Warren wrote:
I just converted my outgoing mail server from sendmail to
qmail-toaster. Love those centos scripts :)
As I am only using this server for my outgoing mail, it is essentially
an open relay but with no way to get to port 25 except from my local
network, I was wondering how I can properly shut down all of the
unneeded services such as squirrelmail, the admin interface, etc. I am
just using the box as an outgoing mail relay so that my incoming box
does not get bogged down with the roughly half-million outgoing emails
we process every week.
Here's a firewall script that I use on a couple machine. Has separate
incoming/outgoing port rules, and everything else is denied. Just
comment out the ports you don't want open (either for incoming and/or
outgoing). Nick also has a firewall script on his site, if you read his
install.
# import this saved configuration into your iptables configuration with
the following command:
# iptables-restore < web_server.config
*nat
:PREROUTING ACCEPT [127173:7033011]
:POSTROUTING ACCEPT [31583:2332178]
:OUTPUT ACCEPT [32021:2375633]
COMMIT
*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
COMMIT
*filter
:INPUT DROP [1:242]
:FORWARD DROP [0:0]
:OUTPUT DROP [0:0]
:icmp_packets - [0:0]
-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 43 -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 udp -m udp --dport 123 -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 783 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 993 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 8822 -j ACCEPT
#-A INPUT -p tcp -m tcp --dport 9283 -j ACCEPT
#-A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 10000 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 10001 -j ACCEPT
#-A INPUT -p tcp -m tcp --dport 12000 -j ACCEPT
#-A INPUT -p tcp -m tcp --dport 15000 -j ACCEPT
-A INPUT -s 127.0.0.1 -j ACCEPT
-A INPUT -p icmp -j icmp_packets
-A INPUT -j LOG --log-prefix "IPTABLES-IN Default Drop: " --log-level 7
-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 tcp -m tcp --dport 22 -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 23 -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 25 -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 80 -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 110 -j ACCEPT
-A OUTPUT -p udp -m udp --dport 123 -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 143 -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 443 -j ACCEPT
#-A OUTPUT -p tcp -m tcp --dport 783 -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 993 -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 8822 -j ACCEPT
#-A OUTPUT -p tcp -m tcp --dport 9283 -j ACCEPT
#-A OUTPUT -p tcp -m tcp --dport 3306 -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 10000 -j ACCEPT
-A OUTPUT -p tcp -m tcp --dport 10001 -j ACCEPT
#-A OUTPUT -p tcp -m tcp --dport 12000 -j ACCEPT
#-A OUTPUT -p tcp -m tcp --dport 15000 -j ACCEPT
#-A OUTPUT -p tcp -m tcp --dport 2210 -j ACCEPT
-A OUTPUT -d 127.0.0.1 -j ACCEPT
-A OUTPUT -p icmp -j icmp_packets
-A OUTPUT -j LOG --log-prefix "IPTABLES-OUT Default Drop: " --log-level 7
-A icmp_packets -p icmp -m icmp --icmp-type 0 -j ACCEPT
-A icmp_packets -s 127.0.0.1 -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A icmp_packets -p icmp -m icmp --icmp-type 8 -j DROP
-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
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