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