firewall

Install

# cd /usr/local/src/
# yum install -y git python39
# git clone https://github.com/netkiller/firewall.git
# cd firewall
# bash install.sh

Demo

$ sudo /etc/init.d/firewall 
Usage: /etc/init.d/firewall {start|stop|status|restart}

$ sudo /etc/init.d/firewall start

$ sudo /etc/init.d/firewall status
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
   44  6163 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED
	0     0 ACCEPT     icmp --  *      *       0.0.0.0/0            0.0.0.0/0           
	0     0 ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           
	0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:22 state NEW
	0     0 ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            multiport dports 443,80 state NEW
	2  2884 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         
	0     0 REJECT     all  --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT 45 packets, 6893 bytes)
 pkts bytes target     prot opt in     out     source               destination         
	0     0 REJECT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0            multiport dports 20,21 reject-with icmp-port-unreachable

$ sudo /etc/init.d/firewall stop

Rule file

$ sudo cat /srv/firewall/libexec/www.py 
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from firewall import * 

######################################## 
# Web Application
######################################## 

www = Firewall()
www.flush()
www.policy(www.INPUT,www.ACCEPT)
www.policy(www.OUTPUT,www.ACCEPT)
www.policy(www.FORWARD,www.ACCEPT)
www.input().state(('RELATED','ESTABLISHED')).accept()
www.input().protocol('icmp').accept()
www.input().interface('-i','lo').accept()
www.input().protocol('tcp').dport('22').state('NEW').accept()
www.input().protocol('tcp').dport(('443','80')).state('NEW').accept()
www.output().protocol('tcp').dport(('20','21')).reject()

#www.input().protocol('tcp').inbound('eth0').dport('80').recent('HTTP',2,20).drop()
#www.input().protocol('tcp').inbound('eth0').dport('80').connlimit(30).drop()
#www.input().protocol('tcp').inbound('eth0').dport('80').recent('HTTP').accept()
# DDOS
#www.input().proto('tcp').dport("80").string('XXDD0S').drop()
www.input().reject('--reject-with icmp-host-prohibited')
www.forward().reject('--reject-with icmp-host-prohibited')

def start():
	www.start()
def stop():
	www.stop()
def restart():
	www.stop()
	www.start()
def show():
	www.show()
def status():
	www.status()
def main():
	show()
	return( 0 )

if __name__ == '__main__':
	main()

Testing API

#!/usr/bin/python3
from firewall import Firewall    
single = Firewall()
single.policy(single.INPUT,single.DROP)
single.policy(single.OUTPUT,single.ACCEPT)
single.policy(single.FORWARD,single.DROP)
single.input().protocol('icmp').drop()
single.input().protocol('tcp').dport(('3389','5900')).accept()
single.input().protocol('tcp').dport(('137','138','139','145')).accept()
single.show()
#single.run()
#single.list()

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