diff options
Diffstat (limited to 'src/leap/mail/smtp/gateway.py')
| -rw-r--r-- | src/leap/mail/smtp/gateway.py | 218 |
1 files changed, 160 insertions, 58 deletions
diff --git a/src/leap/mail/smtp/gateway.py b/src/leap/mail/smtp/gateway.py index 45560bf..bd0be6f 100644 --- a/src/leap/mail/smtp/gateway.py +++ b/src/leap/mail/smtp/gateway.py @@ -29,19 +29,27 @@ The following classes comprise the SMTP gateway service: * EncryptedMessage - An implementation of twisted.mail.smtp.IMessage that knows how to encrypt/sign itself before sending. """ +from email.Header import Header from zope.interface import implements +from zope.interface import implementer + +from twisted.cred.portal import Portal, IRealm from twisted.mail import smtp -from twisted.internet.protocol import ServerFactory +from twisted.mail.imap4 import LOGINCredentials, PLAINCredentials +from twisted.internet import defer, protocol from twisted.python import log -from email.Header import Header from leap.common.check import leap_assert_type from leap.common.events import emit_async, catalog -from leap.keymanager.openpgp import OpenPGPKey -from leap.keymanager.errors import KeyNotFound +from leap.mail import errors +from leap.mail.cred import LocalSoledadTokenChecker from leap.mail.utils import validate_address from leap.mail.rfc3156 import RFC3156CompliantGenerator +from leap.mail.outgoing.service import outgoingFactory +from leap.mail.smtp.bounces import bouncerFactory +from leap.keymanager.openpgp import OpenPGPKey +from leap.keymanager.errors import KeyNotFound # replace email generator with a RFC 3156 compliant one. from email import generator @@ -49,84 +57,176 @@ from email import generator generator.Generator = RFC3156CompliantGenerator -# -# Helper utilities -# - LOCAL_FQDN = "bitmask.local" -class SMTPHeloLocalhost(smtp.SMTP): +@implementer(IRealm) +class LocalSMTPRealm(object): + + _encoding = 'utf-8' + + def __init__(self, keymanager_sessions, soledad_sessions, sendmail_opts, + encrypted_only=False): + """ + :param keymanager_sessions: a dict-like object, containing instances + of a Keymanager objects, indexed by + userid. + """ + self._keymanager_sessions = keymanager_sessions + self._soledad_sessions = soledad_sessions + self._sendmail_opts = sendmail_opts + self.encrypted_only = encrypted_only + + def requestAvatar(self, avatarId, mind, *interfaces): + + if isinstance(avatarId, str): + avatarId = avatarId.decode(self._encoding) + + def gotKeymanagerAndSoledad(result): + keymanager, soledad = result + d = bouncerFactory(soledad) + d.addCallback(lambda bouncer: (keymanager, soledad, bouncer)) + return d + + def getMessageDelivery(result): + keymanager, soledad, bouncer = result + # TODO use IMessageDeliveryFactory instead ? + # it could reuse the connections. + if smtp.IMessageDelivery in interfaces: + userid = avatarId + opts = self.getSendingOpts(userid) + + outgoing = outgoingFactory( + userid, keymanager, opts, bouncer=bouncer) + avatar = SMTPDelivery(userid, keymanager, self.encrypted_only, + outgoing) + + return (smtp.IMessageDelivery, avatar, + getattr(avatar, 'logout', lambda: None)) + + raise NotImplementedError(self, interfaces) + + d1 = self.lookupKeymanagerInstance(avatarId) + d2 = self.lookupSoledadInstance(avatarId) + d = defer.gatherResults([d1, d2]) + d.addCallback(gotKeymanagerAndSoledad) + d.addCallback(getMessageDelivery) + return d + + def lookupKeymanagerInstance(self, userid): + print 'getting KM INSTNACE>>>' + try: + keymanager = self._keymanager_sessions[userid] + except: + raise errors.AuthenticationError( + 'No keymanager session found for user %s. Is it authenticated?' + % userid) + # XXX this should return the instance after whenReady callback + return defer.succeed(keymanager) + + def lookupSoledadInstance(self, userid): + try: + soledad = self._soledad_sessions[userid] + except: + raise errors.AuthenticationError( + 'No soledad session found for user %s. Is it authenticated?' + % userid) + # XXX this should return the instance after whenReady callback + return defer.succeed(soledad) + + def getSendingOpts(self, userid): + try: + opts = self._sendmail_opts[userid] + except KeyError: + raise errors.ConfigurationError( + 'No sendingMail options found for user %s' % userid) + return opts + + +class SMTPTokenChecker(LocalSoledadTokenChecker): + """A credentials checker that will lookup a token for the SMTP service. + For now it will be using the same identifier than IMAPTokenChecker""" + + service = 'mail_auth' + + # TODO besides checking for token credential, + # we could also verify the certificate here. + + +class LEAPInitMixin(object): + + """ + A Mixin that takes care of initialization of all the data needed to access + LEAP sessions. """ - An SMTP class that ensures a proper FQDN - for localhost. + def __init__(self, soledad_sessions, keymanager_sessions, sendmail_opts, + encrypted_only=False): + realm = LocalSMTPRealm( + keymanager_sessions, soledad_sessions, sendmail_opts, + encrypted_only) + portal = Portal(realm) + + checker = SMTPTokenChecker(soledad_sessions) + self.checker = checker + self.portal = portal + portal.registerChecker(checker) - This avoids a problem in which unproperly configured providers - would complain about the helo not being a fqdn. + +class LocalSMTPServer(smtp.ESMTP, LEAPInitMixin): + """ + The Production ESMTP Server: Authentication Needed. + Authenticates against SMTP Token stored in Local Soledad instance. + The Realm will produce a Delivery Object that handles encryption/signing. """ - def __init__(self, *args): - smtp.SMTP.__init__(self, *args) - self.host = LOCAL_FQDN + # TODO: implement Queue using twisted.mail.mail.MailService + + def __init__(self, soledads, keyms, sendmailopts, *args, **kw): + encrypted_only = kw.pop('encrypted_only', False) + + LEAPInitMixin.__init__(self, soledads, keyms, sendmailopts, + encrypted_only) + smtp.ESMTP.__init__(self, *args, **kw) -class SMTPFactory(ServerFactory): +# TODO implement retries -- see smtp.SenderMixin +class SMTPFactory(protocol.ServerFactory): """ Factory for an SMTP server with encrypted gatewaying capabilities. """ + + protocol = LocalSMTPServer domain = LOCAL_FQDN + timeout = 600 + encrypted_only = False - def __init__(self, userid, keymanager, encrypted_only, outgoing_mail): - """ - Initialize the SMTP factory. + def __init__(self, soledad_sessions, keymanager_sessions, sendmail_opts, + deferred=None, retries=3): - :param userid: The user currently logged in - :type userid: unicode - :param keymanager: A Key Manager from where to get recipients' public - keys. - :param encrypted_only: Whether the SMTP gateway should send unencrypted - mail or not. - :type encrypted_only: bool - :param outgoing_mail: The outgoing mail to send the message - :type outgoing_mail: leap.mail.outgoing.service.OutgoingMail - """ - - leap_assert_type(encrypted_only, bool) - # and store them - self._userid = userid - self._km = keymanager - self._outgoing_mail = outgoing_mail - self._encrypted_only = encrypted_only + self._soledad_sessions = soledad_sessions + self._keymanager_sessions = keymanager_sessions + self._sendmail_opts = sendmail_opts def buildProtocol(self, addr): - """ - Return a protocol suitable for the job. - - :param addr: An address, e.g. a TCP (host, port). - :type addr: twisted.internet.interfaces.IAddress - - @return: The protocol. - @rtype: SMTPDelivery - """ - smtpProtocol = SMTPHeloLocalhost( - SMTPDelivery( - self._userid, self._km, self._encrypted_only, - self._outgoing_mail)) - smtpProtocol.factory = self - return smtpProtocol + p = self.protocol( + self._soledad_sessions, self._keymanager_sessions, + self._sendmail_opts, encrypted_only=self.encrypted_only) + p.factory = self + p.host = LOCAL_FQDN + p.challengers = {"LOGIN": LOGINCredentials, "PLAIN": PLAINCredentials} + return p # # SMTPDelivery # +@implementer(smtp.IMessageDelivery) class SMTPDelivery(object): """ Validate email addresses and handle message delivery. """ - implements(smtp.IMessageDelivery) - def __init__(self, userid, keymanager, encrypted_only, outgoing_mail): """ Initialize the SMTP delivery object. @@ -202,20 +302,21 @@ class SMTPDelivery(object): def found(_): log.msg("Accepting mail for %s..." % user.dest.addrstr) emit_async(catalog.SMTP_RECIPIENT_ACCEPTED_ENCRYPTED, - user.dest.addrstr) + self._userid, user.dest.addrstr) def not_found(failure): failure.trap(KeyNotFound) # if key was not found, check config to see if will send anyway if self._encrypted_only: - emit_async(catalog.SMTP_RECIPIENT_REJECTED, user.dest.addrstr) + emit_async(catalog.SMTP_RECIPIENT_REJECTED, self._userid, + user.dest.addrstr) raise smtp.SMTPBadRcpt(user.dest.addrstr) log.msg("Warning: will send an unencrypted message (because " "encrypted_only' is set to False).") emit_async( catalog.SMTP_RECIPIENT_ACCEPTED_UNENCRYPTED, - user.dest.addrstr) + self._userid, user.dest.addrstr) def encrypt_func(_): return lambda: EncryptedMessage(user, self._outgoing_mail) @@ -307,7 +408,8 @@ class EncryptedMessage(object): """ log.msg("Connection lost unexpectedly!") log.err() - emit_async(catalog.SMTP_CONNECTION_LOST, self._user.dest.addrstr) + emit_async(catalog.SMTP_CONNECTION_LOST, self._userid, + self._user.dest.addrstr) # unexpected loss of connection; don't save self._lines = [] |