8 files changed, 726 insertions, 0 deletions

diff --git a/src/leap/mail/smtp/README.rst b/src/leap/mail/smtp/README.rst
new file mode 100644
index 0000000..2b2a118
--- /dev/null
+++ b/src/leap/mail/smtp/README.rst
@@ -0,0 +1,43 @@
+Leap SMTP Relay
+===============
+
+Outgoing mail workflow:
+
+    * LEAP client runs a thin SMTP proxy on the user's device, bound to
+      localhost.
+    * User's MUA is configured outgoing SMTP to localhost
+    * When SMTP proxy receives an email from MUA
+        * SMTP proxy queries Key Manager for the user's private key and public
+          keys of all recipients
+        * Message is signed by sender and encrypted to recipients.
+        * If recipient's key is missing, email goes out in cleartext (unless
+          user has configured option to send only encrypted email)
+        * Finally, message is relayed to provider's SMTP relay
+
+
+Dependencies
+------------
+
+Leap SMTP Relay depends on the following python libraries:
+
+  * Twisted 12.3.0 [1]
+  * zope.interface 4.0.3 [2]
+
+[1] http://pypi.python.org/pypi/Twisted/12.3.0
+[2] http://pypi.python.org/pypi/zope.interface/4.0.3
+
+
+How to run
+----------
+
+To launch the SMTP relay, run the following command:
+
+  twistd -y smtprelay.tac
+
+
+Running tests
+-------------
+
+Tests are run using Twisted's Trial API, like this:
+
+  trial leap.email.smtp.tests
diff --git a/src/leap/mail/smtp/__init__.py b/src/leap/mail/smtp/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/leap/mail/smtp/__init__.py
diff --git a/src/leap/mail/smtp/smtprelay.py b/src/leap/mail/smtp/smtprelay.py
new file mode 100644
index 0000000..6479873
--- /dev/null
+++ b/src/leap/mail/smtp/smtprelay.py
@@ -0,0 +1,246 @@
+"""
+LEAP SMTP encrypted relay.
+"""
+
+import re
+import gnupg
+from zope.interface import implements
+from StringIO import StringIO
+from twisted.mail import smtp
+from twisted.internet.protocol import ServerFactory
+from twisted.internet import reactor
+from twisted.internet import defer
+from twisted.application import internet, service
+from twisted.python import log
+from email.Header import Header
+from leap import soledad
+
+
+class SMTPInfoNotAvailable(Exception):
+    pass
+
+
+class SMTPFactory(ServerFactory):
+    """
+    Factory for an SMTP server with encrypted relaying capabilities.
+    """
+
+    def __init__(self, soledad, gpg=None):
+        self._soledad = soledad
+        self._gpg = gpg
+
+    def buildProtocol(self, addr):
+        "Return a protocol suitable for the job."
+        # TODO: use ESMTP here.
+        smtpProtocol = smtp.SMTP(SMTPDelivery(self._soledad, self._gpg))
+        smtpProtocol.factory = self
+        return smtpProtocol
+
+
+class SMTPDelivery(object):
+    """
+    Validate email addresses and handle message delivery.
+    """
+
+    implements(smtp.IMessageDelivery)
+
+    def __init__(self, soledad, gpg=None):
+        self._soledad = soledad
+        if gpg:
+            self._gpg = gpg
+        else:
+            self._gpg = GPGWrapper()
+
+    def receivedHeader(self, helo, origin, recipients):
+        myHostname, clientIP = helo
+        headerValue = "by %s from %s with ESMTP ; %s" % (
+            myHostname, clientIP, smtp.rfc822date())
+        # email.Header.Header used for automatic wrapping of long lines
+        return "Received: %s" % Header(headerValue)
+
+    def validateTo(self, user):
+        """Assert existence of and trust on recipient's GPG public key."""
+        # try to find recipient's public key
+        try:
+            # this will raise an exception if key is not found
+            trust = self._gpg.find_key(user.dest.addrstr)['trust']
+            # if key is not ultimatelly trusted, then the message will not
+            # be encrypted. So, we check for this below
+            #if trust != 'u':
+            #    raise smtp.SMTPBadRcpt(user)
+            log.msg("Accepting mail for %s..." % user.dest)
+            return lambda: EncryptedMessage(user, soledad=self._soledad,
+                                            gpg=self._gpg)
+        except LookupError:
+            # if key was not found, check config to see if will send anyway.
+            if self.encrypted_only:
+                raise smtp.SMTPBadRcpt(user)
+            # TODO: send signal to cli/gui that this user's key was not found?
+            log.msg("Warning: will send an unencrypted message (because "
+                    "encrypted_only' is set to False).")
+
+    def validateFrom(self, helo, originAddress):
+        # accept mail from anywhere. To reject an address, raise
+        # smtp.SMTPBadSender here.
+        return originAddress
+
+
+class EncryptedMessage():
+    """
+    Receive plaintext from client, encrypt it and send message to a
+    recipient.
+    """
+    implements(smtp.IMessage)
+
+    SMTP_HOSTNAME = "mail.leap.se"
+    SMTP_PORT = 25
+
+    def __init__(self, user, soledad,  gpg=None):
+        self.user = user
+        self._soledad = soledad
+        self.fetchConfig()
+        self.lines = []
+        if gpg:
+            self._gpg = gpg
+        else:
+            self._gpg = GPGWrapper()
+
+    def lineReceived(self, line):
+        """Store email DATA lines as they arrive."""
+        self.lines.append(line)
+
+    def eomReceived(self):
+        """Encrypt and send message."""
+        log.msg("Message data complete.")
+        self.lines.append('')  # add a trailing newline
+        self.parseMessage()
+        try:
+            self.encrypt()
+            return self.sendMessage()
+        except LookupError:
+            return None
+
+    def parseMessage(self):
+        """Separate message headers from body."""
+        sep = self.lines.index('')
+        self.headers = self.lines[:sep]
+        self.body = self.lines[sep + 1:]
+
+    def connectionLost(self):
+        log.msg("Connection lost unexpectedly!")
+        log.err()
+        # unexpected loss of connection; don't save
+        self.lines = []
+
+    def sendSuccess(self, r):
+        log.msg(r)
+
+    def sendError(self, e):
+        log.msg(e)
+        log.err()
+
+    def prepareHeader(self):
+        self.headers.insert(1, "From: %s" % self.user.orig.addrstr)
+        self.headers.insert(2, "To: %s" % self.user.dest.addrstr)
+        self.headers.append('')
+
+    def sendMessage(self):
+        self.prepareHeader()
+        msg = '\n'.join(self.headers + [self.cyphertext])
+        d = defer.Deferred()
+        factory = smtp.ESMTPSenderFactory(self.smtp_username,
+                                          self.smtp_password,
+                                          self.smtp_username,
+                                          self.user.dest.addrstr,
+                                          StringIO(msg),
+                                          d)
+        # the next call is TSL-powered!
+        reactor.connectTCP(self.SMTP_HOSTNAME, self.SMTP_PORT, factory)
+        d.addCallback(self.sendSuccess)
+        d.addErrback(self.sendError)
+        return d
+
+    def encrypt(self, always_trust=True):
+        # TODO: do not "always trust" here.
+        try:
+            fp = self._gpg.find_key(self.user.dest.addrstr)['fingerprint']
+            log.msg("Encrypting to %s" % fp)
+            self.cyphertext = str(
+                self._gpg.encrypt(
+                    '\n'.join(self.body), [fp], always_trust=always_trust))
+        except LookupError:
+            if self.encrypted_only:
+                raise
+            log.msg("Warning: sending unencrypted mail (because "
+                    "'encrypted_only' is set to False).")
+
+    # this will be replaced by some other mechanism of obtaining credentials
+    # for SMTP server.
+    def fetchConfig(self):
+        # TODO: Soledad/LEAP bootstrap should store the SMTP info on local db,
+        # so this relay can load it when it needs.
+        if not self._soledad:
+            # TODO: uncomment below exception when integration with Soledad is
+            # smooth.
+            #raise SMTPInfoNotAvailable()
+            # TODO: remove dummy settings below when soledad bootstrap is
+            # working.
+            self.smtp_host = ''
+            self.smtp_port = ''
+            self.smtp_username = ''
+            self.smtp_password = ''
+            self.encrypted_only = True
+        else:
+            self.smtp_config = self._soledad.get_doc('smtp_relay_config')
+            for confname in [ 
+                'smtp_host', 'smtp_port', 'smtp_username',
+                'smtp_password', 'encrypted_only',
+            ]:
+                setattr(self, confname, doc.content[confname])
+
+
+class GPGWrapper():
+    """
+    This is a temporary class for handling GPG requests, and should be
+    replaced by a more general class used throughout the project.
+    """
+
+    GNUPG_HOME = "~/.config/leap/gnupg"
+    GNUPG_BINARY = "/usr/bin/gpg"  # TODO: change this based on OS
+
+    def __init__(self, gpghome=GNUPG_HOME, gpgbinary=GNUPG_BINARY):
+        self.gpg = gnupg.GPG(gnupghome=gpghome, gpgbinary=gpgbinary)
+
+    def find_key(self, email):
+        """
+        Find user's key based on their email.
+        """
+        for key in self.gpg.list_keys():
+            for uid in key['uids']:
+                if re.search(email, uid):
+                    return key
+        raise LookupError("GnuPG public key for %s not found!" % email)
+
+    def encrypt(self, data, recipient, always_trust=True):
+        # TODO: do not 'always_trust'.
+        return self.gpg.encrypt(data, recipient, always_trust=always_trust)
+
+    def decrypt(self, data):
+        return self.gpg.decrypt(data)
+
+    def import_keys(self, data):
+        return self.gpg.import_keys(data)
+
+
+# service configuration
+port = 25
+user_email = 'user@leap.se' # TODO: replace for real mail from gui/cli
+
+# instantiate soledad for client app storage and sync
+s = soledad.Soledad(user_email)
+factory = SMTPFactory(s)
+
+# enable the use of this service with twistd
+application = service.Application("LEAP SMTP Relay")
+service = internet.TCPServer(port, factory)
+service.setServiceParent(application)
diff --git a/src/leap/mail/smtp/tests/185CA770.key b/src/leap/mail/smtp/tests/185CA770.key
new file mode 100644
index 0000000..587b416
--- /dev/null
+++ b/src/leap/mail/smtp/tests/185CA770.key
@@ -0,0 +1,79 @@
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diff --git a/src/leap/mail/smtp/tests/185CA770.pub b/src/leap/mail/smtp/tests/185CA770.pub
new file mode 100644
index 0000000..38af19f
--- /dev/null
+++ b/src/leap/mail/smtp/tests/185CA770.pub
@@ -0,0 +1,52 @@
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+Version: GnuPG v1.4.10 (GNU/Linux)
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+q3iu
+=RChS
+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/src/leap/mail/smtp/tests/__init__.py b/src/leap/mail/smtp/tests/__init__.py
new file mode 100644
index 0000000..d7b942a
--- /dev/null
+++ b/src/leap/mail/smtp/tests/__init__.py
@@ -0,0 +1,218 @@
+import os
+import shutil
+import tempfile
+
+from twisted.trial import unittest
+
+from leap.common.testing.basetest import BaseLeapTest
+from leap.mail.smtp.smtprelay import GPGWrapper
+
+
+class OpenPGPTestCase(unittest.TestCase, BaseLeapTest):
+
+    def setUp(self):
+        # mimic LeapBaseTest.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
+        self.gnupg_home = self.tempdir + '/gnupg'
+        os.mkdir(self.gnupg_home)
+        self.email = 'leap@leap.se'
+        self._gpg = GPGWrapper(gpghome=self.gnupg_home)
+
+        self.assertEqual(self._gpg.import_keys(PUBLIC_KEY).summary(),
+                         '1 imported', "error importing public key")
+        self.assertEqual(self._gpg.import_keys(PRIVATE_KEY).summary(),
+                         # note that gnupg does not return a successful import
+                         # for private keys. Bug?
+                         '0 imported', "error importing private key")
+
+    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)
+
+    def test_openpgp_encrypt_decrypt(self):
+        "Test if openpgp can encrypt and decrypt."
+        text = "simple raw text"
+        encrypted = str(self._gpg.encrypt(text, KEY_FINGERPRINT,
+                                          # TODO: handle always trust issue
+                                          always_trust=True))
+        self.assertNotEqual(text, encrypted, "failed encrypting text")
+        decrypted = str(self._gpg.decrypt(encrypted))
+        self.assertEqual(text, decrypted, "failed decrypting text")
+
+
+# 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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+RZXoH+FTg9UAW87eqU610npOkT6cRaBxaMK/mDtGNdc=
+=JTFu
+-----END PGP PRIVATE KEY BLOCK-----
+"""
diff --git a/src/leap/mail/smtp/tests/mail.txt b/src/leap/mail/smtp/tests/mail.txt
new file mode 100644
index 0000000..9542047
--- /dev/null
+++ b/src/leap/mail/smtp/tests/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/smtp/tests/test_smtprelay.py b/src/leap/mail/smtp/tests/test_smtprelay.py
new file mode 100644
index 0000000..eaa4d04
--- /dev/null
+++ b/src/leap/mail/smtp/tests/test_smtprelay.py
@@ -0,0 +1,78 @@
+from datetime import datetime
+import re
+from leap.email.smtp.smtprelay import (
+    SMTPFactory,
+    #SMTPDelivery, # an object
+    EncryptedMessage,
+)
+from leap.email.smtp import tests
+from twisted.test import proto_helpers
+from twisted.mail.smtp import User
+
+
+# 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(tests.OpenPGPTestCase):
+
+    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_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(None, self._gpg).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(None, self._gpg).buildProtocol(('127.0.0.1', 0))
+        user = User('leap@leap.se', 'relay.leap.se', proto, 'leap@leap.se')
+        m = EncryptedMessage(user, None, self._gpg)
+        for line in self.EMAIL_DATA[4:12]:
+            m.lineReceived(line)
+        m.parseMessage()
+        m.encrypt()
+        decrypted = str(self._gpg.decrypt(m.cyphertext))
+        self.assertEqual('\n'.join(self.EMAIL_DATA[9:12]), decrypted)