Remove from Input chain, changed order of the filters since
[people/pmueller/ipfire-2.x.git] / src / initscripts / init.d / firewall
CommitLineData
3a1019f6
MT
1#!/bin/sh
2
3eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
4eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
fe0cd647 5eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
3a1019f6
MT
6IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
7
8if [ -f /var/ipfire/red/device ]; then
9 DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
10fi
11
12iptables_init() {
13 # Flush all rules and delete all custom chains
14 /sbin/iptables -F
15 /sbin/iptables -t nat -F
16 /sbin/iptables -t mangle -F
17 /sbin/iptables -X
18 /sbin/iptables -t nat -X
19 /sbin/iptables -t mangle -X
20
21 # Set up policies
22 /sbin/iptables -P INPUT DROP
23 /sbin/iptables -P FORWARD DROP
24 /sbin/iptables -P OUTPUT ACCEPT
25
26 # Empty LOG_DROP and LOG_REJECT chains
27 /sbin/iptables -N LOG_DROP
28 /sbin/iptables -A LOG_DROP -m limit --limit 10/minute -j LOG
29 /sbin/iptables -A LOG_DROP -j DROP
30 /sbin/iptables -N LOG_REJECT
31 /sbin/iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
32 /sbin/iptables -A LOG_REJECT -j REJECT
33
34 # This chain will log, then DROPs packets with certain bad combinations
35 # of flags might indicate a port-scan attempt (xmas, null, etc)
36 /sbin/iptables -N PSCAN
5595bc03 37 if [ "$DROPPORTSCAN" == "on" ]; then
97fe1741 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"
fe0cd647 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"
97fe1741
CS
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"
5595bc03 42 fi
97fe1741 43 /sbin/iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
3a1019f6
MT
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
5595bc03 48 if [ "$DROPNEWNOTSYN" == "on" ]; then
97fe1741 49 /sbin/iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN "
5595bc03 50 fi
97fe1741 51 /sbin/iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
3a1019f6
MT
52
53 # Chain to contain all the rules relating to bad TCP flags
54 /sbin/iptables -N BADTCP
55
56 # Disallow packets frequently used by port-scanners
57 # nmap xmas
58 /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
59 # Null
60 /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
61 # FIN
62 /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
63 # SYN/RST (also catches xmas variants that set SYN+RST+...)
64 /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
65 # SYN/FIN (QueSO or nmap OS probe)
66 /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
67 # NEW TCP without SYN
68 /sbin/iptables -A BADTCP -p tcp ! --syn -m state --state NEW -j NEWNOTSYN
69
70 /sbin/iptables -A INPUT -j BADTCP
71 /sbin/iptables -A FORWARD -j BADTCP
72
73}
74
75iptables_red() {
76 /sbin/iptables -F REDINPUT
77 /sbin/iptables -F REDFORWARD
78 /sbin/iptables -t nat -F REDNAT
79
80 # PPPoE / PPTP Device
81 if [ "$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
139a9b4f 104 /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
3a1019f6
MT
105 fi
106 fi
107
108 if [ "$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
db073a10
AF
119 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
120 /sbin/iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
3a1019f6
MT
121 /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
122
123 fi
124}
125
126# See how we were called.
127case "$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...
9efdd899 135 #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN ! -m limit --limit 10/sec -j DROP
3a1019f6
MT
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
e050adc8
CS
143 /sbin/iptables -N GUARDIANINPUT
144 /sbin/iptables -A INPUT -j GUARDIANINPUT
3a1019f6
MT
145 /sbin/iptables -N CUSTOMFORWARD
146 /sbin/iptables -A FORWARD -j CUSTOMFORWARD
147 /sbin/iptables -N CUSTOMOUTPUT
148 /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
4cb74dce 149 /sbin/iptables -N OUTGOINGFW
d9716b06 150 /sbin/iptables -N OUTGOINGFWMAC
4cb74dce 151 /sbin/iptables -A OUTPUT -j OUTGOINGFW
3a1019f6
MT
152 /sbin/iptables -t nat -N CUSTOMPREROUTING
153 /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
154 /sbin/iptables -t nat -N CUSTOMPOSTROUTING
155 /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
156
daa1ceba
AF
157 # IPTV chains for IGMPPROXY
158 /sbin/iptables -N IPTVINPUT
159 /sbin/iptables -A INPUT -j IPTVINPUT
160 /sbin/iptables -N IPTVFORWARD
161 /sbin/iptables -A FORWARD -j IPTVFORWARD
162
3a1019f6
MT
163 # filtering from GUI
164 /sbin/iptables -N GUIINPUT
165 /sbin/iptables -A INPUT -j GUIINPUT
905fbf3e 166 /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
3a1019f6
MT
167
168 # Accept everything connected
169 /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
170 /sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
5fd30232
MT
171
172 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
6652626c
AF
173 /sbin/iptables -N IPSECINPUT
174 /sbin/iptables -N IPSECFORWARD
175 /sbin/iptables -N IPSECOUTPUT
5fd30232 176 /sbin/iptables -N OPENSSLVIRTUAL
6652626c 177 /sbin/iptables -A INPUT -j IPSECINPUT
5595bc03 178 /sbin/iptables -A INPUT -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL INPUT"
6652626c 179 /sbin/iptables -A FORWARD -j IPSECFORWARD
5595bc03 180 /sbin/iptables -A FORWARD -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL FORWARD"
6652626c 181 /sbin/iptables -A OUTPUT -j IPSECOUTPUT
c4cd0f7b
AF
182 /sbin/iptables -t nat -N IPSECNAT
183 /sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14 184
4cb74dce 185 # Outgoing Firewall
d9716b06 186 /sbin/iptables -A FORWARD -j OUTGOINGFWMAC
3f8fbea5 187 /sbin/iptables -A FORWARD -j OUTGOINGFW
3a1019f6
MT
188
189 # localhost and ethernet.
190 /sbin/iptables -A INPUT -i lo -m state --state NEW -j ACCEPT
191 /sbin/iptables -A INPUT -s 127.0.0.0/8 -m state --state NEW -j DROP # Loopback not on lo
192 /sbin/iptables -A INPUT -d 127.0.0.0/8 -m state --state NEW -j DROP
193 /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT
194 /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP
195 /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP
dd79c399 196 /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT ! -p icmp
3a1019f6
MT
197 /sbin/iptables -A FORWARD -i $GREEN_DEV -m state --state NEW -j ACCEPT
198
199 # If a host on orange tries to initiate a connection to IPFire's red IP and
200 # the connection gets DNATed back through a port forward to a server on orange
201 # we end up with orange -> orange traffic passing through IPFire
202 [ "$ORANGE_DEV" != "" ] && /sbin/iptables -A FORWARD -i $ORANGE_DEV -o $ORANGE_DEV -m state --state NEW -j ACCEPT
203
3a1019f6
MT
204 # allow DHCP on BLUE to be turned on/off
205 /sbin/iptables -N DHCPBLUEINPUT
206 /sbin/iptables -A INPUT -j DHCPBLUEINPUT
207
5fd30232
MT
208 # OPenSSL
209 /sbin/iptables -N OPENSSLPHYSICAL
210 /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
3a1019f6
MT
211
212 # WIRELESS chains
213 /sbin/iptables -N WIRELESSINPUT
214 /sbin/iptables -A INPUT -m state --state NEW -j WIRELESSINPUT
215 /sbin/iptables -N WIRELESSFORWARD
216 /sbin/iptables -A FORWARD -m state --state NEW -j WIRELESSFORWARD
217
218 # RED chain, used for the red interface
219 /sbin/iptables -N REDINPUT
220 /sbin/iptables -A INPUT -j REDINPUT
221 /sbin/iptables -N REDFORWARD
222 /sbin/iptables -A FORWARD -j REDFORWARD
223 /sbin/iptables -t nat -N REDNAT
224 /sbin/iptables -t nat -A POSTROUTING -j REDNAT
225
226 iptables_red
227
228 # DMZ pinhole chain. setdmzholes setuid prog adds rules here to allow
229 # ORANGE to talk to GREEN / BLUE.
230 /sbin/iptables -N DMZHOLES
231 if [ "$ORANGE_DEV" != "" ]; then
232 /sbin/iptables -A FORWARD -i $ORANGE_DEV -m state --state NEW -j DMZHOLES
233 fi
234
235 # XTACCESS chain, used for external access
236 /sbin/iptables -N XTACCESS
237 /sbin/iptables -A INPUT -m state --state NEW -j XTACCESS
238
239 # PORTFWACCESS chain, used for portforwarding
240 /sbin/iptables -N PORTFWACCESS
241 /sbin/iptables -A FORWARD -m state --state NEW -j PORTFWACCESS
242
243 # Custom prerouting chains (for transparent proxy and port forwarding)
244 /sbin/iptables -t nat -N SQUID
245 /sbin/iptables -t nat -A PREROUTING -j SQUID
246 /sbin/iptables -t nat -N PORTFW
247 /sbin/iptables -t nat -A PREROUTING -j PORTFW
248
7e7495b3
MT
249 # upnp chain for our upnp daemon
250 /sbin/iptables -t nat -N UPNPFW
251 /sbin/iptables -t nat -A PREROUTING -j UPNPFW
252
3a1019f6
MT
253
254 # Custom mangle chain (for port fowarding)
255 /sbin/iptables -t mangle -N PORTFWMANGLE
256 /sbin/iptables -t mangle -A PREROUTING -j PORTFWMANGLE
257
258 # Postrouting rules (for port forwarding)
259 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT \
260 --to-source $GREEN_ADDRESS
261 if [ "$BLUE_DEV" != "" ]; then
262 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
263 fi
264 if [ "$ORANGE_DEV" != "" ]; then
265 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
266 fi
267
3a1019f6
MT
268 # run local firewall configuration, if present
269 if [ -x /etc/sysconfig/firewall.local ]; then
270 /etc/sysconfig/firewall.local start
271 fi
272
273 # last rule in input and forward chain is for logging.
5595bc03
CS
274
275 if [ "$DROPINPUT" == "on" ]; then
97fe1741 276 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
5595bc03 277 fi
97fe1741 278 /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
5595bc03 279 if [ "$DROPOUTPUT" == "on" ]; then
97fe1741 280 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
5595bc03 281 fi
97fe1741 282 /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
3a1019f6 283 ;;
13211b21
CS
284 startovpn)
285 # run openvpn
286 /usr/local/bin/openvpnctrl --create-chains-and-rules
287 ;;
3a1019f6
MT
288 stop)
289 iptables_init
290 # Accept everyting connected
291 /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
292
293 # localhost and ethernet.
294 /sbin/iptables -A INPUT -i lo -j ACCEPT
295 /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT
296
297 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
298 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
299 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
300 fi
301 if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "DHCP" ]; then
302 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
303 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
304 fi
305
3a1019f6
MT
306 # run local firewall configuration, if present
307 if [ -x /etc/sysconfig/firewall.local ]; then
308 /etc/sysconfig/firewall.local stop
309 fi
310
5595bc03 311 if [ "$DROPINPUT" == "on" ]; then
97fe1741 312 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
5595bc03 313 fi
97fe1741 314 /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
5595bc03 315 if [ "$DROPOUTPUT" == "on" ]; then
97fe1741 316 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
5595bc03 317 fi
97fe1741 318 /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
3a1019f6 319 ;;
13211b21
CS
320 stopovpn)
321 # stop openvpn
322 /usr/local/bin/openvpnctrl --delete-chains-and-rules
323 ;;
3a1019f6
MT
324 reload)
325 iptables_red
326
327 # run local firewall configuration, if present
328 if [ -x /etc/sysconfig/firewall.local ]; then
329 /etc/sysconfig/firewall.local reload
330 fi
331 ;;
332 restart)
333 $0 stop
334 $0 start
335 ;;
336 *)
337 echo "Usage: $0 {start|stop|reload|restart}"
338 exit 1
339 ;;
340esac
341
342exit 0