Is it possible to write a firewall in python?

Question

I just want to know, Whether it is possible to write a firewall in python?

Answer 1

Yes, we can perform firewall in python.

Using nfqueue, we can able to perform firewalling duties and we have the code which interacts with linux iptables.

We can use a rule in iptables:

iptables -A INPUT -j NFQUEUE --queue-num 1

Then have a look at the following code:

import nfqueue

from dpkt import ip

q = None

def cb(dummy, payload):

    # make decision about if the packet should be allowed. in this case, drop everything:

    payload.set_verdict(nfqueue.NF_DROP)

q = nfqueue.queue()

q.open()

q.bind()

q.set_callback(cb)

q.create_queue(1)

q.try_run()

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