[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 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
1b534b6a MW	117	defnetclass scary scary trusted mcast
	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
beb4f0ee	168	defhost artist
564c6939	169	hosttype router
490003e4 MW	170	iface eth0 dmz unsafe untrusted
490003e4 MW	171	iface eth1 dmz unsafe untrusted
83cc1e6c	172	iface eth3 unsafe untrusted
beb4f0ee	173	defhost vampire
4eb9f4df	174	hosttype router
2b17ac87 MW	175	iface eth0.4 dmz unsafe untrusted safe vpn sgo colobdry
	176	iface eth0.5 dmz unsafe untrusted safe vpn sgo colobdry
	177	iface eth0.6 dmz unsafe safe untrusted vpn sgo colobdry
83cc1e6c	178	iface eth0.7 unsafe untrusted vpn
68f0829f	179	iface vpn-precision colobdry vpn sgo
ebaa31a7 MW	180	iface vpn-chiark sgo
ebaa31a7 MW	181	iface vpn-+ vpn
beb4f0ee	182	defhost ibanez
06ff8082	183	iface br-dmz dmz unsafe
beb4f0ee	184	iface br-unsafe unsafe
6fd217ae MW	185	defhost orange
	186	iface wlan0 untrusted
	187	iface vpn-radius unsafe
49b81a66 MW	188	defhost groove
49b81a66 MW	189	iface eth0 unsafe
24ddb007 MW	190	iface wlan0 untrusted
24ddb007 MW	191	iface vpn-radius unsafe
beb4f0ee MW	192
beb4f0ee MW	193	defhost gibson
4eb9f4df	194	hosttype client
15e9eeff	195	iface eth0.5 unsafe
beb4f0ee MW	196
	197	## Colocated networks.
	198	defnet jump trusted
b9e891b5	199	addr 212.13.198.64/28 2001:ba8:0:1d9::/64
17a45245	200	via colohub
beb4f0ee	201	defnet colo trusted
b9e891b5	202	addr 172.29.199.176/28 2001:ba8:1d9:2::/64
17a45245	203	via colohub
beb4f0ee	204	defnet colohub virtual
9853a66d	205	via colobdry jump colo
beb4f0ee	206	defnet colobdry virtual
17a45245	207	via colohub hub
148d527c MW	208	defnet iodine untrusted
148d527c MW	209	addr 172.29.198.128/28
17a45245	210	via colohub
beb4f0ee MW	211
	212	## Colocated hosts.
	213	defhost fender
ce6434f7 MW	214	iface br-jump jump colo
ce6434f7 MW	215	iface br-colo jump colo
beb4f0ee	216	defhost precision
4eb9f4df	217	hosttype router
560ae309 MW	218	iface eth0 jump colo vpn sgo
560ae309 MW	219	iface eth1 jump colo vpn sgo
1fd9cef9	220	iface vpn-mango binswood
68f0829f	221	iface vpn-radius housebdry vpn sgo
ebaa31a7	222	iface vpn-chiark sgo
38e85ca3	223	iface vpn-national upn
ebaa31a7	224	iface vpn-+ vpn
beb4f0ee	225	defhost telecaster
ce6434f7 MW	226	iface eth0 jump colo
ce6434f7 MW	227	iface eth1 jump colo
beb4f0ee	228	defhost stratocaster
ce6434f7 MW	229	iface eth0 jump colo
ce6434f7 MW	230	iface eth1 jump colo
beb4f0ee	231	defhost jazz
560ae309 MW	232	hosttype router
	233	iface eth0 jump colo vpn
	234	iface eth1 jump colo vpn
148d527c	235	iface dns0 iodine
560ae309	236	iface vpn-+ vpn
beb4f0ee MW	237
	238	## Other networks.
	239	defnet hub virtual
17a45245	240	via housebdry colobdry
ebaa31a7 MW	241	defnet sgo noloop
	242	addr !172.29.198.0/23
	243	addr 10.0.0.0/8
	244	addr 172.16.0.0/12
	245	addr 192.168.0.0/16
17a45245	246	via househub colohub
7dff2754 MW	247	defnet vpn safe
7dff2754 MW	248	addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
17a45245	249	via househub colohub
eec061c0 MW	250	host crybaby 1 ::1:1
	251	host terror 2 ::2:1
	252	host orange 3 ::3:1
a28edce0	253	host haze 4 ::4:1
24ddb007	254	host groove 5 ::5:1
c68b8ecc MW	255	defnet anycast trusted
c68b8ecc MW	256	addr 172.29.199.224/27 2001:ba8:1d9:0::/64
17a45245	257	via dmz unsafe safe untrusted jump colo vpn
1b534b6a	258	defnet default scary
b9e891b5 MW	259	addr 62.49.204.144/28 2001:470:1f09:1b98::/64
	260	addr 212.13.198.64/28 2001:ba8:0:1d9::/64
	261	addr 2001:ba8:1d9::/48 #temporary
17a45245	262	via dmz unsafe untrusted jump colo
42f784e2 MW	263	defnet upn untrusted
	264	addr 172.29.198.160/27 2001:ba8:1d9:a000::/64
	265	via colohub
38e85ca3 MW	266	host national 1 ::1:1
	267
	268	## Linode hosts.
	269	defhost national
	270	iface eth0 default
	271	iface vpn-precision colohub
1ee6211d	272
1fd9cef9 MW	273	## Satellite networks.
	274	defnet binswood noloop
	275	addr 10.165.27.0/24
	276	via colohub
31c0a107 MW	277	defhost mango
	278	hosttype router
	279	iface eth0 binswood default
	280	iface vpn-precision colo
	281
a4d8cae3	282	m4_divert(80)m4_dnl
bfdc045d	283	###--------------------------------------------------------------------------
5c5fcd73 MW	284	### Connection tracking helper modules.
	285
	286	for i in ftp; do
	287	modprobe nf_conntrack_$i
	288	done
	289
	290	m4_divert(80)m4_dnl
	291	###--------------------------------------------------------------------------
bfdc045d MW	292	### Special forwarding exemptions.
bfdc045d MW	293
78af294c MW	294	case $forward in
	295	1)
	296
	297	## Only allow these packets if they're not fragmented. (Don't trust safe
	298	## hosts's fragment reassembly to be robust against malicious fragments.)
	299	## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
	300	## of `! -f', so we do the negation using early return from a subchain.
	301	clearchain fwd-spec-nofrag
	302	run iptables -A fwd-spec-nofrag -j RETURN --fragment
	303	run ip6tables -A fwd-spec-nofrag -j RETURN \
	304	-m ipv6header --soft --header frag
87bf1592	305	run ip46tables -A FORWARD -j fwd-spec-nofrag
78af294c MW	306
	307	## Allow ping from safe/noloop to untrusted networks.
	308	run iptables -A fwd-spec-nofrag -j ACCEPT \
	309	-p icmp --icmp-type echo-request \
	310	-m mark --mark $to_untrusted/$MASK_TO
	311	run iptables -A fwd-spec-nofrag -j ACCEPT \
	312	-p icmp --icmp-type echo-reply \
	313	-m mark --mark $from_untrusted/$MASK_FROM \
	314	-m state --state ESTABLISHED
	315	run ip6tables -A fwd-spec-nofrag -j ACCEPT \
8b021091	316	-p icmpv6 --icmpv6-type echo-request \
78af294c MW	317	-m mark --mark $to_untrusted/$MASK_TO
78af294c MW	318	run ip6tables -A fwd-spec-nofrag -j ACCEPT \
8b021091	319	-p icmpv6 --icmpv6-type echo-reply \
78af294c MW	320	-m mark --mark $from_untrusted/$MASK_FROM \
	321	-m state --state ESTABLISHED
	322
	323	## Allow SSH from safe/noloop to untrusted networks.
cbbd5e39	324	run ip46tables -A fwd-spec-nofrag -j ACCEPT \
78af294c MW	325	-p tcp --destination-port $port_ssh \
78af294c MW	326	-m mark --mark $to_untrusted/$MASK_TO
cbbd5e39	327	run ip46tables -A fwd-spec-nofrag -j ACCEPT \
78af294c MW	328	-p tcp --source-port $port_ssh \
	329	-m mark --mark $from_untrusted/$MASK_FROM \
	330	-m state --state ESTABLISHED
	331
	332	;;
	333	esac
	334
a4d8cae3	335	m4_divert(80)m4_dnl
ade2c052 MW	336	###--------------------------------------------------------------------------
	337	### Kill things we don't understand properly.
	338	###
	339	### I don't like having to do this, but since I don't know how to do proper
	340	### multicast filtering, I'm just going to ban it from being forwarded.
	341
	342	errorchain poorly-understood REJECT
	343
	344	## Ban multicast destination addresses in forwarding.
78af294c MW	345	case $forward in
	346	1)
	347	run iptables -A FORWARD -g poorly-understood \
	348	-d 224.0.0.0/4
	349	run ip6tables -A FORWARD -g poorly-understood \
	350	-d ff::/8
	351	;;
	352	esac
ade2c052	353
a4d8cae3	354	m4_divert(84)m4_dnl
bfdc045d MW	355	###--------------------------------------------------------------------------
	356	### Locally-bound packet inspection.
	357
	358	clearchain inbound
	359
	360	## Track connections.
ecdca131	361	commonrules inbound
bfdc045d MW	362	conntrack inbound
	363
	364	## Allow incoming bootp. Bootp won't be forwarded, so this is obviously a
	365	## local request.
	366	run iptables -A inbound -j ACCEPT \
	367	-s 0.0.0.0 -d 255.255.255.255 \
	368	-p udp --source-port $port_bootpc --destination-port $port_bootps
	369	run iptables -A inbound -j ACCEPT \
	370	-s 172.29.198.0/23 \
	371	-p udp --source-port $port_bootpc --destination-port $port_bootps
	372
	373	## Allow incoming ping. This is the only ICMP left.
8bd7e0fe MW	374	run iptables -A inbound -j ACCEPT -p icmp
8bd7e0fe MW	375	run ip6tables -A inbound -j ACCEPT -p icmpv6
bfdc045d MW	376
	377	m4_divert(88)m4_dnl
	378	## Allow unusual things.
	379	openports inbound
	380
	381	## Inspect inbound packets from untrusted sources.
0291d6d5	382	run ip46tables -A inbound -j forbidden
4f8c1989	383	run ip46tables -A INPUT -m mark --mark $from_scary/$MASK_FROM -g inbound
0291d6d5	384	run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
bfdc045d	385
1b534b6a	386	## Allow responses from the scary outside world into the untrusted net, but
43e20546	387	## don't let untrusted things run services.
1b534b6a MW	388	case $forward in
	389	1)
	390	run ip46tables -A FORWARD -j ACCEPT \
	391	-m mark --mark $(( $from_scary \| $to_untrusted ))/$(( $MASK_FROM \| $MASK_TO )) \
	392	-m state --state ESTABLISHED,RELATED
	393	;;
	394	esac
	395
bfdc045d	396	## Otherwise process as indicated by the mark.
f0033e07 MW	397	for i in $inchains; do
	398	run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
	399	done
bfdc045d MW	400
	401	m4_divert(-1)
	402	###----- That's all, folks --------------------------------------------------