]>
git.ipfire.org Git - people/pmueller/ipfire-2.x.git/blob - src/initscripts/init.d/firewall
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'`
7 if [ -f /var
/ipfire
/red
/device
]; then
8 DEVICE
=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
12 # Flush all rules and delete all custom chains
14 /sbin
/iptables
-t nat
-F
15 /sbin
/iptables
-t mangle
-F
17 /sbin
/iptables
-t nat
-X
18 /sbin
/iptables
-t mangle
-X
21 /sbin
/iptables
-P INPUT DROP
22 /sbin
/iptables
-P FORWARD DROP
23 /sbin
/iptables
-P OUTPUT ACCEPT
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
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
36 /sbin
/iptables
-A PSCAN
-p tcp
-m limit
--limit 10/minute
-j LOG
--log-prefix "TCP Scan? "
37 /sbin
/iptables
-A PSCAN
-p udp
-m limit
--limit 10/minute
-j LOG
--log-prefix "UDP Scan? "
38 /sbin
/iptables
-A PSCAN
-p icmp
-m limit
--limit 10/minute
-j LOG
--log-prefix "ICMP Scan? "
39 /sbin
/iptables
-A PSCAN
-f -m limit
--limit 10/minute
-j LOG
--log-prefix "FRAG Scan? "
40 /sbin
/iptables
-A PSCAN
-j DROP
42 # New tcp packets without SYN set - could well be an obscure type of port scan
43 # that's not covered above, may just be a broken windows machine
44 /sbin
/iptables
-N NEWNOTSYN
45 /sbin
/iptables
-A NEWNOTSYN
-m limit
--limit 10/minute
-j LOG
--log-prefix "NEW not SYN? "
46 /sbin
/iptables
-A NEWNOTSYN
-j DROP
48 # Chain to contain all the rules relating to bad TCP flags
49 /sbin
/iptables
-N BADTCP
51 # Disallow packets frequently used by port-scanners
53 /sbin
/iptables
-A BADTCP
-p tcp
--tcp-flags ALL FIN
,URG
,PSH
-j PSCAN
55 /sbin
/iptables
-A BADTCP
-p tcp
--tcp-flags ALL NONE
-j PSCAN
57 /sbin
/iptables
-A BADTCP
-p tcp
--tcp-flags ALL FIN
-j PSCAN
58 # SYN/RST (also catches xmas variants that set SYN+RST+...)
59 /sbin
/iptables
-A BADTCP
-p tcp
--tcp-flags SYN
,RST SYN
,RST
-j PSCAN
60 # SYN/FIN (QueSO or nmap OS probe)
61 /sbin
/iptables
-A BADTCP
-p tcp
--tcp-flags SYN
,FIN SYN
,FIN
-j PSCAN
63 /sbin
/iptables
-A BADTCP
-p tcp
! --syn -m state
--state NEW
-j NEWNOTSYN
65 /sbin
/iptables
-A INPUT
-j BADTCP
66 /sbin
/iptables
-A FORWARD
-j BADTCP
71 /sbin
/iptables
-F REDINPUT
72 /sbin
/iptables
-F REDFORWARD
73 /sbin
/iptables
-t nat
-F REDNAT
76 if [ "$IFACE" != "" ]; then
78 if [ "$DEVICE" != "" ]; then
79 /sbin
/iptables
-A REDINPUT
-i $DEVICE -j ACCEPT
81 if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
82 if [ "$RED_DEV" != "" ]; then
83 /sbin
/iptables
-A REDINPUT
-i $RED_DEV -j ACCEPT
89 if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
90 /sbin
/iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
91 /sbin
/iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
95 if [ "$ORANGE_DEV" != "" ]; then
96 # This rule enables a host on ORANGE network to connect to the outside
97 # (only if we have a red connection)
98 if [ "$IFACE" != "" ]; then
99 /sbin
/iptables
-A REDFORWARD
-i $ORANGE_DEV -p tcp
-o $IFACE -j ACCEPT
100 /sbin
/iptables
-A REDFORWARD
-i $ORANGE_DEV -p udp
-o $IFACE -j ACCEPT
104 if [ "$IFACE" != "" -a -f /var
/ipfire
/red
/active
]; then
106 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
107 /sbin
/iptables
-A REDINPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
108 /sbin
/iptables
-A REDINPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
110 if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; 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
115 # Outgoing masquerading
116 /sbin
/iptables
-t nat
-A REDNAT
-o $IFACE -j MASQUERADE
121 # See how we were called.
126 # Limit Packets- helps reduce dos/syn attacks
127 # original do nothing line
128 #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit --limit 10/sec
129 # the correct one, but the negative '!' do nothing...
130 #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit ! --limit 10/sec -j DROP
132 # Fix for braindead ISP's
133 /sbin
/iptables
-A FORWARD
-p tcp
--tcp-flags SYN
,RST SYN
-j TCPMSS
--clamp-mss-to-pmtu
135 # CUSTOM chains, can be used by the users themselves
136 /sbin
/iptables
-N CUSTOMINPUT
137 /sbin
/iptables
-A INPUT
-j CUSTOMINPUT
138 /sbin
/iptables
-N CUSTOMFORWARD
139 /sbin
/iptables
-A FORWARD
-j CUSTOMFORWARD
140 /sbin
/iptables
-N CUSTOMOUTPUT
141 /sbin
/iptables
-A OUTPUT
-j CUSTOMOUTPUT
142 /sbin
/iptables
-t nat
-N CUSTOMPREROUTING
143 /sbin
/iptables
-t nat
-A PREROUTING
-j CUSTOMPREROUTING
144 /sbin
/iptables
-t nat
-N CUSTOMPOSTROUTING
145 /sbin
/iptables
-t nat
-A POSTROUTING
-j CUSTOMPOSTROUTING
148 /sbin
/iptables
-N GUIINPUT
149 /sbin
/iptables
-A INPUT
-j GUIINPUT
151 # Accept everything connected
152 /sbin
/iptables
-A INPUT
-m state
--state ESTABLISHED
,RELATED
-j ACCEPT
153 /sbin
/iptables
-A FORWARD
-m state
--state ESTABLISHED
,RELATED
-j ACCEPT
155 # localhost and ethernet.
156 /sbin
/iptables
-A INPUT
-i lo
-m state
--state NEW
-j ACCEPT
157 /sbin
/iptables
-A INPUT
-s 127.0.0.0/8 -m state
--state NEW
-j DROP
# Loopback not on lo
158 /sbin
/iptables
-A INPUT
-d 127.0.0.0/8 -m state
--state NEW
-j DROP
159 /sbin
/iptables
-A FORWARD
-i lo
-m state
--state NEW
-j ACCEPT
160 /sbin
/iptables
-A FORWARD
-s 127.0.0.0/8 -m state
--state NEW
-j DROP
161 /sbin
/iptables
-A FORWARD
-d 127.0.0.0/8 -m state
--state NEW
-j DROP
162 /sbin
/iptables
-A INPUT
-i $GREEN_DEV -m state
--state NEW
-j ACCEPT
-p ! icmp
163 /sbin
/iptables
-A FORWARD
-i $GREEN_DEV -m state
--state NEW
-j ACCEPT
165 # If a host on orange tries to initiate a connection to IPFire's red IP and
166 # the connection gets DNATed back through a port forward to a server on orange
167 # we end up with orange -> orange traffic passing through IPFire
168 [ "$ORANGE_DEV" != "" ] && /sbin
/iptables
-A FORWARD
-i $ORANGE_DEV -o $ORANGE_DEV -m state
--state NEW
-j ACCEPT
170 # accept all traffic from ipsec interfaces
171 /sbin
/iptables
-A INPUT
-i ipsec
+ -j ACCEPT
172 /sbin
/iptables
-A FORWARD
-i ipsec
+ -j ACCEPT
174 # allow DHCP on BLUE to be turned on/off
175 /sbin
/iptables
-N DHCPBLUEINPUT
176 /sbin
/iptables
-A INPUT
-j DHCPBLUEINPUT
179 /sbin
/iptables
-N IPSECRED
180 /sbin
/iptables
-A INPUT
-j IPSECRED
181 /sbin
/iptables
-N IPSECBLUE
182 /sbin
/iptables
-A INPUT
-j IPSECBLUE
185 /sbin
/iptables
-N WIRELESSINPUT
186 /sbin
/iptables
-A INPUT
-m state
--state NEW
-j WIRELESSINPUT
187 /sbin
/iptables
-N WIRELESSFORWARD
188 /sbin
/iptables
-A FORWARD
-m state
--state NEW
-j WIRELESSFORWARD
190 # RED chain, used for the red interface
191 /sbin
/iptables
-N REDINPUT
192 /sbin
/iptables
-A INPUT
-j REDINPUT
193 /sbin
/iptables
-N REDFORWARD
194 /sbin
/iptables
-A FORWARD
-j REDFORWARD
195 /sbin
/iptables
-t nat
-N REDNAT
196 /sbin
/iptables
-t nat
-A POSTROUTING
-j REDNAT
200 # DMZ pinhole chain. setdmzholes setuid prog adds rules here to allow
201 # ORANGE to talk to GREEN / BLUE.
202 /sbin
/iptables
-N DMZHOLES
203 if [ "$ORANGE_DEV" != "" ]; then
204 /sbin
/iptables
-A FORWARD
-i $ORANGE_DEV -m state
--state NEW
-j DMZHOLES
207 # XTACCESS chain, used for external access
208 /sbin
/iptables
-N XTACCESS
209 /sbin
/iptables
-A INPUT
-m state
--state NEW
-j XTACCESS
211 # PORTFWACCESS chain, used for portforwarding
212 /sbin
/iptables
-N PORTFWACCESS
213 /sbin
/iptables
-A FORWARD
-m state
--state NEW
-j PORTFWACCESS
215 # Custom prerouting chains (for transparent proxy and port forwarding)
216 /sbin
/iptables
-t nat
-N SQUID
217 /sbin
/iptables
-t nat
-A PREROUTING
-j SQUID
218 /sbin
/iptables
-t nat
-N PORTFW
219 /sbin
/iptables
-t nat
-A PREROUTING
-j PORTFW
222 # Custom mangle chain (for port fowarding)
223 /sbin
/iptables
-t mangle
-N PORTFWMANGLE
224 /sbin
/iptables
-t mangle
-A PREROUTING
-j PORTFWMANGLE
226 # Postrouting rules (for port forwarding)
227 /sbin
/iptables
-t nat
-A POSTROUTING
-m mark
--mark 1 -j SNAT \
228 --to-source $GREEN_ADDRESS
229 if [ "$BLUE_DEV" != "" ]; then
230 /sbin
/iptables
-t nat
-A POSTROUTING
-m mark
--mark 2 -j SNAT
--to-source $BLUE_ADDRESS
232 if [ "$ORANGE_DEV" != "" ]; then
233 /sbin
/iptables
-t nat
-A POSTROUTING
-m mark
--mark 3 -j SNAT
--to-source $ORANGE_ADDRESS
237 /usr
/local
/bin
/openvpnctrl
--create-chains-and-rules
239 # run local firewall configuration, if present
240 if [ -x /etc
/sysconfig
/firewall.
local ]; then
241 /etc
/sysconfig
/firewall.
local start
244 # last rule in input and forward chain is for logging.
245 /sbin
/iptables
-A INPUT
-m limit
--limit 10/minute
-j LOG
--log-prefix "INPUT "
246 /sbin
/iptables
-A FORWARD
-m limit
--limit 10/minute
-j LOG
--log-prefix "OUTPUT "
250 # Accept everyting connected
251 /sbin
/iptables
-A INPUT
-m state
--state ESTABLISHED
,RELATED
-j ACCEPT
253 # localhost and ethernet.
254 /sbin
/iptables
-A INPUT
-i lo
-j ACCEPT
255 /sbin
/iptables
-A INPUT
-i $GREEN_DEV -m state
--state NEW
-j ACCEPT
257 if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
258 /sbin
/iptables
-A INPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
259 /sbin
/iptables
-A INPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
261 if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "DHCP" ]; then
262 /sbin
/iptables
-A INPUT
-p tcp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
263 /sbin
/iptables
-A INPUT
-p udp
--source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
267 /usr
/local
/bin
/openvpnctrl
--delete-chains-and-rules
269 # run local firewall configuration, if present
270 if [ -x /etc
/sysconfig
/firewall.
local ]; then
271 /etc
/sysconfig
/firewall.
local stop
274 /sbin
/iptables
-A INPUT
-m limit
--limit 10/minute
-j LOG
--log-prefix "INPUT "
275 /sbin
/iptables
-A FORWARD
-m limit
--limit 10/minute
-j LOG
--log-prefix "OUTPUT "
280 # run local firewall configuration, if present
281 if [ -x /etc
/sysconfig
/firewall.
local ]; then
282 /etc
/sysconfig
/firewall.
local reload
290 echo "Usage: $0 {start|stop|reload|restart}"