83 lines
3.9 KiB
Bash
Executable file
83 lines
3.9 KiB
Bash
Executable file
#!/bin/bash
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# The name of the main external interface.
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EX_IF="br0"
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# Disable ICMP redirects.
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# Note: Redirects are used when a router believes a packet is being routed sub optimally and it would like to inform
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# the sending host that it should forward subsequent packets to that same destination through a different gateway.
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echo 0 >"/proc/sys/net/ipv4/conf/$EX_IF/accept_redirects"
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echo 0 >"/proc/sys/net/ipv6/conf/$EX_IF/accept_redirects"
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echo 0 >"/proc/sys/net/ipv4/conf/$EX_IF/send_redirects"
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# Flush old rules.
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iptables -F
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ip6tables -F
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iptables -t nat -F
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ip6tables -t nat -F
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iptables -t mangle -F
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ip6tables -t mangle -F
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# Delete any custom chains.
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iptables -X
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ip6tables -X
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iptables -t nat -X
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ip6tables -t nat -X
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iptables -t mangle -X
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ip6tables -t mangle -X
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# Drop invalid packets on all interfaces.
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iptables -A INPUT -m conntrack --ctstate INVALID -j DROP
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ip6tables -A INPUT -m conntrack --ctstate INVALID -j DROP
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# Drop unroutable IPs on the external interface.
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iptables -A INPUT -i "$EX_IF" -s 127.0.0.0/8 -j DROP
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ip6tables -A INPUT -i "$EX_IF" -s ::1/128 -j DROP
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iptables -A INPUT -i "$EX_IF" -s 10.0.0.0/8 -j DROP
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iptables -A INPUT -i "$EX_IF" -s 172.16.0.0/12 -j DROP
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iptables -A INPUT -i "$EX_IF" -s 192.168.0.0/16 -j DROP
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# Allow all loopback traffic.
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iptables -A INPUT -i lo -j ACCEPT
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ip6tables -A INPUT -i lo -j ACCEPT
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# Allow unrestricted access from our IPs.
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iptables -A INPUT -i "$EX_IF" -m iprange --src-range 91.109.244.7-91.109.244.11 -j ACCEPT
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iptables -A INPUT -i "$EX_IF" -m iprange --src-range 91.109.244.78-91.109.244.79 -j ACCEPT
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iptables -A INPUT -i "$EX_IF" -m iprange --src-range 91.109.244.239-91.109.244.243 -j ACCEPT
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ip6tables -A INPUT -i "$EX_IF" -s 2a02:2498:1:227::/64 -j ACCEPT
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iptables -A INPUT -i "$EX_IF" -s 185.176.90.169 -j ACCEPT
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ip6tables -A INPUT -i "$EX_IF" -s 2a07:4580:b0d:57f::/64 -j ACCEPT
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# Allow packets of established connections and those related to them.
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iptables -A INPUT -i "$EX_IF" -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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ip6tables -A INPUT -i "$EX_IF" -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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# Allow pings, but ratelimited.
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iptables -A INPUT -i "$EX_IF" -p icmp --icmp-type echo-request -m limit --limit 1/sec --limit-burst 5 -j ACCEPT
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ip6tables -A INPUT -i "$EX_IF" -p icmpv6 --icmpv6-type echo-request -m limit --limit 1/sec --limit-burst 5 -j ACCEPT
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iptables -A INPUT -i "$EX_IF" -p icmp --icmp-type echo-reply -m limit --limit 1/sec --limit-burst 5 -j ACCEPT
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ip6tables -A INPUT -i "$EX_IF" -p icmpv6 --icmpv6-type echo-reply -m limit --limit 1/sec --limit-burst 5 -j ACCEPT
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# Allow certain types of ICMP informational packets.
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iptables -A INPUT -i "$EX_IF" -p icmp --icmp-type destination-unreachable -j ACCEPT
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ip6tables -A INPUT -i "$EX_IF" -p icmpv6 --icmpv6-type destination-unreachable -j ACCEPT
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iptables -A INPUT -i "$EX_IF" -p icmp --icmp-type time-exceeded -j ACCEPT
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ip6tables -A INPUT -i "$EX_IF" -p icmpv6 --icmpv6-type time-exceeded -j ACCEPT
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iptables -A INPUT -i "$EX_IF" -p icmp --icmp-type parameter-problem -j ACCEPT
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ip6tables -A INPUT -i "$EX_IF" -p icmpv6 --icmpv6-type parameter-problem -j ACCEPT
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ip6tables -A INPUT -i "$EX_IF" -p icmpv6 --icmpv6-type packet-too-big -j ACCEPT
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# Always allow SSH.
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# Note: We never want to be locked out of the system, so also accept on the standard ssh port, just in case things accidently get
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# set back to defaults. Any connections to the standard port will just get a 'connection refused' message, unless this happens.
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iptables -A INPUT -i "$EX_IF" -p tcp --syn -m multiport --dports 22,9922 -m conntrack --ctstate NEW -j ACCEPT
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ip6tables -A INPUT -i "$EX_IF" -p tcp --syn -m multiport --dports 22,9922 -m conntrack --ctstate NEW -j ACCEPT
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# Set default policies.
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iptables -P INPUT DROP
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ip6tables -P INPUT DROP
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iptables -P OUTPUT ACCEPT # We don't firewall outgoing connections.
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ip6tables -P OUTPUT ACCEPT # We don't firewall outgoing connections.
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iptables -P FORWARD DROP
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ip6tables -P FORWARD DROP
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