]>
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'`
14 if [ -f /var
/ipfire
/red
/device
]; then
15 DEVICE
=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
20 IPS_REPEAT_MARK
="0x80000000"
21 IPS_REPEAT_MASK
="0x80000000"
22 IPS_BYPASS_MARK
="0x40000000"
23 IPS_BYPASS_MASK
="0x40000000"
26 /sbin
/iptables
--wait "$@"
30 # Flush all rules and delete all custom chains
41 iptables
-P INPUT DROP
42 iptables
-P FORWARD DROP
43 iptables
-P OUTPUT ACCEPT
45 # Enable TRACE logging to syslog
47 sysctl
-q -w net.netfilter.nf_log
.2=nf_log_ipv4
49 # IPS Bypass Chain which stores the BYPASS bit in connection tracking
51 iptables
-A IPSBYPASS
-j CONNMARK
--save-mark --mask "$(( ~IPS_REPEAT_MASK & 0xffffffff ))"
53 # Jump into bypass chain when the BYPASS bit is set
54 for chain
in INPUT FORWARD OUTPUT
; do
55 iptables
-A "${chain}" -m mark \
56 --mark "$(( IPS_REPEAT_MARK | IPS_BYPASS_MARK ))/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j IPSBYPASS
59 # Empty LOG_DROP and LOG_REJECT chains
61 iptables
-A LOG_DROP
-m limit
--limit 10/second
-j LOG
62 iptables
-A LOG_DROP
-j DROP
63 iptables
-N LOG_REJECT
64 iptables
-A LOG_REJECT
-m limit
--limit 10/second
-j LOG
65 iptables
-A LOG_REJECT
-j REJECT
67 # This chain will log, then DROPs packets with certain bad combinations
68 # of flags might indicate a port-scan attempt (xmas, null, etc.)
70 if [ "$DROPPORTSCAN" == "on" ]; then
71 iptables
-A PSCAN
-p tcp
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_TCP Scan " -m comment
--comment "DROP_TCP PScan"
72 iptables
-A PSCAN
-p udp
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_UDP Scan " -m comment
--comment "DROP_UDP PScan"
73 iptables
-A PSCAN
-p icmp
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_ICMP Scan " -m comment
--comment "DROP_ICMP PScan"
74 iptables
-A PSCAN
-f -m limit
--limit 10/second
-j LOG
--log-prefix "DROP_FRAG Scan " -m comment
--comment "DROP_FRAG PScan"
76 iptables
-A PSCAN
-j DROP
-m comment
--comment "DROP_PScan"
78 # New tcp packets without SYN set - could well be an obscure type of port scan
79 # that's not covered above, may just be a broken Windows machine
81 if [ "$DROPNEWNOTSYN" == "on" ]; then
82 iptables
-A NEWNOTSYN
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_NEWNOTSYN "
84 iptables
-A NEWNOTSYN
-j DROP
-m comment
--comment "DROP_NEWNOTSYN"
86 # Log and subsequently drop spoofed packets or "martians", arriving from sources
87 # on interfaces where we don't expect them
88 iptables
-N SPOOFED_MARTIAN
89 if [ "$DROPSPOOFEDMARTIAN" == "on" ]; then
90 iptables
-A SPOOFED_MARTIAN
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_SPOOFED_MARTIAN "
92 iptables
-A SPOOFED_MARTIAN
-j DROP
-m comment
--comment "DROP_SPOOFED_MARTIAN"
94 # Chain to contain all the rules relating to bad TCP flags
97 # Don't check loopback
98 iptables
-A BADTCP
-i lo
-j RETURN
100 # Disallow packets frequently used by port-scanners
101 # NMAP FIN/URG/PSH (XMAS scan)
102 iptables
-A BADTCP
-p tcp
--tcp-flags ALL FIN
,URG
,PSH
-j PSCAN
103 # SYN/RST/ACK/FIN/URG
104 iptables
-A BADTCP
-p tcp
--tcp-flags ALL SYN
,RST
,ACK
,FIN
,URG
-j PSCAN
106 iptables
-A BADTCP
-p tcp
--tcp-flags ALL ALL
-j PSCAN
108 iptables
-A BADTCP
-p tcp
--tcp-flags ALL FIN
-j PSCAN
109 # SYN/RST (also catches xmas variants that set SYN+RST+...)
110 iptables
-A BADTCP
-p tcp
--tcp-flags SYN
,RST SYN
,RST
-j PSCAN
111 # SYN/FIN (QueSO or nmap OS probe)
112 iptables
-A BADTCP
-p tcp
--tcp-flags SYN
,FIN SYN
,FIN
-j PSCAN
114 iptables
-A BADTCP
-p tcp
--tcp-flags ALL NONE
-j PSCAN
115 # NEW TCP without SYN
116 iptables
-A BADTCP
-p tcp
! --syn -m conntrack
--ctstate NEW
-j NEWNOTSYN
118 iptables
-A INPUT
-p tcp
-j BADTCP
119 iptables
-A FORWARD
-p tcp
-j BADTCP
121 # Connection tracking chains
122 iptables
-N CONNTRACK
123 iptables
-A CONNTRACK
-m conntrack
--ctstate ESTABLISHED
-j ACCEPT
124 iptables
-A CONNTRACK
-m conntrack
--ctstate INVALID
-j LOG_DROP
125 iptables
-A CONNTRACK
-p icmp
-m conntrack
--ctstate RELATED
-j ACCEPT
127 # Restore any connection marks
128 iptables
-t mangle
-A PREROUTING
-j CONNMARK
--restore-mark
130 # Fix for braindead ISPs
131 iptables
-A FORWARD
-p tcp
--tcp-flags SYN
,RST SYN
-j TCPMSS
--clamp-mss-to-pmtu
133 # CUSTOM chains, can be used by the users themselves
134 iptables
-N CUSTOMINPUT
135 iptables
-A INPUT
-j CUSTOMINPUT
136 iptables
-N CUSTOMFORWARD
137 iptables
-A FORWARD
-j CUSTOMFORWARD
138 iptables
-N CUSTOMOUTPUT
139 iptables
-A OUTPUT
-j CUSTOMOUTPUT
140 iptables
-t nat
-N CUSTOMPREROUTING
141 iptables
-t nat
-A PREROUTING
-j CUSTOMPREROUTING
142 iptables
-t nat
-N CUSTOMPOSTROUTING
143 iptables
-t nat
-A POSTROUTING
-j CUSTOMPOSTROUTING
145 # Log and drop any traffic from and to networks known as being hostile, posing
146 # a technical threat to our users (i. e. listed at Spamhaus DROP et al.)
148 if [ "$DROPHOSTILE" == "on" ]; then
149 iptables
-A HOSTILE
-m limit
--limit 10/second
-j LOG
--log-prefix "DROP_HOSTILE "
150 iptables
-A INPUT
-i $IFACE -m geoip
--src-cc XD
-j HOSTILE
151 iptables
-A FORWARD
-i $IFACE -m geoip
--src-cc XD
-j HOSTILE
152 iptables
-A FORWARD
-o $IFACE -m geoip
--dst-cc XD
-j HOSTILE
153 iptables
-A OUTPUT
-o $IFACE -m geoip
--src-cc XD
-j HOSTILE
155 iptables
-A HOSTILE
-j DROP
-m comment
--comment "DROP_HOSTILE"
159 iptables
-A INPUT
-j P2PBLOCK
160 iptables
-A FORWARD
-j P2PBLOCK
161 iptables
-A OUTPUT
-j P2PBLOCK
163 # IPS (Guardian) chains
165 iptables
-A INPUT
-j GUARDIAN
166 iptables
-A FORWARD
-j GUARDIAN
168 # Block non-established IPsec networks
169 iptables
-N IPSECBLOCK
170 iptables
-A FORWARD
-m policy
--dir out
--pol none
-j IPSECBLOCK
171 iptables
-A OUTPUT
-m policy
--dir out
--pol none
-j IPSECBLOCK
173 # Block OpenVPN transfer networks
174 iptables
-N OVPNBLOCK
175 iptables
-A INPUT
-i tun
+ -j OVPNBLOCK
176 iptables
-A FORWARD
-i tun
+ -j OVPNBLOCK
177 iptables
-A FORWARD
-o tun
+ -j OVPNBLOCK
179 # IPS (Suricata) chains
180 iptables
-N IPS_INPUT
181 iptables
-N IPS_FORWARD
182 iptables
-N IPS_OUTPUT
184 for chain
in INPUT FORWARD OUTPUT
; do
185 iptables
-A "${chain}" -m mark
--mark "0x0/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j "IPS_${chain}"
188 # OpenVPN transfer network translation
189 iptables
-t nat
-N OVPNNAT
190 iptables
-t nat
-A POSTROUTING
-j OVPNNAT
192 # IPTV chains for IGMPPROXY
193 iptables
-N IPTVINPUT
194 iptables
-A INPUT
-j IPTVINPUT
195 iptables
-N IPTVFORWARD
196 iptables
-A FORWARD
-j IPTVFORWARD
198 # Allow to ping the firewall.
199 iptables
-N ICMPINPUT
200 iptables
-A INPUT
-j ICMPINPUT
201 iptables
-A ICMPINPUT
-p icmp
--icmp-type 8 -j ACCEPT
203 # Accept everything on loopback if source/destination is loopback space...
205 iptables
-A LOOPBACK
-i lo
-s 127.0.0.0/8 -j ACCEPT
206 iptables
-A LOOPBACK
-o lo
-d 127.0.0.0/8 -j ACCEPT
208 # ... and drop everything else on the loopback interface, since no other traffic should appear there
209 iptables
-A LOOPBACK
-i lo
-j SPOOFED_MARTIAN
210 iptables
-A LOOPBACK
-o lo
-j SPOOFED_MARTIAN
212 # Filter all packets with loopback addresses on non-loopback interfaces (spoofed)
213 iptables
-A LOOPBACK
-s 127.0.0.0/8 -j SPOOFED_MARTIAN
214 iptables
-A LOOPBACK
-d 127.0.0.0/8 -j SPOOFED_MARTIAN
216 for i
in INPUT FORWARD OUTPUT
; do
217 iptables
-A ${i} -j LOOPBACK
221 iptables
-N CAPTIVE_PORTAL
222 iptables
-N CAPTIVE_PORTAL_CLIENTS
223 for i
in INPUT FORWARD
; do
224 iptables
-A ${i} -j CAPTIVE_PORTAL
227 # Accept everything connected
228 for i
in INPUT FORWARD OUTPUT
; do
229 iptables
-A ${i} -j CONNTRACK
233 iptables
-N DHCPINPUT
234 iptables
-A DHCPINPUT
-p udp
--sport 68 --dport 67 -j ACCEPT
235 iptables
-A DHCPINPUT
-p tcp
--sport 68 --dport 67 -j ACCEPT
237 iptables
-N DHCPOUTPUT
238 iptables
-A DHCPOUTPUT
-p udp
--sport 67 --dport 68 -j ACCEPT
239 iptables
-A DHCPOUTPUT
-p tcp
--sport 67 --dport 68 -j ACCEPT
241 # Allow DHCP on GREEN
242 iptables
-N DHCPGREENINPUT
243 iptables
-N DHCPGREENOUTPUT
244 if [ -n "${GREEN_DEV}" ]; then
245 iptables
-A INPUT
-i "${GREEN_DEV}" -j DHCPGREENINPUT
246 iptables
-A OUTPUT
-o "${GREEN_DEV}" -j DHCPGREENOUTPUT
249 # Allow DHCP on BLUE to be turned on/off
250 iptables
-N DHCPBLUEINPUT
251 iptables
-N DHCPBLUEOUTPUT
252 if [ -n "${BLUE_DEV}" ]; then
253 iptables
-A INPUT
-i "${BLUE_DEV}" -j DHCPBLUEINPUT
254 iptables
-A OUTPUT
-o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
258 iptables
-N TOR_INPUT
259 iptables
-A INPUT
-j TOR_INPUT
262 iptables
-N LOCATIONBLOCK
263 iptables
-A INPUT
-j LOCATIONBLOCK
264 iptables
-A FORWARD
-j LOCATIONBLOCK
266 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
267 iptables
-N IPSECINPUT
268 iptables
-N IPSECFORWARD
269 iptables
-N IPSECOUTPUT
270 iptables
-A INPUT
-j IPSECINPUT
271 iptables
-A FORWARD
-j IPSECFORWARD
272 iptables
-A OUTPUT
-j IPSECOUTPUT
273 iptables
-t nat
-N IPSECNAT
274 iptables
-t nat
-A POSTROUTING
-j IPSECNAT
276 # localhost and ethernet.
277 # Always allow accessing the web GUI from GREEN.
279 iptables
-A INPUT
-j GUIINPUT
280 if [ -n "${GREEN_DEV}" ]; then
281 iptables
-A GUIINPUT
-i "${GREEN_DEV}" -p tcp
--dport 444 -j ACCEPT
285 iptables
-N WIRELESSINPUT
286 iptables
-A INPUT
-m conntrack
--ctstate NEW
-j WIRELESSINPUT
287 iptables
-N WIRELESSFORWARD
288 iptables
-A FORWARD
-m conntrack
--ctstate NEW
-j WIRELESSFORWARD
291 iptables
-N OVPNINPUT
292 iptables
-A INPUT
-j OVPNINPUT
295 iptables
-N TOR_OUTPUT
296 iptables
-A OUTPUT
-j TOR_OUTPUT
298 # Jump into the actual firewall ruleset.
300 iptables
-A INPUT
-j INPUTFW
302 iptables
-N OUTGOINGFW
303 iptables
-A OUTPUT
-j OUTGOINGFW
305 iptables
-N FORWARDFW
306 iptables
-A FORWARD
-j FORWARDFW
309 iptables
-t nat
-N NAT_SOURCE
310 iptables
-t nat
-A POSTROUTING
-j NAT_SOURCE
313 iptables
-t nat
-N CAPTIVE_PORTAL
314 iptables
-t nat
-A PREROUTING
-j CAPTIVE_PORTAL
316 # Custom prerouting chains (for transparent proxy)
317 iptables
-t nat
-N SQUID
318 iptables
-t nat
-A PREROUTING
-j SQUID
321 iptables
-t nat
-N NAT_DESTINATION
322 iptables
-t nat
-A PREROUTING
-j NAT_DESTINATION
323 iptables
-t nat
-A OUTPUT
-j NAT_DESTINATION
325 iptables
-t mangle
-N NAT_DESTINATION
326 iptables
-t mangle
-A PREROUTING
-j NAT_DESTINATION
328 iptables
-t nat
-N NAT_DESTINATION_FIX
329 iptables
-t nat
-A POSTROUTING
-j NAT_DESTINATION_FIX
331 if [ -n "${GREEN_ADDRESS}" ]; then
332 iptables
-t nat
-A NAT_DESTINATION_FIX \
333 -m mark
--mark "0x01000000/${NAT_MASK}" -j SNAT
--to-source "${GREEN_ADDRESS}"
336 if [ -n "${BLUE_ADDRESS}" ]; then
337 iptables
-t nat
-A NAT_DESTINATION_FIX \
338 -m mark
--mark "0x02000000/${NAT_MASK}" -j SNAT
--to-source "${BLUE_ADDRESS}"
341 if [ -n "${ORANGE_ADDRESS}" ]; then
342 iptables
-t nat
-A NAT_DESTINATION_FIX \
343 -m mark
--mark "0x04000000/${NAT_MASK}" -j SNAT
--to-source "${ORANGE_ADDRESS}"
346 # RED chain, used for the red interface
348 iptables
-A INPUT
-j REDINPUT
349 iptables
-N REDFORWARD
350 iptables
-A FORWARD
-j REDFORWARD
351 iptables
-t nat
-N REDNAT
352 iptables
-t nat
-A POSTROUTING
-j REDNAT
354 # Populate IPsec chains
355 /usr
/lib
/firewall
/ipsec-policy
357 # Apply OpenVPN firewall rules
358 /usr
/local
/bin
/openvpnctrl
--firewall-rules
361 /usr
/local
/bin
/wirelessctrl
364 /usr
/local
/bin
/captivectrl
368 iptables
-A INPUT
-j POLICYIN
369 iptables
-N POLICYFWD
370 iptables
-A FORWARD
-j POLICYFWD
371 iptables
-N POLICYOUT
372 iptables
-A OUTPUT
-j POLICYOUT
374 # Initialize firewall policies.
375 /usr
/sbin
/firewall-policy
377 # Install firewall rules for the red interface.
380 # If red has not been brought up yet, we will
381 # add the blocking rules for MASQUERADE
382 if [ ! -e "/var/ipfire/red/active" ]; then
389 iptables
-F REDFORWARD
390 iptables
-t nat
-F REDNAT
392 # Prohibit spoofing our own IP address on RED
393 if [ -f /var
/ipfire
/red
/active
]; then
394 REDIP
="$( cat /var/ipfire/red/local-ipaddress )";
396 if [ "$IFACE" != "" ]; then
397 iptables
-A REDINPUT
-s $REDIP -i $IFACE -j SPOOFED_MARTIAN
398 elif [ "$DEVICE" != "" ]; then
399 iptables
-A REDINPUT
-s $REDIP -i $DEVICE -j SPOOFED_MARTIAN
403 # PPPoE / PPTP Device
404 if [ "$IFACE" != "" ]; then
406 if [ "$DEVICE" != "" ]; then
407 iptables
-A REDINPUT
-i $DEVICE -j ACCEPT
409 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
410 if [ "$RED_DEV" != "" ]; then
411 iptables
-A REDINPUT
-i $RED_DEV -j ACCEPT
417 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
418 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
419 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
422 if [ "$IFACE" != "" -a -f /var
/ipfire
/red
/active
]; then
424 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
425 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
426 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
428 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
429 iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
430 iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
433 # Outgoing masquerading (don't masqerade IPsec)
434 iptables
-t nat
-A REDNAT
-m policy
--pol ipsec
--dir=out
-o "${IFACE}" -j RETURN
436 if [ "${IFACE}" = "${GREEN_DEV}" ]; then
437 iptables
-t nat
-A REDNAT
-i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
440 local NO_MASQ_NETWORKS
442 if [ "${MASQUERADE_GREEN}" = "off" ]; then
443 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
446 if [ "${MASQUERADE_BLUE}" = "off" ]; then
447 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
450 if [ "${MASQUERADE_ORANGE}" = "off" ]; then
451 NO_MASQ_NETWORKS
="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
455 for network
in ${NO_MASQ_NETWORKS}; do
456 iptables
-t nat
-A REDNAT
-s "${network}" -o "${IFACE}" -j RETURN
459 # Masquerade everything else
460 iptables
-t nat
-A REDNAT
-o $IFACE -j MASQUERADE
464 /usr
/local
/bin
/firewallctrl
467 iptables_red_down
() {
468 # Prohibit packets to reach the masquerading rule
469 # while the WAN interface is down - this is required to
470 # circumvent udp related NAT issues
471 # http://forum.ipfire.org/index.php?topic=11127.0
472 if [ -n "${IFACE}" ]; then
473 iptables
-F REDFORWARD
474 iptables
-A REDFORWARD
-o "${IFACE}" -j DROP
478 /usr
/local
/bin
/firewallctrl
481 # See how we were called.
484 boot_mesg
"Setting up firewall"
489 boot_mesg
"Reloading firewall"
494 boot_mesg
"Disabling firewall access to RED"
502 echo "Usage: $0 {start|reload|restart}"