etc/rc.firewall6

   1 #!/bin/sh -
   2 ############
   3 # Setup system for IPv6 firewall service.
   4 # $FreeBSD$
   5
   6 # Suck in the configuration variables.
   7 if [ -z "${source_rc_confs_defined}" ]; then
   8         if [ -r /etc/defaults/rc.conf ]; then
   9                 . /etc/defaults/rc.conf
  10                 source_rc_confs
  11         elif [ -r /etc/rc.conf ]; then
  12                 . /etc/rc.conf
  13         fi
  14 fi
  15
  16 ############
  17 # Define the firewall type in /etc/rc.conf.  Valid values are:
  18 #   open     - will allow anyone in
  19 #   client   - will try to protect just this machine
  20 #   simple   - will try to protect a whole network
  21 #   closed   - totally disables IP services except via lo0 interface
  22 #   UNKNOWN  - disables the loading of firewall rules.
  23 #   filename - will load the rules in the given filename (full path required)
  24 #
  25 # For ``client'' and ``simple'' the entries below should be customized
  26 # appropriately.
  27
  28 ############
  29 #
  30 # If you don't know enough about packet filtering, we suggest that you
  31 # take time to read this book:
  32 #
  33 #       Building Internet Firewalls, 2nd Edition
  34 #       Brent Chapman and Elizabeth Zwicky
  35 #
  36 #       O'Reilly & Associates, Inc
  37 #       ISBN 1-56592-871-7
  38 #       http://www.ora.com/
  39 #       http://www.oreilly.com/catalog/fire2/
  40 #
  41 # For a more advanced treatment of Internet Security read:
  42 #
  43 #       Firewalls and Internet Security: Repelling the Wily Hacker, 2nd Edition
  44 #       William R. Cheswick, Steven M. Bellowin, Aviel D. Rubin
  45 #
  46 #       Addison-Wesley / Prentice Hall
  47 #       ISBN 0-201-63466-X
  48 #       http://www.pearsonhighered.com/
  49 #       http://www.pearsonhighered.com/educator/academic/product/0,3110,020163466X,00.html
  50 #
  51
  52 setup_local () {
  53         ############
  54         # Only in rare cases do you want to change these rules
  55         #
  56         ${fw6cmd} add 100 pass ip6 from any to any via lo0
  57         ${fw6cmd} add 200 deny ip6 from any to ::1
  58         ${fw6cmd} add 300 deny ip6 from ::1 to any
  59         #
  60         # ND
  61         #
  62         # DAD
  63         ${fw6cmd} add pass ip6 from :: to ff02::/16 proto ipv6-icmp
  64         # RS, RA, NS, NA, redirect...
  65         ${fw6cmd} add pass ip6 from fe80::/10 to fe80::/10 proto ipv6-icmp
  66         ${fw6cmd} add pass ip6 from fe80::/10 to ff02::/16 proto ipv6-icmp
  67 }
  68
  69 if [ -n "${1}" ]; then
  70         ipv6_firewall_type="${1}"
  71 fi
  72
  73 ############
  74 # Set quiet mode if requested
  75 #
  76 case ${ipv6_firewall_quiet} in
  77 [Yy][Ee][Ss])
  78         fw6cmd="/sbin/ipfw -q"
  79         ;;
  80 *)
  81         fw6cmd="/sbin/ipfw"
  82         ;;
  83 esac
  84
  85 ############
  86 # Flush out the list before we begin.
  87 #
  88 ${fw6cmd} -f flush
  89
  90 ############
  91 # If you just configured ipfw in the kernel as a tool to solve network
  92 # problems or you just want to disallow some particular kinds of traffic
  93 # then you will want to change the default policy to open.  You can also
  94 # do this as your only action by setting the ipv6_firewall_type to ``open''.
  95 #
  96 # ${fw6cmd} add 65000 pass all from any to any
  97
  98
  99 # Prototype setups.
 100 #
 101 case ${ipv6_firewall_type} in
 102 [Oo][Pp][Ee][Nn])
 103         setup_local
 104         ${fw6cmd} add 65000 pass ip6 from any to any
 105         ;;
 106
 107 [Cc][Ll][Ii][Ee][Nn][Tt])
 108         ############
 109         # This is a prototype setup that will protect your system somewhat
 110         # against people from outside your own network.
 111         ############
 112
 113         # set these to your network and prefixlen and ip
 114         #
 115         # This needs more work
 116         #
 117         net="2001:db8:2:1::"
 118         prefixlen="64"
 119         ip="2001:db8:2:1::1"
 120
 121         setup_local
 122
 123         # Allow any traffic to or from my own net.
 124         ${fw6cmd} add pass ip6 from ${ip} to ${net}/${prefixlen}
 125         ${fw6cmd} add pass ip6 from ${net}/${prefixlen} to ${ip}
 126
 127         # Allow any link-local multicast traffic
 128         ${fw6cmd} add pass ip6 from fe80::/10 to ff02::/16
 129         ${fw6cmd} add pass ip6 from ${net}/${prefixlen} to ff02::/16
 130
 131         # Allow TCP through if setup succeeded
 132         ${fw6cmd} add pass ip6 from any to any established proto tcp
 133
 134         # Allow IP fragments to pass through
 135         ${fw6cmd} add pass ip6 from any to any frag
 136
 137         # Allow setup of incoming email
 138         ${fw6cmd} add pass ip6 from any to ${ip} 25 setup proto tcp
 139
 140         # Allow setup of outgoing TCP connections only
 141         ${fw6cmd} add pass ip6 from ${ip} to any setup proto tcp
 142
 143         # Disallow setup of all other TCP connections
 144         ${fw6cmd} add deny ip6 from any to any setup proto tcp
 145
 146         # Allow DNS queries out in the world
 147         ${fw6cmd} add pass ip6 from any 53 to ${ip} proto udp
 148         ${fw6cmd} add pass ip6 from ${ip} to any 53 proto udp
 149
 150         # Allow NTP queries out in the world
 151         ${fw6cmd} add pass ip6 from any 123 to ${ip} proto udp
 152         ${fw6cmd} add pass ip6 from ${ip} to any 123 proto udp
 153
 154         # Allow ICMPv6 destination unreach
 155         ${fw6cmd} add pass ip6 from any to any icmp6types 1 proto ipv6-icmp
 156
 157         # Allow NS/NA/toobig (don't filter it out)
 158         ${fw6cmd} add pass ip6 from any to any icmp6types 2,135,136 \
 159             proto ipv6-icmp
 160
 161         # Everything else is denied by default, unless the
 162         # IPV6FIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
 163         # config file.
 164         ;;
 165
 166 [Ss][Ii][Mm][Pp][Ll][Ee])
 167         ############
 168         # This is a prototype setup for a simple firewall.  Configure this
 169         # machine as a DNS and NTP server, and point all the machines
 170         # on the inside at this machine for those services.
 171         ############
 172
 173         # set these to your outside interface network and prefixlen and ip
 174         oif="ed0"
 175         onet="2001:db8:2:1::"
 176         oprefixlen="64"
 177         oip="2001:db8:2:1::1"
 178
 179         # set these to your inside interface network and prefixlen and ip
 180         iif="ed1"
 181         inet="2001:db8:2:2::"
 182         iprefixlen="64"
 183         iip="2001:db8:2:2::1"
 184
 185         setup_local
 186
 187         # Stop spoofing
 188         ${fw6cmd} add deny ip6 from ${inet}/${iprefixlen} to any in via ${oif}
 189         ${fw6cmd} add deny ip6 from ${onet}/${oprefixlen} to any in via ${iif}
 190
 191         # Stop unique local unicast address on the outside interface
 192         ${fw6cmd} add deny ip6 from fc00::/7 to any via ${oif}
 193         ${fw6cmd} add deny ip6 from any to fc00::/7 via ${oif}
 194
 195         # Stop site-local on the outside interface
 196         ${fw6cmd} add deny ip6 from fec0::/10 to any via ${oif}
 197         ${fw6cmd} add deny ip6 from any to fec0::/10 via ${oif}
 198
 199         # Disallow "internal" addresses to appear on the wire.
 200         ${fw6cmd} add deny ip6 from ::ffff:0.0.0.0/96 to any via ${oif}
 201         ${fw6cmd} add deny ip6 from any to ::ffff:0.0.0.0/96 via ${oif}
 202
 203         # Disallow packets to malicious IPv4 compatible prefix.
 204         ${fw6cmd} add deny ip6 from ::224.0.0.0/100 to any via ${oif}
 205         ${fw6cmd} add deny ip6 from any to ::224.0.0.0/100 via ${oif}
 206         ${fw6cmd} add deny ip6 from ::127.0.0.0/104 to any via ${oif}
 207         ${fw6cmd} add deny ip6 from any to ::127.0.0.0/104 via ${oif}
 208         ${fw6cmd} add deny ip6 from ::0.0.0.0/104 to any via ${oif}
 209         ${fw6cmd} add deny ip6 from any to ::0.0.0.0/104 via ${oif}
 210         ${fw6cmd} add deny ip6 from ::255.0.0.0/104 to any via ${oif}
 211         ${fw6cmd} add deny ip6 from any to ::255.0.0.0/104 via ${oif}
 212
 213         ${fw6cmd} add deny ip6 from ::0.0.0.0/96 to any via ${oif}
 214         ${fw6cmd} add deny ip6 from any to ::0.0.0.0/96 via ${oif}
 215
 216         # Disallow packets to malicious 6to4 prefix.
 217         ${fw6cmd} add deny ip6 from 2002:e000::/20 to any via ${oif}
 218         ${fw6cmd} add deny ip6 from any to 2002:e000::/20 via ${oif}
 219         ${fw6cmd} add deny ip6 from 2002:7f00::/24 to any via ${oif}
 220         ${fw6cmd} add deny ip6 from any to 2002:7f00::/24 via ${oif}
 221         ${fw6cmd} add deny ip6 from 2002:0000::/24 to any via ${oif}
 222         ${fw6cmd} add deny ip6 from any to 2002:0000::/24 via ${oif}
 223         ${fw6cmd} add deny ip6 from 2002:ff00::/24 to any via ${oif}
 224         ${fw6cmd} add deny ip6 from any to 2002:ff00::/24 via ${oif}
 225
 226         ${fw6cmd} add deny ip6 from 2002:0a00::/24 to any via ${oif}
 227         ${fw6cmd} add deny ip6 from any to 2002:0a00::/24 via ${oif}
 228         ${fw6cmd} add deny ip6 from 2002:ac10::/28 to any via ${oif}
 229         ${fw6cmd} add deny ip6 from any to 2002:ac10::/28 via ${oif}
 230         ${fw6cmd} add deny ip6 from 2002:c0a8::/32 to any via ${oif}
 231         ${fw6cmd} add deny ip6 from any to 2002:c0a8::/32 via ${oif}
 232
 233         ${fw6cmd} add deny ip6 from ff05::/16 to any via ${oif}
 234         ${fw6cmd} add deny ip6 from any to ff05::/16 via ${oif}
 235
 236         # Allow TCP through if setup succeeded
 237         ${fw6cmd} add pass tcp from any to any established
 238
 239         # Allow IP fragments to pass through
 240         ${fw6cmd} add pass ip6 from any to any frag
 241
 242         # Allow setup of incoming email
 243         ${fw6cmd} add pass ip6 from any to ${oip} 25 setup proto tcp
 244
 245         # Allow access to our DNS
 246         ${fw6cmd} add pass ip6 from any to ${oip} 53 setup proto tcp
 247         ${fw6cmd} add pass ip6 from any to ${oip} 53 proto udp
 248         ${fw6cmd} add pass ip6 from ${oip} 53 to any proto udp
 249
 250         # Allow access to our WWW
 251         ${fw6cmd} add pass ip6 from any to ${oip} 80 setup proto tcp
 252
 253         # Reject&Log all setup of incoming connections from the outside
 254         ${fw6cmd} add deny log ip6 from any to any in via ${oif} setup \
 255             proto tcp
 256
 257         # Allow setup of any other TCP connection
 258         ${fw6cmd} add pass ip6 from any to any setup proto tcp
 259
 260         # Allow DNS queries out in the world
 261         ${fw6cmd} add pass ip6 from any 53 to ${oip} proto udp
 262         ${fw6cmd} add pass ip6 from ${oip} to any 53 proto udp
 263
 264         # Allow NTP queries out in the world
 265         ${fw6cmd} add pass ip6 from any 123 to ${oip} proto udp
 266         ${fw6cmd} add pass ip6 from ${oip} to any 123 proto udp
 267
 268         # Allow RIPng
 269         #${fw6cmd} add pass ip6 from fe80::/10 521 to ff02::9 521 proto udp
 270         #${fw6cmd} add pass ip6 from fe80::/10 521 to fe80::/10 521 proto udp
 271
 272         # Allow ICMPv6 destination unreach
 273         ${fw6cmd} add pass ip6 from any to any icmp6types 1 proto ipv6-icmp
 274
 275         # Allow NS/NA/toobig (don't filter it out)
 276         ${fw6cmd} add pass ip6 from any to any icmp6types 2,135,136 \
 277              proto ipv6-icmp
 278
 279         # Everything else is denied by default, unless the
 280         # IPV6FIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
 281         # config file.
 282         ;;
 283
 284 [Cc][Ll][Oo][Ss][Ee][Dd])
 285         # Only enable the loopback interface
 286         ${fw6cmd} add 100 pass ip6 from any to any via lo0
 287         ;;
 288 [Uu][Nn][Kk][Nn][Oo][Ww][Nn])
 289         ;;
 290 *)
 291         if [ -r "${ipv6_firewall_type}" ]; then
 292                 ${fw6cmd} ${ipv6_firewall_flags} ${ipv6_firewall_type}
 293         fi
 294         ;;
 295 esac