X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/blobdiff_plain/960a999671b6958a40f71e68316d41402521957c..4f8c198960217f631e0fcb20e8615fc93c3d1da2:/local.m4 diff --git a/local.m4 b/local.m4 index 9dfc464..7e7ad15 100644 --- a/local.m4 +++ b/local.m4 @@ -33,12 +33,91 @@ 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 untrusted untrusted trusted mcast -defnetclass trusted untrusted trusted safe noloop mcast -defnetclass safe trusted safe noloop mcast -defnetclass noloop trusted safe mcast +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) @@ -50,24 +129,21 @@ m4_divert(26)m4_dnl ## House networks. defnet dmz trusted addr 62.49.204.144/28 2001:470:1f09:1b98::/64 - forwards unsafe untrusted + via unsafe untrusted defnet unsafe trusted addr 172.29.199.0/25 2001:470:9740:1::/64 - forwards househub + via househub defnet safe safe addr 172.29.199.192/27 2001:470:9740:4001::/64 - forwards househub + via househub defnet untrusted untrusted addr 172.29.198.0/25 2001:470:9740:8001::/64 - forwards househub -defnet iodine untrusted - addr 172.29.198.128/28 + via househub defnet househub virtual - forwards housebdry dmz unsafe safe untrusted + via housebdry dmz unsafe safe untrusted defnet housebdry virtual - forwards househub hub - noxit dmz + via househub hub ## House hosts. defhost radius @@ -75,7 +151,8 @@ defhost radius 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 untrusted vpn default + iface eth3 unsafe untrusted vpn default + iface ppp0 default iface t6-he default iface vpn-precision colobdry vpn sgo iface vpn-chiark sgo @@ -88,22 +165,28 @@ defhost jem iface eth1 dmz unsafe defhost artist hosttype router - iface eth0 dmz unsafe - iface eth1 dmz unsafe - iface eth3 untrusted + iface eth0 dmz unsafe untrusted + iface eth1 dmz unsafe untrusted + iface eth3 unsafe untrusted defhost vampire hosttype router - iface eth0.0 dmz unsafe untrusted safe vpn sgo colobdry - iface eth0.1 dmz unsafe untrusted safe vpn sgo colobdry - iface eth0.2 dmz unsafe safe untrusted vpn sgo colobdry - iface eth0.3 untrusted - iface dns0 iodine + 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 @@ -112,15 +195,17 @@ defhost gibson ## Colocated networks. defnet jump trusted addr 212.13.198.64/28 2001:ba8:0:1d9::/64 - forwards colohub + via colohub defnet colo trusted addr 172.29.199.176/28 2001:ba8:1d9:2::/64 - forwards colohub + via colohub defnet colohub virtual - forwards colobdry jump colo + via colobdry jump colo defnet colobdry virtual - forwards colohub hub - noxit jump + via colohub hub +defnet iodine untrusted + addr 172.29.198.128/28 + via colohub ## Colocated hosts. defhost fender @@ -128,8 +213,9 @@ defhost fender iface br-colo jump colo defhost precision hosttype router - iface eth0 jump colo sgo - iface eth1 jump colo sgo + 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 @@ -139,32 +225,58 @@ defhost telecaster defhost stratocaster iface eth0 jump colo iface eth1 jump colo +defhost jaguar + iface eth0 jump defhost jazz - iface eth0 jump colo - iface eth1 jump colo + hosttype router + iface eth0 jump colo vpn + iface eth1 jump colo vpn + iface dns0 iodine + iface vpn-+ vpn ## Other networks. defnet hub virtual - forwards housebdry colobdry + 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 - forwards househub colohub + via househub colohub defnet vpn safe addr 172.29.199.128/27 2001:ba8:1d9:6000::/64 - forwards househub colohub - host crybaby 1 - host terror 2 + 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 - forwards dmz unsafe safe untrusted jump colo vpn -defnet default untrusted + 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 - forwards dmz unsafe untrusted jump colo + 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 ###-------------------------------------------------------------------------- @@ -200,17 +312,10 @@ case $forward in -m state --state ESTABLISHED ## Allow SSH from safe/noloop to untrusted networks. - run iptables -A fwd-spec-nofrag -j ACCEPT \ + run ip46tables -A fwd-spec-nofrag -j ACCEPT \ -p tcp --destination-port $port_ssh \ -m mark --mark $to_untrusted/$MASK_TO - run iptables -A fwd-spec-nofrag -j ACCEPT \ - -p tcp --source-port $port_ssh \ - -m mark --mark $from_untrusted/$MASK_FROM \ - -m state --state ESTABLISHED - run ip6tables -A fwd-spec-nofrag -j ACCEPT \ - -p tcp --destination-port $port_ssh \ - -m mark --mark $to_untrusted/$MASK_TO - run ip6tables -A fwd-spec-nofrag -j ACCEPT \ + 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 @@ -265,8 +370,19 @@ 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