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import ssl
import unittest
import pkg_resources
from aiosmtpd.controller import Controller as BaseController
from aiosmtpd.handlers import Sink
from aiosmtpd.smtp import SMTP as SMTPProtocol
from aiosmtpd.testing.helpers import (
SUPPORTED_COMMANDS_TLS,
assert_auth_invalid,
)
from email.mime.text import MIMEText
from smtplib import SMTP
class Controller(BaseController):
def factory(self):
return SMTPProtocol(self.handler)
class ReceivingHandler:
def __init__(self):
self.box = []
async def handle_DATA(self, server, session, envelope):
self.box.append(envelope)
return '250 OK'
def get_tls_context():
tls_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
tls_context.load_cert_chain(
pkg_resources.resource_filename('aiosmtpd.tests.certs', 'server.crt'),
pkg_resources.resource_filename('aiosmtpd.tests.certs', 'server.key'))
return tls_context
class TLSRequiredController(Controller):
def factory(self):
return SMTPProtocol(
self.handler,
decode_data=True,
require_starttls=True,
tls_context=get_tls_context())
class TLSController(Controller):
def factory(self):
return SMTPProtocol(
self.handler,
decode_data=True,
require_starttls=False,
tls_context=get_tls_context())
class RequireTLSAuthDecodingController(Controller):
def factory(self):
return SMTPProtocol(
self.handler,
decode_data=True,
auth_require_tls=True,
tls_context=get_tls_context())
class HandshakeFailingHandler:
def handle_STARTTLS(self, server, session, envelope):
return False
class TestStartTLS(unittest.TestCase):
def test_starttls(self):
handler = ReceivingHandler()
controller = TLSController(handler)
controller.start()
self.addCleanup(controller.stop)
with SMTP(controller.hostname, controller.port) as client:
code, response = client.ehlo('example.com')
self.assertEqual(code, 250)
self.assertIn('starttls', client.esmtp_features)
code, response = client.starttls()
self.assertEqual(code, 220)
client.send_message(
MIMEText('hi'),
'sender@example.com',
'rcpt1@example.com')
self.assertEqual(len(handler.box), 1)
def test_failed_handshake(self):
controller = TLSController(HandshakeFailingHandler())
controller.start()
self.addCleanup(controller.stop)
with SMTP(controller.hostname, controller.port) as client:
client.ehlo('example.com')
code, response = client.starttls()
self.assertEqual(code, 220)
code, response = client.mail('sender@example.com')
self.assertEqual(code, 554)
code, response = client.rcpt('rcpt@example.com')
self.assertEqual(code, 554)
def test_disabled_tls(self):
controller = Controller(Sink)
controller.start()
self.addCleanup(controller.stop)
with SMTP(controller.hostname, controller.port) as client:
client.ehlo('example.com')
code, response = client.docmd('STARTTLS')
self.assertEqual(code, 454)
def test_tls_bad_syntax(self):
controller = TLSController(Sink)
controller.start()
self.addCleanup(controller.stop)
with SMTP(controller.hostname, controller.port) as client:
client.ehlo('example.com')
code, response = client.docmd('STARTTLS', 'TRUE')
self.assertEqual(code, 501)
def test_help_after_starttls(self):
controller = TLSController(Sink())
controller.start()
self.addCleanup(controller.stop)
with SMTP(controller.hostname, controller.port) as client:
# Don't get tricked by smtplib processing of the response.
code, response = client.docmd('HELP')
self.assertEqual(code, 250)
self.assertEqual(response, SUPPORTED_COMMANDS_TLS)
class TestTLSForgetsSessionData(unittest.TestCase):
def setUp(self):
controller = TLSController(Sink)
controller.start()
self.addCleanup(controller.stop)
self.address = (controller.hostname, controller.port)
def test_forget_ehlo(self):
with SMTP(*self.address) as client:
client.starttls()
code, response = client.mail('sender@example.com')
self.assertEqual(code, 503)
self.assertEqual(response, b'Error: send HELO first')
def test_forget_mail(self):
with SMTP(*self.address) as client:
client.ehlo('example.com')
client.mail('sender@example.com')
client.starttls()
client.ehlo('example.com')
code, response = client.rcpt('rcpt@example.com')
self.assertEqual(code, 503)
self.assertEqual(response, b'Error: need MAIL command')
def test_forget_rcpt(self):
with SMTP(*self.address) as client:
client.ehlo('example.com')
client.mail('sender@example.com')
client.rcpt('rcpt@example.com')
client.starttls()
client.ehlo('example.com')
client.mail('sender@example.com')
code, response = client.docmd('DATA')
self.assertEqual(code, 503)
self.assertEqual(response, b'Error: need RCPT command')
class TestRequireTLS(unittest.TestCase):
def setUp(self):
controller = TLSRequiredController(Sink)
controller.start()
self.addCleanup(controller.stop)
self.address = (controller.hostname, controller.port)
def test_hello_fails(self):
with SMTP(*self.address) as client:
code, response = client.helo('example.com')
self.assertEqual(code, 530)
def test_help_fails(self):
with SMTP(*self.address) as client:
code, response = client.docmd('HELP', 'HELO')
self.assertEqual(code, 530)
def test_ehlo(self):
with SMTP(*self.address) as client:
code, response = client.ehlo('example.com')
self.assertEqual(code, 250)
self.assertIn('starttls', client.esmtp_features)
def test_mail_fails(self):
with SMTP(*self.address) as client:
client.ehlo('example.com')
code, response = client.mail('sender@exapmle.com')
self.assertEqual(code, 530)
def test_rcpt_fails(self):
with SMTP(*self.address) as client:
client.ehlo('example.com')
code, response = client.rcpt('sender@exapmle.com')
self.assertEqual(code, 530)
def test_vrfy_fails(self):
with SMTP(*self.address) as client:
client.ehlo('example.com')
code, response = client.vrfy('sender@exapmle.com')
self.assertEqual(code, 530)
def test_data_fails(self):
with SMTP(*self.address) as client:
client.ehlo('example.com')
code, response = client.docmd('DATA')
self.assertEqual(code, 530)
class TestRequireTLSAUTH(unittest.TestCase):
def setUp(self):
controller = RequireTLSAuthDecodingController(Sink)
controller.start()
self.addCleanup(controller.stop)
self.address = (controller.hostname, controller.port)
def test_auth_notls(self):
with SMTP(*self.address) as client:
client.ehlo('example.com')
code, response = client.docmd("AUTH ")
self.assertEqual(code, 538)
self.assertEqual(response,
b"5.7.11 Encryption required for requested "
b"authentication mechanism")
def test_auth_tls(self):
with SMTP(*self.address) as client:
client.starttls()
client.ehlo('example.com')
code, response = client.docmd('AUTH PLAIN AHRlc3QAdGVzdA==')
assert_auth_invalid(self, code, response)
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