rc.firewall revision 56736
1############ 2# Setup system for firewall service. 3# $FreeBSD: head/etc/rc.firewall 56736 2000-01-28 11:30:28Z rgrimes $ 4 5# Suck in the configuration variables. 6if [ -r /etc/defaults/rc.conf ]; then 7 . /etc/defaults/rc.conf 8elif [ -r /etc/rc.conf ]; then 9 . /etc/rc.conf 10fi 11 12############ 13# Define the firewall type in /etc/rc.conf. Valid values are: 14# open - will allow anyone in 15# client - will try to protect just this machine 16# simple - will try to protect a whole network 17# closed - totally disables IP services except via lo0 interface 18# UNKNOWN - disables the loading of firewall rules. 19# filename - will load the rules in the given filename (full path required) 20# 21# For ``client'' and ``simple'' the entries below should be customized 22# appropriately. 23 24############ 25# 26# If you don't know enough about packet filtering, we suggest that you 27# take time to read this book: 28# 29# Building Internet Firewalls 30# Brent Chapman and Elizabeth Zwicky 31# 32# O'Reilly & Associates, Inc 33# ISBN 1-56592-124-0 34# http://www.ora.com/ 35# 36# For a more advanced treatment of Internet Security read: 37# 38# Firewalls & Internet Security 39# Repelling the wily hacker 40# William R. Cheswick, Steven M. Bellowin 41# 42# Addison-Wesley 43# ISBN 0-201-6337-4 44# http://www.awl.com/ 45# 46 47if [ -n "${1}" ]; then 48 firewall_type="${1}" 49fi 50 51############ 52# Set quiet mode if requested 53# 54case ${firewall_quiet} in 55[Yy][Ee][Ss]) 56 fwcmd="/sbin/ipfw -q" 57 ;; 58*) 59 fwcmd="/sbin/ipfw" 60 ;; 61esac 62 63############ 64# Flush out the list before we begin. 65# 66${fwcmd} -f flush 67 68############ 69# These rules are required for using natd. All packets are passed to 70# natd before they encounter your remaining rules. The firewall rules 71# will then be run again on each packet after translation by natd, 72# minus any divert rules (see natd(8)). 73# 74case ${natd_enable} in 75[Yy][Ee][Ss]) 76 if [ -n "${natd_interface}" ]; then 77 ${fwcmd} add divert natd all from any to any via ${natd_interface} 78 fi 79 ;; 80esac 81 82############ 83# If you just configured ipfw in the kernel as a tool to solve network 84# problems or you just want to disallow some particular kinds of traffic 85# then you will want to change the default policy to open. You can also 86# do this as your only action by setting the firewall_type to ``open''. 87# 88# ${fwcmd} add 65000 pass all from any to any 89 90############ 91# Only in rare cases do you want to change these rules 92# 93${fwcmd} add 100 pass all from any to any via lo0 94${fwcmd} add 200 deny all from any to 127.0.0.0/8 95# If you're using 'options BRIDGE', uncomment the following line to pass ARP 96#${fwcmd} add 300 pass udp from 0.0.0.0 2054 to 0.0.0.0 97 98 99# Prototype setups. 100# 101case ${firewall_type} in 102[Oo][Pp][Ee][Nn]) 103 ${fwcmd} add 65000 pass all from any to any 104 ;; 105 106[Cc][Ll][Ii][Ee][Nn][Tt]) 107 ############ 108 # This is a prototype setup that will protect your system somewhat 109 # against people from outside your own network. 110 ############ 111 112 # set these to your network and netmask and ip 113 net="192.0.2.0" 114 mask="255.255.255.0" 115 ip="192.0.2.1" 116 117 # Allow any traffic to or from my own net. 118 ${fwcmd} add pass all from ${ip} to ${net}:${mask} 119 ${fwcmd} add pass all from ${net}:${mask} to ${ip} 120 121 # Allow TCP through if setup succeeded 122 ${fwcmd} add pass tcp from any to any established 123 124 # Allow IP fragments to pass through 125 ${fwcmd} add pass all from any to any frag 126 127 # Allow setup of incoming email 128 ${fwcmd} add pass tcp from any to ${ip} 25 setup 129 130 # Allow setup of outgoing TCP connections only 131 ${fwcmd} add pass tcp from ${ip} to any setup 132 133 # Disallow setup of all other TCP connections 134 ${fwcmd} add deny tcp from any to any setup 135 136 # Allow DNS queries out in the world 137 ${fwcmd} add pass udp from any 53 to ${ip} 138 ${fwcmd} add pass udp from ${ip} to any 53 139 140 # Allow NTP queries out in the world 141 ${fwcmd} add pass udp from any 123 to ${ip} 142 ${fwcmd} add pass udp from ${ip} to any 123 143 144 # Everything else is denied by default, unless the 145 # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel 146 # config file. 147 ;; 148 149[Ss][Ii][Mm][Pp][Ll][Ee]) 150 ############ 151 # This is a prototype setup for a simple firewall. Configure this 152 # machine as a named server and ntp server, and point all the machines 153 # on the inside at this machine for those services. 154 ############ 155 156 # set these to your outside interface network and netmask and ip 157 oif="ed0" 158 onet="192.0.2.0" 159 omask="255.255.255.240" 160 oip="192.0.2.1" 161 162 # set these to your inside interface network and netmask and ip 163 iif="ed1" 164 inet="192.0.2.16" 165 imask="255.255.255.240" 166 iip="192.0.2.17" 167 168 # Stop spoofing 169 ${fwcmd} add deny all from ${inet}:${imask} to any in via ${oif} 170 ${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif} 171 172 # Stop RFC1918 nets on the outside interface 173 ${fwcmd} add deny all from 10.0.0.0/8 to any via ${oif} 174 ${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif} 175 ${fwcmd} add deny all from 172.16.0.0/12 to any via ${oif} 176 ${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif} 177 ${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif} 178 ${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif} 179 180 # Stop draft-manning-dsua-01.txt nets on the outside interface 181 ${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif} 182 ${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif} 183 ${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif} 184 ${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif} 185 ${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif} 186 ${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif} 187 ${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif} 188 ${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif} 189 ${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif} 190 ${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif} 191 192 # Allow TCP through if setup succeeded 193 ${fwcmd} add pass tcp from any to any established 194 195 # Allow IP fragments to pass through 196 ${fwcmd} add pass all from any to any frag 197 198 # Allow setup of incoming email 199 ${fwcmd} add pass tcp from any to ${oip} 25 setup 200 201 # Allow access to our DNS 202 ${fwcmd} add pass tcp from any to ${oip} 53 setup 203 ${fwcmd} add pass udp from any to ${oip} 53 204 ${fwcmd} add pass udp from ${oip} 53 to any 205 206 # Allow access to our WWW 207 ${fwcmd} add pass tcp from any to ${oip} 80 setup 208 209 # Reject&Log all setup of incoming connections from the outside 210 ${fwcmd} add deny log tcp from any to any in via ${oif} setup 211 212 # Allow setup of any other TCP connection 213 ${fwcmd} add pass tcp from any to any setup 214 215 # Allow DNS queries out in the world 216 ${fwcmd} add pass udp from any 53 to ${oip} 217 ${fwcmd} add pass udp from ${oip} to any 53 218 219 # Allow NTP queries out in the world 220 ${fwcmd} add pass udp from any 123 to ${oip} 221 ${fwcmd} add pass udp from ${oip} to any 123 222 223 # Everything else is denied by default, unless the 224 # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel 225 # config file. 226 ;; 227 228[Uu][Nn][Kk][Nn][Oo][Ww][Nn]) 229 ;; 230*) 231 if [ -r "${firewall_type}" ]; then 232 ${fwcmd} ${firewall_type} 233 fi 234 ;; 235esac 236