uci firewall
[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
167 config_get src $1 src
168 config_get src_ip $1 src_ip
169 config_get src_mac $1 src_mac
170 config_get src_port $1 src_port
171 config_get dest $1 dest
172 config_get dest_ip $1 dest_ip
173 config_get dest_port $1 dest_port
174 config_get proto $1 proto
175 config_get target $1 target
176 config_get ruleset $1 ruleset
177
178 [ -z "$target" ] && target=DROP
179 [ -n "$src" ] && ZONE=zone_$src || ZONE=INPUT
180 [ -n "$dest" ] && TARGET=zone_${dest}_$target || TARGET=$target
181 $IPTABLES -I $ZONE 1 \
182 ${proto:+-p $proto} \
183 ${src_ip:+-s $src_ip} \
184 ${src_port:+--sport $src_port} \
185 ${src_mac:+-m mac --mac-source $src_mac} \
186 ${dest_ip:+-d $dest_ip} \
187 ${dest_port:+--dport $dest_port} \
188 -j $TARGET
189 }
190
191 fw_forwarding() {
192 local src
193 local dest
194 local masq
195
196 config_get src $1 src
197 config_get dest $1 dest
198 [ -n "$src" ] && z_src=zone_${src}_forward || z_src=FORWARD
199 [ -n "$dest" ] && z_dest=zone_${dest}_ACCEPT || z_dest=ACCEPT
200 $IPTABLES -I $z_src 1 -j $z_dest
201 }
202
203 fw_redirect() {
204 local src
205 local src_ip
206 local src_port
207 local src_dport
208 local src_mac
209 local dest_ip
210 local dest_port
211 local protocol
212
213 config_get src $1 src
214 config_get src_ip $1 src_ip
215 config_get src_port $1 src_port
216 config_get src_dport $1 src_dport
217 config_get src_mac $1 src_mac
218 config_get dest_ip $1 dest_ip
219 config_get dest_port $1 dest_port
220 config_get protocol $1 protocol
221 [ -z "$src" -o -z "$dest_ip" ] && { \
222 echo "redirect needs src and dest_ip"; return ; }
223 $IPTABLES -A zone_${src}_prerouting -t nat \
224 ${protocol:+-p $protocol} \
225 ${src_ip:+-s $srcdip} \
226 ${src_port:+--sport $src_port} \
227 ${src_dport:+--dport $src_dport} \
228 ${src_mac:+-m mac --mac-source $src_mac} \
229 -j DNAT --to-destination $dest_ip${dest_port:+:$dest_port}
230 $IPTABLES -I zone_${src}_forward 1 \
231 ${protocol:+-p $protocol} \
232 -d $dest_ip \
233 ${src_ip:+-s $srcdip} \
234 ${src_port:+--sport $src_port} \
235 ${dest_port:+--dport $dest_port} \
236 ${src_mac:+-m mac --mac-source $src_mac} \
237 -j ACCEPT
238 }
239
240 fw_include() {
241 local path
242 config_get path $1 path
243 [ -e $path ] && . $path
244 }
245
246 fw_addif() {
247 local up
248 local ifname
249 config_get up $1 up
250 config_get ifname $1 ifname
251 [ -n "$up" ] || return 0
252 (ACTION="ifup" INTERFACE="$1" . /etc/hotplug.d/iface/20-firewall)
253 }
254
255 fw_init() {
256 echo "Loading defaults"
257 config_foreach fw_defaults defaults
258 echo "Loading zones"
259 config_foreach fw_zone zone
260 echo "Loading rules"
261 config_foreach fw_rule rule
262 echo "Loading forwarding"
263 config_foreach fw_forwarding forwarding
264 echo "Loading redirects"
265 config_foreach fw_redirect redirect
266 echo "Loading includes"
267 config_foreach fw_include include
268
269 uci_set_state firewall core "" firewall_state
270 uci_set_state firewall core loaded 1
271 unset CONFIG_APPEND
272 config_load network
273 config_foreach fw_addif interface
274 }
275
276 fw_stop() {
277 $IPTABLES -F
278 $IPTABLES -t nat -F
279 $IPTABLES -t mangle -F
280 $IPTABLES -X -t nat
281 $IPTABLES -X
282 $IPTABLES -P INPUT ACCEPT
283 $IPTABLES -P OUTPUT ACCEPT
284 $IPTABLES -P FORWARD ACCEPT
285 }