#!/bin/sh
#
# Copyright (c) 2004  Tom Rhodes
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD: src/etc/rc.bsdextended,v 1.1 2004/09/29 00:12:28 trhodes Exp $
#

####
# Sample startup policy for the mac_bsdextended(4) security module.
#
# Suck in the system configuration variables.
####
if [ -z "${source_rc_confs_defined}" ]; then
        if [ -r /etc/defaults/rc.conf ]; then
                . /etc/defaults/rc.conf
                source_rc_confs
        elif [ -r /etc/rc.conf ]; then
                . /etc/rc.conf
        fi
fi

####
# Set ugidfw(8) to CMD:
####
CMD=/usr/sbin/ugidfw

####
# WARNING: recommended reading is the handbook's MAC
# chapter and the ugidfw(8)
# manual page.  You can lock yourself out of the system
# very quickly by setting incorrect values here.
####

####
# Set the value of 'x' to system users.  This would be nice but it
# does not get the \n proper.  Work around is used below.
#x=`awk -F: '($3 >= 1001) && ($3 != 65534) { print $1 }' /etc/passwd`;
#l=`awk -F: '($3 >= 1001) && ($3 != 65534) { print $3 }' /etc/passwd`;
####

####
# Build a generic list of rules here, these should be
# modified before using this script.
# ugidfw add 1 subject uid USER1 object uid USER2 mode n
# ugidfw add 2 subject gid USER1 object gid USER2 mode n
#
# For apache to read user files, the ruleadd must give
# it permissions by default.
####
${CMD} add subject uid 80 object not uid 80 mode rxws;
${CMD} add subject gid 80 object not gid 80 mode rxws;

####
# majordomo compat:
#${CMD} add subject uid 54 object not uid 54 mode rxws;
${CMD} add subject gid 26 object gid 54 mode rxws;

####
# This is for root:
${CMD} add subject uid 0 object not uid 0 mode arxws;
${CMD} add subject gid 0 object not gid 0 mode arxws;

####
# And for mailnull:
${CMD} add subject uid 26 object not uid 26 mode rxws;
${CMD} add subject gid 26 object not gid 26 mode rxws;

####
# And for majordomo:
${CMD} add subject uid 54 object not uid 54 mode rxws;
${CMD} add subject gid 54 object not gid 54 mode rxws;

####
# And for bin:
${CMD} add subject uid 3 object not uid 3 mode rxws;
${CMD} add subject gid 7 object not gid 7 mode rxws;

####
# And for mail/pop:
${CMD} add subject uid 68 object not uid 68 mode rxws;
${CMD} add subject gid 6 object not gid 6 mode arxws;

####
# And for smmsp:
${CMD} add subject uid 25 object not uid 25 mode rxws;
${CMD} add subject gid 25 object not gid 25 mode rxws;

####
# And for mailnull:
${CMD} add subject uid 26 object not uid 26 mode rxws;
${CMD} add subject gid 26 object not gid 26 mode rxws;

####
# For cyrus:
${CMD} add subject uid 60 object not uid 60 mode rxws;
${CMD} add subject gid 60 object not gid 60 mode rxws;

####
# For stunnel:
${CMD} add subject uid 1018 object not uid 1018 mode rxws;
${CMD} add subject gid 1018 object not gid 1018 mode rxws;

####
# For the nobody account:
${CMD} add subject uid 65534 object not uid 65534 mode rxws;
${CMD} add subject gid 65534 object not gid 65534 mode rxws;

####
# NOTICE: The next script adds a rule to allow
#	 access their mailbox which is owned by GID `6'.
#	 Removing this will give mailbox lock issues.
for x in `awk -F: '($3 >= 1001) && ($3 != 65534) { print $1 }' /etc/passwd`;
    do ${CMD} add subject uid $x object gid 6 mode arwxs;
done;

####
# Work around majordomo problem where gid is `4'.
for x in `awk -F: '($3 >= 1001) && ($3 != 65534) { print $1 }' /etc/passwd`;
    do ${CMD} add subject uid $x object gid 4 mode arwxs;
done;

####
# Use some script to get a list of users and
# add all users to mode n for all other users.  This
# will isolate all users from other user home directories while
# permitting them to use commands and browse the system.
for x in `awk -F: '($3 >= 1001) && ($3 != 65534) { print $1 }' /etc/passwd`;
    do ${CMD} add subject not uid $x object uid $x mode n;
done;

###
# Do the same thing but only for group ids in place of
# user IDs.
for x in `awk -F: '($3 >= 1001) && ($3 != 65534) { print $3 }' /etc/passwd`;
    do ${CMD} add subject not gid $x object uid $x mode n;
done;