Date: Thu, 21 Aug 2003 00:39:00 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: ari <edelkind-freebsd-hackers@episec.com> Subject: Re: [future patch] dropping user privileges on demand Message-ID: <20030821073900.GA90003@rot13.obsecurity.org> In-Reply-To: <20030821065854.GA11586@dan.emsphone.com> References: <20030817181315.GL55671@episec.com> <20030821065854.GA11586@dan.emsphone.com>
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--W/nzBZO5zC0uMSeA Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Aug 21, 2003 at 01:58:54AM -0500, Dan Nelson wrote: > It does something similar, but uses a C-like language to control a > processes actions. This lets you get extremely fine-grained control > (allow httpd to bind to only port 80, once), but the rules run as > "root", so they can grant as well as revoke privileges. A useful > modification would be to allow users to submit their own policies that > can only disallow actions (i.e. all arguments and process variables are > read-only, and the script can either pass the syscall through or return > a failure code, nothing else). Exercise for the reader: find a situation where the failure to perform a syscall that normally succeeds, leads to privilege escalation :-) Kris --W/nzBZO5zC0uMSeA Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (FreeBSD) iD8DBQE/RHcUWry0BWjoQKURAuEzAJ9o49lyrY3Vol2F96FMTalpPeXXLgCdGXqb Dm3gcK2ZlBscCY1a9a+3jJE= =KWP8 -----END PGP SIGNATURE----- --W/nzBZO5zC0uMSeA--
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