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rc.firewall (25478) rc.firewall (29300)
1############
2# Setup system for firewall service.
1############
2# Setup system for firewall service.
3# $Id: rc.firewall,v 1.11 1997/05/03 11:22:17 jkh Exp $
3# $Id: rc.firewall,v 1.12 1997/05/05 07:08:31 jkh Exp $
4
5############
4
5############
6# Define the firewall type in /etc/rc.conf. Valid values are:
7# open - will allow anyone in
8# client - will try to protect just this machine
9# simple - will try to protect a whole network
10# closed - totally disables IP services except via lo0 interface
11# UNKNOWN - disables the loading of firewall rules.
12# filename - will load the rules in the given filename (full path required)
6#
13#
7# >>Warning<<
8# This file is not very old yet, and have been put together without much
9# testing of the contents.
14# For ``client'' and ``simple'' the entries below should be customized
15# appropriately.
10
16
11# Set this to be the type of firewall you want: open, client, simple or NONE.
12# ``open'' will allow anyone in, ``client'' will try to protect just one
13# machine and ``simple'' will try to protect a whole network (entries should
14# be customized appropriately below). To let no one in, use NONE.
15
16############
17#
18# If you don't know enough about packet filtering, we suggest that you
19# take time to read this book:
20#
21# Building Internet Firewalls
22# Brent Chapman and Elizabeth Zwicky
23#

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31# Repelling the wily hacker
32# William R. Cheswick, Steven M. Bellowin
33#
34# Addison-Wesley
35# ISBN 0-201-6337-4
36# http://www.awl.com/
37#
38
17############
18#
19# If you don't know enough about packet filtering, we suggest that you
20# take time to read this book:
21#
22# Building Internet Firewalls
23# Brent Chapman and Elizabeth Zwicky
24#

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32# Repelling the wily hacker
33# William R. Cheswick, Steven M. Bellowin
34#
35# Addison-Wesley
36# ISBN 0-201-6337-4
37# http://www.awl.com/
38#
39
40if [ "x$1" != "x" ]; then
41 firewall_type=$1
42fi
43
39############
44############
45# Set quiet mode if requested
46if [ "x$firewall_quiet" = "xYES" ]; then
47 fwcmd="/sbin/ipfw -q"
48else
49 fwcmd="/sbin/ipfw"
50fi
51
52############
40# Flush out the list before we begin.
53# Flush out the list before we begin.
41/sbin/ipfw -f flush
54$fwcmd -f flush
42
43############
44# If you just configured ipfw in the kernel as a tool to solve network
45# problems or you just want to disallow some particular kinds of traffic
46# they you will want to change the default policy to open. You can also
47# do this as your only action by setting the firewall_type to ``open''.
48
55
56############
57# If you just configured ipfw in the kernel as a tool to solve network
58# problems or you just want to disallow some particular kinds of traffic
59# they you will want to change the default policy to open. You can also
60# do this as your only action by setting the firewall_type to ``open''.
61
49# /sbin/ipfw add 65000 pass all from any to any
62# $fwcmd add 65000 pass all from any to any
50
51############
52# Only in rare cases do you want to change this rule
63
64############
65# Only in rare cases do you want to change this rule
53/sbin/ipfw add 1000 pass all from 127.0.0.1 to 127.0.0.1
66$fwcmd add 1000 pass all from 127.0.0.1 to 127.0.0.1
54
55
56# Prototype setups.
67
68
69# Prototype setups.
57if [ "${firewall}" = "open" ]; then
70if [ "${firewall_type}" = "open" ]; then
58
71
59 /sbin/ipfw add 65000 pass all from any to any
72 $fwcmd add 65000 pass all from any to any
60
73
61elif [ "${firewall}" = "client" ]; then
74elif [ "${firewall_type}" = "simple" ]; then
62
75
76 $fwcmd add 65000 pass all from any to any via lo0
77
78elif [ "${firewall_type}" = "client" ]; then
79
63 ############
64 # This is a prototype setup that will protect your system somewhat against
65 # people from outside your own network.
66 ############
67
68 # set these to your network and netmask and ip
69 net="192.168.4.0"
70 mask="255.255.255.0"
71 ip="192.168.4.17"
72
73 # Allow any traffic to or from my own net.
80 ############
81 # This is a prototype setup that will protect your system somewhat against
82 # people from outside your own network.
83 ############
84
85 # set these to your network and netmask and ip
86 net="192.168.4.0"
87 mask="255.255.255.0"
88 ip="192.168.4.17"
89
90 # Allow any traffic to or from my own net.
74 /sbin/ipfw add pass all from ${ip} to ${net}:${mask}
75 /sbin/ipfw add pass all from ${net}:${mask} to ${ip}
91 $fwcmd add pass all from ${ip} to ${net}:${mask}
92 $fwcmd add pass all from ${net}:${mask} to ${ip}
76
77 # Allow TCP through if setup succeeded
93
94 # Allow TCP through if setup succeeded
78 /sbin/ipfw add pass tcp from any to any established
95 $fwcmd add pass tcp from any to any established
79
80 # Allow setup of incoming email
96
97 # Allow setup of incoming email
81 /sbin/ipfw add pass tcp from any to ${ip} 25 setup
98 $fwcmd add pass tcp from any to ${ip} 25 setup
82
83 # Allow setup of outgoing TCP connections only
99
100 # Allow setup of outgoing TCP connections only
84 /sbin/ipfw add pass tcp from ${ip} to any setup
101 $fwcmd add pass tcp from ${ip} to any setup
85
86 # Disallow setup of all other TCP connections
102
103 # Disallow setup of all other TCP connections
87 /sbin/ipfw add deny tcp from any to any setup
104 $fwcmd add deny tcp from any to any setup
88
89 # Allow DNS queries out in the world
105
106 # Allow DNS queries out in the world
90 /sbin/ipfw add pass udp from any 53 to ${ip}
91 /sbin/ipfw add pass udp from ${ip} to any 53
107 $fwcmd add pass udp from any 53 to ${ip}
108 $fwcmd add pass udp from ${ip} to any 53
92
93 # Allow NTP queries out in the world
109
110 # Allow NTP queries out in the world
94 /sbin/ipfw add pass udp from any 123 to ${ip}
95 /sbin/ipfw add pass udp from ${ip} to any 123
111 $fwcmd add pass udp from any 123 to ${ip}
112 $fwcmd add pass udp from ${ip} to any 123
96
97 # Everything else is denied as default.
98
113
114 # Everything else is denied as default.
115
99elif [ "${firewall}" = "simple" ]; then
116elif [ "${firewall_type}" = "simple" ]; then
100
101 ############
102 # This is a prototype setup for a simple firewall. Configure this machine
103 # as a named server and ntp server, and point all the machines on the inside
104 # at this machine for those services.
105 ############
106
107 # set these to your outside interface network and netmask and ip

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112
113 # set these to your inside interface network and netmask and ip
114 iif="ed1"
115 inet="192.168.3.0"
116 imask="255.255.255.0"
117 iip="192.168.3.17"
118
119 # Stop spoofing
117
118 ############
119 # This is a prototype setup for a simple firewall. Configure this machine
120 # as a named server and ntp server, and point all the machines on the inside
121 # at this machine for those services.
122 ############
123
124 # set these to your outside interface network and netmask and ip

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129
130 # set these to your inside interface network and netmask and ip
131 iif="ed1"
132 inet="192.168.3.0"
133 imask="255.255.255.0"
134 iip="192.168.3.17"
135
136 # Stop spoofing
120 /sbin/ipfw add deny all from ${inet}:${imask} to any in via ${oif}
121 /sbin/ipfw add deny all from ${onet}:${omask} to any in via ${iif}
137 $fwcmd add deny all from ${inet}:${imask} to any in via ${oif}
138 $fwcmd add deny all from ${onet}:${omask} to any in via ${iif}
122
123 # Stop RFC1918 nets on the outside interface
139
140 # Stop RFC1918 nets on the outside interface
124 /sbin/ipfw add deny all from 192.168.0.0:255.255.0.0 to any via ${oif}
125 /sbin/ipfw add deny all from 172.16.0.0:255.240.0.0 to any via ${oif}
126 /sbin/ipfw add deny all from 10.0.0.0:255.0.0.0 to any via ${oif}
141 $fwcmd add deny all from 192.168.0.0:255.255.0.0 to any via ${oif}
142 $fwcmd add deny all from 172.16.0.0:255.240.0.0 to any via ${oif}
143 $fwcmd add deny all from 10.0.0.0:255.0.0.0 to any via ${oif}
127
128 # Allow TCP through if setup succeeded
144
145 # Allow TCP through if setup succeeded
129 /sbin/ipfw add pass tcp from any to any established
146 $fwcmd add pass tcp from any to any established
130
131 # Allow setup of incoming email
147
148 # Allow setup of incoming email
132 /sbin/ipfw add pass tcp from any to ${oip} 25 setup
149 $fwcmd add pass tcp from any to ${oip} 25 setup
133
134 # Allow access to our DNS
150
151 # Allow access to our DNS
135 /sbin/ipfw add pass tcp from any to ${oip} 53 setup
152 $fwcmd add pass tcp from any to ${oip} 53 setup
136
137 # Allow access to our WWW
153
154 # Allow access to our WWW
138 /sbin/ipfw add pass tcp from any to ${oip} 80 setup
155 $fwcmd add pass tcp from any to ${oip} 80 setup
139
140 # Reject&Log all setup of incoming connections from the outside
156
157 # Reject&Log all setup of incoming connections from the outside
141 /sbin/ipfw add deny log tcp from any to any in via ${oif} setup
158 $fwcmd add deny log tcp from any to any in via ${oif} setup
142
143 # Allow setup of any other TCP connection
159
160 # Allow setup of any other TCP connection
144 /sbin/ipfw add pass tcp from any to any setup
161 $fwcmd add pass tcp from any to any setup
145
146 # Allow DNS queries out in the world
162
163 # Allow DNS queries out in the world
147 /sbin/ipfw add pass udp from any 53 to ${oip}
148 /sbin/ipfw add pass udp from ${oip} to any 53
164 $fwcmd add pass udp from any 53 to ${oip}
165 $fwcmd add pass udp from ${oip} to any 53
149
150 # Allow NTP queries out in the world
166
167 # Allow NTP queries out in the world
151 /sbin/ipfw add pass udp from any 123 to ${oip}
152 /sbin/ipfw add pass udp from ${oip} to any 123
168 $fwcmd add pass udp from any 123 to ${oip}
169 $fwcmd add pass udp from ${oip} to any 123
153
154 # Everything else is denied as default.
155
170
171 # Everything else is denied as default.
172
156elif [ "${firewall}" != "NONE" -a -r "${firewall}" ]; then
157
158 /sbin/ipfw ${firewall}
173elif [ "${firewall_type}" != "NONE" -a -r "${firewall_type}" ]; then
174 $fwcmd ${firewall}
159fi
175fi