Fix outgoing firewall problems with MAC rules.
[ipfire-2.x.git] / src / initscripts / init.d / firewall
CommitLineData
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1#!/bin/sh
2
3eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
4eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
fe0cd647 5eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
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6IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
7
8if [ -f /var/ipfire/red/device ]; then
9 DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
10fi
11
12iptables_init() {
13 # Flush all rules and delete all custom chains
14 /sbin/iptables -F
15 /sbin/iptables -t nat -F
16 /sbin/iptables -t mangle -F
17 /sbin/iptables -X
18 /sbin/iptables -t nat -X
19 /sbin/iptables -t mangle -X
20
21 # Set up policies
22 /sbin/iptables -P INPUT DROP
23 /sbin/iptables -P FORWARD DROP
24 /sbin/iptables -P OUTPUT ACCEPT
25
26 # Empty LOG_DROP and LOG_REJECT chains
27 /sbin/iptables -N LOG_DROP
28 /sbin/iptables -A LOG_DROP -m limit --limit 10/minute -j LOG
29 /sbin/iptables -A LOG_DROP -j DROP
30 /sbin/iptables -N LOG_REJECT
31 /sbin/iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
32 /sbin/iptables -A LOG_REJECT -j REJECT
33
34 # This chain will log, then DROPs packets with certain bad combinations
35 # of flags might indicate a port-scan attempt (xmas, null, etc)
36 /sbin/iptables -N PSCAN
5595bc03 37 if [ "$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"
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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"
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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 [ "$DROPNEWNOTSYN" == "on" ]; then
97fe1741 49 /sbin/iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN "
5595bc03 50 fi
97fe1741 51 /sbin/iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
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52
53 # Chain to contain all the rules relating to bad TCP flags
54 /sbin/iptables -N BADTCP
55
d8158ca6 56 #Don't check loopback
a56df4ee 57 /sbin/iptables -A BADTCP -i lo -j RETURN
d8158ca6 58
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59 # Disallow packets frequently used by port-scanners
60 # nmap xmas
61 /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
62 # Null
63 /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
64 # FIN
65 /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
66 # SYN/RST (also catches xmas variants that set SYN+RST+...)
67 /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
68 # SYN/FIN (QueSO or nmap OS probe)
69 /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
70 # NEW TCP without SYN
71 /sbin/iptables -A BADTCP -p tcp ! --syn -m state --state NEW -j NEWNOTSYN
72
73 /sbin/iptables -A INPUT -j BADTCP
74 /sbin/iptables -A FORWARD -j BADTCP
75
76}
77
78iptables_red() {
79 /sbin/iptables -F REDINPUT
80 /sbin/iptables -F REDFORWARD
81 /sbin/iptables -t nat -F REDNAT
82
83 # PPPoE / PPTP Device
84 if [ "$IFACE" != "" ]; then
85 # PPPoE / PPTP
86 if [ "$DEVICE" != "" ]; then
87 /sbin/iptables -A REDINPUT -i $DEVICE -j ACCEPT
88 fi
89 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
90 if [ "$RED_DEV" != "" ]; then
91 /sbin/iptables -A REDINPUT -i $RED_DEV -j ACCEPT
92 fi
93 fi
94 fi
95
96 # PPTP over DHCP
97 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
98 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
99 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
100 fi
101
102 # Orange pinholes
103 if [ "$ORANGE_DEV" != "" ]; then
104 # This rule enables a host on ORANGE network to connect to the outside
105 # (only if we have a red connection)
106 if [ "$IFACE" != "" ]; then
139a9b4f 107 /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
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108 fi
109 fi
110
111 if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
112 # DHCP
113 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
114 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
115 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
116 fi
117 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
118 /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
119 /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
120 fi
121
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122 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
123 /sbin/iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
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124 /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
125
126 fi
127}
128
129# See how we were called.
130case "$1" in
131 start)
132 iptables_init
133
134 # Limit Packets- helps reduce dos/syn attacks
135 # original do nothing line
136 #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit --limit 10/sec
137 # the correct one, but the negative '!' do nothing...
9efdd899 138 #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN ! -m limit --limit 10/sec -j DROP
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139
140 # Fix for braindead ISP's
141 /sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
142
143 # CUSTOM chains, can be used by the users themselves
144 /sbin/iptables -N CUSTOMINPUT
145 /sbin/iptables -A INPUT -j CUSTOMINPUT
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146 /sbin/iptables -N GUARDIAN
147 /sbin/iptables -A INPUT -j GUARDIAN
148 /sbin/iptables -A FORWARD -j GUARDIAN
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149 /sbin/iptables -N CUSTOMFORWARD
150 /sbin/iptables -A FORWARD -j CUSTOMFORWARD
151 /sbin/iptables -N CUSTOMOUTPUT
152 /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
4cb74dce 153 /sbin/iptables -N OUTGOINGFW
d9716b06 154 /sbin/iptables -N OUTGOINGFWMAC
4cb74dce 155 /sbin/iptables -A OUTPUT -j OUTGOINGFW
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156 /sbin/iptables -t nat -N CUSTOMPREROUTING
157 /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
158 /sbin/iptables -t nat -N CUSTOMPOSTROUTING
159 /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
160
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161 # IPTV chains for IGMPPROXY
162 /sbin/iptables -N IPTVINPUT
163 /sbin/iptables -A INPUT -j IPTVINPUT
164 /sbin/iptables -N IPTVFORWARD
165 /sbin/iptables -A FORWARD -j IPTVFORWARD
166
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167 # filtering from GUI
168 /sbin/iptables -N GUIINPUT
169 /sbin/iptables -A INPUT -j GUIINPUT
905fbf3e 170 /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
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171
172 # Accept everything connected
173 /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
174 /sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
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175
176 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
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177 /sbin/iptables -N IPSECINPUT
178 /sbin/iptables -N IPSECFORWARD
179 /sbin/iptables -N IPSECOUTPUT
5fd30232 180 /sbin/iptables -N OPENSSLVIRTUAL
6652626c 181 /sbin/iptables -A INPUT -j IPSECINPUT
5595bc03 182 /sbin/iptables -A INPUT -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL INPUT"
6652626c 183 /sbin/iptables -A FORWARD -j IPSECFORWARD
5595bc03 184 /sbin/iptables -A FORWARD -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL FORWARD"
6652626c 185 /sbin/iptables -A OUTPUT -j IPSECOUTPUT
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186 /sbin/iptables -t nat -N IPSECNAT
187 /sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14 188
4cb74dce 189 # Outgoing Firewall
d9716b06 190 /sbin/iptables -A FORWARD -j OUTGOINGFWMAC
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191
192 # localhost and ethernet.
d8158ca6 193 /sbin/iptables -A INPUT -i lo -m state --state NEW -j ACCEPT
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194 /sbin/iptables -A INPUT -s 127.0.0.0/8 -m state --state NEW -j DROP # Loopback not on lo
195 /sbin/iptables -A INPUT -d 127.0.0.0/8 -m state --state NEW -j DROP
cae0079c 196 /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT
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197 /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP
198 /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP
dd79c399 199 /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT ! -p icmp
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200 /sbin/iptables -A FORWARD -i $GREEN_DEV -m state --state NEW -j ACCEPT
201
202 # If a host on orange tries to initiate a connection to IPFire's red IP and
203 # the connection gets DNATed back through a port forward to a server on orange
204 # we end up with orange -> orange traffic passing through IPFire
205 [ "$ORANGE_DEV" != "" ] && /sbin/iptables -A FORWARD -i $ORANGE_DEV -o $ORANGE_DEV -m state --state NEW -j ACCEPT
206
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207 # allow DHCP on BLUE to be turned on/off
208 /sbin/iptables -N DHCPBLUEINPUT
209 /sbin/iptables -A INPUT -j DHCPBLUEINPUT
210
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211 # OPenSSL
212 /sbin/iptables -N OPENSSLPHYSICAL
213 /sbin/iptables -A INPUT -j OPENSSLPHYSICAL
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214
215 # WIRELESS chains
216 /sbin/iptables -N WIRELESSINPUT
217 /sbin/iptables -A INPUT -m state --state NEW -j WIRELESSINPUT
218 /sbin/iptables -N WIRELESSFORWARD
219 /sbin/iptables -A FORWARD -m state --state NEW -j WIRELESSFORWARD
220
221 # RED chain, used for the red interface
222 /sbin/iptables -N REDINPUT
223 /sbin/iptables -A INPUT -j REDINPUT
224 /sbin/iptables -N REDFORWARD
225 /sbin/iptables -A FORWARD -j REDFORWARD
226 /sbin/iptables -t nat -N REDNAT
227 /sbin/iptables -t nat -A POSTROUTING -j REDNAT
228
229 iptables_red
230
231 # DMZ pinhole chain. setdmzholes setuid prog adds rules here to allow
232 # ORANGE to talk to GREEN / BLUE.
233 /sbin/iptables -N DMZHOLES
234 if [ "$ORANGE_DEV" != "" ]; then
235 /sbin/iptables -A FORWARD -i $ORANGE_DEV -m state --state NEW -j DMZHOLES
236 fi
237
238 # XTACCESS chain, used for external access
239 /sbin/iptables -N XTACCESS
240 /sbin/iptables -A INPUT -m state --state NEW -j XTACCESS
241
242 # PORTFWACCESS chain, used for portforwarding
243 /sbin/iptables -N PORTFWACCESS
244 /sbin/iptables -A FORWARD -m state --state NEW -j PORTFWACCESS
245
246 # Custom prerouting chains (for transparent proxy and port forwarding)
247 /sbin/iptables -t nat -N SQUID
248 /sbin/iptables -t nat -A PREROUTING -j SQUID
249 /sbin/iptables -t nat -N PORTFW
250 /sbin/iptables -t nat -A PREROUTING -j PORTFW
251
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252 # upnp chain for our upnp daemon
253 /sbin/iptables -t nat -N UPNPFW
254 /sbin/iptables -t nat -A PREROUTING -j UPNPFW
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255 # This chain only contains dummy rules.
256 /sbin/iptables -N UPNPFW
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257
258 # Custom mangle chain (for port fowarding)
259 /sbin/iptables -t mangle -N PORTFWMANGLE
260 /sbin/iptables -t mangle -A PREROUTING -j PORTFWMANGLE
261
262 # Postrouting rules (for port forwarding)
263 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT \
264 --to-source $GREEN_ADDRESS
265 if [ "$BLUE_DEV" != "" ]; then
266 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
267 fi
268 if [ "$ORANGE_DEV" != "" ]; then
269 /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
270 fi
271
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272 # run local firewall configuration, if present
273 if [ -x /etc/sysconfig/firewall.local ]; then
274 /etc/sysconfig/firewall.local start
275 fi
276
277 # last rule in input and forward chain is for logging.
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278
279 if [ "$DROPINPUT" == "on" ]; then
97fe1741 280 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
5595bc03 281 fi
97fe1741 282 /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
5595bc03 283 if [ "$DROPOUTPUT" == "on" ]; then
97fe1741 284 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
5595bc03 285 fi
97fe1741 286 /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
3a1019f6 287 ;;
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288 startovpn)
289 # run openvpn
290 /usr/local/bin/openvpnctrl --create-chains-and-rules
291 ;;
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292 stop)
293 iptables_init
294 # Accept everyting connected
295 /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
296
297 # localhost and ethernet.
298 /sbin/iptables -A INPUT -i lo -j ACCEPT
299 /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT
300
301 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "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 $IFACE -j ACCEPT
304 fi
305 if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "DHCP" ]; then
306 /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
307 /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
308 fi
309
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310 # run local firewall configuration, if present
311 if [ -x /etc/sysconfig/firewall.local ]; then
312 /etc/sysconfig/firewall.local stop
313 fi
314
5595bc03 315 if [ "$DROPINPUT" == "on" ]; then
97fe1741 316 /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT "
5595bc03 317 fi
97fe1741 318 /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
5595bc03 319 if [ "$DROPOUTPUT" == "on" ]; then
97fe1741 320 /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT "
5595bc03 321 fi
97fe1741 322 /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT"
3a1019f6 323 ;;
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324 stopovpn)
325 # stop openvpn
326 /usr/local/bin/openvpnctrl --delete-chains-and-rules
327 ;;
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328 reload)
329 iptables_red
330
331 # run local firewall configuration, if present
332 if [ -x /etc/sysconfig/firewall.local ]; then
333 /etc/sysconfig/firewall.local reload
334 fi
335 ;;
336 restart)
337 $0 stop
338 $0 start
339 ;;
340 *)
341 echo "Usage: $0 {start|stop|reload|restart}"
342 exit 1
343 ;;
344esac
345
346exit 0