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#!/usr/bin/env python
import ssl
from pathlib import Path
import importlib
from subprocess import run, PIPE
from aiosmtpd.controller import Controller
from aiosmtpd.smtp import SMTP
import subprocess
import argparse
def get_context():
key_path = Path('certs', 'key.pem')
cert_path = Path('certs', 'cert.pem')
if not cert_path.exists() and not key_path.exists():
subprocess.call(f'openssl req -x509 -newkey rsa:4096 -keyout {key_path.as_posix()} -out {cert_path.as_posix()} -days 365 -nodes -subj "/CN=localhost"', shell=True)
context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
context.load_cert_chain(cert_path.as_posix(), key_path.as_posix())
# Pass SSL context to aiosmtpd
class ControllerSSL(Controller):
def factory(self):
return SMTP(self.handler, ssl_context=get_context())
# Pass SSL context to aiosmtpd
class ControllerSTARTTLS(Controller):
def factory(self):
return SMTP(self.handler, require_starttls=False, tls_context=get_context())
class CustomSMTPHandler:
async def handle_DATA(self, server, session, envelope):
print(f'Receiving message from: {session.peer}')
print(f'Message addressed from: {envelope.mail_from}')
print(f'Message addressed to : {envelope.rcpt_tos}')
print(f'Message length : {len(envelope.content)}')
if email_forward in envelope.rcpt_tos:
p = run([binpath_forward, "-"], stdout=PIPE, input=envelope.content)
else:
p = run([binpath, "-"], stdout=PIPE, input=envelope.content)
print(p)
return '250 OK'
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Launch a fake SMTP server to push SPAMs to a MISP instance')
parser.add_argument("--path", default='./mail_to_misp.py', help="Path to the mail_to_misp.py script.")
parser.add_argument("--path_forward", default='./mail_to_misp.py', help="Path to the mail_to_misp.py script.")
parser.add_argument("--email_forward", default='mail2misp@example.com', help="Path to the mail_to_misp.py script.")
parser.add_argument("--host", default='127.0.0.1', help="IP to attach the SMTP server to.")
parser.add_argument("--port", default='2525', help="Port of the SMTP server")
parser.add_argument("--ssl", action='store_true', help="Pure SMTPs.")
args = parser.parse_args()
configmodule = Path(__file__).as_posix().replace('.py', '_config')
if Path(f'{configmodule}.py').exists():
config = importlib.import_module(configmodule)
binpath = config.binpath
binpath_forward = config.binpath_forward
email_forward = config.email_forward
smtp_addr = config.smtp_addr
smtp_port = config.smtp_port
smtps = config.ssl
else:
binpath = args.path
binpath_forward = args.path_forward
email_forward = args.email_forward
smtp_addr = args.host
smtp_port = args.port
smtps = args.ssl
print("Starting Fake-SMTP-to-MISP server")
handler = CustomSMTPHandler()
if smtps:
server = ControllerSSL(handler, hostname=smtp_addr, port=smtp_port)
else:
server = ControllerSTARTTLS(handler, hostname=smtp_addr, port=smtp_port)
server.start()
input("Server started. Press Return to quit.")
server.stop()