rc.firewall revision 302408
1# $FreeBSD: stable/11/release/picobsd/floppy.tree/etc/rc.firewall 91853 2002-03-08 05:15:08Z luigi $ 2 3# Setup system for firewall service, with some sample configurations. 4# Select one using ${firewall_type} which you can set in /etc/rc.conf.local. 5# 6# If you override this file with your own copy, you can use ${hostname} 7# as the key for the case statement. On entry, the firewall will be flushed 8# and $fwcmd will point to the appropriate command (usually /sbin/ipfw) 9# 10# Sample configurations are: 11# open - will allow anyone in 12# client - will try to protect just this machine (should be customized). 13# simple - will try to protect a whole network (should be customized). 14# closed - totally disables IP services except via lo0 interface 15# UNKNOWN - disables the loading of firewall rules. 16# filename - will load the rules in the given filename (full path required) 17# 18 19############ 20# Only in rare cases do you want to change these rules 21$fwcmd add 1000 pass all from any to any via lo0 22$fwcmd add 1010 deny all from 127.0.0.0/8 to 127.0.0.0/8 23 24 25# Prototype setups. 26case "${firewall_type}" in 27open|OPEN) 28 $fwcmd add 65000 pass all from any to any 29 ;; 30 31client) 32 33 ############ 34 # This is a prototype setup that will protect your system somewhat against 35 # people from outside your own network. 36 ############ 37 38 # set these to your network and netmask and ip 39 net="192.168.4.0" 40 mask="255.255.255.0" 41 ip="192.168.4.17" 42 43 # Allow any traffic to or from my own net. 44 $fwcmd add pass all from ${ip} to ${net}:${mask} 45 $fwcmd add pass all from ${net}:${mask} to ${ip} 46 47 # Allow TCP through if setup succeeded 48 $fwcmd add pass tcp from any to any established 49 50 # Allow setup of incoming email 51 $fwcmd add pass tcp from any to ${ip} 25 setup 52 53 # Allow setup of outgoing TCP connections only 54 $fwcmd add pass tcp from ${ip} to any setup 55 56 # Disallow setup of all other TCP connections 57 $fwcmd add deny tcp from any to any setup 58 59 # Allow DNS queries out in the world 60 $fwcmd add pass udp from any 53 to ${ip} 61 $fwcmd add pass udp from ${ip} to any 53 62 63 # Allow NTP queries out in the world 64 $fwcmd add pass udp from any 123 to ${ip} 65 $fwcmd add pass udp from ${ip} to any 123 66 67 # Everything else is denied as default. 68 $fwcmd add 65000 deny all from any to any 69 ;; 70 71simple) 72 73 ############ 74 # This is a prototype setup for a simple firewall. Configure this machine 75 # as a named server and ntp server, and point all the machines on the inside 76 # at this machine for those services. 77 ############ 78 79 # set these to your outside interface network and netmask and ip 80 oif="ed0" 81 onet="192.168.4.0" 82 omask="255.255.255.0" 83 oip="192.168.4.17" 84 85 # set these to your inside interface network and netmask and ip 86 iif="ed1" 87 inet="192.168.3.0" 88 imask="255.255.255.0" 89 iip="192.168.3.17" 90 91 # Stop spoofing 92 $fwcmd add deny all from ${inet}:${imask} to any in via ${oif} 93 $fwcmd add deny all from ${onet}:${omask} to any in via ${iif} 94 95 # Stop RFC1918 nets on the outside interface 96 $fwcmd add deny all from 192.168.0.0:255.255.0.0 to any via ${oif} 97 $fwcmd add deny all from 172.16.0.0:255.240.0.0 to any via ${oif} 98 $fwcmd add deny all from 10.0.0.0:255.0.0.0 to any via ${oif} 99 100 # Allow TCP through if setup succeeded 101 $fwcmd add pass tcp from any to any established 102 103 # Allow setup of incoming email 104 $fwcmd add pass tcp from any to ${oip} 25 setup 105 106 # Allow access to our DNS 107 $fwcmd add pass tcp from any to ${oip} 53 setup 108 109 # Allow access to our WWW 110 $fwcmd add pass tcp from any to ${oip} 80 setup 111 112 # Reject&Log all setup of incoming connections from the outside 113 $fwcmd add deny log tcp from any to any in via ${oif} setup 114 115 # Allow setup of any other TCP connection 116 $fwcmd add pass tcp from any to any setup 117 118 # Allow DNS queries out in the world 119 $fwcmd add pass udp from any 53 to ${oip} 120 $fwcmd add pass udp from ${oip} to any 53 121 122 # Allow NTP queries out in the world 123 $fwcmd add pass udp from any 123 to ${oip} 124 $fwcmd add pass udp from ${oip} to any 123 125 126 # Everything else is denied as default. 127 $fwcmd add 65000 deny all from any to any 128 ;; 129 130UNKNOWN|"") 131 echo "WARNING: firewall rules not loaded." 132 ;; 133 134*) # an absolute pathname ? 135 if [ -f "${firewall_type}" ] ; then 136 $fwcmd ${firewall_type} 137 else 138 echo "WARNING: firewall config script (${firewall_type}) not found," 139 echo " firewall rules not loaded." 140 fi 141 ;; 142esac 143