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
67 # NMAP FIN/URG/PSH (XMAS scan)
68 iptables
-A BADTCP
-p tcp
--tcp-flags ALL FIN
,URG
,PSH
-j PSCAN
70 iptables
-A BADTCP
-p tcp
--tcp-flags ALL SYN
,RST
,ACK
,FIN
,URG
-j PSCAN
72 iptables
-A BADTCP
-p tcp
--tcp-flags ALL ALL
-j PSCAN
74 iptables
-A BADTCP
-p tcp
--tcp-flags ALL FIN
-j PSCAN
75 # SYN/RST (also catches xmas variants that set SYN+RST+...)
76 iptables
-A BADTCP
-p tcp
--tcp-flags SYN
,RST SYN
,RST
-j PSCAN
77 # SYN/FIN (QueSO or nmap OS probe)
78 iptables
-A BADTCP
-p tcp
--tcp-flags SYN
,FIN SYN
,FIN
-j PSCAN
80 iptables
-A BADTCP
-p tcp
--tcp-flags ALL NONE
-j PSCAN
82 iptables
-A BADTCP
-p tcp
! --syn -m conntrack
--ctstate NEW
-j NEWNOTSYN
84 iptables
-A INPUT
-p tcp
-j BADTCP
85 iptables
-A FORWARD
-p tcp
-j BADTCP
87 # Connection tracking chain
89 iptables
-A CONNTRACK
-m conntrack
--ctstate ESTABLISHED
,RELATED
-j ACCEPT
90 iptables
-A CONNTRACK
-m conntrack
--ctstate INVALID
-j DROP
92 # Fix for braindead ISP's
93 iptables
-A FORWARD
-p tcp
--tcp-flags SYN
,RST SYN
-j TCPMSS
--clamp-mss-to-pmtu
95 # CUSTOM chains, can be used by the users themselves
96 iptables
-N CUSTOMINPUT
97 iptables
-A INPUT
-j CUSTOMINPUT
98 iptables
-N CUSTOMFORWARD
99 iptables
-A FORWARD
-j CUSTOMFORWARD
100 iptables
-N CUSTOMOUTPUT
101 iptables
-A OUTPUT
-j CUSTOMOUTPUT
102 iptables
-t nat
-N CUSTOMPREROUTING
103 iptables
-t nat
-A PREROUTING
-j CUSTOMPREROUTING
104 iptables
-t nat
-N CUSTOMPOSTROUTING
105 iptables
-t nat
-A POSTROUTING
-j CUSTOMPOSTROUTING
109 iptables
-A INPUT
-j P2PBLOCK
110 iptables
-A FORWARD
-j P2PBLOCK
111 iptables
-A OUTPUT
-j P2PBLOCK
113 # Guardian (IPS) chains
115 iptables
-A INPUT
-j GUARDIAN
116 iptables
-A FORWARD
-j GUARDIAN
118 # Block non-established IPsec networks
119 iptables
-N IPSECBLOCK
120 iptables
-A FORWARD
-m policy
--dir out
--pol none
-j IPSECBLOCK
121 iptables
-A OUTPUT
-m policy
--dir out
--pol none
-j IPSECBLOCK
123 # Block OpenVPN transfer networks
124 iptables
-N OVPNBLOCK
125 iptables
-A INPUT
-i tun
+ -j OVPNBLOCK
126 iptables
-A FORWARD
-i tun
+ -j OVPNBLOCK
127 iptables
-A FORWARD
-o tun
+ -j OVPNBLOCK
129 # OpenVPN transfer network translation
130 iptables
-t nat
-N OVPNNAT
131 iptables
-t nat
-A POSTROUTING
-j OVPNNAT
133 # IPTV chains for IGMPPROXY
134 iptables
-N IPTVINPUT
135 iptables
-A INPUT
-j IPTVINPUT
136 iptables
-N IPTVFORWARD
137 iptables
-A FORWARD
-j IPTVFORWARD
139 # Allow to ping the firewall.
140 iptables
-N ICMPINPUT
141 iptables
-A INPUT
-j ICMPINPUT
142 iptables
-A ICMPINPUT
-p icmp
--icmp-type 8 -j ACCEPT
144 # Accept everything on loopback
146 iptables
-A LOOPBACK
-i lo
-j ACCEPT
147 iptables
-A LOOPBACK
-o lo
-j ACCEPT
149 # Filter all packets with loopback addresses on non-loopback interfaces.
150 iptables
-A LOOPBACK
-s 127.0.0.0/8 -j DROP
151 iptables
-A LOOPBACK
-d 127.0.0.0/8 -j DROP
153 for i
in INPUT FORWARD OUTPUT
; do
154 iptables
-A ${i} -j LOOPBACK
157 # Accept everything connected
158 for i
in INPUT FORWARD OUTPUT
; do
159 iptables
-A ${i} -j CONNTRACK
163 iptables
-N DHCPINPUT
164 iptables
-A DHCPINPUT
-p udp
--sport 68 --dport 67 -j ACCEPT
165 iptables
-A DHCPINPUT
-p tcp
--sport 68 --dport 67 -j ACCEPT
167 iptables
-N DHCPOUTPUT
168 iptables
-A DHCPOUTPUT
-p udp
--sport 67 --dport 68 -j ACCEPT
169 iptables
-A DHCPOUTPUT
-p tcp
--sport 67 --dport 68 -j ACCEPT
171 # Allow DHCP on GREEN
172 iptables
-N DHCPGREENINPUT
173 iptables
-N DHCPGREENOUTPUT
174 if [ -n "${GREEN_DEV}" ]; then
175 iptables
-A INPUT
-i "${GREEN_DEV}" -j DHCPGREENINPUT
176 iptables
-A OUTPUT
-o "${GREEN_DEV}" -j DHCPGREENOUTPUT
179 # allow DHCP on BLUE to be turned on/off
180 iptables
-N DHCPBLUEINPUT
181 iptables
-N DHCPBLUEOUTPUT
182 if [ -n "${BLUE_DEV}" ]; then
183 iptables
-A INPUT
-i "${BLUE_DEV}" -j DHCPBLUEINPUT
184 iptables
-A OUTPUT
-o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
188 iptables
-N GEOIPBLOCK
189 iptables
-A INPUT
-j GEOIPBLOCK
190 iptables
-A FORWARD
-j GEOIPBLOCK
192 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
193 iptables
-N IPSECINPUT
194 iptables
-N IPSECFORWARD
195 iptables
-N IPSECOUTPUT
196 iptables
-A INPUT
-j IPSECINPUT
197 iptables
-A FORWARD
-j IPSECFORWARD
198 iptables
-A OUTPUT
-j IPSECOUTPUT
199 iptables
-t nat
-N IPSECNAT
200 iptables
-t nat
-A POSTROUTING
-j IPSECNAT
202 # localhost and ethernet.
203 # Always allow accessing the web GUI from GREEN.
205 iptables
-A INPUT
-j GUIINPUT
206 iptables
-A GUIINPUT
-i "${GREEN_DEV}" -p tcp
--dport 444 -j ACCEPT
209 iptables
-N WIRELESSINPUT
210 iptables
-A INPUT
-m conntrack
--ctstate NEW
-j WIRELESSINPUT
211 iptables
-N WIRELESSFORWARD
212 iptables
-A FORWARD
-m conntrack
--ctstate NEW
-j WIRELESSFORWARD
215 iptables
-N OVPNINPUT
216 iptables
-A INPUT
-j OVPNINPUT
219 iptables
-N TOR_INPUT
220 iptables
-A INPUT
-j TOR_INPUT
222 # Jump into the actual firewall ruleset.
224 iptables
-A INPUT
-j INPUTFW
226 iptables
-N OUTGOINGFW
227 iptables
-A OUTPUT
-j OUTGOINGFW
229 iptables
-N FORWARDFW
230 iptables
-A FORWARD
-j FORWARDFW
233 iptables
-t nat
-N NAT_SOURCE
234 iptables
-t nat
-A POSTROUTING
-j NAT_SOURCE
236 # Custom prerouting chains (for transparent proxy)
237 iptables
-t nat
-N SQUID
238 iptables
-t nat
-A PREROUTING
-j SQUID
241 iptables
-t nat
-N NAT_DESTINATION
242 iptables
-t nat
-A PREROUTING
-j NAT_DESTINATION
243 iptables
-t nat
-A OUTPUT
-j NAT_DESTINATION
245 iptables
-t mangle
-N NAT_DESTINATION
246 iptables
-t mangle
-A PREROUTING
-j NAT_DESTINATION
248 iptables
-t nat
-N NAT_DESTINATION_FIX
249 iptables
-t nat
-A POSTROUTING
-j NAT_DESTINATION_FIX
251 iptables
-t nat
-A NAT_DESTINATION_FIX \
252 -m mark
--mark 1 -j SNAT
--to-source "${GREEN_ADDRESS}"
254 if [ -n "${BLUE_ADDRESS}" ]; then
255 iptables
-t nat
-A NAT_DESTINATION_FIX \
256 -m mark
--mark 2 -j SNAT
--to-source "${BLUE_ADDRESS}"
259 if [ -n "${ORANGE_ADDRESS}" ]; then
260 iptables
-t nat
-A NAT_DESTINATION_FIX \
261 -m mark
--mark 3 -j SNAT
--to-source "${ORANGE_ADDRESS}"
264 # upnp chain for our upnp daemon
265 iptables
-t nat
-N UPNPFW
266 iptables
-t nat
-A PREROUTING
-j UPNPFW
268 iptables
-A FORWARD
-m conntrack
--ctstate NEW
-j UPNPFW
270 # RED chain, used for the red interface
272 iptables
-A INPUT
-j REDINPUT
273 iptables
-N REDFORWARD
274 iptables
-A FORWARD
-j REDFORWARD
275 iptables
-t nat
-N REDNAT
276 iptables
-t nat
-A POSTROUTING
-j REDNAT
278 # Populate IPsec block chain
279 /usr
/lib
/firewall
/ipsec-block
281 # Apply OpenVPN firewall rules
282 /usr
/local
/bin
/openvpnctrl
--firewall-rules
285 /usr
/local
/bin
/wirelessctrl
289 iptables
-A INPUT
-j POLICYIN
290 iptables
-N POLICYFWD
291 iptables
-A FORWARD
-j POLICYFWD
292 iptables
-N POLICYOUT
293 iptables
-A OUTPUT
-j POLICYOUT
295 # Initialize firewall policies.
296 /usr
/sbin
/firewall-policy
298 # Install firewall rules for the red interface.
301 # If red has not been brought up yet, we will
302 # add the blocking rules for MASQUERADE
303 if [ ! -e "/var/ipfire/red/active" ]; then
310 iptables
-F REDFORWARD
311 iptables
-t nat
-F REDNAT
313 # PPPoE / PPTP Device
314 if [ "$IFACE" != "" ]; then
316 if [ "$DEVICE" != "" ]; then
317 iptables
-A REDINPUT
-i $DEVICE -j ACCEPT
319 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
320 if [ "$RED_DEV" != "" ]; then
321 iptables
-A REDINPUT
-i $RED_DEV -j ACCEPT
327 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
328 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
329 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
333 if [ "$ORANGE_DEV" != "" ]; then
334 # This rule enables a host on ORANGE network to connect to the outside
335 # (only if we have a red connection)
336 if [ "$IFACE" != "" ]; then
337 iptables
-A REDFORWARD
-i $ORANGE_DEV -o $IFACE -j ACCEPT
341 if [ "$IFACE" != "" -a -f /var
/ipfire
/red
/active
]; then
343 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
344 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
345 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
347 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
348 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
349 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
352 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
353 iptables
-t nat
-A REDNAT
-m mark
--mark 50 -o $IFACE -j RETURN
355 if [ "$IFACE" = "$GREEN_DEV" ]; then
356 MASQUERADE_GREEN
="off"
359 local NO_MASQ_NETWORKS
361 if [ "${MASQUERADE_GREEN}" = "off" ]; then
362 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
365 if [ "${MASQUERADE_BLUE}" = "off" ]; then
366 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
369 if [ "${MASQUERADE_ORANGE}" = "off" ]; then
370 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
374 for network
in ${NO_MASQ_NETWORKS}; do
375 iptables
-t nat
-A REDNAT
-s "${network}" -o "${IFACE}" -j RETURN
378 # Masquerade everything else
379 iptables
-t nat
-A REDNAT
-o $IFACE -j MASQUERADE
383 /usr
/local
/bin
/firewallctrl
386 iptables_red_down
() {
387 # Prohibit packets to reach the masquerading rule
388 # while the wan interface is down - this is required to
389 # circumvent udp related NAT issues
390 # http://forum.ipfire.org/index.php?topic=11127.0
391 if [ -n "${IFACE}" ]; then
392 iptables
-F REDFORWARD
393 iptables
-A REDFORWARD
-o "${IFACE}" -j DROP
397 /usr
/local
/bin
/firewallctrl
400 # See how we were called.
403 boot_mesg
"Loading firewall modules into the kernel"
404 modprobe iptable_nat || failed
=1
405 for i
in $
(find /lib
/modules
/$
(uname
-r) -name nf_conntrack
*); do
406 modprobe $
(basename $i | cut
-d.
-f1) || failed
=1
408 for i
in $
(find /lib
/modules
/$
(uname
-r) -name nf_nat
*); do
409 modprobe $
(basename $i | cut
-d.
-f1) || failed
=1
414 if [ -e /var
/ipfire
/main
/disable_nf_sip
]; then
416 rmmod nf_conntrack_sip
418 rmmod nf_conntrack_h323
421 boot_mesg
"Setting up firewall"
426 boot_mesg
"Reloading firewall"
431 boot_mesg
"Disabling firewall access to RED"
439 echo "Usage: $0 {start|reload|restart}"