etc/rc.firewall

   1 #!/bin/sh -
   2 # Copyright (c) 1996  Poul-Henning Kamp
   3 # All rights reserved.
   4 #
   5 # Redistribution and use in source and binary forms, with or without
   6 # modification, are permitted provided that the following conditions
   7 # are met:
   8 # 1. Redistributions of source code must retain the above copyright
   9 #    notice, this list of conditions and the following disclaimer.
  10 # 2. Redistributions in binary form must reproduce the above copyright
  11 #    notice, this list of conditions and the following disclaimer in the
  12 #    documentation and/or other materials provided with the distribution.
  13 #
  14 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17 # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24 # SUCH DAMAGE.
  25 #
  26 # $FreeBSD$
  27 #
  28
  29 #
  30 # Setup system for ipfw(4) firewall service.
  31 #
  32
  33 # Suck in the configuration variables.
  34 if [ -z "${source_rc_confs_defined}" ]; then
  35         if [ -r /etc/defaults/rc.conf ]; then
  36                 . /etc/defaults/rc.conf
  37                 source_rc_confs
  38         elif [ -r /etc/rc.conf ]; then
  39                 . /etc/rc.conf
  40         fi
  41 fi
  42
  43 ############
  44 # Define the firewall type in /etc/rc.conf.  Valid values are:
  45 #   open        - will allow anyone in
  46 #   client      - will try to protect just this machine
  47 #   simple      - will try to protect a whole network
  48 #   closed      - totally disables IP services except via lo0 interface
  49 #   workstation - will try to protect just this machine using stateful
  50 #                 firewalling. See below for rc.conf variables used
  51 #   UNKNOWN     - disables the loading of firewall rules.
  52 #   filename    - will load the rules in the given filename (full path required)
  53 #
  54 # For ``client'' and ``simple'' the entries below should be customized
  55 # appropriately.
  56
  57 ############
  58 #
  59 # If you don't know enough about packet filtering, we suggest that you
  60 # take time to read this book:
  61 #
  62 #       Building Internet Firewalls, 2nd Edition
  63 #       Brent Chapman and Elizabeth Zwicky
  64 #
  65 #       O'Reilly & Associates, Inc
  66 #       ISBN 1-56592-871-7
  67 #       http://www.ora.com/
  68 #       http://www.oreilly.com/catalog/fire2/
  69 #
  70 # For a more advanced treatment of Internet Security read:
  71 #
  72 #       Firewalls and Internet Security: Repelling the Wily Hacker, 2nd Edition
  73 #       William R. Cheswick, Steven M. Bellowin, Aviel D. Rubin
  74 #
  75 #       Addison-Wesley / Prentice Hall
  76 #       ISBN 0-201-63466-X
  77 #       http://www.pearsonhighered.com/
  78 #       http://www.pearsonhighered.com/educator/academic/product/0,3110,020163466X,00.html
  79 #
  80
  81 setup_loopback() {
  82         ############
  83         # Only in rare cases do you want to change these rules
  84         #
  85         ${fwcmd} add 100 pass all from any to any via lo0
  86         ${fwcmd} add 200 deny all from any to 127.0.0.0/8
  87         ${fwcmd} add 300 deny ip from 127.0.0.0/8 to any
  88         if [ $ipv6_available -eq 0 ]; then
  89                 ${fwcmd} add 400 deny all from any to ::1
  90                 ${fwcmd} add 500 deny all from ::1 to any
  91         fi
  92 }
  93
  94 setup_ipv6_mandatory() {
  95         [ $ipv6_available -eq 0 ] || return 0
  96
  97         ############
  98         # Only in rare cases do you want to change these rules
  99         #
 100         # ND
 101         #
 102         # DAD
 103         ${fwcmd} add pass ipv6-icmp from :: to ff02::/16
 104         # RS, RA, NS, NA, redirect...
 105         ${fwcmd} add pass ipv6-icmp from fe80::/10 to fe80::/10
 106         ${fwcmd} add pass ipv6-icmp from fe80::/10 to ff02::/16
 107
 108         # Allow ICMPv6 destination unreachable
 109         ${fwcmd} add pass ipv6-icmp from any to any icmp6types 1
 110
 111         # Allow NS/NA/toobig (don't filter it out)
 112         ${fwcmd} add pass ipv6-icmp from any to any icmp6types 2,135,136
 113 }
 114
 115 if [ -n "${1}" ]; then
 116         firewall_type="${1}"
 117 fi
 118
 119 . /etc/rc.subr
 120 . /etc/network.subr
 121 afexists inet6
 122 ipv6_available=$?
 123
 124 ############
 125 # Set quiet mode if requested
 126 #
 127 case ${firewall_quiet} in
 128 [Yy][Ee][Ss])
 129         fwcmd="/sbin/ipfw -q"
 130         ;;
 131 *)
 132         fwcmd="/sbin/ipfw"
 133         ;;
 134 esac
 135
 136 ############
 137 # Flush out the list before we begin.
 138 #
 139 ${fwcmd} -f flush
 140
 141 setup_loopback
 142 setup_ipv6_mandatory
 143
 144 ############
 145 # Network Address Translation.  All packets are passed to natd(8)
 146 # before they encounter your remaining rules.  The firewall rules
 147 # will then be run again on each packet after translation by natd
 148 # starting at the rule number following the divert rule.
 149 #
 150 # For ``simple'' firewall type the divert rule should be put to a
 151 # different place to not interfere with address-checking rules.
 152 #
 153 case ${firewall_type} in
 154 [Oo][Pp][Ee][Nn]|[Cc][Ll][Ii][Ee][Nn][Tt])
 155         case ${natd_enable} in
 156         [Yy][Ee][Ss])
 157                 if [ -n "${natd_interface}" ]; then
 158                         ${fwcmd} add 50 divert natd ip4 from any to any via ${natd_interface}
 159                 fi
 160                 ;;
 161         esac
 162         case ${firewall_nat_enable} in
 163         [Yy][Ee][Ss])
 164                 if [ -n "${firewall_nat_interface}" ]; then
 165                         if echo "${firewall_nat_interface}" | \
 166                                 grep -q -E '^[0-9]+(\.[0-9]+){0,3}$'; then
 167                                 firewall_nat_flags="ip ${firewall_nat_interface} ${firewall_nat_flags}"
 168                         else
 169                                 firewall_nat_flags="if ${firewall_nat_interface} ${firewall_nat_flags}"
 170                         fi
 171                         ${fwcmd} nat 123 config log ${firewall_nat_flags}
 172                         ${fwcmd} add 50 nat 123 ip4 from any to any via ${firewall_nat_interface}
 173                 fi
 174                 ;;
 175         esac
 176 esac
 177
 178 ############
 179 # If you just configured ipfw in the kernel as a tool to solve network
 180 # problems or you just want to disallow some particular kinds of traffic
 181 # then you will want to change the default policy to open.  You can also
 182 # do this as your only action by setting the firewall_type to ``open''.
 183 #
 184 # ${fwcmd} add 65000 pass all from any to any
 185
 186
 187 # Prototype setups.
 188 #
 189 case ${firewall_type} in
 190 [Oo][Pp][Ee][Nn])
 191         ${fwcmd} add 65000 pass all from any to any
 192         ;;
 193
 194 [Cc][Ll][Ii][Ee][Nn][Tt])
 195         ############
 196         # This is a prototype setup that will protect your system somewhat
 197         # against people from outside your own network.
 198         #
 199         # Configuration:
 200         #  firewall_client_net:         Network address of local IPv4 network.
 201         #  firewall_client_net_ipv6:    Network address of local IPv6 network.
 202         ############
 203
 204         # set this to your local network
 205         net="$firewall_client_net"
 206         net6="$firewall_client_net_ipv6"
 207
 208         # Allow limited broadcast traffic from my own net.
 209         ${fwcmd} add pass all from ${net} to 255.255.255.255
 210
 211         # Allow any traffic to or from my own net.
 212         ${fwcmd} add pass all from me to ${net}
 213         ${fwcmd} add pass all from ${net} to me
 214         if [ -n "$net6" ]; then
 215                 ${fwcmd} add pass all from me to ${net6}
 216                 ${fwcmd} add pass all from ${net6} to me
 217         fi
 218
 219         if [ -n "$net6" ]; then
 220                 # Allow any link-local multicast traffic
 221                 ${fwcmd} add pass all from fe80::/10 to ff02::/16
 222                 ${fwcmd} add pass all from ${net6} to ff02::/16
 223                 # Allow DHCPv6
 224                 ${fwcmd} add pass udp from fe80::/10 to me 546
 225         fi
 226
 227         # Allow TCP through if setup succeeded
 228         ${fwcmd} add pass tcp from any to any established
 229
 230         # Allow IP fragments to pass through
 231         ${fwcmd} add pass all from any to any frag
 232
 233         # Allow setup of incoming email
 234         ${fwcmd} add pass tcp from any to me 25 setup
 235
 236         # Allow setup of outgoing TCP connections only
 237         ${fwcmd} add pass tcp from me to any setup
 238
 239         # Disallow setup of all other TCP connections
 240         ${fwcmd} add deny tcp from any to any setup
 241
 242         # Allow DNS queries out in the world
 243         ${fwcmd} add pass udp from me to any 53 keep-state
 244
 245         # Allow NTP queries out in the world
 246         ${fwcmd} add pass udp from me to any 123 keep-state
 247
 248         # Everything else is denied by default, unless the
 249         # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
 250         # config file.
 251         ;;
 252
 253 [Ss][Ii][Mm][Pp][Ll][Ee])
 254         ############
 255         # This is a prototype setup for a simple firewall.  Configure this
 256         # machine as a DNS and NTP server, and point all the machines
 257         # on the inside at this machine for those services.
 258         #
 259         # Configuration:
 260         #  firewall_simple_iif:         Inside IPv4 network interface.
 261         #  firewall_simple_inet:        Inside IPv4 network address.
 262         #  firewall_simple_oif:         Outside IPv4 network interface.
 263         #  firewall_simple_onet:        Outside IPv4 network address.
 264         #  firewall_simple_iif_ipv6:    Inside IPv6 network interface.
 265         #  firewall_simple_inet_ipv6:   Inside IPv6 network prefix.
 266         #  firewall_simple_oif_ipv6:    Outside IPv6 network interface.
 267         #  firewall_simple_onet_ipv6:   Outside IPv6 network prefix.
 268         ############
 269         BAD_ADDR_TBL=13
 270
 271         # set these to your outside interface network
 272         oif="$firewall_simple_oif"
 273         onet="$firewall_simple_onet"
 274         oif6="${firewall_simple_oif_ipv6:-$firewall_simple_oif}"
 275         onet6="$firewall_simple_onet_ipv6"
 276
 277         # set these to your inside interface network
 278         iif="$firewall_simple_iif"
 279         inet="$firewall_simple_inet"
 280         iif6="${firewall_simple_iif_ipv6:-$firewall_simple_iif}"
 281         inet6="$firewall_simple_inet_ipv6"
 282
 283         # Stop spoofing
 284         ${fwcmd} add deny all from ${inet} to any in via ${oif}
 285         ${fwcmd} add deny all from ${onet} to any in via ${iif}
 286         if [ -n "$inet6" ]; then
 287                 ${fwcmd} add deny all from ${inet6} to any in via ${oif6}
 288                 if [ -n "$onet6" ]; then
 289                         ${fwcmd} add deny all from ${onet6} to any in \
 290                             via ${iif6}
 291                 fi
 292         fi
 293
 294         # Define stuff we should never send out or receive in.
 295         # Stop RFC1918 nets on the outside interface
 296         ${fwcmd} table ${BAD_ADDR_TBL} flush
 297         ${fwcmd} table ${BAD_ADDR_TBL} add 10.0.0.0/8
 298         ${fwcmd} table ${BAD_ADDR_TBL} add 172.16.0.0/12
 299         ${fwcmd} table ${BAD_ADDR_TBL} add 192.168.0.0/16
 300
 301         # And stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
 302         # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
 303         # on the outside interface
 304         ${fwcmd} table ${BAD_ADDR_TBL} add 0.0.0.0/8
 305         ${fwcmd} table ${BAD_ADDR_TBL} add 169.254.0.0/16
 306         ${fwcmd} table ${BAD_ADDR_TBL} add 192.0.2.0/24
 307         ${fwcmd} table ${BAD_ADDR_TBL} add 224.0.0.0/4
 308         ${fwcmd} table ${BAD_ADDR_TBL} add 240.0.0.0/4
 309
 310         ${fwcmd} add deny all from any to "table($BAD_ADDR_TBL)" via ${oif}
 311
 312         # Network Address Translation.  This rule is placed here deliberately
 313         # so that it does not interfere with the surrounding address-checking
 314         # rules.  If for example one of your internal LAN machines had its IP
 315         # address set to 192.0.2.1 then an incoming packet for it after being
 316         # translated by natd(8) would match the `deny' rule above.  Similarly
 317         # an outgoing packet originated from it before being translated would
 318         # match the `deny' rule below.
 319         case ${natd_enable} in
 320         [Yy][Ee][Ss])
 321                 if [ -n "${natd_interface}" ]; then
 322                         ${fwcmd} add divert natd ip4 from any to any via ${natd_interface}
 323                 fi
 324                 ;;
 325         esac
 326
 327         ${fwcmd} add deny all from "table($BAD_ADDR_TBL)" to any via ${oif}
 328         if [ -n "$inet6" ]; then
 329                 # Stop unique local unicast address on the outside interface
 330                 ${fwcmd} add deny all from fc00::/7 to any via ${oif6}
 331                 ${fwcmd} add deny all from any to fc00::/7 via ${oif6}
 332
 333                 # Stop site-local on the outside interface
 334                 ${fwcmd} add deny all from fec0::/10 to any via ${oif6}
 335                 ${fwcmd} add deny all from any to fec0::/10 via ${oif6}
 336
 337                 # Disallow "internal" addresses to appear on the wire.
 338                 ${fwcmd} add deny all from ::ffff:0.0.0.0/96 to any \
 339                     via ${oif6}
 340                 ${fwcmd} add deny all from any to ::ffff:0.0.0.0/96 \
 341                     via ${oif6}
 342
 343                 # Disallow packets to malicious IPv4 compatible prefix.
 344                 ${fwcmd} add deny all from ::224.0.0.0/100 to any via ${oif6}
 345                 ${fwcmd} add deny all from any to ::224.0.0.0/100 via ${oif6}
 346                 ${fwcmd} add deny all from ::127.0.0.0/104 to any via ${oif6}
 347                 ${fwcmd} add deny all from any to ::127.0.0.0/104 via ${oif6}
 348                 ${fwcmd} add deny all from ::0.0.0.0/104 to any via ${oif6}
 349                 ${fwcmd} add deny all from any to ::0.0.0.0/104 via ${oif6}
 350                 ${fwcmd} add deny all from ::255.0.0.0/104 to any via ${oif6}
 351                 ${fwcmd} add deny all from any to ::255.0.0.0/104 via ${oif6}
 352
 353                 ${fwcmd} add deny all from ::0.0.0.0/96 to any via ${oif6}
 354                 ${fwcmd} add deny all from any to ::0.0.0.0/96 via ${oif6}
 355
 356                 # Disallow packets to malicious 6to4 prefix.
 357                 ${fwcmd} add deny all from 2002:e000::/20 to any via ${oif6}
 358                 ${fwcmd} add deny all from any to 2002:e000::/20 via ${oif6}
 359                 ${fwcmd} add deny all from 2002:7f00::/24 to any via ${oif6}
 360                 ${fwcmd} add deny all from any to 2002:7f00::/24 via ${oif6}
 361                 ${fwcmd} add deny all from 2002:0000::/24 to any via ${oif6}
 362                 ${fwcmd} add deny all from any to 2002:0000::/24 via ${oif6}
 363                 ${fwcmd} add deny all from 2002:ff00::/24 to any via ${oif6}
 364                 ${fwcmd} add deny all from any to 2002:ff00::/24 via ${oif6}
 365
 366                 ${fwcmd} add deny all from 2002:0a00::/24 to any via ${oif6}
 367                 ${fwcmd} add deny all from any to 2002:0a00::/24 via ${oif6}
 368                 ${fwcmd} add deny all from 2002:ac10::/28 to any via ${oif6}
 369                 ${fwcmd} add deny all from any to 2002:ac10::/28 via ${oif6}
 370                 ${fwcmd} add deny all from 2002:c0a8::/32 to any via ${oif6}
 371                 ${fwcmd} add deny all from any to 2002:c0a8::/32 via ${oif6}
 372
 373                 ${fwcmd} add deny all from ff05::/16 to any via ${oif6}
 374                 ${fwcmd} add deny all from any to ff05::/16 via ${oif6}
 375         fi
 376
 377         # Allow TCP through if setup succeeded
 378         ${fwcmd} add pass tcp from any to any established
 379
 380         # Allow IP fragments to pass through
 381         ${fwcmd} add pass all from any to any frag
 382
 383         # Allow setup of incoming email
 384         ${fwcmd} add pass tcp from any to me 25 setup
 385
 386         # Allow access to our DNS
 387         ${fwcmd} add pass tcp from any to me 53 setup
 388         ${fwcmd} add pass udp from any to me 53
 389         ${fwcmd} add pass udp from me 53 to any
 390
 391         # Allow access to our WWW
 392         ${fwcmd} add pass tcp from any to me 80 setup
 393
 394         # Reject&Log all setup of incoming connections from the outside
 395         ${fwcmd} add deny log ip4 from any to any in via ${oif} setup proto tcp
 396         if [ -n "$inet6" ]; then
 397                 ${fwcmd} add deny log ip6 from any to any in via ${oif6} \
 398                     setup proto tcp
 399         fi
 400
 401         # Allow setup of any other TCP connection
 402         ${fwcmd} add pass tcp from any to any setup
 403
 404         # Allow DNS queries out in the world
 405         ${fwcmd} add pass udp from me to any 53 keep-state
 406
 407         # Allow NTP queries out in the world
 408         ${fwcmd} add pass udp from me to any 123 keep-state
 409
 410         # Everything else is denied by default, unless the
 411         # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
 412         # config file.
 413         ;;
 414
 415 [Ww][Oo][Rr][Kk][Ss][Tt][Aa][Tt][Ii][Oo][Nn])
 416         # Configuration:
 417         #  firewall_myservices:         List of ports/protocols on which this
 418         #                                host offers services.
 419         #  firewall_allowservices:      List of IPv4 and/or IPv6 addresses
 420         #                                that have access to
 421         #                                $firewall_myservices.
 422         #  firewall_trusted:            List of IPv4 and/or IPv6 addresses
 423         #                                that have full access to this host.
 424         #                                Be very careful when setting this.
 425         #                                This option can seriously degrade
 426         #                                the level of protection provided by
 427         #                                the firewall.
 428         #  firewall_logdeny:            Boolean (YES/NO) specifying if the
 429         #                                default denied packets should be
 430         #                                logged (in /var/log/security).
 431         #  firewall_nologports:         List of TCP/UDP ports for which
 432         #                                denied incoming packets are not
 433         #                                logged.
 434
 435         # Allow packets for which a state has been built.
 436         ${fwcmd} add check-state
 437
 438         # For services permitted below.
 439         ${fwcmd} add pass tcp  from me to any established
 440
 441         # Allow any connection out, adding state for each.
 442         ${fwcmd} add pass tcp  from me to any setup keep-state
 443         ${fwcmd} add pass udp  from me to any       keep-state
 444         ${fwcmd} add pass icmp from me to any       keep-state
 445         if [ $ipv6_available -eq 0 ]; then
 446                 ${fwcmd} add pass ipv6-icmp from me to any keep-state
 447         fi
 448
 449         # Allow DHCP.
 450         ${fwcmd} add pass udp  from 0.0.0.0 68 to 255.255.255.255 67 out
 451         ${fwcmd} add pass udp  from any 67     to me 68 in
 452         ${fwcmd} add pass udp  from any 67     to 255.255.255.255 68 in
 453         if [ $ipv6_available -eq 0 ]; then
 454                 ${fwcmd} add pass udp from fe80::/10 to me 546 in
 455         fi
 456         # Some servers will ping the IP while trying to decide if it's
 457         # still in use.
 458         ${fwcmd} add pass icmp from any to any icmptype 8
 459         if [ $ipv6_available -eq 0 ]; then
 460                 ${fwcmd} add pass ipv6-icmp from any to any icmp6type 128,129
 461         fi
 462
 463         # Allow "mandatory" ICMP in.
 464         ${fwcmd} add pass icmp from any to any icmptype 3,4,11
 465         if [ $ipv6_available -eq 0 ]; then
 466                 ${fwcmd} add pass ipv6-icmp from any to any icmp6type 3
 467         fi
 468
 469         # Add permits for this workstations published services below
 470         # Only IPs and nets in firewall_allowservices is allowed in.
 471         # If you really wish to let anyone use services on your
 472         # workstation, then set "firewall_allowservices='any'" in /etc/rc.conf
 473         #
 474         # Note: We don't use keep-state as that would allow DoS of
 475         #       our statetable.
 476         #       You can add 'keep-state' to the lines for slightly
 477         #       better performance if you fell that DoS of your
 478         #       workstation won't be a problem.
 479         #
 480         for i in ${firewall_allowservices} ; do
 481           for j in ${firewall_myservices} ; do
 482             case $j in
 483             [0-9A-Za-z]*/[Pp][Rr][Oo][Tt][Oo])
 484               ${fwcmd} add pass ${j%/[Pp][Rr][Oo][Tt][Oo]} from $i to me
 485             ;;
 486             [0-9A-Za-z]*/[Tt][Cc][Pp])
 487               ${fwcmd} add pass tcp from $i to me ${j%/[Tt][Cc][Pp]}
 488             ;;
 489             [0-9A-Za-z]*/[Uu][Dd][Pp])
 490               ${fwcmd} add pass udp from $i to me ${j%/[Uu][Dd][Pp]}
 491             ;;
 492             *[0-9A-Za-z])
 493               echo "Consider using ${j}/tcp in firewall_myservices." \
 494                 > /dev/stderr
 495               ${fwcmd} add pass tcp from $i to me $j
 496             ;;
 497             *)
 498               echo "Invalid port in firewall_myservices: $j" > /dev/stderr
 499             ;;
 500             esac
 501           done
 502         done
 503
 504         # Allow all connections from trusted IPs.
 505         # Playing with the content of firewall_trusted could seriously
 506         # degrade the level of protection provided by the firewall.
 507         for i in ${firewall_trusted} ; do
 508           ${fwcmd} add pass ip from $i to me
 509         done
 510
 511         ${fwcmd} add 65000 count ip from any to any
 512
 513         # Drop packets to ports where we don't want logging
 514         for i in ${firewall_nologports} ; do
 515           ${fwcmd} add deny { tcp or udp } from any to any $i in
 516         done
 517
 518         # Broadcasts and multicasts
 519         ${fwcmd} add deny ip  from any to 255.255.255.255
 520         ${fwcmd} add deny ip  from any to 224.0.0.0/24 in       # XXX
 521
 522         # Noise from routers
 523         ${fwcmd} add deny udp from any to any 520 in
 524
 525         # Noise from webbrowsing.
 526         # The stateful filter is a bit aggressive, and will cause some
 527         #  connection teardowns to be logged.
 528         ${fwcmd} add deny tcp from any 80,443 to any 1024-65535 in
 529
 530         # Deny and (if wanted) log the rest unconditionally.
 531         log=""
 532         if [ ${firewall_logdeny:-x} = "YES" -o ${firewall_logdeny:-x} = "yes" ] ; then
 533           log="log logamount 500"       # The default of 100 is too low.
 534           sysctl net.inet.ip.fw.verbose=1 >/dev/null
 535         fi
 536         ${fwcmd} add deny $log ip from any to any
 537         ;;
 538
 539 [Cc][Ll][Oo][Ss][Ee][Dd])
 540         ${fwcmd} add 65000 deny ip from any to any
 541         ;;
 542 [Uu][Nn][Kk][Nn][Oo][Ww][Nn])
 543         ;;
 544 *)
 545         if [ -r "${firewall_type}" ]; then
 546                 ${fwcmd} ${firewall_flags} ${firewall_type}
 547         fi
 548         ;;
 549 esac