[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
##	.160/27		untrusted virtual 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.
##
## axxx		Virtual, untrusted
## 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 universe
	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-national upn
	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
defnet upn untrusted
	addr 172.29.198.160/27 2001:ba8:1d9:a000::/64
	via colohub
	host national 1 ::1:1

## Linode hosts.
defhost national
	iface eth0 default
	iface vpn-precision colohub

## 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 iptables -A inbound -j ACCEPT -p icmp
run ip6tables -A inbound -j ACCEPT -p icmpv6

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
42f784e2	57	## .160/27 untrusted virtual network
36e36cc7 MW	58	##
	59	## 172.29.199.0/24 Trusted networks.
	60	## .0/25 house wired network
	61	## .128/27 mobile VPN hosts
	62	## .160/28 reserved, except .160/30 allocated for ITS
	63	## .176/28 internal colocated network
	64	## .192/27 house safe network
	65	## .224/27 anycast services
	66
	67	## IPv6 addressing.
	68	##
	69	## There are five blocks of publicly routable IPv6 addresses, though some of
	70	## them aren't very interesting. The ranges are as follows.
	71	##
	72	## 2001:470:1f08:1b98::/64
	73	## Hurricane Electric tunnel network: only :1 (HE) and :2
	74	## (radius) are used.
	75	##
	76	## 2001:470:1f09:1b98::/64
	77	## House border network (dmz).
	78	##
	79	## 2001:470:9740::/48
	80	## Main house range. See below for allocation policy.
	81	##
	82	## 2001:ba8:0:1d9::/64
	83	## Jump border network (jump): :1 is the router (supplied by
	84	## Jump); other addresses are ours.
	85	##
	86	## 2001:ba8:1d9::/48
	87	## Main colocated range. See below for allocation policy.
	88	##
	89	## Addresses in the /64 networks are simply allocated in ascending order.
	90	## The /48s are split into /64s by appending a 16-bit network number. The
	91	## top nibble of the network number classifies the network, as follows.
	92	##
42f784e2	93	## axxx Virtual, untrusted
36e36cc7	94	## 8xxx Untrusted
2caaca79	95	## 6xxx Virtual, safe
36e36cc7 MW	96	## 4xxx Safe
	97	## 0xxx Unsafe, trusted
	98	##
	99	## These have been chosen so that network properties can be deduced by
	100	## inspecting bits of the network number:
	101	##
	102	## Bit 15 If set, the network is untrusted; otherwise it is trusted.
	103	## Bit 14 If set, the network is safe; otherwise it is unsafe.
	104	##
	105	## Finally, the low-order nibbles identify the site.
	106	##
	107	## 0 No specific site: mobile VPN endpoints or anycast addresses.
	108	## 1 House.
	109	## 2 Jump colocation.
	110	##
	111	## Usually site-0 networks are allocated from the Jump range to improve
	112	## expected performance from/to external sites which don't engage in our
	113	## dynamic routing protocols.
	114
bfdc045d MW	115	## Define the available network classes.
bfdc045d MW	116	m4_divert(42)m4_dnl
8670c87d	117	defnetclass scary scary trusted mcast
1b534b6a MW	118	defnetclass untrusted scary untrusted trusted mcast
	119	defnetclass trusted scary untrusted trusted safe noloop mcast
	120	defnetclass safe trusted safe noloop mcast
	121	defnetclass noloop trusted safe mcast
951e7943	122
44f95827 MW	123	defnetclass link
44f95827 MW	124	defnetclass mcast
a4d8cae3	125	m4_divert(-1)
bfdc045d	126
a4d8cae3	127	m4_divert(26)m4_dnl
bfdc045d MW	128	###--------------------------------------------------------------------------
	129	### Network layout.
	130
beb4f0ee MW	131	## House networks.
beb4f0ee MW	132	defnet dmz trusted
b9e891b5	133	addr 62.49.204.144/28 2001:470:1f09:1b98::/64
17a45245	134	via unsafe untrusted
beb4f0ee	135	defnet unsafe trusted
b9e891b5	136	addr 172.29.199.0/25 2001:470:9740:1::/64
17a45245	137	via househub
beb4f0ee	138	defnet safe safe
216285e1	139	addr 172.29.199.192/27 2001:470:9740:4001::/64
17a45245	140	via househub
beb4f0ee	141	defnet untrusted untrusted
b9e891b5	142	addr 172.29.198.0/25 2001:470:9740:8001::/64
17a45245	143	via househub
bfdc045d	144
beb4f0ee	145	defnet househub virtual
17a45245	146	via housebdry dmz unsafe safe untrusted
beb4f0ee	147	defnet housebdry virtual
17a45245	148	via househub hub
beb4f0ee MW	149
	150	## House hosts.
	151	defhost radius
4eb9f4df	152	hosttype router
68f0829f MW	153	iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default
68f0829f MW	154	iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default
960a9996	155	iface eth2 dmz unsafe safe untrusted vpn sgo colobdry
83cc1e6c	156	iface eth3 unsafe untrusted vpn default
8506ff83	157	iface ppp0 default
a7e48c06	158	iface t6-he default
68f0829f MW	159	iface vpn-precision colobdry vpn sgo
	160	iface vpn-chiark sgo
	161	iface vpn-+ vpn
beb4f0ee	162	defhost roadstar
ce6434f7 MW	163	iface eth0 dmz unsafe
ce6434f7 MW	164	iface eth1 dmz unsafe
beb4f0ee	165	defhost jem
ce6434f7 MW	166	iface eth0 dmz unsafe
ce6434f7 MW	167	iface eth1 dmz unsafe
97320b7d MW	168	defhost universe
	169	iface eth0 dmz unsafe
	170	iface eth1 dmz unsafe
beb4f0ee	171	defhost artist
564c6939	172	hosttype router
490003e4 MW	173	iface eth0 dmz unsafe untrusted
490003e4 MW	174	iface eth1 dmz unsafe untrusted
83cc1e6c	175	iface eth3 unsafe untrusted
beb4f0ee	176	defhost vampire
4eb9f4df	177	hosttype router
2b17ac87 MW	178	iface eth0.4 dmz unsafe untrusted safe vpn sgo colobdry
	179	iface eth0.5 dmz unsafe untrusted safe vpn sgo colobdry
	180	iface eth0.6 dmz unsafe safe untrusted vpn sgo colobdry
83cc1e6c	181	iface eth0.7 unsafe untrusted vpn
68f0829f	182	iface vpn-precision colobdry vpn sgo
ebaa31a7 MW	183	iface vpn-chiark sgo
ebaa31a7 MW	184	iface vpn-+ vpn
beb4f0ee	185	defhost ibanez
06ff8082	186	iface br-dmz dmz unsafe
beb4f0ee	187	iface br-unsafe unsafe
6fd217ae MW	188	defhost orange
	189	iface wlan0 untrusted
	190	iface vpn-radius unsafe
49b81a66 MW	191	defhost groove
49b81a66 MW	192	iface eth0 unsafe
24ddb007 MW	193	iface wlan0 untrusted
24ddb007 MW	194	iface vpn-radius unsafe
beb4f0ee MW	195
beb4f0ee MW	196	defhost gibson
4eb9f4df	197	hosttype client
15e9eeff	198	iface eth0.5 unsafe
beb4f0ee MW	199
	200	## Colocated networks.
	201	defnet jump trusted
b9e891b5	202	addr 212.13.198.64/28 2001:ba8:0:1d9::/64
17a45245	203	via colohub
beb4f0ee	204	defnet colo trusted
b9e891b5	205	addr 172.29.199.176/28 2001:ba8:1d9:2::/64
17a45245	206	via colohub
beb4f0ee	207	defnet colohub virtual
9853a66d	208	via colobdry jump colo
beb4f0ee	209	defnet colobdry virtual
17a45245	210	via colohub hub
148d527c MW	211	defnet iodine untrusted
148d527c MW	212	addr 172.29.198.128/28
17a45245	213	via colohub
beb4f0ee MW	214
	215	## Colocated hosts.
	216	defhost fender
ce6434f7 MW	217	iface br-jump jump colo
ce6434f7 MW	218	iface br-colo jump colo
beb4f0ee	219	defhost precision
4eb9f4df	220	hosttype router
560ae309 MW	221	iface eth0 jump colo vpn sgo
560ae309 MW	222	iface eth1 jump colo vpn sgo
1fd9cef9	223	iface vpn-mango binswood
68f0829f	224	iface vpn-radius housebdry vpn sgo
ebaa31a7	225	iface vpn-chiark sgo
38e85ca3	226	iface vpn-national upn
ebaa31a7	227	iface vpn-+ vpn
beb4f0ee	228	defhost telecaster
ce6434f7 MW	229	iface eth0 jump colo
ce6434f7 MW	230	iface eth1 jump colo
beb4f0ee	231	defhost stratocaster
ce6434f7 MW	232	iface eth0 jump colo
ce6434f7 MW	233	iface eth1 jump colo
beb4f0ee	234	defhost jazz
560ae309 MW	235	hosttype router
	236	iface eth0 jump colo vpn
	237	iface eth1 jump colo vpn
148d527c	238	iface dns0 iodine
560ae309	239	iface vpn-+ vpn
beb4f0ee MW	240
	241	## Other networks.
	242	defnet hub virtual
17a45245	243	via housebdry colobdry
ebaa31a7 MW	244	defnet sgo noloop
	245	addr !172.29.198.0/23
	246	addr 10.0.0.0/8
	247	addr 172.16.0.0/12
	248	addr 192.168.0.0/16
17a45245	249	via househub colohub
7dff2754 MW	250	defnet vpn safe
7dff2754 MW	251	addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
17a45245	252	via househub colohub
eec061c0 MW	253	host crybaby 1 ::1:1
	254	host terror 2 ::2:1
	255	host orange 3 ::3:1
a28edce0	256	host haze 4 ::4:1
24ddb007	257	host groove 5 ::5:1
c68b8ecc MW	258	defnet anycast trusted
c68b8ecc MW	259	addr 172.29.199.224/27 2001:ba8:1d9:0::/64
17a45245	260	via dmz unsafe safe untrusted jump colo vpn
1b534b6a	261	defnet default scary
b9e891b5 MW	262	addr 62.49.204.144/28 2001:470:1f09:1b98::/64
	263	addr 212.13.198.64/28 2001:ba8:0:1d9::/64
	264	addr 2001:ba8:1d9::/48 #temporary
17a45245	265	via dmz unsafe untrusted jump colo
42f784e2 MW	266	defnet upn untrusted
	267	addr 172.29.198.160/27 2001:ba8:1d9:a000::/64
	268	via colohub
38e85ca3 MW	269	host national 1 ::1:1
	270
	271	## Linode hosts.
	272	defhost national
	273	iface eth0 default
	274	iface vpn-precision colohub
1ee6211d	275
1fd9cef9 MW	276	## Satellite networks.
	277	defnet binswood noloop
	278	addr 10.165.27.0/24
	279	via colohub
31c0a107 MW	280	defhost mango
	281	hosttype router
	282	iface eth0 binswood default
	283	iface vpn-precision colo
	284
a4d8cae3	285	m4_divert(80)m4_dnl
bfdc045d	286	###--------------------------------------------------------------------------
5c5fcd73 MW	287	### Connection tracking helper modules.
	288
	289	for i in ftp; do
	290	modprobe nf_conntrack_$i
	291	done
	292
	293	m4_divert(80)m4_dnl
	294	###--------------------------------------------------------------------------
bfdc045d MW	295	### Special forwarding exemptions.
bfdc045d MW	296
78af294c MW	297	case $forward in
	298	1)
	299
	300	## Only allow these packets if they're not fragmented. (Don't trust safe
	301	## hosts's fragment reassembly to be robust against malicious fragments.)
	302	## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
	303	## of `! -f', so we do the negation using early return from a subchain.
	304	clearchain fwd-spec-nofrag
	305	run iptables -A fwd-spec-nofrag -j RETURN --fragment
	306	run ip6tables -A fwd-spec-nofrag -j RETURN \
	307	-m ipv6header --soft --header frag
87bf1592	308	run ip46tables -A FORWARD -j fwd-spec-nofrag
78af294c MW	309
	310	## Allow ping from safe/noloop to untrusted networks.
	311	run iptables -A fwd-spec-nofrag -j ACCEPT \
	312	-p icmp --icmp-type echo-request \
	313	-m mark --mark $to_untrusted/$MASK_TO
	314	run iptables -A fwd-spec-nofrag -j ACCEPT \
	315	-p icmp --icmp-type echo-reply \
	316	-m mark --mark $from_untrusted/$MASK_FROM \
	317	-m state --state ESTABLISHED
	318	run ip6tables -A fwd-spec-nofrag -j ACCEPT \
8b021091	319	-p icmpv6 --icmpv6-type echo-request \
78af294c MW	320	-m mark --mark $to_untrusted/$MASK_TO
78af294c MW	321	run ip6tables -A fwd-spec-nofrag -j ACCEPT \
8b021091	322	-p icmpv6 --icmpv6-type echo-reply \
78af294c MW	323	-m mark --mark $from_untrusted/$MASK_FROM \
	324	-m state --state ESTABLISHED
	325
	326	## Allow SSH from safe/noloop to untrusted networks.
cbbd5e39	327	run ip46tables -A fwd-spec-nofrag -j ACCEPT \
78af294c MW	328	-p tcp --destination-port $port_ssh \
78af294c MW	329	-m mark --mark $to_untrusted/$MASK_TO
cbbd5e39	330	run ip46tables -A fwd-spec-nofrag -j ACCEPT \
78af294c MW	331	-p tcp --source-port $port_ssh \
	332	-m mark --mark $from_untrusted/$MASK_FROM \
	333	-m state --state ESTABLISHED
	334
	335	;;
	336	esac
	337
a4d8cae3	338	m4_divert(80)m4_dnl
ade2c052 MW	339	###--------------------------------------------------------------------------
	340	### Kill things we don't understand properly.
	341	###
	342	### I don't like having to do this, but since I don't know how to do proper
	343	### multicast filtering, I'm just going to ban it from being forwarded.
	344
	345	errorchain poorly-understood REJECT
	346
	347	## Ban multicast destination addresses in forwarding.
78af294c MW	348	case $forward in
	349	1)
	350	run iptables -A FORWARD -g poorly-understood \
	351	-d 224.0.0.0/4
	352	run ip6tables -A FORWARD -g poorly-understood \
	353	-d ff::/8
	354	;;
	355	esac
ade2c052	356
a4d8cae3	357	m4_divert(84)m4_dnl
bfdc045d MW	358	###--------------------------------------------------------------------------
	359	### Locally-bound packet inspection.
	360
	361	clearchain inbound
	362
	363	## Track connections.
ecdca131	364	commonrules inbound
bfdc045d MW	365	conntrack inbound
	366
	367	## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
	368	## local request.
	369	run iptables -A inbound -j ACCEPT \
	370	-s 0.0.0.0 -d 255.255.255.255 \
	371	-p udp --source-port $port_bootpc --destination-port $port_bootps
	372	run iptables -A inbound -j ACCEPT \
	373	-s 172.29.198.0/23 \
	374	-p udp --source-port $port_bootpc --destination-port $port_bootps
	375
	376	## Allow incoming ping. This is the only ICMP left.
8bd7e0fe MW	377	run iptables -A inbound -j ACCEPT -p icmp
8bd7e0fe MW	378	run ip6tables -A inbound -j ACCEPT -p icmpv6
bfdc045d MW	379
	380	m4_divert(88)m4_dnl
	381	## Allow unusual things.
	382	openports inbound
	383
	384	## Inspect inbound packets from untrusted sources.
0291d6d5	385	run ip46tables -A inbound -j forbidden
4f8c1989	386	run ip46tables -A INPUT -m mark --mark $from_scary/$MASK_FROM -g inbound
0291d6d5	387	run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
bfdc045d	388
1b534b6a	389	## Allow responses from the scary outside world into the untrusted net, but
43e20546	390	## don't let untrusted things run services.
1b534b6a MW	391	case $forward in
	392	1)
	393	run ip46tables -A FORWARD -j ACCEPT \
	394	-m mark --mark $(( $from_scary \| $to_untrusted ))/$(( $MASK_FROM \| $MASK_TO )) \
	395	-m state --state ESTABLISHED,RELATED
	396	;;
	397	esac
	398
bfdc045d	399	## Otherwise process as indicated by the mark.
f0033e07 MW	400	for i in $inchains; do
	401	run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
	402	done
bfdc045d MW	403
	404	m4_divert(-1)
	405	###----- That's all, folks --------------------------------------------------