Linux Server Build Checklist

• The purpose of the server is clear
  • Who will use the server / via what ports? What services?
  • What software will be installed
• interface configuration is correct
• routing table is correct
• minimal software stack is installed. unneeded stuff removed ( bluetooth, gnome )
• Time services ( Ntp | PTP )
• Logging services - kern.* /var/log/kernel.log + logrotate
• ssh updated, and locked down ( no remore root, no version 1 protocol , keys only )
• open ssl updated
• kernel updated
• Password policy updated.
• update system working: yum , checking in , registered.
• users defined and locked down.
• service list defined and locked down.
• selinux setup as needed
• iptables / firewall.

Basic default allow + logging iptables:

/sbin/iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
/sbin/iptables -A INPUT -p udp -m multiport --dports 53,5353 -j ACCEPT # example 
/sbin/iptables -A INPUT -p tcp -m state --state NEW -m multiport --dports 22,53,80,443:3000 -j ACCEPT # example
/sbin/iptables -A INPUT -m limit --limit 6/min -j LOG --log-prefix "INPUT "
/sbin/iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
/sbin/iptables -A OUTPUT -m limit --limit 6/min -j LOG --log-prefix "OUTPUT "

• server is monitored properly.
• timestamp in bash history: "export HISTTIMEFORMAT='%F %T '"
• Hardened ( http://www.nsa.gov/ia/_files/factsheets/rhel5-pamphlet-i731.pdf )
• check list: ( http://security.utexas.edu/admin/redhat-linux.html )