> >The LSM paper cited (that does not require paying money) says very >little about what they do with regards to the filesystem. Do you have a >more informative URL? >
Here's a concrete example of an LSM directory jail implementation. Not all the features I think you're aiming for but it is source and is indicative of what is possible (er, has already been done) with LSM. David http://lwn.net/Articles/57713/ From: "Serge E. Hallyn" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] Subject: dirjail module Date: Mon, 10 Nov 2003 23:42:26 -0500 Attached are the header comments for a new LSM. I wrote it a few months ago to address a particular need in a large-scale installation for which DTE would have been inefficient. The module source can be found at http://www.cs.wm.edu/~hallyn/dirjail.c. I'll be curious to see if anyone else sees any use for this. -serge /* * File: dirjail.c * * Description: Intended as an efficient prison for suspect child processes. * * Assume a large set of users. Each has a directory under, say, * /home/sxx/username, where xx is a number from 00-03, and username * is the account name. Their files may be served and processed by * system processes and scripts (apache, accounting, etc). However, * they may also, under /home/sxx/username, place their own scripts. You * wish to confine the scripts to MOSTLY access only /home/sxx/username. * * modprobe dirjail * for count in 00 01 02 03; do * echo -n /home/s$count > /proc/jails * done * echo -n /bin > /proc/exec_exceptions * echo -n /lib > /proc/exec_exceptions * echo -n /tmp > /proc/rw_exceptions * echo -n /proc > /proc/read_exceptions * * Now a script started from under /home/s01/user3 will be confined to * only read, write, and execute files under /home/s01/user3. Exceptions * to this are: * it may execute anything under /bin * it may read and write under /tmp * it may read under /proc * * For the sake of simplicity, directory rx is always allowed. * However, directory write and file rwx are restricted. * * Any children of said process will be convined to the same jail. * * Copyright (C) 2001 Serge E. Hallyn <[EMAIL PROTECTED]> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */
