From owner-freebsd-hackers Wed Nov 27 05:07:52 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id FAA18692 for hackers-outgoing; Wed, 27 Nov 1996 05:07:52 -0800 (PST) Received: from zwei.siemens.at (zwei.siemens.at [193.81.246.12]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id FAA18683 for ; Wed, 27 Nov 1996 05:07:40 -0800 (PST) Received: from sol1.gud.siemens.co.at (root@[10.1.143.100]) by zwei.siemens.at (8.7.5/8.7.3) with SMTP id OAA25565 for ; Wed, 27 Nov 1996 14:06:45 +0100 (MET) Received: from ws2301.gud.siemens.co.at by sol1.gud.siemens.co.at with smtp (Smail3.1.28.1 #7 for ) id m0vSjhX-00023JC; Wed, 27 Nov 96 14:06 MET Received: by ws2301.gud.siemens.co.at (1.37.109.16/1.37) id AA071569903; Wed, 27 Nov 1996 14:05:03 +0100 From: "Hr.Ladavac" Message-Id: <199611271305.AA071569903@ws2301.gud.siemens.co.at> Subject: Re: looking for an idea To: julian@whistle.com (Julian Elischer) Date: Wed, 27 Nov 1996 14:05:03 +0100 (MEZ) Cc: wpaul@skynet.ctr.columbia.edu, terry@lambert.org, sprice@hiwaay.net, hackers@freebsd.org In-Reply-To: <329B547F.167EB0E7@whistle.com> from "Julian Elischer" at Nov 26, 96 12:35:11 pm X-Mailer: ELM [version 2.4 PL24 ME8a] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk E-mail message from Julian Elischer contained: > Bill Paul wrote: > > > > > If YOU ( the server) are root.... > > make a file owned by them mode 400 > require them to open it and send you the file descriptor via AF_UNIX > > check it matches.. > if it does, then > 1/ the are themselves > or > 2/ they are root (game over) Or 3) they made a hard link, opened that, and sent you the file descriptor. The only protection agains that is a partition writable only by root where these files are to live--almost as bad as procfs. /Marino