X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/blobdiff_plain/78af294cd1005453cf8b7a0dda4593ba101b345e..8670c87d52da8c68fa8fb99ff1d4976d4a72675a:/local.m4 diff --git a/local.m4 b/local.m4 index b31b649..074bf16 100644 --- a/local.m4 +++ b/local.m4 @@ -33,12 +33,95 @@ 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 untrusted untrusted trusted -defnetclass trusted untrusted trusted safe noloop -defnetclass safe trusted safe noloop -defnetclass noloop trusted safe +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 @@ -47,102 +130,165 @@ m4_divert(26)m4_dnl ## House networks. defnet dmz trusted - addr 62.49.204.144/28 - forwards unsafe untrusted + addr 62.49.204.144/28 2001:470:1f09:1b98::/64 + via unsafe untrusted defnet unsafe trusted - addr 172.29.199.0/25 - forwards househub + addr 172.29.199.0/25 2001:470:9740:1::/64 + via househub defnet safe safe - addr 172.29.199.192/28 - forwards househub + addr 172.29.199.192/27 2001:470:9740:4001::/64 + via househub defnet untrusted untrusted - addr 172.29.198.0/25 - forwards househub -defnet vpn safe - addr 172.29.199.128/27 - forwards househub - host crybaby 1 - host terror 2 -defnet iodine untrusted - addr 172.29.198.128/28 + addr 172.29.198.0/25 2001:470:9740:8001::/64 + 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 - router - iface eth0 dmz - iface eth1 unsafe - iface eth2 safe - iface eth3 untrusted + 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 - iface eth1 unsafe + iface eth0 dmz unsafe + iface eth1 dmz unsafe defhost jem - iface eth0 dmz - iface eth1 unsafe + iface eth0 dmz unsafe + iface eth1 dmz unsafe +defhost universe + iface eth0 dmz unsafe + iface eth1 dmz unsafe defhost artist - iface eth0 dmz - iface eth1 unsafe + hosttype router + iface eth0 dmz unsafe untrusted + iface eth1 dmz unsafe untrusted + iface eth3 unsafe untrusted defhost vampire - router - iface eth0.0 dmz - iface eth0.1 unsafe - iface eth0.3 untrusted - iface dns0 dns + 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 - iface vpn-precision colobdry vpn defhost ibanez - iface br-dmz dmz + 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 - iface eth0 unsafe + hosttype client + iface eth0.5 unsafe ## Colocated networks. defnet jump trusted - addr 212.13.198.64/28 - forwards colohub + addr 212.13.198.64/28 2001:ba8:0:1d9::/64 + via colohub defnet colo trusted - addr 172.29.199.176/28 - forwards colohub + addr 172.29.199.176/28 2001:ba8:1d9:2::/64 + 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 - iface br-jump jump - iface br-colo colo + iface br-jump jump colo + iface br-colo jump colo defhost precision - router - iface eth0 jump - iface eth1 colo + 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 - iface vpn-vampire housebdry vpn defhost telecaster - iface eth0 jump - iface eth1 colo + iface eth0 jump colo + iface eth1 jump colo defhost stratocaster - iface eth0 jump - iface eth1 colo + iface eth0 jump colo + iface eth1 jump colo defhost jazz - iface eth0 jump - iface eth1 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 -defnet default untrusted - addr 62.49.204.144/28 - addr 212.13.198.64/28 - forwards dmz untrusted unsafe jump colo + 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 ###-------------------------------------------------------------------------- @@ -159,7 +305,7 @@ case $forward in run iptables -A fwd-spec-nofrag -j RETURN --fragment run ip6tables -A fwd-spec-nofrag -j RETURN \ -m ipv6header --soft --header frag - run iptables -A FORWARD -j fwd-spec-nofrag + run ip46tables -A FORWARD -j fwd-spec-nofrag ## Allow ping from safe/noloop to untrusted networks. run iptables -A fwd-spec-nofrag -j ACCEPT \ @@ -170,25 +316,18 @@ case $forward in -m mark --mark $from_untrusted/$MASK_FROM \ -m state --state ESTABLISHED run ip6tables -A fwd-spec-nofrag -j ACCEPT \ - -p ipv6-icmp --icmpv6-type echo-request \ + -p icmpv6 --icmpv6-type echo-request \ -m mark --mark $to_untrusted/$MASK_TO run ip6tables -A fwd-spec-nofrag -j ACCEPT \ - -p ipv6-icmp --icmpv6-type echo-reply \ + -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 iptables -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 \ + run ip46tables -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 @@ -234,24 +373,9 @@ run iptables -A inbound -j ACCEPT \ -s 172.29.198.0/23 \ -p udp --source-port $port_bootpc --destination-port $port_bootps -## Incoming multicast on a network interface associated with a trusted -## network is OK, since it must have originated there (or been forwarded, but -## we don't do that yet). -for i in $(echo $if_trusted $if_dmz $if_safe | sed 'y/,/ /'); do - echo $i -done | { - seen=: - while read i; do - case "$seen" in *:$i:*) continue ;; esac - seen=$seen$i: - run iptables -A inbound -j ACCEPT \ - -s 0.0.0.0 -d 224.0.0.0/24 \ - -i $i - done -} - ## Allow incoming ping. This is the only ICMP left. -run ip46tables -A inbound -j ACCEPT -p icmp +run iptables -A inbound -j ACCEPT -p icmp +run ip6tables -A inbound -j ACCEPT -p icmpv6 m4_divert(88)m4_dnl ## Allow unusual things. @@ -259,15 +383,23 @@ 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 -## Otherwise process as indicated by the mark. -run ip46tables -A INPUT -m mark ! --mark 0/$MASK_MASK -j ACCEPT +## Allow responses from the scary outside world into the untrusted net, but +## don't let untrusted things run services. case $forward in 1) - run ip46tables -A FORWARD -m mark ! --mark 0/$MASK_MASK -j ACCEPT + 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 --------------------------------------------------