410ff8737115425eca5b5dc36ac10398bbad82c1
[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 -p tcp -o $IFACE -j ACCEPT
105 /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -p udp -o $IFACE -j ACCEPT
106 fi
107 fi
108
109 if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
110 # DHCP
111 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
112 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
113 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
114 fi
115 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
116 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
117 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
118 fi
119
120 # Outgoing masquerading
121 /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
122
123 fi
124 }
125
126 # See how we were called.
127 case "$1" in
128 start)
129 iptables_init
130
131 # Limit Packets- helps reduce dos/syn attacks
132 # original do nothing line
133 #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit --limit 10/sec
134 # the correct one, but the negative '!' do nothing...
135 #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit ! --limit 10/sec -j DROP
136
137 # Fix for braindead ISP's
138 /sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
139
140 # CUSTOM chains, can be used by the users themselves
141 /sbin/iptables -N CUSTOMINPUT
142 /sbin/iptables -A INPUT -j CUSTOMINPUT
143 /sbin/iptables -N CUSTOMFORWARD
144 /sbin/iptables -A FORWARD -j CUSTOMFORWARD
145 /sbin/iptables -N CUSTOMOUTPUT
146 /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
147 /sbin/iptables -N OUTGOINGFW
148 /sbin/iptables -A OUTPUT -j OUTGOINGFW
149 /sbin/iptables -t nat -N CUSTOMPREROUTING
150 /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
151 /sbin/iptables -t nat -N CUSTOMPOSTROUTING
152 /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
153
154 # IPTV chains for IGMPPROXY
155 /sbin/iptables -N IPTVINPUT
156 /sbin/iptables -A INPUT -j IPTVINPUT
157 /sbin/iptables -N IPTVFORWARD
158 /sbin/iptables -A FORWARD -j IPTVFORWARD
159
160 # filtering from GUI
161 /sbin/iptables -N GUIINPUT
162 /sbin/iptables -A INPUT -j GUIINPUT
163 /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
164
165 # Accept everything connected
166 /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
167 /sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
168
169 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
170 /sbin/iptables -N IPSECVIRTUAL
171 /sbin/iptables -N OPENSSLVIRTUAL
172 /sbin/iptables -A INPUT -j IPSECVIRTUAL -m comment --comment "IPSECVIRTUAL INPUT"
173 /sbin/iptables -A INPUT -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL INPUT"
174 /sbin/iptables -A FORWARD -j IPSECVIRTUAL -m comment --comment "IPSECVIRTUAL FORWARD"
175 /sbin/iptables -A FORWARD -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL FORWARD"
176 /sbin/iptables -t nat -N IPSECNAT
177 /sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
178
179 # Outgoing Firewall
180 /sbin/iptables -A FORWARD -j OUTGOINGFW
181
182 # localhost and ethernet.
183 /sbin/iptables -A INPUT -i lo -m state --state NEW -j ACCEPT
184 /sbin/iptables -A INPUT -s 127.0.0.0/8 -m state --state NEW -j DROP # Loopback not on lo
185 /sbin/iptables -A INPUT -d 127.0.0.0/8 -m state --state NEW -j DROP
186 /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT
187 /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP
188 /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP
189 /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT ! -p icmp
190 /sbin/iptables -A FORWARD -i $GREEN_DEV -m state --state NEW -j ACCEPT
191
192 # If a host on orange tries to initiate a connection to IPFire's red IP and
193 # the connection gets DNATed back through a port forward to a server on orange
194 # we end up with orange -> orange traffic passing through IPFire
195 [ "$ORANGE_DEV" != "" ] && /sbin/iptables -A FORWARD -i $ORANGE_DEV -o $ORANGE_DEV -m state --state NEW -j ACCEPT
196
197 # allow DHCP on BLUE to be turned on/off
198 /sbin/iptables -N DHCPBLUEINPUT
199 /sbin/iptables -A INPUT -j DHCPBLUEINPUT
200
201 # IPSec
202 /sbin/iptables -N IPSECPHYSICAL
203 /sbin/iptables -A INPUT -j IPSECPHYSICAL
204
205 # OPenSSL
206 /sbin/iptables -N OPENSSLPHYSICAL
207 /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
208
209 # WIRELESS chains
210 /sbin/iptables -N WIRELESSINPUT
211 /sbin/iptables -A INPUT -m state --state NEW -j WIRELESSINPUT
212 /sbin/iptables -N WIRELESSFORWARD
213 /sbin/iptables -A FORWARD -m state --state NEW -j WIRELESSFORWARD
214
215 # RED chain, used for the red interface
216 /sbin/iptables -N REDINPUT
217 /sbin/iptables -A INPUT -j REDINPUT
218 /sbin/iptables -N REDFORWARD
219 /sbin/iptables -A FORWARD -j REDFORWARD
220 /sbin/iptables -t nat -N REDNAT
221 /sbin/iptables -t nat -A POSTROUTING -j REDNAT
222
223 iptables_red
224
225 # DMZ pinhole chain. setdmzholes setuid prog adds rules here to allow
226 # ORANGE to talk to GREEN / BLUE.
227 /sbin/iptables -N DMZHOLES
228 if [ "$ORANGE_DEV" != "" ]; then
229 /sbin/iptables -A FORWARD -i $ORANGE_DEV -m state --state NEW -j DMZHOLES
230 fi
231
232 # XTACCESS chain, used for external access
233 /sbin/iptables -N XTACCESS
234 /sbin/iptables -A INPUT -m state --state NEW -j XTACCESS
235
236 # PORTFWACCESS chain, used for portforwarding
237 /sbin/iptables -N PORTFWACCESS
238 /sbin/iptables -A FORWARD -m state --state NEW -j PORTFWACCESS
239
240 # Custom prerouting chains (for transparent proxy and port forwarding)
241 /sbin/iptables -t nat -N SQUID
242 /sbin/iptables -t nat -A PREROUTING -j SQUID
243 /sbin/iptables -t nat -N PORTFW
244 /sbin/iptables -t nat -A PREROUTING -j PORTFW
245
246 # upnp chain for our upnp daemon
247 /sbin/iptables -t nat -N UPNPFW
248 /sbin/iptables -t nat -A PREROUTING -j UPNPFW
249
250
251 # Custom mangle chain (for port fowarding)
252 /sbin/iptables -t mangle -N PORTFWMANGLE
253 /sbin/iptables -t mangle -A PREROUTING -j PORTFWMANGLE
254
255 # Postrouting rules (for port forwarding)
256 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT \
257 --to-source $GREEN_ADDRESS
258 if [ "$BLUE_DEV" != "" ]; then
259 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
260 fi
261 if [ "$ORANGE_DEV" != "" ]; then
262 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
263 fi
264
265 # run local firewall configuration, if present
266 if [ -x /etc/sysconfig/firewall.local ]; then
267 /etc/sysconfig/firewall.local start
268 fi
269
270 # last rule in input and forward chain is for logging.
271
272 if [ "$DROPINPUT" == "on" ]; then
273 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
274 fi
275 /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
276 if [ "$DROPOUTPUT" == "on" ]; then
277 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
278 fi
279 /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
280 ;;
281 startovpn)
282 # run openvpn
283 /usr/local/bin/openvpnctrl --create-chains-and-rules
284 ;;
285 stop)
286 iptables_init
287 # Accept everyting connected
288 /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
289
290 # localhost and ethernet.
291 /sbin/iptables -A INPUT -i lo -j ACCEPT
292 /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT
293
294 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
295 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
296 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
297 fi
298 if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "DHCP" ]; then
299 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
300 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
301 fi
302
303 # run local firewall configuration, if present
304 if [ -x /etc/sysconfig/firewall.local ]; then
305 /etc/sysconfig/firewall.local stop
306 fi
307
308 if [ "$DROPINPUT" == "on" ]; then
309 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
310 fi
311 /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
312 if [ "$DROPOUTPUT" == "on" ]; then
313 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
314 fi
315 /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
316 ;;
317 stopovpn)
318 # stop openvpn
319 /usr/local/bin/openvpnctrl --delete-chains-and-rules
320 ;;
321 reload)
322 iptables_red
323
324 # run local firewall configuration, if present
325 if [ -x /etc/sysconfig/firewall.local ]; then
326 /etc/sysconfig/firewall.local reload
327 fi
328 ;;
329 restart)
330 $0 stop
331 $0 start
332 ;;
333 *)
334 echo "Usage: $0 {start|stop|reload|restart}"
335 exit 1
336 ;;
337 esac
338
339 exit 0