]>
git.ipfire.org Git - people/mfischer/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
144 iptables
-A INPUT
-j P2PBLOCK
145 iptables
-A FORWARD
-j P2PBLOCK
146 iptables
-A OUTPUT
-j P2PBLOCK
148 # IPS (Guardian) chains
150 iptables
-A INPUT
-j GUARDIAN
151 iptables
-A FORWARD
-j GUARDIAN
153 # Block non-established IPsec networks
154 iptables
-N IPSECBLOCK
155 iptables
-A FORWARD
-m policy
--dir out
--pol none
-j IPSECBLOCK
156 iptables
-A OUTPUT
-m policy
--dir out
--pol none
-j IPSECBLOCK
158 # Block OpenVPN transfer networks
159 iptables
-N OVPNBLOCK
160 iptables
-A INPUT
-i tun
+ -j OVPNBLOCK
161 iptables
-A FORWARD
-i tun
+ -j OVPNBLOCK
162 iptables
-A FORWARD
-o tun
+ -j OVPNBLOCK
164 # IPS (Suricata) chains
165 iptables
-N IPS_INPUT
166 iptables
-N IPS_FORWARD
167 iptables
-N IPS_OUTPUT
169 for chain
in INPUT FORWARD OUTPUT
; do
170 iptables
-A "${chain}" -m mark
--mark "0x0/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j "IPS_${chain}"
173 # OpenVPN transfer network translation
174 iptables
-t nat
-N OVPNNAT
175 iptables
-t nat
-A POSTROUTING
-j OVPNNAT
177 # IPTV chains for IGMPPROXY
178 iptables
-N IPTVINPUT
179 iptables
-A INPUT
-j IPTVINPUT
180 iptables
-N IPTVFORWARD
181 iptables
-A FORWARD
-j IPTVFORWARD
183 # Allow to ping the firewall.
184 iptables
-N ICMPINPUT
185 iptables
-A INPUT
-j ICMPINPUT
186 iptables
-A ICMPINPUT
-p icmp
--icmp-type 8 -j ACCEPT
188 # Accept everything on loopback if source/destination is loopback space...
190 iptables
-A LOOPBACK
-i lo
-s 127.0.0.0/8 -j ACCEPT
191 iptables
-A LOOPBACK
-o lo
-d 127.0.0.0/8 -j ACCEPT
193 # ... and drop everything else on the loopback interface, since no other traffic should appear there
194 iptables
-A LOOPBACK
-i lo
-j SPOOFED_MARTIAN
195 iptables
-A LOOPBACK
-o lo
-j SPOOFED_MARTIAN
197 # Filter all packets with loopback addresses on non-loopback interfaces (spoofed)
198 iptables
-A LOOPBACK
-s 127.0.0.0/8 -j SPOOFED_MARTIAN
199 iptables
-A LOOPBACK
-d 127.0.0.0/8 -j SPOOFED_MARTIAN
201 for i
in INPUT FORWARD OUTPUT
; do
202 iptables
-A ${i} -j LOOPBACK
206 iptables
-N CAPTIVE_PORTAL
207 iptables
-N CAPTIVE_PORTAL_CLIENTS
208 for i
in INPUT FORWARD
; do
209 iptables
-A ${i} -j CAPTIVE_PORTAL
212 # Accept everything connected
213 for i
in INPUT FORWARD OUTPUT
; do
214 iptables
-A ${i} -j CONNTRACK
218 iptables
-N DHCPINPUT
219 iptables
-A DHCPINPUT
-p udp
--sport 68 --dport 67 -j ACCEPT
220 iptables
-A DHCPINPUT
-p tcp
--sport 68 --dport 67 -j ACCEPT
222 iptables
-N DHCPOUTPUT
223 iptables
-A DHCPOUTPUT
-p udp
--sport 67 --dport 68 -j ACCEPT
224 iptables
-A DHCPOUTPUT
-p tcp
--sport 67 --dport 68 -j ACCEPT
226 # Allow DHCP on GREEN
227 iptables
-N DHCPGREENINPUT
228 iptables
-N DHCPGREENOUTPUT
229 if [ -n "${GREEN_DEV}" ]; then
230 iptables
-A INPUT
-i "${GREEN_DEV}" -j DHCPGREENINPUT
231 iptables
-A OUTPUT
-o "${GREEN_DEV}" -j DHCPGREENOUTPUT
234 # Allow DHCP on BLUE to be turned on/off
235 iptables
-N DHCPBLUEINPUT
236 iptables
-N DHCPBLUEOUTPUT
237 if [ -n "${BLUE_DEV}" ]; then
238 iptables
-A INPUT
-i "${BLUE_DEV}" -j DHCPBLUEINPUT
239 iptables
-A OUTPUT
-o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
243 iptables
-N TOR_INPUT
244 iptables
-A INPUT
-j TOR_INPUT
247 iptables
-N LOCATIONBLOCK
248 iptables
-A INPUT
-j LOCATIONBLOCK
249 iptables
-A FORWARD
-j LOCATIONBLOCK
251 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
252 iptables
-N IPSECINPUT
253 iptables
-N IPSECFORWARD
254 iptables
-N IPSECOUTPUT
255 iptables
-A INPUT
-j IPSECINPUT
256 iptables
-A FORWARD
-j IPSECFORWARD
257 iptables
-A OUTPUT
-j IPSECOUTPUT
258 iptables
-t nat
-N IPSECNAT
259 iptables
-t nat
-A POSTROUTING
-j IPSECNAT
261 # localhost and ethernet.
262 # Always allow accessing the web GUI from GREEN.
264 iptables
-A INPUT
-j GUIINPUT
265 if [ -n "${GREEN_DEV}" ]; then
266 iptables
-A GUIINPUT
-i "${GREEN_DEV}" -p tcp
--dport 444 -j ACCEPT
270 iptables
-N WIRELESSINPUT
271 iptables
-A INPUT
-m conntrack
--ctstate NEW
-j WIRELESSINPUT
272 iptables
-N WIRELESSFORWARD
273 iptables
-A FORWARD
-m conntrack
--ctstate NEW
-j WIRELESSFORWARD
276 iptables
-N OVPNINPUT
277 iptables
-A INPUT
-j OVPNINPUT
280 iptables
-N TOR_OUTPUT
281 iptables
-A OUTPUT
-j TOR_OUTPUT
283 # Jump into the actual firewall ruleset.
285 iptables
-A INPUT
-j INPUTFW
287 iptables
-N OUTGOINGFW
288 iptables
-A OUTPUT
-j OUTGOINGFW
290 iptables
-N FORWARDFW
291 iptables
-A FORWARD
-j FORWARDFW
294 iptables
-t nat
-N NAT_SOURCE
295 iptables
-t nat
-A POSTROUTING
-j NAT_SOURCE
298 iptables
-t nat
-N CAPTIVE_PORTAL
299 iptables
-t nat
-A PREROUTING
-j CAPTIVE_PORTAL
301 # Custom prerouting chains (for transparent proxy)
302 iptables
-t nat
-N SQUID
303 iptables
-t nat
-A PREROUTING
-j SQUID
306 iptables
-t nat
-N NAT_DESTINATION
307 iptables
-t nat
-A PREROUTING
-j NAT_DESTINATION
308 iptables
-t nat
-A OUTPUT
-j NAT_DESTINATION
310 iptables
-t mangle
-N NAT_DESTINATION
311 iptables
-t mangle
-A PREROUTING
-j NAT_DESTINATION
313 iptables
-t nat
-N NAT_DESTINATION_FIX
314 iptables
-t nat
-A POSTROUTING
-j NAT_DESTINATION_FIX
316 if [ -n "${GREEN_ADDRESS}" ]; then
317 iptables
-t nat
-A NAT_DESTINATION_FIX \
318 -m mark
--mark "0x01000000/${NAT_MASK}" -j SNAT
--to-source "${GREEN_ADDRESS}"
321 if [ -n "${BLUE_ADDRESS}" ]; then
322 iptables
-t nat
-A NAT_DESTINATION_FIX \
323 -m mark
--mark "0x02000000/${NAT_MASK}" -j SNAT
--to-source "${BLUE_ADDRESS}"
326 if [ -n "${ORANGE_ADDRESS}" ]; then
327 iptables
-t nat
-A NAT_DESTINATION_FIX \
328 -m mark
--mark "0x04000000/${NAT_MASK}" -j SNAT
--to-source "${ORANGE_ADDRESS}"
331 # RED chain, used for the red interface
333 iptables
-A INPUT
-j REDINPUT
334 iptables
-N REDFORWARD
335 iptables
-A FORWARD
-j REDFORWARD
336 iptables
-t nat
-N REDNAT
337 iptables
-t nat
-A POSTROUTING
-j REDNAT
339 # Populate IPsec chains
340 /usr
/lib
/firewall
/ipsec-policy
342 # Apply OpenVPN firewall rules
343 /usr
/local
/bin
/openvpnctrl
--firewall-rules
346 /usr
/local
/bin
/wirelessctrl
349 /usr
/local
/bin
/captivectrl
353 iptables
-A INPUT
-j POLICYIN
354 iptables
-N POLICYFWD
355 iptables
-A FORWARD
-j POLICYFWD
356 iptables
-N POLICYOUT
357 iptables
-A OUTPUT
-j POLICYOUT
359 # Initialize firewall policies.
360 /usr
/sbin
/firewall-policy
362 # Install firewall rules for the red interface.
365 # If red has not been brought up yet, we will
366 # add the blocking rules for MASQUERADE
367 if [ ! -e "/var/ipfire/red/active" ]; then
374 iptables
-F REDFORWARD
375 iptables
-t nat
-F REDNAT
377 # Prohibit spoofing our own IP address on RED
378 if [ -f /var
/ipfire
/red
/active
]; then
379 REDIP
="$( cat /var/ipfire/red/local-ipaddress )";
381 if [ "$IFACE" != "" ]; then
382 iptables
-A REDINPUT
-s $REDIP -i $IFACE -j SPOOFED_MARTIAN
383 elif [ "$DEVICE" != "" ]; then
384 iptables
-A REDINPUT
-s $REDIP -i $DEVICE -j SPOOFED_MARTIAN
388 # PPPoE / PPTP Device
389 if [ "$IFACE" != "" ]; then
391 if [ "$DEVICE" != "" ]; then
392 iptables
-A REDINPUT
-i $DEVICE -j ACCEPT
394 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
395 if [ "$RED_DEV" != "" ]; then
396 iptables
-A REDINPUT
-i $RED_DEV -j ACCEPT
402 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
403 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
404 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
407 if [ "$IFACE" != "" -a -f /var
/ipfire
/red
/active
]; then
409 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
410 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
411 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
413 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
414 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
415 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
418 # Outgoing masquerading (don't masqerade IPsec)
419 iptables
-t nat
-A REDNAT
-m policy
--pol ipsec
--dir=out
-o "${IFACE}" -j RETURN
421 if [ "${IFACE}" = "${GREEN_DEV}" ]; then
422 iptables
-t nat
-A REDNAT
-i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
425 local NO_MASQ_NETWORKS
427 if [ "${MASQUERADE_GREEN}" = "off" ]; then
428 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
431 if [ "${MASQUERADE_BLUE}" = "off" ]; then
432 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
435 if [ "${MASQUERADE_ORANGE}" = "off" ]; then
436 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
440 for network
in ${NO_MASQ_NETWORKS}; do
441 iptables
-t nat
-A REDNAT
-s "${network}" -o "${IFACE}" -j RETURN
444 # Masquerade everything else
445 iptables
-t nat
-A REDNAT
-o $IFACE -j MASQUERADE
449 /usr
/local
/bin
/firewallctrl
452 iptables_red_down
() {
453 # Prohibit packets to reach the masquerading rule
454 # while the WAN interface is down - this is required to
455 # circumvent udp related NAT issues
456 # http://forum.ipfire.org/index.php?topic=11127.0
457 if [ -n "${IFACE}" ]; then
458 iptables
-F REDFORWARD
459 iptables
-A REDFORWARD
-o "${IFACE}" -j DROP
463 /usr
/local
/bin
/firewallctrl
466 # See how we were called.
469 boot_mesg
"Setting up firewall"
474 boot_mesg
"Reloading firewall"
479 boot_mesg
"Disabling firewall access to RED"
487 echo "Usage: $0 {start|reload|restart}"