[firewall] / local.m4

### -*-sh-*-
###
### Local firewall configuration
###
### (c) 2008 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### This program is free software; you can redistribute it and/or modify
### it under the terms of the GNU General Public License as published by
### the Free Software Foundation; either version 2 of the License, or
### (at your option) any later version.
###
### This program is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
### GNU General Public License for more details.
###
### You should have received a copy of the GNU General Public License
### along with this program; if not, write to the Free Software Foundation,
### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

###--------------------------------------------------------------------------
### Local configuration.

m4_divert(6)m4_dnl
## Default NTP servers.
defconf(ntp_servers,
	"158.152.1.76 158.152.1.204 194.159.253.2 195.173.57.232")

m4_divert(-1)
###--------------------------------------------------------------------------
### Packet classification.

## IPv4 addressing.
##
## There are two small blocks of publicly routable IPv4 addresses, and a
## block of RFC1918 private-use addresses allocated from the Cambridge G-RIN.
## The former are as follows.
##
## 62.49.204.144/28
##		House border network (dmz).  We have all of these, but .145
##		is reserved for the router.
##
## 212.13.18.64/28
##		Jump colocated network (jump).  .65--68 are used by Jump
##		network infrastructure; we get the rest.
##
## The latter is the block 172.29.196.0/22.  Currently the low half is
## unallocated (and may be returned to the G-RIN); the remaining addresses
## are allocated as follows.
##
## 172.29.198.0/24  Untrusted networks.
##	.0/25		house wireless net
##	.128/28		iodine (IP-over-DNS) network
##
## 172.29.199.0/24  Trusted networks.
##	.0/25		house wired network
##	.128/27		mobile VPN hosts
##	.160/28		reserved, except .160/30 allocated for ITS
##	.176/28		internal colocated network
##	.192/27		house safe network
##	.224/27		anycast services

## IPv6 addressing.
##
## There are five blocks of publicly routable IPv6 addresses, though some of
## them aren't very interesting.  The ranges are as follows.
##
## 2001:470:1f08:1b98::/64
##		Hurricane Electric tunnel network: only :1 (HE) and :2
##		(radius) are used.
##
## 2001:470:1f09:1b98::/64
##		House border network (dmz).
##
## 2001:470:9740::/48
##		Main house range.  See below for allocation policy.
##
## 2001:ba8:0:1d9::/64
##		Jump border network (jump): :1 is the router (supplied by
##		Jump); other addresses are ours.
##
## 2001:ba8:1d9::/48
##		Main colocated range.  See below for allocation policy.
##
## Addresses in the /64 networks are simply allocated in ascending order.
## The /48s are split into /64s by appending a 16-bit network number.  The
## top nibble of the network number classifies the network, as follows.
##
## 8xxx		Untrusted
## 6xxx		Virtual, safe
## 4xxx		Safe
## 0xxx		Unsafe, trusted
##
## These have been chosen so that network properties can be deduced by
## inspecting bits of the network number:
##
## Bit 15	If set, the network is untrusted; otherwise it is trusted.
## Bit 14	If set, the network is safe; otherwise it is unsafe.
##
## Finally, the low-order nibbles identify the site.
##
## 0		No specific site: mobile VPN endpoints or anycast addresses.
## 1		House.
## 2		Jump colocation.
##
## Usually site-0 networks are allocated from the Jump range to improve
## expected performance from/to external sites which don't engage in our
## dynamic routing protocols.

## Define the available network classes.
m4_divert(42)m4_dnl
defnetclass scary	scary 		trusted		    mcast
defnetclass untrusted	scary untrusted trusted		    mcast
defnetclass trusted	scary untrusted trusted safe noloop mcast
defnetclass safe			trusted safe noloop mcast
defnetclass noloop			trusted safe	    mcast

defnetclass link
defnetclass mcast
m4_divert(-1)

m4_divert(26)m4_dnl
###--------------------------------------------------------------------------
### Network layout.

## House networks.
defnet dmz trusted
	addr 62.49.204.144/28 2001:470:1f09:1b98::/64
	via unsafe untrusted
defnet unsafe trusted
	addr 172.29.199.0/25 2001:470:9740:1::/64
	via househub
defnet safe safe
	addr 172.29.199.192/27 2001:470:9740:4001::/64
	via househub
defnet untrusted untrusted
	addr 172.29.198.0/25 2001:470:9740:8001::/64
	via househub

defnet househub virtual
	via housebdry dmz unsafe safe untrusted
defnet housebdry virtual
	via househub hub

## House hosts.
defhost radius
	hosttype router
	iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default
	iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default
	iface eth2 dmz unsafe safe untrusted vpn sgo colobdry
	iface eth3 unsafe untrusted vpn default
	iface ppp0 default
	iface t6-he default
	iface vpn-precision colobdry vpn sgo
	iface vpn-chiark sgo
	iface vpn-+ vpn
defhost roadstar
	iface eth0 dmz unsafe
	iface eth1 dmz unsafe
defhost jem
	iface eth0 dmz unsafe
	iface eth1 dmz unsafe
defhost artist
	hosttype router
	iface eth0 dmz unsafe untrusted
	iface eth1 dmz unsafe untrusted
	iface eth3 unsafe untrusted
defhost vampire
	hosttype router
	iface eth0.4 dmz unsafe untrusted safe vpn sgo colobdry
	iface eth0.5 dmz unsafe untrusted safe vpn sgo colobdry
	iface eth0.6 dmz unsafe safe untrusted vpn sgo colobdry
	iface eth0.7 unsafe untrusted vpn
	iface vpn-precision colobdry vpn sgo
	iface vpn-chiark sgo
	iface vpn-+ vpn
defhost ibanez
	iface br-dmz dmz unsafe
	iface br-unsafe unsafe
defhost orange
	iface wlan0 untrusted
	iface vpn-radius unsafe
defhost groove
	iface eth0 unsafe
	iface wlan0 untrusted
	iface vpn-radius unsafe

defhost gibson
	hosttype client
	iface eth0.5 unsafe

## Colocated networks.
defnet jump trusted
	addr 212.13.198.64/28 2001:ba8:0:1d9::/64
	via colohub
defnet colo trusted
	addr 172.29.199.176/28 2001:ba8:1d9:2::/64
	via colohub
defnet colohub virtual
	via colobdry jump colo
defnet colobdry virtual
	via colohub hub
defnet iodine untrusted
	addr 172.29.198.128/28
	via colohub

## Colocated hosts.
defhost fender
	iface br-jump jump colo
	iface br-colo jump colo
defhost precision
	hosttype router
	iface eth0 jump colo vpn sgo
	iface eth1 jump colo vpn sgo
	iface vpn-mango binswood
	iface vpn-radius housebdry vpn sgo
	iface vpn-chiark sgo
	iface vpn-+ vpn
defhost telecaster
	iface eth0 jump colo
	iface eth1 jump colo
defhost stratocaster
	iface eth0 jump colo
	iface eth1 jump colo
defhost jazz
	hosttype router
	iface eth0 jump colo vpn
	iface eth1 jump colo vpn
	iface dns0 iodine
	iface vpn-+ vpn

## Other networks.
defnet hub virtual
	via housebdry colobdry
defnet sgo noloop
	addr !172.29.198.0/23
	addr 10.0.0.0/8
	addr 172.16.0.0/12
	addr 192.168.0.0/16
	via househub colohub
defnet vpn safe
	addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
	via househub colohub
	host crybaby 1 ::1:1
	host terror 2 ::2:1
	host orange 3 ::3:1
	host haze 4 ::4:1
	host groove 5 ::5:1
defnet anycast trusted
	addr 172.29.199.224/27 2001:ba8:1d9:0::/64
	via dmz unsafe safe untrusted jump colo vpn
defnet default scary
	addr 62.49.204.144/28 2001:470:1f09:1b98::/64
	addr 212.13.198.64/28 2001:ba8:0:1d9::/64
	addr 2001:ba8:1d9::/48 #temporary
	via dmz unsafe untrusted jump colo

## Satellite networks.
defnet binswood noloop
	addr 10.165.27.0/24
	via colohub

defhost mango
	hosttype router
	iface eth0 binswood default
	iface vpn-precision colo

m4_divert(80)m4_dnl
###--------------------------------------------------------------------------
### Connection tracking helper modules.

for i in ftp; do
  modprobe nf_conntrack_$i
done

m4_divert(80)m4_dnl
###--------------------------------------------------------------------------
### Special forwarding exemptions.

case $forward in
  1)

    ## Only allow these packets if they're not fragmented.  (Don't trust safe
    ## hosts's fragment reassembly to be robust against malicious fragments.)
    ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
    ## of `! -f', so we do the negation using early return from a subchain.
    clearchain fwd-spec-nofrag
    run iptables -A fwd-spec-nofrag -j RETURN --fragment
    run ip6tables -A fwd-spec-nofrag -j RETURN \
	    -m ipv6header --soft --header frag
    run ip46tables -A FORWARD -j fwd-spec-nofrag

    ## Allow ping from safe/noloop to untrusted networks.
    run iptables -A fwd-spec-nofrag -j ACCEPT \
	    -p icmp --icmp-type echo-request \
	    -m mark --mark $to_untrusted/$MASK_TO
    run iptables -A fwd-spec-nofrag -j ACCEPT \
	    -p icmp --icmp-type echo-reply \
	    -m mark --mark $from_untrusted/$MASK_FROM \
	    -m state --state ESTABLISHED
    run ip6tables -A fwd-spec-nofrag -j ACCEPT \
	    -p icmpv6 --icmpv6-type echo-request \
	    -m mark --mark $to_untrusted/$MASK_TO
    run ip6tables -A fwd-spec-nofrag -j ACCEPT \
	    -p icmpv6 --icmpv6-type echo-reply \
	    -m mark --mark $from_untrusted/$MASK_FROM \
	    -m state --state ESTABLISHED

    ## Allow SSH from safe/noloop to untrusted networks.
    run ip46tables -A fwd-spec-nofrag -j ACCEPT \
	    -p tcp --destination-port $port_ssh \
	    -m mark --mark $to_untrusted/$MASK_TO
    run ip46tables -A fwd-spec-nofrag -j ACCEPT \
	    -p tcp --source-port $port_ssh \
	    -m mark --mark $from_untrusted/$MASK_FROM \
	    -m state --state ESTABLISHED

    ;;
esac

m4_divert(80)m4_dnl
###--------------------------------------------------------------------------
### Kill things we don't understand properly.
###
### I don't like having to do this, but since I don't know how to do proper
### multicast filtering, I'm just going to ban it from being forwarded.

errorchain poorly-understood REJECT

## Ban multicast destination addresses in forwarding.
case $forward in
  1)
    run iptables -A FORWARD -g poorly-understood \
	    -d 224.0.0.0/4
    run ip6tables -A FORWARD -g poorly-understood \
	    -d ff::/8
    ;;
esac

m4_divert(84)m4_dnl
###--------------------------------------------------------------------------
### Locally-bound packet inspection.

clearchain inbound

## Track connections.
commonrules inbound
conntrack inbound

## Allow incoming bootp.  Bootp won't be forwarded, so this is obviously a
## local request.
run iptables -A inbound -j ACCEPT \
	-s 0.0.0.0 -d 255.255.255.255 \
	-p udp --source-port $port_bootpc --destination-port $port_bootps
run iptables -A inbound -j ACCEPT \
	-s 172.29.198.0/23 \
	-p udp --source-port $port_bootpc --destination-port $port_bootps

## Allow incoming ping.  This is the only ICMP left.
run ip46tables -A inbound -j ACCEPT -p icmp

m4_divert(88)m4_dnl
## Allow unusual things.
openports inbound

## Inspect inbound packets from untrusted sources.
run ip46tables -A inbound -j forbidden
run ip46tables -A INPUT -m mark --mark $from_scary/$MASK_FROM -g inbound
run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound

## Allow responses from the scary outside world into the untrusted net, but
## don't let untrusted things run services.
case $forward in
  1)
    run ip46tables -A FORWARD -j ACCEPT \
	-m mark --mark $(( $from_scary | $to_untrusted ))/$(( $MASK_FROM | $MASK_TO )) \
	-m state --state ESTABLISHED,RELATED
    ;;
esac

## Otherwise process as indicated by the mark.
for i in $inchains; do
  run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
done

m4_divert(-1)
###----- That's all, folks --------------------------------------------------
Commit	Line	Data
775bd287	1	### --sh--
bfdc045d MW	2	###
	3	### Local firewall configuration
	4	###
	5	### (c) 2008 Mark Wooding
	6	###
	7
	8	###----- Licensing notice ---------------------------------------------------
	9	###
	10	### This program is free software; you can redistribute it and/or modify
	11	### it under the terms of the GNU General Public License as published by
	12	### the Free Software Foundation; either version 2 of the License, or
	13	### (at your option) any later version.
	14	###
	15	### This program is distributed in the hope that it will be useful,
	16	### but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	### GNU General Public License for more details.
	19	###
	20	### You should have received a copy of the GNU General Public License
	21	### along with this program; if not, write to the Free Software Foundation,
	22	### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	23
	24	###--------------------------------------------------------------------------
335b2afe MW	25	### Local configuration.
	26
	27	m4_divert(6)m4_dnl
	28	## Default NTP servers.
	29	defconf(ntp_servers,
	30	"158.152.1.76 158.152.1.204 194.159.253.2 195.173.57.232")
	31
	32	m4_divert(-1)
	33	###--------------------------------------------------------------------------
bfdc045d MW	34	### Packet classification.
bfdc045d MW	35
36e36cc7 MW	36	## IPv4 addressing.
	37	##
	38	## There are two small blocks of publicly routable IPv4 addresses, and a
	39	## block of RFC1918 private-use addresses allocated from the Cambridge G-RIN.
	40	## The former are as follows.
	41	##
	42	## 62.49.204.144/28
	43	## House border network (dmz). We have all of these, but .145
	44	## is reserved for the router.
	45	##
	46	## 212.13.18.64/28
	47	## Jump colocated network (jump). .65--68 are used by Jump
	48	## network infrastructure; we get the rest.
	49	##
	50	## The latter is the block 172.29.196.0/22. Currently the low half is
	51	## unallocated (and may be returned to the G-RIN); the remaining addresses
	52	## are allocated as follows.
	53	##
	54	## 172.29.198.0/24 Untrusted networks.
	55	## .0/25 house wireless net
	56	## .128/28 iodine (IP-over-DNS) network
	57	##
	58	## 172.29.199.0/24 Trusted networks.
	59	## .0/25 house wired network
	60	## .128/27 mobile VPN hosts
	61	## .160/28 reserved, except .160/30 allocated for ITS
	62	## .176/28 internal colocated network
	63	## .192/27 house safe network
	64	## .224/27 anycast services
	65
	66	## IPv6 addressing.
	67	##
	68	## There are five blocks of publicly routable IPv6 addresses, though some of
	69	## them aren't very interesting. The ranges are as follows.
	70	##
	71	## 2001:470:1f08:1b98::/64
	72	## Hurricane Electric tunnel network: only :1 (HE) and :2
	73	## (radius) are used.
	74	##
	75	## 2001:470:1f09:1b98::/64
	76	## House border network (dmz).
	77	##
	78	## 2001:470:9740::/48
	79	## Main house range. See below for allocation policy.
	80	##
	81	## 2001:ba8:0:1d9::/64
	82	## Jump border network (jump): :1 is the router (supplied by
	83	## Jump); other addresses are ours.
	84	##
	85	## 2001:ba8:1d9::/48
	86	## Main colocated range. See below for allocation policy.
	87	##
	88	## Addresses in the /64 networks are simply allocated in ascending order.
	89	## The /48s are split into /64s by appending a 16-bit network number. The
	90	## top nibble of the network number classifies the network, as follows.
	91	##
	92	## 8xxx Untrusted
2caaca79	93	## 6xxx Virtual, safe
36e36cc7 MW	94	## 4xxx Safe
	95	## 0xxx Unsafe, trusted
	96	##
	97	## These have been chosen so that network properties can be deduced by
	98	## inspecting bits of the network number:
	99	##
	100	## Bit 15 If set, the network is untrusted; otherwise it is trusted.
	101	## Bit 14 If set, the network is safe; otherwise it is unsafe.
	102	##
	103	## Finally, the low-order nibbles identify the site.
	104	##
	105	## 0 No specific site: mobile VPN endpoints or anycast addresses.
	106	## 1 House.
	107	## 2 Jump colocation.
	108	##
	109	## Usually site-0 networks are allocated from the Jump range to improve
	110	## expected performance from/to external sites which don't engage in our
	111	## dynamic routing protocols.
	112
bfdc045d MW	113	## Define the available network classes.
bfdc045d MW	114	m4_divert(42)m4_dnl
1b534b6a MW	115	defnetclass scary scary trusted mcast
	116	defnetclass untrusted scary untrusted trusted mcast
	117	defnetclass trusted scary untrusted trusted safe noloop mcast
	118	defnetclass safe trusted safe noloop mcast
	119	defnetclass noloop trusted safe mcast
951e7943	120
44f95827 MW	121	defnetclass link
44f95827 MW	122	defnetclass mcast
a4d8cae3	123	m4_divert(-1)
bfdc045d	124
a4d8cae3	125	m4_divert(26)m4_dnl
bfdc045d MW	126	###--------------------------------------------------------------------------
	127	### Network layout.
	128
beb4f0ee MW	129	## House networks.
beb4f0ee MW	130	defnet dmz trusted
b9e891b5	131	addr 62.49.204.144/28 2001:470:1f09:1b98::/64
17a45245	132	via unsafe untrusted
beb4f0ee	133	defnet unsafe trusted
b9e891b5	134	addr 172.29.199.0/25 2001:470:9740:1::/64
17a45245	135	via househub
beb4f0ee	136	defnet safe safe
216285e1	137	addr 172.29.199.192/27 2001:470:9740:4001::/64
17a45245	138	via househub
beb4f0ee	139	defnet untrusted untrusted
b9e891b5	140	addr 172.29.198.0/25 2001:470:9740:8001::/64
17a45245	141	via househub
bfdc045d	142
beb4f0ee	143	defnet househub virtual
17a45245	144	via housebdry dmz unsafe safe untrusted
beb4f0ee	145	defnet housebdry virtual
17a45245	146	via househub hub
beb4f0ee MW	147
	148	## House hosts.
	149	defhost radius
4eb9f4df	150	hosttype router
68f0829f MW	151	iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default
68f0829f MW	152	iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default
960a9996	153	iface eth2 dmz unsafe safe untrusted vpn sgo colobdry
83cc1e6c	154	iface eth3 unsafe untrusted vpn default
8506ff83	155	iface ppp0 default
a7e48c06	156	iface t6-he default
68f0829f MW	157	iface vpn-precision colobdry vpn sgo
	158	iface vpn-chiark sgo
	159	iface vpn-+ vpn
beb4f0ee	160	defhost roadstar
ce6434f7 MW	161	iface eth0 dmz unsafe
ce6434f7 MW	162	iface eth1 dmz unsafe
beb4f0ee	163	defhost jem
ce6434f7 MW	164	iface eth0 dmz unsafe
ce6434f7 MW	165	iface eth1 dmz unsafe
beb4f0ee	166	defhost artist
564c6939	167	hosttype router
490003e4 MW	168	iface eth0 dmz unsafe untrusted
490003e4 MW	169	iface eth1 dmz unsafe untrusted
83cc1e6c	170	iface eth3 unsafe untrusted
beb4f0ee	171	defhost vampire
4eb9f4df	172	hosttype router
2b17ac87 MW	173	iface eth0.4 dmz unsafe untrusted safe vpn sgo colobdry
	174	iface eth0.5 dmz unsafe untrusted safe vpn sgo colobdry
	175	iface eth0.6 dmz unsafe safe untrusted vpn sgo colobdry
83cc1e6c	176	iface eth0.7 unsafe untrusted vpn
68f0829f	177	iface vpn-precision colobdry vpn sgo
ebaa31a7 MW	178	iface vpn-chiark sgo
ebaa31a7 MW	179	iface vpn-+ vpn
beb4f0ee	180	defhost ibanez
06ff8082	181	iface br-dmz dmz unsafe
beb4f0ee	182	iface br-unsafe unsafe
6fd217ae MW	183	defhost orange
	184	iface wlan0 untrusted
	185	iface vpn-radius unsafe
49b81a66 MW	186	defhost groove
49b81a66 MW	187	iface eth0 unsafe
24ddb007 MW	188	iface wlan0 untrusted
24ddb007 MW	189	iface vpn-radius unsafe
beb4f0ee MW	190
beb4f0ee MW	191	defhost gibson
4eb9f4df	192	hosttype client
15e9eeff	193	iface eth0.5 unsafe
beb4f0ee MW	194
	195	## Colocated networks.
	196	defnet jump trusted
b9e891b5	197	addr 212.13.198.64/28 2001:ba8:0:1d9::/64
17a45245	198	via colohub
beb4f0ee	199	defnet colo trusted
b9e891b5	200	addr 172.29.199.176/28 2001:ba8:1d9:2::/64
17a45245	201	via colohub
beb4f0ee	202	defnet colohub virtual
9853a66d	203	via colobdry jump colo
beb4f0ee	204	defnet colobdry virtual
17a45245	205	via colohub hub
148d527c MW	206	defnet iodine untrusted
148d527c MW	207	addr 172.29.198.128/28
17a45245	208	via colohub
beb4f0ee MW	209
	210	## Colocated hosts.
	211	defhost fender
ce6434f7 MW	212	iface br-jump jump colo
ce6434f7 MW	213	iface br-colo jump colo
beb4f0ee	214	defhost precision
4eb9f4df	215	hosttype router
560ae309 MW	216	iface eth0 jump colo vpn sgo
560ae309 MW	217	iface eth1 jump colo vpn sgo
1fd9cef9	218	iface vpn-mango binswood
68f0829f	219	iface vpn-radius housebdry vpn sgo
ebaa31a7 MW	220	iface vpn-chiark sgo
ebaa31a7 MW	221	iface vpn-+ vpn
beb4f0ee	222	defhost telecaster
ce6434f7 MW	223	iface eth0 jump colo
ce6434f7 MW	224	iface eth1 jump colo
beb4f0ee	225	defhost stratocaster
ce6434f7 MW	226	iface eth0 jump colo
ce6434f7 MW	227	iface eth1 jump colo
beb4f0ee	228	defhost jazz
560ae309 MW	229	hosttype router
	230	iface eth0 jump colo vpn
	231	iface eth1 jump colo vpn
148d527c	232	iface dns0 iodine
560ae309	233	iface vpn-+ vpn
beb4f0ee MW	234
	235	## Other networks.
	236	defnet hub virtual
17a45245	237	via housebdry colobdry
ebaa31a7 MW	238	defnet sgo noloop
	239	addr !172.29.198.0/23
	240	addr 10.0.0.0/8
	241	addr 172.16.0.0/12
	242	addr 192.168.0.0/16
17a45245	243	via househub colohub
7dff2754 MW	244	defnet vpn safe
7dff2754 MW	245	addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
17a45245	246	via househub colohub
eec061c0 MW	247	host crybaby 1 ::1:1
	248	host terror 2 ::2:1
	249	host orange 3 ::3:1
a28edce0	250	host haze 4 ::4:1
24ddb007	251	host groove 5 ::5:1
c68b8ecc MW	252	defnet anycast trusted
c68b8ecc MW	253	addr 172.29.199.224/27 2001:ba8:1d9:0::/64
17a45245	254	via dmz unsafe safe untrusted jump colo vpn
1b534b6a	255	defnet default scary
b9e891b5 MW	256	addr 62.49.204.144/28 2001:470:1f09:1b98::/64
	257	addr 212.13.198.64/28 2001:ba8:0:1d9::/64
	258	addr 2001:ba8:1d9::/48 #temporary
17a45245	259	via dmz unsafe untrusted jump colo
1ee6211d	260
1fd9cef9 MW	261	## Satellite networks.
	262	defnet binswood noloop
	263	addr 10.165.27.0/24
	264	via colohub
	265
31c0a107 MW	266	defhost mango
	267	hosttype router
	268	iface eth0 binswood default
	269	iface vpn-precision colo
	270
a4d8cae3	271	m4_divert(80)m4_dnl
bfdc045d	272	###--------------------------------------------------------------------------
5c5fcd73 MW	273	### Connection tracking helper modules.
	274
	275	for i in ftp; do
	276	modprobe nf_conntrack_$i
	277	done
	278
	279	m4_divert(80)m4_dnl
	280	###--------------------------------------------------------------------------
bfdc045d MW	281	### Special forwarding exemptions.
bfdc045d MW	282
78af294c MW	283	case $forward in
	284	1)
	285
	286	## Only allow these packets if they're not fragmented. (Don't trust safe
	287	## hosts's fragment reassembly to be robust against malicious fragments.)
	288	## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
	289	## of `! -f', so we do the negation using early return from a subchain.
	290	clearchain fwd-spec-nofrag
	291	run iptables -A fwd-spec-nofrag -j RETURN --fragment
	292	run ip6tables -A fwd-spec-nofrag -j RETURN \
	293	-m ipv6header --soft --header frag
87bf1592	294	run ip46tables -A FORWARD -j fwd-spec-nofrag
78af294c MW	295
	296	## Allow ping from safe/noloop to untrusted networks.
	297	run iptables -A fwd-spec-nofrag -j ACCEPT \
	298	-p icmp --icmp-type echo-request \
	299	-m mark --mark $to_untrusted/$MASK_TO
	300	run iptables -A fwd-spec-nofrag -j ACCEPT \
	301	-p icmp --icmp-type echo-reply \
	302	-m mark --mark $from_untrusted/$MASK_FROM \
	303	-m state --state ESTABLISHED
	304	run ip6tables -A fwd-spec-nofrag -j ACCEPT \
8b021091	305	-p icmpv6 --icmpv6-type echo-request \
78af294c MW	306	-m mark --mark $to_untrusted/$MASK_TO
78af294c MW	307	run ip6tables -A fwd-spec-nofrag -j ACCEPT \
8b021091	308	-p icmpv6 --icmpv6-type echo-reply \
78af294c MW	309	-m mark --mark $from_untrusted/$MASK_FROM \
	310	-m state --state ESTABLISHED
	311
	312	## Allow SSH from safe/noloop to untrusted networks.
cbbd5e39	313	run ip46tables -A fwd-spec-nofrag -j ACCEPT \
78af294c MW	314	-p tcp --destination-port $port_ssh \
78af294c MW	315	-m mark --mark $to_untrusted/$MASK_TO
cbbd5e39	316	run ip46tables -A fwd-spec-nofrag -j ACCEPT \
78af294c MW	317	-p tcp --source-port $port_ssh \
	318	-m mark --mark $from_untrusted/$MASK_FROM \
	319	-m state --state ESTABLISHED
	320
	321	;;
	322	esac
	323
a4d8cae3	324	m4_divert(80)m4_dnl
ade2c052 MW	325	###--------------------------------------------------------------------------
	326	### Kill things we don't understand properly.
	327	###
	328	### I don't like having to do this, but since I don't know how to do proper
	329	### multicast filtering, I'm just going to ban it from being forwarded.
	330
	331	errorchain poorly-understood REJECT
	332
	333	## Ban multicast destination addresses in forwarding.
78af294c MW	334	case $forward in
	335	1)
	336	run iptables -A FORWARD -g poorly-understood \
	337	-d 224.0.0.0/4
	338	run ip6tables -A FORWARD -g poorly-understood \
	339	-d ff::/8
	340	;;
	341	esac
ade2c052	342
a4d8cae3	343	m4_divert(84)m4_dnl
bfdc045d MW	344	###--------------------------------------------------------------------------
	345	### Locally-bound packet inspection.
	346
	347	clearchain inbound
	348
	349	## Track connections.
ecdca131	350	commonrules inbound
bfdc045d MW	351	conntrack inbound
	352
	353	## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
	354	## local request.
	355	run iptables -A inbound -j ACCEPT \
	356	-s 0.0.0.0 -d 255.255.255.255 \
	357	-p udp --source-port $port_bootpc --destination-port $port_bootps
	358	run iptables -A inbound -j ACCEPT \
	359	-s 172.29.198.0/23 \
	360	-p udp --source-port $port_bootpc --destination-port $port_bootps
	361
	362	## Allow incoming ping. This is the only ICMP left.
0291d6d5	363	run ip46tables -A inbound -j ACCEPT -p icmp
bfdc045d MW	364
	365	m4_divert(88)m4_dnl
	366	## Allow unusual things.
	367	openports inbound
	368
	369	## Inspect inbound packets from untrusted sources.
0291d6d5	370	run ip46tables -A inbound -j forbidden
4f8c1989	371	run ip46tables -A INPUT -m mark --mark $from_scary/$MASK_FROM -g inbound
0291d6d5	372	run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
bfdc045d	373
1b534b6a	374	## Allow responses from the scary outside world into the untrusted net, but
43e20546	375	## don't let untrusted things run services.
1b534b6a MW	376	case $forward in
	377	1)
	378	run ip46tables -A FORWARD -j ACCEPT \
	379	-m mark --mark $(( $from_scary \| $to_untrusted ))/$(( $MASK_FROM \| $MASK_TO )) \
	380	-m state --state ESTABLISHED,RELATED
	381	;;
	382	esac
	383
bfdc045d	384	## Otherwise process as indicated by the mark.
f0033e07 MW	385	for i in $inchains; do
	386	run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
	387	done
bfdc045d MW	388
	389	m4_divert(-1)
	390	###----- That's all, folks --------------------------------------------------