Do you have an updated list of firewall rules for iptables?
Hi All:
Does anyone have an updated list of rules for IPTABLES? I will post what I have so far: # Modify this file accordingly for your specific requirement. # http://www.thegeekstuff.com # 1. Delete all existing rules iptables -F # 2. Set default chain policies iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT DROP # 3. Block a specific ip-address #BLOCK_THIS_IP="x.x.x.x" #iptables -A INPUT -s "$BLOCK_THIS_IP" -j DROP # 4. Allow ALL incoming SSH #iptables -A INPUT -i eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT #iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT # 5. Allow incoming SSH only from a sepcific network #iptables -A INPUT -i eth0 -p tcp -s 192.168.200.0/24 --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT #iptables -A OUTPUT -o eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT # 6. Allow incoming HTTP #iptables -A INPUT -i eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT #iptables -A OUTPUT -o eth0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT # Allow incoming HTTPS #iptables -A INPUT -i eth0 -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT #iptables -A OUTPUT -o eth0 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT # 7. MultiPorts (Allow incoming SSH, HTTP, and HTTPS) iptables -A INPUT -i eth0 -p tcp -m multiport --dports 22,80,443 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp -m multiport --sports 22,80,443 -m state --state ESTABLISHED -j ACCEPT # 8. Allow outgoing SSH iptables -A OUTPUT -o eth0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT # 9. Allow outgoing SSH only to a specific network #iptables -A OUTPUT -o eth0 -p tcp -d 192.168.101.0/24 --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT #iptables -A INPUT -i eth0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT # 10. Allow outgoing HTTPS iptables -A OUTPUT -o eth0 -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT # 11. Load balance incoming HTTPS traffic #iptables -A PREROUTING -i eth0 -p tcp --dport 443 -m state --state NEW -m nth --counter 0 --every 3 --packet 0 -j DNAT --to-destination 192.168.1.101:443 #iptables -A PREROUTING -i eth0 -p tcp --dport 443 -m state --state NEW -m nth --counter 0 --every 3 --packet 1 -j DNAT --to-destination 192.168.1.102:443 #iptables -A PREROUTING -i eth0 -p tcp --dport 443 -m state --state NEW -m nth --counter 0 --every 3 --packet 2 -j DNAT --to-destination 192.168.1.103:443 # 12. Ping from inside to outside iptables -A OUTPUT -p icmp --icmp-type echo-request -j ACCEPT iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT # 13. Ping from outside to inside iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT # 14. Allow loopback access iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ACCEPT # 15. Allow packets from internal network to reach external network. # if eth1 is connected to external network (internet) # if eth0 is connected to internal network (192.168.1.x) iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT # 16. Allow outbound DNS #iptables -A OUTPUT -p udp -o eth0 --dport 53 -j ACCEPT #iptables -A INPUT -p udp -i eth0 --sport 53 -j ACCEPT # 17. Allow NIS Connections # rpcinfo -p | grep ypbind ; This port is 853 and 850 #iptables -A INPUT -p tcp --dport 111 -j ACCEPT #iptables -A INPUT -p udp --dport 111 -j ACCEPT #iptables -A INPUT -p tcp --dport 853 -j ACCEPT #iptables -A INPUT -p udp --dport 853 -j ACCEPT #iptables -A INPUT -p tcp --dport 850 -j ACCEPT #iptables -A INPUT -p udp --dport 850 -j ACCEPT # 18. Allow rsync from a specific network iptables -A INPUT -i eth0 -p tcp -s 192.168.101.0/24 --dport 873 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 873 -m state --state ESTABLISHED -j ACCEPT # 19. Allow MySQL connection only from a specific network iptables -A INPUT -i eth0 -p tcp -s 192.168.200.0/24 --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 3306 -m state --state ESTABLISHED -j ACCEPT # 20. Allow Sendmail or Postfix iptables -A INPUT -i eth0 -p tcp --dport 25 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 25 -m state --state ESTABLISHED -j ACCEPT # 21. Allow IMAP and IMAPS iptables -A INPUT -i eth0 -p tcp --dport 143 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 143 -m state --state ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --dport 993 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 993 -m state --state ESTABLISHED -j ACCEPT # 22. Allow POP3 and POP3S iptables -A INPUT -i eth0 -p tcp --dport 110 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 110 -m state --state ESTABLISHED -j ACCEPT iptables -A INPUT -i eth0 -p tcp --dport 995 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 995 -m state --state ESTABLISHED -j ACCEPT # 23. Prevent DoS attack iptables -A INPUT -p tcp --dport 80 -m limit --limit 25/minute --limit-burst 100 -j ACCEPT # 24. Port forwarding 422 to 22 iptables -t nat -A PREROUTING -p tcp -d 192.168.102.37 --dport 422 -j DNAT --to 192.168.102.37:22 iptables -A INPUT -i eth0 -p tcp --dport 422 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -o eth0 -p tcp --sport 422 -m state --state ESTABLISHED -j ACCEPT # 25. Log dropped packets iptables -N LOGGING iptables -A INPUT -j LOGGING iptables -A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPTables Packet Dropped: " --log-level 7 iptables -A LOGGING -j DROP |
I just use the Easy Firewall Generator found here.
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Or Shorewall on Slackbuilds.org, though the one at Slackbuilds is a little old, the latest is 4.6.0.1.
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unspawn - what I meant to say and didn't was that I believe there are more sophisticated and useful rules against a variety of attacks that I don't have here. Does anyone have an improved rule set.
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- what (publicly accessible) services are or should be running*, - how is access to those services controlled (if any), - what kind of attacks are you worrying about and - what measures are in place (GNU/Tiger, Samhain, Snort, Logwatch, fail2ban to name a few) right now? *If applicable please pay special attention to anything running in the web stack like control panels, web logs, CMSes, photo galleries, shopping carts and their respective vendor-supplied and third party themes, plugins and whatnot. |
I like the one posted here ;)
http://docs.slackware.com/howtos:security:ssh?s[]=connmark#alternate_method_of_changing_the_ssh_default_port_without_changing Just a port game Is this PAT? like NAT ? Port Address Translation / Network Address Translation Good starter kits mentioned above... |
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