tp06_firewall

sisr1/tp06_firewall/current_ruleset.nft

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+define netif = enp0s3
+define lanif = enp0s8
+define dmzif = enp0s9
+
+define netip = 192.168.0.160
+define dmzip = 172.17.0.254
+define lanip = 172.16.0.254
+
+define lan-ntw = 172.16.0.1-172.16.0.254
+define dmz-ntw = 172.17.0.1-172.17.0.254
+
+define internal-dns-ip = 172.16.0.2
+define dns-forwarder-ip = 10.121.38.7
+
+table ip ipfilter{
+	chain prerouting {
+                type filter hook prerouting priority filter; policy drop;
+				ct state established,related accept
+					#SSH
+		tcp dport 22 accept
+					#Requêtes HTTP/HTTPS depuis LAN
+		tcp dport {80,443} iif $lanif accept
+					#Requêtes externe du serveur DNS
+		ip saddr $internal-dns-ip ip daddr $dns-forwarder-ip accept
+					#Pings
+		icmp type echo-request iif $lanif accept
+		icmp type echo-reply iif {$lanif, $dmzif} accept
+        }
+
+	chain system_in {
+                type filter hook input priority filter; policy drop;
+			#Communication déjà établies
+		ct state established,related accept
+			#SSH
+		tcp dport 22 accept
+			#Pings
+		icmp type echo-request iif $lanif accept
+		icmp type echo-reply accept
+        }
+
+ 	chain routing {
+                type filter hook forward priority filter; policy drop;
+			#Communication déjà établies
+		ct state established,related accept
+			#Requêtes HTTP/HTTPS depuis LAN
+		tcp dport {80,443} iif $lanif accept
+					#Requêtes externe du serveur DNS
+		ip saddr $internal-dns-ip ip daddr $dns-forwarder-ip accept
+					#Pings
+		icmp type echo-request iif $lanif oif $dmzif accept
+		icmp type echo-reply iif $dmzif oif $lanif accept
+        }
+
+ 	chain system_out {
+                type filter hook output priority filter; policy drop;
+				ct state established,related accept
+		tcp dport 8080 accept		#Proxy du lycee
+		tcp sport 22 accept 		#SSH
+		tcp dport {20,21} accept	#FTP
+		udp dport 53 accept			#DNS
+		tcp dport {80,443} accept	#HTTP,HTTPS
+		icmp type echo-request accept
+		icmp type echo-request oif $lanif accept
+        }
+
+	chain postrouting {
+                type filter hook postrouting priority filter; policy drop;
+				ct state established,related accept
+		tcp dport 8080 accept		#Proxy du lycee
+		tcp sport 22 accept 		#SSH
+		tcp dport {20,21} accept	#FTP
+		udp dport 53 accept			#DNS
+		tcp dport {80, 443} accept	#HTTP,HTTPS
+		icmp type echo-request oif {$lanif, $dmzif} accept
+		icmp type echo-reply oif $lanif accept
+					#Requêtes externe du serveur DNS
+		ip saddr $internal-dns-ip ip daddr $dns-forwarder-ip accept
+        }
+		
+	chain nat_prerouting {
+				type nat hook prerouting priority filter; policy accept
+	}
+
+	chain nat_postrouting {
+		type nat hook postrouting priority filter; policy accept;
+				#Masquage des IP de la LAN sortant sur Internet
+			ip saddr $lan-ntw oif $netif snat $netip
+	}
+}

sisr1/tp06_firewall/test_firewall.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+ipfirewall=192.168.0.160
+dir=/root/firewall
+ruleset=current_ruleset.nft
+
+scp $ruleset root@$ipfirewall:$dir/$ruleset
+scp current_ruleset.nft root@$ipfirewall:/root/firewall/current_ruleset.nft
+ssh root@$ipfirewall "bash $dir//refresh_firewall.sh"