[11] | 1 | # |
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| 2 | # rules.before |
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| 3 | # |
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| 4 | # Rules that should be run before the ufw command line added rules. Custom |
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| 5 | # rules should be added to one of these chains: |
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| 6 | # ufw-before-input |
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| 7 | # ufw-before-output |
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| 8 | # ufw-before-forward |
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| 9 | # |
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| 10 | |
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| 11 | # Don't delete these required lines, otherwise there will be errors |
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| 12 | *filter |
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| 13 | :ufw-before-input - [0:0] |
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| 14 | :ufw-before-output - [0:0] |
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| 15 | :ufw-before-forward - [0:0] |
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| 16 | :ufw-not-local - [0:0] |
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| 17 | # End required lines |
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| 18 | |
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| 19 | |
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| 20 | # allow all on loopback |
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| 21 | -A ufw-before-input -i lo -j ACCEPT |
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| 22 | -A ufw-before-output -i lo -j ACCEPT |
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| 23 | |
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| 24 | # connection tracking rules |
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| 25 | -A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT |
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| 26 | |
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| 27 | # drop INVALID packets |
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| 28 | # uncomment to log INVALID packets |
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| 29 | #-A ufw-before-input -m conntrack --ctstate INVALID -j LOG --log-prefix "[UFW BLOCK INVALID]: " |
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| 30 | -A ufw-before-input -m conntrack --ctstate INVALID -j DROP |
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| 31 | |
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| 32 | # connection tracking for outbound |
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| 33 | -A ufw-before-output -p tcp -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT |
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| 34 | -A ufw-before-output -p udp -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT |
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| 35 | |
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| 36 | # ok icmp codes |
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| 37 | -A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT |
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| 38 | -A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT |
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| 39 | -A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT |
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| 40 | -A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT |
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| 41 | -A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT |
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| 42 | |
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| 43 | # allow dhcp client to work |
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| 44 | -A ufw-before-input -p udp --sport 67 --dport 68 -j ACCEPT |
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| 45 | |
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| 46 | # |
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| 47 | # ufw-not-local |
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| 48 | # |
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| 49 | -A ufw-before-input -j ufw-not-local |
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| 50 | |
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| 51 | # if LOCAL, RETURN |
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| 52 | -A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN |
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| 53 | |
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| 54 | # if MULTICAST, RETURN |
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| 55 | -A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN |
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| 56 | |
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| 57 | # if BROADCAST, RETURN |
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| 58 | -A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN |
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| 59 | |
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| 60 | -A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j LOG --log-prefix "[UFW BLOCK NOT-TO-ME]: " |
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| 61 | |
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| 62 | # all other non-local packets are dropped |
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| 63 | -A ufw-not-local -j DROP |
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| 64 | |
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| 65 | # allow MULTICAST, be sure the MULTICAST line above is uncommented |
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| 66 | -A ufw-before-input -s 224.0.0.0/4 -j ACCEPT |
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| 67 | -A ufw-before-input -d 224.0.0.0/4 -j ACCEPT |
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| 68 | |
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| 69 | |
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| 70 | # don't delete the 'COMMIT' line or these rules won't be processed |
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| 71 | COMMIT |
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