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#8739: upgrade smtpd to RFC 5321 and 1870. 

smtpd now handles EHLO and has infrastructure for extended smtp command mode.
The SIZE extension is also implemented.  In order to support parameters on
MAIL FROM, the RFC 5322 parser from the email package is used to parse the
address "token".

Logging subclasses things and overrides __init__, so it was necessary to
update those __init__ functions in the logging tests to make the logging tests
pass.

The original suggestion and patch were by Alberto Trevino.  Juhana Jauhiainen
added the --size argument and SIZE parameter support.  Michele Orrù improved
the patch and added more tests.  Dan Boswell conditionalized various bits of
code on whether or not we are in HELO or EHLO mode, as well as some other
improvements and tests.  I finalized the patch and added the address parsing.
This commit is contained in:
R David Murray 2012-05-26 14:33:59 -04:00
parent 032eed3c4a
commit d1a30c939c
7 changed files with 483 additions and 92 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
Doc/library/smtpd.rst
View File

@ -20,17 +20,24 @@ specific mail-sending strategies.
Additionally the SMTPChannel may be extended to implement very specific
interaction behaviour with SMTP clients.
The code supports :RFC:`5321`, plus the :rfc:`1870` SIZE extension.
SMTPServer Objects
------------------
.. class:: SMTPServer(localaddr, remoteaddr)
.. class:: SMTPServer(localaddr, remoteaddr, data_size_limit=33554432)
Create a new :class:`SMTPServer` object, which binds to local address
*localaddr*. It will treat *remoteaddr* as an upstream SMTP relayer. It
inherits from :class:`asyncore.dispatcher`, and so will insert itself into
:mod:`asyncore`'s event loop on instantiation.
*data_size_limit* specifies the maximum number of bytes that will be
accepted in a ``DATA`` command. A value of ``None`` or ``0`` means no
limit.
.. method:: process_message(peer, mailfrom, rcpttos, data)
Raise :exc:`NotImplementedError` exception. Override this in subclasses to
@ -155,11 +162,15 @@ SMTPChannel Objects
Command Action taken
======== ===================================================================
HELO Accepts the greeting from the client and stores it in
:attr:`seen_greeting`.
:attr:`seen_greeting`. Sets server to base command mode.
EHLO Accepts the greeting from the client and stores it in
:attr:`seen_greeting`. Sets server to extended command mode.
NOOP Takes no action.
QUIT Closes the connection cleanly.
MAIL Accepts the "MAIL FROM:" syntax and stores the supplied address as
:attr:`mailfrom`.
:attr:`mailfrom`. In extended command mode, accepts the
:rfc:`1870` SIZE attribute and responds appropriately based on the
value of ``data_size_limit``.
RCPT Accepts the "RCPT TO:" syntax and stores the supplied addresses in
the :attr:`rcpttos` list.
RSET Resets the :attr:`mailfrom`, :attr:`rcpttos`, and
@ -167,4 +178,7 @@ SMTPChannel Objects
DATA Sets the internal state to :attr:`DATA` and stores remaining lines
from the client in :attr:`received_data` until the terminator
"\r\n.\r\n" is received.
HELP Returns minimal information on command syntax
VRFY Returns code 252 (the server doesn't know if the address is valid)
EXPN Reports that the command is not implemented.
======== ===================================================================

243
Lib/smtpd.py
View File

@ -1,5 +1,5 @@
#! /usr/bin/env python3
"""An RFC 2821 smtp proxy.
"""An RFC 5321 smtp proxy.
Usage: %(program)s [options] [localhost:localport [remotehost:remoteport]]
@ -20,6 +20,11 @@ Options:
Use `classname' as the concrete SMTP proxy class. Uses `PureProxy' by
default.
--size limit
-s limit
Restrict the total size of the incoming message to "limit" number of
bytes via the RFC 1870 SIZE extension. Defaults to 33554432 bytes.
--debug
-d
Turn on debugging prints.
@ -35,10 +40,9 @@ given then 8025 is used. If remotehost is not given then `localhost' is used,
and if remoteport is not given, then 25 is used.
"""
# Overview:
#
# This file implements the minimal SMTP protocol as defined in RFC 821. It
# This file implements the minimal SMTP protocol as defined in RFC 5321. It
# has a hierarchy of classes which implement the backend functionality for the
# smtpd. A number of classes are provided:
#
@ -66,7 +70,7 @@ and if remoteport is not given, then 25 is used.
#
# - support mailbox delivery
# - alias files
# - ESMTP
# - Handle more ESMTP extensions
# - handle error codes from the backend smtpd
import sys
@ -77,12 +81,14 @@ import time
import socket
import asyncore
import asynchat
import collections
from warnings import warn
from email._header_value_parser import get_addr_spec, get_angle_addr
__all__ = ["SMTPServer","DebuggingServer","PureProxy","MailmanProxy"]
program = sys.argv[0]
__version__ = 'Python SMTP proxy version 0.2'
__version__ = 'Python SMTP proxy version 0.3'
class Devnull:
@ -94,9 +100,9 @@ DEBUGSTREAM = Devnull()
NEWLINE = '\n'
EMPTYSTRING = ''
COMMASPACE = ', '
DATA_SIZE_DEFAULT = 33554432
def usage(code, msg=''):
print(__doc__ % globals(), file=sys.stderr)
if msg:
@ -104,19 +110,23 @@ def usage(code, msg=''):
sys.exit(code)
class SMTPChannel(asynchat.async_chat):
COMMAND = 0
DATA = 1
data_size_limit = 33554432
command_size_limit = 512
command_size_limits = collections.defaultdict(lambda x=command_size_limit: x)
command_size_limits.update({
'MAIL': command_size_limit + 26,
})
max_command_size_limit = max(command_size_limits.values())
def __init__(self, server, conn, addr):
def __init__(self, server, conn, addr, data_size_limit=DATA_SIZE_DEFAULT):
asynchat.async_chat.__init__(self, conn)
self.smtp_server = server
self.conn = conn
self.addr = addr
self.data_size_limit = data_size_limit
self.received_lines = []
self.smtp_state = self.COMMAND
self.seen_greeting = ''
@ -137,6 +147,7 @@ class SMTPChannel(asynchat.async_chat):
print('Peer:', repr(self.peer), file=DEBUGSTREAM)
self.push('220 %s %s' % (self.fqdn, __version__))
self.set_terminator(b'\r\n')
self.extended_smtp = False
# properties for backwards-compatibility
@property
@ -268,7 +279,7 @@ class SMTPChannel(asynchat.async_chat):
def collect_incoming_data(self, data):
limit = None
if self.smtp_state == self.COMMAND:
limit = self.command_size_limit
limit = self.max_command_size_limit
elif self.smtp_state == self.DATA:
limit = self.data_size_limit
if limit and self.num_bytes > limit:
@ -283,11 +294,7 @@ class SMTPChannel(asynchat.async_chat):
print('Data:', repr(line), file=DEBUGSTREAM)
self.received_lines = []
if self.smtp_state == self.COMMAND:
if self.num_bytes > self.command_size_limit:
self.push('500 Error: line too long')
self.num_bytes = 0
return
self.num_bytes = 0
sz, self.num_bytes = self.num_bytes, 0
if not line:
self.push('500 Error: bad syntax')
return
@ -299,9 +306,14 @@ class SMTPChannel(asynchat.async_chat):
else:
command = line[:i].upper()
arg = line[i+1:].strip()
max_sz = (self.command_size_limits[command]
if self.extended_smtp else self.command_size_limit)
if sz > max_sz:
self.push('500 Error: line too long')
return
method = getattr(self, 'smtp_' + command, None)
if not method:
self.push('502 Error: command "%s" not implemented' % command)
self.push('500 Error: command "%s" not recognized' % command)
return
method(arg)
return
@ -310,12 +322,12 @@ class SMTPChannel(asynchat.async_chat):
self.push('451 Internal confusion')
self.num_bytes = 0
return
if self.num_bytes > self.data_size_limit:
if self.data_size_limit and self.num_bytes > self.data_size_limit:
self.push('552 Error: Too much mail data')
self.num_bytes = 0
return
# Remove extraneous carriage returns and de-transparency according
# to RFC 821, Section 4.5.2.
# to RFC 5321, Section 4.5.2.
data = []
for text in line.split('\r\n'):
if text and text[0] == '.':
@ -333,7 +345,7 @@ class SMTPChannel(asynchat.async_chat):
self.num_bytes = 0
self.set_terminator(b'\r\n')
if not status:
self.push('250 Ok')
self.push('250 OK')
else:
self.push(status)
@ -346,66 +358,188 @@ class SMTPChannel(asynchat.async_chat):
self.push('503 Duplicate HELO/EHLO')
else:
self.seen_greeting = arg
self.extended_smtp = False
self.push('250 %s' % self.fqdn)
def smtp_EHLO(self, arg):
if not arg:
self.push('501 Syntax: EHLO hostname')
return
if self.seen_greeting:
self.push('503 Duplicate HELO/EHLO')
else:
self.seen_greeting = arg
self.extended_smtp = True
self.push('250-%s' % self.fqdn)
if self.data_size_limit:
self.push('250-SIZE %s' % self.data_size_limit)
self.push('250 HELP')
def smtp_NOOP(self, arg):
if arg:
self.push('501 Syntax: NOOP')
else:
self.push('250 Ok')
self.push('250 OK')
def smtp_QUIT(self, arg):
# args is ignored
self.push('221 Bye')
self.close_when_done()
# factored
def __getaddr(self, keyword, arg):
address = None
def _strip_command_keyword(self, keyword, arg):
keylen = len(keyword)
if arg[:keylen].upper() == keyword:
address = arg[keylen:].strip()
return arg[keylen:].strip()
return ''
def _getaddr(self, arg):
if not arg:
return '', ''
if arg.lstrip().startswith('<'):
address, rest = get_angle_addr(arg)
else:
address, rest = get_addr_spec(arg)
if not address:
pass
elif address[0] == '<' and address[-1] == '>' and address != '<>':
# Addresses can be in the form <person@dom.com> but watch out
# for null address, e.g. <>
address = address[1:-1]
return address
return address, rest
return address.addr_spec, rest
def _getparams(self, params):
# Return any parameters that appear to be syntactically valid according
# to RFC 1869, ignore all others. (Postel rule: accept what we can.)
params = [param.split('=', 1) for param in params.split()
if '=' in param]
return {k: v for k, v in params if k.isalnum()}
def smtp_HELP(self, arg):
if arg:
extended = ' [SP <mail parameters]'
lc_arg = arg.upper()
if lc_arg == 'EHLO':
self.push('250 Syntax: EHLO hostname')
elif lc_arg == 'HELO':
self.push('250 Syntax: HELO hostname')
elif lc_arg == 'MAIL':
msg = '250 Syntax: MAIL FROM: <address>'
if self.extended_smtp:
msg += extended
self.push(msg)
elif lc_arg == 'RCPT':
msg = '250 Syntax: RCPT TO: <address>'
if self.extended_smtp:
msg += extended
self.push(msg)
elif lc_arg == 'DATA':
self.push('250 Syntax: DATA')
elif lc_arg == 'RSET':
self.push('250 Syntax: RSET')
elif lc_arg == 'NOOP':
self.push('250 Syntax: NOOP')
elif lc_arg == 'QUIT':
self.push('250 Syntax: QUIT')
elif lc_arg == 'VRFY':
self.push('250 Syntax: VRFY <address>')
else:
self.push('501 Supported commands: EHLO HELO MAIL RCPT '
'DATA RSET NOOP QUIT VRFY')
else:
self.push('250 Supported commands: EHLO HELO MAIL RCPT DATA '
'RSET NOOP QUIT VRFY')
def smtp_VRFY(self, arg):
if arg:
address, params = self._getaddr(arg)
if address:
self.push('252 Cannot VRFY user, but will accept message '
'and attempt delivery')
else:
self.push('502 Could not VRFY %s' % arg)
else:
self.push('501 Syntax: VRFY <address>')
def smtp_MAIL(self, arg):
if not self.seen_greeting:
self.push('503 Error: send HELO first');
return
print('===> MAIL', arg, file=DEBUGSTREAM)
address = self.__getaddr('FROM:', arg) if arg else None
syntaxerr = '501 Syntax: MAIL FROM: <address>'
if self.extended_smtp:
syntaxerr += ' [SP <mail-parameters>]'
if arg is None:
self.push(syntaxerr)
return
arg = self._strip_command_keyword('FROM:', arg)
address, params = self._getaddr(arg)
if not address:
self.push('501 Syntax: MAIL FROM:<address>')
self.push(syntaxerr)
return
if not self.extended_smtp and params:
self.push(syntaxerr)
return
if not address:
self.push(syntaxerr)
return
if self.mailfrom:
self.push('503 Error: nested MAIL command')
return
params = self._getparams(params.upper())
if params is None:
self.push(syntaxerr)
return
size = params.pop('SIZE', None)
if size:
if not size.isdigit():
self.push(syntaxerr)
return
elif self.data_size_limit and int(size) > self.data_size_limit:
self.push('552 Error: message size exceeds fixed maximum message size')
return
if len(params.keys()) > 0:
self.push('555 MAIL FROM parameters not recognized or not implemented')
return
self.mailfrom = address
print('sender:', self.mailfrom, file=DEBUGSTREAM)
self.push('250 Ok')
self.push('250 OK')
def smtp_RCPT(self, arg):
if not self.seen_greeting:
self.push('503 Error: send HELO first');
return
print('===> RCPT', arg, file=DEBUGSTREAM)
if not self.mailfrom:
self.push('503 Error: need MAIL command')
return
address = self.__getaddr('TO:', arg) if arg else None
syntaxerr = '501 Syntax: RCPT TO: <address>'
if self.extended_smtp:
syntaxerr += ' [SP <mail-parameters>]'
if arg is None:
self.push(syntaxerr)
return
arg = self._strip_command_keyword('TO:', arg)
address, params = self._getaddr(arg)
if not address:
self.push(syntaxerr)
return
if params:
if self.extended_smtp:
params = self._getparams(params.upper())
if params is None:
self.push(syntaxerr)
return
else:
self.push(syntaxerr)
return
if not address:
self.push(syntaxerr)
return
if params and len(params.keys()) > 0:
self.push('555 RCPT TO parameters not recognized or not implemented')
return
if not address:
self.push('501 Syntax: RCPT TO: <address>')
return
self.rcpttos.append(address)
print('recips:', self.rcpttos, file=DEBUGSTREAM)
self.push('250 Ok')
self.push('250 OK')
def smtp_RSET(self, arg):
if arg:
@ -416,13 +550,12 @@ class SMTPChannel(asynchat.async_chat):
self.rcpttos = []
self.received_data = ''
self.smtp_state = self.COMMAND
self.push('250 Ok')
self.push('250 OK')
def smtp_DATA(self, arg):
if not self.seen_greeting:
self.push('503 Error: send HELO first');
return
if not self.rcpttos:
self.push('503 Error: need RCPT command')
return
@ -433,15 +566,20 @@ class SMTPChannel(asynchat.async_chat):
self.set_terminator(b'\r\n.\r\n')
self.push('354 End data with <CR><LF>.<CR><LF>')
# Commands that have not been implemented
def smtp_EXPN(self, arg):
self.push('502 EXPN not implemented')
class SMTPServer(asyncore.dispatcher):
# SMTPChannel class to use for managing client connections
channel_class = SMTPChannel
def __init__(self, localaddr, remoteaddr):
def __init__(self, localaddr, remoteaddr,
data_size_limit=DATA_SIZE_DEFAULT):
self._localaddr = localaddr
self._remoteaddr = remoteaddr
self.data_size_limit = data_size_limit
asyncore.dispatcher.__init__(self)
try:
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
@ -459,7 +597,7 @@ class SMTPServer(asyncore.dispatcher):
def handle_accepted(self, conn, addr):
print('Incoming connection from %s' % repr(addr), file=DEBUGSTREAM)
channel = self.channel_class(self, conn, addr)
channel = self.channel_class(self, conn, addr, self.data_size_limit)
# API for "doing something useful with the message"
def process_message(self, peer, mailfrom, rcpttos, data):
@ -487,7 +625,6 @@ class SMTPServer(asyncore.dispatcher):
raise NotImplementedError
class DebuggingServer(SMTPServer):
# Do something with the gathered message
def process_message(self, peer, mailfrom, rcpttos, data):
@ -503,7 +640,6 @@ class DebuggingServer(SMTPServer):
print('------------ END MESSAGE ------------')
class PureProxy(SMTPServer):
def process_message(self, peer, mailfrom, rcpttos, data):
lines = data.split('\n')
@ -544,7 +680,6 @@ class PureProxy(SMTPServer):
return refused
class MailmanProxy(PureProxy):
def process_message(self, peer, mailfrom, rcpttos, data):
from io import StringIO
@ -623,19 +758,18 @@ class MailmanProxy(PureProxy):
msg.Enqueue(mlist, torequest=1)
class Options:
setuid = 1
classname = 'PureProxy'
size_limit = None
def parseargs():
global DEBUGSTREAM
try:
opts, args = getopt.getopt(
sys.argv[1:], 'nVhc:d',
['class=', 'nosetuid', 'version', 'help', 'debug'])
sys.argv[1:], 'nVhc:s:d',
['class=', 'nosetuid', 'version', 'help', 'size=', 'debug'])
except getopt.error as e:
usage(1, e)
@ -652,6 +786,13 @@ def parseargs():
options.classname = arg
elif opt in ('-d', '--debug'):
DEBUGSTREAM = sys.stderr
elif opt in ('-s', '--size'):
try:
int_size = int(arg)
options.size_limit = int_size
except:
print('Invalid size: ' + arg, file=sys.stderr)
sys.exit(1)
# parse the rest of the arguments
if len(args) < 1:
@ -686,7 +827,6 @@ def parseargs():
return options
if __name__ == '__main__':
options = parseargs()
# Become nobody
@ -699,7 +839,8 @@ if __name__ == '__main__':
import __main__ as mod
class_ = getattr(mod, classname)
proxy = class_((options.localhost, options.localport),
(options.remotehost, options.remoteport))
(options.remotehost, options.remoteport),
options.size_limit)
if options.setuid:
try:
import pwd

3
Lib/test/test_logging.py
View File

@ -663,6 +663,7 @@ if threading:
self.smtp_server = server
self.conn = conn
self.addr = addr
self.data_size_limit = None
self.received_lines = []
self.smtp_state = self.COMMAND
self.seen_greeting = ''
@ -682,6 +683,7 @@ if threading:
return
self.push('220 %s %s' % (self.fqdn, smtpd.__version__))
self.set_terminator(b'\r\n')
self.extended_smtp = False
class TestSMTPServer(smtpd.SMTPServer):
@ -709,6 +711,7 @@ if threading:
def __init__(self, addr, handler, poll_interval, sockmap):
self._localaddr = addr
self._remoteaddr = None
self.data_size_limit = None
self.sockmap = sockmap
asyncore.dispatcher.__init__(self, map=sockmap)
try:

274
Lib/test/test_smtpd.py
View File

@ -1,4 +1,4 @@
from unittest import TestCase
import unittest
from test import support, mock_socket
import socket
import io
@ -26,7 +26,7 @@ class BrokenDummyServer(DummyServer):
raise DummyDispatcherBroken()
class SMTPDServerTest(TestCase):
class SMTPDServerTest(unittest.TestCase):
def setUp(self):
smtpd.socket = asyncore.socket = mock_socket
@ -39,7 +39,7 @@ class SMTPDServerTest(TestCase):
channel.socket.queue_recv(line)
channel.handle_read()
write_line(b'HELO test.example')
write_line(b'HELO example')
write_line(b'MAIL From:eggs@example')
write_line(b'RCPT To:spam@example')
write_line(b'DATA')
@ -50,7 +50,7 @@ class SMTPDServerTest(TestCase):
asyncore.socket = smtpd.socket = socket
class SMTPDChannelTest(TestCase):
class SMTPDChannelTest(unittest.TestCase):
def setUp(self):
smtpd.socket = asyncore.socket = mock_socket
self.old_debugstream = smtpd.DEBUGSTREAM
@ -79,36 +79,94 @@ class SMTPDChannelTest(TestCase):
self.assertEqual(self.channel.socket.last,
b'500 Error: bad syntax\r\n')
def test_EHLO_not_implemented(self):
self.write_line(b'EHLO test.example')
def test_EHLO(self):
self.write_line(b'EHLO example')
self.assertEqual(self.channel.socket.last, b'250 HELP\r\n')
def test_EHLO_bad_syntax(self):
self.write_line(b'EHLO')
self.assertEqual(self.channel.socket.last,
b'502 Error: command "EHLO" not implemented\r\n')
b'501 Syntax: EHLO hostname\r\n')
def test_EHLO_duplicate(self):
self.write_line(b'EHLO example')
self.write_line(b'EHLO example')
self.assertEqual(self.channel.socket.last,
b'503 Duplicate HELO/EHLO\r\n')
def test_EHLO_HELO_duplicate(self):
self.write_line(b'EHLO example')
self.write_line(b'HELO example')
self.assertEqual(self.channel.socket.last,
b'503 Duplicate HELO/EHLO\r\n')
def test_HELO(self):
name = smtpd.socket.getfqdn()
self.write_line(b'HELO test.example')
self.write_line(b'HELO example')
self.assertEqual(self.channel.socket.last,
'250 {}\r\n'.format(name).encode('ascii'))
def test_HELO_EHLO_duplicate(self):
self.write_line(b'HELO example')
self.write_line(b'EHLO example')
self.assertEqual(self.channel.socket.last,
b'503 Duplicate HELO/EHLO\r\n')
def test_HELP(self):
self.write_line(b'HELP')
self.assertEqual(self.channel.socket.last,
b'250 Supported commands: EHLO HELO MAIL RCPT ' + \
b'DATA RSET NOOP QUIT VRFY\r\n')
def test_HELP_command(self):
self.write_line(b'HELP MAIL')
self.assertEqual(self.channel.socket.last,
b'250 Syntax: MAIL FROM: <address>\r\n')
def test_HELP_command_unknown(self):
self.write_line(b'HELP SPAM')
self.assertEqual(self.channel.socket.last,
b'501 Supported commands: EHLO HELO MAIL RCPT ' + \
b'DATA RSET NOOP QUIT VRFY\r\n')
def test_HELO_bad_syntax(self):
self.write_line(b'HELO')
self.assertEqual(self.channel.socket.last,
b'501 Syntax: HELO hostname\r\n')
def test_HELO_duplicate(self):
self.write_line(b'HELO test.example')
self.write_line(b'HELO test.example')
self.write_line(b'HELO example')
self.write_line(b'HELO example')
self.assertEqual(self.channel.socket.last,
b'503 Duplicate HELO/EHLO\r\n')
def test_HELO_parameter_rejected_when_extensions_not_enabled(self):
self.extended_smtp = False
self.write_line(b'HELO example')
self.write_line(b'MAIL from:<foo@example.com> SIZE=1234')
self.assertEqual(self.channel.socket.last,
b'501 Syntax: MAIL FROM: <address>\r\n')
def test_MAIL_allows_space_after_colon(self):
self.write_line(b'HELO example')
self.write_line(b'MAIL from: <foo@example.com>')
self.assertEqual(self.channel.socket.last,
b'250 OK\r\n')
def test_extended_MAIL_allows_space_after_colon(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL from: <foo@example.com> size=20')
self.assertEqual(self.channel.socket.last,
b'250 OK\r\n')
def test_NOOP(self):
self.write_line(b'NOOP')
self.assertEqual(self.channel.socket.last, b'250 Ok\r\n')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
def test_HELO_NOOP(self):
self.write_line(b'HELO example')
self.write_line(b'NOOP')
self.assertEqual(self.channel.socket.last, b'250 Ok\r\n')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
def test_NOOP_bad_syntax(self):
self.write_line(b'NOOP hi')
@ -136,15 +194,29 @@ class SMTPDChannelTest(TestCase):
def test_command_too_long(self):
self.write_line(b'HELO example')
self.write_line(b'MAIL from ' +
self.write_line(b'MAIL from: ' +
b'a' * self.channel.command_size_limit +
b'@example')
self.assertEqual(self.channel.socket.last,
b'500 Error: line too long\r\n')
def test_data_too_long(self):
# Small hack. Setting limit to 2K octets here will save us some time.
self.channel.data_size_limit = 2048
def test_MAIL_command_limit_extended_with_SIZE(self):
self.write_line(b'EHLO example')
fill_len = self.channel.command_size_limit - len('MAIL from:<@example>')
self.write_line(b'MAIL from:<' +
b'a' * fill_len +
b'@example> SIZE=1234')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.write_line(b'MAIL from:<' +
b'a' * (fill_len + 26) +
b'@example> SIZE=1234')
self.assertEqual(self.channel.socket.last,
b'500 Error: line too long\r\n')
def test_data_longer_than_default_data_size_limit(self):
# Hack the default so we don't have to generate so much data.
self.channel.data_size_limit = 1048
self.write_line(b'HELO example')
self.write_line(b'MAIL From:eggs@example')
self.write_line(b'RCPT To:spam@example')
@ -154,19 +226,55 @@ class SMTPDChannelTest(TestCase):
self.assertEqual(self.channel.socket.last,
b'552 Error: Too much mail data\r\n')
def test_MAIL_size_parameter(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL FROM:<eggs@example> SIZE=512')
self.assertEqual(self.channel.socket.last,
b'250 OK\r\n')
def test_MAIL_invalid_size_parameter(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL FROM:<eggs@example> SIZE=invalid')
self.assertEqual(self.channel.socket.last,
b'501 Syntax: MAIL FROM: <address> [SP <mail-parameters>]\r\n')
def test_MAIL_RCPT_unknown_parameters(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL FROM:<eggs@example> ham=green')
self.assertEqual(self.channel.socket.last,
b'555 MAIL FROM parameters not recognized or not implemented\r\n')
self.write_line(b'MAIL FROM:<eggs@example>')
self.write_line(b'RCPT TO:<eggs@example> ham=green')
self.assertEqual(self.channel.socket.last,
b'555 RCPT TO parameters not recognized or not implemented\r\n')
def test_MAIL_size_parameter_larger_than_default_data_size_limit(self):
self.channel.data_size_limit = 1048
self.write_line(b'EHLO example')
self.write_line(b'MAIL FROM:<eggs@example> SIZE=2096')
self.assertEqual(self.channel.socket.last,
b'552 Error: message size exceeds fixed maximum message size\r\n')
def test_need_MAIL(self):
self.write_line(b'HELO example')
self.write_line(b'RCPT to:spam@example')
self.assertEqual(self.channel.socket.last,
b'503 Error: need MAIL command\r\n')
def test_MAIL_syntax(self):
def test_MAIL_syntax_HELO(self):
self.write_line(b'HELO example')
self.write_line(b'MAIL from eggs@example')
self.assertEqual(self.channel.socket.last,
b'501 Syntax: MAIL FROM: <address>\r\n')
def test_MAIL_missing_from(self):
def test_MAIL_syntax_EHLO(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL from eggs@example')
self.assertEqual(self.channel.socket.last,
b'501 Syntax: MAIL FROM: <address> [SP <mail-parameters>]\r\n')
def test_MAIL_missing_address(self):
self.write_line(b'HELO example')
self.write_line(b'MAIL from:')
self.assertEqual(self.channel.socket.last,
@ -175,7 +283,36 @@ class SMTPDChannelTest(TestCase):
def test_MAIL_chevrons(self):
self.write_line(b'HELO example')
self.write_line(b'MAIL from:<eggs@example>')
self.assertEqual(self.channel.socket.last, b'250 Ok\r\n')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
def test_MAIL_empty_chevrons(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL from:<>')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
def test_MAIL_quoted_localpart(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL from: <"Fred Blogs"@example.com>')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.assertEqual(self.channel.mailfrom, '"Fred Blogs"@example.com')
def test_MAIL_quoted_localpart_no_angles(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL from: "Fred Blogs"@example.com')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.assertEqual(self.channel.mailfrom, '"Fred Blogs"@example.com')
def test_MAIL_quoted_localpart_with_size(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL from: <"Fred Blogs"@example.com> SIZE=1000')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.assertEqual(self.channel.mailfrom, '"Fred Blogs"@example.com')
def test_MAIL_quoted_localpart_with_size_no_angles(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL from: "Fred Blogs"@example.com SIZE=1000')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.assertEqual(self.channel.mailfrom, '"Fred Blogs"@example.com')
def test_nested_MAIL(self):
self.write_line(b'HELO example')
@ -184,6 +321,22 @@ class SMTPDChannelTest(TestCase):
self.assertEqual(self.channel.socket.last,
b'503 Error: nested MAIL command\r\n')
def test_VRFY(self):
self.write_line(b'VRFY eggs@example')
self.assertEqual(self.channel.socket.last,
b'252 Cannot VRFY user, but will accept message and attempt ' + \
b'delivery\r\n')
def test_VRFY_syntax(self):
self.write_line(b'VRFY')
self.assertEqual(self.channel.socket.last,
b'501 Syntax: VRFY <address>\r\n')
def test_EXPN_not_implemented(self):
self.write_line(b'EXPN')
self.assertEqual(self.channel.socket.last,
b'502 EXPN not implemented\r\n')
def test_no_HELO_MAIL(self):
self.write_line(b'MAIL from:<foo@example.com>')
self.assertEqual(self.channel.socket.last,
@ -196,13 +349,26 @@ class SMTPDChannelTest(TestCase):
self.assertEqual(self.channel.socket.last,
b'503 Error: need RCPT command\r\n')
def test_RCPT_syntax(self):
def test_RCPT_syntax_HELO(self):
self.write_line(b'HELO example')
self.write_line(b'MAIL From: eggs@example')
self.write_line(b'RCPT to eggs@example')
self.assertEqual(self.channel.socket.last,
b'501 Syntax: RCPT TO: <address>\r\n')
def test_RCPT_syntax_EHLO(self):
self.write_line(b'EHLO example')
self.write_line(b'MAIL From: eggs@example')
self.write_line(b'RCPT to eggs@example')
self.assertEqual(self.channel.socket.last,
b'501 Syntax: RCPT TO: <address> [SP <mail-parameters>]\r\n')
def test_RCPT_lowercase_to_OK(self):
self.write_line(b'HELO example')
self.write_line(b'MAIL From: eggs@example')
self.write_line(b'RCPT to: <eggs@example>')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
def test_no_HELO_RCPT(self):
self.write_line(b'RCPT to eggs@example')
self.assertEqual(self.channel.socket.last,
@ -211,15 +377,15 @@ class SMTPDChannelTest(TestCase):
def test_data_dialog(self):
self.write_line(b'HELO example')
self.write_line(b'MAIL From:eggs@example')
self.assertEqual(self.channel.socket.last, b'250 Ok\r\n')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.write_line(b'RCPT To:spam@example')
self.assertEqual(self.channel.socket.last, b'250 Ok\r\n')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.write_line(b'DATA')
self.assertEqual(self.channel.socket.last,
b'354 End data with <CR><LF>.<CR><LF>\r\n')
self.write_line(b'data\r\nmore\r\n.')
self.assertEqual(self.channel.socket.last, b'250 Ok\r\n')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.assertEqual(self.server.messages,
[('peer', 'eggs@example', ['spam@example'], 'data\nmore')])
@ -267,7 +433,7 @@ class SMTPDChannelTest(TestCase):
self.write_line(b'MAIL From:eggs@example')
self.write_line(b'RCPT To:spam@example')
self.write_line(b'RSET')
self.assertEqual(self.channel.socket.last, b'250 Ok\r\n')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.write_line(b'MAIL From:foo@example')
self.write_line(b'RCPT To:eggs@example')
self.write_line(b'DATA')
@ -278,12 +444,18 @@ class SMTPDChannelTest(TestCase):
def test_HELO_RSET(self):
self.write_line(b'HELO example')
self.write_line(b'RSET')
self.assertEqual(self.channel.socket.last, b'250 Ok\r\n')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
def test_RSET_syntax(self):
self.write_line(b'RSET hi')
self.assertEqual(self.channel.socket.last, b'501 Syntax: RSET\r\n')
def test_unknown_command(self):
self.write_line(b'UNKNOWN_CMD')
self.assertEqual(self.channel.socket.last,
b'500 Error: command "UNKNOWN_CMD" not ' + \
b'recognized\r\n')
def test_attribute_deprecations(self):
with support.check_warnings(('', DeprecationWarning)):
spam = self.channel._SMTPChannel__server
@ -330,8 +502,54 @@ class SMTPDChannelTest(TestCase):
with support.check_warnings(('', DeprecationWarning)):
self.channel._SMTPChannel__addr = 'spam'
def test_main():
support.run_unittest(SMTPDServerTest, SMTPDChannelTest)
class SMTPDChannelWithDataSizeLimitTest(unittest.TestCase):
def setUp(self):
smtpd.socket = asyncore.socket = mock_socket
self.debug = smtpd.DEBUGSTREAM = io.StringIO()
self.server = DummyServer('a', 'b')
conn, addr = self.server.accept()
# Set DATA size limit to 32 bytes for easy testing
self.channel = smtpd.SMTPChannel(self.server, conn, addr, 32)
def tearDown(self):
asyncore.close_all()
asyncore.socket = smtpd.socket = socket
def write_line(self, line):
self.channel.socket.queue_recv(line)
self.channel.handle_read()
def test_data_limit_dialog(self):
self.write_line(b'HELO example')
self.write_line(b'MAIL From:eggs@example')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.write_line(b'RCPT To:spam@example')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.write_line(b'DATA')
self.assertEqual(self.channel.socket.last,
b'354 End data with <CR><LF>.<CR><LF>\r\n')
self.write_line(b'data\r\nmore\r\n.')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.assertEqual(self.server.messages,
[('peer', 'eggs@example', ['spam@example'], 'data\nmore')])
def test_data_limit_dialog_too_much_data(self):
self.write_line(b'HELO example')
self.write_line(b'MAIL From:eggs@example')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.write_line(b'RCPT To:spam@example')
self.assertEqual(self.channel.socket.last, b'250 OK\r\n')
self.write_line(b'DATA')
self.assertEqual(self.channel.socket.last,
b'354 End data with <CR><LF>.<CR><LF>\r\n')
self.write_line(b'This message is longer than 32 bytes\r\n.')
self.assertEqual(self.channel.socket.last,
b'552 Error: Too much mail data\r\n')
if __name__ == "__main__":
test_main()
unittest.main()

21
Lib/test/test_smtplib.py
View File

@ -229,13 +229,13 @@ class DebuggingServerTests(unittest.TestCase):
def testNOOP(self):
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
expected = (250, b'Ok')
expected = (250, b'OK')
self.assertEqual(smtp.noop(), expected)
smtp.quit()
def testRSET(self):
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
expected = (250, b'Ok')
expected = (250, b'OK')
self.assertEqual(smtp.rset(), expected)
smtp.quit()
@ -246,10 +246,18 @@ class DebuggingServerTests(unittest.TestCase):
self.assertEqual(smtp.ehlo(), expected)
smtp.quit()
def testVRFY(self):
# VRFY isn't implemented in DebuggingServer
def testNotImplemented(self):
# EXPN isn't implemented in DebuggingServer
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
expected = (502, b'Error: command "VRFY" not implemented')
expected = (502, b'EXPN not implemented')
smtp.putcmd('EXPN')
self.assertEqual(smtp.getreply(), expected)
smtp.quit()
def testVRFY(self):
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
expected = (252, b'Cannot VRFY user, but will accept message ' + \
b'and attempt delivery')
self.assertEqual(smtp.vrfy('nobody@nowhere.com'), expected)
self.assertEqual(smtp.verify('nobody@nowhere.com'), expected)
smtp.quit()
@ -265,7 +273,8 @@ class DebuggingServerTests(unittest.TestCase):
def testHELP(self):
smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
self.assertEqual(smtp.help(), b'Error: command "HELP" not implemented')
self.assertEqual(smtp.help(), b'Supported commands: EHLO HELO MAIL ' + \
b'RCPT DATA RSET NOOP QUIT VRFY')
smtp.quit()
def testSend(self):

3
Misc/ACKS
View File

@ -112,6 +112,7 @@ Gregory Bond
Matias Bordese
Jurjen Bos
Peter Bosch
Dan Boswell
Eric Bouck
Thierry Bousch
Sebastian Boving
@ -494,6 +495,7 @@ Geert Jansen
Jack Jansen
Bill Janssen
Thomas Jarosch
Juhana Jauhiainen
Zbigniew Jędrzejewski-Szmek
Julien Jehannet
Drew Jenkins
@ -1039,6 +1041,7 @@ Sandro Tosi
Richard Townsend
David Townshend
Laurence Tratt
Alberto Trevino
Matthias Troffaes
John Tromp
Jason Trowbridge

3
Misc/NEWS
View File

@ -46,6 +46,9 @@ Core and Builtins
Library
-------
- Issue #8739: Updated smtpd to support RFC 5321, and added support for the
RFC 1870 SIZE extension.
- Issue #665194: Added a localtime function to email.utils to provide an
aware local datetime for use in setting Date headers.