Adapt smtp-relay to use leap.common.keymanager

* Add docstrings to smtp-relay classes.
* Setup test suite.
    * Add setuptools-trial as dependency for tests.
    * Move smtp-relay tests to default test directory.
* Add tests for smtp-relay.
    * Send of unencrypted mail depending on 'encrypted_only' param.
    * Malformed email address.
* Add a helper function for smtp-relay.
* Assert params for initializing SMTPFactory.
* Use mail.util.parseaddr to parse email address.
* Use email.message.Message to represent an email message in smtp-relay.
* Make requirements effective and fix leap.common version in setup.py.
* Add/remove dependencies in setup.py.
* Fix Soledad instantiation in tests.
* Fix sender address in smtp-relay.
* Fix some comments regarding twisted's SSL and SMTP.
* Remove authentication from smtp-relay when sending.

This closes #2446.

5 files changed, 621 insertions, 0 deletions

diff --git a/src/leap/mail/tests/smtp/185CA770.key b/src/leap/mail/tests/smtp/185CA770.key
new file mode 100644
index 0000000..587b416
--- /dev/null
+++ b/src/leap/mail/tests/smtp/185CA770.key
@@ -0,0 +1,79 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Version: GnuPG v1.4.10 (GNU/Linux)
+
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+-----END PGP PRIVATE KEY BLOCK-----
diff --git a/src/leap/mail/tests/smtp/185CA770.pub b/src/leap/mail/tests/smtp/185CA770.pub
new file mode 100644
index 0000000..38af19f
--- /dev/null
+++ b/src/leap/mail/tests/smtp/185CA770.pub
@@ -0,0 +1,52 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1.4.10 (GNU/Linux)
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+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/src/leap/mail/tests/smtp/__init__.py b/src/leap/mail/tests/smtp/__init__.py
new file mode 100644
index 0000000..113e047
--- /dev/null
+++ b/src/leap/mail/tests/smtp/__init__.py
@@ -0,0 +1,268 @@
+# -*- coding: utf-8 -*-
+# __init__.py
+# Copyright (C) 2013 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+"""
+Base classes and keys for SMTP relay tests.
+"""
+
+import os
+import shutil
+import tempfile
+from mock import Mock
+
+
+from twisted.trial import unittest
+
+
+from leap.soledad import Soledad
+from leap.soledad.crypto import SoledadCrypto
+from leap.common.keymanager import (
+    KeyManager,
+    openpgp,
+)
+
+
+from leap.common.testing.basetest import BaseLeapTest
+
+
+class TestCaseWithKeyManager(BaseLeapTest):
+
+    def setUp(self):
+        # mimic BaseLeapTest.setUpClass behaviour, because this is deprecated
+        # in Twisted: http://twistedmatrix.com/trac/ticket/1870
+        self.old_path = os.environ['PATH']
+        self.old_home = os.environ['HOME']
+        self.tempdir = tempfile.mkdtemp(prefix="leap_tests-")
+        self.home = self.tempdir
+        bin_tdir = os.path.join(
+            self.tempdir,
+            'bin')
+        os.environ["PATH"] = bin_tdir
+        os.environ["HOME"] = self.tempdir
+
+        # setup our own stuff
+        address = 'leap@leap.se'  # user's address in the form user@provider
+        uuid = 'leap@leap.se'
+        passphrase = '123'
+        secret_path = os.path.join(self.tempdir, 'secret.gpg')
+        local_db_path = os.path.join(self.tempdir, 'soledad.u1db')
+        server_url = 'http://provider/'
+        cert_file = ''
+
+        # mock key fetching and storing so Soledad doesn't fail when trying to
+        # reach the server.
+        Soledad._fetch_keys_from_shared_db = Mock(return_value=None)
+        Soledad._assert_keys_in_shared_db = Mock(return_value=None)
+
+        # instantiate soledad
+        self._soledad = Soledad(
+            uuid,
+            passphrase,
+            secret_path,
+            local_db_path,
+            server_url,
+            cert_file,
+        )
+
+        self._config = {
+            'host': 'http://provider/',
+            'port': 25,
+            'username': address,
+            'password': '<password>',
+            'encrypted_only': True
+        }
+
+        nickserver_url = ''  # the url of the nickserver
+        self._km = KeyManager(address, nickserver_url, self._soledad)
+
+        # insert test keys in key manager.
+        pgp = openpgp.OpenPGPScheme(self._soledad)
+        pgp.put_ascii_key(PRIVATE_KEY)
+        pgp.put_ascii_key(PRIVATE_KEY_2)
+
+    def tearDown(self):
+        # mimic LeapBaseTest.tearDownClass behaviour
+        os.environ["PATH"] = self.old_path
+        os.environ["HOME"] = self.old_home
+        # safety check
+        assert self.tempdir.startswith('/tmp/leap_tests-')
+        shutil.rmtree(self.tempdir)
+
+
+# Key material for testing
+KEY_FINGERPRINT = "E36E738D69173C13D709E44F2F455E2824D18DDF"
+PUBLIC_KEY = """
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1.4.10 (GNU/Linux)
+
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+=MuOY
+-----END PGP PUBLIC KEY BLOCK-----
+"""
+PRIVATE_KEY = """
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Version: GnuPG v1.4.10 (GNU/Linux)
+
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+=JTFu
+-----END PGP PRIVATE KEY BLOCK-----
+"""
diff --git a/src/leap/mail/tests/smtp/mail.txt b/src/leap/mail/tests/smtp/mail.txt
new file mode 100644
index 0000000..9542047
--- /dev/null
+++ b/src/leap/mail/tests/smtp/mail.txt
@@ -0,0 +1,10 @@
+HELO drebs@riseup.net
+MAIL FROM: drebs@riseup.net
+RCPT TO: drebs@riseup.net
+RCPT TO: drebs@leap.se
+DATA
+Subject: leap test
+
+Hello world!
+.
+QUIT
diff --git a/src/leap/mail/tests/smtp/test_smtprelay.py b/src/leap/mail/tests/smtp/test_smtprelay.py
new file mode 100644
index 0000000..6ef4e85
--- /dev/null
+++ b/src/leap/mail/tests/smtp/test_smtprelay.py
@@ -0,0 +1,212 @@
+# -*- coding: utf-8 -*-
+# test_smtprelay.py
+# Copyright (C) 2013 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+"""
+SMTP relay tests.
+"""
+
+
+import re
+
+
+from datetime import datetime
+from twisted.test import proto_helpers
+from twisted.mail.smtp import (
+    User,
+    SMTPBadRcpt,
+)
+from mock import Mock
+
+
+from leap.mail.smtp.smtprelay import (
+    SMTPFactory,
+    EncryptedMessage,
+)
+from leap.mail.tests.smtp import TestCaseWithKeyManager
+from leap.common.keymanager import openpgp
+
+
+# some regexps
+IP_REGEX = "(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}" + \
+    "([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])"
+HOSTNAME_REGEX = "(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*" + \
+    "([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])"
+IP_OR_HOST_REGEX = '(' + IP_REGEX + '|' + HOSTNAME_REGEX + ')'
+
+
+class TestSmtpRelay(TestCaseWithKeyManager):
+
+    EMAIL_DATA = ['HELO relay.leap.se',
+                  'MAIL FROM: <user@leap.se>',
+                  'RCPT TO: <leap@leap.se>',
+                  'DATA',
+                  'From: User <user@leap.se>',
+                  'To: Leap <leap@leap.se>',
+                  'Date: ' + datetime.now().strftime('%c'),
+                  'Subject: test message',
+                  '',
+                  'This is a secret message.',
+                  'Yours,',
+                  'A.',
+                  '',
+                  '.',
+                  'QUIT']
+
+    def assertMatch(self, string, pattern, msg=None):
+        if not re.match(pattern, string):
+            msg = self._formatMessage(msg, '"%s" does not match pattern "%s".'
+                                           % (string, pattern))
+            raise self.failureException(msg)
+
+    def test_openpgp_encrypt_decrypt(self):
+        "Test if openpgp can encrypt and decrypt."
+        text = "simple raw text"
+        pubkey = self._km.get_key(
+            'leap@leap.se', openpgp.OpenPGPKey, private=False)
+        encrypted = openpgp.encrypt_asym(text, pubkey)
+        self.assertNotEqual(text, encrypted, "failed encrypting text")
+        privkey = self._km.get_key(
+            'leap@leap.se', openpgp.OpenPGPKey, private=True)
+        decrypted = openpgp.decrypt_asym(encrypted, privkey)
+        self.assertEqual(text, decrypted, "failed decrypting text")
+
+    def test_relay_accepts_valid_email(self):
+        """
+        Test if SMTP server responds correctly for valid interaction.
+        """
+
+        SMTP_ANSWERS = ['220 ' + IP_OR_HOST_REGEX +
+                        ' NO UCE NO UBE NO RELAY PROBES',
+                        '250 ' + IP_OR_HOST_REGEX + ' Hello ' +
+                        IP_OR_HOST_REGEX + ', nice to meet you',
+                        '250 Sender address accepted',
+                        '250 Recipient address accepted',
+                        '354 Continue']
+        proto = SMTPFactory(
+            self._km, self._config).buildProtocol(('127.0.0.1', 0))
+        transport = proto_helpers.StringTransport()
+        proto.makeConnection(transport)
+        for i, line in enumerate(self.EMAIL_DATA):
+            proto.lineReceived(line + '\r\n')
+            self.assertMatch(transport.value(),
+                             '\r\n'.join(SMTP_ANSWERS[0:i + 1]))
+        proto.setTimeout(None)
+
+    def test_message_encrypt(self):
+        """
+        Test if message gets encrypted to destination email.
+        """
+        proto = SMTPFactory(
+            self._km, self._config).buildProtocol(('127.0.0.1', 0))
+        user = User('leap@leap.se', 'relay.leap.se', proto, 'leap@leap.se')
+        m = EncryptedMessage(user, self._km, self._config)
+        for line in self.EMAIL_DATA[4:12]:
+            m.lineReceived(line)
+        m.eomReceived()
+        privkey = self._km.get_key(
+            'leap@leap.se', openpgp.OpenPGPKey, private=True)
+        decrypted = openpgp.decrypt_asym(m._message.get_payload(), privkey)
+        self.assertEqual(
+            '\r\n'.join(self.EMAIL_DATA[9:12]) + '\r\n',
+            decrypted)
+
+    def test_missing_key_rejects_address(self):
+        """
+        Test if server rejects to send unencrypted when 'encrypted_only' is
+        True.
+        """
+        # remove key from key manager
+        pubkey = self._km.get_key('leap@leap.se', openpgp.OpenPGPKey)
+        pgp = openpgp.OpenPGPScheme(self._soledad)
+        pgp.delete_key(pubkey)
+        # mock the key fetching
+        self._km.fetch_keys_from_server = Mock(return_value=[])
+        # prepare the SMTP factory
+        proto = SMTPFactory(
+            self._km, self._config).buildProtocol(('127.0.0.1', 0))
+        transport = proto_helpers.StringTransport()
+        proto.makeConnection(transport)
+        proto.lineReceived(self.EMAIL_DATA[0] + '\r\n')
+        proto.lineReceived(self.EMAIL_DATA[1] + '\r\n')
+        proto.lineReceived(self.EMAIL_DATA[2] + '\r\n')
+        # ensure the address was rejected
+        lines = transport.value().rstrip().split('\n')
+        self.assertEqual(
+            '550 Cannot receive for specified address',
+            lines[-1])
+
+    def test_missing_key_accepts_address(self):
+        """
+        Test if server accepts to send unencrypted when 'encrypted_only' is
+        False.
+        """
+        # remove key from key manager
+        pubkey = self._km.get_key('leap@leap.se', openpgp.OpenPGPKey)
+        pgp = openpgp.OpenPGPScheme(self._soledad)
+        pgp.delete_key(pubkey)
+        # mock the key fetching
+        self._km.fetch_keys_from_server = Mock(return_value=[])
+        # change the configuration
+        self._config['encrypted_only'] = False
+        # prepare the SMTP factory
+        proto = SMTPFactory(
+            self._km, self._config).buildProtocol(('127.0.0.1', 0))
+        transport = proto_helpers.StringTransport()
+        proto.makeConnection(transport)
+        proto.lineReceived(self.EMAIL_DATA[0] + '\r\n')
+        proto.lineReceived(self.EMAIL_DATA[1] + '\r\n')
+        proto.lineReceived(self.EMAIL_DATA[2] + '\r\n')
+        # ensure the address was rejected
+        lines = transport.value().rstrip().split('\n')
+        self.assertEqual(
+            '250 Recipient address accepted',
+            lines[-1])
+
+    def test_malformed_address_rejects(self):
+        """
+        Test if server rejects to send to malformed addresses.
+        """
+        # mock the key fetching
+        self._km.fetch_keys_from_server = Mock(return_value=[])
+        # prepare the SMTP factory
+        for malformed in ['leap@']:
+            proto = SMTPFactory(
+                self._km, self._config).buildProtocol(('127.0.0.1', 0))
+            transport = proto_helpers.StringTransport()
+            proto.makeConnection(transport)
+            proto.lineReceived(self.EMAIL_DATA[0] + '\r\n')
+            proto.lineReceived(self.EMAIL_DATA[1] + '\r\n')
+            proto.lineReceived('RCPT TO: <%s>%s' % (malformed, '\r\n'))
+            # ensure the address was rejected
+            lines = transport.value().rstrip().split('\n')
+            self.assertEqual(
+                '550 Cannot receive for specified address',
+                lines[-1])
+
+    def test_prepare_header_adds_from(self):
+        """
+        Test if message headers are OK.
+        """
+        proto = SMTPFactory(
+            self._km, self._config).buildProtocol(('127.0.0.1', 0))
+        user = User('leap@leap.se', 'relay.leap.se', proto, 'leap@leap.se')
+        m = EncryptedMessage(user, self._km, self._config)
+        for line in self.EMAIL_DATA[4:12]:
+            m.lineReceived(line)
+        m.eomReceived()
+        self.assertEqual('<leap@leap.se>', m._message['From'])