Block unspecified and multicast addresses on the outside

[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 923437f773394a4f15ec45e6e69ca212dd09a72b..f32339e9bf9d598d97e06e2f5e436e90dfa91bb8 100644 (file)
--- a/cookbooks/networking/templates/default/nftables.conf.erb
+++ b/cookbooks/networking/templates/default/nftables.conf.erb
@@ -2,15 +2,24 @@
 
 define external-interfaces = { <%= @interfaces.sort.uniq.join(", ") %> }
 
-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 }
 
-define ip-osm-addresses = { <%= Array(@hosts["inet"]).sort.join(", ") %> }
-define ip6-osm-addresses = { <%= Array(@hosts["inet6"]).sort.join(", ") %> }
+table inet filter {
+  set ip-osm-addresses {
+    type ipv4_addr
+<%- unless Array(@hosts["inet"]).empty? %>
+    elements = { <%= Array(@hosts["inet"]).sort.join(", ") %> }
+<%- end %>
+  }
 
-flush ruleset
+  set ip6-osm-addresses {
+    type ipv6_addr
+<%- unless Array(@hosts["inet"]).empty? %>
+    elements = { <%= Array(@hosts["inet6"]).sort.join(", ") %> }
+<%- end %>
+  }
 
-table inet filter {
   set ip-blacklist {
     type ipv4_addr
     flags dynamic
@@ -21,6 +30,16 @@ table inet filter {
     flags dynamic
   }
 
+  set limit-icmp-echo-ip {
+    type ipv4_addr
+    flags dynamic
+  }
+
+  set limit-icmp-echo-ip6 {
+    type ipv6_addr
+    flags dynamic
+  }
+
 <%- node[:networking][:firewall][:sets].each do |set| %>
   set <%= set %> {
 <%- if set.end_with?("-ip") %>
@@ -52,13 +71,23 @@ 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 @limit-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 @limit-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,psh,urg / fin,syn,rst,psh,ack,urg jump log-and-drop
+    tcp flags ! fin,syn,rst,psh,ack,urg 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 / fin,psh,ack jump log-and-drop
+    tcp sport 0 tcp flags syn / fin,syn,rst,ack jump log-and-drop
+
 <%- node[:networking][:firewall][:incoming].uniq.each do |rule| %>
     <%= rule %>
 <%- end %>