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authorRoy Marples <roy@marples.name>2007-11-20 16:53:45 +0000
committerRoy Marples <roy@marples.name>2007-11-20 16:53:45 +0000
commita12da90fb324fa5d88e4cc753ffcf680b70251b3 (patch)
tree72eee85cb796a673e324bf262bfc4611f5ef8519 /init.d.BSD/ipfw
parent739d51c349c3e046e1f895edd5f0784c1789ce21 (diff)
Add an ipfw init script
Diffstat (limited to 'init.d.BSD/ipfw')
-rw-r--r--init.d.BSD/ipfw169
1 files changed, 169 insertions, 0 deletions
diff --git a/init.d.BSD/ipfw b/init.d.BSD/ipfw
new file mode 100644
index 00000000..f5dfa775
--- /dev/null
+++ b/init.d.BSD/ipfw
@@ -0,0 +1,169 @@
+#!/sbin/runscript
+# Copyright 2007 Roy Marples
+# 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.
+#
+# 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.
+
+# This is based on /etc/rc.firewall and /etc/rc.firewall6 from FreeBSD
+
+IP_IN=${IP_IN-any}
+PORTS_IN=${PORTS_IN-auth ssh}
+PORTS_NOLOG=${PORTS_NOLOG-135-139,445 1026,1027 1433,1434}
+
+opts="panic showstatus"
+
+depend() {
+ before net
+ provide firewall
+}
+
+ipfw() {
+ /sbin/ipfw -f -q "$@"
+}
+
+init() {
+ # Load the kernel module
+ if ! sysctl net.inet.ip.fw.enable=1 >/dev/null 2>/dev/null; then
+ if ! kldload ipfw ; then
+ eend 1 "Unable to load firewall module"
+ return 1
+ fi
+ fi
+
+ # Now all rules and give a good base
+ ipfw flush
+
+ ipfw add pass all from any to any via lo0
+ ipfw add deny all from any to 127.0.0.0/8
+ ipfw add deny ip from 127.0.0.0/8 to any
+
+ ipfw add pass ip6 from any to any via lo0
+ ipfw add deny ip6 from any to ::1
+ ipfw add deny ip6 from ::1 to any
+
+ ipfw add pass ip6 from :: to ff02::/16 proto ipv6-icmp
+ ipfw add pass ip6 from fe80::/10 to fe80::/10 proto ipv6-icmp
+ ipfw add pass ip6 from fe80::/10 to ff02::/16 proto ipv6-icmp
+}
+
+start() {
+ local i= p= log=
+ ebegin "Starting firewall rules"
+ if ! init ; then
+ eend 1 "Failed to flush firewall ruleset"
+ return 1
+ fi
+
+ # Use a statefull firewall
+ ipfw add check-state
+ ipfw add pass tcp from me to any established
+
+ # Allow any connection out, adding state for each.
+ ipfw add pass tcp from me to any setup keep-state
+ ipfw add pass udp from me to any keep-state
+ ipfw add pass icmp from me to any keep-state
+
+ ipfw add pass tcp from me6 to any setup keep-state
+ ipfw add pass udp from me6 to any keep-state
+ ipfw add pass icmp from me6 to any keep-state
+
+ # Allow DHCP.
+ ipfw add pass udp from 0.0.0.0 68 to 255.255.255.255 67 out
+ ipfw add pass udp from any 67 to me 68 in
+ ipfw add pass udp from any 67 to 255.255.255.255 68 in
+ # Some servers will ping the IP while trying to decide if it's
+ # still in use.
+ ipfw add pass icmp from any to any icmptype 8
+
+ # Allow "mandatory" ICMP in.
+ ipfw add pass icmp from any to any icmptype 3,4,11
+
+ # Allow ICMPv6 destination unreach
+ ipfw add pass ip6 from any to any icmp6types 1 proto ipv6-icmp
+
+ # Allow NS/NA/toobig (don't filter it out)
+ ipfw add pass ip6 from any to any icmp6types 2,135,136 proto ipv6-icmp
+
+ # Add permits for this workstations published services below
+ # Only IPs and nets in firewall_allowservices is allowed in.
+ for i in ${IP_IN}; do
+ for p in ${PORTS_IN}; do
+ ipfw add pass tcp from ${i} to me ${p}
+ done
+ done
+
+ # Allow all connections from trusted IPs.
+ # Playing with the content of firewall_trusted could seriously
+ # degrade the level of protection provided by the firewall.
+ for i in ${IP_TRUST}; do
+ ipfw add pass ip from ${i} to me
+ done
+
+ ipfw add 65000 count ip from any to any
+
+ # Drop packets to ports where we don't want logging
+ for p in ${PORTS_NOLOG}; do
+ ipfw add deny { tcp or udp } from any to any ${p} in
+ done
+
+ # Broadcasts and muticasts
+ ipfw add deny ip from any to 255.255.255.255
+ ipfw add deny ip from any to 224.0.0.0/24
+
+ # Noise from routers
+ ipfw add deny udp from any to any 520 in
+
+ # Noise from webbrowsing.
+ # The statefull filter is a bit agressive, and will cause some
+ # connection teardowns to be logged.
+ ipfw add deny tcp from any 80,443 to any 1024-65535 in
+
+ # Deny and (if wanted) log the rest unconditionally.
+ if [ "${LOG_DENY}" = "yes" ]; then
+ log="log"
+ sysctl net.inet.ip.fw.verbose=1 >/dev/null
+ fi
+ ipfw add deny ${log} ip from any to any
+
+ eend 0
+}
+
+stop() {
+ ebegin "Stopping firewall rules"
+ # We don't unload the kernel module as that action
+ # can cause memory leaks as of FreeBSD 6.x
+ sysctl net.inet.ip.fw.enable=0 >/dev/null
+ eend $?
+}
+
+panic() {
+ ebegin "Stopping firewall rules - hard"
+ if ! init ; then
+ eend 1 "Failed to flush firewall ruleset"
+ return 1
+ fi
+ eend 0
+}
+
+showstatus() {
+ ipfw show
+}