X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/blobdiff_plain/e66833d3112cbea68ae6dfedeb59158ebc6bacd5..HEAD:/local.m4 diff --git a/local.m4 b/local.m4 index 9d4d917..b0a1770 100644 --- a/local.m4 +++ b/local.m4 @@ -27,18 +27,82 @@ 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") + "81.187.26.174 90.155.23.205 2001:8b0:0:23::205 185.73.44.6 2001:ba8:0:2c06::") 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, 217.169.12.64/28 +## House border network (dmz). We have all of these; the loose +## address is for the router. +## +## 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 +## .144/28 hippotat (IP-over-HTTP) 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). +## +## 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. +## fff Local border network. + ## 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 vpnnat mcast +defnetclass untrusted scary untrusted trusted mcast +defnetclass trusted scary untrusted trusted safe noloop vpnnat mcast +defnetclass safe trusted safe noloop vpnnat mcast +defnetclass noloop trusted safe mcast +defnetclass vpnnat scary trusted safe mcast + +defnetclass link +defnetclass mcast m4_divert(-1) m4_divert(26)m4_dnl @@ -47,103 +111,167 @@ m4_divert(26)m4_dnl ## House networks. defnet dmz trusted - addr 62.49.204.144/28 - forwards unsafe untrusted + addr 81.2.113.195 81.187.238.128/28 217.169.12.64/28 2001:8b0:c92:fff::/64 + via unsafe untrusted defnet unsafe trusted - addr 172.29.199.0/25 - forwards househub + addr 172.29.199.0/25 2001:8b0:c92:1::/64 + via househub defnet safe safe - addr 172.29.199.192/28 - forwards househub + addr 172.29.199.192/27 2001:8b0:c92:4001::/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 colohub - host crybaby 1 - host terror 2 -defnet iodine untrusted - addr 172.29.198.128/28 + addr 172.29.198.0/25 2001:8b0:c92:8001::/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 unsafe safe - iface eth1 dmz unsafe safe - iface eth2 safe - iface eth3 untrusted + hosttype router + iface eth0 dmz unsafe safe untrusted vpn sgo default + iface eth1 dmz unsafe safe untrusted vpn sgo default + iface eth2 dmz unsafe safe untrusted vpn sgo + iface eth3 unsafe untrusted vpn default + iface ppp0 default + iface t6-he default + iface vpn-precision 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 +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 - router - iface eth0.0 dmz unsafe safe - iface eth0.1 dmz unsafe safe - iface eth0.2 safe - iface eth0.3 untrusted - iface dns0 dns + hosttype router + iface eth0.4 dmz unsafe untrusted safe vpn sgo + iface eth0.5 dmz unsafe untrusted safe vpn sgo + iface eth0.6 dmz unsafe safe untrusted vpn sgo + iface eth0.7 unsafe untrusted vpn + iface vpn-precision vpn sgo + iface vpn-chiark sgo iface vpn-+ vpn - iface vpn-precision colobdry 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 - forwards colohub -defnet colo trusted - addr 172.29.199.176/28 - forwards colohub -defnet colohub virtual - forwards colobdry jump colo -defnet colobdry virtual - forwards colohub hub - noxit jump - -## Colocated hosts. +## Formerly colocated hosts. defhost fender - iface br-jump jump colo - iface br-colo jump colo + iface br-dmz dmz unsafe + iface br-unsafe dmz unsafe defhost precision - router - iface eth0 jump colo - iface eth1 jump colo + hosttype router + iface eth0 dmz unsafe vpn sgo + iface eth1 dmz unsafe vpn sgo + iface vpn-mango binswood + iface vpn-chiark sgo + iface vpn-national upn + iface vpn-mdwdev upn + iface vpn-eggle upn iface vpn-+ vpn - iface vpn-vampire housebdry vpn defhost telecaster - iface eth0 jump colo - iface eth1 jump colo + iface eth0 dmz unsafe vpn sgo + iface eth1 dmz unsafe vpn sgo defhost stratocaster - iface eth0 jump colo - iface eth1 jump colo + iface eth0 dmz unsafe vpn sgo + iface eth1 dmz unsafe vpn sgo defhost jazz - iface eth0 jump colo - iface eth1 jump colo + hosttype router + iface eth0 dmz unsafe vpn sgo + iface eth1 dmz unsafe vpn sgo + iface dns0 iodine + iface hippo-svc hippotat + iface vpn-+ vpn + +## Stunt connectivity networks. +defnet iodine untrusted + addr 172.29.198.128/28 + via colohub +defnet hippotat untrusted + addr 172.29.198.144/28 + via colohub + ## 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 +defnet sgo noloop + addr !172.29.198.0/23 + addr !10.165.27.0/24 + addr 10.0.0.0/8 + addr 172.16.0.0/12 + addr 192.168.0.0/16 + via househub +defnet vpn trusted + addr 172.29.199.128/27 2001:8b0:c92:6000::/64 + via househub + host crybaby 1 ::1:1 + host terror 2 ::2:1 + host orange 3 ::3:1 + host haze 4 ::4:1 + host spirit 9 ::9:1 + host groove 10 ::10:1 +defnet anycast trusted + addr 172.29.199.224/27 2001:8b0:c92:0::/64 + via dmz unsafe safe untrusted vpn nvpn +defnet default scary + addr 81.2.113.195 81.187.238.128/28 217.169.12.64/28 \ + 2001:8b0:c92::/48 + via dmz unsafe untrusted +defnet upn untrusted + addr 172.29.198.160/27 2001:8b0:c92:a000::/64 + via househub + host national 1 ::1:1 + host mdwdev 2 ::2:1 + host eggle 3 ::3:1 + +## VPS hosts. +defhost eggle + iface eth0 default + iface vpn-precision househub +defhost national + iface eth0 default + iface vpn-precision househub + +## Satellite networks. +defnet binswood vpnnat + addr 10.165.27.0/24 + via househub +defhost mango + hosttype router + iface eth0 binswood default + iface vpn-precision dmz default + +m4_divert(80)m4_dnl +###-------------------------------------------------------------------------- +### Connection tracking helper modules. + +for i in ftp; do + modprobe nf_conntrack_$i +done m4_divert(80)m4_dnl ###-------------------------------------------------------------------------- @@ -160,7 +288,7 @@ 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 \ @@ -171,25 +299,18 @@ 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 \ + 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 @@ -216,11 +337,29 @@ case $forward in ;; esac +m4_divert(82)m4_dnl +###-------------------------------------------------------------------------- +### Check for source routing. + +clearchain check-srcroute + +run iptables -A check-srcroute -g forbidden \ + -m ipv4options --any --flags lsrr,ssrr +run ip6tables -A check-srcroute -g forbidden \ + -m rt + +for c in INPUT FORWARD; do + for m in $from_scary $from_untrusted; do + run ip46tables -A $c -m mark --mark $m/$MASK_FROM -j check-srcroute + done +done + m4_divert(84)m4_dnl ###-------------------------------------------------------------------------- ### Locally-bound packet inspection. clearchain inbound +clearchain inbound-untrusted ## Track connections. commonrules inbound @@ -235,40 +374,36 @@ 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). -seen=:-: -for net in $allnets; do - eval class=\$net_class_$net - case $class in trusted) ;; *) continue ;; esac - for iface in $(net_interfaces FWHOST $net); do - case "$seen" in *:$iface:*) continue ;; esac - seen=$seen$iface: - run iptables -A inbound -j ACCEPT \ - -s 0.0.0.0 -d 224.0.0.0/24 \ - -i $iface - done -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. openports inbound ## Inspect inbound packets from untrusted sources. -run ip46tables -A inbound -j forbidden +run iptables -A inbound -s 172.29.198.0/24 -g inbound-untrusted +run ip6tables -A inbound -s 2001:8b0:c92:8000::/49 -g inbound-untrusted +run ip46tables -A inbound-untrusted -g forbidden +run ip46tables -A inbound -g 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 --------------------------------------------------