Add strongswan (4.3.6) for testing.
[people/pmueller/ipfire-2.x.git] / src / initscripts / init.d / firewall
1 #!/bin/sh
2
3 eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
4 eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
5 eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
6 IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
7
8 if [ -f /var/ipfire/red/device ]; then
9 DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
10 fi
11
12 iptables_init() {
13 # Flush all rules and delete all custom chains
14 /sbin/iptables -F
15 /sbin/iptables -t nat -F
16 /sbin/iptables -t mangle -F
17 /sbin/iptables -X
18 /sbin/iptables -t nat -X
19 /sbin/iptables -t mangle -X
20
21 # Set up policies
22 /sbin/iptables -P INPUT DROP
23 /sbin/iptables -P FORWARD DROP
24 /sbin/iptables -P OUTPUT ACCEPT
25
26 # Empty LOG_DROP and LOG_REJECT chains
27 /sbin/iptables -N LOG_DROP
28 /sbin/iptables -A LOG_DROP -m limit --limit 10/minute -j LOG
29 /sbin/iptables -A LOG_DROP -j DROP
30 /sbin/iptables -N LOG_REJECT
31 /sbin/iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
32 /sbin/iptables -A LOG_REJECT -j REJECT
33
34 # This chain will log, then DROPs packets with certain bad combinations
35 # of flags might indicate a port-scan attempt (xmas, null, etc)
36 /sbin/iptables -N PSCAN
37 if [ "$DROPPORTSCAN" == "on" ]; then
38 /sbin/iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
39 /sbin/iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
40 /sbin/iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
41 /sbin/iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
42 fi
43 /sbin/iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
44
45 # New tcp packets without SYN set - could well be an obscure type of port scan
46 # that's not covered above, may just be a broken windows machine
47 /sbin/iptables -N NEWNOTSYN
48 if [ "$DROPNEWNOTSYN" == "on" ]; then
49 /sbin/iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN "
50 fi
51 /sbin/iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
52
53 # Chain to contain all the rules relating to bad TCP flags
54 /sbin/iptables -N BADTCP
55
56 # Disallow packets frequently used by port-scanners
57 # nmap xmas
58 /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
59 # Null
60 /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
61 # FIN
62 /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
63 # SYN/RST (also catches xmas variants that set SYN+RST+...)
64 /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
65 # SYN/FIN (QueSO or nmap OS probe)
66 /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
67 # NEW TCP without SYN
68 /sbin/iptables -A BADTCP -p tcp ! --syn -m state --state NEW -j NEWNOTSYN
69
70 /sbin/iptables -A INPUT -j BADTCP
71 /sbin/iptables -A FORWARD -j BADTCP
72
73 }
74
75 iptables_red() {
76 /sbin/iptables -F REDINPUT
77 /sbin/iptables -F REDFORWARD
78 /sbin/iptables -t nat -F REDNAT
79
80 # PPPoE / PPTP Device
81 if [ "$IFACE" != "" ]; then
82 # PPPoE / PPTP
83 if [ "$DEVICE" != "" ]; then
84 /sbin/iptables -A REDINPUT -i $DEVICE -j ACCEPT
85 fi
86 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
87 if [ "$RED_DEV" != "" ]; then
88 /sbin/iptables -A REDINPUT -i $RED_DEV -j ACCEPT
89 fi
90 fi
91 fi
92
93 # PPTP over DHCP
94 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
95 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
96 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
97 fi
98
99 # Orange pinholes
100 if [ "$ORANGE_DEV" != "" ]; then
101 # This rule enables a host on ORANGE network to connect to the outside
102 # (only if we have a red connection)
103 if [ "$IFACE" != "" ]; then
104 /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
105 fi
106 fi
107
108 if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
109 # DHCP
110 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
111 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
112 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
113 fi
114 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
115 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
116 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
117 fi
118
119 # Outgoing masquerading
120 /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
121
122 fi
123 }
124
125 # See how we were called.
126 case "$1" in
127 start)
128 iptables_init
129
130 # Limit Packets- helps reduce dos/syn attacks
131 # original do nothing line
132 #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit --limit 10/sec
133 # the correct one, but the negative '!' do nothing...
134 #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN ! -m limit --limit 10/sec -j DROP
135
136 # Fix for braindead ISP's
137 /sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
138
139 # CUSTOM chains, can be used by the users themselves
140 /sbin/iptables -N CUSTOMINPUT
141 /sbin/iptables -A INPUT -j CUSTOMINPUT
142 /sbin/iptables -N CUSTOMFORWARD
143 /sbin/iptables -A FORWARD -j CUSTOMFORWARD
144 /sbin/iptables -N CUSTOMOUTPUT
145 /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
146 /sbin/iptables -N OUTGOINGFW
147 /sbin/iptables -A OUTPUT -j OUTGOINGFW
148 /sbin/iptables -t nat -N CUSTOMPREROUTING
149 /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
150 /sbin/iptables -t nat -N CUSTOMPOSTROUTING
151 /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
152
153 # IPTV chains for IGMPPROXY
154 /sbin/iptables -N IPTVINPUT
155 /sbin/iptables -A INPUT -j IPTVINPUT
156 /sbin/iptables -N IPTVFORWARD
157 /sbin/iptables -A FORWARD -j IPTVFORWARD
158
159 # filtering from GUI
160 /sbin/iptables -N GUIINPUT
161 /sbin/iptables -A INPUT -j GUIINPUT
162 /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
163
164 # Accept everything connected
165 /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
166 /sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
167
168 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
169 /sbin/iptables -N IPSECINPUT
170 /sbin/iptables -N IPSECFORWARD
171 /sbin/iptables -N IPSECOUTPUT
172 /sbin/iptables -N OPENSSLVIRTUAL
173 /sbin/iptables -A INPUT -j IPSECINPUT
174 /sbin/iptables -A INPUT -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL INPUT"
175 /sbin/iptables -A FORWARD -j IPSECFORWARD
176 /sbin/iptables -A FORWARD -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL FORWARD"
177 /sbin/iptables -A OUTPUT -j IPSECOUTPUT
178 #/sbin/iptables -t nat -N IPSECNAT
179 #/sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
180
181 # Outgoing Firewall
182 /sbin/iptables -A FORWARD -j OUTGOINGFW
183
184 # localhost and ethernet.
185 /sbin/iptables -A INPUT -i lo -m state --state NEW -j ACCEPT
186 /sbin/iptables -A INPUT -s 127.0.0.0/8 -m state --state NEW -j DROP # Loopback not on lo
187 /sbin/iptables -A INPUT -d 127.0.0.0/8 -m state --state NEW -j DROP
188 /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT
189 /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP
190 /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP
191 /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT ! -p icmp
192 /sbin/iptables -A FORWARD -i $GREEN_DEV -m state --state NEW -j ACCEPT
193
194 # If a host on orange tries to initiate a connection to IPFire's red IP and
195 # the connection gets DNATed back through a port forward to a server on orange
196 # we end up with orange -> orange traffic passing through IPFire
197 [ "$ORANGE_DEV" != "" ] && /sbin/iptables -A FORWARD -i $ORANGE_DEV -o $ORANGE_DEV -m state --state NEW -j ACCEPT
198
199 # allow DHCP on BLUE to be turned on/off
200 /sbin/iptables -N DHCPBLUEINPUT
201 /sbin/iptables -A INPUT -j DHCPBLUEINPUT
202
203 # OPenSSL
204 /sbin/iptables -N OPENSSLPHYSICAL
205 /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
206
207 # WIRELESS chains
208 /sbin/iptables -N WIRELESSINPUT
209 /sbin/iptables -A INPUT -m state --state NEW -j WIRELESSINPUT
210 /sbin/iptables -N WIRELESSFORWARD
211 /sbin/iptables -A FORWARD -m state --state NEW -j WIRELESSFORWARD
212
213 # RED chain, used for the red interface
214 /sbin/iptables -N REDINPUT
215 /sbin/iptables -A INPUT -j REDINPUT
216 /sbin/iptables -N REDFORWARD
217 /sbin/iptables -A FORWARD -j REDFORWARD
218 /sbin/iptables -t nat -N REDNAT
219 /sbin/iptables -t nat -A POSTROUTING -j REDNAT
220
221 iptables_red
222
223 # DMZ pinhole chain. setdmzholes setuid prog adds rules here to allow
224 # ORANGE to talk to GREEN / BLUE.
225 /sbin/iptables -N DMZHOLES
226 if [ "$ORANGE_DEV" != "" ]; then
227 /sbin/iptables -A FORWARD -i $ORANGE_DEV -m state --state NEW -j DMZHOLES
228 fi
229
230 # XTACCESS chain, used for external access
231 /sbin/iptables -N XTACCESS
232 /sbin/iptables -A INPUT -m state --state NEW -j XTACCESS
233
234 # PORTFWACCESS chain, used for portforwarding
235 /sbin/iptables -N PORTFWACCESS
236 /sbin/iptables -A FORWARD -m state --state NEW -j PORTFWACCESS
237
238 # Custom prerouting chains (for transparent proxy and port forwarding)
239 /sbin/iptables -t nat -N SQUID
240 /sbin/iptables -t nat -A PREROUTING -j SQUID
241 /sbin/iptables -t nat -N PORTFW
242 /sbin/iptables -t nat -A PREROUTING -j PORTFW
243
244 # upnp chain for our upnp daemon
245 /sbin/iptables -t nat -N UPNPFW
246 /sbin/iptables -t nat -A PREROUTING -j UPNPFW
247
248
249 # Custom mangle chain (for port fowarding)
250 /sbin/iptables -t mangle -N PORTFWMANGLE
251 /sbin/iptables -t mangle -A PREROUTING -j PORTFWMANGLE
252
253 # Postrouting rules (for port forwarding)
254 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT \
255 --to-source $GREEN_ADDRESS
256 if [ "$BLUE_DEV" != "" ]; then
257 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
258 fi
259 if [ "$ORANGE_DEV" != "" ]; then
260 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
261 fi
262
263 # run local firewall configuration, if present
264 if [ -x /etc/sysconfig/firewall.local ]; then
265 /etc/sysconfig/firewall.local start
266 fi
267
268 # last rule in input and forward chain is for logging.
269
270 if [ "$DROPINPUT" == "on" ]; then
271 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
272 fi
273 /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
274 if [ "$DROPOUTPUT" == "on" ]; then
275 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
276 fi
277 /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
278 ;;
279 startovpn)
280 # run openvpn
281 /usr/local/bin/openvpnctrl --create-chains-and-rules
282 ;;
283 stop)
284 iptables_init
285 # Accept everyting connected
286 /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
287
288 # localhost and ethernet.
289 /sbin/iptables -A INPUT -i lo -j ACCEPT
290 /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT
291
292 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
293 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
294 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
295 fi
296 if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "DHCP" ]; then
297 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
298 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
299 fi
300
301 # run local firewall configuration, if present
302 if [ -x /etc/sysconfig/firewall.local ]; then
303 /etc/sysconfig/firewall.local stop
304 fi
305
306 if [ "$DROPINPUT" == "on" ]; then
307 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
308 fi
309 /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
310 if [ "$DROPOUTPUT" == "on" ]; then
311 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
312 fi
313 /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
314 ;;
315 stopovpn)
316 # stop openvpn
317 /usr/local/bin/openvpnctrl --delete-chains-and-rules
318 ;;
319 reload)
320 iptables_red
321
322 # run local firewall configuration, if present
323 if [ -x /etc/sysconfig/firewall.local ]; then
324 /etc/sysconfig/firewall.local reload
325 fi
326 ;;
327 restart)
328 $0 stop
329 $0 start
330 ;;
331 *)
332 echo "Usage: $0 {start|stop|reload|restart}"
333 exit 1
334 ;;
335 esac
336
337 exit 0