Уважаемые,я тут с помощью man, ваших рекомендаций и инета подготовил rc.firewall.
Что думаете?
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fwcmd=/sbin/ipfw
oif="dco"
onet="10.x.y.0"
omask="255.255.255.0"
oip="10.x.y.2"
# Set these to your inside interface network and netmask and ip.
iif="bge0"
inet="192.168.y.0"
imask="255.255.255.0"
iip="192.168.y.15"
# Allow communications through loopback interface and deny 127.0.0.1/8
# from any other interfaces
setup_loopback
# Stop spoofing
${fwcmd} add deny log all from ${inet}:${imask} to any in via ${oif}
${fwcmd} add deny log all from ${onet}:${omask} to any in via ${iif}
# Stop RFC1918 nets on the outside interface
${fwcmd} add deny log all from any to 10.0.0.0/8 via ${oif}
${fwcmd} add deny log all from any to 172.16.0.0/12 via ${oif}
${fwcmd} add deny log all from any to 192.168.y.0/16 via ${oif}
# Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
# DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E),
# RFC 3330 nets on the outside interface
${fwcmd} add deny log all from any to 0.0.0.0/8 via ${oif}
${fwcmd} add deny log all from any to 169.254.0.0/16 via ${oif}
${fwcmd} add deny log all from any to 192.0.2.0/24 via ${oif}
${fwcmd} add deny log all from any to 198.18.y.0/15 via ${oif}
${fwcmd} add deny log all from any to 224.0.0.0/4 via ${oif}
${fwcmd} add deny log all from any to 240.0.0.0/4 via ${oif}
# Network Address Translation. This rule is placed here deliberately
# so that it does not interfere with the surrounding address-checking
# rules. If for example one of your internal LAN machines had its IP
# address set to 192.168.0.2 then an incoming packet for it after being
# translated by natd(8) would match the `deny' rule above. Similarly
# an outgoing packet originated from it before being translated would
# match the `deny' rule below.
case ${natd_enable} in
[Yy][Ee][Ss])
if [ -n "${natd_interface}" ]; then
${fwcmd} add divert natd all from any to any via ${natd_interface}
fi
;;
esac
# Stop RFC1918 nets on the outside interface
${fwcmd} add deny log all from 10.0.0.0/8 to any via ${oif}
${fwcmd} add deny log all from 172.16.0.0/12 to any via ${oif}
${fwcmd} add deny log all from 192.168.y.0/16 to any via ${oif}
# Stop draft-manning-dsua-03.txt (1 May 2000) nets (includes RESERVED-1,
# DHCP auto-configuration, NET-TEST, MULTICAST (class D), and class E),
# RFC 3330 nets on the outside interface
${fwcmd} add deny log all from 0.0.0.0/8 to any via ${oif}
${fwcmd} add deny log all from 169.254.0.0/16 to any via ${oif}
${fwcmd} add deny log all from 192.0.2.0/24 to any via ${oif}
${fwcmd} add deny log all from 198.168.y.0/15 to any via ${oif}
${fwcmd} add deny log all from 224.0.0.0/4 to any via ${oif}
${fwcmd} add deny log all from 240.0.0.0/4 to any via ${oif}
# Allow anything on the internal net
${fwcmd} add allow all from any to any via ${iif}
# Allow anything outbound from this net.
${fwcmd} add allow all from ${onet}:${omask} to any out via ${oif}
# Deny anything outbound from other nets.
# ${fwcmd} add deny log all from any to any out via ${oif} # removed
# Allow TCP through if setup succeeded.
${fwcmd} add allow tcp from any to any established
# Allow IP fragments to pass through.
${fwcmd} add allow all from any to any frag
# Allow inbound ftp, ssh, email, tcp-dns, http, https, pop3, pop3s.
${fwcmd} add allow tcp from any to ${oip} 21 setup in via ${oif}
${fwcmd} add allow tcp from any to ${oip} 22 setup in via ${oif}
${fwcmd} add allow tcp from any to ${oip} 25 setup in via ${oif}
${fwcmd} add allow tcp from any to ${oip} 53 setup in via ${oif}
${fwcmd} add allow tcp from any to ${oip} 80 setup in via ${oif}
${fwcmd} add allow tcp from any to ${oip} 443 setup in via ${oif}
${fwcmd} add allow tcp from any to ${oip} 110 setup in via ${oif}
${fwcmd} add allow tcp from any to ${oip} 995 setup in via ${oif}
# Deny inbound auth, netbios, ldap, and Microsoft's DB protocol
# without logging.
${fwcmd} add deny tcp from any to ${oip} 113 setup in via ${oif}
${fwcmd} add deny tcp from any to ${oip} 139 setup in via ${oif}
${fwcmd} add deny tcp from any to ${oip} 389 setup in via ${oif}
${fwcmd} add deny tcp from any to ${oip} 445 setup in via ${oif}
# Deny some chatty UDP broadcast protocols without logging.
${fwcmd} add deny udp from any 137 to any in via ${oif}
${fwcmd} add deny udp from any to any 137 in via ${oif}
${fwcmd} add deny udp from any 138 to any in via ${oif}
${fwcmd} add deny udp from any 513 to any in via ${oif}
${fwcmd} add deny udp from any 525 to any in via ${oif}
# Allow inbound DNS and NTP replies. This is somewhat of a hole,
# since we're looking at the incoming port number, which can be
# faked, but that's just the way DNS and NTP work.
${fwcmd} add allow udp from any 53 to ${oip} in via ${oif}
${fwcmd} add allow udp from any 123 to ${oip} in via ${oif}
# Allow inbound DNS queries.
${fwcmd} add allow udp from any to ${oip} 53 in via ${oif}
# Deny inbound NTP queries without logging.
${fwcmd} add deny udp from any to ${oip} 123 in via ${oif}
# Allow traceroute to function, but not to get in.
${fwcmd} add unreach port udp from any to ${oip} 33435-33524 in via ${oif}
# Allow some inbound icmps - echo reply, dest unreach, source quench,
# echo, ttl exceeded.
${fwcmd} add allow icmp from any to any in via ${oif} icmptypes 0,3,4,8,11
# Broadcasts are denied and not logged.
${fwcmd} add deny all from any to 255.255.255.255
# Everything else is denied and logged.
${fwcmd} add deny log all from any to any
