246be37b9cde98b554210201902e65ec84abc624
[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 $GREEN_DEV -m conntrack --ctstate NEW -j ACCEPT ! -p icmp
159
160 # allow DHCP on BLUE to be turned on/off
161 iptables -N DHCPBLUEINPUT
162 iptables -A INPUT -j DHCPBLUEINPUT
163
164 # WIRELESS chains
165 iptables -N WIRELESSINPUT
166 iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
167 iptables -N WIRELESSFORWARD
168 iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
169
170 # OpenVPN
171 iptables -N OVPNINPUT
172 iptables -A INPUT -j OVPNINPUT
173
174 # TOR
175 iptables -N TOR_INPUT
176 iptables -A INPUT -j TOR_INPUT
177
178 # Jump into the actual firewall ruleset.
179 iptables -N INPUTFW
180 iptables -A INPUT -j INPUTFW
181
182 iptables -N OUTGOINGFW
183 iptables -A OUTPUT -j OUTGOINGFW
184
185 iptables -N FORWARDFW
186 iptables -A FORWARD -j FORWARDFW
187
188 # SNAT rules
189 iptables -t nat -N NAT_SOURCE
190 iptables -t nat -A POSTROUTING -j NAT_SOURCE
191
192 # Custom prerouting chains (for transparent proxy)
193 iptables -t nat -N SQUID
194 iptables -t nat -A PREROUTING -j SQUID
195
196 # DNAT rules
197 iptables -t nat -N NAT_DESTINATION
198 iptables -t nat -A PREROUTING -j NAT_DESTINATION
199
200 iptables -t mangle -N NAT_DESTINATION
201 iptables -t mangle -A PREROUTING -j NAT_DESTINATION
202
203 iptables -t nat -N NAT_DESTINATION_FIX
204 iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
205
206 iptables -t nat -A NAT_DESTINATION_FIX \
207 -m mark --mark 1 -j SNAT --to-source "${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
219 # upnp chain for our upnp daemon
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
224
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
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
247 # Apply OpenVPN firewall rules
248 /usr/local/bin/openvpnctrl --firewall-rules
249
250 # run wirelessctrl
251 /usr/local/bin/wirelessctrl
252
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
260
261 # Initialize firewall policies.
262 /usr/sbin/firewall-policy
263
264 # Install firewall rules for the red interface.
265 iptables_red
266 }
267
268 iptables_red() {
269 iptables -F REDINPUT
270 iptables -F REDFORWARD
271 iptables -t nat -F REDNAT
272
273 # PPPoE / PPTP Device
274 if [ "$IFACE" != "" ]; then
275 # PPPoE / PPTP
276 if [ "$DEVICE" != "" ]; then
277 iptables -A REDINPUT -i $DEVICE -j ACCEPT
278 fi
279 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
280 if [ "$RED_DEV" != "" ]; then
281 iptables -A REDINPUT -i $RED_DEV -j ACCEPT
282 fi
283 fi
284 fi
285
286 # PPTP over DHCP
287 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
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 $DEVICE -j ACCEPT
290 fi
291
292 # Orange pinholes
293 if [ "$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
297 iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
298 fi
299 fi
300
301 if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
302 # DHCP
303 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
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 $IFACE -j ACCEPT
306 fi
307 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
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
310 fi
311
312 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
313 iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
314
315 if [ "$IFACE" != "$GREEN_DEV" ]; then
316 iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
317 fi
318
319 fi
320
321 # Reload all rules.
322 /usr/local/bin/firewallctrl
323 }
324
325 # See how we were called.
326 case "$1" in
327 start)
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
346 boot_mesg "Setting up firewall"
347 iptables_init
348 evaluate_retval
349
350 # run local firewall configuration, if present
351 if [ -x /etc/sysconfig/firewall.local ]; then
352 /etc/sysconfig/firewall.local start
353 fi
354 ;;
355 reload)
356 boot_mesg "Reloading firewall"
357 iptables_red
358 evaluate_retval
359
360 # run local firewall configuration, if present
361 if [ -x /etc/sysconfig/firewall.local ]; then
362 /etc/sysconfig/firewall.local reload
363 fi
364 ;;
365 restart)
366 # run local firewall configuration, if present
367 if [ -x /etc/sysconfig/firewall.local ]; then
368 /etc/sysconfig/firewall.local stop
369 fi
370 $0 start
371 ;;
372 *)
373 echo "Usage: $0 {start|reload|restart}"
374 exit 1
375 ;;
376 esac
377
378 exit 0