1# $FreeBSD: head/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
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