nouveau fichier : siotp/sisr1/TP7/scriptsnft/current_ruleset.nft

nouveau fichier : siotp/sisr1/TP7/scriptsnft/fw_part1.nft
	nouveau fichier : siotp/sisr1/TP7/scriptsnft/fw_part2.nft
	nouveau fichier : siotp/sisr1/TP7/scriptsnft/fw_part3.nft
	nouveau fichier : siotp/sisr1/TP7/scriptsnft/refresh_firewall.sh

siotp/sisr1/TP7/scriptsnft/current_ruleset.nft

@@ -0,0 +1,68 @@
+define netif = enp0s3
+define dmzif = enp0s8
+define lanif = enp0s9
+
+define firewall = 192.168.0.140
+define ipdmz = 172.16.0.254
+define iplan = 10.0.0.254
+
+table ip ipfilter{
+	chain prerouting {
+                type filter hook prerouting priority filter; policy drop;
+		icmp type echo-reply accept
+		ct state established, related accept
+		icmp type echo-request iif {$lanif} ip daddr 172.16.0.1-172.16.0.254 accept
+		icmp type echo-request iif {$lanif} ip daddr {$iplan} accept
+                tcp dport 20 accept
+                tcp dport 21 accept
+                tcp dport {80, 443} accept
+		tcp dport 22 accept
+		ip saddr 10.121.38.1 tcp dport {80, 443} accept
+        }
+	chain system_in {
+                type filter hook input priority filter; policy drop;
+		icmp type echo-reply accept
+		icmp type echo-request iif {$lanif} accept
+		ct state established, related accept
+                tcp dport 20 accept
+                tcp dport 21 accept
+                tcp dport {80, 443} accept
+                tcp dport 22 accept
+		ip saddr 10.121.38.1 tcp dport {80, 443} accept
+        }
+ 	chain routing {
+                type filter hook forward priority filter; policy drop;
+        	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;
+                ip daddr 10.121.38.7-10.121.38.8 accept
+                ip daddr 10.121.38.1 tcp dport 8080 accept
+		icmp type echo-reply oif {$lanif} accept
+		icmp type echo-request accept
+                tcp dport 20 accept
+		tcp sport 20 accept
+                tcp dport 21 accept
+		tcp sport 21 accept
+                tcp dport {80, 443} accept
+		tcp sport {80, 443} accept
+		tcp sport 22 accept
+        }
+	chain postrouting {
+                type filter hook postrouting priority filter; policy drop;
+		ip daddr 10.121.38.7-10.121.38.8 accept
+		ip daddr 10.121.38.1 tcp dport 8080 accept
+		icmp type echo-request ip saddr {$iplan, $ipdmz, $firewall} accept
+		icmp type echo-reply iif {$dmzif}  oif {$lanif} accept
+		icmp type echo-request iif {$lanif} oif {$dmzif} accept
+		icmp type echo-request ip saddr $iplan oif $lanif accept
+                tcp dport 20 accept
+                tcp sport 20 accept
+                tcp dport 21 accept
+                tcp sport 21 accept
+                tcp dport {80, 443} accept
+                tcp sport {80, 443} accept
+		tcp sport 22 accept
+        }
+}

siotp/sisr1/TP7/scriptsnft/fw_part1.nft

@@ -0,0 +1,18 @@
+define netif = enp0s3
+define dmzif = enp0s8
+define lanif = enp0s9
+
+
+table ip ipfilter {
+	chain routing {
+		type filter hook forward priority filter; policy accept;
+		icmp type echo-request iif { "$netif", "$dmzif" } drop
+		icmp type { echo-reply, echo-request } accept
+		drop
+	}
+
+	chain system_in {
+		type filter hook input priority filter; policy accept;
+		icmp type echo-request iif { "$netif", "$dmzif" } drop
+	}
+}

siotp/sisr1/TP7/scriptsnft/fw_part2.nft

@@ -0,0 +1,34 @@
+define netif = enp0s3
+define dmzif = enp0s8
+define lanif = enp0s9
+
+
+table ip ipfilter {
+
+	chain prerouting {
+		type filter hook prerouting priority filter; policy drop;
+		tcp dport 22 accept
+	}
+
+	chain routing {
+		type filter hook forward priority filter; policy drop;
+		icmp type echo-request iif { $netif, $dmzif } drop
+		icmp type { echo-reply, echo-request } accept
+	}
+
+	chain system_in {
+		type filter hook input priority filter; policy drop;
+		icmp type echo-request iif { $netif, $dmzif } drop
+		tcp dport 22 accept
+	}
+
+	chain system_out {
+		type filter hook output priority filter; policy drop;
+		tcp sport 22 accept
+	}
+
+	chain postrouting {
+		type filter hook postrouting priority filter; policy drop;
+		tcp sport 22 accept
+	}
+}

siotp/sisr1/TP7/scriptsnft/fw_part3.nft

@@ -0,0 +1,41 @@
+define netif = enp0s3
+define dmzif = enp0s8
+define lanif = enp0s9
+define netip = 192.168.0.140
+define dmzip = 172.16.0.254
+define lanip = 10.0.0.254
+
+table ip ipfilter{
+	chain prerouting {
+		type filter hook prerouting priority filter; policy drop;
+		icmp type echo-request iif $lanif ip daddr 172.16.0.1-172.16.0.254 accept
+		icmp type echo-request iif $lanif ip daddr $lanip accept
+		icmp type echo-reply accept
+		tcp dport 22 accept
+	}
+	chain system_in {
+		type filter hook input priority filter; policy drop;
+		icmp type echo-request iif $lanif accept
+		icmp type echo-reply accept
+		tcp dport 22 accept
+	}
+	chain routing {
+		type filter hook forward priority filter; policy drop;
+		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;
+		icmp type echo-request accept
+		icmp type echo-reply oif $lanif accept
+		tcp sport 22 accept
+	}
+	chain postrouting {
+		type filter hook postrouting priority filter; policy drop;
+		icmp type echo-request ip saddr {$lanip , $dmzip , $netip } accept
+		icmp type echo-request iif $lanif oif $dmzif accept
+		icmp type echo-reply iif $dmzif oif $lanif accept
+		icmp type echo-reply ip saddr $lanip oif $lanif accept
+		tcp sport 22 accept
+	}
+}

siotp/sisr1/TP7/scriptsnft/refresh_firewall.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# active le routage entre les interfaces réseau du firewall
+echo "1" > /proc/sys/net/ipv4/ip_forward
+#vide les règles actuelles du pare-feu
+nft flush ruleset
+#charge les règles du pare-feu présentes dans le fichier
+nft -f /root/scriptsnft/current_ruleset.nft