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48 lines
2.1 KiB
Modula-2
48 lines
2.1 KiB
Modula-2
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############################################################################
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# Shorewall 1.3 -- /etc/shorewall/common.def
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#
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# This file defines the rules that are applied before a policy of
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# DROP or REJECT is applied. In addition to the rules defined in this file,
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# the firewall will also define a DROP rule for each subnet broadcast
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# address defined in /etc/shorewall/interfaces (including "detect").
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#
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# Do not modify this file -- if you wish to change these rules, create
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# /etc/shorewall/common to replace it. It is suggested that you include
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# the command "source /etc/shorewall/common.def" in your
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# /etc/shorewall/common file so that you will continue to get the
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# advantage of new releases of this file.
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#
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run_iptables -A common -p icmp -j icmpdef
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############################################################################
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# Drop invalid state TCP packets
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#
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run_iptables -A common -m state -p tcp --state INVALID -j DROP
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############################################################################
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# accept ACKs and RSTs that aren't related to any session so that the
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# protocol stack can handle them and so the ACKs can create connection
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# tracking entries.
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#
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run_iptables -A common -p tcp --tcp-flags ACK ACK -j ACCEPT
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run_iptables -A common -p tcp --tcp-flags RST RST -j ACCEPT
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############################################################################
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# NETBIOS chatter
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#
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run_iptables -A common -p udp --dport 137:139 -j REJECT
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run_iptables -A common -p udp --dport 445 -j REJECT
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run_iptables -A common -p tcp --dport 135 -j reject
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############################################################################
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# UPnP
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#
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run_iptables -A common -p udp --dport 1900 -j DROP
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############################################################################
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# BROADCASTS
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#
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run_iptables -A common -d 255.255.255.255 -j DROP
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run_iptables -A common -d 224.0.0.0/4 -j DROP
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############################################################################
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# AUTH -- Silently reject it so that connections don't get delayed.
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#
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run_iptables -A common -p tcp --dport 113 -j reject
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