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
  76         iface eth1 dmz unsafe safe
  77         iface eth2 safe
  78         iface eth3 untrusted
  79 defhost roadstar
  80         iface eth0 dmz unsafe
  81         iface eth1 dmz unsafe
  82 defhost jem
  83         iface eth0 dmz unsafe
  84         iface eth1 dmz unsafe
  85 defhost artist
  86         iface eth0 dmz unsafe
  87         iface eth1 dmz unsafe
  88 defhost vampire
  89         hosttype router
  90         iface eth0.0 dmz unsafe safe
  91         iface eth0.1 dmz unsafe safe
  92         iface eth0.2 safe
  93         iface eth0.3 untrusted
  94         iface dns0 iodine
  95         iface vpn-precision colobdry vpn
  96         iface vpn-chiark sgo
  97         iface vpn-+ vpn
  98 defhost ibanez
  99         iface br-dmz dmz unsafe
 100         iface br-unsafe unsafe
 101
 102 defhost gibson
 103         hosttype client
 104         iface eth0 unsafe
 105
 106 ## Colocated networks.
 107 defnet jump trusted
 108         addr 212.13.198.64/28 2001:ba8:0:1d9::/64
 109         forwards colohub
 110 defnet colo trusted
 111         addr 172.29.199.176/28 2001:ba8:1d9:2::/64
 112         forwards colohub
 113 defnet colohub virtual
 114         forwards colobdry jump colo
 115 defnet colobdry virtual
 116         forwards colohub hub
 117         noxit jump
 118
 119 ## Colocated hosts.
 120 defhost fender
 121         iface br-jump jump colo
 122         iface br-colo jump colo
 123 defhost precision
 124         hosttype router
 125         iface eth0 jump colo
 126         iface eth1 jump colo
 127         iface vpn-vampire housebdry vpn
 128         iface vpn-chiark sgo
 129         iface vpn-+ vpn
 130 defhost telecaster
 131         iface eth0 jump colo
 132         iface eth1 jump colo
 133 defhost stratocaster
 134         iface eth0 jump colo
 135         iface eth1 jump colo
 136 defhost jazz
 137         iface eth0 jump colo
 138         iface eth1 jump colo
 139
 140 ## Other networks.
 141 defnet hub virtual
 142         forwards housebdry colobdry
 143 defnet sgo noloop
 144         addr !172.29.198.0/23
 145         addr 10.0.0.0/8
 146         addr 172.16.0.0/12
 147         addr 192.168.0.0/16
 148         forwards househub colohub
 149 defnet vpn safe
 150         addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
 151         forwards househub colohub
 152         host crybaby 1
 153         host terror 2
 154 defnet anycast trusted
 155         addr 172.29.199.224/27 2001:ba8:1d9:0::/64
 156         forwards dmz unsafe safe untrusted jump colo vpn
 157 defnet default untrusted
 158         addr 62.49.204.144/28 2001:470:1f09:1b98::/64
 159         addr 212.13.198.64/28 2001:ba8:0:1d9::/64
 160         addr 2001:ba8:1d9::/48 #temporary
 161         forwards dmz unsafe untrusted jump colo
 162
 163 m4_divert(80)m4_dnl
 164 ###--------------------------------------------------------------------------
 165 ### Special forwarding exemptions.
 166
 167 case $forward in
 168   1)
 169
 170     ## Only allow these packets if they're not fragmented.  (Don't trust safe
 171     ## hosts's fragment reassembly to be robust against malicious fragments.)
 172     ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
 173     ## of `! -f', so we do the negation using early return from a subchain.
 174     clearchain fwd-spec-nofrag
 175     run iptables -A fwd-spec-nofrag -j RETURN --fragment
 176     run ip6tables -A fwd-spec-nofrag -j RETURN \
 177             -m ipv6header --soft --header frag
 178     run ip46tables -A FORWARD -j fwd-spec-nofrag
 179
 180     ## Allow ping from safe/noloop to untrusted networks.
 181     run iptables -A fwd-spec-nofrag -j ACCEPT \
 182             -p icmp --icmp-type echo-request \
 183             -m mark --mark $to_untrusted/$MASK_TO
 184     run iptables -A fwd-spec-nofrag -j ACCEPT \
 185             -p icmp --icmp-type echo-reply \
 186             -m mark --mark $from_untrusted/$MASK_FROM \
 187             -m state --state ESTABLISHED
 188     run ip6tables -A fwd-spec-nofrag -j ACCEPT \
 189             -p icmpv6 --icmpv6-type echo-request \
 190             -m mark --mark $to_untrusted/$MASK_TO
 191     run ip6tables -A fwd-spec-nofrag -j ACCEPT \
 192             -p icmpv6 --icmpv6-type echo-reply \
 193             -m mark --mark $from_untrusted/$MASK_FROM \
 194             -m state --state ESTABLISHED
 195
 196     ## Allow SSH from safe/noloop to untrusted networks.
 197     run iptables -A fwd-spec-nofrag -j ACCEPT \
 198             -p tcp --destination-port $port_ssh \
 199             -m mark --mark $to_untrusted/$MASK_TO
 200     run iptables -A fwd-spec-nofrag -j ACCEPT \
 201             -p tcp --source-port $port_ssh \
 202             -m mark --mark $from_untrusted/$MASK_FROM \
 203             -m state --state ESTABLISHED
 204     run ip6tables -A fwd-spec-nofrag -j ACCEPT \
 205             -p tcp --destination-port $port_ssh \
 206             -m mark --mark $to_untrusted/$MASK_TO
 207     run ip6tables -A fwd-spec-nofrag -j ACCEPT \
 208             -p tcp --source-port $port_ssh \
 209             -m mark --mark $from_untrusted/$MASK_FROM \
 210             -m state --state ESTABLISHED
 211
 212     ;;
 213 esac
 214
 215 m4_divert(80)m4_dnl
 216 ###--------------------------------------------------------------------------
 217 ### Kill things we don't understand properly.
 218 ###
 219 ### I don't like having to do this, but since I don't know how to do proper
 220 ### multicast filtering, I'm just going to ban it from being forwarded.
 221
 222 errorchain poorly-understood REJECT
 223
 224 ## Ban multicast destination addresses in forwarding.
 225 case $forward in
 226   1)
 227     run iptables -A FORWARD -g poorly-understood \
 228             -d 224.0.0.0/4
 229     run ip6tables -A FORWARD -g poorly-understood \
 230             -d ff::/8
 231     ;;
 232 esac
 233
 234 m4_divert(84)m4_dnl
 235 ###--------------------------------------------------------------------------
 236 ### Locally-bound packet inspection.
 237
 238 clearchain inbound
 239
 240 ## Track connections.
 241 commonrules inbound
 242 conntrack inbound
 243
 244 ## Allow incoming bootp.  Bootp won't be forwarded, so this is obviously a
 245 ## local request.
 246 run iptables -A inbound -j ACCEPT \
 247         -s 0.0.0.0 -d 255.255.255.255 \
 248         -p udp --source-port $port_bootpc --destination-port $port_bootps
 249 run iptables -A inbound -j ACCEPT \
 250         -s 172.29.198.0/23 \
 251         -p udp --source-port $port_bootpc --destination-port $port_bootps
 252
 253 ## Allow incoming ping.  This is the only ICMP left.
 254 run ip46tables -A inbound -j ACCEPT -p icmp
 255
 256 m4_divert(88)m4_dnl
 257 ## Allow unusual things.
 258 openports inbound
 259
 260 ## Inspect inbound packets from untrusted sources.
 261 run ip46tables -A inbound -j forbidden
 262 run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
 263
 264 ## Otherwise process as indicated by the mark.
 265 for i in $inchains; do
 266   run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
 267 done
 268
 269 m4_divert(-1)
 270 ###----- That's all, folks --------------------------------------------------