libexec/rc/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 #
  27
  28 #
  29 # Setup system for ipfw(4) firewall service.
  30 #
  31
  32 # Suck in the configuration variables.
  33 if [ -z "${source_rc_confs_defined}" ]; then
  34         if [ -r /etc/defaults/rc.conf ]; then
  35                 . /etc/defaults/rc.conf
  36                 source_rc_confs
  37         elif [ -r /etc/rc.conf ]; then
  38                 . /etc/rc.conf
  39         fi
  40 fi
  41
  42 ############
  43 # Define the firewall type in /etc/rc.conf.  Valid values are:
  44 #   open        - will allow anyone in
  45 #   client      - will try to protect just this machine
  46 #   simple      - will try to protect a whole network
  47 #   closed      - totally disables IP services except via lo0 interface
  48 #   workstation - will try to protect just this machine using stateful
  49 #                 firewalling. See below for rc.conf variables used
  50 #   UNKNOWN     - disables the loading of firewall rules.
  51 #   filename    - will load the rules in the given filename (full path required)
  52 #
  53 # For ``client'' and ``simple'' the entries below should be customized
  54 # appropriately.
  55
  56 ############
  57 #
  58 # If you don't know enough about packet filtering, we suggest that you
  59 # take time to read this book:
  60 #
  61 #       Building Internet Firewalls, 2nd Edition
  62 #       Brent Chapman and Elizabeth Zwicky
  63 #
  64 #       O'Reilly & Associates, Inc
  65 #       ISBN 1-56592-871-7
  66 #       http://www.ora.com/
  67 #       http://www.oreilly.com/catalog/fire2/
  68 #
  69 # For a more advanced treatment of Internet Security read:
  70 #
  71 #       Firewalls and Internet Security: Repelling the Wily Hacker, 2nd Edition
  72 #       William R. Cheswick, Steven M. Bellowin, Aviel D. Rubin
  73 #
  74 #       Addison-Wesley / Prentice Hall
  75 #       ISBN 0-201-63466-X
  76 #       http://www.pearsonhighered.com/
  77 #       http://www.pearsonhighered.com/educator/academic/product/0,3110,020163466X,00.html
  78 #
  79
  80 setup_loopback() {
  81         ############
  82         # Only in rare cases do you want to change these rules
  83         #
  84         ${fwcmd} add 100 pass all from any to any via lo0
  85         ${fwcmd} add 200 deny all from any to 127.0.0.0/8
  86         ${fwcmd} add 300 deny ip from 127.0.0.0/8 to any
  87         if [ $ipv6_available -eq 0 ]; then
  88                 ${fwcmd} add 400 deny all from any to ::1
  89                 ${fwcmd} add 500 deny all from ::1 to any
  90         fi
  91 }
  92
  93 setup_ipv6_mandatory() {
  94         [ $ipv6_available -eq 0 ] || return 0
  95
  96         ############
  97         # Only in rare cases do you want to change these rules
  98         #
  99         # ND
 100         #
 101         # DAD
 102         ${fwcmd} add pass ipv6-icmp from :: to ff02::/16
 103         # RS, RA, NS, NA, redirect...
 104         ${fwcmd} add pass ipv6-icmp from fe80::/10 to fe80::/10
 105         ${fwcmd} add pass ipv6-icmp from fe80::/10 to ff02::/16
 106
 107         # Allow ICMPv6 destination unreachable
 108         ${fwcmd} add pass ipv6-icmp from any to any icmp6types 1
 109
 110         # Allow NS/NA/toobig (don't filter it out)
 111         ${fwcmd} add pass ipv6-icmp from any to any icmp6types 2,135,136
 112 }
 113
 114 . /etc/rc.subr
 115 . /etc/network.subr
 116
 117 if [ -n "${1}" ]; then
 118         firewall_type="${1}"
 119 fi
 120 if [ -z "${firewall_rc_config_load}" ]; then
 121         load_rc_config ipfw
 122 else
 123         for i in ${firewall_rc_config_load}; do
 124                 load_rc_config $i
 125         done
 126 fi
 127
 128 afexists inet6
 129 ipv6_available=$?
 130
 131 ############
 132 # Set quiet mode if requested
 133 #
 134 case ${firewall_quiet} in
 135 [Yy][Ee][Ss])
 136         fwcmd="/sbin/ipfw -q"
 137         ;;
 138 *)
 139         fwcmd="/sbin/ipfw"
 140         ;;
 141 esac
 142
 143 ############
 144 # Flush out the list before we begin.
 145 #
 146 ${fwcmd} -f flush
 147
 148 setup_loopback
 149 setup_ipv6_mandatory
 150
 151 ############
 152 # Network Address Translation.  All packets are passed to natd(8)
 153 # before they encounter your remaining rules.  The firewall rules
 154 # will then be run again on each packet after translation by natd
 155 # starting at the rule number following the divert rule.
 156 #
 157 # For ``simple'' firewall type the divert rule should be put to a
 158 # different place to not interfere with address-checking rules.
 159 #
 160 case ${firewall_type} in
 161 [Oo][Pp][Ee][Nn]|[Cc][Ll][Ii][Ee][Nn][Tt])
 162         case ${natd_enable} in
 163         [Yy][Ee][Ss])
 164                 if [ -n "${natd_interface}" ]; then
 165                         ${fwcmd} add 50 divert natd ip4 from any to any via ${natd_interface}
 166                 fi
 167                 ;;
 168         esac
 169         case ${firewall_nat_enable} in
 170         [Yy][Ee][Ss])
 171                 if [ -n "${firewall_nat_interface}" ]; then
 172                         if echo "${firewall_nat_interface}" | \
 173                                 grep -q -E '^[0-9]+(\.[0-9]+){0,3}$'; then
 174                                 firewall_nat_flags="ip ${firewall_nat_interface} ${firewall_nat_flags}"
 175                         else
 176                                 firewall_nat_flags="if ${firewall_nat_interface} ${firewall_nat_flags}"
 177                         fi
 178                         ${fwcmd} nat 123 config log ${firewall_nat_flags}
 179                         ${fwcmd} add 50 nat 123 ip4 from any to any via ${firewall_nat_interface}
 180                 fi
 181                 ;;
 182         esac
 183 esac
 184
 185 ############
 186 # If you just configured ipfw in the kernel as a tool to solve network
 187 # problems or you just want to disallow some particular kinds of traffic
 188 # then you will want to change the default policy to open.  You can also
 189 # do this as your only action by setting the firewall_type to ``open''.
 190 #
 191 # ${fwcmd} add 65000 pass all from any to any
 192
 193
 194 # Prototype setups.
 195 #
 196 case ${firewall_type} in
 197 [Oo][Pp][Ee][Nn])
 198         ${fwcmd} add 65000 pass all from any to any
 199         ;;
 200
 201 [Cc][Ll][Ii][Ee][Nn][Tt])
 202         ############
 203         # This is a prototype setup that will protect your system somewhat
 204         # against people from outside your own network.
 205         #
 206         # Configuration:
 207         #  firewall_client_net:         Network address of local IPv4 network.
 208         #  firewall_client_net_ipv6:    Network address of local IPv6 network.
 209         ############
 210
 211         # set this to your local network
 212         net="$firewall_client_net"
 213         net6="$firewall_client_net_ipv6"
 214
 215         # Allow limited broadcast traffic from my own net.
 216         ${fwcmd} add pass all from ${net} to 255.255.255.255
 217
 218         # Allow any traffic to or from my own net.
 219         ${fwcmd} add pass all from me to ${net}
 220         ${fwcmd} add pass all from ${net} to me
 221         if [ -n "$net6" ]; then
 222                 ${fwcmd} add pass all from me to ${net6}
 223                 ${fwcmd} add pass all from ${net6} to me
 224                 # Allow any link-local multicast traffic
 225                 ${fwcmd} add pass all from fe80::/10 to ff02::/16
 226                 ${fwcmd} add pass all from ${net6} to ff02::/16
 227                 # Allow DHCPv6
 228                 ${fwcmd} add pass udp from fe80::/10 to me 546
 229         fi
 230
 231         # Allow TCP through if setup succeeded
 232         ${fwcmd} add pass tcp from any to any established
 233
 234         # Allow IP fragments to pass through
 235         ${fwcmd} add pass all from any to any frag
 236
 237         # Allow setup of incoming email
 238         ${fwcmd} add pass tcp from any to me 25 setup
 239
 240         # Allow setup of outgoing TCP connections only
 241         ${fwcmd} add pass tcp from me to any setup
 242
 243         # Disallow setup of all other TCP connections
 244         ${fwcmd} add deny tcp from any to any setup
 245
 246         # Allow DNS queries out in the world
 247         ${fwcmd} add pass udp from me to any 53 keep-state
 248
 249         # Allow NTP queries out in the world
 250         ${fwcmd} add pass udp from me to any 123 keep-state
 251
 252         # Everything else is denied by default, unless the
 253         # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
 254         # config file.
 255         ;;
 256
 257 [Ss][Ii][Mm][Pp][Ll][Ee])
 258         ############
 259         # This is a prototype setup for a simple firewall.  Configure this
 260         # machine as a DNS and NTP server, and point all the machines
 261         # on the inside at this machine for those services.
 262         #
 263         # Configuration:
 264         #  firewall_simple_iif:         Inside IPv4 network interface.
 265         #  firewall_simple_inet:        Inside IPv4 network address.
 266         #  firewall_simple_oif:         Outside IPv4 network interface.
 267         #  firewall_simple_onet:        Outside IPv4 network address.
 268         #  firewall_simple_iif_ipv6:    Inside IPv6 network interface.
 269         #  firewall_simple_inet_ipv6:   Inside IPv6 network prefix.
 270         #  firewall_simple_oif_ipv6:    Outside IPv6 network interface.
 271         #  firewall_simple_onet_ipv6:   Outside IPv6 network prefix.
 272         ############
 273         BAD_ADDR_TBL=13
 274
 275         # set these to your outside interface network
 276         oif="$firewall_simple_oif"
 277         onet="$firewall_simple_onet"
 278         oif6="${firewall_simple_oif_ipv6:-$firewall_simple_oif}"
 279         onet6="$firewall_simple_onet_ipv6"
 280
 281         # set these to your inside interface network
 282         iif="$firewall_simple_iif"
 283         inet="$firewall_simple_inet"
 284         iif6="${firewall_simple_iif_ipv6:-$firewall_simple_iif}"
 285         inet6="$firewall_simple_inet_ipv6"
 286
 287         # Stop spoofing
 288         ${fwcmd} add deny all from ${inet} to any in via ${oif}
 289         ${fwcmd} add deny all from ${onet} to any in via ${iif}
 290         if [ -n "$inet6" ]; then
 291                 ${fwcmd} add deny all from ${inet6} to any in via ${oif6}
 292                 if [ -n "$onet6" ]; then
 293                         ${fwcmd} add deny all from ${onet6} to any in \
 294                             via ${iif6}
 295                 fi
 296         fi
 297
 298         # Define stuff we should never send out or receive in.
 299         # Stop RFC1918 nets on the outside interface
 300         ${fwcmd} table ${BAD_ADDR_TBL} flush
 301         ${fwcmd} table ${BAD_ADDR_TBL} add 10.0.0.0/8
 302         ${fwcmd} table ${BAD_ADDR_TBL} add 172.16.0.0/12
 303         ${fwcmd} table ${BAD_ADDR_TBL} add 192.168.0.0/16
 304
 305         # And stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
 306         # DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E)
 307         # on the outside interface
 308         ${fwcmd} table ${BAD_ADDR_TBL} add 0.0.0.0/8
 309         ${fwcmd} table ${BAD_ADDR_TBL} add 169.254.0.0/16
 310         ${fwcmd} table ${BAD_ADDR_TBL} add 192.0.2.0/24
 311         ${fwcmd} table ${BAD_ADDR_TBL} add 224.0.0.0/4
 312         ${fwcmd} table ${BAD_ADDR_TBL} add 240.0.0.0/4
 313
 314         ${fwcmd} add deny all from any to "table($BAD_ADDR_TBL)" via ${oif}
 315
 316         # Network Address Translation.  This rule is placed here deliberately
 317         # so that it does not interfere with the surrounding address-checking
 318         # rules.  If for example one of your internal LAN machines had its IP
 319         # address set to 192.0.2.1 then an incoming packet for it after being
 320         # translated by natd(8) would match the `deny' rule above.  Similarly
 321         # an outgoing packet originated from it before being translated would
 322         # match the `deny' rule below.
 323         case ${natd_enable} in
 324         [Yy][Ee][Ss])
 325                 if [ -n "${natd_interface}" ]; then
 326                         ${fwcmd} add divert natd ip4 from any to any via ${natd_interface}
 327                 fi
 328                 ;;
 329         esac
 330
 331         ${fwcmd} add deny all from "table($BAD_ADDR_TBL)" to any via ${oif}
 332         if [ -n "$inet6" ]; then
 333                 # Stop unique local unicast address on the outside interface
 334                 ${fwcmd} add deny all from fc00::/7 to any via ${oif6}
 335                 ${fwcmd} add deny all from any to fc00::/7 via ${oif6}
 336
 337                 # Stop site-local on the outside interface
 338                 ${fwcmd} add deny all from fec0::/10 to any via ${oif6}
 339                 ${fwcmd} add deny all from any to fec0::/10 via ${oif6}
 340
 341                 # Disallow "internal" addresses to appear on the wire.
 342                 ${fwcmd} add deny all from ::ffff:0.0.0.0/96 to any \
 343                     via ${oif6}
 344                 ${fwcmd} add deny all from any to ::ffff:0.0.0.0/96 \
 345                     via ${oif6}
 346
 347                 # Disallow packets to malicious IPv4 compatible prefix.
 348                 ${fwcmd} add deny all from ::224.0.0.0/100 to any via ${oif6}
 349                 ${fwcmd} add deny all from any to ::224.0.0.0/100 via ${oif6}
 350                 ${fwcmd} add deny all from ::127.0.0.0/104 to any via ${oif6}
 351                 ${fwcmd} add deny all from any to ::127.0.0.0/104 via ${oif6}
 352                 ${fwcmd} add deny all from ::0.0.0.0/104 to any via ${oif6}
 353                 ${fwcmd} add deny all from any to ::0.0.0.0/104 via ${oif6}
 354                 ${fwcmd} add deny all from ::255.0.0.0/104 to any via ${oif6}
 355                 ${fwcmd} add deny all from any to ::255.0.0.0/104 via ${oif6}
 356
 357                 ${fwcmd} add deny all from ::0.0.0.0/96 to any via ${oif6}
 358                 ${fwcmd} add deny all from any to ::0.0.0.0/96 via ${oif6}
 359
 360                 # Disallow packets to malicious 6to4 prefix.
 361                 ${fwcmd} add deny all from 2002:e000::/20 to any via ${oif6}
 362                 ${fwcmd} add deny all from any to 2002:e000::/20 via ${oif6}
 363                 ${fwcmd} add deny all from 2002:7f00::/24 to any via ${oif6}
 364                 ${fwcmd} add deny all from any to 2002:7f00::/24 via ${oif6}
 365                 ${fwcmd} add deny all from 2002:0000::/24 to any via ${oif6}
 366                 ${fwcmd} add deny all from any to 2002:0000::/24 via ${oif6}
 367                 ${fwcmd} add deny all from 2002:ff00::/24 to any via ${oif6}
 368                 ${fwcmd} add deny all from any to 2002:ff00::/24 via ${oif6}
 369
 370                 ${fwcmd} add deny all from 2002:0a00::/24 to any via ${oif6}
 371                 ${fwcmd} add deny all from any to 2002:0a00::/24 via ${oif6}
 372                 ${fwcmd} add deny all from 2002:ac10::/28 to any via ${oif6}
 373                 ${fwcmd} add deny all from any to 2002:ac10::/28 via ${oif6}
 374                 ${fwcmd} add deny all from 2002:c0a8::/32 to any via ${oif6}
 375                 ${fwcmd} add deny all from any to 2002:c0a8::/32 via ${oif6}
 376
 377                 ${fwcmd} add deny all from ff05::/16 to any via ${oif6}
 378                 ${fwcmd} add deny all from any to ff05::/16 via ${oif6}
 379         fi
 380
 381         # Allow TCP through if setup succeeded
 382         ${fwcmd} add pass tcp from any to any established
 383
 384         # Allow IP fragments to pass through
 385         ${fwcmd} add pass all from any to any frag
 386
 387         # Allow setup of incoming email
 388         ${fwcmd} add pass tcp from any to me 25 setup
 389
 390         # Allow access to our DNS
 391         ${fwcmd} add pass tcp from any to me 53 setup
 392         ${fwcmd} add pass udp from any to me 53
 393         ${fwcmd} add pass udp from me 53 to any
 394
 395         # Allow access to our WWW
 396         ${fwcmd} add pass tcp from any to me 80 setup
 397
 398         # Reject&Log all setup of incoming connections from the outside
 399         ${fwcmd} add deny log ip4 from any to any in via ${oif} setup proto tcp
 400         if [ -n "$inet6" ]; then
 401                 ${fwcmd} add deny log ip6 from any to any in via ${oif6} \
 402                     setup proto tcp
 403         fi
 404
 405         # Allow setup of any other TCP connection
 406         ${fwcmd} add pass tcp from any to any setup
 407
 408         # Allow DNS queries out in the world
 409         ${fwcmd} add pass udp from me to any 53 keep-state
 410
 411         # Allow NTP queries out in the world
 412         ${fwcmd} add pass udp from me to any 123 keep-state
 413
 414         # Everything else is denied by default, unless the
 415         # IPFIREWALL_DEFAULT_TO_ACCEPT option is set in your kernel
 416         # config file.
 417         ;;
 418
 419 [Ww][Oo][Rr][Kk][Ss][Tt][Aa][Tt][Ii][Oo][Nn])
 420         # Configuration:
 421         #  firewall_myservices:         List of ports/protocols on which this
 422         #                                host offers services.
 423         #  firewall_allowservices:      List of IPv4 and/or IPv6 addresses
 424         #                                that have access to
 425         #                                $firewall_myservices.
 426         #  firewall_trusted:            List of IPv4 and/or IPv6 addresses
 427         #                                that have full access to this host.
 428         #                                Be very careful when setting this.
 429         #                                This option can seriously degrade
 430         #                                the level of protection provided by
 431         #                                the firewall.
 432         #  firewall_logdeny:            Boolean (YES/NO) specifying if the
 433         #                                default denied packets should be
 434         #                                logged (in /var/log/security).
 435         #  firewall_nologports:         List of TCP/UDP ports for which
 436         #                                denied incoming packets are not
 437         #                                logged.
 438
 439         # Allow packets for which a state has been built.
 440         ${fwcmd} add check-state
 441
 442         # For services permitted below.
 443         ${fwcmd} add pass tcp  from me to any established
 444
 445         # Allow any connection out, adding state for each.
 446         ${fwcmd} add pass tcp  from me to any setup keep-state
 447         ${fwcmd} add pass udp  from me to any       keep-state
 448         ${fwcmd} add pass icmp from me to any       keep-state
 449         if [ $ipv6_available -eq 0 ]; then
 450                 ${fwcmd} add pass ipv6-icmp from me to any keep-state
 451         fi
 452
 453         # Allow DHCP.
 454         ${fwcmd} add pass udp  from 0.0.0.0 68 to 255.255.255.255 67 out
 455         ${fwcmd} add pass udp  from any 67     to me 68 in
 456         ${fwcmd} add pass udp  from any 67     to 255.255.255.255 68 in
 457         if [ $ipv6_available -eq 0 ]; then
 458                 ${fwcmd} add pass udp from fe80::/10 to me 546 in
 459         fi
 460         # Some servers will ping the IP while trying to decide if it's
 461         # still in use.
 462         ${fwcmd} add pass icmp from any to any icmptype 8
 463         if [ $ipv6_available -eq 0 ]; then
 464                 ${fwcmd} add pass ipv6-icmp from any to any icmp6type 128,129
 465         fi
 466
 467         # Allow "mandatory" ICMP in.
 468         ${fwcmd} add pass icmp from any to any icmptype 3,4,11
 469         if [ $ipv6_available -eq 0 ]; then
 470                 ${fwcmd} add pass ipv6-icmp from any to any icmp6type 3
 471         fi
 472
 473         # Add permits for this workstations published services below
 474         # Only IPs and nets in firewall_allowservices is allowed in.
 475         # If you really wish to let anyone use services on your
 476         # workstation, then set "firewall_allowservices='any'" in /etc/rc.conf
 477         #
 478         # Note: We don't use keep-state as that would allow DoS of
 479         #       our statetable.
 480         #       You can add 'keep-state' to the lines for slightly
 481         #       better performance if you fell that DoS of your
 482         #       workstation won't be a problem.
 483         #
 484         for i in ${firewall_allowservices} ; do
 485           for j in ${firewall_myservices} ; do
 486             case $j in
 487             [0-9A-Za-z]*/[Pp][Rr][Oo][Tt][Oo])
 488               ${fwcmd} add pass ${j%/[Pp][Rr][Oo][Tt][Oo]} from $i to me
 489             ;;
 490             [0-9A-Za-z]*/[Tt][Cc][Pp])
 491               ${fwcmd} add pass tcp from $i to me ${j%/[Tt][Cc][Pp]}
 492             ;;
 493             [0-9A-Za-z]*/[Uu][Dd][Pp])
 494               ${fwcmd} add pass udp from $i to me ${j%/[Uu][Dd][Pp]}
 495             ;;
 496             *[0-9A-Za-z])
 497               echo "Consider using ${j}/tcp in firewall_myservices." \
 498                 > /dev/stderr
 499               ${fwcmd} add pass tcp from $i to me $j
 500             ;;
 501             *)
 502               echo "Invalid port in firewall_myservices: $j" > /dev/stderr
 503             ;;
 504             esac
 505           done
 506         done
 507
 508         # Allow all connections from trusted IPs.
 509         # Playing with the content of firewall_trusted could seriously
 510         # degrade the level of protection provided by the firewall.
 511         for i in ${firewall_trusted} ; do
 512           ${fwcmd} add pass ip from $i to me
 513         done
 514
 515         ${fwcmd} add 65000 count ip from any to any
 516
 517         # Drop packets to ports where we don't want logging
 518         for i in ${firewall_nologports} ; do
 519           ${fwcmd} add deny { tcp or udp } from any to any $i in
 520         done
 521
 522         # Broadcasts and multicasts
 523         ${fwcmd} add deny ip  from any to 255.255.255.255
 524         ${fwcmd} add deny ip  from any to 224.0.0.0/24 in       # XXX
 525
 526         # Noise from routers
 527         ${fwcmd} add deny udp from any to any 520 in
 528
 529         # Noise from webbrowsing.
 530         # The stateful filter is a bit aggressive, and will cause some
 531         #  connection teardowns to be logged.
 532         ${fwcmd} add deny tcp from any 80,443 to any 1024-65535 in
 533
 534         # Deny and (if wanted) log the rest unconditionally.
 535         log=""
 536         if [ ${firewall_logdeny:-x} = "YES" -o ${firewall_logdeny:-x} = "yes" ] ; then
 537           log="log logamount 500"       # The default of 100 is too low.
 538           sysctl net.inet.ip.fw.verbose=1 >/dev/null
 539         fi
 540         ${fwcmd} add deny $log ip from any to any
 541         ;;
 542
 543 [Cc][Ll][Oo][Ss][Ee][Dd])
 544         ${fwcmd} add 65000 deny ip from any to any
 545         ;;
 546 [Uu][Nn][Kk][Nn][Oo][Ww][Nn])
 547         ;;
 548 *)
 549         if [ -r "${firewall_type}" ]; then
 550                 ${fwcmd} ${firewall_flags} ${firewall_type}
 551         fi
 552         ;;
 553 esac