Firewall

Zurück zu OPSI

vim /etc/sysconfig/iptables

<script>

• nat

PREROUTING ACCEPT [0:0]

INPUT ACCEPT [0:0]

OUTPUT ACCEPT [0:0]

POSTROUTING ACCEPT [0:0]

-A POSTROUTING -o enp3s0 -j MASQUERADE COMMIT

• filter

INPUT DROP [0:0]

FORWARD DROP [0:0]

OUTPUT ACCEPT [401:43511]

1. lo

-A INPUT -i lo -j ACCEPT

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT

1. INPUT VPN Regeln
   1. ssh

-A INPUT -p tcp -i nc-schule -m state --state NEW -m tcp --dport 22 -j ACCEPT

1. 1. OPSI-Frontend

-A INPUT -p tcp -i nc-schule -m state --state NEW -m tcp --dport 443 -j ACCEPT -A INPUT -p tcp -i nc-schule -m state --state NEW -m tcp --dport 4447 -j ACCEPT

1. INPUT enp2s0 (OPSI-Netzwerk)
   1. ssh

-A INPUT -p tcp -i enp2s0 -m state --state NEW -m tcp --dport 22 -j ACCEPT

1. 1. DHCP

-A INPUT -p udp -i enp2s0 -m state --state NEW -m udp --dport 67 -j ACCEPT

1. 1. xinet

-A INPUT -p udp -i enp2s0 -m state --state NEW -m udp --dport 69 -j ACCEPT

1. 1. DNS-Server

-A INPUT -p tcp -i enp2s0 -m state --state NEW -m tcp --dport 53 -j ACCEPT -A INPUT -p udp -i enp2s0 -m state --state NEW -m udp --dport 53 -j ACCEPT

1. 1. OPSI-Frontend

-A INPUT -p tcp -i enp2s0 -m state --state NEW -m tcp --dport 443 -j ACCEPT -A INPUT -p tcp -i enp2s0 -m state --state NEW -m tcp --dport 4447 -j ACCEPT

1. 1. Samba NT4 Style

-A INPUT -p tcp -i enp2s0 -m state --state NEW -m tcp --dport 135 -j ACCEPT -A INPUT -p tcp -i enp2s0 -m state --state NEW -m tcp --dport 139 -j ACCEPT -A INPUT -p tcp -i enp2s0 -m state --state NEW -m tcp --dport 445 -j ACCEPT -A INPUT -p udp -i enp2s0 -m state --state NEW -m udp --dport 137 -j ACCEPT -A INPUT -p udp -i enp2s0 -m state --state NEW -m udp --dport 138 -j ACCEPT

1. ICMP Zusätze

-A INPUT -j REJECT --reject-with icmp-host-prohibited

1. Forward

-A FORWARD -i enp2s0 -j ACCEPT -A FORWARD -o enp2s0 -m state --state RELATED,ESTABLISHED -j ACCEPT -A FORWARD -j REJECT --reject-with icmp-host-prohibited

COMMIT

</script>

https://wiki.samba.org/index.php/Samba_port_usage