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Add a 'block' rule prior to the state creating 'pass' rule. This
way, TCP packets of e.g. timed out states are blocked rather than
passed by the implicit default pass rule.

sthen@ benno@ phessler@ mikeb@ agrees

#	$OpenBSD: pf.conf,v 1.52 2013/02/13 23:11:14 halex Exp $
#
# See pf.conf(5) for syntax and examples.
# Remember to set net.inet.ip.forwarding=1 and/or net.inet6.ip6.forwarding=1
# in /etc/sysctl.conf if packets are to be forwarded between interfaces.

# increase default state limit from 10'000 states on busy systems
#set limit states 100000

set skip on lo

# filter rules and anchor for ftp-proxy(8)
#anchor "ftp-proxy/*"
#pass in quick inet proto tcp to port ftp divert-to 127.0.0.1 port 8021

# anchor for relayd(8)
#anchor "relayd/*"

block		# block stateless traffic
pass		# establish keep-state

# rules for spamd(8)
#table <spamd-white> persist
#table <nospamd> persist file "/etc/mail/nospamd"
#pass in on egress proto tcp from any to any port smtp \
#    rdr-to 127.0.0.1 port spamd
#pass in on egress proto tcp from <nospamd> to any port smtp
#pass in log on egress proto tcp from <spamd-white> to any port smtp
#pass out log on egress proto tcp to any port smtp


#block in quick from urpf-failed to any	# use with care

# By default, do not permit remote connections to X11
block in on ! lo0 proto tcp to port 6000:6010