| rc.firewall (50479) | rc.firewall (91853) |
|---|---|
| 1############ 2# Setup system for firewall service. 3# $FreeBSD: head/release/picobsd/floppy.tree/etc/rc.firewall 50479 1999-08-28 01:35:59Z peter $ | 1# $FreeBSD: head/release/picobsd/floppy.tree/etc/rc.firewall 91853 2002-03-08 05:15:08Z luigi $ |
| 4 | 2 |
| 5############ 6# Define the firewall type in /etc/rc.conf. Valid values are: | 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: |
| 7# open - will allow anyone in | 11# open - will allow anyone in |
| 8# client - will try to protect just this machine 9# simple - will try to protect a whole network | 12# client - will try to protect just this machine (should be customized). 13# simple - will try to protect a whole network (should be customized). |
| 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) 13# | 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# |
| 14# For ``client'' and ``simple'' the entries below should be customized 15# appropriately. | |
| 16 17############ | 18 19############ |
| 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# 25# O'Reilly & Associates, Inc 26# ISBN 1-56592-124-0 27# http://www.ora.com/ 28# 29# For a more advanced treatment of Internet Security read: 30# 31# Firewalls & Internet Security 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=$1 42fi 43 44############ 45# Set quiet mode if requested 46if [ "x$firewall_quiet" = "xYES" ]; then 47 fwcmd="/sbin/ipfw -q" 48else 49 fwcmd="/sbin/ipfw" 50fi 51 52############ 53# Flush out the list before we begin. 54$fwcmd -f flush 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 62# $fwcmd add 65000 pass all from any to any 63 64############ | |
| 65# Only in rare cases do you want to change these rules 66$fwcmd add 1000 pass all from any to any via lo0 67$fwcmd add 1010 deny all from 127.0.0.0/8 to 127.0.0.0/8 68 69 70# Prototype setups. | 20# Only in rare cases do you want to change these rules 21$fwcmd add 1000 pass all from any to any via lo0 22$fwcmd add 1010 deny all from 127.0.0.0/8 to 127.0.0.0/8 23 24 25# Prototype setups. |
| 71if [ "${firewall_type}" = "open" -o "${firewall_type}" = "OPEN" ]; then | 26case "${firewall_type}" in 27open|OPEN) 28 $fwcmd add 65000 pass all from any to any 29 ;; |
| 72 | 30 |
| 73 $fwcmd add 65000 pass all from any to any | 31client) |
| 74 | 32 |
| 75elif [ "${firewall_type}" = "client" ]; then 76 | |
| 77 ############ 78 # This is a prototype setup that will protect your system somewhat against 79 # people from outside your own network. 80 ############ 81 82 # set these to your network and netmask and ip 83 net="192.168.4.0" 84 mask="255.255.255.0" --- 19 unchanged lines hidden (view full) --- 104 $fwcmd add pass udp from any 53 to ${ip} 105 $fwcmd add pass udp from ${ip} to any 53 106 107 # Allow NTP queries out in the world 108 $fwcmd add pass udp from any 123 to ${ip} 109 $fwcmd add pass udp from ${ip} to any 123 110 111 # Everything else is denied as default. | 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" --- 19 unchanged lines hidden (view full) --- 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 $fwcmd add 65000 deny all from any to any 69 ;; |
|
| 112 | 70 |
| 113elif [ "${firewall_type}" = "simple" ]; then | 71simple) |
| 114 115 ############ 116 # This is a prototype setup for a simple firewall. Configure this machine 117 # as a named server and ntp server, and point all the machines on the inside 118 # at this machine for those services. 119 ############ 120 121 # set these to your outside interface network and netmask and ip --- 39 unchanged lines hidden (view full) --- 161 $fwcmd add pass udp from any 53 to ${oip} 162 $fwcmd add pass udp from ${oip} to any 53 163 164 # Allow NTP queries out in the world 165 $fwcmd add pass udp from any 123 to ${oip} 166 $fwcmd add pass udp from ${oip} to any 123 167 168 # Everything else is denied as default. | 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 --- 39 unchanged lines hidden (view full) --- 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 $fwcmd add 65000 deny all from any to any 128 ;; |
|
| 169 | 129 |
| 170elif [ "${firewall_type}" != "UNKNOWN" -a -r "${firewall_type}" ]; then | 130UNKNOWN|"") 131 echo "WARNING: firewall rules not loaded." 132 ;; 133 134*) # an absolute pathname ? 135 if [ -f "${firewall_type}" ] ; then |
| 171 $fwcmd ${firewall_type} | 136 $fwcmd ${firewall_type} |
| 172fi | 137 else 138 echo "WARNING: firewall config script (${firewall_type}) not found," 139 echo " firewall rules not loaded." 140 fi 141 ;; 142esac |