firewall: rules.pl: Refactored entire script.
[people/teissler/ipfire-2.x.git] / src / initscripts / init.d / firewall
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1#!/bin/sh
2
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3. /etc/sysconfig/rc
4. ${rc_functions}
5
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6eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
7eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
fe0cd647 8eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
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9IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
10
11if [ -f /var/ipfire/red/device ]; then
12 DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
13fi
14
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15function iptables() {
16 /sbin/iptables --wait "$@"
17}
18
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19iptables_init() {
20 # Flush all rules and delete all custom chains
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21 iptables -F
22 iptables -t nat -F
23 iptables -t mangle -F
24 iptables -X
25 iptables -t nat -X
26 iptables -t mangle -X
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27
28 # Set up policies
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29 iptables -P INPUT DROP
30 iptables -P FORWARD DROP
31 iptables -P OUTPUT ACCEPT
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32
33 # Empty LOG_DROP and LOG_REJECT chains
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34 iptables -N LOG_DROP
35 iptables -A LOG_DROP -m limit --limit 10/minute -j LOG
36 iptables -A LOG_DROP -j DROP
37 iptables -N LOG_REJECT
38 iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
39 iptables -A LOG_REJECT -j REJECT
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40
41 # This chain will log, then DROPs packets with certain bad combinations
42 # of flags might indicate a port-scan attempt (xmas, null, etc)
c581b670 43 iptables -N PSCAN
5595bc03 44 if [ "$DROPPORTSCAN" == "on" ]; then
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45 iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
46 iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
47 iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
48 iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
5595bc03 49 fi
c581b670 50 iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
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51
52 # New tcp packets without SYN set - could well be an obscure type of port scan
53 # that's not covered above, may just be a broken windows machine
c581b670 54 iptables -N NEWNOTSYN
5595bc03 55 if [ "$DROPNEWNOTSYN" == "on" ]; then
c581b670 56 iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN "
5595bc03 57 fi
c581b670 58 iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
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59
60 # Chain to contain all the rules relating to bad TCP flags
c581b670 61 iptables -N BADTCP
3a1019f6 62
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63 # Don't check loopback
64 iptables -A BADTCP -i lo -j RETURN
d8158ca6 65
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66 # Disallow packets frequently used by port-scanners
67 # nmap xmas
c581b670 68 iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
3a1019f6 69 # Null
c581b670 70 iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
3a1019f6 71 # FIN
c581b670 72 iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
3a1019f6 73 # SYN/RST (also catches xmas variants that set SYN+RST+...)
c581b670 74 iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
3a1019f6 75 # SYN/FIN (QueSO or nmap OS probe)
c581b670 76 iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
3a1019f6 77 # NEW TCP without SYN
c581b670 78 iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
b85d2a98 79
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80 iptables -A INPUT -p tcp -j BADTCP
81 iptables -A FORWARD -p tcp -j BADTCP
c0359d6d 82
b85d2a98 83 # Connection tracking chain
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84 iptables -N CONNTRACK
85 iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
3a1019f6 86
3a1019f6 87 # Fix for braindead ISP's
c581b670 88 iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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89
90 # CUSTOM chains, can be used by the users themselves
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91 iptables -N CUSTOMINPUT
92 iptables -A INPUT -j CUSTOMINPUT
93 iptables -N CUSTOMFORWARD
94 iptables -A FORWARD -j CUSTOMFORWARD
95 iptables -N CUSTOMOUTPUT
96 iptables -A OUTPUT -j CUSTOMOUTPUT
97 iptables -t nat -N CUSTOMPREROUTING
98 iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
99 iptables -t nat -N CUSTOMPOSTROUTING
100 iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
3a1019f6 101
815eaff4 102 # Guardian (IPS) chains
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103 iptables -N GUARDIAN
104 iptables -A INPUT -j GUARDIAN
105 iptables -A FORWARD -j GUARDIAN
815eaff4 106
1e555330 107 # Block OpenVPN transfer networks
c581b670 108 iptables -N OVPNBLOCK
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109 iptables -A INPUT -i tun+ -j OVPNBLOCK
110 iptables -A OUTPUT -o tun+ -j OVPNBLOCK
111 iptables -A FORWARD -i tun+ -j OVPNBLOCK
112 iptables -A FORWARD -o tun+ -j OVPNBLOCK
1e555330 113
51ab1de1 114 # OpenVPN transfer network translation
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115 iptables -t nat -N OVPNNAT
116 iptables -t nat -A POSTROUTING -j OVPNNAT
51ab1de1 117
daa1ceba 118 # IPTV chains for IGMPPROXY
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119 iptables -N IPTVINPUT
120 iptables -A INPUT -j IPTVINPUT
121 iptables -N IPTVFORWARD
122 iptables -A FORWARD -j IPTVFORWARD
daa1ceba 123
3a1019f6 124 # filtering from GUI
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125 iptables -N GUIINPUT
126 iptables -A INPUT -j GUIINPUT
127 iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
3a1019f6 128
afc611d4 129 # Accept everything on loopback
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130 iptables -N LOOPBACK
131 iptables -A LOOPBACK -i lo -j ACCEPT
132 iptables -A LOOPBACK -o lo -j ACCEPT
afc611d4 133
3b9a23ce 134 # Filter all packets with loopback addresses on non-loopback interfaces.
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135 iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
136 iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
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137
138 for i in INPUT FORWARD OUTPUT; do
c581b670 139 iptables -A ${i} -j LOOPBACK
3b9a23ce 140 done
afc611d4 141
3a1019f6 142 # Accept everything connected
b85d2a98 143 for i in INPUT FORWARD OUTPUT; do
c581b670 144 iptables -A ${i} -j CONNTRACK
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145 done
146
5fd30232 147 # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
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148 iptables -N IPSECINPUT
149 iptables -N IPSECFORWARD
150 iptables -N IPSECOUTPUT
151 iptables -A INPUT -j IPSECINPUT
152 iptables -A FORWARD -j IPSECFORWARD
153 iptables -A OUTPUT -j IPSECOUTPUT
154 iptables -t nat -N IPSECNAT
155 iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14 156
3a1019f6 157 # localhost and ethernet.
c581b670 158 iptables -A INPUT -i $GREEN_DEV -m conntrack --ctstate NEW -j ACCEPT ! -p icmp
218b3341 159
3a1019f6 160 # allow DHCP on BLUE to be turned on/off
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161 iptables -N DHCPBLUEINPUT
162 iptables -A INPUT -j DHCPBLUEINPUT
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163
164 # WIRELESS chains
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165 iptables -N WIRELESSINPUT
166 iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
167 iptables -N WIRELESSFORWARD
168 iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
987b75bc 169
ab4876ad 170 # OpenVPN
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171 iptables -N OVPNINPUT
172 iptables -A INPUT -j OVPNINPUT
ab4876ad 173
987b75bc 174 # TOR
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175 iptables -N TOR_INPUT
176 iptables -A INPUT -j TOR_INPUT
12dcfbbd 177
d5f1422d 178 # Jump into the actual firewall ruleset.
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179 iptables -N INPUTFW
180 iptables -A INPUT -j INPUTFW
d5f1422d 181
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182 iptables -N OUTGOINGFW
183 iptables -A OUTPUT -j OUTGOINGFW
d5f1422d 184
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185 iptables -N FORWARDFW
186 iptables -A FORWARD -j FORWARDFW
d5f1422d 187
fac38614 188 # SNAT rules
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189 iptables -t nat -N NAT_SOURCE
190 iptables -t nat -A POSTROUTING -j NAT_SOURCE
fac38614 191
3a1019f6 192 # RED chain, used for the red interface
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193 iptables -N REDINPUT
194 iptables -A INPUT -j REDINPUT
195 iptables -N REDFORWARD
196 iptables -A FORWARD -j REDFORWARD
197 iptables -t nat -N REDNAT
198 iptables -t nat -A POSTROUTING -j REDNAT
3a1019f6 199
bb12dd7b 200 # Custom prerouting chains (for transparent proxy)
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201 iptables -t nat -N SQUID
202 iptables -t nat -A PREROUTING -j SQUID
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203
204 # DNAT rules
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205 iptables -t nat -N NAT_DESTINATION
206 iptables -t nat -A PREROUTING -j NAT_DESTINATION
bb12dd7b 207
7e7495b3 208 # upnp chain for our upnp daemon
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209 iptables -t nat -N UPNPFW
210 iptables -t nat -A PREROUTING -j UPNPFW
211 iptables -N UPNPFW
212 iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
3a1019f6 213
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214 # Apply OpenVPN firewall rules
215 /usr/local/bin/openvpnctrl --firewall-rules
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216
217 # run wirelessctrl
218 /usr/local/bin/wirelessctrl
219
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220 # POLICY CHAIN
221 iptables -N POLICYIN
222 iptables -A INPUT -j POLICYIN
223 iptables -N POLICYFWD
224 iptables -A FORWARD -j POLICYFWD
225 iptables -N POLICYOUT
226 iptables -A OUTPUT -j POLICYOUT
b324de14 227
bb383423 228 # Initialize firewall policies.
5d7faa45 229 /usr/sbin/firewall-policy
690b0bd7 230
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231 # Install firewall rules for the red interface.
232 iptables_red
ff4770c7 233}
3a1019f6 234
ff4770c7 235iptables_red() {
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236 iptables -F REDINPUT
237 iptables -F REDFORWARD
238 iptables -t nat -F REDNAT
3a1019f6 239
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240 # PPPoE / PPTP Device
241 if [ "$IFACE" != "" ]; then
242 # PPPoE / PPTP
243 if [ "$DEVICE" != "" ]; then
c581b670 244 iptables -A REDINPUT -i $DEVICE -j ACCEPT
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245 fi
246 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
247 if [ "$RED_DEV" != "" ]; then
c581b670 248 iptables -A REDINPUT -i $RED_DEV -j ACCEPT
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249 fi
250 fi
3a1019f6 251 fi
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252
253 # PPTP over DHCP
254 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
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255 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
256 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
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257 fi
258
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259 # Orange pinholes
260 if [ "$ORANGE_DEV" != "" ]; then
261 # This rule enables a host on ORANGE network to connect to the outside
262 # (only if we have a red connection)
263 if [ "$IFACE" != "" ]; then
c581b670 264 iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
ff4770c7 265 fi
3a1019f6 266 fi
c400fe4c 267
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268 if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
269 # DHCP
270 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
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271 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
272 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
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273 fi
274 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
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275 iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
276 iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
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277 fi
278
279 # Outgoing masquerading (don't masqerade IPSEC (mark 50))
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280 iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
281 iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
c400fe4c 282
6be0579b 283 fi
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284
285 # Reload all rules.
55a5bcae 286 /usr/local/bin/firewallctrl
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287}
288
289# See how we were called.
290case "$1" in
291 start)
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292 boot_mesg "Loading firewall modules into the kernel"
293 modprobe iptable_nat || failed=1
294 for i in $(find /lib/modules/$(uname -r) -name nf_conntrack*); do
295 modprobe $(basename $i | cut -d. -f1) || failed=1
296 done
297 for i in $(find /lib/modules/$(uname -r) -name nf_nat*); do
298 modprobe $(basename $i | cut -d. -f1) || failed=1
299 done
300 (exit ${failed})
301 evaluate_retval
302
303 if [ -e /var/ipfire/main/disable_nf_sip ]; then
304 rmmod nf_nat_sip
305 rmmod nf_conntrack_sip
306 rmmod nf_nat_h323
307 rmmod nf_conntrack_h323
308 fi
309
7d7740a4 310 boot_mesg "Setting up firewall"
ff4770c7 311 iptables_init
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312 evaluate_retval
313
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314 # run local firewall configuration, if present
315 if [ -x /etc/sysconfig/firewall.local ]; then
316 /etc/sysconfig/firewall.local start
317 fi
6be0579b 318 ;;
3a1019f6 319 reload)
7d7740a4 320 boot_mesg "Reloading firewall"
3a1019f6 321 iptables_red
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322 evaluate_retval
323
3a1019f6 324 # run local firewall configuration, if present
ff4770c7 325 if [ -x /etc/sysconfig/firewall.local ]; then
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326 /etc/sysconfig/firewall.local reload
327 fi
328 ;;
329 restart)
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330 # run local firewall configuration, if present
331 if [ -x /etc/sysconfig/firewall.local ]; then
332 /etc/sysconfig/firewall.local stop
333 fi
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334 $0 start
335 ;;
336 *)
ff4770c7 337 echo "Usage: $0 {start|reload|restart}"
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338 exit 1
339 ;;
340esac
341
342exit 0