Generalise configuration of firewall sets

[chef.git] / cookbooks / networking / templates / default / nftables.conf.erb

diff --git a/cookbooks/networking/templates/default/nftables.conf.erb b/cookbooks/networking/templates/default/nftables.conf.erb
index d98237d6e4649532b78655a8e8de69afed0a8feb..74d104fadae5cf9e38f7f698bd148c8f3d9175c3 100644 (file)
--- a/cookbooks/networking/templates/default/nftables.conf.erb
+++ b/cookbooks/networking/templates/default/nftables.conf.erb
@@ -1,35 +1,37 @@
 #!/usr/sbin/nft -f
 
 #!/usr/sbin/nft -f
 

-<%- unless @interfaces.empty? %>
+<% unless @interfaces.empty? -%>

 define external-interfaces = { <%= @interfaces.sort.uniq.join(", ") %> }
 define external-interfaces = { <%= @interfaces.sort.uniq.join(", ") %> }

-<%- end %>
+<% 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 }
+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 }
+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
 
 table inet chef-filter {
   set ip-osm-addresses {
     type ipv4_addr

-<%- unless Array(@hosts["inet"]).empty? %>
+<% unless Array(@hosts["inet"]).empty? -%>

     elements = { <%= Array(@hosts["inet"]).sort.join(", ") %> }
     elements = { <%= Array(@hosts["inet"]).sort.join(", ") %> }

-<%- end %>
+<% end -%>

   }
 
   set ip6-osm-addresses {
     type ipv6_addr
   }
 
   set ip6-osm-addresses {
     type ipv6_addr

-<%- unless Array(@hosts["inet"]).empty? %>
+<% unless Array(@hosts["inet"]).empty? -%>

     elements = { <%= Array(@hosts["inet6"]).sort.join(", ") %> }
     elements = { <%= Array(@hosts["inet6"]).sort.join(", ") %> }

-<%- end %>
+<% end -%>

   }
 
   set ip-blocklist {
     type ipv4_addr
   }
 
   set ip-blocklist {
     type ipv4_addr

-    flags dynamic
+    flags interval

   }
 
   set ip6-blocklist {
     type ipv6_addr
   }
 
   set ip6-blocklist {
     type ipv6_addr

-    flags dynamic
+    flags interval

   }
 
   set ratelimit-icmp-echo-ip {
   }
 
   set ratelimit-icmp-echo-ip {


@@ -44,20 +46,25 @@ table inet chef-filter {
     timeout 120s
   }
 
     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
     drop
   chain log-and-drop {
     limit rate 1/second log
     drop


@@ -69,19 +76,16 @@ table inet chef-filter {
   }
 
   chain incoming {
   }
 
   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
 
 
     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
 
     icmp type { echo-request } update @ratelimit-icmp-echo-ip { ip saddr limit rate 1/second } accept
     icmp type { echo-request } drop
 


@@ -89,6 +93,8 @@ table inet chef-filter {
     icmpv6 type { echo-request } update @ratelimit-icmp-echo-ip6 { ip6 saddr limit rate 1/second } accept
     icmpv6 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
     meta l4proto { icmp, icmpv6 } jump log-and-drop
 
     tcp flags & (fin|syn|rst|psh|ack|urg) == fin|psh|urg jump log-and-drop


@@ -99,24 +105,24 @@ table inet chef-filter {
     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
 
     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 %>
     <%= rule %>

-<%- end %>
+<% end -%>

 
     jump log-and-drop
   }
 
   chain outgoing {
 
     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
     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
     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
 
     ip6 daddr { $ip6-private-addresses } jump log-and-drop
 

-<%- node[:networking][:firewall][:outgoing].each do |rule| %>
+<% node[:networking][:firewall][:outgoing].each do |rule| -%>

     <%= rule %>
     <%= rule %>

-<%- end %>
+<% end -%>

 
     accept
   }
 
     accept
   }


@@ -124,9 +130,9 @@ table inet chef-filter {
   chain input {
     type filter hook input priority filter;
 
   chain input {
     type filter hook input priority filter;
 

-<%- unless @interfaces.empty? %>
+<% unless @interfaces.empty? -%>

     iifname { $external-interfaces } jump incoming
     iifname { $external-interfaces } jump incoming

-<%- end %>
+<% end -%>

 
     accept
   }
 
     accept
   }


@@ -134,10 +140,10 @@ table inet chef-filter {
   chain forward {
     type filter hook forward priority filter;
 
   chain forward {
     type filter hook forward priority filter;
 

-<%- unless @interfaces.empty? %>
+<% unless @interfaces.empty? -%>

     iifname { $external-interfaces } jump incoming
     oifname { $external-interfaces } jump outgoing
     iifname { $external-interfaces } jump incoming
     oifname { $external-interfaces } jump outgoing

-<%- end %>
+<% end -%>

 
     accept
   }
 
     accept
   }


@@ -145,24 +151,24 @@ table inet chef-filter {
   chain output {
     type filter hook output priority filter;
 
   chain output {
     type filter hook output priority filter;
 

-<%- unless @interfaces.empty? %>
+<% unless @interfaces.empty? -%>

     oifname { $external-interfaces } jump outgoing
     oifname { $external-interfaces } jump outgoing

-<%- end %>
+<% end -%>

 
     accept
   }
 }
 
     accept
   }
 }

-<%- if node[:roles].include?("gateway") %>
+<% if node[:roles].include?("gateway") -%>

 
 table ip chef-nat {
   chain postrouting {
     type nat hook postrouting priority srcnat;
 
 
 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| %>
+<% 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] %>
     oifname { <%= external[:interface] %> } ip saddr { <%= internal[:network] %>/<%= internal[:prefix] %> } snat <%= external[:address] %>

-<%- end %>
-<%- end %>
+<% end -%>
+<% end -%>

   }
 }
   }
 }

-<%- end %>
+<% end -%>