]>
git.ipfire.org Git - people/pmueller/ipfire-2.x.git/blob - src/initscripts/system/firewall
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'`
17 IPS_REPEAT_MARK
="0x80000000"
18 IPS_REPEAT_MASK
="0x80000000"
19 IPS_BYPASS_MARK
="0x40000000"
20 IPS_BYPASS_MASK
="0x40000000"
23 /sbin
/iptables
--wait "$@"
27 # Flush all rules and delete all custom chains
38 iptables
-P INPUT DROP
39 iptables
-P FORWARD DROP
40 iptables
-P OUTPUT ACCEPT
42 # Enable TRACE logging to syslog
44 sysctl
-q -w net.netfilter.nf_log
.2=nf_log_ipv4
46 # IPS Bypass Chain which stores the BYPASS bit in connection tracking
48 iptables
-A IPSBYPASS
-j CONNMARK
--save-mark --mask "$(( ~IPS_REPEAT_MASK & 0xffffffff ))"
50 # Jump into bypass chain when the BYPASS bit is set
51 for chain
in INPUT FORWARD OUTPUT
; do
52 iptables
-A "${chain}" -m mark \
53 --mark "$(( IPS_REPEAT_MARK | IPS_BYPASS_MARK ))/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j IPSBYPASS
56 # Empty LOG_DROP and LOG_REJECT chains
58 iptables
-A LOG_DROP
-m limit
--limit 10/second
-j LOG
59 iptables
-A LOG_DROP
-j DROP
60 iptables
-N LOG_REJECT
61 iptables
-A LOG_REJECT
-m limit
--limit 10/second
-j LOG
62 iptables
-A LOG_REJECT
-j REJECT
64 # This chain will log, then DROPs packets with certain bad combinations
65 # of flags might indicate a port-scan attempt (xmas, null, etc.)
67 if [ "$DROPPORTSCAN" == "on" ]; then
68 iptables
-A PSCAN
-p tcp
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_TCP Scan " -m comment
--comment "DROP_TCP PScan"
69 iptables
-A PSCAN
-p udp
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_UDP Scan " -m comment
--comment "DROP_UDP PScan"
70 iptables
-A PSCAN
-p icmp
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_ICMP Scan " -m comment
--comment "DROP_ICMP PScan"
71 iptables
-A PSCAN
-f -m limit
--limit 10/second
-j LOG
--log-prefix "DROP_FRAG Scan " -m comment
--comment "DROP_FRAG PScan"
73 iptables
-A PSCAN
-j DROP
-m comment
--comment "DROP_PScan"
75 # New tcp packets without SYN set - could well be an obscure type of port scan
76 # that's not covered above, may just be a broken Windows machine
78 if [ "$DROPNEWNOTSYN" == "on" ]; then
79 iptables
-A NEWNOTSYN
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_NEWNOTSYN "
81 iptables
-A NEWNOTSYN
-j DROP
-m comment
--comment "DROP_NEWNOTSYN"
83 # Log and subsequently drop spoofed packets or "martians", arriving from sources
84 # on interfaces where we don't expect them
85 iptables
-N SPOOFED_MARTIAN
86 if [ "$DROPSPOOFEDMARTIAN" == "on" ]; then
87 iptables
-A SPOOFED_MARTIAN
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_SPOOFED_MARTIAN "
89 iptables
-A SPOOFED_MARTIAN
-j DROP
-m comment
--comment "DROP_SPOOFED_MARTIAN"
91 # Chain to contain all the rules relating to bad TCP flags
94 # Don't check loopback
95 iptables
-A BADTCP
-i lo
-j RETURN
97 # Disallow packets frequently used by port-scanners
98 # NMAP FIN/URG/PSH (XMAS scan)
99 iptables
-A BADTCP
-p tcp
--tcp-flags ALL FIN
,URG
,PSH
-j PSCAN
100 # SYN/RST/ACK/FIN/URG
101 iptables
-A BADTCP
-p tcp
--tcp-flags ALL SYN
,RST
,ACK
,FIN
,URG
-j PSCAN
103 iptables
-A BADTCP
-p tcp
--tcp-flags ALL ALL
-j PSCAN
105 iptables
-A BADTCP
-p tcp
--tcp-flags ALL FIN
-j PSCAN
106 # SYN/RST (also catches xmas variants that set SYN+RST+...)
107 iptables
-A BADTCP
-p tcp
--tcp-flags SYN
,RST SYN
,RST
-j PSCAN
108 # SYN/FIN (QueSO or nmap OS probe)
109 iptables
-A BADTCP
-p tcp
--tcp-flags SYN
,FIN SYN
,FIN
-j PSCAN
111 iptables
-A BADTCP
-p tcp
--tcp-flags ALL NONE
-j PSCAN
112 # NEW TCP without SYN
113 iptables
-A BADTCP
-p tcp
! --syn -m conntrack
--ctstate NEW
-j NEWNOTSYN
115 iptables
-A INPUT
-p tcp
-j BADTCP
116 iptables
-A FORWARD
-p tcp
-j BADTCP
118 # Connection tracking chains
119 iptables
-N CONNTRACK
120 iptables
-A CONNTRACK
-m conntrack
--ctstate ESTABLISHED
-j ACCEPT
121 iptables
-A CONNTRACK
-m conntrack
--ctstate INVALID
-j LOG_DROP
122 iptables
-A CONNTRACK
-p icmp
-m conntrack
--ctstate RELATED
-j ACCEPT
124 # Restore any connection marks
125 iptables
-t mangle
-A PREROUTING
-j CONNMARK
--restore-mark
127 # Fix for braindead ISPs
128 iptables
-A FORWARD
-p tcp
--tcp-flags SYN
,RST SYN
-j TCPMSS
--clamp-mss-to-pmtu
130 # CUSTOM chains, can be used by the users themselves
131 iptables
-N CUSTOMINPUT
132 iptables
-A INPUT
-j CUSTOMINPUT
133 iptables
-N CUSTOMFORWARD
134 iptables
-A FORWARD
-j CUSTOMFORWARD
135 iptables
-N CUSTOMOUTPUT
136 iptables
-A OUTPUT
-j CUSTOMOUTPUT
137 iptables
-t nat
-N CUSTOMPREROUTING
138 iptables
-t nat
-A PREROUTING
-j CUSTOMPREROUTING
139 iptables
-t nat
-N CUSTOMPOSTROUTING
140 iptables
-t nat
-A POSTROUTING
-j CUSTOMPOSTROUTING
142 # Log and drop any traffic from and to networks known as being hostile, posing
143 # a technical threat to our users (i. e. listed at Spamhaus DROP et al.)
144 iptables
-N DROP_HOSTILE
145 if [ "$DROPHOSTILE" == "on" ]; then
146 iptables
-A DROP_HOSTILE
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_HOSTILE "
148 iptables
-A INPUT
-i $IFACE -m geoip
--src-cc XD
-j DROP_HOSTILE
149 iptables
-A FORWARD
-i $IFACE -m geoip
--src-cc XD
-j DROP_HOSTILE
150 iptables
-A FORWARD
-o $IFACE -m geoip
--dst-cc XD
-j DROP_HOSTILE
151 iptables
-A OUTPUT
-o $IFACE -m geoip
--src-cc XD
-j DROP_HOSTILE
153 iptables
-A DROP_HOSTILE
-j DROP
-m comment
--comment "DROP_HOSTILE"
158 iptables
-A INPUT
-j P2PBLOCK
159 iptables
-A FORWARD
-j P2PBLOCK
160 iptables
-A OUTPUT
-j P2PBLOCK
162 # IPS (Guardian) chains
164 iptables
-A INPUT
-j GUARDIAN
165 iptables
-A FORWARD
-j GUARDIAN
167 # Block non-established IPsec networks
168 iptables
-N IPSECBLOCK
169 iptables
-A FORWARD
-m policy
--dir out
--pol none
-j IPSECBLOCK
170 iptables
-A OUTPUT
-m policy
--dir out
--pol none
-j IPSECBLOCK
172 # Block OpenVPN transfer networks
173 iptables
-N OVPNBLOCK
174 iptables
-A INPUT
-i tun
+ -j OVPNBLOCK
175 iptables
-A FORWARD
-i tun
+ -j OVPNBLOCK
176 iptables
-A FORWARD
-o tun
+ -j OVPNBLOCK
178 # IPS (Suricata) chains
179 iptables
-N IPS_INPUT
180 iptables
-N IPS_FORWARD
181 iptables
-N IPS_OUTPUT
183 for chain
in INPUT FORWARD OUTPUT
; do
184 iptables
-A "${chain}" -m mark
--mark "0x0/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j "IPS_${chain}"
187 # OpenVPN transfer network translation
188 iptables
-t nat
-N OVPNNAT
189 iptables
-t nat
-A POSTROUTING
-j OVPNNAT
191 # IPTV chains for IGMPPROXY
192 iptables
-N IPTVINPUT
193 iptables
-A INPUT
-j IPTVINPUT
194 iptables
-N IPTVFORWARD
195 iptables
-A FORWARD
-j IPTVFORWARD
197 # Allow to ping the firewall.
198 iptables
-N ICMPINPUT
199 iptables
-A INPUT
-j ICMPINPUT
200 iptables
-A ICMPINPUT
-p icmp
--icmp-type 8 -j ACCEPT
202 # Accept everything on loopback if source/destination is loopback space...
204 iptables
-A LOOPBACK
-i lo
-s 127.0.0.0/8 -j ACCEPT
205 iptables
-A LOOPBACK
-o lo
-d 127.0.0.0/8 -j ACCEPT
207 # ... and drop everything else on the loopback interface, since no other traffic should appear there
208 iptables
-A LOOPBACK
-i lo
-j SPOOFED_MARTIAN
209 iptables
-A LOOPBACK
-o lo
-j SPOOFED_MARTIAN
211 # Filter all packets with loopback addresses on non-loopback interfaces (spoofed)
212 iptables
-A LOOPBACK
-s 127.0.0.0/8 -j SPOOFED_MARTIAN
213 iptables
-A LOOPBACK
-d 127.0.0.0/8 -j SPOOFED_MARTIAN
215 for i
in INPUT FORWARD OUTPUT
; do
216 iptables
-A ${i} -j LOOPBACK
220 iptables
-N CAPTIVE_PORTAL
221 iptables
-N CAPTIVE_PORTAL_CLIENTS
222 for i
in INPUT FORWARD
; do
223 iptables
-A ${i} -j CAPTIVE_PORTAL
226 # Accept everything connected
227 for i
in INPUT FORWARD OUTPUT
; do
228 iptables
-A ${i} -j CONNTRACK
232 iptables
-N DHCPINPUT
233 iptables
-A DHCPINPUT
-p udp
--sport 68 --dport 67 -j ACCEPT
234 iptables
-A DHCPINPUT
-p tcp
--sport 68 --dport 67 -j ACCEPT
236 iptables
-N DHCPOUTPUT
237 iptables
-A DHCPOUTPUT
-p udp
--sport 67 --dport 68 -j ACCEPT
238 iptables
-A DHCPOUTPUT
-p tcp
--sport 67 --dport 68 -j ACCEPT
240 # Allow DHCP on GREEN
241 iptables
-N DHCPGREENINPUT
242 iptables
-N DHCPGREENOUTPUT
243 if [ -n "${GREEN_DEV}" ]; then
244 iptables
-A INPUT
-i "${GREEN_DEV}" -j DHCPGREENINPUT
245 iptables
-A OUTPUT
-o "${GREEN_DEV}" -j DHCPGREENOUTPUT
248 # Allow DHCP on BLUE to be turned on/off
249 iptables
-N DHCPBLUEINPUT
250 iptables
-N DHCPBLUEOUTPUT
251 if [ -n "${BLUE_DEV}" ]; then
252 iptables
-A INPUT
-i "${BLUE_DEV}" -j DHCPBLUEINPUT
253 iptables
-A OUTPUT
-o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
257 iptables
-N TOR_INPUT
258 iptables
-A INPUT
-j TOR_INPUT
261 iptables
-N LOCATIONBLOCK
262 iptables
-A INPUT
-j LOCATIONBLOCK
263 iptables
-A FORWARD
-j LOCATIONBLOCK
265 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
266 iptables
-N IPSECINPUT
267 iptables
-N IPSECFORWARD
268 iptables
-N IPSECOUTPUT
269 iptables
-A INPUT
-j IPSECINPUT
270 iptables
-A FORWARD
-j IPSECFORWARD
271 iptables
-A OUTPUT
-j IPSECOUTPUT
272 iptables
-t nat
-N IPSECNAT
273 iptables
-t nat
-A POSTROUTING
-j IPSECNAT
275 # localhost and ethernet.
276 # Always allow accessing the web GUI from GREEN.
278 iptables
-A INPUT
-j GUIINPUT
279 if [ -n "${GREEN_DEV}" ]; then
280 iptables
-A GUIINPUT
-i "${GREEN_DEV}" -p tcp
--dport 444 -j ACCEPT
284 iptables
-N WIRELESSINPUT
285 iptables
-A INPUT
-m conntrack
--ctstate NEW
-j WIRELESSINPUT
286 iptables
-N WIRELESSFORWARD
287 iptables
-A FORWARD
-m conntrack
--ctstate NEW
-j WIRELESSFORWARD
290 iptables
-N OVPNINPUT
291 iptables
-A INPUT
-j OVPNINPUT
294 iptables
-N TOR_OUTPUT
295 iptables
-A OUTPUT
-j TOR_OUTPUT
297 # Jump into the actual firewall ruleset.
299 iptables
-A INPUT
-j INPUTFW
301 iptables
-N OUTGOINGFW
302 iptables
-A OUTPUT
-j OUTGOINGFW
304 iptables
-N FORWARDFW
305 iptables
-A FORWARD
-j FORWARDFW
308 iptables
-t nat
-N NAT_SOURCE
309 iptables
-t nat
-A POSTROUTING
-j NAT_SOURCE
312 iptables
-t nat
-N CAPTIVE_PORTAL
313 iptables
-t nat
-A PREROUTING
-j CAPTIVE_PORTAL
315 # Custom prerouting chains (for transparent proxy)
316 iptables
-t nat
-N SQUID
317 iptables
-t nat
-A PREROUTING
-j SQUID
320 iptables
-t nat
-N NAT_DESTINATION
321 iptables
-t nat
-A PREROUTING
-j NAT_DESTINATION
322 iptables
-t nat
-A OUTPUT
-j NAT_DESTINATION
324 iptables
-t mangle
-N NAT_DESTINATION
325 iptables
-t mangle
-A PREROUTING
-j NAT_DESTINATION
327 iptables
-t nat
-N NAT_DESTINATION_FIX
328 iptables
-t nat
-A POSTROUTING
-j NAT_DESTINATION_FIX
330 if [ -n "${GREEN_ADDRESS}" ]; then
331 iptables
-t nat
-A NAT_DESTINATION_FIX \
332 -m mark
--mark "0x01000000/${NAT_MASK}" -j SNAT
--to-source "${GREEN_ADDRESS}"
335 if [ -n "${BLUE_ADDRESS}" ]; then
336 iptables
-t nat
-A NAT_DESTINATION_FIX \
337 -m mark
--mark "0x02000000/${NAT_MASK}" -j SNAT
--to-source "${BLUE_ADDRESS}"
340 if [ -n "${ORANGE_ADDRESS}" ]; then
341 iptables
-t nat
-A NAT_DESTINATION_FIX \
342 -m mark
--mark "0x04000000/${NAT_MASK}" -j SNAT
--to-source "${ORANGE_ADDRESS}"
345 # RED chain, used for the red interface
347 iptables
-A INPUT
-j REDINPUT
348 iptables
-N REDFORWARD
349 iptables
-A FORWARD
-j REDFORWARD
350 iptables
-t nat
-N REDNAT
351 iptables
-t nat
-A POSTROUTING
-j REDNAT
353 # Populate IPsec chains
354 /usr
/lib
/firewall
/ipsec-policy
356 # Apply OpenVPN firewall rules
357 /usr
/local
/bin
/openvpnctrl
--firewall-rules
360 /usr
/local
/bin
/wirelessctrl
363 /usr
/local
/bin
/captivectrl
367 iptables
-A INPUT
-j POLICYIN
368 iptables
-N POLICYFWD
369 iptables
-A FORWARD
-j POLICYFWD
370 iptables
-N POLICYOUT
371 iptables
-A OUTPUT
-j POLICYOUT
373 # Initialize firewall policies.
374 /usr
/sbin
/firewall-policy
376 # Install firewall rules for the red interface.
379 # If red has not been brought up yet, we will
380 # add the blocking rules for MASQUERADE
381 if [ ! -e "/var/ipfire/red/active" ]; then
388 iptables
-F REDFORWARD
389 iptables
-t nat
-F REDNAT
391 # Prohibit spoofing our own IP address on RED
392 if [ -f /var
/ipfire
/red
/active
]; then
393 REDIP
="$( cat /var/ipfire/red/local-ipaddress )";
395 if [ "$IFACE" != "" ]; then
396 iptables
-A REDINPUT
-s $REDIP -i $IFACE -j SPOOFED_MARTIAN
397 elif [ "$DEVICE" != "" ]; then
398 iptables
-A REDINPUT
-s $REDIP -i $DEVICE -j SPOOFED_MARTIAN
402 # PPPoE / PPTP Device
403 if [ "$IFACE" != "" ]; then
405 if [ "$DEVICE" != "" ]; then
406 iptables
-A REDINPUT
-i $DEVICE -j ACCEPT
408 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
409 if [ "$RED_DEV" != "" ]; then
410 iptables
-A REDINPUT
-i $RED_DEV -j ACCEPT
416 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
417 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
418 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
421 if [ "$IFACE" != "" -a -f /var
/ipfire
/red
/active
]; then
423 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
424 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
425 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
427 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
428 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
429 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
432 # Outgoing masquerading (don't masqerade IPsec)
433 iptables
-t nat
-A REDNAT
-m policy
--pol ipsec
--dir=out
-o "${IFACE}" -j RETURN
435 if [ "${IFACE}" = "${GREEN_DEV}" ]; then
436 iptables
-t nat
-A REDNAT
-i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
439 local NO_MASQ_NETWORKS
441 if [ "${MASQUERADE_GREEN}" = "off" ]; then
442 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
445 if [ "${MASQUERADE_BLUE}" = "off" ]; then
446 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
449 if [ "${MASQUERADE_ORANGE}" = "off" ]; then
450 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
454 for network
in ${NO_MASQ_NETWORKS}; do
455 iptables
-t nat
-A REDNAT
-s "${network}" -o "${IFACE}" -j RETURN
458 # Masquerade everything else
459 iptables
-t nat
-A REDNAT
-o $IFACE -j MASQUERADE
463 /usr
/local
/bin
/firewallctrl
466 iptables_red_down
() {
467 # Prohibit packets to reach the masquerading rule
468 # while the WAN interface is down - this is required to
469 # circumvent udp related NAT issues
470 # http://forum.ipfire.org/index.php?topic=11127.0
471 if [ -n "${IFACE}" ]; then
472 iptables
-F REDFORWARD
473 iptables
-A REDFORWARD
-o "${IFACE}" -j DROP
477 /usr
/local
/bin
/firewallctrl
480 # See how we were called.
483 boot_mesg
"Setting up firewall"
488 boot_mesg
"Reloading firewall"
493 boot_mesg
"Disabling firewall access to RED"
501 echo "Usage: $0 {start|reload|restart}"