2 # Copyright (c) 1996 Poul-Henning Kamp
5 # Redistribution and use in source and binary forms, with or without
6 # modification, are permitted provided that the following conditions
8 # 1. Redistributions of source code must retain the above copyright
9 # notice, this list of conditions and the following disclaimer.
10 # 2. Redistributions in binary form must reproduce the above copyright
11 # notice, this list of conditions and the following disclaimer in the
12 # documentation and/or other materials provided with the distribution.
14 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 # ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 # $FreeBSD: src/etc/rc.firewall,v 1.30.2.16 2003/02/10 05:45:06 trhodes Exp $
27 # $DragonFly: src/etc/rc.firewall,v 1.2 2003/06/17 04:24:45 dillon Exp $
31 # Setup system for firewall service.
34 # Suck in the configuration variables.
35 if [ -z "${source_rc_confs_defined}" ]; then
36 if [ -r /etc/defaults/rc.conf ]; then
37 . /etc/defaults/rc.conf
39 elif [ -r /etc/rc.conf ]; then
45 # Define the firewall type in /etc/rc.conf. Valid values are:
46 # open - will allow anyone in
47 # client - will try to protect just this machine
48 # simple - will try to protect a whole network
49 # closed - totally disables IP services except via lo0 interface
50 # UNKNOWN - disables the loading of firewall rules.
51 # filename - will load the rules in the given filename (full path required)
53 # For ``client'' and ``simple'' the entries below should be customized
58 # If you don't know enough about packet filtering, we suggest that you
59 # take time to read this book:
61 # Building Internet Firewalls, 2nd Edition
62 # Brent Chapman and Elizabeth Zwicky
64 # O'Reilly & Associates, Inc
67 # http://www.oreilly.com/catalog/fire2/
69 # For a more advanced treatment of Internet Security read:
71 # Firewalls & Internet Security
72 # Repelling the wily hacker
73 # William R. Cheswick, Steven M. Bellowin
78 # http://www.awlonline.com/product/0%2C2627%2C0201633574%2C00.html
83 # Only in rare cases do you want to change these rules
85 ${fwcmd} add 100 pass all from any to any via lo0
86 ${fwcmd} add 200 deny all from any to 127.0.0.0/8
87 ${fwcmd} add 300 deny ip from 127.0.0.0/8 to any
90 if [ -n "${1}" ]; then
95 # Set quiet mode if requested
97 case ${firewall_quiet} in
107 # Flush out the list before we begin.
112 # Network Address Translation. All packets are passed to natd(8)
113 # before they encounter your remaining rules. The firewall rules
114 # will then be run again on each packet after translation by natd
115 # starting at the rule number following the divert rule.
117 # For ``simple'' firewall type the divert rule should be put to a
118 # different place to not interfere with address-checking rules.
120 case ${firewall_type} in
121 [Oo][Pp][Ee][Nn]|[Cc][Ll][Ii][Ee][Nn][Tt])
122 case ${natd_enable} in
124 if [ -n "${natd_interface}" ]; then
125 ${fwcmd} add 50 divert natd all from any to any via ${natd_interface}
132 # If you just configured ipfw in the kernel as a tool to solve network
133 # problems or you just want to disallow some particular kinds of traffic
134 # then you will want to change the default policy to open. You can also
135 # do this as your only action by setting the firewall_type to ``open''.
137 # ${fwcmd} add 65000 pass all from any to any
142 case ${firewall_type} in
145 ${fwcmd} add 65000 pass all from any to any
148 [Cc][Ll][Ii][Ee][Nn][Tt])
150 # This is a prototype setup that will protect your system somewhat
151 # against people from outside your own network.
154 # set these to your network and netmask and ip
161 # Allow any traffic to or from my own net.
162 ${fwcmd} add pass all from ${ip} to ${net}:${mask}
163 ${fwcmd} add pass all from ${net}:${mask} to ${ip}
165 # Allow TCP through if setup succeeded
166 ${fwcmd} add pass tcp from any to any established
168 # Allow IP fragments to pass through
169 ${fwcmd} add pass all from any to any frag
171 # Allow setup of incoming email
172 ${fwcmd} add pass tcp from any to ${ip} 25 setup
174 # Allow setup of outgoing TCP connections only
175 ${fwcmd} add pass tcp from ${ip} to any setup
177 # Disallow setup of all other TCP connections
178 ${fwcmd} add deny tcp from any to any setup
180 # Allow DNS queries out in the world
181 ${fwcmd} add pass udp from ${ip} to any 53 keep-state
183 # Allow NTP queries out in the world
184 ${fwcmd} add pass udp from ${ip} to any 123 keep-state
186 # Everything else is denied by default, unless the
187 # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
191 [Ss][Ii][Mm][Pp][Ll][Ee])
193 # This is a prototype setup for a simple firewall. Configure this
194 # machine as a named server and ntp server, and point all the machines
195 # on the inside at this machine for those services.
198 # set these to your outside interface network and netmask and ip
201 omask="255.255.255.240"
204 # set these to your inside interface network and netmask and ip
207 imask="255.255.255.240"
213 ${fwcmd} add deny all from ${inet}:${imask} to any in via ${oif}
214 ${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif}
216 # Stop RFC1918 nets on the outside interface
217 ${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif}
218 ${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif}
219 ${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif}
221 # Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
222 # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
223 # on the outside interface
224 ${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif}
225 ${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif}
226 ${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif}
227 ${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif}
228 ${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif}
230 # Network Address Translation. This rule is placed here deliberately
231 # so that it does not interfere with the surrounding address-checking
232 # rules. If for example one of your internal LAN machines had its IP
233 # address set to 192.0.2.1 then an incoming packet for it after being
234 # translated by natd(8) would match the `deny' rule above. Similarly
235 # an outgoing packet originated from it before being translated would
236 # match the `deny' rule below.
237 case ${natd_enable} in
239 if [ -n "${natd_interface}" ]; then
240 ${fwcmd} add divert natd all from any to any via ${natd_interface}
245 # Stop RFC1918 nets on the outside interface
246 ${fwcmd} add deny all from 10.0.0.0/8 to any via ${oif}
247 ${fwcmd} add deny all from 172.16.0.0/12 to any via ${oif}
248 ${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif}
250 # Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
251 # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
252 # on the outside interface
253 ${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif}
254 ${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif}
255 ${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif}
256 ${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif}
257 ${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif}
259 # Allow TCP through if setup succeeded
260 ${fwcmd} add pass tcp from any to any established
262 # Allow IP fragments to pass through
263 ${fwcmd} add pass all from any to any frag
265 # Allow setup of incoming email
266 ${fwcmd} add pass tcp from any to ${oip} 25 setup
268 # Allow access to our DNS
269 ${fwcmd} add pass tcp from any to ${oip} 53 setup
270 ${fwcmd} add pass udp from any to ${oip} 53
271 ${fwcmd} add pass udp from ${oip} 53 to any
273 # Allow access to our WWW
274 ${fwcmd} add pass tcp from any to ${oip} 80 setup
276 # Reject&Log all setup of incoming connections from the outside
277 ${fwcmd} add deny log tcp from any to any in via ${oif} setup
279 # Allow setup of any other TCP connection
280 ${fwcmd} add pass tcp from any to any setup
282 # Allow DNS queries out in the world
283 ${fwcmd} add pass udp from ${oip} to any 53 keep-state
285 # Allow NTP queries out in the world
286 ${fwcmd} add pass udp from ${oip} to any 123 keep-state
288 # Everything else is denied by default, unless the
289 # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
293 [Cc][Ll][Oo][Ss][Ee][Dd])
296 [Uu][Nn][Kk][Nn][Oo][Ww][Nn])
299 if [ -r "${firewall_type}" ]; then
300 ${fwcmd} ${firewall_flags} ${firewall_type}