10 files changed, 658 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
index bbe004c4..eb214426 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,3 +25,4 @@ src/*.egg-info
 pkg/osx/dist
 pkg/osx/build
 MANIFEST
+_trial_temp*
diff --git a/src/leap/email/__init__.py b/src/leap/email/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/leap/email/__init__.py
diff --git a/src/leap/email/smtp/README b/src/leap/email/smtp/README
new file mode 100644
index 00000000..a351dcec
--- /dev/null
+++ b/src/leap/email/smtp/README
@@ -0,0 +1,41 @@
+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]
+
+[1] http://pypi.python.org/pypi/Twisted/12.3.0
+
+
+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..f44aeb6f
--- /dev/null
+++ b/src/leap/email/smtp/smtprelay.py
@@ -0,0 +1,203 @@
+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()
+
+
+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" # this has to be changed 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)
+
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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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+q3iu
+=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..d00ebeb5
--- /dev/null
+++ b/src/leap/email/smtp/tests/__init__.py
@@ -0,0 +1,196 @@
+from leap.email.smtp.smtprelay import GPGWrapper
+import shutil
+from twisted.trial import unittest
+
+class OpenPGPTestCase(unittest.TestCase):
+
+    PREFIX     = "/var/tmp"
+    GNUPG_HOME = "%s/gnupg" % PREFIX
+    EMAIL      = 'leap@leap.se'
+
+    def setUp(self):
+        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):
+        shutil.rmtree(self.GNUPG_HOME)
+
+    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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+ER3zAmVf22Le9ciXbu24DN4mleOH+OmBx7X2PqJSYW9GAMTsRB081R6EWKH7romQ
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+GufRomjewZ8EMHDIgUsLcYo2UHZsfF7tcazgxMGmMvazp4r8vpgrvW/8fIN/6Adu
+tF+WjWDTvJLFJCe6O+BFJOWrssNrrra1zGtLC1s8s+Wfpe+bGPL5zpHeebGTwH1U
+22eqgJArlEKxrfarz7W5+uHZJHSjF/K9ZvunLGD0n9GOPMpji3UO3zeM8IYoWn7E
+/EWK1XbjnssNemeeTZ+sDh+qrD7BOi+vCX1IyBxbfqnQfJZvmcPWpruy1UsO+aIC
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+U0goPWoQ71PorP2XOUNp5ZLkBQp5etvtkksjVNMIhnHn8PGMuoxO39EUGlWj2B5l
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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..dc0055c6
--- /dev/null
+++ b/src/leap/email/smtp/tests/test_smtprelay.py
@@ -0,0 +1,76 @@
+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.internet.error import ConnectionDone
+from twisted.test import proto_helpers
+from twisted.internet import defer
+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)
+