mdw@git.distorted.org.uk Git - firewall/blob - local.m4

   1 ### -*-sh-*-
   2 ###
   3 ### Local firewall configuration
   4 ###
   5 ### (c) 2008 Mark Wooding
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This program is free software; you can redistribute it and/or modify
  11 ### it under the terms of the GNU General Public License as published by
  12 ### the Free Software Foundation; either version 2 of the License, or
  13 ### (at your option) any later version.
  14 ###
  15 ### This program is distributed in the hope that it will be useful,
  16 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ### GNU General Public License for more details.
  19 ###
  20 ### You should have received a copy of the GNU General Public License
  21 ### along with this program; if not, write to the Free Software Foundation,
  22 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23
  24 ###--------------------------------------------------------------------------
  25 ### Local configuration.
  26
  27 m4_divert(6)m4_dnl
  28 ## Default NTP servers.
  29 defconf(ntp_servers,
  30         "158.152.1.76 158.152.1.204 194.159.253.2 195.173.57.232")
  31
  32 m4_divert(-1)
  33 ###--------------------------------------------------------------------------
  34 ### Packet classification.
  35
  36 ## Define the available network classes.
  37 m4_divert(42)m4_dnl
  38 defnetclass untrusted untrusted trusted mcast
  39 defnetclass trusted untrusted trusted safe noloop mcast
  40 defnetclass safe trusted safe noloop mcast
  41 defnetclass noloop trusted safe mcast
  42 defnetclass link
  43 defnetclass mcast
  44 m4_divert(-1)
  45
  46 m4_divert(26)m4_dnl
  47 ###--------------------------------------------------------------------------
  48 ### Network layout.
  49
  50 ## House networks.
  51 defnet dmz trusted
  52         addr 62.49.204.144/28 2001:470:1f09:1b98::/64
  53         forwards unsafe untrusted
  54 defnet unsafe trusted
  55         addr 172.29.199.0/25 2001:470:9740:1::/64
  56         forwards househub
  57 defnet safe safe
  58         addr 172.29.199.192/27 2001:470:9740:4001::/64
  59         forwards househub
  60 defnet untrusted untrusted
  61         addr 172.29.198.0/25 2001:470:9740:8001::/64
  62         forwards househub
  63 defnet iodine untrusted
  64         addr 172.29.198.128/28
  65
  66 defnet househub virtual
  67         forwards housebdry dmz unsafe safe untrusted
  68 defnet housebdry virtual
  69         forwards househub hub
  70         noxit dmz
  71
  72 ## House hosts.
  73 defhost radius
  74         hosttype router
  75         iface eth0 dmz unsafe safe untrusted vpn sgo colobdry default
  76         iface eth1 dmz unsafe safe untrusted vpn sgo colobdry default
  77         iface eth2 dmz unsafe safe untrusted vpn sgo colobdry
  78         iface eth3 untrusted vpn default
  79         iface t6-he default
  80         iface vpn-precision colobdry vpn sgo
  81         iface vpn-chiark sgo
  82         iface vpn-+ vpn
  83 defhost roadstar
  84         iface eth0 dmz unsafe
  85         iface eth1 dmz unsafe
  86 defhost jem
  87         iface eth0 dmz unsafe
  88         iface eth1 dmz unsafe
  89 defhost artist
  90         hosttype router
  91         iface eth0 dmz unsafe
  92         iface eth1 dmz unsafe
  93         iface eth3 untrusted
  94 defhost vampire
  95         hosttype router
  96         iface eth0.0 dmz unsafe untrusted safe vpn sgo colobdry
  97         iface eth0.1 dmz unsafe untrusted safe vpn sgo colobdry
  98         iface eth0.2 dmz unsafe safe untrusted vpn sgo colobdry
  99         iface eth0.3 untrusted
 100         iface dns0 iodine
 101         iface vpn-precision colobdry vpn sgo
 102         iface vpn-chiark sgo
 103         iface vpn-+ vpn
 104 defhost ibanez
 105         iface br-dmz dmz unsafe
 106         iface br-unsafe unsafe
 107
 108 defhost gibson
 109         hosttype client
 110         iface eth0 unsafe
 111
 112 ## Colocated networks.
 113 defnet jump trusted
 114         addr 212.13.198.64/28 2001:ba8:0:1d9::/64
 115         forwards colohub
 116 defnet colo trusted
 117         addr 172.29.199.176/28 2001:ba8:1d9:2::/64
 118         forwards colohub
 119 defnet colohub virtual
 120         forwards colobdry jump colo
 121 defnet colobdry virtual
 122         forwards colohub hub
 123         noxit jump
 124
 125 ## Colocated hosts.
 126 defhost fender
 127         iface br-jump jump colo
 128         iface br-colo jump colo
 129 defhost precision
 130         hosttype router
 131         iface eth0 jump colo sgo
 132         iface eth1 jump colo sgo
 133         iface vpn-radius housebdry vpn sgo
 134         iface vpn-chiark sgo
 135         iface vpn-+ vpn
 136 defhost telecaster
 137         iface eth0 jump colo
 138         iface eth1 jump colo
 139 defhost stratocaster
 140         iface eth0 jump colo
 141         iface eth1 jump colo
 142 defhost jazz
 143         iface eth0 jump colo
 144         iface eth1 jump colo
 145
 146 ## Other networks.
 147 defnet hub virtual
 148         forwards housebdry colobdry
 149 defnet sgo noloop
 150         addr !172.29.198.0/23
 151         addr 10.0.0.0/8
 152         addr 172.16.0.0/12
 153         addr 192.168.0.0/16
 154         forwards househub colohub
 155 defnet vpn safe
 156         addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
 157         forwards househub colohub
 158         host crybaby 1
 159         host terror 2
 160 defnet anycast trusted
 161         addr 172.29.199.224/27 2001:ba8:1d9:0::/64
 162         forwards dmz unsafe safe untrusted jump colo vpn
 163 defnet default untrusted
 164         addr 62.49.204.144/28 2001:470:1f09:1b98::/64
 165         addr 212.13.198.64/28 2001:ba8:0:1d9::/64
 166         addr 2001:ba8:1d9::/48 #temporary
 167         forwards dmz unsafe untrusted jump colo
 168
 169 m4_divert(80)m4_dnl
 170 ###--------------------------------------------------------------------------
 171 ### Special forwarding exemptions.
 172
 173 case $forward in
 174   1)
 175
 176     ## Only allow these packets if they're not fragmented.  (Don't trust safe
 177     ## hosts's fragment reassembly to be robust against malicious fragments.)
 178     ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
 179     ## of `! -f', so we do the negation using early return from a subchain.
 180     clearchain fwd-spec-nofrag
 181     run iptables -A fwd-spec-nofrag -j RETURN --fragment
 182     run ip6tables -A fwd-spec-nofrag -j RETURN \
 183             -m ipv6header --soft --header frag
 184     run ip46tables -A FORWARD -j fwd-spec-nofrag
 185
 186     ## Allow ping from safe/noloop to untrusted networks.
 187     run iptables -A fwd-spec-nofrag -j ACCEPT \
 188             -p icmp --icmp-type echo-request \
 189             -m mark --mark $to_untrusted/$MASK_TO
 190     run iptables -A fwd-spec-nofrag -j ACCEPT \
 191             -p icmp --icmp-type echo-reply \
 192             -m mark --mark $from_untrusted/$MASK_FROM \
 193             -m state --state ESTABLISHED
 194     run ip6tables -A fwd-spec-nofrag -j ACCEPT \
 195             -p icmpv6 --icmpv6-type echo-request \
 196             -m mark --mark $to_untrusted/$MASK_TO
 197     run ip6tables -A fwd-spec-nofrag -j ACCEPT \
 198             -p icmpv6 --icmpv6-type echo-reply \
 199             -m mark --mark $from_untrusted/$MASK_FROM \
 200             -m state --state ESTABLISHED
 201
 202     ## Allow SSH from safe/noloop to untrusted networks.
 203     run ip46tables -A fwd-spec-nofrag -j ACCEPT \
 204             -p tcp --destination-port $port_ssh \
 205             -m mark --mark $to_untrusted/$MASK_TO
 206     run ip46tables -A fwd-spec-nofrag -j ACCEPT \
 207             -p tcp --source-port $port_ssh \
 208             -m mark --mark $from_untrusted/$MASK_FROM \
 209             -m state --state ESTABLISHED
 210
 211     ;;
 212 esac
 213
 214 m4_divert(80)m4_dnl
 215 ###--------------------------------------------------------------------------
 216 ### Kill things we don't understand properly.
 217 ###
 218 ### I don't like having to do this, but since I don't know how to do proper
 219 ### multicast filtering, I'm just going to ban it from being forwarded.
 220
 221 errorchain poorly-understood REJECT
 222
 223 ## Ban multicast destination addresses in forwarding.
 224 case $forward in
 225   1)
 226     run iptables -A FORWARD -g poorly-understood \
 227             -d 224.0.0.0/4
 228     run ip6tables -A FORWARD -g poorly-understood \
 229             -d ff::/8
 230     ;;
 231 esac
 232
 233 m4_divert(84)m4_dnl
 234 ###--------------------------------------------------------------------------
 235 ### Locally-bound packet inspection.
 236
 237 clearchain inbound
 238
 239 ## Track connections.
 240 commonrules inbound
 241 conntrack inbound
 242
 243 ## Allow incoming bootp.  Bootp won't be forwarded, so this is obviously a
 244 ## local request.
 245 run iptables -A inbound -j ACCEPT \
 246         -s 0.0.0.0 -d 255.255.255.255 \
 247         -p udp --source-port $port_bootpc --destination-port $port_bootps
 248 run iptables -A inbound -j ACCEPT \
 249         -s 172.29.198.0/23 \
 250         -p udp --source-port $port_bootpc --destination-port $port_bootps
 251
 252 ## Allow incoming ping.  This is the only ICMP left.
 253 run ip46tables -A inbound -j ACCEPT -p icmp
 254
 255 m4_divert(88)m4_dnl
 256 ## Allow unusual things.
 257 openports inbound
 258
 259 ## Inspect inbound packets from untrusted sources.
 260 run ip46tables -A inbound -j forbidden
 261 run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
 262
 263 ## Otherwise process as indicated by the mark.
 264 for i in $inchains; do
 265   run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
 266 done
 267
 268 m4_divert(-1)
 269 ###----- That's all, folks --------------------------------------------------