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