X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/blobdiff_plain/beb4f0eeafb386d83f2593fec489f4291583e08b..2b17ac87c0bbb773745e10a72fd2608bda8d0686:/local.m4 diff --git a/local.m4 b/local.m4 index 69122e2..e083a64 100644 --- a/local.m4 +++ b/local.m4 @@ -35,10 +35,12 @@ m4_divert(-1) ## 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 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 @@ -47,22 +49,17 @@ m4_divert(26)m4_dnl ## House networks. defnet dmz trusted - addr 62.49.204.144/28 + addr 62.49.204.144/28 2001:470:1f09:1b98::/64 forwards unsafe untrusted defnet unsafe trusted - addr 172.29.199.0/25 + addr 172.29.199.0/25 2001:470:9740:1::/64 forwards househub defnet safe safe - addr 172.29.199.192/28 + addr 172.29.199.192/27 2001:470:9740:4001::/64 forwards househub defnet untrusted untrusted - addr 172.29.198.0/25 + addr 172.29.198.0/25 2001:470:9740:8001::/64 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 @@ -74,41 +71,50 @@ defnet housebdry virtual ## 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 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 - 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 artist - iface eth0 dmz - iface eth1 unsafe + hosttype router + iface eth0 dmz unsafe + iface eth1 dmz unsafe + iface eth3 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 untrusted + iface dns0 iodine + 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 gibson + hosttype client iface eth0 unsafe ## Colocated networks. defnet jump trusted - addr 212.13.198.64/28 + addr 212.13.198.64/28 2001:ba8:0:1d9::/64 forwards colohub defnet colo trusted - addr 172.29.199.176/28 + addr 172.29.199.176/28 2001:ba8:1d9:2::/64 forwards colohub defnet colohub virtual forwards colobdry jump colo @@ -118,79 +124,93 @@ defnet colobdry virtual ## 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 sgo + iface eth1 jump colo sgo + iface vpn-radius housebdry vpn sgo + iface vpn-chiark sgo 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 + 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 - addr 212.13.198.64/28 - forwards dmz untrusted unsafe jump colo + 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. -## 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 iptables -A FORWARD -j fwd-spec-nofrag +case $forward in + 1) -## 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 ipv6-icmp --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 \ - -m mark --mark $from_untrusted/$MASK_FROM \ - -m state --state ESTABLISHED + ## 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 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 \ - -p tcp --destination-port $port_ssh \ - -m mark --mark $to_untrusted/$MASK_TO -run ip6tables -A fwd-spec-nofrag -j ACCEPT \ - -p tcp --source-port $port_ssh \ - -m mark --mark $from_untrusted/$MASK_FROM \ - -m state --state ESTABLISHED + ## 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(60)m4_dnl m4_divert(80)m4_dnl ###-------------------------------------------------------------------------- ### Kill things we don't understand properly. @@ -201,10 +221,14 @@ m4_divert(80)m4_dnl errorchain poorly-understood REJECT ## Ban multicast destination addresses in forwarding. -run iptables -A FORWARD -g poorly-understood \ - -d 224.0.0.0/4 -run ip6tables -A FORWARD -g poorly-understood \ - -d ff::/8 +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 ###-------------------------------------------------------------------------- @@ -225,22 +249,6 @@ 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 @@ -253,7 +261,7 @@ 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 +for i in $inchains; do run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT done