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95 lines
3.4 KiB
Django/Jinja
95 lines
3.4 KiB
Django/Jinja
#### The mangle table
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# This table allows us to modify packet headers
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# Packets enter this table first
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#
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*mangle
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:PREROUTING ACCEPT [0:0]
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:INPUT ACCEPT [0:0]
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:FORWARD ACCEPT [0:0]
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:OUTPUT ACCEPT [0:0]
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:POSTROUTING ACCEPT [0:0]
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{% if max_mss is defined %}
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-A FORWARD -s {{ vpn_network }}{% if wireguard_enabled %},{{ wireguard_vpn_network }}{% endif %} -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss {{ max_mss }}
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{% endif %}
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COMMIT
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#### The nat table
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# This table enables Network Address Translation
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# (This is technically a type of packet mangling)
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#
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*nat
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:PREROUTING ACCEPT [0:0]
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:POSTROUTING ACCEPT [0:0]
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# Allow traffic from the VPN network to the outside world, and replies
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-A POSTROUTING -s {{ vpn_network }}{% if wireguard_enabled %},{{ wireguard_vpn_network }}{% endif %} -m policy --pol none --dir out -j MASQUERADE
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COMMIT
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#### The filter table
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# The default ipfilter table
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#
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*filter
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# By default, drop packets that are destined for this server
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:INPUT DROP [0:0]
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# By default, drop packets that request to be forwarded by this server
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:FORWARD DROP [0:0]
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# By default, accept any packets originating from this server
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:OUTPUT ACCEPT [0:0]
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# Accept packets destined for localhost
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-A INPUT -i lo -j ACCEPT
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# Accept any packet from an open TCP connection
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-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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# Accept packets using the encapsulation protocol
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-A INPUT -p esp -j ACCEPT
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-A INPUT -p ah -j ACCEPT
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# rate limit ICMP traffic per source
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-A INPUT -p icmp --icmp-type echo-request -m hashlimit --hashlimit-upto 5/s --hashlimit-mode srcip --hashlimit-srcmask 32 --hashlimit-name icmp-echo-drop -j ACCEPT
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# Accept IPSEC traffic to ports 500 (IPSEC) and 4500 (MOBIKE aka IKE + NAT traversal)
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-A INPUT -p udp -m multiport --dports 500,4500{% if wireguard_enabled %},{{ wireguard_port}}{% endif %} -j ACCEPT
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# Allow new traffic to port 22 (SSH)
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-A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW -j ACCEPT
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# Allow any traffic from the VPN
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-A INPUT -p ipencap -m policy --dir in --pol ipsec --proto esp -j ACCEPT
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# TODO:
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# The IP of the resolver should be bound to a DUMMY interface.
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# DUMMY interfaces are the proper way to install IPs without assigning them any
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# particular virtual (tun,tap,...) or physical (ethernet) interface.
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# Accept DNS traffic to the local DNS resolver
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-A INPUT -d {{ local_service_ip }} -p udp --dport 53 -j ACCEPT
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# Drop traffic between VPN clients
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{% if BetweenClients_DROP %}
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{% set BetweenClientsPolicy = "DROP" %}
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{% endif %}
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-A FORWARD -s {{ vpn_network }}{% if wireguard_enabled %},{{ wireguard_vpn_network }}{% endif %} -d {{ vpn_network }}{% if wireguard_enabled %},{{ wireguard_vpn_network }}{% endif %} -j {{ BetweenClientsPolicy | default("ACCEPT") }}
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# Forward any packet that's part of an established connection
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-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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# Drop SMB/CIFS traffic that requests to be forwarded
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-A FORWARD -p tcp --dport 445 -j DROP
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# Drop NETBIOS trafic that requests to be forwarded
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-A FORWARD -p udp -m multiport --ports 137,138 -j DROP
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-A FORWARD -p tcp -m multiport --ports 137,139 -j DROP
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# Forward any IPSEC traffic from the VPN network
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-A FORWARD -m conntrack --ctstate NEW -s {{ vpn_network }} -m policy --pol ipsec --dir in -j ACCEPT
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# Forward any traffic from the WireGuard VPN network
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{% if wireguard_enabled %}
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-A FORWARD -m conntrack --ctstate NEW -s {{ wireguard_vpn_network }} -m policy --pol none --dir in -j ACCEPT
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{% endif %}
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COMMIT
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