1############
2# Setup system for firewall service.
| 1############
2# Setup system for firewall service.
|
3# $Id: rc.firewall,v 1.1 1996/04/03 17:13:58 phk Exp $
| 3# $Id: rc.firewall,v 1.2 1996/04/12 09:16:42 phk Exp $
|
4
5############
6#
7# >>Warning<<
8# This file is not very old yet, and have been put together without much
9# test of the contents.
10
11############
12#
13# If you don't know enough about packet filtering, we suggest that you
14# take time to read this book:
15#
16# Building Internet Firewalls
17# Brent Chapman and Elizabeth Zwicky
18#
19# O'Reilly & Associates, Inc
20# ISBN 1-56592-124-0
21#
22# For a more advanced treatment of Internet Security read:
23#
24# Firewalls & Internet Security
25# Repelling the wily hacker
26# William R. Cheswick, Steven M. Bellowin
27#
28# Addison-Wesley
29# ISBN 0-201-6337-4
30#
31
32############
| 4
5############
6#
7# >>Warning<<
8# This file is not very old yet, and have been put together without much
9# test of the contents.
10
11############
12#
13# If you don't know enough about packet filtering, we suggest that you
14# take time to read this book:
15#
16# Building Internet Firewalls
17# Brent Chapman and Elizabeth Zwicky
18#
19# O'Reilly & Associates, Inc
20# ISBN 1-56592-124-0
21#
22# For a more advanced treatment of Internet Security read:
23#
24# Firewalls & Internet Security
25# Repelling the wily hacker
26# William R. Cheswick, Steven M. Bellowin
27#
28# Addison-Wesley
29# ISBN 0-201-6337-4
30#
31
32############
|
| 33# Flush out the list before we begin.
34/sbin/ipfw flush
35
36############
|
33# If you just configured ipfw in the kernel as a tool to solve network
34# problems or you just want to disallow some particular kinds of traffic
35# they you will want to change the default policy to open.
36
37# /sbin/ipfw add 65000 pass all from any to any
38
39############
40# Only in rare cases do you want to change this rule
41/sbin/ipfw add 1000 pass all from 127.0.0.1 to 127.0.0.1
42
43############
44# This is a prototype setup that will protect your system somewhat against
45# people from outside your own network.
46#
47# To enable simply change "false" to "true" in the if line and set the
48# variables to your network parameters
49
50if false ; then
51 # set these to your network and netmask and ip
52 net="192.168.4.0"
53 mask="255.255.255.0"
54 ip="192.168.4.17"
55
56 # Allow any traffic to or from my own net.
57 /sbin/ipfw add pass all from ${ip} to ${net}:${mask}
58 /sbin/ipfw add pass all from ${net}:${mask} to ${ip}
59
60 # Allow TCP through if setup succeeded
61 /sbin/ipfw add pass tcp from any to any established
62
63 # Allow setup of incoming email
64 /sbin/ipfw add pass tcp from any to ${ip} 25 setup
65
66 # Allow setup of outgoing TCP connections only
67 /sbin/ipfw add pass tcp from ${ip} to any setup
68
69 # Disallow setup of all other TCP connections
70 /sbin/ipfw add deny tcp from any to any setup
71
72 # Allow DNS queries out in the world
73 /sbin/ipfw add pass udp from any 53 to ${ip}
74 /sbin/ipfw add pass udp from ${ip} to any 53
75
76 # Allow NTP queries out in the world
77 /sbin/ipfw add pass udp from any 123 to ${ip}
78 /sbin/ipfw add pass udp from ${ip} to any 123
79
80 # Everyting else is denied as default.
81fi
82
83############
84# This is a prototype setup for a simple firewall. Configure this machine
85# as a named server and ntp server, and point all the machines on the inside
86# at this machine for those services.
87#
88# To enable simply change "false" to "true" in the if line and set the
89# variables to your network parameters
90
91if false ; then
92 # set these to your outside interface network and netmask and ip
93 oif="ed0"
94 onet="192.168.4.0"
95 omask="255.255.255.0"
96 oip="192.168.4.17"
97
98 # set these to your inside interface network and netmask and ip
99 iif="ed1"
100 inet="192.168.3.0"
101 imask="255.255.255.0"
102 iip="192.168.3.17"
103
104 # Stop spoofing
105 /sbin/ipfw add deny all from ${inet}:${imask} to any in via ${oif}
106 /sbin/ipfw add deny all from ${onet}:${omask} to any in via ${iif}
107
108 # Stop RFC1918 nets on the outside interface
109 /sbin/ipfw add deny all from 192.168.0.0:255.255.0.0 to any via ${oif}
110 /sbin/ipfw add deny all from 172.16.0.0:255.240.0.0 to any via ${oif}
111 /sbin/ipfw add deny all from 10.0.0.0:255.0.0.0 to any via ${oif}
112
113 # Allow TCP through if setup succeeded
114 /sbin/ipfw add pass tcp from any to any established
115
116 # Allow setup of incoming email
117 /sbin/ipfw add pass tcp from any to ${oip} 25 setup
118
119 # Allow access to our DNS
120 /sbin/ipfw add pass tcp from any to ${oip} 53 setup
121
122 # Allow access to our WWW
123 /sbin/ipfw add pass tcp from any to ${oip} 80 setup
124
125 # Reject&Log all setup of incoming connections from the outside
126 /sbin/ipfw add deny log tcp from any to any in via ${oif} setup
127
128 # Allow setup of any other TCP connection
129 /sbin/ipfw add pass tcp from any to any setup
130
131 # Allow DNS queries out in the world
132 /sbin/ipfw add pass udp from any 53 to ${oip}
133 /sbin/ipfw add pass udp from ${oip} to any 53
134
135 # Allow NTP queries out in the world
136 /sbin/ipfw add pass udp from any 123 to ${oip}
137 /sbin/ipfw add pass udp from ${oip} to any 123
138
139 # Everyting else is denied as default.
140fi
141
| 37# If you just configured ipfw in the kernel as a tool to solve network
38# problems or you just want to disallow some particular kinds of traffic
39# they you will want to change the default policy to open.
40
41# /sbin/ipfw add 65000 pass all from any to any
42
43############
44# Only in rare cases do you want to change this rule
45/sbin/ipfw add 1000 pass all from 127.0.0.1 to 127.0.0.1
46
47############
48# This is a prototype setup that will protect your system somewhat against
49# people from outside your own network.
50#
51# To enable simply change "false" to "true" in the if line and set the
52# variables to your network parameters
53
54if false ; then
55 # set these to your network and netmask and ip
56 net="192.168.4.0"
57 mask="255.255.255.0"
58 ip="192.168.4.17"
59
60 # Allow any traffic to or from my own net.
61 /sbin/ipfw add pass all from ${ip} to ${net}:${mask}
62 /sbin/ipfw add pass all from ${net}:${mask} to ${ip}
63
64 # Allow TCP through if setup succeeded
65 /sbin/ipfw add pass tcp from any to any established
66
67 # Allow setup of incoming email
68 /sbin/ipfw add pass tcp from any to ${ip} 25 setup
69
70 # Allow setup of outgoing TCP connections only
71 /sbin/ipfw add pass tcp from ${ip} to any setup
72
73 # Disallow setup of all other TCP connections
74 /sbin/ipfw add deny tcp from any to any setup
75
76 # Allow DNS queries out in the world
77 /sbin/ipfw add pass udp from any 53 to ${ip}
78 /sbin/ipfw add pass udp from ${ip} to any 53
79
80 # Allow NTP queries out in the world
81 /sbin/ipfw add pass udp from any 123 to ${ip}
82 /sbin/ipfw add pass udp from ${ip} to any 123
83
84 # Everyting else is denied as default.
85fi
86
87############
88# This is a prototype setup for a simple firewall. Configure this machine
89# as a named server and ntp server, and point all the machines on the inside
90# at this machine for those services.
91#
92# To enable simply change "false" to "true" in the if line and set the
93# variables to your network parameters
94
95if false ; then
96 # set these to your outside interface network and netmask and ip
97 oif="ed0"
98 onet="192.168.4.0"
99 omask="255.255.255.0"
100 oip="192.168.4.17"
101
102 # set these to your inside interface network and netmask and ip
103 iif="ed1"
104 inet="192.168.3.0"
105 imask="255.255.255.0"
106 iip="192.168.3.17"
107
108 # Stop spoofing
109 /sbin/ipfw add deny all from ${inet}:${imask} to any in via ${oif}
110 /sbin/ipfw add deny all from ${onet}:${omask} to any in via ${iif}
111
112 # Stop RFC1918 nets on the outside interface
113 /sbin/ipfw add deny all from 192.168.0.0:255.255.0.0 to any via ${oif}
114 /sbin/ipfw add deny all from 172.16.0.0:255.240.0.0 to any via ${oif}
115 /sbin/ipfw add deny all from 10.0.0.0:255.0.0.0 to any via ${oif}
116
117 # Allow TCP through if setup succeeded
118 /sbin/ipfw add pass tcp from any to any established
119
120 # Allow setup of incoming email
121 /sbin/ipfw add pass tcp from any to ${oip} 25 setup
122
123 # Allow access to our DNS
124 /sbin/ipfw add pass tcp from any to ${oip} 53 setup
125
126 # Allow access to our WWW
127 /sbin/ipfw add pass tcp from any to ${oip} 80 setup
128
129 # Reject&Log all setup of incoming connections from the outside
130 /sbin/ipfw add deny log tcp from any to any in via ${oif} setup
131
132 # Allow setup of any other TCP connection
133 /sbin/ipfw add pass tcp from any to any setup
134
135 # Allow DNS queries out in the world
136 /sbin/ipfw add pass udp from any 53 to ${oip}
137 /sbin/ipfw add pass udp from ${oip} to any 53
138
139 # Allow NTP queries out in the world
140 /sbin/ipfw add pass udp from any 123 to ${oip}
141 /sbin/ipfw add pass udp from ${oip} to any 123
142
143 # Everyting else is denied as default.
144fi
145
|