IPtables configuration
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First, i'm sorry for my english, not my first language.
I was wondering about IPtables. I read a lot of articles and posts about it, and thought i understood it at least a bit.
I spent hours trying every combinations of rules... And yet, i'm starting to think that only the established rules allow me to go on internet. when i delete those rules, nothing is allowed...
What did i do wrong ?
Thanks in advance !
#!/bin/bash
#iptables-restore < /etc/iptables.test.rules
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP
## On drop les scans XMAS et NULL.
iptables -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
iptables -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
# Dropper silencieusement tous les paquets broadcastés.
iptables -A INPUT -m pkttype --pkt-type broadcast -j DROP
# Droping all invalid packets
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A FORWARD -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
# Autorise les connexions déjà établies et localhost
iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
#iptables -A OUTPUT -o lo -j ACCEPT
# Autorise uniquement les processus de l'utilisateur tor à établir des
connexions
#iptables -A OUTPUT -m owner --uid-owner tor -j ACCEPT
#TOR
#iptables -A INPUT -p tcp -m tcp --dport 9050 -j ACCEPT
iptables -A OUTPUT -p tcp -m tcp --dport 9050 -j ACCEPT
# ICMP (Ping)
iptables -A INPUT -p icmp -j DROP
iptables -A OUTPUT -p icmp -j DROP
# SSH
iptables -A INPUT -p tcp --dport 666 -j DROP
iptables -A OUTPUT -p tcp --dport 666 -j DROP
# DNS
iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT
iptables -A OUTPUT -p udp --dport 53 -j ACCEPT
#iptables -A INPUT -p tcp --dport 53 -j ACCEPT
#iptables -A INPUT -p udp --dport 53 -j ACCEPT
# HTTP
iptables -A OUTPUT -p tcp --dport 80 -j ACCEPT
#iptables -A INPUT -p tcp --dport 80 -j ACCEPT
#HTTPS
iptables -A OUTPUT -p tcp --dport 443 -j ACCEPT
#iptables -A INPUT -p tcp --dport 443 -j ACCEPT
# FTP
#iptables -A OUTPUT -p tcp --dport 20:21 -j DROP
#iptables -A INPUT -p tcp --dport 20:21 -j DROP
# Mail SMTP
#iptables -A INPUT -p tcp --dport 25 -j DROP
iptables -A OUTPUT -p tcp --dport 25 -j ACCEPT
#iptables -A INPUT -p tcp --dport 587 -j DROP
#iptables -A OUTPUT -p tcp --dport 587 -j DROP
#Transmission
iptables -A INPUT -m state --state ESTABLISHED -p udp --dport 51413 -j
ACCEPT
iptables -A OUTPUT -p udp --sport 51413 -j ACCEPT
# Mail POP3
#iptables -A INPUT -p tcp --dport 110 -j DROP
#iptables -A OUTPUT -p tcp --dport 110 -j DROP
# Mail IMAP
#iptables -A INPUT -p tcp --dport 143 -j DROP
#iptables -A OUTPUT -p tcp --dport 143 -j DROP
# NTP (horloge du serveur)
iptables -A OUTPUT -p udp --dport 123 -j ACCEPT
# On log les paquets en entrée.
iptables -A INPUT -j LOG
# On log les paquets en sortie.
iptables -A OUTPUT -j LOG
# On log les paquets forward.
iptables -A FORWARD -j LOG
exit 0
security iptables firewall
asked 3 mins ago
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0
First, i'm sorry for my english, not my first language.
I was wondering about IPtables. I read a lot of articles and posts about it, and thought i understood it at least a bit.
I spent hours trying every combinations of rules... And yet, i'm starting to think that only the established rules allow me to go on internet. when i delete those rules, nothing is allowed...
What did i do wrong ?
Thanks in advance !
#!/bin/bash
#iptables-restore < /etc/iptables.test.rules
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP
## On drop les scans XMAS et NULL.
iptables -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
iptables -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
# Dropper silencieusement tous les paquets broadcastés.
iptables -A INPUT -m pkttype --pkt-type broadcast -j DROP
# Droping all invalid packets
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A FORWARD -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
# Autorise les connexions déjà établies et localhost
iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
#iptables -A OUTPUT -o lo -j ACCEPT
# Autorise uniquement les processus de l'utilisateur tor à établir des
connexions
#iptables -A OUTPUT -m owner --uid-owner tor -j ACCEPT
#TOR
#iptables -A INPUT -p tcp -m tcp --dport 9050 -j ACCEPT
iptables -A OUTPUT -p tcp -m tcp --dport 9050 -j ACCEPT
# ICMP (Ping)
iptables -A INPUT -p icmp -j DROP
iptables -A OUTPUT -p icmp -j DROP
# SSH
iptables -A INPUT -p tcp --dport 666 -j DROP
iptables -A OUTPUT -p tcp --dport 666 -j DROP
# DNS
iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT
iptables -A OUTPUT -p udp --dport 53 -j ACCEPT
#iptables -A INPUT -p tcp --dport 53 -j ACCEPT
#iptables -A INPUT -p udp --dport 53 -j ACCEPT
# HTTP
iptables -A OUTPUT -p tcp --dport 80 -j ACCEPT
#iptables -A INPUT -p tcp --dport 80 -j ACCEPT
#HTTPS
iptables -A OUTPUT -p tcp --dport 443 -j ACCEPT
#iptables -A INPUT -p tcp --dport 443 -j ACCEPT
# FTP
#iptables -A OUTPUT -p tcp --dport 20:21 -j DROP
#iptables -A INPUT -p tcp --dport 20:21 -j DROP
# Mail SMTP
#iptables -A INPUT -p tcp --dport 25 -j DROP
iptables -A OUTPUT -p tcp --dport 25 -j ACCEPT
#iptables -A INPUT -p tcp --dport 587 -j DROP
#iptables -A OUTPUT -p tcp --dport 587 -j DROP
#Transmission
iptables -A INPUT -m state --state ESTABLISHED -p udp --dport 51413 -j
ACCEPT
iptables -A OUTPUT -p udp --sport 51413 -j ACCEPT
# Mail POP3
#iptables -A INPUT -p tcp --dport 110 -j DROP
#iptables -A OUTPUT -p tcp --dport 110 -j DROP
# Mail IMAP
#iptables -A INPUT -p tcp --dport 143 -j DROP
#iptables -A OUTPUT -p tcp --dport 143 -j DROP
# NTP (horloge du serveur)
iptables -A OUTPUT -p udp --dport 123 -j ACCEPT
# On log les paquets en entrée.
iptables -A INPUT -j LOG
# On log les paquets en sortie.
iptables -A OUTPUT -j LOG
# On log les paquets forward.
iptables -A FORWARD -j LOG
exit 0
security iptables firewall
asked 3 mins ago
redravenredraven
1
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redraven is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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First, i'm sorry for my english, not my first language.
I was wondering about IPtables. I read a lot of articles and posts about it, and thought i understood it at least a bit.
I spent hours trying every combinations of rules... And yet, i'm starting to think that only the established rules allow me to go on internet. when i delete those rules, nothing is allowed...
What did i do wrong ?
Thanks in advance !
#!/bin/bash
#iptables-restore < /etc/iptables.test.rules
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP
## On drop les scans XMAS et NULL.
iptables -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
iptables -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
# Dropper silencieusement tous les paquets broadcastés.
iptables -A INPUT -m pkttype --pkt-type broadcast -j DROP
# Droping all invalid packets
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A FORWARD -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
# Autorise les connexions déjà établies et localhost
iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
#iptables -A OUTPUT -o lo -j ACCEPT
# Autorise uniquement les processus de l'utilisateur tor à établir des
connexions
#iptables -A OUTPUT -m owner --uid-owner tor -j ACCEPT
#TOR
#iptables -A INPUT -p tcp -m tcp --dport 9050 -j ACCEPT
iptables -A OUTPUT -p tcp -m tcp --dport 9050 -j ACCEPT
# ICMP (Ping)
iptables -A INPUT -p icmp -j DROP
iptables -A OUTPUT -p icmp -j DROP
# SSH
iptables -A INPUT -p tcp --dport 666 -j DROP
iptables -A OUTPUT -p tcp --dport 666 -j DROP
# DNS
iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT
iptables -A OUTPUT -p udp --dport 53 -j ACCEPT
#iptables -A INPUT -p tcp --dport 53 -j ACCEPT
#iptables -A INPUT -p udp --dport 53 -j ACCEPT
# HTTP
iptables -A OUTPUT -p tcp --dport 80 -j ACCEPT
#iptables -A INPUT -p tcp --dport 80 -j ACCEPT
#HTTPS
iptables -A OUTPUT -p tcp --dport 443 -j ACCEPT
#iptables -A INPUT -p tcp --dport 443 -j ACCEPT
# FTP
#iptables -A OUTPUT -p tcp --dport 20:21 -j DROP
#iptables -A INPUT -p tcp --dport 20:21 -j DROP
# Mail SMTP
#iptables -A INPUT -p tcp --dport 25 -j DROP
iptables -A OUTPUT -p tcp --dport 25 -j ACCEPT
#iptables -A INPUT -p tcp --dport 587 -j DROP
#iptables -A OUTPUT -p tcp --dport 587 -j DROP
#Transmission
iptables -A INPUT -m state --state ESTABLISHED -p udp --dport 51413 -j
ACCEPT
iptables -A OUTPUT -p udp --sport 51413 -j ACCEPT
# Mail POP3
#iptables -A INPUT -p tcp --dport 110 -j DROP
#iptables -A OUTPUT -p tcp --dport 110 -j DROP
# Mail IMAP
#iptables -A INPUT -p tcp --dport 143 -j DROP
#iptables -A OUTPUT -p tcp --dport 143 -j DROP
# NTP (horloge du serveur)
iptables -A OUTPUT -p udp --dport 123 -j ACCEPT
# On log les paquets en entrée.
iptables -A INPUT -j LOG
# On log les paquets en sortie.
iptables -A OUTPUT -j LOG
# On log les paquets forward.
iptables -A FORWARD -j LOG
exit 0
security iptables firewall
asked 3 mins ago
redravenredraven
1
New contributor
redraven is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
First, i'm sorry for my english, not my first language.
I was wondering about IPtables. I read a lot of articles and posts about it, and thought i understood it at least a bit.
I spent hours trying every combinations of rules... And yet, i'm starting to think that only the established rules allow me to go on internet. when i delete those rules, nothing is allowed...
What did i do wrong ?
Thanks in advance !
#!/bin/bash
#iptables-restore < /etc/iptables.test.rules
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP
## On drop les scans XMAS et NULL.
iptables -A INPUT -p tcp --tcp-flags FIN,URG,PSH FIN,URG,PSH -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
iptables -A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
# Dropper silencieusement tous les paquets broadcastés.
iptables -A INPUT -m pkttype --pkt-type broadcast -j DROP
# Droping all invalid packets
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A FORWARD -m state --state INVALID -j DROP
iptables -A OUTPUT -m state --state INVALID -j DROP
# Autorise les connexions déjà établies et localhost
iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
#iptables -A OUTPUT -o lo -j ACCEPT
# Autorise uniquement les processus de l'utilisateur tor à établir des
connexions
#iptables -A OUTPUT -m owner --uid-owner tor -j ACCEPT
#TOR
#iptables -A INPUT -p tcp -m tcp --dport 9050 -j ACCEPT
iptables -A OUTPUT -p tcp -m tcp --dport 9050 -j ACCEPT
# ICMP (Ping)
iptables -A INPUT -p icmp -j DROP
iptables -A OUTPUT -p icmp -j DROP
# SSH
iptables -A INPUT -p tcp --dport 666 -j DROP
iptables -A OUTPUT -p tcp --dport 666 -j DROP
# DNS
iptables -A OUTPUT -p tcp --dport 53 -j ACCEPT
iptables -A OUTPUT -p udp --dport 53 -j ACCEPT
#iptables -A INPUT -p tcp --dport 53 -j ACCEPT
#iptables -A INPUT -p udp --dport 53 -j ACCEPT
# HTTP
iptables -A OUTPUT -p tcp --dport 80 -j ACCEPT
#iptables -A INPUT -p tcp --dport 80 -j ACCEPT
#HTTPS
iptables -A OUTPUT -p tcp --dport 443 -j ACCEPT
#iptables -A INPUT -p tcp --dport 443 -j ACCEPT
# FTP
#iptables -A OUTPUT -p tcp --dport 20:21 -j DROP
#iptables -A INPUT -p tcp --dport 20:21 -j DROP
# Mail SMTP
#iptables -A INPUT -p tcp --dport 25 -j DROP
iptables -A OUTPUT -p tcp --dport 25 -j ACCEPT
#iptables -A INPUT -p tcp --dport 587 -j DROP
#iptables -A OUTPUT -p tcp --dport 587 -j DROP
#Transmission
iptables -A INPUT -m state --state ESTABLISHED -p udp --dport 51413 -j
ACCEPT
iptables -A OUTPUT -p udp --sport 51413 -j ACCEPT
# Mail POP3
#iptables -A INPUT -p tcp --dport 110 -j DROP
#iptables -A OUTPUT -p tcp --dport 110 -j DROP
# Mail IMAP
#iptables -A INPUT -p tcp --dport 143 -j DROP
#iptables -A OUTPUT -p tcp --dport 143 -j DROP
# NTP (horloge du serveur)
iptables -A OUTPUT -p udp --dport 123 -j ACCEPT
# On log les paquets en entrée.
iptables -A INPUT -j LOG
# On log les paquets en sortie.
iptables -A OUTPUT -j LOG
# On log les paquets forward.
iptables -A FORWARD -j LOG
exit 0
security iptables firewall
security iptables firewall
asked 3 mins ago
redravenredraven
1
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redraven is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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asked 3 mins ago
redravenredraven
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redraven is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
redravenredraven
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asked 3 mins ago
redravenredraven
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asked 3 mins ago
redravenredraven
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redraven is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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redraven is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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