#! /usr/bin/python3.8

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"""An RFC 5321 smtp proxy with optional RFC 1870 and RFC 6531 extensions.

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Usage: %(program)s [options] [localhost:localport [remotehost:remoteport]]

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Options:

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--nosetuid

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-n

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This program generally tries to setuid `nobody', unless this flag is

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set. The setuid call will fail if this program is not run as root (in

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which case, use this flag).

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--version

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-V

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Print the version number and exit.

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--class classname

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-c classname

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Use `classname' as the concrete SMTP proxy class. Uses `PureProxy' by

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default.

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--size limit

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-s limit

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Restrict the total size of the incoming message to "limit" number of

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bytes via the RFC 1870 SIZE extension. Defaults to 33554432 bytes.

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--smtputf8

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-u

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Enable the SMTPUTF8 extension and behave as an RFC 6531 smtp proxy.

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--debug

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-d

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Turn on debugging prints.

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--help

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-h

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Print this message and exit.

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Version: %(__version__)s

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If localhost is not given then `localhost' is used, and if localport is not

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given then 8025 is used. If remotehost is not given then `localhost' is used,

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and if remoteport is not given, then 25 is used.

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"""

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# Overview:

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#

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# This file implements the minimal SMTP protocol as defined in RFC 5321. It

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# has a hierarchy of classes which implement the backend functionality for the

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# smtpd. A number of classes are provided:

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#

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# SMTPServer - the base class for the backend. Raises NotImplementedError

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# if you try to use it.

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#

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# DebuggingServer - simply prints each message it receives on stdout.

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#

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# PureProxy - Proxies all messages to a real smtpd which does final

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# delivery. One known problem with this class is that it doesn't handle

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# SMTP errors from the backend server at all. This should be fixed

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# (contributions are welcome!).

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#

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# MailmanProxy - An experimental hack to work with GNU Mailman

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# <www.list.org>. Using this server as your real incoming smtpd, your

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# mailhost will automatically recognize and accept mail destined to Mailman

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# lists when those lists are created. Every message not destined for a list

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# gets forwarded to a real backend smtpd, as with PureProxy. Again, errors

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# are not handled correctly yet.

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#

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#

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# Author: Barry Warsaw <barry@python.org>

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#

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# TODO:

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#

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# - support mailbox delivery

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# - alias files

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# - Handle more ESMTP extensions

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# - handle error codes from the backend smtpd

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import sys

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import os

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import errno

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import getopt

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import time

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import socket

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import asyncore

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import asynchat

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import collections

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from warnings import warn

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from email._header_value_parser import get_addr_spec, get_angle_addr

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__all__ = [

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"SMTPChannel", "SMTPServer", "DebuggingServer", "PureProxy",

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"MailmanProxy",

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]

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program = sys.argv[0]

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__version__ = 'Python SMTP proxy version 0.3'

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class Devnull:

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def write(self, msg): pass

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def flush(self): pass

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DEBUGSTREAM = Devnull()

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NEWLINE = '\n'

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COMMASPACE = ', '

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DATA_SIZE_DEFAULT = 33554432

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def usage(code, msg=''):

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print(__doc__ % globals(), file=sys.stderr)

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if msg:

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print(msg, file=sys.stderr)

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sys.exit(code)

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class SMTPChannel(asynchat.async_chat):

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COMMAND = 0

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DATA = 1

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command_size_limit = 512

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command_size_limits = collections.defaultdict(lambda x=command_size_limit: x)

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@property

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def max_command_size_limit(self):

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try:

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return max(self.command_size_limits.values())

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except ValueError:

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return self.command_size_limit

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def __init__(self, server, conn, addr, data_size_limit=DATA_SIZE_DEFAULT,

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map=None, enable_SMTPUTF8=False, decode_data=False):

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asynchat.async_chat.__init__(self, conn, map=map)

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self.smtp_server = server

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self.conn = conn

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self.addr = addr

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self.data_size_limit = data_size_limit

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self.enable_SMTPUTF8 = enable_SMTPUTF8

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self._decode_data = decode_data

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if enable_SMTPUTF8 and decode_data:

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raise ValueError("decode_data and enable_SMTPUTF8 cannot"

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" be set to True at the same time")

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if decode_data:

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self._emptystring = ''

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self._linesep = '\r\n'

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self._dotsep = '.'

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self._newline = NEWLINE

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else:

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self._emptystring = b''

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self._linesep = b'\r\n'

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self._dotsep = ord(b'.')

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self._newline = b'\n'

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self._set_rset_state()

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self.seen_greeting = ''

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self.extended_smtp = False

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self.command_size_limits.clear()

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self.fqdn = socket.getfqdn()

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try:

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self.peer = conn.getpeername()

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except OSError as err:

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# a race condition may occur if the other end is closing

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# before we can get the peername

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self.close()

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if err.args[0] != errno.ENOTCONN:

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raise

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return

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print('Peer:', repr(self.peer), file=DEBUGSTREAM)

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self.push('220 %s %s' % (self.fqdn, __version__))

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def _set_post_data_state(self):

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"""Reset state variables to their post-DATA state."""

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self.smtp_state = self.COMMAND

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self.mailfrom = None

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self.rcpttos = []

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self.require_SMTPUTF8 = False

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self.num_bytes = 0

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self.set_terminator(b'\r\n')

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def _set_rset_state(self):

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"""Reset all state variables except the greeting."""

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self._set_post_data_state()

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self.received_data = ''

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self.received_lines = []

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# properties for backwards-compatibility

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@property

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def __server(self):

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warn("Access to __server attribute on SMTPChannel is deprecated, "

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"use 'smtp_server' instead", DeprecationWarning, 2)

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return self.smtp_server

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@__server.setter

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def __server(self, value):

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warn("Setting __server attribute on SMTPChannel is deprecated, "

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"set 'smtp_server' instead", DeprecationWarning, 2)

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self.smtp_server = value

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@property

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def __line(self):

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warn("Access to __line attribute on SMTPChannel is deprecated, "

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"use 'received_lines' instead", DeprecationWarning, 2)

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return self.received_lines

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@__line.setter

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def __line(self, value):

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warn("Setting __line attribute on SMTPChannel is deprecated, "

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"set 'received_lines' instead", DeprecationWarning, 2)

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self.received_lines = value

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@property

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def __state(self):

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warn("Access to __state attribute on SMTPChannel is deprecated, "

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"use 'smtp_state' instead", DeprecationWarning, 2)

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return self.smtp_state

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@__state.setter

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def __state(self, value):

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warn("Setting __state attribute on SMTPChannel is deprecated, "

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"set 'smtp_state' instead", DeprecationWarning, 2)

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self.smtp_state = value

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@property

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def __greeting(self):

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warn("Access to __greeting attribute on SMTPChannel is deprecated, "

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"use 'seen_greeting' instead", DeprecationWarning, 2)

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return self.seen_greeting

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@__greeting.setter

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def __greeting(self, value):

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warn("Setting __greeting attribute on SMTPChannel is deprecated, "

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"set 'seen_greeting' instead", DeprecationWarning, 2)

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self.seen_greeting = value

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@property

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def __mailfrom(self):

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warn("Access to __mailfrom attribute on SMTPChannel is deprecated, "

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"use 'mailfrom' instead", DeprecationWarning, 2)

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return self.mailfrom

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@__mailfrom.setter

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def __mailfrom(self, value):

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warn("Setting __mailfrom attribute on SMTPChannel is deprecated, "

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"set 'mailfrom' instead", DeprecationWarning, 2)

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self.mailfrom = value

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@property

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def __rcpttos(self):

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warn("Access to __rcpttos attribute on SMTPChannel is deprecated, "

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"use 'rcpttos' instead", DeprecationWarning, 2)

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return self.rcpttos

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@__rcpttos.setter

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def __rcpttos(self, value):

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warn("Setting __rcpttos attribute on SMTPChannel is deprecated, "

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"set 'rcpttos' instead", DeprecationWarning, 2)

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self.rcpttos = value

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@property

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def __data(self):

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warn("Access to __data attribute on SMTPChannel is deprecated, "

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"use 'received_data' instead", DeprecationWarning, 2)

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return self.received_data

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@__data.setter

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def __data(self, value):

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warn("Setting __data attribute on SMTPChannel is deprecated, "

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"set 'received_data' instead", DeprecationWarning, 2)

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self.received_data = value

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@property

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def __fqdn(self):

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warn("Access to __fqdn attribute on SMTPChannel is deprecated, "

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"use 'fqdn' instead", DeprecationWarning, 2)

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return self.fqdn

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@__fqdn.setter

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def __fqdn(self, value):

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warn("Setting __fqdn attribute on SMTPChannel is deprecated, "

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"set 'fqdn' instead", DeprecationWarning, 2)

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self.fqdn = value

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@property

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def __peer(self):

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warn("Access to __peer attribute on SMTPChannel is deprecated, "

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"use 'peer' instead", DeprecationWarning, 2)

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return self.peer

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@__peer.setter

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def __peer(self, value):

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warn("Setting __peer attribute on SMTPChannel is deprecated, "

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"set 'peer' instead", DeprecationWarning, 2)

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self.peer = value

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@property

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def __conn(self):

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warn("Access to __conn attribute on SMTPChannel is deprecated, "

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"use 'conn' instead", DeprecationWarning, 2)

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return self.conn

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@__conn.setter

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def __conn(self, value):

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warn("Setting __conn attribute on SMTPChannel is deprecated, "

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"set 'conn' instead", DeprecationWarning, 2)

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self.conn = value

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@property

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def __addr(self):

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warn("Access to __addr attribute on SMTPChannel is deprecated, "

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"use 'addr' instead", DeprecationWarning, 2)

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return self.addr

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@__addr.setter

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def __addr(self, value):

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warn("Setting __addr attribute on SMTPChannel is deprecated, "

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"set 'addr' instead", DeprecationWarning, 2)

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self.addr = value

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# Overrides base class for convenience.

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def push(self, msg):

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asynchat.async_chat.push(self, bytes(

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msg + '\r\n', 'utf-8' if self.require_SMTPUTF8 else 'ascii'))

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# Implementation of base class abstract method

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def collect_incoming_data(self, data):

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limit = None

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if self.smtp_state == self.COMMAND:

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limit = self.max_command_size_limit

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elif self.smtp_state == self.DATA:

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limit = self.data_size_limit

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if limit and self.num_bytes > limit:

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return

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elif limit:

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self.num_bytes += len(data)

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if self._decode_data:

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self.received_lines.append(str(data, 'utf-8'))

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else:

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self.received_lines.append(data)

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# Implementation of base class abstract method

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def found_terminator(self):

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line = self._emptystring.join(self.received_lines)

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print('Data:', repr(line), file=DEBUGSTREAM)

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self.received_lines = []

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if self.smtp_state == self.COMMAND:

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sz, self.num_bytes = self.num_bytes, 0

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if not line:

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self.push('500 Error: bad syntax')

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return

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if not self._decode_data:

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line = str(line, 'utf-8')

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i = line.find(' ')

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if i < 0:

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command = line.upper()

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arg = None

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else:

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command = line[:i].upper()

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arg = line[i+1:].strip()

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max_sz = (self.command_size_limits[command]

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if self.extended_smtp else self.command_size_limit)

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if sz > max_sz:

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self.push('500 Error: line too long')

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return

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method = getattr(self, 'smtp_' + command, None)

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if not method:

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self.push('500 Error: command "%s" not recognized' % command)

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return

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method(arg)

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return

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else:

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if self.smtp_state != self.DATA:

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self.push('451 Internal confusion')

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self.num_bytes = 0

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return

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if self.data_size_limit and self.num_bytes > self.data_size_limit:

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self.push('552 Error: Too much mail data')

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self.num_bytes = 0

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return

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# Remove extraneous carriage returns and de-transparency according

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# to RFC 5321, Section 4.5.2.

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data = []

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for text in line.split(self._linesep):

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if text and text[0] == self._dotsep:

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data.append(text[1:])

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else:

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data.append(text)

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self.received_data = self._newline.join(data)

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args = (self.peer, self.mailfrom, self.rcpttos, self.received_data)

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kwargs = {}

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if not self._decode_data:

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kwargs = {

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'mail_options': self.mail_options,

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'rcpt_options': self.rcpt_options,

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}

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status = self.smtp_server.process_message(*args, **kwargs)

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self._set_post_data_state()

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if not status:

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self.push('250 OK')

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else:

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self.push(status)

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# SMTP and ESMTP commands

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def smtp_HELO(self, arg):

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if not arg:

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self.push('501 Syntax: HELO hostname')

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return

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# See issue #21783 for a discussion of this behavior.

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if self.seen_greeting:

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self.push('503 Duplicate HELO/EHLO')

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return

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self._set_rset_state()

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self.seen_greeting = arg

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self.push('250 %s' % self.fqdn)

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def smtp_EHLO(self, arg):

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if not arg:

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self.push('501 Syntax: EHLO hostname')

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return

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# See issue #21783 for a discussion of this behavior.

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if self.seen_greeting:

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self.push('503 Duplicate HELO/EHLO')

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return

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self._set_rset_state()

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self.seen_greeting = arg

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self.extended_smtp = True

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self.push('250-%s' % self.fqdn)

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if self.data_size_limit:

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self.push('250-SIZE %s' % self.data_size_limit)

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self.command_size_limits['MAIL'] += 26

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if not self._decode_data:

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self.push('250-8BITMIME')

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if self.enable_SMTPUTF8:

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self.push('250-SMTPUTF8')

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self.command_size_limits['MAIL'] += 10

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self.push('250 HELP')

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def smtp_NOOP(self, arg):

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if arg:

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self.push('501 Syntax: NOOP')

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else:

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self.push('250 OK')

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def smtp_QUIT(self, arg):

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# args is ignored

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self.push('221 Bye')

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self.close_when_done()

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def _strip_command_keyword(self, keyword, arg):

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keylen = len(keyword)

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if arg[:keylen].upper() == keyword:

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return arg[keylen:].strip()

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return ''

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def _getaddr(self, arg):

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if not arg:

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return '', ''

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if arg.lstrip().startswith('<'):

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address, rest = get_angle_addr(arg)

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else:

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address, rest = get_addr_spec(arg)

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if not address:

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return address, rest

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return address.addr_spec, rest

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def _getparams(self, params):

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# Return params as dictionary. Return None if not all parameters

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# appear to be syntactically valid according to RFC 1869.

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result = {}

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for param in params:

[459] Fix | Delete

param, eq, value = param.partition('=')

[460] Fix | Delete

if not param.isalnum() or eq and not value:

[461] Fix | Delete

return None

[462] Fix | Delete

result[param] = value if eq else True

[463] Fix | Delete

return result

[464] Fix | Delete

[465] Fix | Delete

def smtp_HELP(self, arg):

[466] Fix | Delete

if arg:

[467] Fix | Delete

extended = ' [SP <mail-parameters>]'

[468] Fix | Delete

lc_arg = arg.upper()

[469] Fix | Delete

if lc_arg == 'EHLO':

[470] Fix | Delete

self.push('250 Syntax: EHLO hostname')

[471] Fix | Delete

elif lc_arg == 'HELO':

[472] Fix | Delete

self.push('250 Syntax: HELO hostname')

[473] Fix | Delete

elif lc_arg == 'MAIL':

[474] Fix | Delete

msg = '250 Syntax: MAIL FROM: <address>'

[475] Fix | Delete

if self.extended_smtp:

[476] Fix | Delete

msg += extended

[477] Fix | Delete

self.push(msg)

[478] Fix | Delete

elif lc_arg == 'RCPT':

[479] Fix | Delete

msg = '250 Syntax: RCPT TO: <address>'

[480] Fix | Delete

if self.extended_smtp:

[481] Fix | Delete

msg += extended

[482] Fix | Delete

self.push(msg)

[483] Fix | Delete

elif lc_arg == 'DATA':

[484] Fix | Delete

self.push('250 Syntax: DATA')

[485] Fix | Delete

elif lc_arg == 'RSET':

[486] Fix | Delete

self.push('250 Syntax: RSET')

[487] Fix | Delete

elif lc_arg == 'NOOP':

[488] Fix | Delete

self.push('250 Syntax: NOOP')

[489] Fix | Delete

elif lc_arg == 'QUIT':

[490] Fix | Delete

self.push('250 Syntax: QUIT')

[491] Fix | Delete

elif lc_arg == 'VRFY':

[492] Fix | Delete

self.push('250 Syntax: VRFY <address>')

[493] Fix | Delete

else:

[494] Fix | Delete

self.push('501 Supported commands: EHLO HELO MAIL RCPT '

[495] Fix | Delete

'DATA RSET NOOP QUIT VRFY')

[496] Fix | Delete

else:

[497] Fix | Delete

self.push('250 Supported commands: EHLO HELO MAIL RCPT DATA '

[498] Fix | Delete

'RSET NOOP QUIT VRFY')

[499] Fix | Delete