1#!/bin/sh
2#
3# Copyright (c) 2004  Tom Rhodes
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions
8# are met:
9# 1. Redistributions of source code must retain the above copyright
10#    notice, this list of conditions and the following disclaimer.
11# 2. Redistributions in binary form must reproduce the above copyright
12#    notice, this list of conditions and the following disclaimer in the
13#    documentation and/or other materials provided with the distribution.
14#
15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25# SUCH DAMAGE.
26#
27# $FreeBSD$
28#
29
30####
31# Sample startup policy for the mac_bsdextended(4) security module.
32#
33# Suck in the system configuration variables.
34####
35if [ -z "${source_rc_confs_defined}" ]; then
36        if [ -r /etc/defaults/rc.conf ]; then
37                . /etc/defaults/rc.conf
38                source_rc_confs
39        elif [ -r /etc/rc.conf ]; then
40                . /etc/rc.conf
41        fi
42fi
43
44####
45# Set ugidfw(8) to CMD:
46####
47CMD=/usr/sbin/ugidfw
48
49####
50# WARNING: recommended reading is the handbook's MAC
51# chapter and the ugidfw(8) manual page.  You can
52# lock yourself out of the system very quickly by setting
53# incorrect values here.  These are only examples.
54####
55
56####
57# Build a generic list of rules here, these should be
58# modified before using this script.
59#
60# For apache to read user files, the ruleadd must give
61# it permissions by default.
62####
63#${CMD} add subject uid 80 object not uid 80 mode rxws;
64#${CMD} add subject gid 80 object not gid 80 mode rxws;
65
66####
67# majordomo compat:
68#${CMD} add subject uid 54 object not uid 54 mode rxws;
69#${CMD} add subject gid 26 object gid 54 mode rxws;
70
71####
72# This is for root:
73${CMD} add subject uid 0 object not uid 0 mode arxws;
74${CMD} add subject gid 0 object not gid 0 mode arxws;
75
76####
77# And for majordomo:
78#${CMD} add subject uid 54 object not uid 54 mode rxws;
79#${CMD} add subject gid 54 object not gid 54 mode rxws;
80
81####
82# And for bin:
83${CMD} add subject uid 3 object not uid 3 mode rxws;
84${CMD} add subject gid 7 object not gid 7 mode rxws;
85
86####
87# And for mail/pop:
88#${CMD} add subject uid 68 object not uid 68 mode rxws;
89#${CMD} add subject gid 6 object not gid 6 mode arxws;
90
91####
92# And for smmsp:
93${CMD} add subject uid 25 object not uid 25 mode rxws;
94${CMD} add subject gid 25 object not gid 25 mode rxws;
95
96####
97# And for mailnull:
98${CMD} add subject uid 26 object not uid 26 mode rxws;
99${CMD} add subject gid 26 object not gid 26 mode rxws;
100
101####
102# For cyrus:
103#${CMD} add subject uid 60 object not uid 60 mode rxws;
104#${CMD} add subject gid 60 object not gid 60 mode rxws;
105
106####
107# For stunnel:
108#${CMD} add subject uid 1018 object not uid 1018 mode rxws;
109#${CMD} add subject gid 1018 object not gid 1018 mode rxws;
110
111####
112# For the nobody account:
113${CMD} add subject uid 65534 object not uid 65534 mode rxws;
114${CMD} add subject gid 65534 object not gid 65534 mode rxws;
115
116####
117# NOTICE: The next script adds a rule to allow
118#	 access their mailbox which is owned by GID `6'.
119#	 Removing this will give mailbox lock issues.
120for x in `awk -F: '($3 >= 1001) && ($3 != 65534) { print $1 }' /etc/passwd`;
121    do ${CMD} add subject uid $x object gid 6 mode arwxs;
122done;
123
124####
125# Use some script to get a list of users and
126# add all users to mode n for all other users.  This
127# will isolate all users from other user home directories while
128# permitting them to use commands and browse the system.
129for x in `awk -F: '($3 >= 1001) && ($3 != 65534) { print $1 }' /etc/passwd`;
130    do ${CMD} add subject not uid $x object uid $x mode n;
131done;
132
133###
134# Do the same thing but only for group ids in place of
135# user IDs.
136for x in `awk -F: '($3 >= 1001) && ($3 != 65534) { print $3 }' /etc/passwd`;
137    do ${CMD} add subject not gid $x object uid $x mode n;
138done;
139