127 lines
4.1 KiB
Django/Jinja
127 lines
4.1 KiB
Django/Jinja
#!/usr/sbin/nft -f
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{% set ifaces_fabric = interfaces | selectattr('name', 'match', '^lan') | map(attribute='name') %}
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flush ruleset
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table inet filter {
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include "/etc/nftables.d/interfaces.nft"
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include "/etc/nftables.d/networks.nft"
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include "/etc/nftables.d/sets.nft*"
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set link {
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type iface_index
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elements = { {{ ifaces_fabric | product(['2', '4']) | map('join', '.') | join(', ') }} }
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}
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chain input {
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type filter hook input priority 0; policy drop
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ct state vmap { established : accept, related : accept, invalid : drop } \
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comment "Accept established streams and drop invalid connections"
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iif lo accept \
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comment "Accept any localhost traffic"
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iif mgmt tcp dport ssh accept \
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comment "Accept SSH from management VRF"
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# allow SSH connections from firewall master’s IPs
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{% for iface in hostvars[master].interfaces %}
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{% for address in iface.ip_addresses | selectattr('family.value', '==', 4) %}
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tcp dport ssh {{ 'ip' if address.family.value == 4 else 'ip6' }} saddr {{ address.address | ipaddr('address') }} accept
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{% for nat_address in address.nat_outside %}
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tcp dport ssh ip saddr {{ nat_address.address | ipaddr('address') }} accept
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{% endfor %}
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{% endfor %}
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{% endfor %}
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iif @link tcp dport bgp ip6 saddr fe80::/10 accept \
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comment "Accept link-local BGP on fabric links"
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iif @link udp dport 3784 ip6 saddr fe80::/10 accept \
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comment "Accept link-local BFD on fabric links"
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iif @outside udp dport 51820 accept \
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comment "Accept WireGuard from outside"
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iif {{ iface_sync }} ip6 saddr fe80::/10 udp dport 3780 accept \
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comment "Accept connection tracking sync data"
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tcp dport auth reject with icmpx type port-unreachable \
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comment "Reject AUTH to make it fail fast"
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# ICMPv4
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ip protocol icmp icmp type {
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echo-request, echo-reply, destination-unreachable,
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parameter-problem, time-exceeded,
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} accept \
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comment "Accept ICMP"
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# ICMPv6
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ip6 nexthdr icmpv6 icmpv6 type {
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echo-request, echo-reply, destination-unreachable,
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packet-too-big, parameter-problem, time-exceeded,
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} accept \
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comment "Accept basic IPv6 functionality"
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ip6 nexthdr icmpv6 icmpv6 type {
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nd-neighbor-solicit, nd-neighbor-advert,
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nd-router-solicit, nd-router-advert,
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} ip6 hoplimit 255 accept \
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comment "Allow IPv6 neighbor discovery"
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}
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chain forward {
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type filter hook forward priority filter; policy drop
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ct state { established, related } accept \
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comment "Forward all established and related traffic"
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ct status dnat accept \
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comment "Forward DNAT traffic for servers and suchlike"
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# Forward IPv4 to/from VPN users in the same network.
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{% for vlan in vlans %}
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iif @inside ip saddr @{{ vlan.name }} ip daddr @{{ vlan.name }} accept
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{% endfor %}
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# Forward IPv6 to/from VPN users in the same network.
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{% for vlan in vlans %}
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iif @inside ip6 saddr @{{ vlan.name }}/6 ip6 daddr @{{ vlan.name }}/6 accept
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{% endfor %}
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include "/etc/nftables.d/forward.nft*"
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}
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chain output {
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type filter hook output priority 0; policy accept
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}
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}
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table ip nat {
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include "/etc/nftables.d/interfaces.nft"
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include "/etc/nftables.d/networks.nft"
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include "/etc/nftables.d/sets.nft*"
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include "/etc/nftables.d/netmap.nft*"
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# Ensure these maps exist even if empty.
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map netmap-in { type ipv4_addr : interval ipv4_addr; flags interval; }
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map netmap-out { type ipv4_addr : interval ipv4_addr; flags interval; }
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chain postrouting {
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type nat hook postrouting priority srcnat
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iif @inside oif @outside snat ip prefix to ip saddr map @netmap-out \
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comment "Static source NAT for 1:1 mapped addresses"
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include "/etc/nftables.d/nat.nft*"
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}
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chain prerouting {
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type nat hook prerouting priority dstnat
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dnat ip prefix to ip daddr map @netmap-in \
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comment "Static destination NAT for 1:1 mapped addresses"
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}
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}
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