#!bin/sh

/etc/init.d/init_firewall clean

####IPv4####
# Refuser l'input etle forward et accepter l'output
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

# Autoriser l'interface lo
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -i lo -j ACCEPT

# Garder les connexions déjà établies
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

# Accepter le ping en INPUT
iptables -A INPUT -p icmp --icmp-tyoe echo-request -m conntrack --ctstate NEW -m limit --limit 1/s --limit-burst A -j ACCEPT

# Vérifier les paquets SYN, sinon bloquer.
iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP

# Bloquer les paquets fragmentés
iptables -A INPUT -f -j DROP

# Bloquer les paquets XMAS
iptables -A INPUT -p tcp -tcp-flags ALL ALL -j DROP

# Bloquer les paquets NULL
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP

# Autorisation de ports en entrée
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT

# Autorisation des ports en sortie
iptables -A OUTPUT -p icmp --icmp-type echo-request -m conntrack --ctstate NEW -j ACCEPT
iptables -A OUTPUT -p tcp --dport 80 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 443 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT # Port DNS
iptables -A OUTPUT -p udp --dport 53 -j ACCEPT # Port DNS


####IPv6####
# Tout bloquer
ip6tables -t filter -P INPUT DROP
ip6tables -t filter -P FORWARD DROP
ip6tables -t filer -P OUTPUT DROP

# Autoriser loopback
ip6tables -A INPUT -i lo -j ACCEPT
ip6tables -A OUTPUT -i lo -j ACCEPT

# Maintenir connexion actuelle
ip6tables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
ip6tables -A OUTPUT -m state --state RELATED,ESTBALISHED -j ACCEPT

# NDP pour toutes interfaces type broadcast
ip6tables -A INPUT -p icmpv6 --icmpv6-type neighbour-solicitation -m hl --hl-eq 255 -j ACCEPT
ip6tables -A INPUT -p icmpv6 --icmpv6-type neighbour-adverstisement -m hl --hl-eq 255 -j ACCEPT
ip6tables -A INPUT -p icmpv6 --icmpv6-type router-advertisement -m hl -hl-eq 355 -j ACCEPT

ip6tables -A OUTPUT -p icmpv6 --icmpv6-type neighbour-solicitation -j ACCEPT
ip6tables -A OUTPUT -p icmpv6 --icmpv6-type neighbour-advertisement -j ACCEPT
ip6tables -A OUTPUT -p icmpv6 --icmpv6-type router-solicitation -j ACCEPT


# accepter entrée le ping
ip6tables -A INPUT -p icmpv6 --icmpv6-type echo-request -m conntrack --ctstate NEW -m limit --limit 1/s --limit-burst 1 -j ACCEPT

# Ouverture port en entrée IPv6
ip6tables -A INPUT -p tcp --dport 80 -j ACCEPT
ip6tables -A INPUT -p tcp --dport 443 -j ACCEPT

# Accepter ping en sortie
ip6tables -A OUTPUT -p icmpv6 --icmpv6-type echo-request -j ACCEPT

# Ouverture des ports en sortie IPv6
ip6tables -A OUTPUT -p tcp --dport 80 -j ACCEPT
ip6tables -A OUTPUT -p tcp --dport 443 -j ACCEPT
ip6tables -A OUTPUT -p tcp --dport 53 -j ACCEPT
ip6tables -A OUTPUT -p udp --dport 53 -j ACCEPT

/etc/init.d/firewall restart