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LINUX Security

LINUX Security. Do we need Security?. Problems!. Clear text Data Transfer Problems Examples: 1) Corporate Communication 2) Information exchanges 3) Email. How do we solve the Problem. Firewalls Encryption Technologies VPNs. LINUX Firewalls.

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LINUX Security

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  1. LINUX Security

  2. Do we need Security?

  3. Problems! Clear text Data Transfer Problems Examples: 1) Corporate Communication 2) Information exchanges 3) Email

  4. How do we solve the Problem Firewalls Encryption Technologies VPNs

  5. LINUX Firewalls • IPTABLES (comes pre-built on LINUX system) • SE-LINUX • Source Forge

  6. IPTABLES Example: *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUP –tap0 –j ACCEPT -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p 50 -j ACCEPT -A RH-Firewall-1-INPUT -p 51 -j ACCEPT -A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5000 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 5000 -j ACCEPT COMMIT

  7. IPTABLES -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 25 -j ACCEPT

  8. IPTABLES References Troubleshooting LINUX Firewalls By Michael Shinn and Scott Shinn http://iptables-tutorial.frozentux.net/iptables-tutorial.html

  9. VPN / Tunnels

  10. Tunnels/VPN VPN Secure communications to server IPSEC PPTP OPENVPN

  11. SQUID Utility to filter and Cache Websites http://www.squid-cache.org/Doc/Hierarchy-Tutorial/ Porn1 file available from http://members.lycos.co.uk/njadmin/

  12. Futures openCA Selfdefending networks 802.1x User authentications enhancements

  13. Questions? Bill Tabor bill.tabor@myacc.net billt@dataquesttech.com

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