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Does anyone know an easy way of importing the output of the iptables -L command back into iptables? I was trying to do some automated firewall rules via a bash ...
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- 04-30-2013 #1Just Joined!
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Import the output of iptables -L back into iptables
Does anyone know an easy way of importing the output of the iptables -L command back into iptables? I was trying to do some automated firewall rules via a bash script and I accidentally blew away all my rules by issuing an iptables -f and then saving them to /etc/sysconfig/iptables
Fortunately, I was able to go back in my session window and get the rules as I had issued an iptables -L earlier.
Here is basically the gist of my rules:
Thanks for any help you can provide.Code:Chain INPUT (policy ACCEPT) target prot opt source destination acctboth all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination acctboth all -- anywhere anywhere Chain acctboth (2 references) target prot opt source destination tcp -- 10.0.0.69 anywhere tcp dpt:http tcp -- anywhere 10.0.0.69 tcp spt:http tcp -- 10.0.0.69 anywhere tcp dpt:smtp tcp -- anywhere 10.0.0.69 tcp spt:smtp tcp -- 10.0.0.69 anywhere tcp dpt:pop3 tcp -- anywhere 10.0.0.69 tcp spt:pop3 icmp -- 10.0.0.69 anywhere icmp -- anywhere 10.0.0.69 tcp -- 10.0.0.69 anywhere tcp -- anywhere 10.0.0.69 udp -- 10.0.0.69 anywhere udp -- anywhere 10.0.0.69 all -- 10.0.0.69 anywhere all -- anywhere 10.0.0.69 #The Mangle portion of the ruleset. Here is where unwanted packet types get dropped. #This helps in making port scans against your server a bit more time consuming and difficult, but not impossible. *mangle :PREROUTING ACCEPT [444:43563] :INPUT ACCEPT [444:43563] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [402:144198] :POSTROUTING ACCEPT [402:144198] -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j DROP -A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP COMMIT #The FILTER section of the ruleset is where we initially drop all packets and then selectively open certain ports. *filter :INPUT DROP [1:242] :FORWARD DROP [0:0] :OUTPUT DROP [0:0] :icmp_packets - [0:0] #Inbound -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p tcp -m tcp --dport 20 -j ACCEPT -A INPUT -p tcp -m tcp --dport 21 -j ACCEPT -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -p tcp -m tcp --dport 25 -j ACCEPT -A INPUT -p tcp -m tcp --dport 26 -j ACCEPT -A INPUT -p tcp -m tcp --dport 53 -j ACCEPT -A INPUT -p udp -m udp --dport 53 -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT -A INPUT -p tcp -m tcp --dport 110 -j ACCEPT -A INPUT -p tcp -m tcp --dport 143 -j ACCEPT -A INPUT -p tcp -m tcp --dport 443 -j ACCEPT -A INPUT -p tcp -m tcp --dport 465 -j ACCEPT -A INPUT -p udp -m udp --dport 465 -j ACCEPT -A INPUT -p tcp -m tcp --dport 873 -j ACCEPT -A INPUT -p udp -m udp --dport 873 -j ACCEPT -A INPUT -p tcp -m tcp --dport 993 -j ACCEPT -A INPUT -p udp -m udp --dport 993 -j ACCEPT -A INPUT -p tcp -m tcp --dport 995 -j ACCEPT -A INPUT -p tcp -m tcp --dport 783 -j ACCEPT -A INPUT -p tcp -m tcp --dport 2078 -j ACCEPT -A INPUT -p tcp -m tcp --dport 2083 -j ACCEPT -A INPUT -p tcp -m tcp --dport 2087 -j ACCEPT -A INPUT -p tcp -m tcp --dport 2089 -j ACCEPT -A INPUT -p tcp -m tcp --dport 2096 -j ACCEPT -A INPUT -p tcp -m tcp --dport 6666 -j ACCEPT -A INPUT -s 127.0.0.1 -j ACCEPT -A INPUT -p icmp -j icmp_packets #Outbound -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 20 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 21 -j ACCEPT -A OUTPUT -p udp -m udp --dport 21 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 22 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 25 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 26 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 43 -j ACCEPT -A OUTPUT -p udp -m udp --dport 53 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 53 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 80 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 113 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 465 -j ACCEPT -A OUTPUT -p udp -m udp --dport 465 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 873 -j ACCEPT -A OUTPUT -p udp -m udp --dport 873 -j ACCEPT -A OUTPUT -p tcp -m tcp --dport 2078 -j ACCEPT -A OUTPUT -p udp -m udp --dport 2078 -j ACCEPT -A OUTPUT -d 127.0.0.1 -j ACCEPT -A OUTPUT -p icmp -j icmp_packets #Accept and respond to ICMP requests -A icmp_packets -p icmp -m icmp --icmp-type 0 -j ACCEPT -A icmp_packets -p icmp -m icmp --icmp-type 8 -j ACCEPT -A icmp_packets -p icmp -m icmp --icmp-type 3 -j ACCEPT -A icmp_packets -p icmp -m icmp --icmp-type 11 -j ACCEPT COMMIT # Iptables firewall reset script *filter :INPUT ACCEPT [164:15203] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [147:63028] COMMIT *mangle :PREROUTING ACCEPT [164:15203] :INPUT ACCEPT [164:15203] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [147:63028] :POSTROUTING ACCEPT [147:63028] COMMIT *nat :PREROUTING ACCEPT [14:672] :POSTROUTING ACCEPT [9:684] :OUTPUT ACCEPT [9:684] COMMIT
- 05-01-2013 #2Trusted Penguin
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hello and welcome!
i usually use the command iptables-save for this purpose, e.g.:
Code:iptables-save > /etc/sysconfig/iptables.new
- 05-01-2013 #3Linux Guru
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Or is you are using REDHAT or one of its forks
Code:service iptables save
- 05-01-2013 #4Just Joined!
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That's normally what I would do in order to get it exported in a format proper for importing straight in again. Then, I could just do a:
Originally Posted by atreyu 
But in this case, I don't have the working firewall rules in iptables anymore. All I was able to recover was the output ofCode:/sbin/iptables-restore < /etc/sysconfig/iptables.new
from my session, unfortunately.Code:iptables -L
- 05-02-2013 #5Trusted Penguin
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oh, now i understand (i think): you can't issue an "iptables-save" (or "service iptables save") b/c your current rules are messed up. but in a terminal, you still have the output of "iptables -L" that you can copy-paste, etc., in order to create a new /etc/sysconfig/iptables file - is that right?
- 05-02-2013 #6Linux Guru
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The above you should be able to remove all line that do not start with an '-A' and then place 'iptables' in front of the '-A' and then save the file make it executable and run it to add these rules to your firewall. After that you would just hae to rebuild your chain rules. Originally Posted by LuditeITGuy
I would suggest making a backup copy of your firewall config in the future
- 05-06-2013 #7Just Joined!
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Thanks for the help! I absolutely will be making numerous backups of the rules in different places before I try scripting out iptables again.
What do you mean exactly when you say rebuild my chain rules?
Thanks again.
- 05-06-2013 #8Linux Guru
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Code:Chain acctboth (2 references) target prot opt source destination tcp -- 10.0.0.69 anywhere tcp dpt:http tcp -- anywhere 10.0.0.69 tcp spt:http tcp -- 10.0.0.69 anywhere tcp dpt:smtp tcp -- anywhere 10.0.0.69 tcp spt:smtp tcp -- 10.0.0.69 anywhere tcp dpt:pop3 tcp -- anywhere 10.0.0.69 tcp spt:pop3 icmp -- 10.0.0.69 anywhere icmp -- anywhere 10.0.0.69 tcp -- 10.0.0.69 anywhere tcp -- anywhere 10.0.0.69 udp -- 10.0.0.69 anywhere udp -- anywhere 10.0.0.69 all -- 10.0.0.69 anywhere all -- anywhere 10.0.0.69
- 05-06-2013 #9Just Joined!
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Thanks, I'll give that a shot.
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