freebsd 8

[Kurt Turner]

Hello all

In an effort not to create yet another insecure server on the www I'd like
to ensure my pf.conf file is good and secure - will someone please review
this configuration and let me know your thoughts?

I only want to allow www and ssh inbound and have limited access also
outbound - this is a remote web server I do not have access to at all. TIA

 #### First declare a couple of variables ####
# outgoing services
tcp_services = "{ ssh, smtp, domain, www, https, ntp, 43}"
udp_services = "{ domain, ntp }"
martians = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8,
169.254.0.0/16, 192.0.2.0/24, 0.0.0.0/8, 240.0.0.0/4 }"
ext_if = "re0" # Internet

#### Normalization
scrub in all

#### Start filtering
# Drop incoming everything
block in all

# Default connection refused message to client
block return

# keep stats of outging connections
pass out keep state

# activate spoofing protection for all interfaces
block in quick from urpf-failed

# Antispoof is a common special case of filtering and blocking. This
mechanism protects against activity from spoofed or forged IP addresses
antispoof log for $ext_if

#Block RFC 1918 addresses
block drop in log (all)  quick on $ext_if from $martians to any
block drop out log (all) quick on $ext_if from any to $martians

# Allow outgoing via ssh, smtp, domain, www, https, whois etc
pass out on $ext_if proto tcp to any port $tcp_services
pass out on $ext_if proto udp to any port $udp_services

# Allow outgoing Trace route
pass out on $ext_if inet proto udp from any to any port 33433 >< 33626 keep
state

# Allow http traffic
pass in on $ext_if proto tcp from any to any port 80 flags S/SA synproxy
modulate state
# SSH
pass in on $ext_if proto tcp from any to any port 22 flags S/SA synproxy
modulate state