Implement TLS wrapper mode.

4 files changed, 105 insertions, 10 deletions

diff --git a/src/leap/mail/smtp/smtprelay.py b/src/leap/mail/smtp/smtprelay.py
index d9bbbf9..fca66c0 100644
--- a/src/leap/mail/smtp/smtprelay.py
+++ b/src/leap/mail/smtp/smtprelay.py
@@ -17,6 +17,20 @@
 
 """
 LEAP SMTP encrypted relay.
+
+The following classes comprise the SMTP relay service:
+
+    * SMTPFactory - A twisted.internet.protocol.ServerFactory that provides
+      the SMTPDelivery protocol.
+    * SMTPDelivery - A twisted.mail.smtp.IMessageDelivery implementation. It
+      knows how to validate sender and receiver of messages and it generates
+      an EncryptedMessage for each recipient.
+    * SSLContextFactory - Contains the relevant ssl information for the
+      connection.
+    * EncryptedMessage - An implementation of twisted.mail.smtp.IMessage that
+      knows how to encrypt/sign itself before sending.
+
+
 """
 
 import re
@@ -173,7 +187,6 @@ class SMTPFactory(ServerFactory):
         @return: The protocol.
         @rtype: SMTPDelivery
         """
-        # If needed, we might use ESMTPDelivery here instead.
         smtpProtocol = smtp.SMTP(SMTPDelivery(self._km, self._config))
         smtpProtocol.factory = self
         return smtpProtocol
@@ -305,7 +318,7 @@ class SMTPDelivery(object):
 # EncryptedMessage
 #
 
-class CtxFactory(ssl.ClientContextFactory):
+class SSLContextFactory(ssl.ClientContextFactory):
     def __init__(self, cert, key):
         self.cert = cert
         self.key = key
@@ -450,6 +463,8 @@ class EncryptedMessage(object):
                                                      self._config[PORT_KEY]))
 
         d = defer.Deferred()
+        # we don't pass an ssl context factory to the ESMTPSenderFactory
+        # because ssl will be handled by reactor.connectSSL() below.
         factory = smtp.ESMTPSenderFactory(
             "",  # username is blank because server does not use auth.
             "",  # password is blank because server does not use auth.
@@ -457,15 +472,15 @@ class EncryptedMessage(object):
             self._user.dest.addrstr,
             StringIO(msg),
             d,
-            contextFactory=CtxFactory(self._config[CERT_KEY],
-                                      self._config[KEY_KEY]),
-            requireAuthentication=False)
+            requireAuthentication=False,
+            requireTransportSecurity=True)
         signal(proto.SMTP_SEND_MESSAGE_START, self._user.dest.addrstr)
-        reactor.connectTCP(
+        reactor.connectSSL(
             self._config[HOST_KEY],
             self._config[PORT_KEY],
-            factory
-        )
+            factory,
+            contextFactory=SSLContextFactory(self._config[CERT_KEY],
+                                             self._config[KEY_KEY]))
         d.addCallback(self.sendSuccess)
         d.addErrback(self.sendError)
         return d
diff --git a/src/leap/mail/smtp/tests/__init__.py b/src/leap/mail/smtp/tests/__init__.py
index 7fed7da..9b54de3 100644
--- a/src/leap/mail/smtp/tests/__init__.py
+++ b/src/leap/mail/smtp/tests/__init__.py
@@ -113,8 +113,8 @@ class TestCaseWithKeyManager(BaseLeapTest):
             'username': address,
             'password': '<password>',
             'encrypted_only': True,
-            'cert': 'blah',
-            'key': 'bleh',
+            'cert': 'src/leap/mail/smtp/tests/cert/server.crt',
+            'key': 'src/leap/mail/smtp/tests/cert/server.key',
         }
 
         class Response(object):
diff --git a/src/leap/mail/smtp/tests/cert/server.crt b/src/leap/mail/smtp/tests/cert/server.crt
new file mode 100644
index 0000000..a27391c
--- /dev/null
+++ b/src/leap/mail/smtp/tests/cert/server.crt
@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/src/leap/mail/smtp/tests/cert/server.key b/src/leap/mail/smtp/tests/cert/server.key
new file mode 100644
index 0000000..197a449
--- /dev/null
+++ b/src/leap/mail/smtp/tests/cert/server.key
@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----