make sure uci firewall reverts its states when stopped
[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 DEF_INPUT=DROP
20 DEF_OUTPUT=DROP
21 DEF_FORWARD=DROP
22
23 load_policy() {
24 config_get input $1 input
25 config_get output $1 output
26 config_get forward $1 forward
27
28 [ -z "$input" ] && input=$DEF_INPUT
29 [ -z "$output" ] && output=$DEF_OUTPUT
30 [ -z "$forward" ] && forward=$DEF_FORWARD
31 }
32
33 create_zone() {
34 local exists
35
36 [ "$1" == "loopback" ] && return
37
38 config_get exists $ZONE_LIST $1
39 [ -n "$exists" ] && return
40 config_set $ZONE_LIST $1 1
41
42 $IPTABLES -N zone_$1
43 $IPTABLES -N zone_$1_ACCEPT
44 $IPTABLES -N zone_$1_DROP
45 $IPTABLES -N zone_$1_REJECT
46 $IPTABLES -N zone_$1_forward
47 $IPTABLES -A zone_$1_forward -j zone_$1_$5
48 $IPTABLES -A zone_$1 -j zone_$1_$3
49 $IPTABLES -A OUTPUT -j zone_$1_$4
50 $IPTABLES -N zone_$1_nat -t nat
51 $IPTABLES -N zone_$1_prerouting -t nat
52 [ "$6" == "1" ] && $IPTABLES -t nat -A POSTROUTING -j zone_$2_nat
53 }
54
55 addif() {
56 logger "adding $1 to firewall zone $2"
57 $IPTABLES -A INPUT -i $1 -j zone_$2
58 $IPTABLES -I zone_$2_ACCEPT 1 -o $1 -j ACCEPT
59 $IPTABLES -I zone_$2_DROP 1 -o $1 -j DROP
60 $IPTABLES -I zone_$2_REJECT 1 -o $1 -j REJECT
61 $IPTABLES -I zone_$2_ACCEPT 1 -i $1 -j ACCEPT
62 $IPTABLES -I zone_$2_DROP 1 -i $1 -j DROP
63 $IPTABLES -I zone_$2_REJECT 1 -i $1 -j REJECT
64 $IPTABLES -I zone_$2_nat 1 -t nat -o $1 -j MASQUERADE
65 $IPTABLES -I PREROUTING 1 -t nat -i $1 -j zone_$2_prerouting
66 $IPTABLES -A FORWARD -i $1 -j zone_$2_forward
67 }
68
69 delif() {
70 logger "removing $1 from firewall zone $2"
71 $IPTABLES -D INPUT -i $1 -j zone_$2
72 $IPTABLES -D zone_$2_ACCEPT -o $1 -j ACCEPT
73 $IPTABLES -D zone_$2_DROP -o $1 -j DROP
74 $IPTABLES -D zone_$2_REJECT -o $1 -j REJECT
75 $IPTABLES -D zone_$2_ACCEPT -i $1 -j ACCEPT
76 $IPTABLES -D zone_$2_DROP -i $1 -j DROP
77 $IPTABLES -D zone_$2_REJECT -i $1 -j REJECT
78 $IPTABLES -D zone_$2_nat -t nat -o $1 -j MASQUERADE
79 $IPTABLES -D PREROUTING -t nat -i $1 -j zone_$2_prerouting
80 $IPTABLES -D FORWARD -i $1 -j zone_$2_forward
81 }
82
83 load_synflood() {
84 echo "Loading synflood protection"
85 $IPTABLES -N SYN_FLOOD
86 $IPTABLES -A SYN_FLOOD -p tcp --syn -m limit --limit ${1}/second --limit-burst $2 -j RETURN
87 $IPTABLES -A SYN_FLOOD -p ! tcp -j RETURN
88 $IPTABLES -A SYN_FLOOD -p tcp ! --syn -j RETURN
89 $IPTABLES -A SYN_FLOOD -j LOG --log-prefix "syn_flood: "
90 $IPTABLES -A SYN_FLOOD -j DROP
91 $IPTABLES -A INPUT -p tcp --syn -j SYN_FLOOD
92 }
93
94 fw_defaults() {
95 load_policy $1
96 DEF_INPUT=$input
97 DEF_OUTPUT=$output
98 DEF_FORWARD=$forward
99
100 echo 1 > /proc/sys/net/ipv4/tcp_syncookies
101 for f in /proc/sys/net/ipv4/conf/*/accept_redirects
102 do
103 echo 0 > $f
104 done
105 for f in /proc/sys/net/ipv4/conf/*/accept_source_route
106 do
107 echo 0 > $f
108 done
109
110 $IPTABLES -F
111 $IPTABLES -t nat -F
112 $IPTABLES -t mangle -F
113 $IPTABLES -X -t nat
114 $IPTABLES -X
115
116 $IPTABLES -P INPUT $input
117 $IPTABLES -A INPUT -m state --state INVALID -j DROP
118 $IPTABLES -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
119
120 $IPTABLES -P OUTPUT $output
121 $IPTABLES -A OUTPUT -m state --state INVALID -j DROP
122 $IPTABLES -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
123
124 $IPTABLES -P FORWARD $forward
125 $IPTABLES -A FORWARD -m state --state INVALID -j DROP
126 $IPTABLES -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
127 $IPTABLES -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
128
129 $IPTABLES -A INPUT -i lo -j ACCEPT
130 $IPTABLES -A OUTPUT -o lo -j ACCEPT
131
132 config_get syn_flood $1 syn_flood
133 config_get syn_rate $1 syn_rate
134 config_get syn_burst $1 syn_burst
135
136 [ -z "$syn_rate" ] && syn_rate=25
137 [ -z "$syn_burst" ] && syn_burst=50
138 [ "$syn_flood" == "1" ] && load_synflood $syn_rate $syn_burst
139 }
140
141 fw_zone() {
142 local name
143 local network
144 local masq
145
146 config_get name $1 name
147 config_get network $1 network
148 config_get masq $1 masq
149 load_policy $1
150
151 [ -z "$network" ] && network=$name
152 create_zone "$name" "$network" "$input" "$output" "$forward" "$masq"
153 }
154
155 fw_rule() {
156 local src
157 local src_ip
158 local src_mac
159 local src_port
160 local src_mac
161 local dest
162 local dest_ip
163 local dest_port
164 local proto
165 local target
166 local ruleset
167
168 config_get src $1 src
169 config_get src_ip $1 src_ip
170 config_get src_mac $1 src_mac
171 config_get src_port $1 src_port
172 config_get dest $1 dest
173 config_get dest_ip $1 dest_ip
174 config_get dest_port $1 dest_port
175 config_get proto $1 proto
176 config_get target $1 target
177 config_get ruleset $1 ruleset
178
179 [ -z "$target" ] && target=DROP
180 [ -n "$src" ] && ZONE=zone_$src || ZONE=INPUT
181 [ -n "$dest" ] && TARGET=zone_${dest}_$target || TARGET=$target
182 [ -n "$dest_port" -a -z "$proto" ] && { \
183 echo "dport may only be used it proto is defined"; return; }
184 [ -n "$src_port" -a -z "$proto" ] && { \
185 echo "sport may only be used it proto is defined"; return; }
186 $IPTABLES -I $ZONE 1 \
187 ${proto:+-p $proto} \
188 ${src_ip:+-s $src_ip} \
189 ${src_port:+--sport $src_port} \
190 ${src_mac:+-m mac --mac-source $src_mac} \
191 ${dest_ip:+-d $dest_ip} \
192 ${dest_port:+--dport $dest_port} \
193 -j $TARGET
194 }
195
196 fw_forwarding() {
197 local src
198 local dest
199 local masq
200
201 config_get src $1 src
202 config_get dest $1 dest
203 [ -n "$src" ] && z_src=zone_${src}_forward || z_src=FORWARD
204 [ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
205 $IPTABLES -I $z_src 1 -j $z_dest
206 }
207
208 fw_redirect() {
209 local src
210 local src_ip
211 local src_port
212 local src_dport
213 local src_mac
214 local dest_ip
215 local dest_port
216 local proto
217
218 config_get src $1 src
219 config_get src_ip $1 src_ip
220 config_get src_port $1 src_port
221 config_get src_dport $1 src_dport
222 config_get src_mac $1 src_mac
223 config_get dest_ip $1 dest_ip
224 config_get dest_port $1 dest_port
225 config_get proto $1 proto
226 [ -z "$src" -o -z "$dest_ip" ] && { \
227 echo "redirect needs src and dest_ip"; return ; }
228 [ -n "$dest_port" -a -z "$proto" ] && { \
229 echo "dport may only be used it proto is defined"; return; }
230 [ -n "$src_port" -a -z "$proto" ] && { \
231 echo "sport may only be used it proto is defined"; return; }
232
233 src_port_first=${src_port%-*}
234 src_port_last=${src_port#*-}
235 [ "$src_port_first" -ne "$src_port_last" ] && { \
236 src_port="$src_port_first:$src_port_last"; }
237
238 src_dport_first=${src_dport%-*}
239 src_dport_last=${src_dport#*-}
240 [ "$src_dport_first" -ne "$src_dport_last" ] && { \
241 src_dport="$src_dport_first:$src_dport_last"; }
242
243 $IPTABLES -A zone_${src}_prerouting -t nat \
244 ${proto:+-p $proto} \
245 ${src_ip:+-s $src_ip} \
246 ${src_port:+--sport $src_port} \
247 ${src_dport:+--dport $src_dport} \
248 ${src_mac:+-m mac --mac-source $src_mac} \
249 -j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
250
251 dest_port_first=${dest_port%-*}
252 dest_port_last=${dest_port#*-}
253 [ "$dest_port_first" -ne "$dest_port_last" ] && { \
254 dest_port="$dest_port_first:$dest_port_last"; }
255
256 $IPTABLES -I zone_${src}_forward 1 \
257 ${proto:+-p $proto} \
258 -d $dest_ip \
259 ${src_ip:+-s $src_ip} \
260 ${src_port:+--sport $src_port} \
261 ${dest_port:+--dport $dest_port} \
262 ${src_mac:+-m mac --mac-source $src_mac} \
263 -j ACCEPT
264 }
265
266 fw_include() {
267 local path
268 config_get path $1 path
269 [ -e $path ] && . $path
270 }
271
272 fw_addif() {
273 local up
274 local ifname
275 config_get up $1 up
276 config_get ifname $1 ifname
277 [ -n "$up" ] || return 0
278 (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
279 }
280
281 fw_custom_chains() {
282 $IPTABLES -N input_rule
283 $IPTABLES -N output_rule
284 $IPTABLES -N forward_rule
285 $IPTABLES -N prerouting_rule -t nat
286 $IPTABLES -N postrouting_rule -t nat
287 $IPTABLES -A INPUT -j input_rule
288 $IPTABLES -A OUTPUT -j output_rule
289 $IPTABLES -A FORWARD -j forward_rule
290 $IPTABLES -A PREROUTING -t nat -j prerouting_rule
291 $IPTABLES -A POSTROUTING -t nat -j postrouting_rule
292 }
293
294 fw_init() {
295 echo "Loading defaults"
296 config_foreach fw_defaults defaults
297 echo "Loading zones"
298 config_foreach fw_zone zone
299 echo "Loading rules"
300 config_foreach fw_rule rule
301 echo "Loading forwarding"
302 config_foreach fw_forwarding forwarding
303 echo "Loading redirects"
304 config_foreach fw_redirect redirect
305 echo "Adding custom chains"
306 fw_custom_chains
307 echo "Loading includes"
308 config_foreach fw_include include
309
310 uci_set_state firewall core "" firewall_state
311 uci_set_state firewall core loaded 1
312 unset CONFIG_APPEND
313 config_load network
314 config_foreach fw_addif interface
315 }
316
317 fw_stop() {
318 $IPTABLES -F
319 $IPTABLES -t nat -F
320 $IPTABLES -t mangle -F
321 $IPTABLES -X -t nat
322 $IPTABLES -X
323 $IPTABLES -P INPUT ACCEPT
324 $IPTABLES -P OUTPUT ACCEPT
325 $IPTABLES -P FORWARD ACCEPT
326 uci_revert_state firewall core
327 }