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Diffstat (limited to 'modules/language/python/module/smtpd.py')
| -rwxr-xr-x | modules/language/python/module/smtpd.py | 967 |
1 files changed, 967 insertions, 0 deletions
diff --git a/modules/language/python/module/smtpd.py b/modules/language/python/module/smtpd.py new file mode 100755 index 0000000..fbbf7ac --- /dev/null +++ b/modules/language/python/module/smtpd.py @@ -0,0 +1,967 @@ +module(smtpd) + +#! /usr/bin/python3.6 +"""An RFC 5321 smtp proxy with optional RFC 1870 and RFC 6531 extensions. + +Usage: %(program)s [options] [localhost:localport [remotehost:remoteport]] + +Options: + + --nosetuid + -n + This program generally tries to setuid `nobody', unless this flag is + set. The setuid call will fail if this program is not run as root (in + which case, use this flag). + + --version + -V + Print the version number and exit. + + --class classname + -c classname + 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. + + --smtputf8 + -u + Enable the SMTPUTF8 extension and behave as an RFC 6531 smtp proxy. + + --debug + -d + Turn on debugging prints. + + --help + -h + Print this message and exit. + +Version: %(__version__)s + +If localhost is not given then `localhost' is used, and if localport is not +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 5321. It +# has a hierarchy of classes which implement the backend functionality for the +# smtpd. A number of classes are provided: +# +# SMTPServer - the base class for the backend. Raises NotImplementedError +# if you try to use it. +# +# DebuggingServer - simply prints each message it receives on stdout. +# +# PureProxy - Proxies all messages to a real smtpd which does final +# delivery. One known problem with this class is that it doesn't handle +# SMTP errors from the backend server at all. This should be fixed +# (contributions are welcome!). +# +# MailmanProxy - An experimental hack to work with GNU Mailman +# <www.list.org>. Using this server as your real incoming smtpd, your +# mailhost will automatically recognize and accept mail destined to Mailman +# lists when those lists are created. Every message not destined for a list +# gets forwarded to a real backend smtpd, as with PureProxy. Again, errors +# are not handled correctly yet. +# +# +# Author: Barry Warsaw <barry@python.org> +# +# TODO: +# +# - support mailbox delivery +# - alias files +# - Handle more ESMTP extensions +# - handle error codes from the backend smtpd + +import sys +import os +import errno +import getopt +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__ = [ + "SMTPChannel", "SMTPServer", "DebuggingServer", "PureProxy", + "MailmanProxy", +] + +program = sys.argv[0] +__version__ = 'Python SMTP proxy version 0.3' + + +class Devnull: + def write(self, msg): pass + def flush(self): pass + + +DEBUGSTREAM = Devnull() +NEWLINE = '\n' +COMMASPACE = ', ' +DATA_SIZE_DEFAULT = 33554432 + + +def usage(code, msg=''): + print(__doc__ % globals(), file=sys.stderr) + if msg: + print(msg, file=sys.stderr) + sys.exit(code) + + +class SMTPChannel(asynchat.async_chat): + COMMAND = 0 + DATA = 1 + + command_size_limit = 512 + command_size_limits = collections.defaultdict(lambda x=command_size_limit: x) + + @property + def max_command_size_limit(self): + try: + return max(self.command_size_limits.values()) + except ValueError: + return self.command_size_limit + + def __init__(self, server, conn, addr, data_size_limit=DATA_SIZE_DEFAULT, + map=None, enable_SMTPUTF8=False, decode_data=False): + asynchat.async_chat.__init__(self, conn, map=map) + self.smtp_server = server + self.conn = conn + self.addr = addr + self.data_size_limit = data_size_limit + self.enable_SMTPUTF8 = enable_SMTPUTF8 + self._decode_data = decode_data + if enable_SMTPUTF8 and decode_data: + raise ValueError("decode_data and enable_SMTPUTF8 cannot" + " be set to True at the same time") + if decode_data: + self._emptystring = '' + self._linesep = '\r\n' + self._dotsep = '.' + self._newline = NEWLINE + else: + self._emptystring = b'' + self._linesep = b'\r\n' + self._dotsep = ord(b'.') + self._newline = b'\n' + self._set_rset_state() + self.seen_greeting = '' + self.extended_smtp = False + self.command_size_limits.clear() + self.fqdn = socket.getfqdn() + try: + self.peer = conn.getpeername() + except OSError as err: + # a race condition may occur if the other end is closing + # before we can get the peername + self.close() + if err.args[0] != errno.ENOTCONN: + raise + return + print('Peer:', repr(self.peer), file=DEBUGSTREAM) + self.push('220 %s %s' % (self.fqdn, __version__)) + + def _set_post_data_state(self): + """Reset state variables to their post-DATA state.""" + self.smtp_state = self.COMMAND + self.mailfrom = None + self.rcpttos = [] + self.require_SMTPUTF8 = False + self.num_bytes = 0 + self.set_terminator(b'\r\n') + + def _set_rset_state(self): + """Reset all state variables except the greeting.""" + self._set_post_data_state() + self.received_data = '' + self.received_lines = [] + + + # properties for backwards-compatibility + @property + def __server(self): + warn("Access to __server attribute on SMTPChannel is deprecated, " + "use 'smtp_server' instead", DeprecationWarning, 2) + return self.smtp_server + @__server.setter + def __server(self, value): + warn("Setting __server attribute on SMTPChannel is deprecated, " + "set 'smtp_server' instead", DeprecationWarning, 2) + self.smtp_server = value + + @property + def __line(self): + warn("Access to __line attribute on SMTPChannel is deprecated, " + "use 'received_lines' instead", DeprecationWarning, 2) + return self.received_lines + @__line.setter + def __line(self, value): + warn("Setting __line attribute on SMTPChannel is deprecated, " + "set 'received_lines' instead", DeprecationWarning, 2) + self.received_lines = value + + @property + def __state(self): + warn("Access to __state attribute on SMTPChannel is deprecated, " + "use 'smtp_state' instead", DeprecationWarning, 2) + return self.smtp_state + @__state.setter + def __state(self, value): + warn("Setting __state attribute on SMTPChannel is deprecated, " + "set 'smtp_state' instead", DeprecationWarning, 2) + self.smtp_state = value + + @property + def __greeting(self): + warn("Access to __greeting attribute on SMTPChannel is deprecated, " + "use 'seen_greeting' instead", DeprecationWarning, 2) + return self.seen_greeting + @__greeting.setter + def __greeting(self, value): + warn("Setting __greeting attribute on SMTPChannel is deprecated, " + "set 'seen_greeting' instead", DeprecationWarning, 2) + self.seen_greeting = value + + @property + def __mailfrom(self): + warn("Access to __mailfrom attribute on SMTPChannel is deprecated, " + "use 'mailfrom' instead", DeprecationWarning, 2) + return self.mailfrom + @__mailfrom.setter + def __mailfrom(self, value): + warn("Setting __mailfrom attribute on SMTPChannel is deprecated, " + "set 'mailfrom' instead", DeprecationWarning, 2) + self.mailfrom = value + + @property + def __rcpttos(self): + warn("Access to __rcpttos attribute on SMTPChannel is deprecated, " + "use 'rcpttos' instead", DeprecationWarning, 2) + return self.rcpttos + @__rcpttos.setter + def __rcpttos(self, value): + warn("Setting __rcpttos attribute on SMTPChannel is deprecated, " + "set 'rcpttos' instead", DeprecationWarning, 2) + self.rcpttos = value + + @property + def __data(self): + warn("Access to __data attribute on SMTPChannel is deprecated, " + "use 'received_data' instead", DeprecationWarning, 2) + return self.received_data + @__data.setter + def __data(self, value): + warn("Setting __data attribute on SMTPChannel is deprecated, " + "set 'received_data' instead", DeprecationWarning, 2) + self.received_data = value + + @property + def __fqdn(self): + warn("Access to __fqdn attribute on SMTPChannel is deprecated, " + "use 'fqdn' instead", DeprecationWarning, 2) + return self.fqdn + @__fqdn.setter + def __fqdn(self, value): + warn("Setting __fqdn attribute on SMTPChannel is deprecated, " + "set 'fqdn' instead", DeprecationWarning, 2) + self.fqdn = value + + @property + def __peer(self): + warn("Access to __peer attribute on SMTPChannel is deprecated, " + "use 'peer' instead", DeprecationWarning, 2) + return self.peer + @__peer.setter + def __peer(self, value): + warn("Setting __peer attribute on SMTPChannel is deprecated, " + "set 'peer' instead", DeprecationWarning, 2) + self.peer = value + + @property + def __conn(self): + warn("Access to __conn attribute on SMTPChannel is deprecated, " + "use 'conn' instead", DeprecationWarning, 2) + return self.conn + @__conn.setter + def __conn(self, value): + warn("Setting __conn attribute on SMTPChannel is deprecated, " + "set 'conn' instead", DeprecationWarning, 2) + self.conn = value + + @property + def __addr(self): + warn("Access to __addr attribute on SMTPChannel is deprecated, " + "use 'addr' instead", DeprecationWarning, 2) + return self.addr + @__addr.setter + def __addr(self, value): + warn("Setting __addr attribute on SMTPChannel is deprecated, " + "set 'addr' instead", DeprecationWarning, 2) + self.addr = value + + # Overrides base class for convenience. + def push(self, msg): + asynchat.async_chat.push(self, bytes( + msg + '\r\n', 'utf-8' if self.require_SMTPUTF8 else 'ascii')) + + # Implementation of base class abstract method + def collect_incoming_data(self, data): + limit = None + if self.smtp_state == self.COMMAND: + limit = self.max_command_size_limit + elif self.smtp_state == self.DATA: + limit = self.data_size_limit + if limit and self.num_bytes > limit: + return + elif limit: + self.num_bytes += len(data) + if self._decode_data: + self.received_lines.append(str(data, 'utf-8')) + else: + self.received_lines.append(data) + + # Implementation of base class abstract method + def found_terminator(self): + line = self._emptystring.join(self.received_lines) + print('Data:', repr(line), file=DEBUGSTREAM) + self.received_lines = [] + if self.smtp_state == self.COMMAND: + sz, self.num_bytes = self.num_bytes, 0 + if not line: + self.push('500 Error: bad syntax') + return + if not self._decode_data: + line = str(line, 'utf-8') + i = line.find(' ') + if i < 0: + command = line.upper() + arg = None + 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('500 Error: command "%s" not recognized' % command) + return + method(arg) + return + else: + if self.smtp_state != self.DATA: + self.push('451 Internal confusion') + self.num_bytes = 0 + return + 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 5321, Section 4.5.2. + data = [] + for text in line.split(self._linesep): + if text and text[0] == self._dotsep: + data.append(text[1:]) + else: + data.append(text) + self.received_data = self._newline.join(data) + args = (self.peer, self.mailfrom, self.rcpttos, self.received_data) + kwargs = {} + if not self._decode_data: + kwargs = { + 'mail_options': self.mail_options, + 'rcpt_options': self.rcpt_options, + } + status = self.smtp_server.process_message(*args, **kwargs) + self._set_post_data_state() + if not status: + self.push('250 OK') + else: + self.push(status) + + # SMTP and ESMTP commands + def smtp_HELO(self, arg): + if not arg: + self.push('501 Syntax: HELO hostname') + return + # See issue #21783 for a discussion of this behavior. + if self.seen_greeting: + self.push('503 Duplicate HELO/EHLO') + return + self._set_rset_state() + self.seen_greeting = arg + self.push('250 %s' % self.fqdn) + + def smtp_EHLO(self, arg): + if not arg: + self.push('501 Syntax: EHLO hostname') + return + # See issue #21783 for a discussion of this behavior. + if self.seen_greeting: + self.push('503 Duplicate HELO/EHLO') + return + self._set_rset_state() + 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.command_size_limits['MAIL'] += 26 + if not self._decode_data: + self.push('250-8BITMIME') + if self.enable_SMTPUTF8: + self.push('250-SMTPUTF8') + self.command_size_limits['MAIL'] += 10 + self.push('250 HELP') + + def smtp_NOOP(self, arg): + if arg: + self.push('501 Syntax: NOOP') + else: + self.push('250 OK') + + def smtp_QUIT(self, arg): + # args is ignored + self.push('221 Bye') + self.close_when_done() + + def _strip_command_keyword(self, keyword, arg): + keylen = len(keyword) + if arg[:keylen].upper() == keyword: + 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: + return address, rest + return address.addr_spec, rest + + def _getparams(self, params): + # Return params as dictionary. Return None if not all parameters + # appear to be syntactically valid according to RFC 1869. + result = {} + for param in params: + param, eq, value = param.partition('=') + if not param.isalnum() or eq and not value: + return None + result[param] = value if eq else True + return result + + 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) + 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(syntaxerr) + return + if not self.extended_smtp and params: + self.push(syntaxerr) + return + if self.mailfrom: + self.push('503 Error: nested MAIL command') + return + self.mail_options = params.upper().split() + params = self._getparams(self.mail_options) + if params is None: + self.push(syntaxerr) + return + if not self._decode_data: + body = params.pop('BODY', '7BIT') + if body not in ['7BIT', '8BITMIME']: + self.push('501 Error: BODY can only be one of 7BIT, 8BITMIME') + return + if self.enable_SMTPUTF8: + smtputf8 = params.pop('SMTPUTF8', False) + if smtputf8 is True: + self.require_SMTPUTF8 = True + elif smtputf8 is not False: + self.push('501 Error: SMTPUTF8 takes no arguments') + 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') + + 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 + 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 not self.extended_smtp and params: + self.push(syntaxerr) + return + self.rcpt_options = params.upper().split() + params = self._getparams(self.rcpt_options) + if params is None: + self.push(syntaxerr) + return + # XXX currently there are no options we recognize. + if len(params.keys()) > 0: + self.push('555 RCPT TO parameters not recognized or not implemented') + return + self.rcpttos.append(address) + print('recips:', self.rcpttos, file=DEBUGSTREAM) + self.push('250 OK') + + def smtp_RSET(self, arg): + if arg: + self.push('501 Syntax: RSET') + return + self._set_rset_state() + 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 + if arg: + self.push('501 Syntax: DATA') + return + self.smtp_state = self.DATA + 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, + data_size_limit=DATA_SIZE_DEFAULT, map=None, + enable_SMTPUTF8=False, decode_data=False): + self._localaddr = localaddr + self._remoteaddr = remoteaddr + self.data_size_limit = data_size_limit + self.enable_SMTPUTF8 = enable_SMTPUTF8 + self._decode_data = decode_data + if enable_SMTPUTF8 and decode_data: + raise ValueError("decode_data and enable_SMTPUTF8 cannot" + " be set to True at the same time") + asyncore.dispatcher.__init__(self, map=map) + try: + gai_results = socket.getaddrinfo(*localaddr, + type=socket.SOCK_STREAM) + self.create_socket(gai_results[0][0], gai_results[0][1]) + # try to re-use a server port if possible + self.set_reuse_addr() + self.bind(localaddr) + self.listen(5) + except: + self.close() + raise + else: + print('%s started at %s\n\tLocal addr: %s\n\tRemote addr:%s' % ( + self.__class__.__name__, time.ctime(time.time()), + localaddr, remoteaddr), file=DEBUGSTREAM) + + def handle_accepted(self, conn, addr): + print('Incoming connection from %s' % repr(addr), file=DEBUGSTREAM) + channel = self.channel_class(self, + conn, + addr, + self.data_size_limit, + self._map, + self.enable_SMTPUTF8, + self._decode_data) + + # API for "doing something useful with the message" + def process_message(self, peer, mailfrom, rcpttos, data, **kwargs): + """Override this abstract method to handle messages from the client. + + peer is a tuple containing (ipaddr, port) of the client that made the + socket connection to our smtp port. + + mailfrom is the raw address the client claims the message is coming + from. + + rcpttos is a list of raw addresses the client wishes to deliver the + message to. + + data is a string containing the entire full text of the message, + headers (if supplied) and all. It has been `de-transparencied' + according to RFC 821, Section 4.5.2. In other words, a line + containing a `.' followed by other text has had the leading dot + removed. + + kwargs is a dictionary containing additional information. It is + empty if decode_data=True was given as init parameter, otherwise + it will contain the following keys: + 'mail_options': list of parameters to the mail command. All + elements are uppercase strings. Example: + ['BODY=8BITMIME', 'SMTPUTF8']. + 'rcpt_options': same, for the rcpt command. + + This function should return None for a normal `250 Ok' response; + otherwise, it should return the desired response string in RFC 821 + format. + + """ + raise NotImplementedError + + +class DebuggingServer(SMTPServer): + + def _print_message_content(self, peer, data): + inheaders = 1 + lines = data.splitlines() + for line in lines: + # headers first + if inheaders and not line: + peerheader = 'X-Peer: ' + peer[0] + if not isinstance(data, str): + # decoded_data=false; make header match other binary output + peerheader = repr(peerheader.encode('utf-8')) + print(peerheader) + inheaders = 0 + if not isinstance(data, str): + # Avoid spurious 'str on bytes instance' warning. + line = repr(line) + print(line) + + def process_message(self, peer, mailfrom, rcpttos, data, **kwargs): + print('---------- MESSAGE FOLLOWS ----------') + if kwargs: + if kwargs.get('mail_options'): + print('mail options: %s' % kwargs['mail_options']) + if kwargs.get('rcpt_options'): + print('rcpt options: %s\n' % kwargs['rcpt_options']) + self._print_message_content(peer, data) + print('------------ END MESSAGE ------------') + + +class PureProxy(SMTPServer): + def __init__(self, *args, **kwargs): + if 'enable_SMTPUTF8' in kwargs and kwargs['enable_SMTPUTF8']: + raise ValueError("PureProxy does not support SMTPUTF8.") + super(PureProxy, self).__init__(*args, **kwargs) + + def process_message(self, peer, mailfrom, rcpttos, data): + lines = data.split('\n') + # Look for the last header + i = 0 + for line in lines: + if not line: + break + i += 1 + lines.insert(i, 'X-Peer: %s' % peer[0]) + data = NEWLINE.join(lines) + refused = self._deliver(mailfrom, rcpttos, data) + # TBD: what to do with refused addresses? + print('we got some refusals:', refused, file=DEBUGSTREAM) + + def _deliver(self, mailfrom, rcpttos, data): + import smtplib + refused = {} + try: + s = smtplib.SMTP() + s.connect(self._remoteaddr[0], self._remoteaddr[1]) + try: + refused = s.sendmail(mailfrom, rcpttos, data) + finally: + s.quit() + except smtplib.SMTPRecipientsRefused as e: + print('got SMTPRecipientsRefused', file=DEBUGSTREAM) + refused = e.recipients + except (OSError, smtplib.SMTPException) as e: + print('got', e.__class__, file=DEBUGSTREAM) + # All recipients were refused. If the exception had an associated + # error code, use it. Otherwise,fake it with a non-triggering + # exception code. + errcode = getattr(e, 'smtp_code', -1) + errmsg = getattr(e, 'smtp_error', 'ignore') + for r in rcpttos: + refused[r] = (errcode, errmsg) + return refused + + +class MailmanProxy(PureProxy): + def __init__(self, *args, **kwargs): + if 'enable_SMTPUTF8' in kwargs and kwargs['enable_SMTPUTF8']: + raise ValueError("MailmanProxy does not support SMTPUTF8.") + super(PureProxy, self).__init__(*args, **kwargs) + + def process_message(self, peer, mailfrom, rcpttos, data): + from io import StringIO + from Mailman import Utils + from Mailman import Message + from Mailman import MailList + # If the message is to a Mailman mailing list, then we'll invoke the + # Mailman script directly, without going through the real smtpd. + # Otherwise we'll forward it to the local proxy for disposition. + listnames = [] + for rcpt in rcpttos: + local = rcpt.lower().split('@')[0] + # We allow the following variations on the theme + # listname + # listname-admin + # listname-owner + # listname-request + # listname-join + # listname-leave + parts = local.split('-') + if len(parts) > 2: + continue + listname = parts[0] + if len(parts) == 2: + command = parts[1] + else: + command = '' + if not Utils.list_exists(listname) or command not in ( + '', 'admin', 'owner', 'request', 'join', 'leave'): + continue + listnames.append((rcpt, listname, command)) + # Remove all list recipients from rcpttos and forward what we're not + # going to take care of ourselves. Linear removal should be fine + # since we don't expect a large number of recipients. + for rcpt, listname, command in listnames: + rcpttos.remove(rcpt) + # If there's any non-list destined recipients left, + print('forwarding recips:', ' '.join(rcpttos), file=DEBUGSTREAM) + if rcpttos: + refused = self._deliver(mailfrom, rcpttos, data) + # TBD: what to do with refused addresses? + print('we got refusals:', refused, file=DEBUGSTREAM) + # Now deliver directly to the list commands + mlists = {} + s = StringIO(data) + msg = Message.Message(s) + # These headers are required for the proper execution of Mailman. All + # MTAs in existence seem to add these if the original message doesn't + # have them. + if not msg.get('from'): + msg['From'] = mailfrom + if not msg.get('date'): + msg['Date'] = time.ctime(time.time()) + for rcpt, listname, command in listnames: + print('sending message to', rcpt, file=DEBUGSTREAM) + mlist = mlists.get(listname) + if not mlist: + mlist = MailList.MailList(listname, lock=0) + mlists[listname] = mlist + # dispatch on the type of command + if command == '': + # post + msg.Enqueue(mlist, tolist=1) + elif command == 'admin': + msg.Enqueue(mlist, toadmin=1) + elif command == 'owner': + msg.Enqueue(mlist, toowner=1) + elif command == 'request': + msg.Enqueue(mlist, torequest=1) + elif command in ('join', 'leave'): + # TBD: this is a hack! + if command == 'join': + msg['Subject'] = 'subscribe' + else: + msg['Subject'] = 'unsubscribe' + msg.Enqueue(mlist, torequest=1) + + +class Options: + setuid = True + classname = 'PureProxy' + size_limit = None + enable_SMTPUTF8 = False + + +def parseargs(): + global DEBUGSTREAM + try: + opts, args = getopt.getopt( + sys.argv[1:], 'nVhc:s:du', + ['class=', 'nosetuid', 'version', 'help', 'size=', 'debug', + 'smtputf8']) + except getopt.error as e: + usage(1, e) + + options = Options() + for opt, arg in opts: + if opt in ('-h', '--help'): + usage(0) + elif opt in ('-V', '--version'): + print(__version__) + sys.exit(0) + elif opt in ('-n', '--nosetuid'): + options.setuid = False + elif opt in ('-c', '--class'): + options.classname = arg + elif opt in ('-d', '--debug'): + DEBUGSTREAM = sys.stderr + elif opt in ('-u', '--smtputf8'): + options.enable_SMTPUTF8 = True + 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: + localspec = 'localhost:8025' + remotespec = 'localhost:25' + elif len(args) < 2: + localspec = args[0] + remotespec = 'localhost:25' + elif len(args) < 3: + localspec = args[0] + remotespec = args[1] + else: + usage(1, 'Invalid arguments: %s' % COMMASPACE.join(args)) + + # split into host/port pairs + i = localspec.find(':') + if i < 0: + usage(1, 'Bad local spec: %s' % localspec) + options.localhost = localspec[:i] + try: + options.localport = int(localspec[i+1:]) + except ValueError: + usage(1, 'Bad local port: %s' % localspec) + i = remotespec.find(':') + if i < 0: + usage(1, 'Bad remote spec: %s' % remotespec) + options.remotehost = remotespec[:i] + try: + options.remoteport = int(remotespec[i+1:]) + except ValueError: + usage(1, 'Bad remote port: %s' % remotespec) + return options + + +if __name__ == '__main__': + options = parseargs() + # Become nobody + classname = options.classname + if "." in classname: + lastdot = classname.rfind(".") + mod = __import__(classname[:lastdot], globals(), locals(), [""]) + classname = classname[lastdot+1:] + else: + import __main__ as mod + class_ = getattr(mod, classname) + proxy = class_((options.localhost, options.localport), + (options.remotehost, options.remoteport), + options.size_limit, enable_SMTPUTF8=options.enable_SMTPUTF8) + if options.setuid: + try: + import pwd + except ImportError: + print('Cannot import module "pwd"; try running with -n option.', file=sys.stderr) + sys.exit(1) + nobody = pwd.getpwnam('nobody')[2] + try: + os.setuid(nobody) + except PermissionError: + print('Cannot setuid "nobody"; try running with -n option.', file=sys.stderr) + sys.exit(1) + try: + asyncore.loop() + except KeyboardInterrupt: + pass |