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rc.firewall


From: <andy@xxxxxxxxxxxxxxx>
Date: 21 Oct 2004 20:28:33 -0000

Hoi,

this replaces rc.firewall so that it doesn't need to be
modified anymore and can be used with rc.conf variables.

Andy

http://ftp.fortunaty.net/DragonFly/inofficial/patches/rc.firewall.patch

Index: etc/rc.firewall
===================================================================
RCS file: /home/dcvs/src/etc/rc.firewall,v
retrieving revision 1.2
diff -u -p -r1.2 rc.firewall
--- etc/rc.firewall	17 Jun 2003 04:24:45 -0000	1.2
+++ etc/rc.firewall	9 Oct 2004 14:51:13 -0000
@@ -1,303 +1,179 @@
 #!/bin/sh
-# Copyright (c) 1996  Poul-Henning Kamp
-# All rights reserved.
 #
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-# 1. Redistributions of source code must retain the above copyright
-#    notice, this list of conditions and the following disclaimer.
-# 2. Redistributions in binary form must reproduce the above copyright
-#    notice, this list of conditions and the following disclaimer in the
-#    documentation and/or other materials provided with the distribution.
+# /etc/rc.d/netfilter
 #
-# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-# SUCH DAMAGE.
+# A simple packetfilter configurable via /etc/rc.conf
 #
-# $FreeBSD: src/etc/rc.firewall,v 1.30.2.16 2003/02/10 05:45:06 trhodes Exp $
-# $DragonFly: src/etc/rc.firewall,v 1.2 2003/06/17 04:24:45 dillon Exp $
+# Variables in rc.conf:
 #
+# firewall_type
+#     UNKNOWN  - disables the loading of firewall rules.
+#     open     - will allow anyone in
+#     client   - enables the packetfilter
+#     simple   - enables the packetfilter
+#     closed   - totally disables IP services except via lo0 interface
+#     filename - will load the rules in the given filename (full path required)
+#
+#  firewall_trusted_nets
+#  firewall_trusted_interfaces
+#  firewall_allowed_icmp_types
+#  firewall_open_tcp_ports
+#  firewall_open_udp_ports
 
-#
-# Setup system for firewall service.
-#
 
-# Suck in the configuration variables.
 if [ -z "${source_rc_confs_defined}" ]; then
-	if [ -r /etc/defaults/rc.conf ]; then
-		. /etc/defaults/rc.conf
-		source_rc_confs
-	elif [ -r /etc/rc.conf ]; then
-		. /etc/rc.conf
-	fi
+        if [ -r /etc/defaults/rc.conf ]; then
+                . /etc/defaults/rc.conf
+                source_rc_confs
+        elif [ -r /etc/rc.conf ]; then
+                . /etc/rc.conf
+        fi
 fi
 
-############
-# Define the firewall type in /etc/rc.conf.  Valid values are:
-#   open     - will allow anyone in
-#   client   - will try to protect just this machine
-#   simple   - will try to protect a whole network
-#   closed   - totally disables IP services except via lo0 interface
-#   UNKNOWN  - disables the loading of firewall rules.
-#   filename - will load the rules in the given filename (full path required)
-#
-# For ``client'' and ``simple'' the entries below should be customized
-# appropriately.
+case ${firewall_quiet} in
+[Yy][Ee][Ss])
+        fwcmd="/sbin/ipfw -q"
+        ;;
+*)
+        fwcmd="/sbin/ipfw"
+        ;;
+esac
 
-############
-#
-# If you don't know enough about packet filtering, we suggest that you
-# take time to read this book:
-#
-#	Building Internet Firewalls, 2nd Edition
-#	Brent Chapman and Elizabeth Zwicky
-#
-#	O'Reilly & Associates, Inc
-#	ISBN 1-56592-871-7
-#	http://www.ora.com/
-#	http://www.oreilly.com/catalog/fire2/
-#
-# For a more advanced treatment of Internet Security read:
-#
-#	Firewalls & Internet Security
-#	Repelling the wily hacker
-#	William R. Cheswick, Steven M. Bellowin
-#
-#	Addison-Wesley
-#	ISBN 0-201-63357-4
-#	http://www.awl.com/
-#	http://www.awlonline.com/product/0%2C2627%2C0201633574%2C00.html
-#
+case ${firewall_logging} in
+[Yy][Ee][Ss])
+        log="log"
+        ;;
+*)
+        log=""
+        ;;
+esac
 
-setup_loopback () {
-	############
-	# Only in rare cases do you want to change these rules
-	#
-	${fwcmd} add 100 pass all from any to any via lo0
-	${fwcmd} add 200 deny all from any to 127.0.0.0/8
-	${fwcmd} add 300 deny ip from 127.0.0.0/8 to any
+# we handle start, stop, firewall_type and nothing as argument
+if [ -n "$1" ]; then
+    case $1 in
+        start)
+        ;;
+        stop)
+        firewall_type="open"
+        ;;
+        *)
+        firewall_type="$1"
+        ;;
+    esac
+fi
+
+allow_loopback() {
+    ${fwcmd} add pass all from any to any via lo0
+    ${fwcmd} add deny ${log} all from any to 127.0.0.0/8
+    ${fwcmd} add deny ${log} ip from 127.0.0.0/8 to any
+}
+
+deny_spoof() {
+    # XXX we don't have verrevpath yet
+    # ${fwcmd} add deny ${log} ip from any to any not verrevpath in
+    echo no verrevpath yet, so no anti-spoof
+}
+
+allow_icmp_types() {
+    for type in $*; do
+        ${fwcmd} add allow icmp from any to any icmptypes ${type}
+    done
+}
+
+allow_trusted_nets() {
+    for net in $*; do
+        ${fwcmd} add pass all from me to ${net}
+        ${fwcmd} add pass all from ${net} to me
+    done
+}
+
+allow_trusted_interfaces() {
+    for interface in $*; do
+        ${fwcmd} add pass all from any to any via ${interface}
+    done
+}
+
+allow_connections() {
+    ${fwcmd} add pass tcp from any to any established
+    ${fwcmd} add pass all from any to any frag
+    ${fwcmd} add pass tcp from me to any setup
+    ${fwcmd} add pass udp from me to any keep-state
+}
+
+open_tcp_ports() {
+    for port in $*; do
+        ${fwcmd} add pass tcp from any to me ${port} setup
+    done
+}
+
+open_udp_ports() {
+    for port in $*; do
+        ${fwcmd} add pass udp from any to me ${port}
+        ${fwcmd} add pass udp from me ${port} to any
+    done
+}
+
+deny_not_routed_nets()
+{
+    # These nets should not be routed
+    nets="10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 0.0.0.0/8 \
+        169.254.0.0/16 192.0.2.0/24 224.0.0.0/4 240.0.0.0/4"
+    for net in ${nets} ; do
+        ${fwcmd} add deny ${log} all from any to $net
+    done
+}
+
+deny_rest() {
+    ${fwcmd} add 65000 deny ${log} all from any to any
 }
 
-if [ -n "${1}" ]; then
-	firewall_type="${1}"
-fi
 
-############
-# Set quiet mode if requested
-#
-case ${firewall_quiet} in
-[Yy][Ee][Ss])
-	fwcmd="/sbin/ipfw -q"
-	;;
-*)
-	fwcmd="/sbin/ipfw"
-	;;
-esac
 
-############
-# Flush out the list before we begin.
-#
 ${fwcmd} -f flush
 
-############
-# Network Address Translation.  All packets are passed to natd(8)
-# before they encounter your remaining rules.  The firewall rules
-# will then be run again on each packet after translation by natd
-# starting at the rule number following the divert rule.
-#
-# For ``simple'' firewall type the divert rule should be put to a
-# different place to not interfere with address-checking rules.
-#
 case ${firewall_type} in
-[Oo][Pp][Ee][Nn]|[Cc][Ll][Ii][Ee][Nn][Tt])
-	case ${natd_enable} in
-	[Yy][Ee][Ss])
-		if [ -n "${natd_interface}" ]; then
-			${fwcmd} add 50 divert natd all from any to any via ${natd_interface}
-		fi
-		;;
-	esac
+    [Oo][Pp][Ee][Nn]|[Cc][Ll][Ii][Ee][Nn][Tt])
+    case ${natd_enable} in
+        [Yy][Ee][Ss])
+        if [ -n "${natd_interface}" ]; then
+            ${fwcmd} add 50 divert natd all from any to any via ${natd_interface}
+        fi
+        ;;
+    esac
 esac
 
-############
-# If you just configured ipfw in the kernel as a tool to solve network
-# problems or you just want to disallow some particular kinds of traffic
-# then you will want to change the default policy to open.  You can also
-# do this as your only action by setting the firewall_type to ``open''.
-#
-# ${fwcmd} add 65000 pass all from any to any
-
-
-# Prototype setups.
-#
 case ${firewall_type} in
-[Oo][Pp][Ee][Nn])
-	setup_loopback
-	${fwcmd} add 65000 pass all from any to any
-	;;
-
-[Cc][Ll][Ii][Ee][Nn][Tt])
-	############
-	# This is a prototype setup that will protect your system somewhat
-	# against people from outside your own network.
-	############
-
-	# set these to your network and netmask and ip
-	net="192.0.2.0"
-	mask="255.255.255.0"
-	ip="192.0.2.1"
-
-	setup_loopback
-
-	# Allow any traffic to or from my own net.
-	${fwcmd} add pass all from ${ip} to ${net}:${mask}
-	${fwcmd} add pass all from ${net}:${mask} to ${ip}
-
-	# Allow TCP through if setup succeeded
-	${fwcmd} add pass tcp from any to any established
-
-	# Allow IP fragments to pass through
-	${fwcmd} add pass all from any to any frag
-
-	# Allow setup of incoming email
-	${fwcmd} add pass tcp from any to ${ip} 25 setup
-
-	# Allow setup of outgoing TCP connections only
-	${fwcmd} add pass tcp from ${ip} to any setup
-
-	# Disallow setup of all other TCP connections
-	${fwcmd} add deny tcp from any to any setup
-
-	# Allow DNS queries out in the world
-	${fwcmd} add pass udp from ${ip} to any 53 keep-state
-
-	# Allow NTP queries out in the world
-	${fwcmd} add pass udp from ${ip} to any 123 keep-state
-
-	# Everything else is denied by default, unless the
-	# IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
-	# config file.
-	;;
-
-[Ss][Ii][Mm][Pp][Ll][Ee])
-	############
-	# This is a prototype setup for a simple firewall.  Configure this
-	# machine as a named server and ntp server, and point all the machines
-	# on the inside at this machine for those services.
-	############
-
-	# set these to your outside interface network and netmask and ip
-	oif="ed0"
-	onet="192.0.2.0"
-	omask="255.255.255.240"
-	oip="192.0.2.1"
-
-	# set these to your inside interface network and netmask and ip
-	iif="ed1"
-	inet="192.0.2.16"
-	imask="255.255.255.240"
-	iip="192.0.2.17"
-
-	setup_loopback
-
-	# Stop spoofing
-	${fwcmd} add deny all from ${inet}:${imask} to any in via ${oif}
-	${fwcmd} add deny all from ${onet}:${omask} to any in via ${iif}
-
-	# Stop RFC1918 nets on the outside interface
-	${fwcmd} add deny all from any to 10.0.0.0/8 via ${oif}
-	${fwcmd} add deny all from any to 172.16.0.0/12 via ${oif}
-	${fwcmd} add deny all from any to 192.168.0.0/16 via ${oif}
-
-	# Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
-	# DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
-	# on the outside interface
-	${fwcmd} add deny all from any to 0.0.0.0/8 via ${oif}
-	${fwcmd} add deny all from any to 169.254.0.0/16 via ${oif}
-	${fwcmd} add deny all from any to 192.0.2.0/24 via ${oif}
-	${fwcmd} add deny all from any to 224.0.0.0/4 via ${oif}
-	${fwcmd} add deny all from any to 240.0.0.0/4 via ${oif}
-
-	# Network Address Translation.  This rule is placed here deliberately
-	# so that it does not interfere with the surrounding address-checking
-	# rules.  If for example one of your internal LAN machines had its IP
-	# address set to 192.0.2.1 then an incoming packet for it after being
-	# translated by natd(8) would match the `deny' rule above.  Similarly
-	# an outgoing packet originated from it before being translated would
-	# match the `deny' rule below.
-	case ${natd_enable} in
-	[Yy][Ee][Ss])
-		if [ -n "${natd_interface}" ]; then
-			${fwcmd} add divert natd all from any to any via ${natd_interface}
-		fi
-		;;
-	esac
-
-	# Stop RFC1918 nets on the outside interface
-	${fwcmd} add deny all from 10.0.0.0/8 to any via ${oif}
-	${fwcmd} add deny all from 172.16.0.0/12 to any via ${oif}
-	${fwcmd} add deny all from 192.168.0.0/16 to any via ${oif}
-
-	# Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
-	# DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
-	# on the outside interface
-	${fwcmd} add deny all from 0.0.0.0/8 to any via ${oif}
-	${fwcmd} add deny all from 169.254.0.0/16 to any via ${oif}
-	${fwcmd} add deny all from 192.0.2.0/24 to any via ${oif}
-	${fwcmd} add deny all from 224.0.0.0/4 to any via ${oif}
-	${fwcmd} add deny all from 240.0.0.0/4 to any via ${oif}
-
-	# Allow TCP through if setup succeeded
-	${fwcmd} add pass tcp from any to any established
-
-	# Allow IP fragments to pass through
-	${fwcmd} add pass all from any to any frag
-
-	# Allow setup of incoming email
-	${fwcmd} add pass tcp from any to ${oip} 25 setup
-
-	# Allow access to our DNS
-	${fwcmd} add pass tcp from any to ${oip} 53 setup
-	${fwcmd} add pass udp from any to ${oip} 53
-	${fwcmd} add pass udp from ${oip} 53 to any
-
-	# Allow access to our WWW
-	${fwcmd} add pass tcp from any to ${oip} 80 setup
-
-	# Reject&Log all setup of incoming connections from the outside
-	${fwcmd} add deny log tcp from any to any in via ${oif} setup
-
-	# Allow setup of any other TCP connection
-	${fwcmd} add pass tcp from any to any setup
-
-	# Allow DNS queries out in the world
-	${fwcmd} add pass udp from ${oip} to any 53 keep-state
-
-	# Allow NTP queries out in the world
-	${fwcmd} add pass udp from ${oip} to any 123 keep-state
-
-	# Everything else is denied by default, unless the
-	# IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
-	# config file.
-	;;
-
-[Cc][Ll][Oo][Ss][Ee][Dd])
-	setup_loopback
-	;;
-[Uu][Nn][Kk][Nn][Oo][Ww][Nn])
-	;;
-*)
-	if [ -r "${firewall_type}" ]; then
-		${fwcmd} ${firewall_flags} ${firewall_type}
-	fi
-	;;
+    [Oo][Pp][Ee][Nn])
+        allow_loopback
+        deny_spoof
+        ${fwcmd} add 1 pass all from any to any
+    ;;
+
+    # historical names
+    [Cc][Ll][Ii][Ee][Nn][Tt]|[Ss][Ii][Mm][Pp][Ll][Ee]|"")
+        allow_loopback
+        deny_spoof
+        allow_trusted_nets ${firewall_trusted_nets}
+        allow_trusted_interfaces ${firewall_trusted_interfaces}
+        allow_connections
+        deny_not_routed_nets
+        allow_icmp_types ${firewall_allowed_icmp_types}
+        open_tcp_ports ${firewall_open_tcp_ports}
+        open_udp_ports ${firewall_open_udp_ports}
+        deny_rest
+    ;;
+
+    [Cc][Ll][Oo][Ss][Ee][Dd])
+        setup_loopback
+        deny_rest
+    ;;
+
+    [Uu][Nn][Kk][Nn][Oo][Ww][Nn])
+    ;;
+
+    *)
+        if [ -r "${firewall_type}" ]; then
+            ${fwcmd} ${firewall_flags} ${firewall_type}
+        fi
+    ;;
 esac
Index: etc/defaults/rc.conf
===================================================================
RCS file: /home/dcvs/src/etc/defaults/rc.conf,v
retrieving revision 1.15
diff -u -p -r1.15 rc.conf
--- etc/defaults/rc.conf	6 Oct 2004 17:03:49 -0000	1.15
+++ etc/defaults/rc.conf	9 Oct 2004 06:31:58 -0000
@@ -59,6 +59,11 @@ dhclient_flags=""		# Additional flags to
 firewall_enable="NO"		# Set to YES to enable firewall functionality
 firewall_script="/etc/rc.firewall" # Which script to run to set up the firewall
 firewall_type="UNKNOWN"		# Firewall type (see /etc/rc.firewall)
+firewall_trusted_nets="192.168.0.0/16" # list of trusted nets
+firewall_trusted_interfaces=""  # list of trusted interfaces e.g. "rl0 xl0"
+firewall_allowed_icmp_types=""  # list of icmp types not blocked
+firewall_open_tcp_ports="22 25 53 80 443" # open ports for our TCP daemons
+firewall_open_udp_ports="53"    # open UDP ports for our daemons
 firewall_quiet="NO"		# Set to YES to suppress rule display
 firewall_logging="NO"		# Set to YES to enable events logging
 firewall_flags=""		# Flags passed to ipfw when type is a file



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