way. Uname is basically an abstraction of a subset of sysctls. As such, the information is integral to the kernel itself. Uname is just one of many tools that can be used to display this information. 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