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#
28
29####
30# Sample startup policy for the mac_bsdextended(4) security module.
31#
32# Suck in the system configuration variables.
33####
34if [ -z "${source_rc_confs_defined}" ]; then
35        if [ -r /etc/defaults/rc.conf ]; then
36                . /etc/defaults/rc.conf
37                source_rc_confs
38        elif [ -r /etc/rc.conf ]; then
39                . /etc/rc.conf
40        fi
41fi
42
43####
44# Set ugidfw(8) to CMD:
45####
46CMD=/usr/sbin/ugidfw
47
48####
49# WARNING: recommended reading is the handbook's MAC
50# chapter and the ugidfw(8) manual page.  You can
51# lock yourself out of the system very quickly by setting
52# incorrect values here.  These are only examples.
53####
54
55####
56# Build a generic list of rules here, these should be
57# modified before using this script.
58#
59# For apache to read user files, the ruleadd must give
60# it permissions by default.
61####
62#${CMD} add subject uid 80 object not uid 80 mode rxws;
63#${CMD} add subject gid 80 object not gid 80 mode rxws;
64
65####
66# majordomo compat:
67#${CMD} add subject uid 54 object not uid 54 mode rxws;
68#${CMD} add subject gid 26 object gid 54 mode rxws;
69
70####
71# This is for root:
72${CMD} add subject uid 0 object not uid 0 mode arxws;
73${CMD} add subject gid 0 object not gid 0 mode arxws;
74
75####
76# And for majordomo:
77#${CMD} add subject uid 54 object not uid 54 mode rxws;
78#${CMD} add subject gid 54 object not gid 54 mode rxws;
79
80####
81# And for bin:
82${CMD} add subject uid 3 object not uid 3 mode rxws;
83${CMD} add subject gid 7 object not gid 7 mode rxws;
84
85####
86# And for mail/pop:
87#${CMD} add subject uid 68 object not uid 68 mode rxws;
88#${CMD} add subject gid 6 object not gid 6 mode arxws;
89
90####
91# And for smmsp:
92${CMD} add subject uid 25 object not uid 25 mode rxws;
93${CMD} add subject gid 25 object not gid 25 mode rxws;
94
95####
96# And for mailnull:
97${CMD} add subject uid 26 object not uid 26 mode rxws;
98${CMD} add subject gid 26 object not gid 26 mode rxws;
99
100####
101# For cyrus:
102#${CMD} add subject uid 60 object not uid 60 mode rxws;
103#${CMD} add subject gid 60 object not gid 60 mode rxws;
104
105####
106# For stunnel:
107#${CMD} add subject uid 1018 object not uid 1018 mode rxws;
108#${CMD} add subject gid 1018 object not gid 1018 mode rxws;
109
110####
111# For the nobody account:
112${CMD} add subject uid 65534 object not uid 65534 mode rxws;
113${CMD} add subject gid 65534 object not gid 65534 mode rxws;
114
115####
116# NOTICE: The next script adds a rule to allow
117#	 access their mailbox which is owned by GID `6'.
118#	 Removing this will give mailbox lock issues.
119for x in `awk -F: '($3 >= 1001) && ($3 != 65534) { print $1 }' /etc/passwd`;
120    do ${CMD} add subject uid $x object gid 6 mode arwxs;
121done;
122
123####
124# Use some script to get a list of users and
125# add all users to mode n for all other users.  This
126# will isolate all users from other user home directories while
127# permitting them to use commands and browse the system.
128for x in `awk -F: '($3 >= 1001) && ($3 != 65534) { print $1 }' /etc/passwd`;
129    do ${CMD} add subject not uid $x object uid $x mode n;
130done;
131
132###
133# Do the same thing but only for group ids in place of
134# user IDs.
135for x in `awk -F: '($3 >= 1001) && ($3 != 65534) { print $3 }' /etc/passwd`;
136    do ${CMD} add subject not gid $x object uid $x mode n;
137done;
138