firewall: don't clear the mangle table at startup or stop - it doesn't use it and...
[openwrt/svn-archive/archive.git] / package / firewall / files / uci_firewall.sh
1 #!/bin/sh
2 # Copyright (C) 2008 John Crispin <blogic@openwrt.org>
3
4 . /etc/functions.sh
5
6 IPTABLES="echo iptables"
7 IPTABLES=iptables
8
9 config_clear
10 include /lib/network
11 scan_interfaces
12
13 CONFIG_APPEND=1
14 config_load firewall
15
16 config fw_zones
17 ZONE_LIST=$CONFIG_SECTION
18
19 CUSTOM_CHAINS=1
20 DEF_INPUT=DROP
21 DEF_OUTPUT=DROP
22 DEF_FORWARD=DROP
23
24 load_policy() {
25 config_get input $1 input
26 config_get output $1 output
27 config_get forward $1 forward
28
29 DEF_INPUT="${input:-$DEF_INPUT}"
30 DEF_OUTPUT="${output:-$DEF_OUTPUT}"
31 DEF_FORWARD="${forward:-$DEF_FORWARD}"
32 }
33
34 create_zone() {
35 local exists
36
37 [ "$1" == "loopback" ] && return
38
39 config_get exists $ZONE_LIST $1
40 [ -n "$exists" ] && return
41 config_set $ZONE_LIST $1 1
42
43 $IPTABLES -N zone_$1
44 $IPTABLES -N zone_$1_MSSFIX
45 $IPTABLES -N zone_$1_ACCEPT
46 $IPTABLES -N zone_$1_DROP
47 $IPTABLES -N zone_$1_REJECT
48 $IPTABLES -N zone_$1_forward
49 $IPTABLES -A zone_$1_forward -j zone_$1_$5
50 $IPTABLES -A zone_$1 -j zone_$1_$3
51 $IPTABLES -A output -j zone_$1_$4
52 $IPTABLES -N zone_$1_nat -t nat
53 $IPTABLES -N zone_$1_prerouting -t nat
54 [ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$1_nat
55 }
56
57 addif() {
58 local network="$1"
59 local ifname="$2"
60 local zone="$3"
61
62 local n_if n_zone
63 config_get n_if core "${network}_ifname"
64 config_get n_zone core "${network}_zone"
65 [ -n "$n_zone" ] && {
66 if [ "$n_zone" != "$zone" ]; then
67 delif "$network" "$n_if" "$n_zone"
68 else
69 return
70 fi
71 }
72
73 logger "adding $network ($ifname) to firewall zone $zone"
74 $IPTABLES -A input -i "$ifname" -j zone_${zone}
75 $IPTABLES -I zone_${zone}_MSSFIX 1 -o "$ifname" -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
76 $IPTABLES -I zone_${zone}_ACCEPT 1 -o "$ifname" -j ACCEPT
77 $IPTABLES -I zone_${zone}_DROP 1 -o "$ifname" -j DROP
78 $IPTABLES -I zone_${zone}_REJECT 1 -o "$ifname" -j reject
79 $IPTABLES -I zone_${zone}_ACCEPT 1 -i "$ifname" -j ACCEPT
80 $IPTABLES -I zone_${zone}_DROP 1 -i "$ifname" -j DROP
81 $IPTABLES -I zone_${zone}_REJECT 1 -i "$ifname" -j reject
82 $IPTABLES -I zone_${zone}_nat 1 -t nat -o "$ifname" -j MASQUERADE
83 $IPTABLES -I PREROUTING 1 -t nat -i "$ifname" -j zone_${zone}_prerouting
84 $IPTABLES -A forward -i "$ifname" -j zone_${zone}_forward
85 uci_set_state firewall core "${network}_ifname" "$ifname"
86 uci_set_state firewall core "${network}_zone" "$zone"
87 }
88
89 delif() {
90 local network="$1"
91 local ifname="$2"
92 local zone="$3"
93
94 logger "removing $network ($ifname) from firewall zone $zone"
95 $IPTABLES -D input -i "$ifname" -j zone_$zone
96 $IPTABLES -D zone_${zone}_MSSFIX -o "$ifname" -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
97 $IPTABLES -D zone_${zone}_ACCEPT -o "$ifname" -j ACCEPT
98 $IPTABLES -D zone_${zone}_DROP -o "$ifname" -j DROP
99 $IPTABLES -D zone_${zone}_REJECT -o "$ifname" -j reject
100 $IPTABLES -D zone_${zone}_ACCEPT -i "$ifname" -j ACCEPT
101 $IPTABLES -D zone_${zone}_DROP -i "$ifname" -j DROP
102 $IPTABLES -D zone_${zone}_REJECT -i "$ifname" -j reject
103 $IPTABLES -D zone_${zone}_nat -t nat -o "$ifname" -j MASQUERADE
104 $IPTABLES -D PREROUTING -t nat -i "$ifname" -j zone_${zone}_prerouting
105 $IPTABLES -D forward -i "$ifname" -j zone_${zone}_forward
106 uci_revert_state firewall core "${network}_ifname"
107 uci_revert_state firewall core "${network}_zone"
108 }
109
110 load_synflood() {
111 local rate=${1:-25}
112 local burst=${2:-50}
113 echo "Loading synflood protection"
114 $IPTABLES -N syn_flood
115 $IPTABLES -A syn_flood -p tcp --syn -m limit --limit $rate/second --limit-burst $burst -j RETURN
116 $IPTABLES -A syn_flood -j DROP
117 $IPTABLES -A INPUT -p tcp --syn -j syn_flood
118 }
119
120 fw_set_chain_policy() {
121 local chain=$1
122 local target=$2
123 [ "$target" == "REJECT" ] && {
124 $IPTABLES -A $chain -j reject
125 target=DROP
126 }
127 $IPTABLES -P $chain $target
128 }
129
130 fw_defaults() {
131 [ -n "$DEFAULTS_APPLIED" ] && {
132 echo "Error: multiple defaults sections detected"
133 return;
134 }
135 DEFAULTS_APPLIED=1
136
137 load_policy "$1"
138
139 echo 1 > /proc/sys/net/ipv4/tcp_syncookies
140 for f in /proc/sys/net/ipv4/conf/*/accept_redirects
141 do
142 echo 0 > $f
143 done
144 for f in /proc/sys/net/ipv4/conf/*/accept_source_route
145 do
146 echo 0 > $f
147 done
148
149 uci_revert_state firewall core
150 uci_set_state firewall core "" firewall_state
151
152 $IPTABLES -P INPUT DROP
153 $IPTABLES -P OUTPUT DROP
154 $IPTABLES -P FORWARD DROP
155
156 $IPTABLES -F
157 $IPTABLES -t nat -F
158 $IPTABLES -t nat -X
159 $IPTABLES -X
160
161 config_get_bool drop_invalid $1 drop_invalid 1
162
163 [ "$drop_invalid" -gt 0 ] && {
164 $IPTABLES -A INPUT -m state --state INVALID -j DROP
165 $IPTABLES -A OUTPUT -m state --state INVALID -j DROP
166 $IPTABLES -A FORWARD -m state --state INVALID -j DROP
167 }
168
169 $IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
170 $IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
171 $IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
172
173 $IPTABLES -A INPUT -i lo -j ACCEPT
174 $IPTABLES -A OUTPUT -o lo -j ACCEPT
175
176 config_get syn_flood $1 syn_flood
177 config_get syn_rate $1 syn_rate
178 config_get syn_burst $1 syn_burst
179 [ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
180
181 echo "Adding custom chains"
182 fw_custom_chains
183
184 $IPTABLES -N input
185 $IPTABLES -N output
186 $IPTABLES -N forward
187
188 $IPTABLES -A INPUT -j input
189 $IPTABLES -A OUTPUT -j output
190 $IPTABLES -A FORWARD -j forward
191
192 $IPTABLES -N reject
193 $IPTABLES -A reject -p tcp -j REJECT --reject-with tcp-reset
194 $IPTABLES -A reject -j REJECT --reject-with icmp-port-unreachable
195
196 fw_set_chain_policy INPUT "$DEF_INPUT"
197 fw_set_chain_policy OUTPUT "$DEF_OUTPUT"
198 fw_set_chain_policy FORWARD "$DEF_FORWARD"
199 }
200
201 fw_zone() {
202 local name
203 local network
204 local masq
205
206 config_get name $1 name
207 config_get network $1 network
208 config_get masq $1 masq
209 load_policy $1
210
211 [ -z "$network" ] && network=$name
212 create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
213 fw_custom_chains_zone "$name"
214 }
215
216 fw_rule() {
217 local src
218 local src_ip
219 local src_mac
220 local src_port
221 local src_mac
222 local dest
223 local dest_ip
224 local dest_port
225 local proto
226 local target
227 local ruleset
228
229 config_get src $1 src
230 config_get src_ip $1 src_ip
231 config_get src_mac $1 src_mac
232 config_get src_port $1 src_port
233 config_get dest $1 dest
234 config_get dest_ip $1 dest_ip
235 config_get dest_port $1 dest_port
236 config_get proto $1 proto
237 config_get target $1 target
238 config_get ruleset $1 ruleset
239
240 src_port_first=${src_port%-*}
241 src_port_last=${src_port#*-}
242 [ "$src_port_first" -ne "$src_port_last" ] && { \
243 src_port="$src_port_first:$src_port_last"; }
244
245 dest_port_first=${dest_port%-*}
246 dest_port_last=${dest_port#*-}
247 [ "$dest_port_first" -ne "$dest_port_last" ] && { \
248 dest_port="$dest_port_first:$dest_port_last"; }
249
250 ZONE=input
251 TARGET=$target
252 [ -z "$target" ] && target=DROP
253 [ -n "$src" -a -z "$dest" ] && ZONE=zone_$src
254 [ -n "$src" -a -n "$dest" ] && ZONE=zone_${src}_forward
255 [ -n "$dest" ] && TARGET=zone_${dest}_$target
256 add_rule() {
257 $IPTABLES -I $ZONE 1 \
258 ${proto:+-p $proto} \
259 ${src_ip:+-s $src_ip} \
260 ${src_port:+--sport $src_port} \
261 ${src_mac:+-m mac --mac-source $src_mac} \
262 ${dest_ip:+-d $dest_ip} \
263 ${dest_port:+--dport $dest_port} \
264 -j $TARGET
265 }
266 [ "$proto" == "tcpudp" -o -z "$proto" ] && {
267 proto=tcp
268 add_rule
269 proto=udp
270 add_rule
271 return
272 }
273 add_rule
274 }
275
276 fw_forwarding() {
277 local src
278 local dest
279 local masq
280
281 config_get src $1 src
282 config_get dest $1 dest
283 config_get_bool mtu_fix $1 mtu_fix 0
284 [ -n "$src" ] && z_src=zone_${src}_forward || z_src=forward
285 [ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
286 $IPTABLES -I $z_src 1 -j $z_dest
287 [ "$mtu_fix" -gt 0 -a -n "$dest" ] && $IPTABLES -I $z_src 1 -j zone_${dest}_MSSFIX
288 }
289
290 fw_redirect() {
291 local src
292 local src_ip
293 local src_port
294 local src_dport
295 local src_mac
296 local dest_ip
297 local dest_port dest_port2
298 local proto
299
300 config_get src $1 src
301 config_get src_ip $1 src_ip
302 config_get src_port $1 src_port
303 config_get src_dport $1 src_dport
304 config_get src_mac $1 src_mac
305 config_get dest_ip $1 dest_ip
306 config_get dest_port $1 dest_port
307 config_get proto $1 proto
308 [ -z "$src" -o -z "$dest_ip" ] && { \
309 echo "redirect needs src and dest_ip"; return ; }
310
311 src_port_first=${src_port%-*}
312 src_port_last=${src_port#*-}
313 [ "$src_port_first" -ne "$src_port_last" ] && { \
314 src_port="$src_port_first:$src_port_last"; }
315
316 src_dport_first=${src_dport%-*}
317 src_dport_last=${src_dport#*-}
318 [ "$src_dport_first" -ne "$src_dport_last" ] && { \
319 src_dport="$src_dport_first:$src_dport_last"; }
320
321 dest_port2=$dest_port
322 dest_port_first=${dest_port2%-*}
323 dest_port_last=${dest_port2#*-}
324 [ "$dest_port_first" -ne "$dest_port_last" ] && { \
325 dest_port2="$dest_port_first:$dest_port_last"; }
326
327 add_rule() {
328 $IPTABLES -A zone_${src}_prerouting -t nat \
329 ${proto:+-p $proto} \
330 ${src_ip:+-s $src_ip} \
331 ${src_port:+--sport $src_port} \
332 ${src_dport:+--dport $src_dport} \
333 ${src_mac:+-m mac --mac-source $src_mac} \
334 -j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
335
336 $IPTABLES -I zone_${src}_forward 1 \
337 ${proto:+-p $proto} \
338 -d $dest_ip \
339 ${src_ip:+-s $src_ip} \
340 ${src_port:+--sport $src_port} \
341 ${dest_port2:+--dport $dest_port2} \
342 ${src_mac:+-m mac --mac-source $src_mac} \
343 -j ACCEPT
344 }
345 [ "$proto" == "tcpudp" -o -z "$proto" ] && {
346 proto=tcp
347 add_rule
348 proto=udp
349 add_rule
350 return
351 }
352 add_rule
353 }
354
355 fw_include() {
356 local path
357 config_get path $1 path
358 [ -e $path ] && . $path
359 }
360
361 fw_addif() {
362 local up
363 local ifname
364 config_get up $1 up
365 config_get ifname $1 ifname
366 [ -n "$up" ] || return 0
367 (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
368 }
369
370 fw_custom_chains() {
371 [ -n "$CUSTOM_CHAINS" ] || return 0
372 $IPTABLES -N input_rule
373 $IPTABLES -N output_rule
374 $IPTABLES -N forwarding_rule
375 $IPTABLES -N prerouting_rule -t nat
376 $IPTABLES -N postrouting_rule -t nat
377
378 $IPTABLES -A INPUT -j input_rule
379 $IPTABLES -A OUTPUT -j output_rule
380 $IPTABLES -A FORWARD -j forwarding_rule
381 $IPTABLES -A PREROUTING -t nat -j prerouting_rule
382 $IPTABLES -A POSTROUTING -t nat -j postrouting_rule
383 }
384
385 fw_custom_chains_zone() {
386 local zone="$1"
387
388 [ -n "$CUSTOM_CHAINS" ] || return 0
389 $IPTABLES -N input_${zone}
390 $IPTABLES -N forwarding_${zone}
391 $IPTABLES -N prerouting_${zone} -t nat
392 $IPTABLES -I zone_${zone} 1 -j input_${zone}
393 $IPTABLES -I zone_${zone}_forward 1 -j forwarding_${zone}
394 $IPTABLES -I zone_${zone}_prerouting 1 -t nat -j prerouting_${zone}
395 }
396
397 fw_init() {
398 DEFAULTS_APPLIED=
399
400 echo "Loading defaults"
401 config_foreach fw_defaults defaults
402 echo "Loading zones"
403 config_foreach fw_zone zone
404 echo "Loading rules"
405 config_foreach fw_rule rule
406 echo "Loading forwarding"
407 config_foreach fw_forwarding forwarding
408 echo "Loading redirects"
409 config_foreach fw_redirect redirect
410 echo "Loading includes"
411 config_foreach fw_include include
412 uci_set_state firewall core loaded 1
413 unset CONFIG_APPEND
414 config_load network
415 config_foreach fw_addif interface
416 }
417
418 fw_stop() {
419 $IPTABLES -F
420 $IPTABLES -t nat -F
421 $IPTABLES -t nat -X
422 $IPTABLES -X
423 $IPTABLES -P INPUT ACCEPT
424 $IPTABLES -P OUTPUT ACCEPT
425 $IPTABLES -P FORWARD ACCEPT
426 uci_revert_state firewall core
427 }