[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.
##
## 81.2.113.195, 81.187.238.128/28
##		House border network (dmz).  We have all of these; the loose
##		address is 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.
##
## 2001:8b0:c92::/48
##		Main house range (aaisp).  See below for allocation policy.
##		There is no explicit DMZ allocation (and no need for one).
##
## 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.
## fff		Local border network.
##
## 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 81.2.113.195 81.187.238.128/28 2001:8b0:c92:fff::/64
	via unsafe untrusted
defnet unsafe trusted
	addr 172.29.199.0/25 2001:8b0:c92:1::/64
	via househub
defnet safe safe
	addr 172.29.199.192/27 2001:8b0:c92:4001::/64
	via househub
defnet untrusted untrusted
	addr 172.29.198.0/25 2001:8b0:c92:8001::/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 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 trusted
	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 81.2.113.195 81.187.238.128/28 2001:8b0:c92::/48
	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	##
f01cdc79	42	## 81.2.113.195, 81.187.238.128/28
295959ea MW	43	## House border network (dmz). We have all of these; the loose
295959ea MW	44	## address is for the router.
f01cdc79	45	##
36e36cc7 MW	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	##
f01cdc79 MW	72	## 2001:8b0:c92::/48
	73	## Main house range (aaisp). See below for allocation policy.
	74	## There is no explicit DMZ allocation (and no need for one).
	75	##
36e36cc7 MW	76	## 2001:ba8:0:1d9::/64
	77	## Jump border network (jump): :1 is the router (supplied by
	78	## Jump); other addresses are ours.
	79	##
	80	## 2001:ba8:1d9::/48
	81	## Main colocated range. See below for allocation policy.
	82	##
	83	## Addresses in the /64 networks are simply allocated in ascending order.
	84	## The /48s are split into /64s by appending a 16-bit network number. The
	85	## top nibble of the network number classifies the network, as follows.
	86	##
42f784e2	87	## axxx Virtual, untrusted
36e36cc7	88	## 8xxx Untrusted
2caaca79	89	## 6xxx Virtual, safe
36e36cc7 MW	90	## 4xxx Safe
	91	## 0xxx Unsafe, trusted
	92	##
	93	## These have been chosen so that network properties can be deduced by
	94	## inspecting bits of the network number:
	95	##
	96	## Bit 15 If set, the network is untrusted; otherwise it is trusted.
	97	## Bit 14 If set, the network is safe; otherwise it is unsafe.
	98	##
	99	## Finally, the low-order nibbles identify the site.
	100	##
	101	## 0 No specific site: mobile VPN endpoints or anycast addresses.
	102	## 1 House.
	103	## 2 Jump colocation.
295959ea	104	## fff Local border network.
36e36cc7 MW	105	##
	106	## Usually site-0 networks are allocated from the Jump range to improve
	107	## expected performance from/to external sites which don't engage in our
	108	## dynamic routing protocols.
	109
bfdc045d MW	110	## Define the available network classes.
bfdc045d MW	111	m4_divert(42)m4_dnl
8670c87d	112	defnetclass scary scary trusted mcast
1b534b6a MW	113	defnetclass untrusted scary untrusted trusted mcast
	114	defnetclass trusted scary untrusted trusted safe noloop mcast
	115	defnetclass safe trusted safe noloop mcast
	116	defnetclass noloop trusted safe mcast
951e7943	117
44f95827 MW	118	defnetclass link
44f95827 MW	119	defnetclass mcast
a4d8cae3	120	m4_divert(-1)
bfdc045d	121
a4d8cae3	122	m4_divert(26)m4_dnl
bfdc045d MW	123	###--------------------------------------------------------------------------
	124	### Network layout.
	125
beb4f0ee MW	126	## House networks.
beb4f0ee MW	127	defnet dmz trusted
295959ea	128	addr 81.2.113.195 81.187.238.128/28 2001:8b0:c92:fff::/64
17a45245	129	via unsafe untrusted
beb4f0ee	130	defnet unsafe trusted
295959ea	131	addr 172.29.199.0/25 2001:8b0:c92:1::/64
17a45245	132	via househub
beb4f0ee	133	defnet safe safe
295959ea	134	addr 172.29.199.192/27 2001:8b0:c92:4001::/64
17a45245	135	via househub
beb4f0ee	136	defnet untrusted untrusted
295959ea	137	addr 172.29.198.0/25 2001:8b0:c92:8001::/64
17a45245	138	via househub
bfdc045d	139
beb4f0ee	140	defnet househub virtual
17a45245	141	via housebdry dmz unsafe safe untrusted
beb4f0ee	142	defnet housebdry virtual
17a45245	143	via househub hub
beb4f0ee MW	144
	145	## House hosts.
	146	defhost radius
4eb9f4df	147	hosttype router
68f0829f MW	148	iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default
68f0829f MW	149	iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default
960a9996	150	iface eth2 dmz unsafe safe untrusted vpn sgo colobdry
83cc1e6c	151	iface eth3 unsafe untrusted vpn default
8506ff83	152	iface ppp0 default
a7e48c06	153	iface t6-he default
68f0829f MW	154	iface vpn-precision colobdry vpn sgo
	155	iface vpn-chiark sgo
	156	iface vpn-+ vpn
beb4f0ee	157	defhost roadstar
ce6434f7 MW	158	iface eth0 dmz unsafe
ce6434f7 MW	159	iface eth1 dmz unsafe
beb4f0ee	160	defhost jem
ce6434f7 MW	161	iface eth0 dmz unsafe
ce6434f7 MW	162	iface eth1 dmz unsafe
97320b7d MW	163	defhost universe
	164	iface eth0 dmz unsafe
	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
d8e50664	193	iface eth0 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	220	iface vpn-chiark sgo
38e85ca3	221	iface vpn-national upn
ebaa31a7	222	iface vpn-+ vpn
beb4f0ee	223	defhost telecaster
ce6434f7 MW	224	iface eth0 jump colo
ce6434f7 MW	225	iface eth1 jump colo
beb4f0ee	226	defhost stratocaster
ce6434f7 MW	227	iface eth0 jump colo
ce6434f7 MW	228	iface eth1 jump colo
beb4f0ee	229	defhost jazz
560ae309 MW	230	hosttype router
	231	iface eth0 jump colo vpn
	232	iface eth1 jump colo vpn
148d527c	233	iface dns0 iodine
560ae309	234	iface vpn-+ vpn
beb4f0ee MW	235
	236	## Other networks.
	237	defnet hub virtual
17a45245	238	via housebdry colobdry
ebaa31a7 MW	239	defnet sgo noloop
	240	addr !172.29.198.0/23
	241	addr 10.0.0.0/8
	242	addr 172.16.0.0/12
	243	addr 192.168.0.0/16
17a45245	244	via househub colohub
57644f26	245	defnet vpn trusted
7dff2754	246	addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
17a45245	247	via househub colohub
eec061c0 MW	248	host crybaby 1 ::1:1
	249	host terror 2 ::2:1
	250	host orange 3 ::3:1
a28edce0	251	host haze 4 ::4:1
24ddb007	252	host groove 5 ::5:1
c68b8ecc MW	253	defnet anycast trusted
c68b8ecc MW	254	addr 172.29.199.224/27 2001:ba8:1d9:0::/64
17a45245	255	via dmz unsafe safe untrusted jump colo vpn
1b534b6a	256	defnet default scary
295959ea	257	addr 81.2.113.195 81.187.238.128/28 2001:8b0:c92::/48
b9e891b5 MW	258	addr 212.13.198.64/28 2001:ba8:0:1d9::/64
b9e891b5 MW	259	addr 2001:ba8:1d9::/48 #temporary
17a45245	260	via dmz unsafe untrusted jump colo
42f784e2 MW	261	defnet upn untrusted
	262	addr 172.29.198.160/27 2001:ba8:1d9:a000::/64
	263	via colohub
38e85ca3 MW	264	host national 1 ::1:1
	265
	266	## Linode hosts.
	267	defhost national
	268	iface eth0 default
	269	iface vpn-precision colohub
1ee6211d	270
1fd9cef9 MW	271	## Satellite networks.
	272	defnet binswood noloop
	273	addr 10.165.27.0/24
	274	via colohub
31c0a107 MW	275	defhost mango
	276	hosttype router
	277	iface eth0 binswood default
	278	iface vpn-precision colo
	279
a4d8cae3	280	m4_divert(80)m4_dnl
bfdc045d	281	###--------------------------------------------------------------------------
5c5fcd73 MW	282	### Connection tracking helper modules.
	283
	284	for i in ftp; do
	285	modprobe nf_conntrack_$i
	286	done
	287
	288	m4_divert(80)m4_dnl
	289	###--------------------------------------------------------------------------
bfdc045d MW	290	### Special forwarding exemptions.
bfdc045d MW	291
78af294c MW	292	case $forward in
	293	1)
	294
	295	## Only allow these packets if they're not fragmented. (Don't trust safe
	296	## hosts's fragment reassembly to be robust against malicious fragments.)
	297	## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
	298	## of `! -f', so we do the negation using early return from a subchain.
	299	clearchain fwd-spec-nofrag
	300	run iptables -A fwd-spec-nofrag -j RETURN --fragment
	301	run ip6tables -A fwd-spec-nofrag -j RETURN \
	302	-m ipv6header --soft --header frag
87bf1592	303	run ip46tables -A FORWARD -j fwd-spec-nofrag
78af294c MW	304
	305	## Allow ping from safe/noloop to untrusted networks.
	306	run iptables -A fwd-spec-nofrag -j ACCEPT \
	307	-p icmp --icmp-type echo-request \
	308	-m mark --mark $to_untrusted/$MASK_TO
	309	run iptables -A fwd-spec-nofrag -j ACCEPT \
	310	-p icmp --icmp-type echo-reply \
	311	-m mark --mark $from_untrusted/$MASK_FROM \
	312	-m state --state ESTABLISHED
	313	run ip6tables -A fwd-spec-nofrag -j ACCEPT \
8b021091	314	-p icmpv6 --icmpv6-type echo-request \
78af294c MW	315	-m mark --mark $to_untrusted/$MASK_TO
78af294c MW	316	run ip6tables -A fwd-spec-nofrag -j ACCEPT \
8b021091	317	-p icmpv6 --icmpv6-type echo-reply \
78af294c MW	318	-m mark --mark $from_untrusted/$MASK_FROM \
	319	-m state --state ESTABLISHED
	320
	321	## Allow SSH from safe/noloop to untrusted networks.
cbbd5e39	322	run ip46tables -A fwd-spec-nofrag -j ACCEPT \
78af294c MW	323	-p tcp --destination-port $port_ssh \
78af294c MW	324	-m mark --mark $to_untrusted/$MASK_TO
cbbd5e39	325	run ip46tables -A fwd-spec-nofrag -j ACCEPT \
78af294c MW	326	-p tcp --source-port $port_ssh \
	327	-m mark --mark $from_untrusted/$MASK_FROM \
	328	-m state --state ESTABLISHED
	329
	330	;;
	331	esac
	332
a4d8cae3	333	m4_divert(80)m4_dnl
ade2c052 MW	334	###--------------------------------------------------------------------------
	335	### Kill things we don't understand properly.
	336	###
	337	### I don't like having to do this, but since I don't know how to do proper
	338	### multicast filtering, I'm just going to ban it from being forwarded.
	339
	340	errorchain poorly-understood REJECT
	341
	342	## Ban multicast destination addresses in forwarding.
78af294c MW	343	case $forward in
	344	1)
	345	run iptables -A FORWARD -g poorly-understood \
	346	-d 224.0.0.0/4
	347	run ip6tables -A FORWARD -g poorly-understood \
	348	-d ff::/8
	349	;;
	350	esac
ade2c052	351
a4d8cae3	352	m4_divert(84)m4_dnl
bfdc045d MW	353	###--------------------------------------------------------------------------
	354	### Locally-bound packet inspection.
	355
	356	clearchain inbound
	357
	358	## Track connections.
ecdca131	359	commonrules inbound
bfdc045d MW	360	conntrack inbound
	361
	362	## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
	363	## local request.
	364	run iptables -A inbound -j ACCEPT \
	365	-s 0.0.0.0 -d 255.255.255.255 \
	366	-p udp --source-port $port_bootpc --destination-port $port_bootps
	367	run iptables -A inbound -j ACCEPT \
	368	-s 172.29.198.0/23 \
	369	-p udp --source-port $port_bootpc --destination-port $port_bootps
	370
	371	## Allow incoming ping. This is the only ICMP left.
8bd7e0fe MW	372	run iptables -A inbound -j ACCEPT -p icmp
8bd7e0fe MW	373	run ip6tables -A inbound -j ACCEPT -p icmpv6
bfdc045d MW	374
	375	m4_divert(88)m4_dnl
	376	## Allow unusual things.
	377	openports inbound
	378
	379	## Inspect inbound packets from untrusted sources.
0291d6d5	380	run ip46tables -A inbound -j forbidden
4f8c1989	381	run ip46tables -A INPUT -m mark --mark $from_scary/$MASK_FROM -g inbound
0291d6d5	382	run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
bfdc045d	383
1b534b6a	384	## Allow responses from the scary outside world into the untrusted net, but
43e20546	385	## don't let untrusted things run services.
1b534b6a MW	386	case $forward in
	387	1)
	388	run ip46tables -A FORWARD -j ACCEPT \
	389	-m mark --mark $(( $from_scary \| $to_untrusted ))/$(( $MASK_FROM \| $MASK_TO )) \
	390	-m state --state ESTABLISHED,RELATED
	391	;;
	392	esac
	393
bfdc045d	394	## Otherwise process as indicated by the mark.
f0033e07 MW	395	for i in $inchains; do
	396	run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
	397	done
bfdc045d MW	398
	399	m4_divert(-1)
	400	###----- That's all, folks --------------------------------------------------