Ajout des configs du firewall jusqu'à l'étape 6

2025-04-17 14:56:53 +02:00
parent 8240fd27ab
commit ef975eb469
4 changed files with 252 additions and 1 deletions
--- a/sisr1/tp06-firewall/fw_part5.nft
+++ b/sisr1/tp06-firewall/fw_part5.nft
@@ -0,0 +1,106 @@
+define netif = enp0s3
+define lanif = enp0s8
+define dmzif = enp0s9
+
+define netip = 192.168.0.130
+define lanip = 172.16.0.254
+define dmzip = 172.17.0.254
+
+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{
+ 
+	#Chaines de filtrage
+ 
+	chain prerouting {
+                type filter hook prerouting priority filter; policy drop;
+			#Communication déjà établies
+		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;
+			#Communication déjà établies
+		ct state established,related accept
+			#SSH
+		tcp sport 22 accept
+			#Proxy lycée
+		tcp dport 8080 accept
+			#DNS
+		udp dport 53 accept
+			#HTTP/HTTPS
+		tcp dport {80,443} accept
+			#FTP
+		tcp dport {20,21} accept
+			#Pings
+		icmp type echo-request accept
+		icmp type echo-reply oif $lanif accept
+        }
+	chain postrouting {
+                type filter hook postrouting priority filter; policy drop;
+			#Communication déjà établies
+		ct state established,related accept
+			#SSH
+		tcp sport 22 accept
+			#Proxy lycée
+		tcp dport 8080 accept
+			#DNS
+		udp dport 53 accept
+			#HTTP/HTTPS 
+		tcp dport {80,443} accept
+			#FTP
+		tcp dport {20,21} accept
+            #Requêtes externe du serveur DNS
+        ip saddr $internal-dns-ip ip daddr $dns-forwarder-ip accept
+			#Pings
+		icmp type echo-request oif {$lanif, $dmzif} accept
+		icmp type echo-reply oif $lanif accept
+        }
+ 
+	#Chaines pour la NAT
+ 
+	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
+	}
+ 
+}