firewall: Initialize basic ruleset before entering runlevel 3.
[people/teissler/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 $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
6 IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
7
8 if [ -f /var/ipfire/red/device ]; then
9 DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
10 fi
11
12 function iptables() {
13 /sbin/iptables --wait "$@"
14 }
15
16 iptables_init() {
17 # Flush all rules and delete all custom chains
18 iptables -F
19 iptables -t nat -F
20 iptables -t mangle -F
21 iptables -X
22 iptables -t nat -X
23 iptables -t mangle -X
24
25 # Set up policies
26 iptables -P INPUT DROP
27 iptables -P FORWARD DROP
28 iptables -P OUTPUT ACCEPT
29
30 # Empty LOG_DROP and LOG_REJECT chains
31 iptables -N LOG_DROP
32 iptables -A LOG_DROP -m limit --limit 10/minute -j LOG
33 iptables -A LOG_DROP -j DROP
34 iptables -N LOG_REJECT
35 iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
36 iptables -A LOG_REJECT -j REJECT
37
38 # This chain will log, then DROPs packets with certain bad combinations
39 # of flags might indicate a port-scan attempt (xmas, null, etc)
40 iptables -N PSCAN
41 if [ "$DROPPORTSCAN" == "on" ]; then
42 iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
43 iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
44 iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
45 iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
46 fi
47 iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
48
49 # New tcp packets without SYN set - could well be an obscure type of port scan
50 # that's not covered above, may just be a broken windows machine
51 iptables -N NEWNOTSYN
52 if [ "$DROPNEWNOTSYN" == "on" ]; then
53 iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN "
54 fi
55 iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
56
57 # Chain to contain all the rules relating to bad TCP flags
58 iptables -N BADTCP
59
60 # Don't check loopback
61 iptables -A BADTCP -i lo -j RETURN
62
63 # Disallow packets frequently used by port-scanners
64 # nmap xmas
65 iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
66 # Null
67 iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
68 # FIN
69 iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
70 # SYN/RST (also catches xmas variants that set SYN+RST+...)
71 iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
72 # SYN/FIN (QueSO or nmap OS probe)
73 iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
74 # NEW TCP without SYN
75 iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
76
77 iptables -A INPUT -p tcp -j BADTCP
78 iptables -A FORWARD -p tcp -j BADTCP
79
80 # Connection tracking chain
81 iptables -N CONNTRACK
82 iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
83
84 # Fix for braindead ISP's
85 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
86
87 # CUSTOM chains, can be used by the users themselves
88 iptables -N CUSTOMINPUT
89 iptables -A INPUT -j CUSTOMINPUT
90 iptables -N CUSTOMFORWARD
91 iptables -A FORWARD -j CUSTOMFORWARD
92 iptables -N CUSTOMOUTPUT
93 iptables -A OUTPUT -j CUSTOMOUTPUT
94 iptables -t nat -N CUSTOMPREROUTING
95 iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
96 iptables -t nat -N CUSTOMPOSTROUTING
97 iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
98
99 # Guardian (IPS) chains
100 iptables -N GUARDIAN
101 iptables -A INPUT -j GUARDIAN
102 iptables -A FORWARD -j GUARDIAN
103
104 # Block OpenVPN transfer networks
105 iptables -N OVPNBLOCK
106 for i in INPUT FORWARD; do
107 iptables -A ${i} -j OVPNBLOCK
108 done
109
110 # OpenVPN transfer network translation
111 iptables -t nat -N OVPNNAT
112 iptables -t nat -A POSTROUTING -j OVPNNAT
113
114 # IPTV chains for IGMPPROXY
115 iptables -N IPTVINPUT
116 iptables -A INPUT -j IPTVINPUT
117 iptables -N IPTVFORWARD
118 iptables -A FORWARD -j IPTVFORWARD
119
120 # filtering from GUI
121 iptables -N GUIINPUT
122 iptables -A INPUT -j GUIINPUT
123 iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
124
125 # Accept everything on loopback
126 iptables -N LOOPBACK
127 iptables -A LOOPBACK -i lo -j ACCEPT
128 iptables -A LOOPBACK -o lo -j ACCEPT
129
130 # Filter all packets with loopback addresses on non-loopback interfaces.
131 iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
132 iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
133
134 for i in INPUT FORWARD OUTPUT; do
135 iptables -A ${i} -j LOOPBACK
136 done
137
138 # Accept everything connected
139 for i in INPUT FORWARD OUTPUT; do
140 iptables -A ${i} -j CONNTRACK
141 done
142
143 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
144 iptables -N IPSECINPUT
145 iptables -N IPSECFORWARD
146 iptables -N IPSECOUTPUT
147 iptables -A INPUT -j IPSECINPUT
148 iptables -A FORWARD -j IPSECFORWARD
149 iptables -A OUTPUT -j IPSECOUTPUT
150 iptables -t nat -N IPSECNAT
151 iptables -t nat -A POSTROUTING -j IPSECNAT
152
153 # localhost and ethernet.
154 iptables -A INPUT -i $GREEN_DEV -m conntrack --ctstate NEW -j ACCEPT ! -p icmp
155
156 # allow DHCP on BLUE to be turned on/off
157 iptables -N DHCPBLUEINPUT
158 iptables -A INPUT -j DHCPBLUEINPUT
159
160 # WIRELESS chains
161 iptables -N WIRELESSINPUT
162 iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
163 iptables -N WIRELESSFORWARD
164 iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
165
166 # OpenVPN
167 iptables -N OVPNINPUT
168 iptables -A INPUT -j OVPNINPUT
169
170 # TOR
171 iptables -N TOR_INPUT
172 iptables -A INPUT -j TOR_INPUT
173
174 # Jump into the actual firewall ruleset.
175 iptables -N INPUTFW
176 iptables -A INPUT -j INPUTFW
177
178 iptables -N OUTGOINGFW
179 iptables -A OUTPUT -j OUTGOINGFW
180
181 iptables -N FORWARDFW
182 iptables -A FORWARD -j FORWARDFW
183
184 # SNAT rules
185 iptables -t nat -N NAT_SOURCE
186 iptables -t nat -A POSTROUTING -j NAT_SOURCE
187
188 # RED chain, used for the red interface
189 iptables -N REDINPUT
190 iptables -A INPUT -j REDINPUT
191 iptables -N REDFORWARD
192 iptables -A FORWARD -j REDFORWARD
193 iptables -t nat -N REDNAT
194 iptables -t nat -A POSTROUTING -j REDNAT
195
196 iptables_red
197
198 # Custom prerouting chains (for transparent proxy)
199 iptables -t nat -N SQUID
200 iptables -t nat -A PREROUTING -j SQUID
201
202 # DNAT rules
203 iptables -t nat -N NAT_DESTINATION
204 iptables -t nat -A PREROUTING -j NAT_DESTINATION
205
206 # upnp chain for our upnp daemon
207 iptables -t nat -N UPNPFW
208 iptables -t nat -A PREROUTING -j UPNPFW
209 iptables -N UPNPFW
210 iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
211
212 # Apply OpenVPN firewall rules
213 /usr/local/bin/openvpnctrl --firewall-rules
214
215 # run wirelessctrl
216 /usr/local/bin/wirelessctrl
217
218 # POLICY CHAIN
219 iptables -N POLICYIN
220 iptables -A INPUT -j POLICYIN
221 iptables -N POLICYFWD
222 iptables -A FORWARD -j POLICYFWD
223 iptables -N POLICYOUT
224 iptables -A OUTPUT -j POLICYOUT
225
226 /usr/sbin/firewall-policy
227
228 # read new firewall
229 /usr/local/bin/firewallctrl
230
231 if [ "$DROPINPUT" == "on" ]; then
232 iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT"
233 fi
234 iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
235 if [ "$DROPFORWARD" == "on" ]; then
236 iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD"
237 fi
238 iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
239 }
240
241 iptables_red() {
242 iptables -F REDINPUT
243 iptables -F REDFORWARD
244 iptables -t nat -F REDNAT
245
246 # PPPoE / PPTP Device
247 if [ "$IFACE" != "" ]; then
248 # PPPoE / PPTP
249 if [ "$DEVICE" != "" ]; then
250 iptables -A REDINPUT -i $DEVICE -j ACCEPT
251 fi
252 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
253 if [ "$RED_DEV" != "" ]; then
254 iptables -A REDINPUT -i $RED_DEV -j ACCEPT
255 fi
256 fi
257 fi
258
259 # PPTP over DHCP
260 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
261 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
262 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
263 fi
264
265 # Orange pinholes
266 if [ "$ORANGE_DEV" != "" ]; then
267 # This rule enables a host on ORANGE network to connect to the outside
268 # (only if we have a red connection)
269 if [ "$IFACE" != "" ]; then
270 iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
271 fi
272 fi
273
274 if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
275 # DHCP
276 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
277 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
278 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
279 fi
280 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
281 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
282 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
283 fi
284
285 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
286 iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
287 iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
288
289 fi
290 }
291
292 # See how we were called.
293 case "$1" in
294 start)
295 boot_mesg "Setting up firewall"
296 iptables_init
297 evaluate_retval
298
299 # run local firewall configuration, if present
300 if [ -x /etc/sysconfig/firewall.local ]; then
301 /etc/sysconfig/firewall.local start
302 fi
303 ;;
304 reload)
305 boot_mesg "Reloading firewall"
306 iptables_red
307 evaluate_retval
308
309 # run local firewall configuration, if present
310 if [ -x /etc/sysconfig/firewall.local ]; then
311 /etc/sysconfig/firewall.local reload
312 fi
313 ;;
314 restart)
315 # run local firewall configuration, if present
316 if [ -x /etc/sysconfig/firewall.local ]; then
317 /etc/sysconfig/firewall.local stop
318 fi
319 $0 start
320 ;;
321 *)
322 echo "Usage: $0 {start|reload|restart}"
323 exit 1
324 ;;
325 esac
326
327 exit 0