rc.firewall revision 51805
127897Sfsmp############ 2208291Suqs# Setup system for firewall service. 327897Sfsmp# $FreeBSD: head/etc/rc.firewall 51805 1999-09-30 04:55:23Z mpp $ 427897Sfsmp 527897Sfsmp# Suck in the configuration variables. 627897Sfsmpif [ -r /etc/defaults/rc.conf ]; then 727897Sfsmp . /etc/defaults/rc.conf 827897Sfsmpelif [ -r /etc/rc.conf ]; then 927897Sfsmp . /etc/rc.conf 1027897Sfsmpfi 1127897Sfsmp 1227897Sfsmp############ 1327897Sfsmp# Define the firewall type in /etc/rc.conf. Valid values are: 1427897Sfsmp# open - will allow anyone in 1527897Sfsmp# client - will try to protect just this machine 1627897Sfsmp# simple - will try to protect a whole network 1727897Sfsmp# closed - totally disables IP services except via lo0 interface 1827897Sfsmp# UNKNOWN - disables the loading of firewall rules. 1927897Sfsmp# filename - will load the rules in the given filename (full path required) 2027897Sfsmp# 2127897Sfsmp# For ``client'' and ``simple'' the entries below should be customized 2252676Sphantom# appropriately. 2348795Snik 2450476Speter############ 2548795Snik# 26191953Sivoras# If you don't know enough about packet filtering, we suggest that you 2727897Sfsmp# take time to read this book: 2879538Sru# 2927897Sfsmp# Building Internet Firewalls 3027897Sfsmp# Brent Chapman and Elizabeth Zwicky 31138999Sjkoshy# 3227897Sfsmp# O'Reilly & Associates, Inc 33107664Srwatson# ISBN 1-56592-124-0 3427897Sfsmp# http://www.ora.com/ 3527897Sfsmp# 3679727Sschweikh# For a more advanced treatment of Internet Security read: 37138999Sjkoshy# 3827897Sfsmp# Firewalls & Internet Security 39113820Sjhb# Repelling the wily hacker 40107700Sru# William R. Cheswick, Steven M. Bellowin 41107700Sru# 42158621Swilko# Addison-Wesley 43107664Srwatson# ISBN 0-201-6337-4 44107664Srwatson# http://www.awl.com/ 45127378Sjhb# 46127378Sjhb 47127378Sjhbif [ -n "${1}" ]; then 48107663Srwatson firewall_type="${1}" 4927897Sfsmpfi 5027897Sfsmp 5127897Sfsmp############ 52107664Srwatson# Set quiet mode if requested 53107664Srwatson# 54107664Srwatsoncase ${firewall_quiet} in 55127378Sjhb[Yy][Ee][Ss]) 56107664Srwatson fwcmd="/sbin/ipfw -q" 57107663Srwatson ;; 58107663Srwatson*) 59113820Sjhb fwcmd="/sbin/ipfw" 60138999Sjkoshy ;; 61138999Sjkoshyesac 62138999Sjkoshy 63138999Sjkoshy############ 64113820Sjhb# Flush out the list before we begin. 65138999Sjkoshy# 66224528Savg${fwcmd} -f flush 67224528Savg 68224528Savg############ 69224528Savg# These rules are required for using natd. All packets are passed to 70138999Sjkoshy# natd before they encounter your remaining rules. The firewall rules 71138999Sjkoshy# will then be run again on each packet after translation by natd, 72191953Sivoras# minus any divert rules (see natd(8)). 73191953Sivoras# 74191953Sivorascase ${natd_enable} in 75191953Sivoras[Yy][Ee][Ss]) 76191953Sivoras if [ -n "${natd_interface}" ]; then 77191953Sivoras ${fwcmd} add divert natd all from any to any via ${natd_interface} 78191953Sivoras fi 79191953Sivoras ;; 80191953Sivorasesac 81191953Sivoras 82191953Sivoras############ 83191953Sivoras# If you just configured ipfw in the kernel as a tool to solve network 84191953Sivoras# problems or you just want to disallow some particular kinds of traffic 85191953Sivoras# then you will want to change the default policy to open. You can also 86191953Sivoras# do this as your only action by setting the firewall_type to ``open''. 87191953Sivoras# 88191953Sivoras# ${fwcmd} add 65000 pass all from any to any 89191953Sivoras 90191953Sivoras############ 91191953Sivoras# Only in rare cases do you want to change these rules 92191953Sivoras# 93191953Sivoras${fwcmd} add 100 pass all from any to any via lo0 94191953Sivoras${fwcmd} add 200 deny all from any to 127.0.0.0/8 95191953Sivoras 96191953Sivoras 97191953Sivoras# Prototype setups. 98191953Sivoras# 99191953Sivorascase ${firewall_type} in 100191953Sivoras[Oo][Pp][Ee][Nn]) 101191953Sivoras ${fwcmd} add 65000 pass all from any to any 102191953Sivoras ;; 103191953Sivoras[Cc][Ll][Ii][Ee][Nn][Tt]) 104191953Sivoras 105191953Sivoras ############ 106191953Sivoras # This is a prototype setup that will protect your system somewhat 107191953Sivoras # against people from outside your own network. 108191953Sivoras ############ 109191953Sivoras 110191953Sivoras # set these to your network and netmask and ip 111191953Sivoras net="192.168.4.0" 112191953Sivoras mask="255.255.255.0" 113191953Sivoras ip="192.168.4.17" 114191953Sivoras 115191953Sivoras # Allow any traffic to or from my own net. 116191953Sivoras ${fwcmd} add pass all from ${ip} to ${net}:${mask} 117191953Sivoras ${fwcmd} add pass all from ${net}:${mask} to ${ip} 118191953Sivoras 119191953Sivoras # Allow TCP through if setup succeeded 120191953Sivoras ${fwcmd} add pass tcp from any to any established 121138999Sjkoshy 122191953Sivoras # Allow setup of incoming email 123225902Sgabor ${fwcmd} add pass tcp from any to ${ip} 25 setup 124130582Sru 125224528Savg # Allow setup of outgoing TCP connections only 126224528Savg ${fwcmd} add pass tcp from ${ip} to any setup 12727897Sfsmp 128225902Sgabor # Disallow setup of all other TCP connections 12929966Swosch ${fwcmd} add deny tcp from any to any setup 130225902Sgabor 131225902Sgabor # Allow DNS queries out in the world 132224528Savg ${fwcmd} add pass udp from any 53 to ${ip} 133138999Sjkoshy ${fwcmd} add pass udp from ${ip} to any 53 134107663Srwatson 135107663Srwatson # Allow NTP queries out in the world 136107663Srwatson ${fwcmd} add pass udp from any 123 to ${ip} 137107663Srwatson ${fwcmd} add pass udp from ${ip} to any 123 138225902Sgabor 139107663Srwatson # Everything else is denied by default, unless the 140225902Sgabor # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel 14127897Sfsmp # config file. 14227897Sfsmp ;; 14327897Sfsmp 144117011Sru[Ss][Ii][Mm][Pp][Ll][Ee]) 145117011Sru 14627897Sfsmp ############ 147117011Sru # This is a prototype setup for a simple firewall. Configure this 148117011Sru # machine as a named server and ntp server, and point all the machines 14927897Sfsmp # on the inside at this machine for those services. 150107663Srwatson ############ 151107663Srwatson 152107663Srwatson # set these to your outside interface network and netmask and ip 153107663Srwatson oif="ed0" 154107663Srwatson onet="192.168.4.0" 155107663Srwatson omask="255.255.255.0" 156107663Srwatson oip="192.168.4.17" 157107700Sru 158107700Sru # set these to your inside interface network and netmask and ip 159113820Sjhb iif="ed1" 160113820Sjhb inet="192.168.3.0" 161162404Sru imask="255.255.255.0" 16227897Sfsmp iip="192.168.3.17" 16334504Scharnier 164 # Stop spoofing 165 ${fwcmd} add deny all from ${inet}:${imask} to any in via ${oif} 166 ${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif} 167 168 # Stop RFC1918 nets on the outside interface 169 ${fwcmd} add deny all from 192.168.0.0:255.255.0.0 to any via ${oif} 170 ${fwcmd} add deny all from any to 192.168.0.0:255.255.0.0 via ${oif} 171 ${fwcmd} add deny all from 172.16.0.0:255.240.0.0 to any via ${oif} 172 ${fwcmd} add deny all from any to 172.16.0.0:255.240.0.0 via ${oif} 173 ${fwcmd} add deny all from 10.0.0.0:255.0.0.0 to any via ${oif} 174 ${fwcmd} add deny all from any to 10.0.0.0:255.0.0.0 via ${oif} 175 176 # Allow TCP through if setup succeeded 177 ${fwcmd} add pass tcp from any to any established 178 179 # Allow setup of incoming email 180 ${fwcmd} add pass tcp from any to ${oip} 25 setup 181 182 # Allow access to our DNS 183 ${fwcmd} add pass tcp from any to ${oip} 53 setup 184 185 # Allow access to our WWW 186 ${fwcmd} add pass tcp from any to ${oip} 80 setup 187 188 # Reject&Log all setup of incoming connections from the outside 189 ${fwcmd} add deny log tcp from any to any in via ${oif} setup 190 191 # Allow setup of any other TCP connection 192 ${fwcmd} add pass tcp from any to any setup 193 194 # Allow DNS queries out in the world 195 ${fwcmd} add pass udp from any 53 to ${oip} 196 ${fwcmd} add pass udp from ${oip} to any 53 197 198 # Allow NTP queries out in the world 199 ${fwcmd} add pass udp from any 123 to ${oip} 200 ${fwcmd} add pass udp from ${oip} to any 123 201 202 # Everything else is denied by default, unless the 203 # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel 204 # config file. 205 ;; 206 207[Uu][Nn][Kk][Nn][Oo][Ww][Nn]) 208 ;; 209*) 210 if [ -r "${firewall_type}" ]; then 211 ${fwcmd} ${firewall_type} 212 fi 213 ;; 214esac 215