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iptables
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#!/bin/sh | |
# Réinitialise les règles | |
iptables -t filter -F | |
iptables -t filter -X | |
# Bloque tout le trafic | |
iptables -t filter -P INPUT DROP | |
iptables -t filter -P FORWARD DROP | |
iptables -t filter -P OUTPUT DROP | |
# Autorise les connexions déjà établies et localhost | |
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT | |
iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT | |
iptables -t filter -A INPUT -i lo -j ACCEPT | |
iptables -t filter -A OUTPUT -o lo -j ACCEPT | |
# ICMP (Ping) | |
iptables -t filter -A INPUT -p icmp -j ACCEPT | |
iptables -t filter -A OUTPUT -p icmp -j ACCEPT | |
# SSH | |
iptables -t filter -A INPUT -p tcp --dport 22 -j ACCEPT | |
iptables -t filter -A OUTPUT -p tcp --dport 22 -j ACCEPT | |
# DNS | |
iptables -t filter -A OUTPUT -p tcp --dport 53 -j ACCEPT | |
iptables -t filter -A OUTPUT -p udp --dport 53 -j ACCEPT | |
iptables -t filter -A INPUT -p tcp --dport 53 -j ACCEPT | |
iptables -t filter -A INPUT -p udp --dport 53 -j ACCEPT | |
# HTTP | |
iptables -t filter -A OUTPUT -p tcp --dport 80 -j ACCEPT | |
iptables -t filter -A INPUT -p tcp --dport 80 -j ACCEPT | |
iptables -t filter -A OUTPUT -p tcp --dport 443 -j ACCEPT | |
iptables -t filter -A INPUT -p tcp --dport 443 -j ACCEPT | |
#HTTPS | |
iptables -t filter -A OUTPUT -p tcp --dport 443 -j ACCEPT | |
iptables -t filter -A INPUT -p tcp --dport 443 -j ACCEPT | |
# FTP | |
iptables -t filter -A OUTPUT -p tcp --dport 20:21 -j ACCEPT | |
iptables -t filter -A INPUT -p tcp --dport 20:21 -j ACCEPT | |
# Mail SMTP | |
iptables -t filter -A INPUT -p tcp --dport 25 -j ACCEPT | |
iptables -t filter -A OUTPUT -p tcp --dport 25 -j ACCEPT | |
# Mail POP3 | |
iptables -t filter -A INPUT -p tcp --dport 110 -j ACCEPT | |
iptables -t filter -A OUTPUT -p tcp --dport 110 -j ACCEPT | |
# Mail IMAP | |
iptables -t filter -A INPUT -p tcp --dport 143 -j ACCEPT | |
iptables -t filter -A OUTPUT -p tcp --dport 143 -j ACCEPT | |
# NTP (horloge du serveur) | |
sudo iptables -t filter -A OUTPUT -p udp --dport 123 -j ACCEPT | |
iptables -A FORWARD -p tcp --syn -m limit --limit 1/second -j ACCEPT |
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