Firewall

Zurück zu OPSI

vim /etc/sysconfig/iptables

*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]
# lo
-A INPUT -i lo -j ACCEPT


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

# INPUT VPN Regeln
## ssh 
-A INPUT -p tcp -i nc-schule -m state --state NEW -m tcp --dport 22 -j ACCEPT
## 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

# INPUT enp2s0 (OPSI-Netzwerk)
## ssh
-A INPUT -p tcp -i enp2s0  -m state --state NEW -m tcp --dport 22 -j ACCEPT

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

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

## 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
## 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
## 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

# ICMP Zusätze
-A INPUT -j REJECT --reject-with icmp-host-prohibited

# 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

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