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 default
  76         iface eth1 dmz unsafe safe default
  77         iface eth2 safe
  78         iface eth3 untrusted default
  79         iface t6-he default
  80 defhost roadstar
  81         iface eth0 dmz unsafe
  82         iface eth1 dmz unsafe
  83 defhost jem
  84         iface eth0 dmz unsafe
  85         iface eth1 dmz unsafe
  86 defhost artist
  87         hosttype router
  88         iface eth0 dmz unsafe
  89         iface eth1 dmz unsafe
  90         iface eth3 untrusted
  91 defhost vampire
  92         hosttype router
  93         iface eth0.0 dmz unsafe safe
  94         iface eth0.1 dmz unsafe safe
  95         iface eth0.2 safe
  96         iface eth0.3 untrusted
  97         iface dns0 iodine
  98         iface vpn-precision colobdry vpn
  99         iface vpn-chiark sgo
 100         iface vpn-+ vpn
 101 defhost ibanez
 102         iface br-dmz dmz unsafe
 103         iface br-unsafe unsafe
 104
 105 defhost gibson
 106         hosttype client
 107         iface eth0 unsafe
 108
 109 ## Colocated networks.
 110 defnet jump trusted
 111         addr 212.13.198.64/28 2001:ba8:0:1d9::/64
 112         forwards colohub
 113 defnet colo trusted
 114         addr 172.29.199.176/28 2001:ba8:1d9:2::/64
 115         forwards colohub
 116 defnet colohub virtual
 117         forwards colobdry jump colo
 118 defnet colobdry virtual
 119         forwards colohub hub
 120         noxit jump
 121
 122 ## Colocated hosts.
 123 defhost fender
 124         iface br-jump jump colo
 125         iface br-colo jump colo
 126 defhost precision
 127         hosttype router
 128         iface eth0 jump colo
 129         iface eth1 jump colo
 130         iface vpn-vampire housebdry vpn
 131         iface vpn-chiark sgo
 132         iface vpn-+ vpn
 133 defhost telecaster
 134         iface eth0 jump colo
 135         iface eth1 jump colo
 136 defhost stratocaster
 137         iface eth0 jump colo
 138         iface eth1 jump colo
 139 defhost jazz
 140         iface eth0 jump colo
 141         iface eth1 jump colo
 142
 143 ## Other networks.
 144 defnet hub virtual
 145         forwards housebdry colobdry
 146 defnet sgo noloop
 147         addr !172.29.198.0/23
 148         addr 10.0.0.0/8
 149         addr 172.16.0.0/12
 150         addr 192.168.0.0/16
 151         forwards househub colohub
 152 defnet vpn safe
 153         addr 172.29.199.128/27 2001:ba8:1d9:6000::/64
 154         forwards househub colohub
 155         host crybaby 1
 156         host terror 2
 157 defnet anycast trusted
 158         addr 172.29.199.224/27 2001:ba8:1d9:0::/64
 159         forwards dmz unsafe safe untrusted jump colo vpn
 160 defnet default untrusted
 161         addr 62.49.204.144/28 2001:470:1f09:1b98::/64
 162         addr 212.13.198.64/28 2001:ba8:0:1d9::/64
 163         addr 2001:ba8:1d9::/48 #temporary
 164         forwards dmz unsafe untrusted jump colo
 165
 166 m4_divert(80)m4_dnl
 167 ###--------------------------------------------------------------------------
 168 ### Special forwarding exemptions.
 169
 170 case $forward in
 171   1)
 172
 173     ## Only allow these packets if they're not fragmented.  (Don't trust safe
 174     ## hosts's fragment reassembly to be robust against malicious fragments.)
 175     ## There's a hideous bug in iptables 1.4.11.1 which botches the meaning
 176     ## of `! -f', so we do the negation using early return from a subchain.
 177     clearchain fwd-spec-nofrag
 178     run iptables -A fwd-spec-nofrag -j RETURN --fragment
 179     run ip6tables -A fwd-spec-nofrag -j RETURN \
 180             -m ipv6header --soft --header frag
 181     run ip46tables -A FORWARD -j fwd-spec-nofrag
 182
 183     ## Allow ping from safe/noloop to untrusted networks.
 184     run iptables -A fwd-spec-nofrag -j ACCEPT \
 185             -p icmp --icmp-type echo-request \
 186             -m mark --mark $to_untrusted/$MASK_TO
 187     run iptables -A fwd-spec-nofrag -j ACCEPT \
 188             -p icmp --icmp-type echo-reply \
 189             -m mark --mark $from_untrusted/$MASK_FROM \
 190             -m state --state ESTABLISHED
 191     run ip6tables -A fwd-spec-nofrag -j ACCEPT \
 192             -p icmpv6 --icmpv6-type echo-request \
 193             -m mark --mark $to_untrusted/$MASK_TO
 194     run ip6tables -A fwd-spec-nofrag -j ACCEPT \
 195             -p icmpv6 --icmpv6-type echo-reply \
 196             -m mark --mark $from_untrusted/$MASK_FROM \
 197             -m state --state ESTABLISHED
 198
 199     ## Allow SSH from safe/noloop to untrusted networks.
 200     run iptables -A fwd-spec-nofrag -j ACCEPT \
 201             -p tcp --destination-port $port_ssh \
 202             -m mark --mark $to_untrusted/$MASK_TO
 203     run iptables -A fwd-spec-nofrag -j ACCEPT \
 204             -p tcp --source-port $port_ssh \
 205             -m mark --mark $from_untrusted/$MASK_FROM \
 206             -m state --state ESTABLISHED
 207     run ip6tables -A fwd-spec-nofrag -j ACCEPT \
 208             -p tcp --destination-port $port_ssh \
 209             -m mark --mark $to_untrusted/$MASK_TO
 210     run ip6tables -A fwd-spec-nofrag -j ACCEPT \
 211             -p tcp --source-port $port_ssh \
 212             -m mark --mark $from_untrusted/$MASK_FROM \
 213             -m state --state ESTABLISHED
 214
 215     ;;
 216 esac
 217
 218 m4_divert(80)m4_dnl
 219 ###--------------------------------------------------------------------------
 220 ### Kill things we don't understand properly.
 221 ###
 222 ### I don't like having to do this, but since I don't know how to do proper
 223 ### multicast filtering, I'm just going to ban it from being forwarded.
 224
 225 errorchain poorly-understood REJECT
 226
 227 ## Ban multicast destination addresses in forwarding.
 228 case $forward in
 229   1)
 230     run iptables -A FORWARD -g poorly-understood \
 231             -d 224.0.0.0/4
 232     run ip6tables -A FORWARD -g poorly-understood \
 233             -d ff::/8
 234     ;;
 235 esac
 236
 237 m4_divert(84)m4_dnl
 238 ###--------------------------------------------------------------------------
 239 ### Locally-bound packet inspection.
 240
 241 clearchain inbound
 242
 243 ## Track connections.
 244 commonrules inbound
 245 conntrack inbound
 246
 247 ## Allow incoming bootp.  Bootp won't be forwarded, so this is obviously a
 248 ## local request.
 249 run iptables -A inbound -j ACCEPT \
 250         -s 0.0.0.0 -d 255.255.255.255 \
 251         -p udp --source-port $port_bootpc --destination-port $port_bootps
 252 run iptables -A inbound -j ACCEPT \
 253         -s 172.29.198.0/23 \
 254         -p udp --source-port $port_bootpc --destination-port $port_bootps
 255
 256 ## Allow incoming ping.  This is the only ICMP left.
 257 run ip46tables -A inbound -j ACCEPT -p icmp
 258
 259 m4_divert(88)m4_dnl
 260 ## Allow unusual things.
 261 openports inbound
 262
 263 ## Inspect inbound packets from untrusted sources.
 264 run ip46tables -A inbound -j forbidden
 265 run ip46tables -A INPUT -m mark --mark $from_untrusted/$MASK_FROM -g inbound
 266
 267 ## Otherwise process as indicated by the mark.
 268 for i in $inchains; do
 269   run ip46tables -A $i -m mark ! --mark 0/$MASK_MASK -j ACCEPT
 270 done
 271
 272 m4_divert(-1)
 273 ###----- That's all, folks --------------------------------------------------