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""" Mail protocol support. """ from __future__ import absolute_import, division from twisted.mail import pop3 from twisted.mail import smtp from twisted.internet import protocol from twisted.internet import defer from twisted.copyright import longversion from twisted.python import log from twisted.cred.credentials import CramMD5Credentials, UsernamePassword from twisted.cred.error import UnauthorizedLogin from twisted.mail import relay from zope.interface import implementer @implementer(smtp.IMessageDelivery) class DomainDeliveryBase: """ A base class for message delivery using the domains of a mail service. @ivar service: See L{__init__} @ivar user: See L{__init__} @ivar host: See L{__init__} @type protocolName: L{bytes} @ivar protocolName: The protocol being used to deliver the mail. Sub-classes should set this appropriately. """ service = None protocolName = None def __init__(self, service, user, host=smtp.DNSNAME): """ @type service: L{MailService} @param service: A mail service. @type user: L{bytes} or L{None} @param user: The authenticated SMTP user. @type host: L{bytes} @param host: The hostname. """ self.service = service self.user = user self.host = host def receivedHeader(self, helo, origin, recipients): """ Generate a received header string for a message. @type helo: 2-L{tuple} of (L{bytes}, L{bytes}) @param helo: The client's identity as sent in the HELO command and its IP address. @type origin: L{Address} @param origin: The origination address of the message. @type recipients: L{list} of L{User} @param recipients: The destination addresses for the message. @rtype: L{bytes} @return: A received header string. """ authStr = heloStr = b"" if self.user: authStr = b" auth=" + self.user.encode('xtext') if helo[0]: heloStr = b" helo=" + helo[0] fromUser = (b"from " + helo[0] + b" ([" + helo[1] + b"]" + heloStr + authStr) by = (b"by " + self.host + b" with " + self.protocolName + b" (" + longversion.encode("ascii") + b")") forUser = (b"for <" + b' '.join(map(bytes, recipients)) + b"> " + smtp.rfc822date()) return (b"Received: " + fromUser + b"\n\t" + by + b"\n\t" + forUser) def validateTo(self, user): """ Validate the address for which a message is destined. @type user: L{User} @param user: The destination address. @rtype: L{Deferred } which successfully fires with no-argument callable which returns L{IMessage } provider. @return: A deferred which successfully fires with a no-argument callable which returns a message receiver for the destination. @raise SMTPBadRcpt: When messages cannot be accepted for the destination address. """ # XXX - Yick. This needs cleaning up. if self.user and self.service.queue: d = self.service.domains.get(user.dest.domain, None) if d is None: d = relay.DomainQueuer(self.service, True) else: d = self.service.domains[user.dest.domain] return defer.maybeDeferred(d.exists, user) def validateFrom(self, helo, origin): """ Validate the address from which a message originates. @type helo: 2-L{tuple} of (L{bytes}, L{bytes}) @param helo: The client's identity as sent in the HELO command and its IP address. @type origin: L{Address} @param origin: The origination address of the message. @rtype: L{Address} @return: The origination address. @raise SMTPBadSender: When messages cannot be accepted from the origination address. """ if not helo: raise smtp.SMTPBadSender(origin, 503, "Who are you? Say HELO first.") if origin.local != b'' and origin.domain == b'': raise smtp.SMTPBadSender(origin, 501, "Sender address must contain domain.") return origin class SMTPDomainDelivery(DomainDeliveryBase): """ A domain delivery base class for use in an SMTP server. """ protocolName = b'smtp' class ESMTPDomainDelivery(DomainDeliveryBase): """ A domain delivery base class for use in an ESMTP server. """ protocolName = b'esmtp' class SMTPFactory(smtp.SMTPFactory): """ An SMTP server protocol factory. @ivar service: See L{__init__} @ivar portal: See L{__init__} @type protocol: no-argument callable which returns a L{Protocol } subclass @ivar protocol: A callable which creates a protocol. The default value is L{SMTP}. """ protocol = smtp.SMTP portal = None def __init__(self, service, portal = None): """ @type service: L{MailService} @param service: An email service. @type portal: L{Portal } or L{None} @param portal: A portal to use for authentication. """ smtp.SMTPFactory.__init__(self) self.service = service self.portal = portal def buildProtocol(self, addr): """ Create an instance of an SMTP server protocol. @type addr: L{IAddress } provider @param addr: The address of the SMTP client. @rtype: L{SMTP} @return: An SMTP protocol. """ log.msg('Connection from %s' % (addr,)) p = smtp.SMTPFactory.buildProtocol(self, addr) p.service = self.service p.portal = self.portal return p class ESMTPFactory(SMTPFactory): """ An ESMTP server protocol factory. @type protocol: no-argument callable which returns a L{Protocol } subclass @ivar protocol: A callable which creates a protocol. The default value is L{ESMTP}. @type context: L{IOpenSSLContextFactory } or L{None} @ivar context: A factory to generate contexts to be used in negotiating encrypted communication. @type challengers: L{dict} mapping L{bytes} to no-argument callable which returns L{ICredentials } subclass provider. @ivar challengers: A mapping of acceptable authorization mechanism to callable which creates credentials to use for authentication. """ protocol = smtp.ESMTP context = None def __init__(self, *args): """ @param args: Arguments for L{SMTPFactory.__init__} @see: L{SMTPFactory.__init__} """ SMTPFactory.__init__(self, *args) self.challengers = { b'CRAM-MD5': CramMD5Credentials } def buildProtocol(self, addr): """ Create an instance of an ESMTP server protocol. @type addr: L{IAddress } provider @param addr: The address of the ESMTP client. @rtype: L{ESMTP} @return: An ESMTP protocol. """ p = SMTPFactory.buildProtocol(self, addr) p.challengers = self.challengers p.ctx = self.context return p class VirtualPOP3(pop3.POP3): """ A virtual hosting POP3 server. @type service: L{MailService} @ivar service: The email service that created this server. This must be set by the service. @type domainSpecifier: L{bytes} @ivar domainSpecifier: The character to use to split an email address into local-part and domain. The default is '@'. """ service = None domainSpecifier = b'@' # Gaagh! I hate POP3. No standardized way # to indicate user@host. '@' doesn't work # with NS, e.g. def authenticateUserAPOP(self, user, digest): """ Perform APOP authentication. Override the default lookup scheme to allow virtual domains. @type user: L{bytes} @param user: The name of the user attempting to log in. @type digest: L{bytes} @param digest: The challenge response. @rtype: L{Deferred} which successfully results in 3-L{tuple} of (L{IMailbox }, L{IMailbox } provider, no-argument callable) @return: A deferred which fires when authentication is complete. If successful, it returns an L{IMailbox } interface, a mailbox and a logout function. If authentication fails, the deferred fails with an L{UnauthorizedLogin } error. """ user, domain = self.lookupDomain(user) try: portal = self.service.lookupPortal(domain) except KeyError: return defer.fail(UnauthorizedLogin()) else: return portal.login( pop3.APOPCredentials(self.magic, user, digest), None, pop3.IMailbox ) def authenticateUserPASS(self, user, password): """ Perform authentication for a username/password login. Override the default lookup scheme to allow virtual domains. @type user: L{bytes} @param user: The name of the user attempting to log in. @type password: L{bytes} @param password: The password to authenticate with. @rtype: L{Deferred} which successfully results in 3-L{tuple} of (L{IMailbox }, L{IMailbox } provider, no-argument callable) @return: A deferred which fires when authentication is complete. If successful, it returns an L{IMailbox } interface, a mailbox and a logout function. If authentication fails, the deferred fails with an L{UnauthorizedLogin } error. """ user, domain = self.lookupDomain(user) try: portal = self.service.lookupPortal(domain) except KeyError: return defer.fail(UnauthorizedLogin()) else: return portal.login( UsernamePassword(user, password), None, pop3.IMailbox ) def lookupDomain(self, user): """ Check whether a domain is among the virtual domains supported by the mail service. @type user: L{bytes} @param user: An email address. @rtype: 2-L{tuple} of (L{bytes}, L{bytes}) @return: The local part and the domain part of the email address if the domain is supported. @raise POP3Error: When the domain is not supported by the mail service. """ try: user, domain = user.split(self.domainSpecifier, 1) except ValueError: domain = b'' if domain not in self.service.domains: raise pop3.POP3Error( "no such domain {}".format(domain.decode("utf-8"))) return user, domain class POP3Factory(protocol.ServerFactory): """ A POP3 server protocol factory. @ivar service: See L{__init__} @type protocol: no-argument callable which returns a L{Protocol } subclass @ivar protocol: A callable which creates a protocol. The default value is L{VirtualPOP3}. """ protocol = VirtualPOP3 service = None def __init__(self, service): """ @type service: L{MailService} @param service: An email service. """ self.service = service def buildProtocol(self, addr): """ Create an instance of a POP3 server protocol. @type addr: L{IAddress } provider @param addr: The address of the POP3 client. @rtype: L{POP3} @return: A POP3 protocol. """ p = protocol.ServerFactory.buildProtocol(self, addr) p.service = self.service return p