Ip-tables als Firewall auf Maschinenebene

Das Regelwerk kann auf einem CentOS6 oder CentOS7 Server via Script generiert werden.
Das Script ist wie folgt aus unserem hauseigenen "Repo" zu beziehen: wget --user=Shopbenutzer12 --password='9k2aS2s' -P /root/ https://www.estugo.de/files/scripts/iptablesscript

Script umbenennen und ausführbar machen

mv iptablesscript iptablesscript.sh && chmod +x iptablesscript.sh

Script ausführen

./iptablesscript.sh

fertig

folgendes Regelwerk verwenden wir momentan (Stand 18.11.2019)

# Generated by iptables-save v1.4.21 on Wed Oct 23 09:41:57 2019
*nat
:PREROUTING ACCEPT [2152:124701]
:INPUT ACCEPT [1842:104693]
:OUTPUT ACCEPT [5477:335938]
:POSTROUTING ACCEPT [5477:335938]
COMMIT
# Completed on Wed Oct 23 09:41:57 2019
# Generated by iptables-save v1.4.21 on Wed Oct 23 09:41:57 2019
*raw
:PREROUTING ACCEPT [129693:39002264]
:OUTPUT ACCEPT [122067:156550655]
COMMIT
# Completed on Wed Oct 23 09:41:57 2019
# Generated by iptables-save v1.4.21 on Wed Oct 23 09:41:57 2019
*mangle
:PREROUTING ACCEPT [129693:39002264]
:INPUT ACCEPT [129693:39002264]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [122067:156550655]
:POSTROUTING ACCEPT [122067:156550655]
COMMIT
# Completed on Wed Oct 23 09:41:57 2019
# Generated by iptables-save v1.4.21 on Wed Oct 23 09:41:57 2019
*filter
:INPUT DROP [120:6624]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [61788:68401442]
-A INPUT -p icmp -m icmp --icmp-type 8 -m comment --comment "Ping-Anfragen erlauben" -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -m comment --comment "bestehende Verbindungen" -j ACCEPT
-A INPUT -s 127.0.0.1/32 -m comment --comment "localhost" -j ACCEPT
-A INPUT -s 37.218.252.213/32 -m comment --comment "Eigene IP-Adresse" -j ACCEPT
-A INPUT -s 89.22.107.170/32 -p tcp -m tcp --dport 10050 -m comment --comment "Zabbix-Server" -j ACCEPT
-A INPUT -s 37.218.252.210/32 -p tcp -m tcp --dport 10050 -m comment --comment "Zabbix-Server" -j ACCEPT
-A INPUT -s 195.110.43.163/32 -p tcp -m tcp --dport 4949 -m comment --comment "Munin-Server" -j ACCEPT
-A INPUT -s 37.218.252.210/32 -p tcp -m tcp --dport 22 -m comment --comment "MGMT-SSH" -j ACCEPT
-A INPUT -s 37.218.252.71/32 -p tcp -m tcp --dport 22 -m comment --comment "MGMT-SSH" -j ACCEPT
-A INPUT -s 37.218.252.210/32 -p tcp -m multiport --dports 7080,7081 -m comment --comment "MGMT-Apache" -j ACCEPT
-A INPUT -s 37.218.252.210/32 -p tcp -m tcp --dport 8447 -m comment --comment "Plesk-Installer" -j ACCEPT
-A INPUT -p tcp -m multiport --dports 25,465,587,110,995,143,993 -m comment --comment "Mail-Services" -j ACCEPT
-A INPUT -p tcp -m multiport --dports 80,443,8443 -m comment --comment "Web-Services" -j ACCEPT
-A INPUT -p tcp -m multiport --dports 20,21,989,990,50000:50100 -m comment --comment "FTP-Services" -j ACCEPT
-A INPUT -p tcp -m tcp --dport 3306 -m comment --comment "MySQL extern" -j ACCEPT
COMMIT
# Completed on Wed Oct 23 09:41:57 2019

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