Remove size limits on 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 7f0b1e17e6bb68135d73ce48bc4d80c9a068de20..94c3835252fb84ac318374e92724a540c9dc2c20 100644 (file)
--- a/cookbooks/networking/templates/default/nftables.conf.erb
+++ b/cookbooks/networking/templates/default/nftables.conf.erb
@@ -1,9 +1,11 @@
 #!/usr/sbin/nft -f
 
+<%- unless @interfaces.empty? %>
 define external-interfaces = { <%= @interfaces.sort.uniq.join(", ") %> }
+<%- end %>
 
-define ip-private-addresses = { 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 ip6-private-addresses = { 2001:db8::/32, fc00::/7 }
+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 }
 
 table inet filter {
   set ip-osm-addresses {
@@ -23,11 +25,25 @@ table inet filter {
   set ip-blacklist {
     type ipv4_addr
     flags dynamic
+    size 0
   }
 
   set ip6-blacklist {
     type ipv6_addr
     flags dynamic
+    size 0
+  }
+
+  set ratelimit-icmp-echo-ip {
+    type ipv4_addr
+    flags dynamic
+    size 0
+  }
+
+  set ratelimit-icmp-echo-ip6 {
+    type ipv6_addr
+    flags dynamic
+    size 0
   }
 
 <%- node[:networking][:firewall][:sets].each do |set| %>
@@ -38,6 +54,7 @@ table inet filter {
     type ipv6_addr
 <%- end %>
     flags dynamic
+    size 0
   }
 
 <%- end %>
@@ -52,7 +69,11 @@ table inet filter {
   }
 
   chain incoming {
+<%- if node[:networking][:firewall][:whitelist].empty? %>
     ip saddr { $ip-private-addresses } jump log-and-drop
+<%- else %>
+    ip saddr { $ip-private-addresses } ip saddr != { <%= node[:networking][:firewall][:whitelist].sort.join(", ") %> } jump log-and-drop
+<%- end %>
     ip6 saddr { $ip6-private-addresses } jump log-and-drop
 
     ip saddr @ip-blacklist jump log-and-drop
@@ -61,13 +82,23 @@ table inet filter {
     ct state { established, related } accept
 
     icmp type { destination-unreachable } accept
-    icmpv6 type { nd-neighbor-solicit, nd-neighbor-advert, nd-router-solicit, nd-router-advert } accept
+    icmp type { echo-request } add @ratelimit-icmp-echo-ip { ip saddr limit rate 1/second } accept
+    icmp type { echo-request } drop
 
-    icmp type { echo-request } limit rate 1/second accept
-    icmpv6 type { echo-request } limit rate 1/second accept
+    icmpv6 type { nd-neighbor-solicit, nd-neighbor-advert, nd-router-solicit, nd-router-advert } accept
+    icmpv6 type { echo-request } add @ratelimit-icmp-echo-ip6 { ip6 saddr limit rate 1/second } accept
+    icmpv6 type { echo-request } drop
 
     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|syn|rst|psh|ack|urg) == 0x0 jump log-and-drop
+    tcp flags & (syn|rst) == syn|rst jump log-and-drop
+    tcp flags & (fin|rst) == fin|rst jump log-and-drop
+    tcp flags & (fin|syn) == fin|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| %>
     <%= rule %>
 <%- end %>
@@ -76,7 +107,11 @@ table inet filter {
   }
 
   chain outgoing {
+<%- if node[:networking][:firewall][:whitelist].empty? %>
     ip daddr { $ip-private-addresses } jump log-and-drop
+<%- else %>
+    ip daddr { $ip-private-addresses } ip daddr != { <%= node[:networking][:firewall][:whitelist].sort.join(", ") %> } jump log-and-drop
+<%- end %>
     ip6 daddr { $ip6-private-addresses } jump log-and-drop
 
 <%- node[:networking][:firewall][:outgoing].each do |rule| %>
@@ -89,7 +124,9 @@ table inet filter {
   chain input {
     type filter hook input priority filter;
 
-    iif { $external-interfaces } jump incoming
+<%- unless @interfaces.empty? %>
+    iifname { $external-interfaces } jump incoming
+<%- end %>
 
     accept
   }
@@ -97,8 +134,10 @@ table inet filter {
   chain forward {
     type filter hook forward priority filter;
 
-    iif { $external-interfaces } jump incoming
-    oif { $external-interfaces } jump outgoing
+<%- unless @interfaces.empty? %>
+    iifname { $external-interfaces } jump incoming
+    oifname { $external-interfaces } jump outgoing
+<%- end %>
 
     accept
   }
@@ -106,7 +145,9 @@ table inet filter {
   chain output {
     type filter hook output priority filter;
 
-    oif { $external-interfaces } jump outgoing
+<%- unless @interfaces.empty? %>
+    oifname { $external-interfaces } jump outgoing
+<%- end %>
 
     accept
   }
@@ -117,9 +158,9 @@ table ip nat {
   chain postrouting {
     type nat hook postrouting priority srcnat;
 
-<%- node.interfaces(:role => :external).each do |external| %>
-<%- node.interfaces(:role => :internal).each do |internal| %>
-    oif { < %= external[:interface] %> } ip saddr { <%= internal[:network] %>/<%= internal[:prefix] %> } snat <%= external[:address] %>
+<%- 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 %>
   }