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Commit | Line | Data |
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3a1019f6 MT |
1 | #!/bin/sh |
2 | ||
3 | eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings) | |
4 | eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings) | |
5 | IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'` | |
6 | ||
7 | if [ -f /var/ipfire/red/device ]; then | |
8 | DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'` | |
9 | fi | |
10 | ||
11 | iptables_init() { | |
12 | # Flush all rules and delete all custom chains | |
13 | /sbin/iptables -F | |
14 | /sbin/iptables -t nat -F | |
15 | /sbin/iptables -t mangle -F | |
16 | /sbin/iptables -X | |
17 | /sbin/iptables -t nat -X | |
18 | /sbin/iptables -t mangle -X | |
19 | ||
20 | # Set up policies | |
21 | /sbin/iptables -P INPUT DROP | |
22 | /sbin/iptables -P FORWARD DROP | |
23 | /sbin/iptables -P OUTPUT ACCEPT | |
24 | ||
25 | # Empty LOG_DROP and LOG_REJECT chains | |
26 | /sbin/iptables -N LOG_DROP | |
27 | /sbin/iptables -A LOG_DROP -m limit --limit 10/minute -j LOG | |
28 | /sbin/iptables -A LOG_DROP -j DROP | |
29 | /sbin/iptables -N LOG_REJECT | |
30 | /sbin/iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG | |
31 | /sbin/iptables -A LOG_REJECT -j REJECT | |
32 | ||
33 | # This chain will log, then DROPs packets with certain bad combinations | |
34 | # of flags might indicate a port-scan attempt (xmas, null, etc) | |
35 | /sbin/iptables -N PSCAN | |
5595bc03 | 36 | if [ "$DROPPORTSCAN" == "on" ]; then |
97fe1741 CS |
37 | /sbin/iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan" |
38 | /sbin/iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UPD PScan" | |
39 | /sbin/iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan" | |
40 | /sbin/iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan" | |
5595bc03 | 41 | fi |
97fe1741 | 42 | /sbin/iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan" |
3a1019f6 MT |
43 | |
44 | # New tcp packets without SYN set - could well be an obscure type of port scan | |
45 | # that's not covered above, may just be a broken windows machine | |
46 | /sbin/iptables -N NEWNOTSYN | |
5595bc03 | 47 | if [ "$DROPNEWNOTSYN" == "on" ]; then |
97fe1741 | 48 | /sbin/iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN " |
5595bc03 | 49 | fi |
97fe1741 | 50 | /sbin/iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN" |
3a1019f6 MT |
51 | |
52 | # Chain to contain all the rules relating to bad TCP flags | |
53 | /sbin/iptables -N BADTCP | |
54 | ||
55 | # Disallow packets frequently used by port-scanners | |
56 | # nmap xmas | |
57 | /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN | |
58 | # Null | |
59 | /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN | |
60 | # FIN | |
61 | /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN | |
62 | # SYN/RST (also catches xmas variants that set SYN+RST+...) | |
63 | /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN | |
64 | # SYN/FIN (QueSO or nmap OS probe) | |
65 | /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN | |
66 | # NEW TCP without SYN | |
67 | /sbin/iptables -A BADTCP -p tcp ! --syn -m state --state NEW -j NEWNOTSYN | |
68 | ||
69 | /sbin/iptables -A INPUT -j BADTCP | |
70 | /sbin/iptables -A FORWARD -j BADTCP | |
71 | ||
72 | } | |
73 | ||
74 | iptables_red() { | |
75 | /sbin/iptables -F REDINPUT | |
76 | /sbin/iptables -F REDFORWARD | |
77 | /sbin/iptables -t nat -F REDNAT | |
78 | ||
79 | # PPPoE / PPTP Device | |
80 | if [ "$IFACE" != "" ]; then | |
81 | # PPPoE / PPTP | |
82 | if [ "$DEVICE" != "" ]; then | |
83 | /sbin/iptables -A REDINPUT -i $DEVICE -j ACCEPT | |
84 | fi | |
85 | if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then | |
86 | if [ "$RED_DEV" != "" ]; then | |
87 | /sbin/iptables -A REDINPUT -i $RED_DEV -j ACCEPT | |
88 | fi | |
89 | fi | |
90 | fi | |
91 | ||
92 | # PPTP over DHCP | |
93 | if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then | |
94 | /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT | |
95 | /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT | |
96 | fi | |
97 | ||
98 | # Orange pinholes | |
99 | if [ "$ORANGE_DEV" != "" ]; then | |
100 | # This rule enables a host on ORANGE network to connect to the outside | |
101 | # (only if we have a red connection) | |
102 | if [ "$IFACE" != "" ]; then | |
103 | /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -p tcp -o $IFACE -j ACCEPT | |
104 | /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -p udp -o $IFACE -j ACCEPT | |
105 | fi | |
106 | fi | |
107 | ||
108 | if [ "$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 | ||
119 | # Outgoing masquerading | |
120 | /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE | |
121 | ||
122 | fi | |
123 | } | |
124 | ||
125 | # See how we were called. | |
126 | case "$1" in | |
127 | start) | |
128 | iptables_init | |
129 | ||
130 | # Limit Packets- helps reduce dos/syn attacks | |
131 | # original do nothing line | |
132 | #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit --limit 10/sec | |
133 | # the correct one, but the negative '!' do nothing... | |
134 | #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit ! --limit 10/sec -j DROP | |
135 | ||
136 | # Fix for braindead ISP's | |
137 | /sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu | |
138 | ||
139 | # CUSTOM chains, can be used by the users themselves | |
140 | /sbin/iptables -N CUSTOMINPUT | |
141 | /sbin/iptables -A INPUT -j CUSTOMINPUT | |
142 | /sbin/iptables -N CUSTOMFORWARD | |
143 | /sbin/iptables -A FORWARD -j CUSTOMFORWARD | |
144 | /sbin/iptables -N CUSTOMOUTPUT | |
145 | /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT | |
4cb74dce MT |
146 | /sbin/iptables -N OUTGOINGFW |
147 | /sbin/iptables -A OUTPUT -j OUTGOINGFW | |
3a1019f6 MT |
148 | /sbin/iptables -t nat -N CUSTOMPREROUTING |
149 | /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING | |
150 | /sbin/iptables -t nat -N CUSTOMPOSTROUTING | |
151 | /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING | |
152 | ||
153 | # filtering from GUI | |
154 | /sbin/iptables -N GUIINPUT | |
155 | /sbin/iptables -A INPUT -j GUIINPUT | |
905fbf3e | 156 | /sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT |
3a1019f6 MT |
157 | |
158 | # Accept everything connected | |
159 | /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT | |
160 | /sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT | |
5fd30232 MT |
161 | |
162 | # trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything | |
163 | /sbin/iptables -N IPSECVIRTUAL | |
164 | /sbin/iptables -N OPENSSLVIRTUAL | |
5595bc03 CS |
165 | /sbin/iptables -A INPUT -j IPSECVIRTUAL -m comment --comment "IPSECVIRTUAL INPUT" |
166 | /sbin/iptables -A INPUT -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL INPUT" | |
167 | /sbin/iptables -A FORWARD -j IPSECVIRTUAL -m comment --comment "IPSECVIRTUAL FORWARD" | |
168 | /sbin/iptables -A FORWARD -j OPENSSLVIRTUAL -m comment --comment "OPENSSLVIRTUAL FORWARD" | |
4cb74dce MT |
169 | |
170 | # Outgoing Firewall | |
171 | /sbin/iptables -A FORWARD -j OUTGOINGFW | |
3a1019f6 MT |
172 | |
173 | # localhost and ethernet. | |
174 | /sbin/iptables -A INPUT -i lo -m state --state NEW -j ACCEPT | |
175 | /sbin/iptables -A INPUT -s 127.0.0.0/8 -m state --state NEW -j DROP # Loopback not on lo | |
176 | /sbin/iptables -A INPUT -d 127.0.0.0/8 -m state --state NEW -j DROP | |
177 | /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT | |
178 | /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP | |
179 | /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP | |
180 | /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT -p ! icmp | |
181 | /sbin/iptables -A FORWARD -i $GREEN_DEV -m state --state NEW -j ACCEPT | |
182 | ||
183 | # If a host on orange tries to initiate a connection to IPFire's red IP and | |
184 | # the connection gets DNATed back through a port forward to a server on orange | |
185 | # we end up with orange -> orange traffic passing through IPFire | |
186 | [ "$ORANGE_DEV" != "" ] && /sbin/iptables -A FORWARD -i $ORANGE_DEV -o $ORANGE_DEV -m state --state NEW -j ACCEPT | |
187 | ||
3a1019f6 MT |
188 | # allow DHCP on BLUE to be turned on/off |
189 | /sbin/iptables -N DHCPBLUEINPUT | |
190 | /sbin/iptables -A INPUT -j DHCPBLUEINPUT | |
191 | ||
5fd30232 MT |
192 | # IPSec |
193 | /sbin/iptables -N IPSECPHYSICAL | |
194 | /sbin/iptables -A INPUT -j IPSECPHYSICAL | |
195 | ||
196 | # OPenSSL | |
197 | /sbin/iptables -N OPENSSLPHYSICAL | |
198 | /sbin/iptables -A INPUT -j OPENSSLPHYSICAL | |
3a1019f6 MT |
199 | |
200 | # WIRELESS chains | |
201 | /sbin/iptables -N WIRELESSINPUT | |
202 | /sbin/iptables -A INPUT -m state --state NEW -j WIRELESSINPUT | |
203 | /sbin/iptables -N WIRELESSFORWARD | |
204 | /sbin/iptables -A FORWARD -m state --state NEW -j WIRELESSFORWARD | |
205 | ||
206 | # RED chain, used for the red interface | |
207 | /sbin/iptables -N REDINPUT | |
208 | /sbin/iptables -A INPUT -j REDINPUT | |
209 | /sbin/iptables -N REDFORWARD | |
210 | /sbin/iptables -A FORWARD -j REDFORWARD | |
211 | /sbin/iptables -t nat -N REDNAT | |
212 | /sbin/iptables -t nat -A POSTROUTING -j REDNAT | |
213 | ||
214 | iptables_red | |
215 | ||
216 | # DMZ pinhole chain. setdmzholes setuid prog adds rules here to allow | |
217 | # ORANGE to talk to GREEN / BLUE. | |
218 | /sbin/iptables -N DMZHOLES | |
219 | if [ "$ORANGE_DEV" != "" ]; then | |
220 | /sbin/iptables -A FORWARD -i $ORANGE_DEV -m state --state NEW -j DMZHOLES | |
221 | fi | |
222 | ||
223 | # XTACCESS chain, used for external access | |
224 | /sbin/iptables -N XTACCESS | |
225 | /sbin/iptables -A INPUT -m state --state NEW -j XTACCESS | |
226 | ||
227 | # PORTFWACCESS chain, used for portforwarding | |
228 | /sbin/iptables -N PORTFWACCESS | |
229 | /sbin/iptables -A FORWARD -m state --state NEW -j PORTFWACCESS | |
230 | ||
231 | # Custom prerouting chains (for transparent proxy and port forwarding) | |
232 | /sbin/iptables -t nat -N SQUID | |
233 | /sbin/iptables -t nat -A PREROUTING -j SQUID | |
234 | /sbin/iptables -t nat -N PORTFW | |
235 | /sbin/iptables -t nat -A PREROUTING -j PORTFW | |
236 | ||
7e7495b3 MT |
237 | # upnp chain for our upnp daemon |
238 | /sbin/iptables -t nat -N UPNPFW | |
239 | /sbin/iptables -t nat -A PREROUTING -j UPNPFW | |
240 | ||
3a1019f6 MT |
241 | |
242 | # Custom mangle chain (for port fowarding) | |
243 | /sbin/iptables -t mangle -N PORTFWMANGLE | |
244 | /sbin/iptables -t mangle -A PREROUTING -j PORTFWMANGLE | |
245 | ||
246 | # Postrouting rules (for port forwarding) | |
247 | /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT \ | |
248 | --to-source $GREEN_ADDRESS | |
249 | if [ "$BLUE_DEV" != "" ]; then | |
250 | /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS | |
251 | fi | |
252 | if [ "$ORANGE_DEV" != "" ]; then | |
253 | /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS | |
254 | fi | |
255 | ||
3a1019f6 MT |
256 | # run local firewall configuration, if present |
257 | if [ -x /etc/sysconfig/firewall.local ]; then | |
258 | /etc/sysconfig/firewall.local start | |
259 | fi | |
260 | ||
261 | # last rule in input and forward chain is for logging. | |
5595bc03 CS |
262 | |
263 | if [ "$DROPINPUT" == "on" ]; then | |
97fe1741 | 264 | /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT " |
5595bc03 | 265 | fi |
97fe1741 | 266 | /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT" |
5595bc03 | 267 | if [ "$DROPOUTPUT" == "on" ]; then |
97fe1741 | 268 | /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT " |
5595bc03 | 269 | fi |
97fe1741 | 270 | /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT" |
3a1019f6 | 271 | ;; |
13211b21 CS |
272 | startovpn) |
273 | # run openvpn | |
274 | /usr/local/bin/openvpnctrl --create-chains-and-rules | |
275 | ;; | |
3a1019f6 MT |
276 | stop) |
277 | iptables_init | |
278 | # Accept everyting connected | |
279 | /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT | |
280 | ||
281 | # localhost and ethernet. | |
282 | /sbin/iptables -A INPUT -i lo -j ACCEPT | |
283 | /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT | |
284 | ||
285 | if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then | |
286 | /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT | |
287 | /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT | |
288 | fi | |
289 | if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "DHCP" ]; then | |
290 | /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT | |
291 | /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT | |
292 | fi | |
293 | ||
3a1019f6 MT |
294 | # run local firewall configuration, if present |
295 | if [ -x /etc/sysconfig/firewall.local ]; then | |
296 | /etc/sysconfig/firewall.local stop | |
297 | fi | |
298 | ||
5595bc03 | 299 | if [ "$DROPINPUT" == "on" ]; then |
97fe1741 | 300 | /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT " |
5595bc03 | 301 | fi |
97fe1741 | 302 | /sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT" |
5595bc03 | 303 | if [ "$DROPOUTPUT" == "on" ]; then |
97fe1741 | 304 | /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_OUTPUT " |
5595bc03 | 305 | fi |
97fe1741 | 306 | /sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_OUTPUT" |
3a1019f6 | 307 | ;; |
13211b21 CS |
308 | stopovpn) |
309 | # stop openvpn | |
310 | /usr/local/bin/openvpnctrl --delete-chains-and-rules | |
311 | ;; | |
3a1019f6 MT |
312 | reload) |
313 | iptables_red | |
314 | ||
315 | # run local firewall configuration, if present | |
316 | if [ -x /etc/sysconfig/firewall.local ]; then | |
317 | /etc/sysconfig/firewall.local reload | |
318 | fi | |
319 | ;; | |
320 | restart) | |
321 | $0 stop | |
322 | $0 start | |
323 | ;; | |
324 | *) | |
325 | echo "Usage: $0 {start|stop|reload|restart}" | |
326 | exit 1 | |
327 | ;; | |
328 | esac | |
329 | ||
330 | exit 0 |