BigBlueButton hardening

Firewall

Script

• /usr/local/sbin/firewall

#!/bin/bash
iptables -F INPUT
case $1 in
start)
iptables -P INPUT DROP
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 1935 -j ACCEPT
iptables -A INPUT -p tcp --dport 7443 -j ACCEPT
iptables -A INPUT -p udp --dport 16384:32768 -j ACCEPT
iptables -A INPUT -j LOG --log-prefix " --ipt-in-- "
;;
stop)
iptables -P INPUT ACCEPT
;;
esac

Unit

• /etc/system/system/firewall.service

[Unit]
Description=firewall
After=network.target syslog.target

[Service]
RemainAfterExit=yes
ExecStart=/usr/local/sbin/firewall start
ExecStop=/usr/local/sbin/firewall stop
User=root

[Install]
WantedBy=multi-user.target