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exemples de script iptables

Fierce Fly on May 14, 2021

more /etc/init.d/MonFirewall

#!/bin/bash
echo Setting firewall rules...
#
# config de base
#

# Vider les tables actuelles
iptables -t filter -F
iptables -t filter -X
echo - Vidage : [OK]

# Autoriser SSH
iptables -t filter -A INPUT -p tcp --dport 22 -j ACCEPT
echo - Autoriser SSH : [OK]

# Ne pas casser les connexions établies
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
echo - Ne pas casser les connexions établies : [OK]

# Interdire toute connexion entrante
iptables -t filter -P INPUT DROP
iptables -t filter -P FORWARD DROP
echo - Interdire toute connexion entrante : [OK]

# Interdire toute connexion sortante
iptables -t filter -P OUTPUT DROP
echo - Interdire toute connexion sortante : [OK]

# Autoriser les requetes DNS, FTP, HTTP, NTP etc. SORTANTES
iptables -t filter -A OUTPUT -p tcp --dport 20 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 21 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 80 -j ACCEPT
iptables -t filter -A OUTPUT -p udp --dport 53 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 53 -j ACCEPT
iptables -t filter -A OUTPUT -p udp --dport 123 -j ACCEPT
echo - Autoriser les requêtes DNS, FTP, HTTP, NTP : [OK]

# Autoriser loopback
iptables -t filter -A INPUT -i lo -j ACCEPT
iptables -t filter -A OUTPUT -o lo -j ACCEPT
echo - Autoriser loopback : [OK]

# Autoriser ping
iptables -t filter -A INPUT -p icmp -j ACCEPT
iptables -t filter -A OUTPUT -p icmp -j ACCEPT
echo - Autoriser ping : [OK]

# Gestion des connexions ENTRANTES autorisées
#
# iptables -t filter -A INPUT -p  --dport -j ACCEPT

# Autoriser HTTP, HTTPS
iptables -t filter -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 443 -j ACCEPT
echo - Autoriser serveur Apache : [OK]

# Autoriser FTP
modprobe ip_conntrack
modprobe ip_conntrack_ftp
iptables -t filter -A INPUT -p tcp --dport 20 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 21 -j ACCEPT
iptables -t filter -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
echo - Autoriser serveur FTP : [OK]

# Autoriser Mail
iptables -t filter -A INPUT -p tcp --dport 25 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 110 -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 143 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 25 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 110 -j ACCEPT
iptables -t filter -A OUTPUT -p tcp --dport 143 -j ACCEPT
echo - Autoriser serveur Mail : [OK]

# Limiter le Syn-Flood à 1 seconde
iptables -A FORWARD -p tcp --syn -m limit --limit 1/second -j ACCEPT
iptables -A FORWARD -p udp -m limit --limit 1/second -j ACCEPT
echo - Limiter le Syn-Flood : [OK]

# IP à blacklister
# iptables -A INPUT -s ADRESSE_IP -j DROP
echo - Mise à jour des IP blacklistées : [OK]

# Bloquer le Spoofing
iptables -N SPOOFED
iptables -A SPOOFED -s 127.0.0.0/8 -j DROP
iptables -A SPOOFED -s 169.254.0.0/12 -j DROP
iptables -A SPOOFED -s 172.16.0.0/12 -j DROP
iptables -A SPOOFED -s 192.168.0.0/16 -j DROP
iptables -A SPOOFED -s 10.0.0.0/8 -j DROP
echo - Bloquer le Spoofing : [OK]

echo Firewall mis a jour avec succès !

Source: community.jaguar-network.com

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"exemples de script iptables" Code Answer's