firewall: Fix outgoing OpenVPN N2N tunnel packets.
[people/teissler/ipfire-2.x.git] / src / initscripts / init.d / firewall
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1#!/bin/sh
2
0f5c5ce7
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3. /etc/sysconfig/rc
4. ${rc_functions}
5
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6eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
7eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
fe0cd647 8eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
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9IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
10
11if [ -f /var/ipfire/red/device ]; then
12 DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
13fi
14
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15function iptables() {
16 /sbin/iptables --wait "$@"
17}
18
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19iptables_init() {
20 # Flush all rules and delete all custom chains
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21 iptables -F
22 iptables -t nat -F
23 iptables -t mangle -F
24 iptables -X
25 iptables -t nat -X
26 iptables -t mangle -X
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27
28 # Set up policies
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29 iptables -P INPUT DROP
30 iptables -P FORWARD DROP
31 iptables -P OUTPUT ACCEPT
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32
33 # Empty LOG_DROP and LOG_REJECT chains
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34 iptables -N LOG_DROP
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
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40
41 # This chain will log, then DROPs packets with certain bad combinations
42 # of flags might indicate a port-scan attempt (xmas, null, etc)
c581b670 43 iptables -N PSCAN
5595bc03 44 if [ "$DROPPORTSCAN" == "on" ]; then
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45 iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
46 iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
47 iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
48 iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
5595bc03 49 fi
c581b670 50 iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
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51
52 # New tcp packets without SYN set - could well be an obscure type of port scan
53 # that's not covered above, may just be a broken windows machine
c581b670 54 iptables -N NEWNOTSYN
5595bc03 55 if [ "$DROPNEWNOTSYN" == "on" ]; then
c581b670 56 iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN "
5595bc03 57 fi
c581b670 58 iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
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59
60 # Chain to contain all the rules relating to bad TCP flags
c581b670 61 iptables -N BADTCP
3a1019f6 62
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63 # Don't check loopback
64 iptables -A BADTCP -i lo -j RETURN
d8158ca6 65
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66 # Disallow packets frequently used by port-scanners
67 # nmap xmas
c581b670 68 iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
3a1019f6 69 # Null
c581b670 70 iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
3a1019f6 71 # FIN
c581b670 72 iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
3a1019f6 73 # SYN/RST (also catches xmas variants that set SYN+RST+...)
c581b670 74 iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
3a1019f6 75 # SYN/FIN (QueSO or nmap OS probe)
c581b670 76 iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
3a1019f6 77 # NEW TCP without SYN
c581b670 78 iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
b85d2a98 79
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80 iptables -A INPUT -p tcp -j BADTCP
81 iptables -A FORWARD -p tcp -j BADTCP
c0359d6d 82
b85d2a98 83 # Connection tracking chain
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84 iptables -N CONNTRACK
85 iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
3a1019f6 86
3a1019f6 87 # Fix for braindead ISP's
c581b670 88 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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89
90 # CUSTOM chains, can be used by the users themselves
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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
3a1019f6 101
815eaff4 102 # Guardian (IPS) chains
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103 iptables -N GUARDIAN
104 iptables -A INPUT -j GUARDIAN
105 iptables -A FORWARD -j GUARDIAN
815eaff4 106
1e555330 107 # Block OpenVPN transfer networks
c581b670 108 iptables -N OVPNBLOCK
a0a5c14f 109 iptables -A INPUT -i tun+ -j OVPNBLOCK
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110 iptables -A FORWARD -i tun+ -j OVPNBLOCK
111 iptables -A FORWARD -o tun+ -j OVPNBLOCK
1e555330 112
51ab1de1 113 # OpenVPN transfer network translation
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114 iptables -t nat -N OVPNNAT
115 iptables -t nat -A POSTROUTING -j OVPNNAT
51ab1de1 116
daa1ceba 117 # IPTV chains for IGMPPROXY
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118 iptables -N IPTVINPUT
119 iptables -A INPUT -j IPTVINPUT
120 iptables -N IPTVFORWARD
121 iptables -A FORWARD -j IPTVFORWARD
daa1ceba 122
3a1019f6 123 # filtering from GUI
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124 iptables -N GUIINPUT
125 iptables -A INPUT -j GUIINPUT
126 iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
3a1019f6 127
afc611d4 128 # Accept everything on loopback
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129 iptables -N LOOPBACK
130 iptables -A LOOPBACK -i lo -j ACCEPT
131 iptables -A LOOPBACK -o lo -j ACCEPT
afc611d4 132
3b9a23ce 133 # Filter all packets with loopback addresses on non-loopback interfaces.
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134 iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
135 iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
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136
137 for i in INPUT FORWARD OUTPUT; do
c581b670 138 iptables -A ${i} -j LOOPBACK
3b9a23ce 139 done
afc611d4 140
3a1019f6 141 # Accept everything connected
b85d2a98 142 for i in INPUT FORWARD OUTPUT; do
c581b670 143 iptables -A ${i} -j CONNTRACK
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144 done
145
5fd30232 146 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
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147 iptables -N IPSECINPUT
148 iptables -N IPSECFORWARD
149 iptables -N IPSECOUTPUT
150 iptables -A INPUT -j IPSECINPUT
151 iptables -A FORWARD -j IPSECFORWARD
152 iptables -A OUTPUT -j IPSECOUTPUT
153 iptables -t nat -N IPSECNAT
154 iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14 155
3a1019f6 156 # localhost and ethernet.
c581b670 157 iptables -A INPUT -i $GREEN_DEV -m conntrack --ctstate NEW -j ACCEPT ! -p icmp
218b3341 158
3a1019f6 159 # allow DHCP on BLUE to be turned on/off
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160 iptables -N DHCPBLUEINPUT
161 iptables -A INPUT -j DHCPBLUEINPUT
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162
163 # WIRELESS chains
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164 iptables -N WIRELESSINPUT
165 iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
166 iptables -N WIRELESSFORWARD
167 iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
987b75bc 168
ab4876ad 169 # OpenVPN
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170 iptables -N OVPNINPUT
171 iptables -A INPUT -j OVPNINPUT
ab4876ad 172
987b75bc 173 # TOR
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174 iptables -N TOR_INPUT
175 iptables -A INPUT -j TOR_INPUT
12dcfbbd 176
d5f1422d 177 # Jump into the actual firewall ruleset.
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178 iptables -N INPUTFW
179 iptables -A INPUT -j INPUTFW
d5f1422d 180
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181 iptables -N OUTGOINGFW
182 iptables -A OUTPUT -j OUTGOINGFW
d5f1422d 183
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184 iptables -N FORWARDFW
185 iptables -A FORWARD -j FORWARDFW
d5f1422d 186
fac38614 187 # SNAT rules
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188 iptables -t nat -N NAT_SOURCE
189 iptables -t nat -A POSTROUTING -j NAT_SOURCE
fac38614 190
bb12dd7b 191 # Custom prerouting chains (for transparent proxy)
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192 iptables -t nat -N SQUID
193 iptables -t nat -A PREROUTING -j SQUID
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194
195 # DNAT rules
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196 iptables -t nat -N NAT_DESTINATION
197 iptables -t nat -A PREROUTING -j NAT_DESTINATION
99f11a16 198 iptables -t nat -A OUTPUT -j NAT_DESTINATION
bb12dd7b 199
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200 iptables -t mangle -N NAT_DESTINATION
201 iptables -t mangle -A PREROUTING -j NAT_DESTINATION
202
203 iptables -t nat -N NAT_DESTINATION_FIX
204 iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
205
206 iptables -t nat -A NAT_DESTINATION_FIX \
207 -m mark --mark 1 -j SNAT --to-source "${GREEN_ADDRESS}"
208
209 if [ -n "${BLUE_ADDRESS}" ]; then
210 iptables -t nat -A NAT_DESTINATION_FIX \
211 -m mark --mark 2 -j SNAT --to-source "${BLUE_ADDRESS}"
212 fi
213
214 if [ -n "${ORANGE_ADDRESS}" ]; then
215 iptables -t nat -A NAT_DESTINATION_FIX \
216 -m mark --mark 3 -j SNAT --to-source "${ORANGE_ADDRESS}"
217 fi
218
7e7495b3 219 # upnp chain for our upnp daemon
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220 iptables -t nat -N UPNPFW
221 iptables -t nat -A PREROUTING -j UPNPFW
222 iptables -N UPNPFW
223 iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
3a1019f6 224
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225 # RED chain, used for the red interface
226 iptables -N REDINPUT
227 iptables -A INPUT -j REDINPUT
228 iptables -N REDFORWARD
229 iptables -A FORWARD -j REDFORWARD
230 iptables -t nat -N REDNAT
231 iptables -t nat -A POSTROUTING -j REDNAT
232
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233 # Filter logging of incoming broadcasts.
234 iptables -N BROADCAST_FILTER
235 iptables -A INPUT -j BROADCAST_FILTER
236
237 iptables -A BROADCAST_FILTER -i "${GREEN_DEV}" -d "${GREEN_BROADCAST}" -j DROP
238
239 if [ -n "${BLUE_DEV}" -a -n "${BLUE_BROADCAST}" ]; then
240 iptables -A BROADCAST_FILTER -i "${BLUE_DEV}" -d "${BLUE_BROADCAST}" -j DROP
241 fi
242
243 if [ -n "${ORANGE_DEV}" -a -n "${ORANGE_BROADCAST}" ]; then
244 iptables -A BROADCAST_FILTER -i "${ORANGE_DEV}" -d "${ORANGE_BROADCAST}" -j DROP
245 fi
246
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247 # Apply OpenVPN firewall rules
248 /usr/local/bin/openvpnctrl --firewall-rules
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249
250 # run wirelessctrl
251 /usr/local/bin/wirelessctrl
252
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253 # POLICY CHAIN
254 iptables -N POLICYIN
255 iptables -A INPUT -j POLICYIN
256 iptables -N POLICYFWD
257 iptables -A FORWARD -j POLICYFWD
258 iptables -N POLICYOUT
259 iptables -A OUTPUT -j POLICYOUT
b324de14 260
bb383423 261 # Initialize firewall policies.
5d7faa45 262 /usr/sbin/firewall-policy
690b0bd7 263
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264 # Install firewall rules for the red interface.
265 iptables_red
ff4770c7 266}
3a1019f6 267
ff4770c7 268iptables_red() {
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269 iptables -F REDINPUT
270 iptables -F REDFORWARD
271 iptables -t nat -F REDNAT
3a1019f6 272
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273 # PPPoE / PPTP Device
274 if [ "$IFACE" != "" ]; then
275 # PPPoE / PPTP
276 if [ "$DEVICE" != "" ]; then
c581b670 277 iptables -A REDINPUT -i $DEVICE -j ACCEPT
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278 fi
279 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
280 if [ "$RED_DEV" != "" ]; then
c581b670 281 iptables -A REDINPUT -i $RED_DEV -j ACCEPT
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282 fi
283 fi
3a1019f6 284 fi
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285
286 # PPTP over DHCP
287 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
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288 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
289 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
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290 fi
291
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292 # Orange pinholes
293 if [ "$ORANGE_DEV" != "" ]; then
294 # This rule enables a host on ORANGE network to connect to the outside
295 # (only if we have a red connection)
296 if [ "$IFACE" != "" ]; then
c581b670 297 iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
ff4770c7 298 fi
3a1019f6 299 fi
c400fe4c 300
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301 if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
302 # DHCP
303 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
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304 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
305 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
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306 fi
307 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
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308 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
309 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
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310 fi
311
312 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
c581b670 313 iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
c926c637
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314
315 if [ "$IFACE" != "$GREEN_DEV" ]; then
316 iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
317 fi
c400fe4c 318
6be0579b 319 fi
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320
321 # Reload all rules.
55a5bcae 322 /usr/local/bin/firewallctrl
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323}
324
325# See how we were called.
326case "$1" in
327 start)
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328 boot_mesg "Loading firewall modules into the kernel"
329 modprobe iptable_nat || failed=1
330 for i in $(find /lib/modules/$(uname -r) -name nf_conntrack*); do
331 modprobe $(basename $i | cut -d. -f1) || failed=1
332 done
333 for i in $(find /lib/modules/$(uname -r) -name nf_nat*); do
334 modprobe $(basename $i | cut -d. -f1) || failed=1
335 done
336 (exit ${failed})
337 evaluate_retval
338
339 if [ -e /var/ipfire/main/disable_nf_sip ]; then
340 rmmod nf_nat_sip
341 rmmod nf_conntrack_sip
342 rmmod nf_nat_h323
343 rmmod nf_conntrack_h323
344 fi
345
7d7740a4 346 boot_mesg "Setting up firewall"
ff4770c7 347 iptables_init
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348 evaluate_retval
349
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350 # run local firewall configuration, if present
351 if [ -x /etc/sysconfig/firewall.local ]; then
352 /etc/sysconfig/firewall.local start
353 fi
6be0579b 354 ;;
3a1019f6 355 reload)
7d7740a4 356 boot_mesg "Reloading firewall"
3a1019f6 357 iptables_red
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358 evaluate_retval
359
3a1019f6 360 # run local firewall configuration, if present
ff4770c7 361 if [ -x /etc/sysconfig/firewall.local ]; then
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362 /etc/sysconfig/firewall.local reload
363 fi
364 ;;
365 restart)
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366 # run local firewall configuration, if present
367 if [ -x /etc/sysconfig/firewall.local ]; then
368 /etc/sysconfig/firewall.local stop
369 fi
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370 $0 start
371 ;;
372 *)
ff4770c7 373 echo "Usage: $0 {start|reload|restart}"
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374 exit 1
375 ;;
376esac
377
378exit 0