X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/blobdiff_plain/9ec5456a4f6eca55df651d06f319ad3169dfd50c..2b17ac87c0bbb773745e10a72fd2608bda8d0686:/local.m4 diff --git a/local.m4 b/local.m4 index 8e7bd1e..e083a64 100644 --- a/local.m4 +++ b/local.m4 @@ -1,4 +1,4 @@ -### -*-m4-*- +### -*-sh-*- ### ### Local firewall configuration ### @@ -22,59 +22,216 @@ ### 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. ## 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 -m4_divert(-1)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 link +defnetclass mcast +m4_divert(-1) +m4_divert(26)m4_dnl ###-------------------------------------------------------------------------- ### Network layout. -m4_divert(46)m4_dnl -## Networks and routing. - -defiface $if_trusted \ - trusted:172.29.199.0/26 \ - safe:172.29.199.64/27 \ - untrusted:default -defiface $if_untrusted \ - untrusted:172.29.198.0/25 -defvpn $if_vpn safe 172.29.199.128/27 \ - crybaby:172.29.199.129 \ - terror:172.29.199.130 -defiface $if_iodine untrusted:172.29.198.128/28 -defiface $if_its_mz safe:172.29.199.160/30 -defiface $if_its_pi safe:192.168.0.0/24 - -m4_divert(60)m4_dnl +## House networks. +defnet dmz trusted + addr 62.49.204.144/28 2001:470:1f09:1b98::/64 + forwards unsafe untrusted +defnet unsafe trusted + addr 172.29.199.0/25 2001:470:9740:1::/64 + forwards househub +defnet safe safe + addr 172.29.199.192/27 2001:470:9740:4001::/64 + forwards 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 + +defnet househub virtual + forwards housebdry dmz unsafe safe untrusted +defnet housebdry virtual + forwards househub hub + noxit dmz + +## 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 untrusted vpn 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 + iface eth1 dmz unsafe + iface eth3 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 untrusted + iface dns0 iodine + 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 gibson + hosttype client + iface eth0 unsafe + +## Colocated networks. +defnet jump trusted + addr 212.13.198.64/28 2001:ba8:0:1d9::/64 + forwards colohub +defnet colo trusted + addr 172.29.199.176/28 2001:ba8:1d9:2::/64 + forwards colohub +defnet colohub virtual + forwards colobdry jump colo +defnet colobdry virtual + forwards colohub hub + noxit jump + +## Colocated hosts. +defhost fender + iface br-jump jump colo + iface br-colo jump colo +defhost precision + hosttype router + iface eth0 jump colo sgo + iface eth1 jump colo sgo + iface vpn-radius housebdry vpn sgo + iface vpn-chiark sgo + 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 + iface eth0 jump colo + iface eth1 jump colo + +## Other networks. +defnet hub virtual + forwards 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 +defnet vpn safe + addr 172.29.199.128/27 2001:ba8:1d9:6000::/64 + forwards househub colohub + host crybaby 1 + host terror 2 +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 + 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 + +m4_divert(80)m4_dnl ###-------------------------------------------------------------------------- ### Special forwarding exemptions. -## Allow ping from safe/noloop to untrusted networks. -run iptables -A FORWARD -j ACCEPT \ - -p icmp ! -f --icmp-type echo-request \ - -m mark --mark $to_untrusted/$MASK_TO -run iptables -A FORWARD -j ACCEPT \ - -p icmp ! -f --icmp-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 FORWARD -j ACCEPT \ - -p tcp ! -f --destination-port $port_ssh \ - -m mark --mark $to_untrusted/$MASK_TO -run iptables -A FORWARD -j ACCEPT \ - -p tcp ! -f --source-port $port_ssh \ - -m mark --mark $from_untrusted/$MASK_FROM \ - -m state --state ESTABLISHED +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 @@ -93,19 +250,19 @@ run iptables -A inbound -j ACCEPT \ -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 ip46tables -A inbound -j ACCEPT -p icmp m4_divert(88)m4_dnl ## Allow unusual things. openports inbound ## Inspect inbound packets from untrusted sources. -run iptables -A inbound -j forbidden -run iptables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound +run ip46tables -A inbound -j forbidden +run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound ## Otherwise process as indicated by the mark. -for i in INPUT FORWARD; do - run iptables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT +for i in $inchains; do + run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT done m4_divert(-1)