#!/usr/sbin/nft -f
-<%- unless @interfaces.empty? %>
+<% unless @interfaces.empty? -%>
define external-interfaces = { <%= @interfaces.sort.uniq.join(", ") %> }
-<%- end %>
-
-define ip-private-addresses = { 0.0.0.0, 10.0.0.0/8, 127.0.0.0/8, 169.254.0.0/16, 172.16.0.0/12, 192.0.2.0/24, 192.168.0.0/16, 224.0.0.0/4 }
-define ip6-private-addresses = { 2001:db8::/32, fc00::/7, ff00::/8 }
+<% end -%>
+# Exclude 169.254.169.0/24 from ip-private-addresses as is widely by cloud providers.
+define ip-private-addresses = { 0.0.0.0, 10.0.0.0/8, 127.0.0.0/8, 169.254.0.0-169.254.168.255, 169.254.170.0-169.254.255.255, 172.16.0.0/12, 192.0.2.0/24, 192.168.0.0/16 }
+define ip-multicast-addresses = { 224.0.0.0/4 }
+define ip6-private-addresses = { 2001:db8::/32, fc00::/7 }
+define ip6-multicast-addresses = { ff00::/8 }
table inet chef-filter {
set ip-osm-addresses {
type ipv4_addr
-<%- unless Array(@hosts["inet"]).empty? %>
- elements = { <%= Array(@hosts["inet"]).sort.join(", ") %> }
-<%- end %>
+<% unless Array(@hosts[:inet]).empty? -%>
+ elements = { <%= Array(@hosts[:inet]).sort.join(", ") %> }
+<% end -%>
}
set ip6-osm-addresses {
type ipv6_addr
-<%- unless Array(@hosts["inet"]).empty? %>
- elements = { <%= Array(@hosts["inet6"]).sort.join(", ") %> }
-<%- end %>
+<% unless Array(@hosts[:inet6]).empty? -%>
+ elements = { <%= Array(@hosts[:inet6]).sort.join(", ") %> }
+<% end -%>
}
set ip-blocklist {
type ipv4_addr
- flags dynamic
+ flags interval
}
set ip6-blocklist {
type ipv6_addr
- flags dynamic
+ flags interval
}
set ratelimit-icmp-echo-ip {
timeout 120s
}
-<%- node[:networking][:firewall][:sets].each do |set| %>
- set <%= set %> {
-<%- if set.end_with?("-ip") %>
- type ipv4_addr
-<%- elsif set.end_with?("-ip6") %>
- type ipv6_addr
-<%- end %>
- flags dynamic
-<%- unless set.start_with?("connlimit-") %>
- timeout 120s
-<%- end %>
+<% node[:networking][:firewall][:sets].each do |set| -%>
+ set <%= set[:name] %> {
+ type <%= set[:type] %>
+<% if set[:flags] -%>
+ flags <%= set[:flags].join(", ") %>
+<% end -%>
+<% if set[:timeout] -%>
+ timeout <%= set[:timeout] %>s
+<% end -%>
}
-<%- end %>
+<% end -%>
+
+<% node[:networking][:firewall][:helpers].each do |helper| -%>
+ ct helper <%= helper[:name] %> {
+ type "<%= helper[:helper] %>" protocol <%= helper[:protocol] %>
+ }
+
+<% end -%>
chain log-and-drop {
- limit rate 1/second log
+ limit rate 1/second log level notice
drop
}
chain log-and-reject {
- limit rate 1/second log
+ limit rate 1/second log level notice
reject
}
chain incoming {
-<%- if node[:networking][:firewall][:allowlist].empty? %>
- ip saddr { $ip-private-addresses } jump log-and-drop
-<%- else %>
- ip saddr { $ip-private-addresses } ip saddr != { <%= node[:networking][:firewall][:allowlist].sort.join(", ") %> } jump log-and-drop
-<%- end %>
- ip6 saddr { $ip6-private-addresses } jump log-and-drop
+<% if node[:networking][:firewall][:allowlist].empty? -%>
+ ip saddr { $ip-private-addresses, $ip-multicast-addresses } jump log-and-drop
+<% else -%>
+ ip saddr { $ip-private-addresses, $ip-multicast-addresses } ip saddr != { <%= node[:networking][:firewall][:allowlist].sort.join(", ") %> } jump log-and-drop
+<% end -%>
+ ip6 saddr { $ip6-private-addresses, $ip6-multicast-addresses } jump log-and-drop
ip saddr @ip-blocklist jump log-and-drop
ip6 saddr @ip6-blocklist jump log-and-drop
- ct state { established, related } accept
-
- icmp type { destination-unreachable } accept
icmp type { echo-request } update @ratelimit-icmp-echo-ip { ip saddr limit rate 1/second } accept
icmp type { echo-request } drop
icmpv6 type { echo-request } update @ratelimit-icmp-echo-ip6 { ip6 saddr limit rate 1/second } accept
icmpv6 type { echo-request } drop
+ ct state { established, related } accept
+
meta l4proto { icmp, icmpv6 } jump log-and-drop
tcp flags & (fin|syn|rst|psh|ack|urg) == fin|psh|urg jump log-and-drop
tcp flags & (fin|psh|ack) == fin|psh jump log-and-drop
tcp sport 0 tcp flags & (fin|syn|rst|ack) == syn jump log-and-drop
-<%- node[:networking][:firewall][:incoming].uniq.each do |rule| %>
+<% node[:networking][:firewall][:incoming].uniq.each do |rule| -%>
<%= rule %>
-<%- end %>
+<% end -%>
jump log-and-drop
}
chain outgoing {
-<%- if node[:networking][:firewall][:allowlist].empty? %>
+<% if node[:networking][:firewall][:allowlist].empty? -%>
ip daddr { $ip-private-addresses } jump log-and-drop
-<%- else %>
+<% else -%>
ip daddr { $ip-private-addresses } ip daddr != { <%= node[:networking][:firewall][:allowlist].sort.join(", ") %> } jump log-and-drop
-<%- end %>
+<% end -%>
ip6 daddr { $ip6-private-addresses } jump log-and-drop
-<%- node[:networking][:firewall][:outgoing].each do |rule| %>
+<% node[:networking][:firewall][:outgoing].each do |rule| -%>
<%= rule %>
-<%- end %>
+<% end -%>
accept
}
chain input {
type filter hook input priority filter;
-<%- unless @interfaces.empty? %>
+<% unless @interfaces.empty? -%>
iifname { $external-interfaces } jump incoming
-<%- end %>
+<% end -%>
accept
}
chain forward {
type filter hook forward priority filter;
-<%- unless @interfaces.empty? %>
+<% unless @interfaces.empty? -%>
iifname { $external-interfaces } jump incoming
oifname { $external-interfaces } jump outgoing
-<%- end %>
+<% end -%>
accept
}
chain output {
type filter hook output priority filter;
-<%- unless @interfaces.empty? %>
+<% unless @interfaces.empty? -%>
oifname { $external-interfaces } jump outgoing
-<%- end %>
+<% end -%>
accept
}
}
-<%- if node[:roles].include?("gateway") %>
+<% if node[:roles].include?("gateway") -%>
table ip chef-nat {
chain postrouting {
type nat hook postrouting priority srcnat;
-<%- node.interfaces(:role => :external, :family => :inet).each do |external| %>
-<%- node.interfaces(:role => :internal, :family => :inet).each do |internal| %>
- oifname { <%= external[:interface] %> } ip saddr { <%= internal[:network] %>/<%= internal[:prefix] %> } snat <%= external[:address] %>
-<%- end %>
-<%- end %>
+<% node.interfaces(:role => :external).each do |external| -%>
+<% node.ipaddresses(:role => :internal, :family => :inet).each do |internal| -%>
+ oifname { <%= external[:interface] %> } ip saddr { <%= internal.subnet %> } snat <%= external[:inet][:address] %>
+<% end -%>
+<% end -%>
}
}
-<%- end %>
+<% end -%>