6 eval $
(/usr
/local
/bin
/readhash
/var
/ipfire
/ppp
/settings
)
7 eval $
(/usr
/local
/bin
/readhash
/var
/ipfire
/ethernet
/settings
)
8 eval $
(/usr
/local
/bin
/readhash
/var
/ipfire
/optionsfw
/settings
)
9 IFACE
=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
11 if [ -f /var
/ipfire
/red
/device
]; then
12 DEVICE
=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
16 /sbin
/iptables
--wait "$@"
20 # Flush all rules and delete all custom chains
29 iptables
-P INPUT DROP
30 iptables
-P FORWARD DROP
31 iptables
-P OUTPUT ACCEPT
33 # Empty LOG_DROP and LOG_REJECT chains
35 iptables
-A LOG_DROP
-m limit
--limit 10/minute
-j LOG
36 iptables
-A LOG_DROP
-j DROP
37 iptables
-N LOG_REJECT
38 iptables
-A LOG_REJECT
-m limit
--limit 10/minute
-j LOG
39 iptables
-A LOG_REJECT
-j REJECT
41 # This chain will log, then DROPs packets with certain bad combinations
42 # of flags might indicate a port-scan attempt (xmas, null, etc)
44 if [ "$DROPPORTSCAN" == "on" ]; then
45 iptables
-A PSCAN
-p tcp
-m limit
--limit 10/minute
-j LOG
--log-prefix "DROP_TCP Scan " -m comment
--comment "DROP_TCP PScan"
46 iptables
-A PSCAN
-p udp
-m limit
--limit 10/minute
-j LOG
--log-prefix "DROP_UDP Scan " -m comment
--comment "DROP_UDP PScan"
47 iptables
-A PSCAN
-p icmp
-m limit
--limit 10/minute
-j LOG
--log-prefix "DROP_ICMP Scan " -m comment
--comment "DROP_ICMP PScan"
48 iptables
-A PSCAN
-f -m limit
--limit 10/minute
-j LOG
--log-prefix "DROP_FRAG Scan " -m comment
--comment "DROP_FRAG PScan"
50 iptables
-A PSCAN
-j DROP
-m comment
--comment "DROP_PScan"
52 # New tcp packets without SYN set - could well be an obscure type of port scan
53 # that's not covered above, may just be a broken windows machine
55 if [ "$DROPNEWNOTSYN" == "on" ]; then
56 iptables
-A NEWNOTSYN
-m limit
--limit 10/minute
-j LOG
--log-prefix "DROP_NEWNOTSYN "
58 iptables
-A NEWNOTSYN
-j DROP
-m comment
--comment "DROP_NEWNOTSYN"
60 # Chain to contain all the rules relating to bad TCP flags
63 # Don't check loopback
64 iptables
-A BADTCP
-i lo
-j RETURN
66 # Disallow packets frequently used by port-scanners
68 iptables
-A BADTCP
-p tcp
--tcp-flags ALL FIN
,URG
,PSH
-j PSCAN
70 iptables
-A BADTCP
-p tcp
--tcp-flags ALL NONE
-j PSCAN
72 iptables
-A BADTCP
-p tcp
--tcp-flags ALL FIN
-j PSCAN
73 # SYN/RST (also catches xmas variants that set SYN+RST+...)
74 iptables
-A BADTCP
-p tcp
--tcp-flags SYN
,RST SYN
,RST
-j PSCAN
75 # SYN/FIN (QueSO or nmap OS probe)
76 iptables
-A BADTCP
-p tcp
--tcp-flags SYN
,FIN SYN
,FIN
-j PSCAN
78 iptables
-A BADTCP
-p tcp
! --syn -m conntrack
--ctstate NEW
-j NEWNOTSYN
80 iptables
-A INPUT
-p tcp
-j BADTCP
81 iptables
-A FORWARD
-p tcp
-j BADTCP
83 # Connection tracking chain
85 iptables
-A CONNTRACK
-m conntrack
--ctstate ESTABLISHED
,RELATED
-j ACCEPT
87 # Fix for braindead ISP's
88 iptables
-A FORWARD
-p tcp
--tcp-flags SYN
,RST SYN
-j TCPMSS
--clamp-mss-to-pmtu
90 # CUSTOM chains, can be used by the users themselves
91 iptables
-N CUSTOMINPUT
92 iptables
-A INPUT
-j CUSTOMINPUT
93 iptables
-N CUSTOMFORWARD
94 iptables
-A FORWARD
-j CUSTOMFORWARD
95 iptables
-N CUSTOMOUTPUT
96 iptables
-A OUTPUT
-j CUSTOMOUTPUT
97 iptables
-t nat
-N CUSTOMPREROUTING
98 iptables
-t nat
-A PREROUTING
-j CUSTOMPREROUTING
99 iptables
-t nat
-N CUSTOMPOSTROUTING
100 iptables
-t nat
-A POSTROUTING
-j CUSTOMPOSTROUTING
102 # Guardian (IPS) chains
104 iptables
-A INPUT
-j GUARDIAN
105 iptables
-A FORWARD
-j GUARDIAN
107 # Block OpenVPN transfer networks
108 iptables
-N OVPNBLOCK
109 iptables
-A INPUT
-i tun
+ -j OVPNBLOCK
110 iptables
-A FORWARD
-i tun
+ -j OVPNBLOCK
111 iptables
-A FORWARD
-o tun
+ -j OVPNBLOCK
113 # OpenVPN transfer network translation
114 iptables
-t nat
-N OVPNNAT
115 iptables
-t nat
-A POSTROUTING
-j OVPNNAT
117 # IPTV chains for IGMPPROXY
118 iptables
-N IPTVINPUT
119 iptables
-A INPUT
-j IPTVINPUT
120 iptables
-N IPTVFORWARD
121 iptables
-A FORWARD
-j IPTVFORWARD
123 # Allow to ping the firewall.
124 iptables
-N ICMPINPUT
125 iptables
-A INPUT
-j ICMPINPUT
126 iptables
-A ICMPINPUT
-p icmp
--icmp-type 8 -j ACCEPT
128 # Accept everything on loopback
130 iptables
-A LOOPBACK
-i lo
-j ACCEPT
131 iptables
-A LOOPBACK
-o lo
-j ACCEPT
133 # Filter all packets with loopback addresses on non-loopback interfaces.
134 iptables
-A LOOPBACK
-s 127.0.0.0/8 -j DROP
135 iptables
-A LOOPBACK
-d 127.0.0.0/8 -j DROP
137 for i
in INPUT FORWARD OUTPUT
; do
138 iptables
-A ${i} -j LOOPBACK
141 # Accept everything connected
142 for i
in INPUT FORWARD OUTPUT
; do
143 iptables
-A ${i} -j CONNTRACK
147 iptables
-N DHCPINPUT
148 iptables
-A DHCPINPUT
-p udp
--sport 68 --dport 67 -j ACCEPT
149 iptables
-A DHCPINPUT
-p tcp
--sport 68 --dport 67 -j ACCEPT
151 iptables
-N DHCPOUTPUT
152 iptables
-A DHCPOUTPUT
-p udp
--sport 67 --dport 68 -j ACCEPT
153 iptables
-A DHCPOUTPUT
-p tcp
--sport 67 --dport 68 -j ACCEPT
155 # Allow DHCP on GREEN
156 iptables
-N DHCPGREENINPUT
157 iptables
-N DHCPGREENOUTPUT
158 if [ -n "${GREEN_DEV}" ]; then
159 iptables
-A INPUT
-i "${GREEN_DEV}" -j DHCPGREENINPUT
160 iptables
-A OUTPUT
-o "${GREEN_DEV}" -j DHCPGREENOUTPUT
163 # allow DHCP on BLUE to be turned on/off
164 iptables
-N DHCPBLUEINPUT
165 iptables
-N DHCPBLUEOUTPUT
166 if [ -n "${BLUE_DEV}" ]; then
167 iptables
-A INPUT
-i "${BLUE_DEV}" -j DHCPBLUEINPUT
168 iptables
-A OUTPUT
-o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
171 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
172 iptables
-N IPSECINPUT
173 iptables
-N IPSECFORWARD
174 iptables
-N IPSECOUTPUT
175 iptables
-A INPUT
-j IPSECINPUT
176 iptables
-A FORWARD
-j IPSECFORWARD
177 iptables
-A OUTPUT
-j IPSECOUTPUT
178 iptables
-t nat
-N IPSECNAT
179 iptables
-t nat
-A POSTROUTING
-j IPSECNAT
181 # localhost and ethernet.
182 iptables
-A INPUT
-i $GREEN_DEV -m conntrack
--ctstate NEW
-j ACCEPT
! -p icmp
185 iptables
-N WIRELESSINPUT
186 iptables
-A INPUT
-m conntrack
--ctstate NEW
-j WIRELESSINPUT
187 iptables
-N WIRELESSFORWARD
188 iptables
-A FORWARD
-m conntrack
--ctstate NEW
-j WIRELESSFORWARD
191 iptables
-N OVPNINPUT
192 iptables
-A INPUT
-j OVPNINPUT
195 iptables
-N TOR_INPUT
196 iptables
-A INPUT
-j TOR_INPUT
198 # Jump into the actual firewall ruleset.
200 iptables
-A INPUT
-j INPUTFW
202 iptables
-N OUTGOINGFW
203 iptables
-A OUTPUT
-j OUTGOINGFW
205 iptables
-N FORWARDFW
206 iptables
-A FORWARD
-j FORWARDFW
209 iptables
-t nat
-N NAT_SOURCE
210 iptables
-t nat
-A POSTROUTING
-j NAT_SOURCE
212 # Custom prerouting chains (for transparent proxy)
213 iptables
-t nat
-N SQUID
214 iptables
-t nat
-A PREROUTING
-j SQUID
217 iptables
-t nat
-N NAT_DESTINATION
218 iptables
-t nat
-A PREROUTING
-j NAT_DESTINATION
219 iptables
-t nat
-A OUTPUT
-j NAT_DESTINATION
221 iptables
-t mangle
-N NAT_DESTINATION
222 iptables
-t mangle
-A PREROUTING
-j NAT_DESTINATION
224 iptables
-t nat
-N NAT_DESTINATION_FIX
225 iptables
-t nat
-A POSTROUTING
-j NAT_DESTINATION_FIX
227 iptables
-t nat
-A NAT_DESTINATION_FIX \
228 -m mark
--mark 1 -j SNAT
--to-source "${GREEN_ADDRESS}"
230 if [ -n "${BLUE_ADDRESS}" ]; then
231 iptables
-t nat
-A NAT_DESTINATION_FIX \
232 -m mark
--mark 2 -j SNAT
--to-source "${BLUE_ADDRESS}"
235 if [ -n "${ORANGE_ADDRESS}" ]; then
236 iptables
-t nat
-A NAT_DESTINATION_FIX \
237 -m mark
--mark 3 -j SNAT
--to-source "${ORANGE_ADDRESS}"
240 # upnp chain for our upnp daemon
241 iptables
-t nat
-N UPNPFW
242 iptables
-t nat
-A PREROUTING
-j UPNPFW
244 iptables
-A FORWARD
-m conntrack
--ctstate NEW
-j UPNPFW
246 # RED chain, used for the red interface
248 iptables
-A INPUT
-j REDINPUT
249 iptables
-N REDFORWARD
250 iptables
-A FORWARD
-j REDFORWARD
251 iptables
-t nat
-N REDNAT
252 iptables
-t nat
-A POSTROUTING
-j REDNAT
254 # Filter logging of incoming broadcasts.
255 iptables
-N BROADCAST_FILTER
256 iptables
-A INPUT
-j BROADCAST_FILTER
258 iptables
-A BROADCAST_FILTER
-i "${GREEN_DEV}" -d "${GREEN_BROADCAST}" -j DROP
260 if [ -n "${BLUE_DEV}" -a -n "${BLUE_BROADCAST}" ]; then
261 iptables
-A BROADCAST_FILTER
-i "${BLUE_DEV}" -d "${BLUE_BROADCAST}" -j DROP
264 if [ -n "${ORANGE_DEV}" -a -n "${ORANGE_BROADCAST}" ]; then
265 iptables
-A BROADCAST_FILTER
-i "${ORANGE_DEV}" -d "${ORANGE_BROADCAST}" -j DROP
268 # Apply OpenVPN firewall rules
269 /usr
/local
/bin
/openvpnctrl
--firewall-rules
272 /usr
/local
/bin
/wirelessctrl
276 iptables
-A INPUT
-j POLICYIN
277 iptables
-N POLICYFWD
278 iptables
-A FORWARD
-j POLICYFWD
279 iptables
-N POLICYOUT
280 iptables
-A OUTPUT
-j POLICYOUT
282 # Initialize firewall policies.
283 /usr
/sbin
/firewall-policy
285 # Install firewall rules for the red interface.
291 iptables
-F REDFORWARD
292 iptables
-t nat
-F REDNAT
294 # PPPoE / PPTP Device
295 if [ "$IFACE" != "" ]; then
297 if [ "$DEVICE" != "" ]; then
298 iptables
-A REDINPUT
-i $DEVICE -j ACCEPT
300 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
301 if [ "$RED_DEV" != "" ]; then
302 iptables
-A REDINPUT
-i $RED_DEV -j ACCEPT
308 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
309 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
310 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
314 if [ "$ORANGE_DEV" != "" ]; then
315 # This rule enables a host on ORANGE network to connect to the outside
316 # (only if we have a red connection)
317 if [ "$IFACE" != "" ]; then
318 iptables
-A REDFORWARD
-i $ORANGE_DEV -o $IFACE -j ACCEPT
322 if [ "$IFACE" != "" -a -f /var
/ipfire
/red
/active
]; then
324 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
325 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
326 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
328 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
329 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
330 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
333 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
334 iptables
-t nat
-A REDNAT
-m mark
--mark 50 -o $IFACE -j RETURN
336 if [ "$IFACE" != "$GREEN_DEV" ]; then
337 iptables
-t nat
-A REDNAT
-o $IFACE -j MASQUERADE
343 /usr
/local
/bin
/firewallctrl
346 # See how we were called.
349 boot_mesg
"Loading firewall modules into the kernel"
350 modprobe iptable_nat || failed
=1
351 for i
in $
(find /lib
/modules
/$
(uname
-r) -name nf_conntrack
*); do
352 modprobe $
(basename $i | cut
-d.
-f1) || failed
=1
354 for i
in $
(find /lib
/modules
/$
(uname
-r) -name nf_nat
*); do
355 modprobe $
(basename $i | cut
-d.
-f1) || failed
=1
360 if [ -e /var
/ipfire
/main
/disable_nf_sip
]; then
362 rmmod nf_conntrack_sip
364 rmmod nf_conntrack_h323
367 boot_mesg
"Setting up firewall"
371 # run local firewall configuration, if present
372 if [ -x /etc
/sysconfig
/firewall.
local ]; then
373 /etc
/sysconfig
/firewall.
local start
377 boot_mesg
"Reloading firewall"
381 # run local firewall configuration, if present
382 if [ -x /etc
/sysconfig
/firewall.
local ]; then
383 /etc
/sysconfig
/firewall.
local reload
387 # run local firewall configuration, if present
388 if [ -x /etc
/sysconfig
/firewall.
local ]; then
389 /etc
/sysconfig
/firewall.
local stop
394 echo "Usage: $0 {start|reload|restart}"