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-rw-r--r--src/leap/email/smtp/README43
-rw-r--r--src/leap/email/smtp/__init__.py0
-rw-r--r--src/leap/email/smtp/smtprelay.py207
-rw-r--r--src/leap/email/smtp/tests/185CA770.key79
-rw-r--r--src/leap/email/smtp/tests/185CA770.pub52
-rw-r--r--src/leap/email/smtp/tests/__init__.py215
-rw-r--r--src/leap/email/smtp/tests/mail.txt10
-rw-r--r--src/leap/email/smtp/tests/test_smtprelay.py75
8 files changed, 681 insertions, 0 deletions
diff --git a/src/leap/email/smtp/README b/src/leap/email/smtp/README
new file mode 100644
index 00000000..2b2a1180
--- /dev/null
+++ b/src/leap/email/smtp/README
@@ -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/email/smtp/__init__.py b/src/leap/email/smtp/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/leap/email/smtp/__init__.py
diff --git a/src/leap/email/smtp/smtprelay.py b/src/leap/email/smtp/smtprelay.py
new file mode 100644
index 00000000..fdb8eb91
--- /dev/null
+++ b/src/leap/email/smtp/smtprelay.py
@@ -0,0 +1,207 @@
+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
+
+
+class SMTPFactory(ServerFactory):
+ """
+ Factory for an SMTP server with encrypted relaying capabilities.
+ """
+
+ def __init__(self, gpg=None):
+ self._gpg = gpg
+
+ def buildProtocol(self, addr):
+ "Return a protocol suitable for the job."
+ # TODO: use ESMTP here.
+ smtpProtocol = smtp.SMTP(SMTPDelivery(self._gpg))
+ smtpProtocol.factory = self
+ return smtpProtocol
+
+
+class SMTPDelivery(object):
+ """
+ Validate email addresses and handle message delivery.
+ """
+
+ implements(smtp.IMessageDelivery)
+
+ def __init__(self, gpg=None):
+ 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, gpg=self._gpg)
+ except LookupError:
+ raise smtp.SMTPBadRcpt(user)
+
+ 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.riseup.net"
+ SMTP_PORT = 25
+
+ def __init__(self, user, gpg=None):
+ self.user = user
+ self.getSMTPInfo()
+ 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.
+ 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))
+
+ # this will be replaced by some other mechanism of obtaining credentials
+ # for SMTP server.
+ def getSMTPInfo(self):
+ #f = open('/media/smtp-info.txt', 'r')
+ #self.smtp_host = f.readline().rstrip()
+ #self.smtp_port = f.readline().rstrip()
+ #self.smtp_username = f.readline().rstrip()
+ #self.smtp_password = f.readline().rstrip()
+ #f.close()
+ self.smtp_host = ''
+ self.smtp_port = ''
+ self.smtp_username = ''
+ self.smtp_password = ''
+
+
+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
+factory = SMTPFactory()
+
+# these 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/email/smtp/tests/185CA770.key b/src/leap/email/smtp/tests/185CA770.key
new file mode 100644
index 00000000..587b4164
--- /dev/null
+++ b/src/leap/email/smtp/tests/185CA770.key
@@ -0,0 +1,79 @@
+-----BEGIN PGP PRIVATE KEY BLOCK-----
+Version: GnuPG v1.4.10 (GNU/Linux)
+
+lQIVBFCJNL4BEADFsI1TCD4yq7ZqL7VhdVviTuX6JUps8/mVEhRVOZhojLcTYaqQ
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diff --git a/src/leap/email/smtp/tests/185CA770.pub b/src/leap/email/smtp/tests/185CA770.pub
new file mode 100644
index 00000000..38af19f8
--- /dev/null
+++ b/src/leap/email/smtp/tests/185CA770.pub
@@ -0,0 +1,52 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1.4.10 (GNU/Linux)
+
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+=RChS
+-----END PGP PUBLIC KEY BLOCK-----
diff --git a/src/leap/email/smtp/tests/__init__.py b/src/leap/email/smtp/tests/__init__.py
new file mode 100644
index 00000000..022968e1
--- /dev/null
+++ b/src/leap/email/smtp/tests/__init__.py
@@ -0,0 +1,215 @@
+import os
+import shutil
+import tempfile
+from leap.email.smtp.smtprelay import GPGWrapper
+from twisted.trial import unittest
+from leap.testing.basetest import BaseLeapTest
+
+
+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):
+ 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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+tF+WjWDTvJLFJCe6O+BFJOWrssNrrra1zGtLC1s8s+Wfpe+bGPL5zpHeebGTwH1U
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+RZXoH+FTg9UAW87eqU610npOkT6cRaBxaMK/mDtGNdc=
+=JTFu
+-----END PGP PRIVATE KEY BLOCK-----
+"""
diff --git a/src/leap/email/smtp/tests/mail.txt b/src/leap/email/smtp/tests/mail.txt
new file mode 100644
index 00000000..95420470
--- /dev/null
+++ b/src/leap/email/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/email/smtp/tests/test_smtprelay.py b/src/leap/email/smtp/tests/test_smtprelay.py
new file mode 100644
index 00000000..1c549eb3
--- /dev/null
+++ b/src/leap/email/smtp/tests/test_smtprelay.py
@@ -0,0 +1,75 @@
+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(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):
+ proto = SMTPFactory(self._gpg).buildProtocol(('127.0.0.1', 0))
+ user = User('leap@leap.se', 'relay.leap.se', proto, 'leap@leap.se')
+ m = EncryptedMessage(user, 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)